技术领域technical field
本实用新型涉及工业废水处理领域，特别是涉及一种脱硫废水零排放系统。The utility model relates to the field of industrial wastewater treatment, in particular to a zero-discharge system for desulfurization wastewater.
背景技术Background technique
我国是一个以煤炭为主要能源的国家，燃煤发电是我国煤炭利用的最重要途径之一。根据我国的国情，二十一世纪燃煤发电仍将占主导地位。在燃煤火电机组排放的众多大气污染物中，SO2以及粉尘对环境的危害较大，是要控制的主要污染物。随着社会的进步和经济的发展，火电厂对大气环境的污染已受到人们的普遍关注，因此有效的降低污染物排放以降低对环境的影响是我国能源领域可持续发展所面临的严峻挑战。my country is a country that uses coal as the main energy source, and coal-fired power generation is one of the most important ways of coal utilization in my country. According to my country's national conditions, coal-fired power generation will still dominate in the 21st century. Among the many air pollutants emitted by coal-fired thermal power units, SO2 and dust are more harmful to the environment and are the main pollutants to be controlled. With the progress of society and the development of economy, the pollution of thermal power plants to the atmospheric environment has been widely concerned by people. Therefore, it is a severe challenge for the sustainable development of my country's energy field to effectively reduce pollutant emissions and reduce the impact on the environment.
目前，已有的烟气脱硫技术包括湿法脱硫和干法脱硫等。其中湿法脱硫技术的运用最为广泛。湿法烟气脱硫是当今国际上85％左右大型火电厂采用的工艺流程。湿法烟气脱硫系统废水由于汞、铅、镍、砷和铬重金属离子含量较高，直接排放的危害很大，普通化学处理方法又过于复杂，且需要不断添加化学药品，耗费人力。基于此，降低脱硫废水对环境的污染成为了亟待解决的问题。At present, the existing flue gas desulfurization technologies include wet desulfurization and dry desulfurization. Among them, wet desulfurization technology is the most widely used. Wet flue gas desulfurization is a technological process adopted by about 85% of large thermal power plants in the world today. Due to the high content of mercury, lead, nickel, arsenic and chromium heavy metal ions in the waste water of wet flue gas desulfurization system, the direct discharge is very harmful, and the common chemical treatment method is too complicated, and needs to continuously add chemicals, which is labor-intensive. Based on this, reducing the pollution of desulfurization wastewater to the environment has become an urgent problem to be solved.
实用新型内容Utility model content
本实用新型的目的在于，提供一种脱硫废水零排放系统，能够降低脱硫废水对环境的污染，将水从其中分离出来重新利用，将其中剩余的杂质等以固体的形式分离出来，实现污染物的零排放，彻底解决脱硫废水对环境污染的问题。The purpose of this utility model is to provide a zero-discharge system for desulfurization wastewater, which can reduce the pollution of desulfurization wastewater to the environment, separate the water from it for reuse, and separate the remaining impurities in the form of solids, so as to realize the pollution of pollutants. Zero discharge, completely solve the problem of environmental pollution caused by desulfurization wastewater.
为解决上述技术问题，本实用新型采用如下的技术方案：In order to solve the problems of the technologies described above, the utility model adopts the following technical solutions:
一种脱硫废水零排放系统，包括：依次连通的第一反应池、第二反应池、管式超滤膜装置、钠离子交换器、纳滤膜装置、反渗透海水淡化装置、蒸发器、离心机和干燥剂，还包括冷冻脱硝装置，冷冻脱硝装置和纳滤膜装置相连通。A zero-discharge system for desulfurization wastewater, comprising: a first reaction pool, a second reaction pool, a tubular ultrafiltration membrane device, a sodium ion exchanger, a nanofiltration membrane device, a reverse osmosis seawater desalination device, an evaporator, a centrifugal Machine and desiccant, also includes a freeze denitrification device, the freeze denitrification device and the nanofiltration membrane device are connected.
本系统选择了化学加药软化和管式微滤膜处理工艺。其中的管式微滤膜是本处理工艺的最关键部分，承担着取代沉淀池做固液分离和向后端回收纳滤装置、输送合格进水的双重功能。为后续零排放系统服务，而这里由于化学加药软化加管式膜固液分离的工艺能显著提高纳滤的回收率，可显著的降低造价和运行费用。选用废水专用微滤膜，聚偏氟乙烯材质，抗氧化、耐强酸碱、耐摩擦、清洗方便。微滤膜采用特殊工艺制造，表面平整光滑、微孔率高，可在100磅的冲击压力下正常运行，不会出现滤膜破裂、颗粒穿透现象，使用寿命可达5年以上。The system chooses chemical dosing softening and tubular microfiltration membrane treatment process. Among them, the tubular microfiltration membrane is the most critical part of this treatment process, which undertakes the dual functions of replacing the sedimentation tank for solid-liquid separation, recovering the nanofiltration device to the back end, and delivering qualified influent water. It serves the follow-up zero-emission system, and the process of chemical dosing softening and tubular membrane solid-liquid separation can significantly improve the recovery rate of nanofiltration, which can significantly reduce the cost of construction and operation. The special microfiltration membrane for waste water is selected, made of polyvinylidene fluoride, which is anti-oxidation, strong acid and alkali resistance, friction resistance, and easy to clean. The microfiltration membrane is manufactured with a special process, the surface is smooth and smooth, and the microporosity is high. It can operate normally under the impact pressure of 100 pounds, and there will be no membrane rupture and particle penetration. The service life can reach more than 5 years.
另外，管式膜不同于其他微滤或超滤膜，它采用错流方式运行，在运行和反冲时并无水的损耗。因此，事实上几乎可获得100％的回收率，将几乎所有的进水通过管式微滤膜过滤后送往反渗透单元。In addition, unlike other microfiltration or ultrafiltration membranes, the tubular membrane operates in a cross-flow manner, and there is no water loss during operation and backflushing. Therefore, almost 100% recovery can be obtained in fact, and almost all the feed water is filtered through the tubular microfiltration membrane and sent to the reverse osmosis unit.
本设计方案采用过滤精度为0.1μm的管式微滤系统作为反渗透的前处理，大大缩短简化了工艺流程，减少了系统占地面积，提高了反渗透系统的回收率，并有效延长反渗透系统的使用寿命。This design scheme uses a tubular microfiltration system with a filtration accuracy of 0.1 μm as the pretreatment of reverse osmosis, which greatly shortens and simplifies the process flow, reduces the system footprint, improves the recovery rate of the reverse osmosis system, and effectively extends the reverse osmosis system. service life.
相较于其他微滤或超滤膜组件，管式微滤膜具有强度好、耐摩擦、耐高浓度药剂清洗、可在极高悬浮固体浓度下稳定运行、可耐受进水水质波动等优良性能。Compared with other microfiltration or ultrafiltration membrane components, the tubular microfiltration membrane has excellent performances such as good strength, friction resistance, high concentration chemical cleaning resistance, stable operation at extremely high suspended solid concentration, and tolerance to fluctuations in influent water quality. .
前述的脱硫废水零排放系统中，第二反应池和管式超滤膜装置之间设有浓缩槽，还包括与浓缩槽连通的脱水装置，脱水装置连接有排泥装置。In the aforementioned zero-discharge system for desulfurization wastewater, a concentration tank is provided between the second reaction tank and the tubular ultrafiltration membrane device, and a dehydration device connected to the concentration tank is also included, and the dehydration device is connected to a sludge discharge device.
前述的脱硫废水零排放系统中，还包括保安过滤器，保安过滤器设置在反渗透海水淡化装置和纳滤膜装置之间，保安过滤器与反渗透海水淡化装置和纳滤膜装置相连通。The aforementioned zero discharge system for desulfurization wastewater also includes a security filter, which is arranged between the reverse osmosis seawater desalination device and the nanofiltration membrane device, and the security filter is connected to the reverse osmosis seawater desalination device and the nanofiltration membrane device.
前述的脱硫废水零排放系统中，反渗透海水淡化装置和蒸发器之间设有浓水箱，浓水箱和反渗透海水淡化装置和蒸发器相连通，浓水箱和钠离子交换器相连通。In the aforementioned desulfurization wastewater zero discharge system, a concentrated water tank is provided between the reverse osmosis seawater desalination device and the evaporator, the concentrated water tank is connected to the reverse osmosis seawater desalination device and the evaporator, and the concentrated water tank is connected to the sodium ion exchanger.
前述的脱硫废水零排放系统中，蒸发器包括相互连通的降膜蒸发器和机械式蒸汽再压缩装置，降膜蒸发器和反渗透海水淡化装置相连通，机械式蒸汽再压缩装置和离心机相连通。In the aforementioned desulfurization wastewater zero discharge system, the evaporator includes a falling film evaporator and a mechanical vapor recompression device connected to each other, the falling film evaporator is connected to the reverse osmosis seawater desalination device, and the mechanical vapor recompression device is connected to the centrifuge Pass.
与现有技术相比，本实用新型能够将脱硫废水中的水分离出来重新利用，成为生活、工业可用水，将脱硫废水中的其它杂质以固体的形式分离出来，不会产生对自然环境有害的污染物，能够彻底的解决脱硫废水对环境污染的问题。Compared with the prior art, the utility model can separate the water in the desulfurization wastewater and reuse it to become domestic and industrial water, and separate other impurities in the desulfurization wastewater in the form of solid, which will not cause harm to the natural environment. Pollutants can completely solve the problem of environmental pollution caused by desulfurization wastewater.
附图说明Description of drawings
图1是本实用新型的一种实施例的结构示意图。Fig. 1 is a schematic structural view of an embodiment of the present invention.
附图标记：1-脱硫废水浓水池，2-第一反应池，3-第二反应池，4-浓缩槽，5-管式超滤膜装置，6-中和池，7-钠离子交换器，8-加热器，9-纳滤膜装置，10-冷冻脱硝装置，11-纳滤产水池，12-第一提升泵，13-保安过滤器，14-反渗透海水淡化装置，15-浓水箱，16-第二提升泵，17-降膜蒸发器，18-机械式蒸汽再压缩装置，19-离心机，20-干燥机，21-脱水装置，22-排泥装置。Reference signs: 1-concentrated desulfurization wastewater tank, 2-first reaction tank, 3-second reaction tank, 4-concentration tank, 5-tubular ultrafiltration membrane device, 6-neutralization tank, 7-sodium ion exchange device, 8-heater, 9-nanofiltration membrane device, 10-refrigerated denitrification device, 11-nanofiltration production tank, 12-first lift pump, 13-security filter, 14-reverse osmosis desalination device, 15- Concentrated water tank, 16-second lift pump, 17-falling film evaporator, 18-mechanical vapor recompression device, 19-centrifuge, 20-dryer, 21-dehydration device, 22-sludge discharge device.
下面结合附图和具体实施方式对本实用新型作进一步的说明。Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described.
具体实施方式Detailed ways
本实用新型的实施例1：如图1所示，本实用新型还公开了一种脱硫废水零排放系统，包括：依次连通的第一反应池2、第二反应池3、管式超滤膜装置5、钠离子交换器7、纳滤 膜装置9、反渗透海水淡化装置14、蒸发器、离心机19和干燥机20，还包括冷冻脱硝装置10，冷冻脱硝装置10和纳滤膜装置9相连通。Embodiment 1 of the utility model: as shown in Figure 1, the utility model also discloses a zero-discharge system for desulfurization wastewater, including: a first reaction pool 2, a second reaction pool 3, and a tubular ultrafiltration membrane connected in sequence Device 5, sodium ion exchanger 7, nanofiltration membrane device 9, reverse osmosis seawater desalination device 14, evaporator, centrifuge 19 and dryer 20, also includes freeze denitrification device 10, freeze denitrification device 10 and nanofiltration membrane device 9 connected.
第二反应池3和管式超滤膜装置5之间设有浓缩槽4，还包括与浓缩槽4连通的脱水装置21，脱水装置21连接有排泥装置22。A concentrating tank 4 is provided between the second reaction tank 3 and the tubular ultrafiltration membrane device 5 , and a dehydration device 21 communicating with the concentrating tank 4 is also included. The dehydration device 21 is connected with a sludge discharge device 22 .
还包括保安过滤器13，保安过滤器13设置在反渗透海水淡化装置14和纳滤膜装置9之间，保安过滤器13与反渗透海水淡化装置14和纳滤膜装置9相连通。It also includes a security filter 13, the security filter 13 is arranged between the reverse osmosis seawater desalination device 14 and the nanofiltration membrane device 9, and the security filter 13 communicates with the reverse osmosis seawater desalination device 14 and the nanofiltration membrane device 9.
反渗透海水淡化装置14和蒸发器之间设有浓水箱15，浓水箱15与反渗透海水淡化装置14和蒸发器相连通，浓水箱15和钠离子交换器7相连通。A concentrated water tank 15 is arranged between the reverse osmosis seawater desalination device 14 and the evaporator, the concentrated water tank 15 communicates with the reverse osmosis seawater desalination device 14 and the evaporator, and the concentrated water tank 15 communicates with the sodium ion exchanger 7 .
蒸发器包括相互连通的降膜蒸发器17和机械式蒸汽再压缩装置18，降膜蒸发器17和反渗透海水淡化装置14相连通，机械式蒸汽再压缩装置18和离心机19相连通。The evaporator includes a falling film evaporator 17 and a mechanical vapor recompression device 18 that communicate with each other. The falling film evaporator 17 communicates with a reverse osmosis seawater desalination device 14 , and the mechanical vapor recompression device 18 communicates with a centrifuge 19 .
本实用新型的一种实施例的工作原理：脱硫废水首先进入脱硫废水浓水池1，然后经过第一反应池2，在第一反应池2内添加氢氧化钠、镁盐和氧化镁，形成氢氧化镁沉淀物并与硅共沉淀，同时添加次氯酸钠用于抑制微生物滋生；在第二反应池3内添加碳酸钠和碱(石灰或氢氧化钠)，形成碳酸钙沉淀；脱硫废水然后流向浓水槽4内，脱硫废水在浓水槽4内进行充分沉淀，其中沉淀后的杂质通往脱水装置21，脱水装置21对分离出来的杂质进行脱水后由排泥装置22排出。通过管式超滤膜装置5的废水流向中和池6，在中和池6内进行酸碱度平衡，然后流向钠离子交换器7，钠离子交换器7除去废水中所有非一价阴离子(有结垢倾向离子)，然后经过加热器8预加热后通往纳滤膜装置9，纳滤膜装置9可以脱除分子大小在1纳米左右的溶质，被纳滤膜装置9分离出来的溶质经过冷冻脱硝装置10处理后形成十水合硫酸钠晶体，将十水合硫酸钠晶体采用分离机分离后的母液回到纳滤膜装置9中继续循环分离，高纯度的十水合硫酸钠可以作为工业原料销售。通过纳滤膜装置9的废水流向纳滤产水池11，然后在第一提升泵12的作用下通往保安过滤器13，保安过滤器13作为废水通往反渗透海水淡化装置14的预处理，将废水中1度以上的细小微粒分离出来。经过保安过滤器13的废水通往反渗透海水淡化装置14，反渗透海水淡化装置14将废水中60％的纯水分离出来，被分离出来的纯水作为工业或者生活用水回收利用。通过反渗透海水淡化装置14的高浓度氯化钠溶液首先通往浓水箱15，高浓度的氯化钠溶液在第二提升泵16的作用下通往降膜蒸发器17，与此同时，部分高浓度氯化钠溶液流向钠离子交换器7，用于再生钠离子交换床。降膜蒸发器17将浓氯化钠溶液中的水分离出来，得到浓度更高的氯化钠溶液，在机械式蒸汽再压缩装置18的作用下所述浓度更高的氯化钠溶液被分离出剩余的大部分的水，形成氯化钠结晶；在离心机19和干燥机20的作用下氯化钠结晶形成固体盐。经过本系统处理的脱硫废 水不会外排任何废水，彻底地处理了工业废水。The working principle of an embodiment of the utility model: the desulfurization wastewater first enters the desulfurization wastewater concentrated water pool 1, then passes through the first reaction pool 2, and adds sodium hydroxide, magnesium salt and magnesium oxide in the first reaction pool 2 to form hydrogen Magnesium oxide precipitates and co-precipitates with silicon, and sodium hypochlorite is added to inhibit the growth of microorganisms; sodium carbonate and alkali (lime or sodium hydroxide) are added in the second reaction tank 3 to form calcium carbonate precipitation; desulfurization wastewater then flows to the concentrated water tank 4, the desulfurization wastewater is fully precipitated in the concentrated water tank 4, wherein the precipitated impurities are passed to the dehydration device 21, and the dehydration device 21 dehydrates the separated impurities and then is discharged from the sludge discharge device 22. The waste water through the tubular ultrafiltration membrane device 5 flows to the neutralization tank 6, carries out pH balance in the neutralization tank 6, then flows to the sodium ion exchanger 7, and the sodium ion exchanger 7 removes all non-monovalent anions (with knots) in the waste water scale tendency ion), then lead to nanofiltration membrane device 9 after being preheated by heater 8, nanofiltration membrane device 9 can remove the solute with a molecular size of about 1 nanometer, and the solute separated by nanofiltration membrane device 9 is frozen After the denitrification device 10 is processed, sodium sulfate decahydrate crystals are formed, and the mother liquor after the sodium sulfate decahydrate crystals are separated by a separator is returned to the nanofiltration membrane device 9 to continue circulation and separation. High-purity sodium sulfate decahydrate can be sold as an industrial raw material. The wastewater passing through the nanofiltration membrane device 9 flows to the nanofiltration water production tank 11, and then leads to the security filter 13 under the action of the first lift pump 12, and the security filter 13 is used as the pretreatment of the wastewater to the reverse osmosis seawater desalination device 14, Separation of fine particles above 1 degree in wastewater. The waste water passing through the security filter 13 leads to the reverse osmosis seawater desalination device 14, and the reverse osmosis seawater desalination device 14 separates 60% of the pure water in the waste water, and the separated pure water is recycled as industrial or domestic water. The high-concentration sodium chloride solution through the reverse osmosis seawater desalination device 14 first leads to the concentrated water tank 15, and the high-concentration sodium chloride solution leads to the falling film evaporator 17 under the effect of the second lift pump 16, and at the same time, part The high-concentration sodium chloride solution flows to the sodium ion exchanger 7 for regeneration of the sodium ion exchange bed. The falling film evaporator 17 separates the water in the concentrated sodium chloride solution to obtain a higher concentration sodium chloride solution, and the higher concentration sodium chloride solution is separated under the action of the mechanical vapor recompression device 18 Go out remaining most of water, form sodium chloride crystallization; Under the effect of centrifuge 19 and drier 20, sodium chloride crystallization forms solid salt. The desulfurization wastewater treated by this system will not discharge any wastewater, and the industrial wastewater is completely treated.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520348362.XUCN204675945U (en) | 2015-05-26 | 2015-05-26 | Desulfurization wastewater Zero discharging system |
| Application Number | Priority Date | Filing Date | Title |
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| CN201520348362.XUCN204675945U (en) | 2015-05-26 | 2015-05-26 | Desulfurization wastewater Zero discharging system |
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| CN204675945Utrue CN204675945U (en) | 2015-09-30 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201520348362.XUExpired - LifetimeCN204675945U (en) | 2015-05-26 | 2015-05-26 | Desulfurization wastewater Zero discharging system |
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| CP01 | Change in the name or title of a patent holder | Address after:100160 Beijing, Fengtai District Automobile Museum Road, No. 6, Ying Kun century A block, floor 11 Patentee after:CHINA HUADIAN ENGINEERING Co.,Ltd. Patentee after:HUADIAN WATER ENGINEERING Co.,Ltd. Address before:100160 Beijing, Fengtai District Automobile Museum Road, No. 6, Ying Kun century A block, floor 11 Patentee before:China Huadian Engineering (Group) Co.,Ltd. Patentee before:HUADIAN WATER ENGINEERING Co.,Ltd. | |
| TR01 | Transfer of patent right | Effective date of registration:20180509 Address after:100070 313, room 2, 9 Haiying Road, Science City, Fengtai District, Beijing. Patentee after:HUADIAN WATER ENGINEERING Co.,Ltd. Address before:100160 Beijing Fengtai District Automobile Museum East Road 6 hospital, Ying Kun century A block 11. Co-patentee before:HUADIAN WATER ENGINEERING Co.,Ltd. Patentee before:CHINA HUADIAN ENGINEERING Co.,Ltd. | |
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