技术领域technical field
本发明涉及烧结烟气净化技术领域，特别涉及一种烧结烟气粉尘颗粒、二氧化硫、氮氧化物及二噁英的协同净化方法及净化系统。The invention relates to the technical field of sintering flue gas purification, in particular to a method and system for synergistic purification of sintering flue gas dust particles, sulfur dioxide, nitrogen oxides and dioxins.
背景技术Background technique
当前的烧结颗粒物净化以电除尘工艺为主，但受烧结烟气成分的影响，电除尘除尘效率较低且不稳定，造成排放绝对数值较高且不稳定甚至不达标，必须寻求一种更加高效的除尘方式。The current purification of sintering particulate matter is mainly based on the electrostatic precipitator process, but due to the influence of the composition of the sintering flue gas, the dust removal efficiency of the electrostatic precipitator is low and unstable, resulting in a high absolute value of the emission and is unstable or even substandard. It is necessary to seek a more efficient method. dust removal method.
同时，国家的环保要求越来越严格，对二氧化硫、氮氧化物、二噁英等污染物都提出了更加严格的排放限值，钢铁厂必须对旧的除尘系统进行改造，在除尘器后增加脱硫、脱硝、脱二噁英的设备。At the same time, the country's environmental protection requirements are becoming more and more stringent, and more stringent emission limits have been proposed for pollutants such as sulfur dioxide, nitrogen oxides, and dioxins. Steel plants must renovate the old dust removal system and increase Equipment for desulfurization, denitrification, and dioxin removal.
目前脱硫的主流技术为石灰-石膏湿法脱硫，以及活性焦干法脱硫。其中，湿法脱硫投资大，对设备腐蚀性大，且易造成二次污染；活性焦脱硫法设备一次性投资巨大，且设备占地面积巨大，吸附剂消耗量也高，运行成本高。At present, the mainstream technologies for desulfurization are lime-gypsum wet desulfurization and active coke dry desulfurization. Among them, wet desulfurization requires a large investment, is highly corrosive to equipment, and is easy to cause secondary pollution; activated coke desulfurization equipment has a huge one-time investment, and the equipment occupies a large area, and the consumption of adsorbent is also high, and the operating cost is high.
脱硝的主流技术为SCR选择性催化还原技术及SNCR非催化还原方法，其中，SCR需要维持烟气温度在350℃甚至更高，烧结烟气具有烟气量大，且混风后烟气温度低于150℃，若增加加热装置，将大量烟气从150℃增加到350℃，运行成本巨大；SNCR是在900～1100℃，无催化剂存在下，利用氨或氨基还原剂选择性将烟气中NOx还原为N2和H2O，反应温度过高，运行成本巨大。The mainstream technologies for denitrification are SCR selective catalytic reduction technology and SNCR non-catalytic reduction method. Among them, SCR needs to maintain the flue gas temperature at 350°C or higher, and the sintering flue gas has a large amount of flue gas, and the flue gas temperature is low after air mixing At 150°C, if a heating device is added, a large amount of flue gas will be increased from 150°C to 350°C, and the operating cost will be huge; SNCR is at 900-1100°C, in the absence of a catalyst, using ammonia or an amino reducing agent to selectively reduce the flue gas NOx is reduced to N2 and H2 O, the reaction temperature is too high, and the operation cost is huge.
脱二噁英的主流技术是在烟道内喷入吸附剂，如活性炭等，但是活性炭运行成本过高，同时吸附了二噁英的活性炭是危险废弃物，需要特殊设备处理。The mainstream technology for removing dioxins is to spray adsorbents, such as activated carbon, into the flue, but the operating cost of activated carbon is too high, and the activated carbon that has adsorbed dioxins is a hazardous waste that requires special equipment for treatment.
可见，每一项污染物的脱除都需要增加高额的投资，在目前钢铁行业低迷的严峻形势下，必须寻找一种适用于钢铁厂的多污染物协同净化的方法。It can be seen that the removal of each pollutant requires a large amount of investment. Under the severe situation of the current downturn in the steel industry, it is necessary to find a multi-pollutant collaborative purification method suitable for steel plants.
发明内容Contents of the invention
鉴于以上所述现有技术的不足，发明的目的在于提供一种烧结烟气多污染物协同净化方法及净化系统，降低处理成本，净化效率高且运行稳定，无二次污染。In view of the above-mentioned deficiencies in the prior art, the purpose of the invention is to provide a multi-pollutant synergistic purification method and purification system for sintering flue gas, which reduces treatment costs, has high purification efficiency and stable operation, and has no secondary pollution.
为实现上述目的及其他相关目的，本发明提供一种烧结烟气多污染物协同净化方法，包括以下步骤：In order to achieve the above purpose and other related purposes, the present invention provides a multi-pollutant synergistic purification method of sintering flue gas, comprising the following steps:
a、将烧结烟气按照烟气温度及污染物浓度的不同分别引入浓相主烟道及稀相主烟道，浓相主烟道内烟气温度和污染物浓度均高于稀相主烟道；a. The sintering flue gas is introduced into the dense-phase main flue and the dilute-phase main flue respectively according to the flue gas temperature and pollutant concentration. The flue gas temperature and pollutant concentration in the dense-phase main flue are higher than those in the dilute-phase main flue. ;
b、对稀相主烟道内烟气加热，并在浓相主烟道和稀相主烟道内沿烟气流动方向均依次喷入脱硫剂和脱硝剂，烟气中的二氧化硫与脱硫剂充分反应脱硫；b. Heat the flue gas in the dilute-phase main flue, and spray desulfurizer and denitrification agent in the dense-phase main flue and dilute-phase main flue along the direction of flue gas flow, and the sulfur dioxide in the flue gas will fully react with the desulfurizer Desulfurization;
c、混入脱硝剂的烟气在风机作用下流动至过滤式除尘器，烟气中的粉尘在过滤式除尘器的滤袋表面被过滤；c. The flue gas mixed with the denitrification agent flows to the filter dust collector under the action of the fan, and the dust in the flue gas is filtered on the surface of the filter bag of the filter dust collector;
d、混合了脱硝剂的氮氧化物和二噁英的烟气穿过滤袋表面覆膜进入滤袋内部，在滤袋内部催化剂的作用下，氮氧化物及二噁英被彻底分解，实现烟气脱硝及脱二噁英；d. The flue gas of nitrogen oxides and dioxins mixed with denitrification agent passes through the surface coating of the filter bag and enters the inside of the filter bag. Under the action of the catalyst inside the filter bag, the nitrogen oxides and dioxins are completely decomposed to achieve smoke Gas denitrification and dioxin removal;
f、经过滤式除尘器过滤后的洁净烟气在风机作用下，从烟囱排出。f. The clean flue gas filtered by the filter dust collector is discharged from the chimney under the action of the fan.
采用上述方法，经过加热后的烟气进入主烟道，依次流经除尘管道、与脱硫剂和脱硝剂混合，在喷射脱硫剂后的管道段，烟气中的二氧化硫与脱硫剂充分反应，实现烟气脱硫；在喷射脱硝剂后的管道段，烟气中混入脱硝剂，并在风机作用下流动至过滤式除尘器；烟气中的粉尘首先在除尘器滤袋表面实现脱除，混合了脱硝剂的氮氧化物，及二噁英的烟气穿过滤袋表面覆膜进入滤袋内部，在滤袋内部催化剂的作用下，氮氧化物及二噁英彻底催化，实现烟气脱硝及脱二噁英。最终，不含粉尘、二氧化硫、氮氧化物及二噁英的洁净烟气在风机作用下，从烟囱排出。该方法能够实现烧结烟气粉尘颗粒、二氧化硫、氮氧化物及二噁英的一次性协同净化，且加热温度不高，减少能源消耗，降低成本。其中所述过滤式除尘器内部为催化覆膜滤料，表面覆膜可对粉尘进行过滤，内部含有催化剂粉末，可催化降解氮氧化物及二噁英。Using the above method, the heated flue gas enters the main flue, flows through the dust removal pipeline in turn, and mixes with the desulfurizer and denitrification agent. In the pipeline section after the desulfurizer is sprayed, the sulfur dioxide in the flue gas fully reacts with the desulfurizer to achieve Flue gas desulfurization; in the pipeline section after the denitrification agent is injected, the flue gas is mixed with the denitrification agent, and flows to the filter dust collector under the action of the fan; the dust in the flue gas is firstly removed on the surface of the filter bag of the dust collector, and the mixed The nitrogen oxides of the denitrification agent and the flue gas of dioxins pass through the surface coating of the filter bag and enter the interior of the filter bag. Dioxins. Finally, the clean flue gas free of dust, sulfur dioxide, nitrogen oxides and dioxins is discharged from the chimney under the action of the fan. The method can realize one-time synergistic purification of sintering flue gas dust particles, sulfur dioxide, nitrogen oxides and dioxins, and the heating temperature is not high, thereby reducing energy consumption and cost. The interior of the filter type dust collector is a catalytic film-coated filter material, the surface film can filter the dust, and the interior contains catalyst powder, which can catalyze the degradation of nitrogen oxides and dioxins.
烧结机头风箱的高温烟气管道与低温烟气管道隔绝，以提高浓相主烟道内烟气温度，可以不用加热即可达到所需温度，而稀相主烟道内二噁英及氮氧化物浓度低，视情况可以采取加热或不加热的方式。The high-temperature flue gas pipe of the bellows of the sintering head is isolated from the low-temperature flue gas pipe to increase the temperature of the flue gas in the dense-phase main flue, which can reach the required temperature without heating, while the dioxin and nitrogen oxides in the dilute-phase main flue The concentration is low, depending on the situation, heating or non-heating can be adopted.
作为优选：所述步骤b中，将环冷风机出口与主烟道连通，通过环冷风机出口废气对烟气加热；或通过蒸汽管道伴热进行加热。As a preference: in the step b, the outlet of the ring cooling fan is communicated with the main flue, and the flue gas is heated through the exhaust gas at the outlet of the ring cooling fan; or the heating is carried out by tracing the heat of the steam pipe.
烧结机的环冷风机出口废气与烧结机头烟气混风升温，实现余热的利用。The exhaust gas from the outlet of the ring cooling fan of the sintering machine is mixed with the flue gas from the sintering head to heat up, so as to realize the utilization of waste heat.
作为优选：所述步骤d中，浓相主烟道上的过滤式除尘器为催化过滤式除尘器，其内部反应温度维持在150～250℃，过滤风速为0.3～0.8m/s。As a preference: in the step d, the filter dust collector on the dense phase main flue is a catalytic filter dust collector, the internal reaction temperature is maintained at 150-250°C, and the filtration wind speed is 0.3-0.8m/s.
作为优选：所述浓相主烟道内温度为200～300℃，稀相主烟道内温度为50～100℃，浓相主烟道内烟气的二噁英及氮氧化物浓度高于稀相主烟道的烟气，所述稀相主烟道位置从临近烧结机头的主烟道开始，长度占主烟道总长度的45％～55％。As a preference: the temperature in the dense-phase main flue is 200-300°C, the temperature in the dilute-phase main flue is 50-100°C, and the concentration of dioxins and nitrogen oxides in the flue gas in the dense-phase main flue is higher than that in the dilute-phase main flue. For flue gas in the flue, the position of the dilute-phase main flue starts from the main flue adjacent to the sintering machine head, and the length accounts for 45% to 55% of the total length of the main flue.
烧结烟气中生成的氮氧化物及二噁英主要集中在高温段，高温段氮氧化物及二噁英的浓度高，低温段氮氧化物及二噁英的浓度偏低。稀相主烟道、浓相主烟道完全隔断，浓相主烟道温度200～300℃，二噁英及氮氧化物浓度高，稀相主烟道温度50～100℃，二噁英及氮氧化物浓度低。The nitrogen oxides and dioxins generated in the sintering flue gas are mainly concentrated in the high temperature section, the concentration of nitrogen oxides and dioxins in the high temperature section is high, and the concentration of nitrogen oxides and dioxins in the low temperature section is low. The dilute-phase main flue and the dense-phase main flue are completely separated. The temperature of the dense-phase main flue is 200-300°C, and the concentration of dioxins and nitrogen oxides is high. The temperature of the dilute-phase main flue is 50-100°C. Low concentration of nitrogen oxides.
作为优选：所述稀相主烟道上的过滤式除尘器为配针刺毡滤料除尘器，工作温度低于110℃，过滤风速为1.0～1.1m/s；或所述稀相主烟道上的过滤式除尘器为催化过滤式除尘器。As a preference: the filter-type dust collector on the dilute-phase main flue is a dust collector equipped with needle felt filter material, the working temperature is lower than 110°C, and the filtering wind speed is 1.0-1.1m/s; or the dilute-phase main flue The special filter dust collector is a catalytic filter dust collector.
所述脱硫剂为石膏试剂、活性焦、或氨水等。石膏试剂中含5％～15％质量比的CaCO3和Ca(OH)2，活性焦吸附剂的表面积为600～2000m2/g，所述氨水浓度为20％～30％。所述脱硝剂为氨水，氨水浓度为20％～30％。The desulfurizing agent is gypsum reagent, activated coke, or ammonia water. The gypsum reagent contains 5%-15% mass ratio of CaCO3 and Ca(OH)2 , the surface area of the active coke adsorbent is 600-2000m2 /g, and the ammonia water concentration is 20%-30%. The denitration agent is ammonia water, and the concentration of ammonia water is 20%-30%.
作为优选：所述催化过滤式除尘器的滤袋为催化过滤式滤袋，包括表面覆膜和负载了催化剂粉末的内部基材；通过表面覆膜实现除尘功能，同时混合了脱硝剂的洁净烟气，可在基材表面的催化剂作用下，彻底降解二噁英及氮氧化物，所述催化剂粉末为Ti、Vi、W、Mo的氧化物粉末，按一定比例混合后粘附在基材表面；该催化剂粉末粒度为200～300目，滤袋负载量为200～300g/㎡。As a preference: the filter bag of the catalytic filter type dust collector is a catalytic filter type filter bag, including a surface coating and an internal substrate loaded with catalyst powder; the dust removal function is realized through the surface coating, and the clean smoke mixed with the denitration agent It can completely degrade dioxins and nitrogen oxides under the action of the catalyst on the surface of the substrate. The catalyst powder is the oxide powder of Ti, Vi, W, Mo, which adheres to the surface of the substrate after being mixed in a certain proportion. ; The particle size of the catalyst powder is 200-300 mesh, and the loading capacity of the filter bag is 200-300g/㎡.
本发明同时提供一种烧结烟气多污染物协同净化系统，包括烟气净化装置和烟气加热装置，所述烟气净化装置包括用于与烧结机密封连接的主烟道，主烟道上沿烟气排出方向依次设置有脱硫剂喷射装置、脱硝剂喷射装置、过滤式除尘器以及排气装置，所述烟气加热装置位于过滤式除尘器前方，对主烟道内过滤式除尘器上游的烟气进行加热。The present invention also provides a multi-pollutant synergistic purification system for sintering flue gas, which includes a flue gas purification device and a flue gas heating device. The flue gas purification device includes a main flue for sealing connection with the sintering machine. In the flue gas discharge direction, there are desulfurization agent injection devices, denitrification agent injection devices, filter dust collectors and exhaust devices in sequence. The gas is heated.
烟气经过主烟道、除尘管道、脱硫剂喷射装置、脱硝剂喷射装置，经过烟气加热装置将烟气温度加热至利于烟气催化反应的温度，然后进入过滤式除尘器，在滤袋表面实现粉尘颗粒及二氧化硫的净化，在滤袋内部实现氮氧化物及二噁英的净化，处理后的洁净烟气在排气装置作用下排出。The flue gas passes through the main flue, dust removal pipeline, desulfurizer injection device, denitrification agent injection device, and the flue gas heating device heats the flue gas to a temperature that is conducive to the catalytic reaction of the flue gas, and then enters the filter dust collector, where it is placed on the surface of the filter bag Realize the purification of dust particles and sulfur dioxide, realize the purification of nitrogen oxides and dioxins inside the filter bag, and the treated clean flue gas is discharged under the action of the exhaust device.
所述主烟道按烟气温度分为浓相主烟道、稀相主烟道，浓相主烟道和稀相主烟道相互隔开，所述浓相主烟道和稀相主烟道上均设置有脱硫剂喷射装置、脱硝剂喷射装置和过滤式除尘器，所述浓相主烟道和稀相主烟道尾端均与排气装置连接。The main flue is divided into a dense-phase main flue and a dilute-phase main flue according to the temperature of the flue gas. The dense-phase main flue and the dilute-phase main flue are separated from each other. The dense-phase main flue and the dilute-phase main flue The desulfurization agent injection device, denitrification agent injection device and filter dust collector are installed on the channel, and the tail ends of the dense phase main flue and the dilute phase main flue are connected to the exhaust device.
即过滤式除尘器分别设置浓相除尘器、稀相除尘器，并联；浓相除尘器、稀相除尘器入口管道相互独立，出口管道合用；共设1套风机、1套排气烟囱。That is, filter-type dust collectors are respectively equipped with dense-phase dust collectors and dilute-phase dust collectors, which are connected in parallel; the inlet pipes of the dense-phase dust collectors and dilute-phase dust collectors are independent of each other, and the outlet pipes are shared; a set of fans and a set of exhaust chimneys are installed.
如上所述，发明的有益效果是：As mentioned above, the beneficial effects of the invention are:
1)通过本净化系统，可对烧结烟气中的粉尘、二氧化硫、氮氧化物、二噁英等污染物协同净化，不需要增加多种设备，且可保证净化后排放的烟气氮氧化物浓度＜300mg/Nm3，二氧化硫浓度＜200mg/Nm3，二噁英浓度＜0.5ng-TEQ/Nm3，颗粒物含尘浓度≤20mg/m3，达到国家环保标准。1) Through this purification system, dust, sulfur dioxide, nitrogen oxides, dioxins and other pollutants in the sintering flue gas can be synergistically purified without adding a variety of equipment, and the flue gas nitrogen oxides after purification can be guaranteed Concentration < 300mg/Nm3 , sulfur dioxide concentration < 200mg/Nm3 , dioxin concentration < 0.5ng-TEQ/Nm3 , particle dust concentration ≤ 20mg/m3 , meeting national environmental standards.
2)本发明根据烧结烟气中氮氧化物及二噁英的分布规律，按照浓相、稀相分别控制，根据稀相烟道内污染物浓度选择普通净化方法或催化降解净化方法，有效降低一次性投资，流程更合理。2) According to the distribution law of nitrogen oxides and dioxins in the sintering flue gas, the present invention controls the dense phase and the dilute phase respectively, and selects the ordinary purification method or the catalytic degradation purification method according to the concentration of pollutants in the dilute phase flue, effectively reducing the once Sexual investment, the process is more reasonable.
3)始终喷入新鲜的脱硫剂，保证运行过程中稳定的脱硫效率；对氮氧化物及二噁英直接催化降解，无二次污染。3) Always inject fresh desulfurizer to ensure stable desulfurization efficiency during operation; directly catalyze and degrade nitrogen oxides and dioxins without secondary pollution.
4)利用混风及蒸汽伴热，维持催化过滤式除尘器在反应温度范围内，避免利用电加热手段，降低运行成本。4) Use air mixing and steam heat tracing to maintain the catalytic filter dust collector within the reaction temperature range, avoid the use of electric heating means, and reduce operating costs.
5)吸附了二氧化硫的脱硫剂可回收利用。5) The desulfurizer that has adsorbed sulfur dioxide can be recycled.
6)通过合理设计，避免了通过外加热源对烟气加热，大大降低运行成本。6) Through reasonable design, the heating of flue gas by external heating source is avoided, and the operation cost is greatly reduced.
附图说明Description of drawings
图1为本发明实施例1的结构示意图；Fig. 1 is the structural representation of embodiment 1 of the present invention;
图2为本发明实施例2的结构示意图；Fig. 2 is the structural representation of embodiment 2 of the present invention;
图3为本发明实施例3的结构示意图；Fig. 3 is the structural representation of embodiment 3 of the present invention;
图4为本发明实施例中催化过滤式除尘器的作用示意图。Fig. 4 is a schematic diagram of the function of the catalytic filter dust collector in the embodiment of the present invention.
零件标号说明Part number description
1、烧结机头；2、烧结机尾；3、风箱；41、稀相主烟道；42、浓相主烟道；5、环冷风机；52、蒸汽伴热加热装置；53、引风机；6、脱硫剂；61、62、脱硫剂喷射装置；7、脱硝剂；71、72、脱硝剂喷射装置；81、82、催化过滤式除尘器；83、过滤式除尘器；801、表面滤膜；802、基材；803、二噁英；804、粉尘颗粒；805、洁净烟气；9、主烟道；10、风机；11、烟囱。1. Sintering machine head; 2. Sintering machine tail; 3. Bellows; 41. Dilute phase main flue; 42. Dense phase main flue; 5. Ring cooling fan; 52. Steam tracing heating device; 53. Induced fan ; 6, desulfurization agent; 61, 62, desulfurization agent injection device; 7, denitration agent; 71, 72, denitrification agent injection device; 81, 82, catalytic filter dust collector; 83, filter dust collector; 801, surface filter Membrane; 802, substrate; 803, dioxin; 804, dust particles; 805, clean flue gas; 9, main flue; 10, fan; 11, chimney.
具体实施方式Detailed ways
以下由特定的具体实施例说明发明的实施方式，熟悉此技术的人士可由本说明书所揭露的内容轻易地了解发明的其他优点及功效。The implementation of the invention will be described by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the invention from the content disclosed in this specification.
实施例1Example 1
如图1所示，本发明提供一种烧结烟气多污染物协同净化方法及净化系统，其中净化系统包括烟气净化装置和烟气加热装置，烟气净化装置包括用于与烧结机密封连接的主烟道，主烟道上沿烟气排出方向依次设置有脱硫剂喷射装置61、62，脱硝剂喷射装置71、72、,催化过滤式除尘器81、82，风机10，排气烟囱11和粉尘气力输送装置，烟气加热装置位于催化过滤式除尘器81、82前方，对主烟道内催化过滤式除尘器81、82上游的烟气进行加热，保证进入过催化滤式除尘器81、82内烟气温度在150～250℃范围内，以便进行催化反应。烟气经过主烟道，除尘管道，脱硫剂喷射装置61、62，脱硝剂喷射装置71、72，经过烟气加热装置将烟气温度加热至150～250℃，然后进入催化过滤式除尘器81、82，在滤袋表面实现粉尘颗粒及二氧化硫的净化，在滤袋内部实现氮氧化物及二噁英的净化，处理后的洁净烟气在排气装置作用下排出。该系统能够实现烧结烟气粉尘颗粒、二氧化硫、氮氧化物及二噁英的一次性协同净化。As shown in Figure 1, the present invention provides a multi-pollutant synergistic purification method and purification system for sintering flue gas, wherein the purification system includes a flue gas purification device and a flue gas heating device, and the flue gas purification device includes a The main flue is provided with desulfurizer injection devices 61, 62, denitrification agent injection devices 71, 72, catalytic filter dust collectors 81, 82, fan 10, exhaust chimney 11 and The dust pneumatic conveying device and the flue gas heating device are located in front of the catalytic filter dust collectors 81 and 82, and heat the flue gas upstream of the catalytic filter dust collectors 81 and 82 in the main flue to ensure that they enter the catalytic filter dust collectors 81 and 82 The temperature of the internal flue gas is in the range of 150-250°C to facilitate the catalytic reaction. The flue gas passes through the main flue, dust removal pipe, desulfurization agent injection device 61, 62, denitrification agent injection device 71, 72, passes through the flue gas heating device to heat the flue gas temperature to 150-250°C, and then enters the catalytic filter type dust collector 81 , 82, the purification of dust particles and sulfur dioxide is realized on the surface of the filter bag, the purification of nitrogen oxides and dioxins is realized inside the filter bag, and the cleaned flue gas after treatment is discharged under the action of the exhaust device. The system can realize one-time synergistic purification of sintering flue gas dust particles, sulfur dioxide, nitrogen oxides and dioxins.
为了降低能源消耗，本实施例中将主烟道按烟气温度分为浓相主烟道42、稀相主烟道41，浓相主烟道42和稀相主烟道41相互隔开，其他实施例中也可以为一根主烟道，浓相主烟道42和稀相主烟道41上均依次设置有脱硫剂喷射装置、脱硝剂喷射装置和催化过滤式除尘器，浓相主烟道42和稀相主烟道41尾端均与风机连接。即过滤式除尘器并联设置浓相除尘器和稀相除尘器；浓相除尘器、稀相除尘器入口管道相互独立，出口管道合用；共用风机和排气烟囱。由于烧结烟气中生成的氮氧化物及二噁英主要集中在高温段，高温段氮氧化物及二噁英的浓度高，低温段氮氧化物及二噁英的浓度偏低。稀相主烟道41、浓相主烟道42完全隔断，浓相主烟道42温度200～300℃，二噁英及氮氧化物浓度高，稀相主烟道41温度50～100℃，二噁英及氮氧化物浓度低。将烧结机头风箱的高温烟气管道与低温烟气管道隔绝，以提高高温烟气管道内烟气温度，因此浓相主烟道42内烟气温度能够达到催化温度条件，可以不用加热，只需在稀相主烟道41设置烟气加热装置即可，而且需要达到的温度不高，便于操作，减少能耗。In order to reduce energy consumption, in this embodiment, the main flue is divided into a dense-phase main flue 42 and a dilute-phase main flue 41 according to the temperature of the flue gas. The dense-phase main flue 42 and the dilute-phase main flue 41 are separated from each other. In other embodiments, it can also be a main flue. The dense-phase main flue 42 and the dilute-phase main flue 41 are sequentially provided with a desulfurizing agent injection device, a denitrification agent injection device and a catalytic filter type dust collector. Both the flue 42 and the tail end of the dilute-phase main flue 41 are connected with the fan. That is to say, the filter dust collector is equipped with a dense phase dust collector and a dilute phase dust collector in parallel; the inlet pipes of the dense phase dust collector and the dilute phase dust collector are independent of each other, and the outlet pipes are shared; the fan and exhaust chimney are shared. Since the nitrogen oxides and dioxins generated in the sintering flue gas are mainly concentrated in the high temperature section, the concentration of nitrogen oxides and dioxins in the high temperature section is high, and the concentration of nitrogen oxides and dioxins in the low temperature section is low. The dilute-phase main flue 41 and the dense-phase main flue 42 are completely separated, the temperature of the dense-phase main flue 42 is 200-300°C, the concentration of dioxins and nitrogen oxides is high, and the temperature of the dilute-phase main flue 41 is 50-100°C. Low concentration of dioxins and nitrogen oxides. The high-temperature flue gas pipeline of the sintering head bellows is isolated from the low-temperature flue gas pipeline to increase the temperature of the flue gas in the high-temperature flue gas pipeline. Therefore, the temperature of the flue gas in the dense phase main flue 42 can reach the catalytic temperature condition, and heating is not required. It is sufficient to install a flue gas heating device in the dilute-phase main flue 41, and the temperature to be reached is not high, which is convenient for operation and reduces energy consumption.
本例中采用环冷风机5出口与稀相主烟道41连通的方式，利用环冷风机5出口废气的热量对烟气加热，实现混风升温，使其温度在150～250℃即可，可以不利用外界加热进一步减少能源消耗，降低成本。In this example, the outlet of the ring cooling fan 5 is connected to the dilute-phase main flue 41, and the heat of the exhaust gas at the outlet of the ring cooling fan 5 is used to heat the flue gas to realize the temperature rise of the mixed air, so that the temperature can be kept at 150-250°C. It can further reduce energy consumption and cost without using external heating.
脱硫剂喷射装置61、62内的脱硫剂可以为石膏试剂、活性焦、或氨水等。石膏试剂中含质量比为5％～15％的CaCO3和Ca(OH)2，活性焦吸附剂的表面积为600～2000m2/g，氨水浓度为20％～30％。脱硝剂为氨水，氨水浓度为20％～30％。稀相主烟道41位置从临近烧结机头的主烟道开始，长度占主烟道总长度的45％～55％。浓相主烟道42上的催化过滤式除尘器82，工作温度维持在150℃～250℃，过滤风速为0.3～0.8m/s。The desulfurizing agent in the desulfurizing agent injection devices 61 and 62 may be gypsum reagent, activated coke, or ammonia water. The gypsum reagent contains CaCO3 and Ca(OH)2 with a mass ratio of 5%-15%, the surface area of the active coke adsorbent is 600-2000m2 /g, and the concentration of ammonia water is 20%-30%. The denitration agent is ammonia water, and the concentration of ammonia water is 20% to 30%. The position of the dilute-phase main flue 41 starts from the main flue adjacent to the sintering machine head, and the length accounts for 45% to 55% of the total length of the main flue. The catalytic filter type dust collector 82 on the dense phase main flue 42 maintains its working temperature at 150°C-250°C and the filtering wind speed at 0.3-0.8m/s.
如图4所示，催化过滤式除尘器81、82的滤袋为催化过滤式滤袋，包括表面覆膜801和负载了催化剂粉末的内部基材802，通过表面覆膜801实现除尘功能，同时混合了脱硝剂的洁净烟气，可在基材802表面的催化剂作用下，且表面覆膜801上有微孔，且微孔的平均粒径为0.8～1.2μm。基材802由聚四氟乙烯或玻璃纤维制成，催化剂粉末按一定比例混合后粘附在基材802表面，或堵塞在基材802孔缝中，或以盐溶液形式负载到基材802中，彻底降解二噁英及氮氧化物，催化剂粉末为Ti、Vi、W、Mo一种或几种元素的氧化物粉末，按一定比例混合后粘附在基材802表面；催化剂粉末粒度为200～300目，根据处理烟气中污染物浓度的不同，滤袋负载量为200～300g/㎡。含尘烟气按照自左至右的流向流动，烟气中含二噁英803及粉尘颗粒804，粉尘颗粒804在穿过表面覆膜801时被拦截，混合了脱硝剂的氮氧化物和二噁英803穿过表面覆膜801，在基材802处被彻底分解。最后，洁净烟气805穿过滤袋，排出催化过滤式除尘器81、82。As shown in Figure 4, the filter bags of catalytic filter type dust collectors 81, 82 are catalytic filter filter bags, which include a surface coating 801 and an internal substrate 802 loaded with catalyst powder. The dust removal function is realized by the surface coating 801, and at the same time The clean flue gas mixed with the denitration agent can be acted on by the catalyst on the surface of the substrate 802, and the surface coating 801 has micropores, and the average particle diameter of the micropores is 0.8-1.2 μm. The substrate 802 is made of polytetrafluoroethylene or glass fiber, and the catalyst powder is mixed in a certain proportion and adhered to the surface of the substrate 802, or blocked in the pores of the substrate 802, or loaded into the substrate 802 in the form of a salt solution , completely degrade dioxins and nitrogen oxides, the catalyst powder is Ti, Vi, W, Mo oxide powder of one or several elements, mixed in a certain proportion and adhered to the surface of the substrate 802; the particle size of the catalyst powder is 200 ~300 mesh, according to the concentration of pollutants in the treated flue gas, the load capacity of the filter bag is 200~300g/㎡. The dust-laden flue gas flows from left to right. The flue gas contains dioxin 803 and dust particles 804. The dust particles 804 are intercepted when passing through the surface coating 801, and nitrogen oxides and diox The oxins 803 pass through the surface coating 801 and are completely decomposed at the substrate 802 . Finally, the clean flue gas 805 passes through the filter bag and exits the catalytic filter dust collectors 81 and 82 .
本发明中净化方法包括以下步骤：Purification method comprises the following steps among the present invention:
a、将烧结烟气按照烟气温度及污染物浓度的不同分别引入浓相主烟道及稀相主烟道，温度和污染物浓度较高的烟气引入浓相主烟道，烟气温度和污染物浓度较低的引入稀相主烟道；a. The sintering flue gas is introduced into the dense-phase main flue and the dilute-phase main flue according to the flue gas temperature and pollutant concentration. The flue gas with higher temperature and pollutant concentration is introduced into the dense-phase main flue. and the introduction of dilute-phase main flue with low concentration of pollutants;
b、对稀相主烟道内烟气加热，并在浓相主烟道和稀相主烟道内沿烟气流动方向均依次喷入脱硫剂和脱硝剂，烟气中的二氧化硫与脱硫剂充分反应脱硫；b. Heat the flue gas in the dilute-phase main flue, and spray desulfurizer and denitrification agent in the dense-phase main flue and dilute-phase main flue along the direction of flue gas flow, and the sulfur dioxide in the flue gas will fully react with the desulfurizer Desulfurization;
c、浓相主烟道内和稀相主烟道内混入脱硝剂的烟气在风机作用下分别流动至两个催化过滤式除尘器，烟气中的粉尘在过滤式除尘器的滤袋表面被过滤；c. The flue gas mixed with denitration agent in the dense-phase main flue and the dilute-phase main flue flows to two catalytic filter dust collectors respectively under the action of the fan, and the dust in the flue gas is filtered on the filter bag surface of the filter dust collector ;
d、混合了脱硝剂的氮氧化物和二噁英的烟气穿过滤袋表面覆膜进入滤袋内部，在滤袋内部催化剂的作用下，氮氧化物及二噁英被彻底分解，实现烟气脱硝及脱二噁英；d. The flue gas of nitrogen oxides and dioxins mixed with denitrification agent passes through the surface coating of the filter bag and enters the inside of the filter bag. Under the action of the catalyst inside the filter bag, the nitrogen oxides and dioxins are completely decomposed to achieve smoke Gas denitrification and dioxin removal;
f、经过滤式除尘器过滤后的洁净烟气在风机作用下汇入同一主烟道，并从烟囱排出。f. The clean flue gas filtered by the filter dust collector flows into the same main flue under the action of the fan, and is discharged from the chimney.
本发明详细工作步骤如下：The detailed working steps of the present invention are as follows:
烧结原料通过布料器均匀加入烧结台车，在皮带机作用下，自烧结机头1移动至烧结机尾2，经过低温预烧、中温升温烧结、高温保温三个阶段完成烧结，其中在烧结阶段，温度会达到800～1200℃。烧结完成后，在机尾卸料，由单辊破碎机破碎后进入环冷风机5冷却。The sintering raw materials are evenly added to the sintering trolley through the distributor, and under the action of the belt conveyor, they move from the sintering head 1 to the sintering tail 2, and the sintering is completed in three stages: low-temperature pre-sintering, medium-temperature heating sintering, and high-temperature heat preservation. , the temperature will reach 800 ~ 1200 ℃. After the sintering is completed, the material is unloaded at the tail of the machine, crushed by the single roll crusher, and then enters the ring cooling fan 5 for cooling.
烧结过程中会产生大量烟气，穿过烧结料层后，自风箱3排出。烧结过程中产生的大量粉尘、二氧化硫、氮氧化物、二噁英等污染物随烟气排出，其中，高温烟气产生的污染物浓度高，在风机10作用下经过风箱汇总至浓相主烟道42，低温烟气产生的污染物浓度较低，在风机10作用下经过风箱汇总至稀相主烟道41。A large amount of flue gas will be generated during the sintering process, and will be discharged from the bellows 3 after passing through the sintering material layer. A large amount of dust, sulfur dioxide, nitrogen oxides, dioxins and other pollutants produced during the sintering process are discharged with the flue gas. Among them, the high-temperature flue gas has a high concentration of pollutants. The low-temperature flue gas has a low concentration of pollutants, which are collected in the dilute-phase main flue 41 through the wind box under the action of the fan 10 .
本实施例中，高温烟气中二噁英浓度为0.5～2.0ngTEQ/Nm3，氮氧化物浓度为300～500mg/m3，二氧化硫浓度为1000～2000mg/Nm3，粉尘浓度为10～15g/Nm3。In this example, the concentration of dioxin in the high-temperature flue gas is 0.5-2.0ngTEQ/Nm3 , the concentration of nitrogen oxides is 300-500mg/m3 , the concentration of sulfur dioxide is 1000-2000mg/Nm3 , and the concentration of dust is 10-15g /Nm3 .
低温烟气中二噁英浓度为0.5～1.0ngTEQ/Nm3，氮氧化物浓度为300～400mg/m3，二氧化硫浓度为1000～2000mg/Nm3，粉尘浓度为10～15g/Nm3。The concentration of dioxin in low temperature flue gas is 0.5~1.0ngTEQ/Nm3 , the concentration of nitrogen oxide is 300~400mg/m3 , the concentration of sulfur dioxide is 1000~2000mg/Nm3 , and the concentration of dust is 10~15g/Nm3 .
环冷风机5烟气量30万～40万Nm3/h，浓相主烟道42烟气流量50万～55万Nm3/h，烟气温度200℃～300℃，稀相主烟道41烟气流量45万～50万Nm3/h，烟气温度100℃～130℃。Ring cooling fan 5 with flue gas volume of 300,000-400,000 Nm3 /h, dense-phase main flue 42 flue gas flow of 500,000-550,000 Nm3 /h, flue gas temperature 200°C-300°C, dilute-phase main flue 41 The flue gas flow rate is 450,000-500,000 Nm3 /h, and the flue gas temperature is 100°C-130°C.
稀相主烟道41的烟气在风机10作用下流动，脱硫剂6由脱硫喷射装置61喷入烟道内，实现烟气脱硫。然后与环冷风机5出口高温废气混合升温后，流向催化过滤式除尘器81。在此之前，脱硝剂7由脱硝喷射装置71喷入烟道内，混合了脱硝剂的高温烟气流经催化过滤式除尘器81，在催化滤袋的表面，烟气中的粉尘得到过滤，初步过滤后的烟气流经催化滤袋基层，在此处催化剂的作用下，氮氧化物、二噁英得到彻底分解。The flue gas in the dilute-phase main flue 41 flows under the action of the fan 10, and the desulfurization agent 6 is sprayed into the flue by the desulfurization injection device 61 to realize flue gas desulfurization. Then it is mixed with the high-temperature exhaust gas at the outlet of the ring cooling fan 5 to heat up, and then flows to the catalytic filter type dust collector 81 . Prior to this, the denitrification agent 7 is sprayed into the flue by the denitrification injection device 71, and the high-temperature flue gas mixed with the denitrification agent flows through the catalytic filter type dust collector 81, and the dust in the flue gas is filtered on the surface of the catalytic filter bag. The filtered flue gas flows through the base layer of the catalytic filter bag, where nitrogen oxides and dioxins are completely decomposed under the action of the catalyst.
浓相主烟道42的高温烟气在风机作用下流向催化过滤式除尘器82。在此之前，脱硫剂6和脱硝剂7由脱硫喷射装置62和脱硝喷射装置72喷入烟道内，最终混合了脱硝剂的高温烟气在催化过滤式除尘器82处得到净化，在催化滤袋的表面，烟气中的粉尘得到过滤，初步过滤后的烟气流经催化滤袋基层，在此处催化剂的作用下，氮氧化物、二噁英得到彻底分解。The high-temperature flue gas from the dense-phase main flue 42 flows to the catalytic filter dust collector 82 under the action of the fan. Before that, the desulfurization agent 6 and the denitrification agent 7 are sprayed into the flue by the desulfurization injection device 62 and the denitrification injection device 72, and finally the high-temperature flue gas mixed with the denitrification agent is purified at the catalytic filter dust collector 82, and the catalytic filter bag The dust in the flue gas is filtered, and the pre-filtered flue gas flows through the base layer of the catalytic filter bag, where nitrogen oxides and dioxins are completely decomposed under the action of the catalyst.
净化后的浓相主烟道42烟气和稀相主烟道41烟气汇合至主烟道9，在风机10作用下排入排气烟囱11。The purified flue gas from the dense-phase main flue 42 and the dilute-phase main flue 41 merge into the main flue 9 and are discharged into the exhaust chimney 11 under the action of the fan 10 .
实施例2Example 2
如图2所示，本例中烧结原料通过布料器均匀加入烧结台车，在皮带机作用下，自烧结机头1移动至烧结机尾2，经过低温预烧、中温升温烧结、高温保温三个阶段完成烧结，其中在烧结阶段，温度会达到800～1200℃。As shown in Figure 2, in this example, the sintering raw materials are evenly added to the sintering trolley through the distributor, and are moved from the sintering machine head 1 to the sintering machine tail 2 under the action of the belt conveyor. The sintering is completed in three stages, and in the sintering stage, the temperature will reach 800-1200°C.
烧结过程中会产生大量烟气，穿过烧结料层后，自风箱3排出。烧结过程中产生的大量粉尘、二氧化硫、氮氧化物、二噁英等污染物随烟气排出，其中，高温烟气产生的污染物浓度高，在风机10作用下经过风箱汇总至浓相主烟道42，低温烟气产生的污染物浓度较低，在风机10作用下经过风箱汇总至稀相主烟道41。A large amount of flue gas will be generated during the sintering process, and will be discharged from the bellows 3 after passing through the sintering material layer. A large amount of dust, sulfur dioxide, nitrogen oxides, dioxins and other pollutants produced during the sintering process are discharged with the flue gas. Among them, the high-temperature flue gas has a high concentration of pollutants. The low-temperature flue gas has a low concentration of pollutants, which are collected in the dilute-phase main flue 41 through the wind box under the action of the fan 10 .
本实施例中，高温烟气中二噁英浓度为0.5～2.0ngTEQ/Nm3，氮氧化物浓度为300～500mg/m3，二氧化硫浓度为1000～2000mg/Nm3，粉尘浓度为10～15g/Nm3.In this example, the concentration of dioxin in the high-temperature flue gas is 0.5-2.0ngTEQ/Nm3 , the concentration of nitrogen oxides is 300-500mg/m3 , the concentration of sulfur dioxide is 1000-2000mg/Nm3 , and the concentration of dust is 10-15g /Nm3 .
本实施例中，低温烟气中二噁英浓度为0.5～1.0ngTEQ/Nm3，氮氧化物浓度为300～400mg/m3，二氧化硫浓度为1000～2000mg/Nm3，粉尘浓度为10～15g/Nm3.In this example, the concentration of dioxin in the low-temperature flue gas is 0.5-1.0ngTEQ/Nm3 , the concentration of nitrogen oxides is 300-400mg/m3 , the concentration of sulfur dioxide is 1000-2000mg/Nm3 , and the concentration of dust is 10-15g /Nm3 .
环冷风机5烟气量30万～40万Nm3/h，浓相主烟道42烟气流量50万～55万Nm3/h，烟气温度200℃～300℃，稀相主烟道41烟气流量45万～50万Nm3/h，烟气温度100℃～130℃.Ring cooling fan 5 with flue gas volume of 300,000-400,000 Nm3 /h, dense-phase main flue 42 flue gas flow of 500,000-550,000 Nm3 /h, flue gas temperature 200°C-300°C, dilute-phase main flue 41 The flue gas flow rate is 450,000 to 500,000 Nm3 /h, and the flue gas temperature is 100°C to 130°C.
稀相主烟道41的烟气在风机作用下流动，脱硫剂6由脱硫喷射装置61喷入烟道内，实现烟气脱硫。然后在蒸汽管道伴热下逐步升温至200℃左右的高温烟气，烟气流向催化过滤式除尘器81。在此之前，脱硝剂7由脱硝喷射装置71喷入烟道内，混合了脱硝剂的高温烟气流经催化过滤式除尘器81，在催化滤袋的表面，烟气中的粉尘得到过滤，初步过滤后的烟气流经催化滤袋基层，在此处催化剂的作用下，氮氧化物、二噁英得到彻底分解。The flue gas in the dilute-phase main flue 41 flows under the action of the fan, and the desulfurization agent 6 is sprayed into the flue by the desulfurization injection device 61 to realize flue gas desulfurization. Then, under the heat traced by the steam pipeline, the temperature is gradually raised to the high-temperature flue gas of about 200° C., and the flue gas flows to the catalytic filter dust collector 81 . Prior to this, the denitrification agent 7 is sprayed into the flue by the denitrification injection device 71, and the high-temperature flue gas mixed with the denitrification agent flows through the catalytic filter type dust collector 81, and the dust in the flue gas is filtered on the surface of the catalytic filter bag. The filtered flue gas flows through the base layer of the catalytic filter bag, where nitrogen oxides and dioxins are completely decomposed under the action of the catalyst.
浓相主烟道42的高温烟气在风机10作用下流向催化过滤式除尘器82。在此之前，脱硫剂6和脱硝剂7由脱硫喷射装置62和脱硝喷射装置72喷入烟道内，最终混合了脱硝剂的高温烟气在催化过滤式除尘器82处得到净化，在催化滤袋的表面，烟气中的粉尘得到过滤，初步过滤后的烟气流经催化滤袋基层，在此处催化剂的作用下，氮氧化物、二噁英得到彻底分解。The high-temperature flue gas from the dense-phase main flue 42 flows to the catalytic filter type dust collector 82 under the action of the fan 10 . Before that, the desulfurization agent 6 and the denitrification agent 7 are sprayed into the flue by the desulfurization injection device 62 and the denitrification injection device 72, and finally the high-temperature flue gas mixed with the denitrification agent is purified at the catalytic filter dust collector 82, and the catalytic filter bag The dust in the flue gas is filtered, and the pre-filtered flue gas flows through the base layer of the catalytic filter bag, where nitrogen oxides and dioxins are completely decomposed under the action of the catalyst.
净化后的浓相主烟道42烟气和稀相主烟道41烟气汇合至主烟道9，在风机10作用下排入烟囱11。The purified flue gas from the dense-phase main flue 42 and the dilute-phase main flue 41 merge into the main flue 9 and are discharged into the chimney 11 under the action of the fan 10 .
实施例3Example 3
如图3所示，烧结原料通过布料器均匀加入烧结台车，在皮带机作用下，自烧结机头1移动至烧结机尾2，经过低温预烧、中温升温烧结、高温保温三个阶段完成烧结，其中在烧结阶段，温度会达到800～1200℃。烧结完成后，在机尾卸料，由单辊破碎机破碎后进入环冷风机5冷却，环冷风机5废气在引风机53作用下排出。As shown in Figure 3, the sintering raw materials are evenly added to the sintering trolley through the distributor, and under the action of the belt conveyor, they move from the sintering machine head 1 to the sintering machine tail 2, and are completed in three stages: low-temperature pre-sintering, medium-temperature heating sintering, and high-temperature heat preservation Sintering, wherein in the sintering stage, the temperature will reach 800-1200°C. After the sintering is completed, the material is unloaded at the tail of the machine, crushed by the single-roller crusher, and then enters the ring cooling fan 5 for cooling, and the waste gas of the ring cooling fan 5 is discharged under the action of the induced draft fan 53.
烧结过程中会产生大量烟气，穿过烧结料层后，自风箱3排出。烧结过程中产生的大量粉尘、二氧化硫、氮氧化物、二噁英等污染物随烟气排出，其中，高温烟气产生的污染物浓度高，在风机10作用下经过风箱汇总至浓相主烟道42，低温烟气产生的污染物浓度较低，在风机10作用下经过风箱汇总至稀相主烟道41。A large amount of flue gas will be generated during the sintering process, and will be discharged from the bellows 3 after passing through the sintering material layer. A large amount of dust, sulfur dioxide, nitrogen oxides, dioxins and other pollutants produced during the sintering process are discharged with the flue gas. Among them, the high-temperature flue gas has a high concentration of pollutants. The low-temperature flue gas has a low concentration of pollutants, which are collected in the dilute-phase main flue 41 through the wind box under the action of the fan 10 .
本实施例中，高温烟气中二噁英浓度为0.5～2.0ngTEQ/Nm3，氮氧化物浓度为300～500mg/m3，二氧化硫浓度为1000～2000mg/Nm3，粉尘浓度为10～15g/Nm3。In this example, the concentration of dioxin in the high-temperature flue gas is 0.5-2.0ngTEQ/Nm3 , the concentration of nitrogen oxides is 300-500mg/m3 , the concentration of sulfur dioxide is 1000-2000mg/Nm3 , and the concentration of dust is 10-15g /Nm3 .
本实施例中，低温烟气中二噁英浓度为0.2～0.5ngTEQ/Nm3，氮氧化物浓度为0～300mg/m3，二氧化硫浓度为1000～2000mg/Nm3，粉尘浓度为10～15g/Nm3。In this example, the concentration of dioxin in the low-temperature flue gas is 0.2-0.5ngTEQ/Nm3 , the concentration of nitrogen oxides is 0-300mg/m3 , the concentration of sulfur dioxide is 1000-2000mg/Nm3 , and the concentration of dust is 10-15g /Nm3 .
环冷风机5烟气量30万～40万Nm3/h，浓相主烟道42烟气流量50万～55万Nm3/h，烟气温度200℃～300℃，稀相主烟道41烟气流量45万～50万Nm3/h，烟气温度100℃～130℃。Ring cooling fan 5 with flue gas volume of 300,000-400,000 Nm3 /h, dense-phase main flue 42 flue gas flow of 500,000-550,000 Nm3 /h, flue gas temperature 200°C-300°C, dilute-phase main flue 41 The flue gas flow rate is 450,000-500,000 Nm3 /h, and the flue gas temperature is 100°C-130°C.
稀相主烟道41的烟气在风机10作用下流动，与环冷风机5出口高温废气混合升温后，流向过滤式除尘器83。在此之前，脱硫剂6由脱硫喷射装置61喷入烟道内实现烟气脱硫，脱硫后的烟气在过滤式除尘器83处得到净化，出口烟气粉尘浓度低于30mg/Nm3，二氧化硫浓度低于200mg/Nm3。由于本例中稀相主烟道41烟气的二噁英、氮氧化物等浓度较低，不用加热和催化即可完全分解，因此省去了催化环节和加热环节。The flue gas in the dilute-phase main flue 41 flows under the action of the fan 10 , mixes with the high-temperature exhaust gas at the outlet of the ring cooling fan 5 and heats up, and then flows to the filter dust collector 83 . Prior to this, the desulfurization agent 6 is sprayed into the flue by the desulfurization injection device 61 to achieve flue gas desulfurization. The desulfurized flue gas is purified at the filter dust collector 83, and the dust concentration of the flue gas at the outlet is lower than 30mg/Nm3 , and the concentration of sulfur dioxide Less than 200mg/Nm3 . Since the concentration of dioxins and nitrogen oxides in the flue gas of the dilute-phase main flue 41 in this example is relatively low, they can be completely decomposed without heating and catalysis, so the catalysis and heating links are omitted.
浓相主烟道42的高温烟气在风机10作用下流向催化过滤式除尘器82。在此之前，脱硫剂6和脱硝剂7由脱硫喷射装置62和脱硝喷射装置72喷入烟道内，最终混合了脱硝剂7的高温烟气在催化过滤式除尘器82处得到净化，在催化滤袋的作用下，烟气中的粉尘得到过滤，同时氮氧化物、二噁英得到彻底分解。净化后的浓相主烟道42烟气和稀相主烟道41烟气汇合至主烟道9，在风机10作用下排入排气烟囱11。The high-temperature flue gas from the dense-phase main flue 42 flows to the catalytic filter type dust collector 82 under the action of the fan 10 . Before this, desulfurization agent 6 and denitrification agent 7 are sprayed into the flue by desulfurization injection device 62 and denitrification injection device 72, and finally the high-temperature flue gas mixed with denitrification agent 7 is purified at catalytic filter dust collector 82, and after catalytic filter Under the action of the bag, the dust in the flue gas is filtered, and nitrogen oxides and dioxins are completely decomposed. The purified flue gas from the dense-phase main flue 42 and the dilute-phase main flue 41 merge into the main flue 9 and are discharged into the exhaust chimney 11 under the action of the fan 10 .
本发明结构简单，流程合理，运行稳定可靠，无二次污染，能有效对烧结烟气中的粉尘、二氧化硫、氮氧化物及二噁英同时净化，通过该系统，保证净化后排放的烟气中颗粒物浓度≤20mg/Nm3，二氧化硫浓度≤20mg/Nm3，氮氧化物浓度≤300mg/Nm3，二噁英浓度在0～0.5ng-TEQ/Nm3，排放标准低于现有国家标准。The invention has simple structure, reasonable process, stable and reliable operation, no secondary pollution, and can effectively purify dust, sulfur dioxide, nitrogen oxides and dioxins in the sintering flue gas at the same time. Through this system, the flue gas discharged after purification can be guaranteed Concentration of particulate matter ≤ 20mg/Nm3 , concentration of sulfur dioxide ≤ 20mg/Nm3 , concentration of nitrogen oxides ≤ 300mg/Nm3 , concentration of dioxins in the range of 0-0.5ng-TEQ/Nm3 , the discharge standard is lower than the existing national standard .
任何熟悉此技术的人士皆可在不违背发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由发明的权利要求所涵盖。Anyone familiar with this technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the invention should still be covered by the claims of the invention.
| Application Number | Priority Date | Filing Date | Title |
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| CN201510083009.8ACN104607015A (en) | 2015-02-15 | 2015-02-15 | Multi-pollutant co-purification method and multi-pollutant co-purification system for sintering flue gas |
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| CN201510083009.8ACN104607015A (en) | 2015-02-15 | 2015-02-15 | Multi-pollutant co-purification method and multi-pollutant co-purification system for sintering flue gas |
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