CN112460622A - Method and system for clean utilization of fire coal - Google Patents

Abstract

Translated fromChinese

本发明公开了一种燃煤清洁利用的方法和系统。所述方法包括煤粉多点喷射制炭、分级控氧恒温燃烧，尾气再循环、高温炭脱硝、高温钙粉脱硫，再燃除碳，双级高温除尘，净烟气进入后续应用系统；所述系统包括煤粉燃烧系统和应用系统，所述煤粉燃烧系统包括顺次连接的料仓、燃烧脱硝脱硫一体化炉和双级除尘器，所述燃烧脱硝脱硫一体化炉内设有煤粉燃烧区、脱硝区和脱硫区，所述煤粉燃烧区与脱硝区串联布置，所述燃烧脱硝脱硫一体化炉设有多级喷嘴和点火装置，所述脱硫区内设置有研磨装置，所述研磨装置与电机相连，所述应用系统为民居供暖系统、烧制系统或烘干系统。本发明装置集成度高，可实现煤粉高效燃烧、脱硝、脱硫的一体化。

The invention discloses a method and a system for clean utilization of coal. The method includes multi-point injection of pulverized coal for carbon production, staged oxygen-controlled constant temperature combustion, exhaust gas recirculation, high-temperature carbon denitration, high-temperature calcium powder desulfurization, reburning and carbon removal, two-stage high-temperature dust removal, and purified flue gas entering a subsequent application system; the The system includes a pulverized coal combustion system and an application system. The pulverized coal combustion system includes sequentially connected silos, an integrated combustion, denitration and desulfurization furnace, and a two-stage dust collector. The integrated combustion, denitration and desulfurization furnace is provided with a pulverized coal combustion The pulverized coal combustion area and the denitration area are arranged in series, the combustion, denitration and desulfurization integrated furnace is provided with multi-stage nozzles and ignition devices, and the desulfurization area is provided with a grinding device. The device is connected with the motor, and the application system is a residential heating system, a firing system or a drying system. The device of the invention has a high degree of integration, and can realize the integration of efficient combustion, denitration and desulfurization of pulverized coal.

Description

Method and system for clean utilization of fire coal

Technical Field

The invention relates to utilization of fire coal, in particular to a method and a system for clean utilization of the fire coal.

Background

Coal pollution is a main source of air pollution in China, and more than 60% of dust, more than 70% of sulfur dioxide and more than 50% of nitrogen oxides in the air are related to coal combustion. The industrial boiler is the second largest coal-fired user in China, and the coal-fired quantity is more than 7 hundred million tons each year, so that the industrial boiler is one of the most energy-consuming devices. The common operation efficiency of the active small and medium sized boilers is not high, the energy waste is serious, and a large amount of smoke and SO discharged by the boilers is₂And NO_XAnd the like, which seriously endangers the health and ecological environment of human bodies. Therefore, aiming at the problems of high energy consumption, high pollution and the like in the current coal-fired industry, the method eliminates the low-efficiency coal-fired boiler, and deeply purifies and treats the coal-fired flue gas, is the key for solving the industrial coal-fired pollution, and has important significance for realizing the overall target of energy conservation and emission reduction in China.

In recent years, a great deal of literature reports and patents on the improvement and improvement of efficiency of coal-fired boilers and the flue gas purification technology exist, and China invention CN 108518672A discloses a low-nitrogen combustion circulating fluidized bed boiler which comprises a hearth, a material separating and returning device, a feeding device and a tail flue, wherein the hearth comprises a bubbling bed hearth and a fluidized bed hearth. The invention of China CN 105363340B discloses a simultaneous denitration and desulfurization active carbon dry-method flue gas purification system and a purification device, which comprise an adsorption tower, a desorption tower, a chimney, active carbon conveying equipment and active carbon screening equipment. The Chinese invention CN 104162352B discloses a dust removal, denitration and desulfurization integrated treatment process for a glass kiln, which comprises the steps of absorbing heat and cooling high-temperature flue gas of the glass kiln by a waste heat boiler, leading the high-temperature flue gas out of a temperature section of the waste heat boiler, which is cooled to 250-plus-one temperature of 300 ℃, and entering a dust removal device for dust removal; returning the flue gas with the dust removal standard to the waste heat boiler, heating to 300-420 ℃ of a temperature window of selective catalytic reduction SCR, and leading out the flue gas to enter an SCR denitration device; and continuously returning the denitrated flue gas reaching the standard to the waste heat boiler for recovering heat, and entering the wet desulphurization device when the temperature reaches about 120 +/-20 ℃. However, the flue gas which reaches the standard after the wet desulphurization treatment is discharged into the atmosphere through a chimney, the temperature is raised and reduced, and the decarbonization treatment is not carried out.

At present, coal fired boiler and flue gas are handled the majority and are concentrated on boiler transformation, denitration desulfurization technique and waste heat recovery, and most equipment is independent application, does not carry out the collaborative design, and it is big to lead to the flue gas to administer the investment, and the working costs is high, and the treatment effect influences each other. The denitration and desulfurization integrated technology commonly used at home and abroad is mainly used for wet flue gas desulfurization and denitration of SCR or SNCR technology, the denitration and desulfurization efficiency is difficult to be stabilized in a certain range due to the limitation of temperature, and in addition, certain potential safety hazards exist in transportation, storage and management when a reducing agent is a solution, so that the research and development of the process and the device for cooperatively removing multiple pollutants for medium and small-sized coal-fired flue gas desulfurization, denitration, dust removal and decarburization are imperative.

Disclosure of Invention

The invention mainly aims to provide a method and a system for clean utilization of fire coal, and aims to solve the problem that the conventional small and medium-sized fire coal flue gas desulfurization, denitration, dust removal and decarburization multi-pollutant collaborative removal process and device are lack.

The invention provides a clean utilization method of fire coal, which comprises the following steps: the method comprises the following steps of coal powder multi-point injection carbon preparation, graded oxygen control and constant temperature combustion, tail gas recirculation, high-temperature carbon denitration, high-temperature calcium powder desulfurization, carbon reburning and removal, two-stage high-temperature dust removal and clean flue gas entering a subsequent application system.

Preferably, the pulverized coal is injected into the furnace in the form of a jet.

Preferably, the denitration agent used for denitration is carbon powder prepared from coal powder or circulating carbon powder, and the desulfurizer used for desulfuration is calcium powder and fly ash.

The system for clean utilization of the coal comprises a pulverized coal combustion system and an application system, wherein the pulverized coal combustion system realizes pulverized coal multipoint injection carbon preparation and staged combustion oxygen control constant temperature, the circulating tail gas and air form combustion-supporting gas to assist denitration and desulfurization, the high-temperature gas flow after two-stage dust removal enters a subsequent application system after being combusted and decarbonized.

Preferably, the pulverized coal combustion system comprises a storage bin, a combustion denitration and desulfurization integrated furnace and a two-stage dust remover which are sequentially connected, a pulverized coal combustion area, a denitration area and a desulfurization area are arranged in the combustion denitration and desulfurization integrated furnace, the pulverized coal combustion area, the denitration area and the desulfurization area are arranged in series, the combustion denitration and desulfurization integrated furnace is provided with a multi-stage nozzle and an ignition device, a grinding device is arranged in the desulfurization area, and the grinding device is connected with a motor.

Preferably, the application system is a residential heating system, a firing system (the firing system is used for firing ceramic materials) or a drying system (the drying system is used for drying grains, marine products and the like).

Preferably, the double-stage dust remover comprises a cyclone dust remover and a metal filter bag dust remover.

Further, the device also comprises a reburning device which is arranged in front of the cyclone dust collector or behind the cyclone dust collector.

Preferably, the multistage nozzle is preferably four stages, the nozzle is used for spraying pulverized coal, calcium powder or fly ash, and an ignition device is arranged below the first stage nozzle, the second stage nozzle and the fourth stage nozzle.

Preferably, a combustion-supporting gas inlet is arranged below the combustion area.

Preferably, the residential heating system comprises a plate heat exchanger, a direct exhaust chimney, an adjusting valve, a smoke fine processing device, an air bag and an organic greenhouse which are sequentially connected, the plate heat exchanger is connected with a metal filter bag dust remover of the pulverized coal combustion system, and a reburning device of the pulverized coal combustion system is arranged in front of the cyclone dust remover; the corresponding coal clean utilization system comprises a storage bin, a combustion denitration and desulfurization integrated furnace, a reburning device, a cyclone dust collector, a metal filter bag dust collector, a plate heat exchanger, a direct discharge chimney, an adjusting valve, smoke fine treatment equipment, an air bag and an organic greenhouse which are connected in sequence.

Preferably, the firing system comprises a kiln, an induced draft fan and a direct exhaust chimney, the kiln is arranged between the reburning equipment of the pulverized coal combustion system and the metal filter bag dust remover, the metal filter bag dust remover is sequentially connected with the induced draft fan and the direct exhaust chimney, and the reburning equipment of the pulverized coal combustion system is arranged behind the cyclone dust collector; the corresponding coal clean utilization system comprises a storage bin, a combustion denitration and desulfurization integrated furnace, a cyclone dust collector, a reburning device, a kiln, a metal filter bag dust collector, an induced draft fan and a direct exhaust chimney which are connected in sequence.

Preferably, the drying system comprises an air heat exchanger, an induced draft fan and a direct exhaust chimney which are connected in sequence, wherein two sides of the air heat exchanger are respectively connected with an air blower and a drying bin, the air heat exchanger is connected with a metal filter bag dust remover of the pulverized coal combustion system, and a reburning device of the pulverized coal combustion system is arranged in front of a cyclone dust remover; the corresponding coal clean utilization system comprises a storage bin, a combustion denitration and desulfurization integrated furnace, a reburning device, a cyclone dust collector, a metal filter bag dust collector, an air heat exchanger, an induced draft fan and a direct exhaust chimney which are connected in sequence, wherein two sides of the air heat exchanger are respectively connected with an air blower and a drying bin.

In the coal clean utilization system, the pulverized coal enters a first stage to be ignited and combusted, and heat exchange and temperature rise are carried out; the coal powder and the heat-exchange and temperature-rise flue gas enter a second stage, and secondary heat exchange and temperature rise are carried out to prepare carbon powder; the flue gas, the combustion-supporting gas and the carbon powder subjected to secondary heat exchange and temperature rise enter a third stage to be fluidized and denitrated, so that each system is ensured to work under the appropriate oxygen content and temperature; the denitrated high-temperature flue gas enters a desulfurization system for desulfurization, the desulfurizer is decomposed on line, the surface of the desulfurizer is updated by forced grinding, namely, pulverized coal is subjected to multipoint injection for carbon preparation, staged combustion for oxygen control and constant temperature through a pulverized coal combustion system, combustion-supporting gas is formed by circulating tail gas and air to assist denitration and desulfurization, carbon is removed by combustion and dust removal, and the dedusted high-temperature gas flow enters a subsequent application system to realize functions of boiler heating, heat supply, kiln or drying and the like. Preferably, the denitration agent used for denitration is carbon powder, and the desulfurizer used for desulfurization consists of heavy calcium powder and burnt ash.

Compared with the prior art, the technical scheme of the invention has the beneficial effects that:

(1) compared with the prior coal-fired technology with the same scale, the clean coal-fired utilization system improves the combustion efficiency by 10 to 15 percent, reduces the generation amount of nitrogen oxides by not less than 40 percent, has the purification efficiency of the nitrogen oxides by more than 90 percent, reduces the denitration cost by more than 90 percent compared with the prior common ammonium method/ammonia method, the heat released in the denitration process can be used for heat supply, almost no secondary pollution is caused, the desulfurization efficiency is higher than 90%, fine filtration is adopted for dust removal, the content of escaping particles is lower than 10 mg/standard cubic meter, carbon dioxide discharged at the tail end of the technology can also be used as gas fertilizer of vegetable greenhouses and the like, resources are fully utilized, carbon emission is reduced, no wastewater and solid waste is discharged in the whole process, continuous denitration and desulfurization of gas are realized, zero carbon emission is realized, the treatment efficiency is high, and the problem of environmental pollution caused by coal burning is effectively solved.

(2) The pulverized coal combustion system is a multi-section combined efficient pollutant removing device including pre-combustion coal quality monitoring, low-nitrogen combustion and sulfur fixation, in-furnace denitration and desulfurization, tail flue gas desulfurization, cloth bag dedusting and desulfurization, reburning and decarburization.

Drawings

FIG. 1 is a schematic structural diagram of a coal-fired clean utilization system for residential heating according to the present invention, wherein 101. a bunker; 102. a combustion zone; 103. a denitration zone; 104. a desulfurization zone; 105. a reburning apparatus; 106. a cyclone dust collector; 107. a metal filter bag dust remover; 108. a plate heat exchanger; 109. a direct exhaust chimney; 110. adjusting the valve; 111. flue gas fine treatment equipment; 112. an air bag; 113. an organic greenhouse.

FIG. 2 is a schematic structural diagram of a clean utilization system for burning coal according to the present invention, wherein 201 is a bunker; 202. a combustion zone; 203. a denitration zone; 204. a desulfurization zone; 205. a cyclone dust collector; 206. a reburning apparatus; 207. a kiln; 208. a metal filter bag dust remover; 209. an induced draft fan; 210. and (4) directly discharging to a chimney.

FIG. 3 is a schematic structural diagram of a coal-fired clean utilization system for drying according to the present invention, wherein 301 is a bunker; 302. a combustion zone; 303. a denitration zone; 304. a desulfurization zone; 305. a reburning apparatus; 306. a cyclone dust collector; 307. a metal filter bag dust remover; 308. an air heat exchanger; 309. an induced draft fan; 310. a direct exhaust chimney; 311. a blower; 312. and (7) drying the bin.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited thereto.

As shown in fig. 1, the coal-fired clean utilization system for boiler heating comprises a storage bin 101, a combustion denitration and desulfurization integrated furnace, a reburning device 105, a cyclone dust collector 106, a metal filter bag dust collector 107, a plate heat exchanger 108, a direct-discharge chimney 109, an adjusting valve 110, a flue gas fine treatment device 111, an air bag 112 and an organic greenhouse 113 which are connected in sequence; conveying the pulverized coal into a combustion denitration and desulfurization integrated furnace through a material bin 101, and generating high-temperature flue gas in a combustion area 102 in the combustion denitration and desulfurization integrated furnace by the pulverized coal; the high-temperature flue gas sequentially passes through the denitration region 103 and the desulfurization region 104 to be subjected to denitration and desulfurization; a certain amount of grinding balls are filled in the desulfurization area 104, and a motor is used for driving the balls to move continuously, so that the flue gas is in full contact with a denitrifier desulfurizer; high-temperature smoke after denitration and desulfurizationThe gas enters the reburning equipment 105 and is reburned to generate carbon dioxide; the flue gas with denitration, desulfurization and decarburization enters a cyclone dust collector 106 and a metal filter bag dust collector 107 to be subjected to coarse dust removal and fine dust removal, so that clean flue gas is obtained; the clean flue gas is subjected to heat exchange through the gas-liquid plate heat exchanger 108, and the heat is conveyed to an area needing heating; the flue gas after heat exchange is communicated with the organic greenhouse 113 through the flue gas fine treatment equipment 111 and the pressure stabilizing function of the air bag 112. The invention has established a set of 30kg/h coal-fired system demonstration line, improves the combustion efficiency by 10 to 15 percent compared with the prior coal-fired technology with the same scale, and the content of nitrogen oxides, sulfur oxides and particulate matters after combustion is lower than 10mg/m³The heat exchange efficiency is more than 90 percent and is far lower than the new standard of the boiler atmospheric pollutant emission.

As shown in fig. 2, the coal clean utilization system for firing comprises a storage bin 201, a combustion denitration and desulfurization integrated furnace, a cyclone dust collector 205, a reburning device 206, a kiln 207, a metal filter bag dust collector 208, an induced draft fan 209 and a direct discharge chimney 210 which are connected in sequence; pulverized coal is conveyed into the combustion denitration and desulfurization integrated furnace through a material bin 201, and the pulverized coal generates high-temperature flue gas in a combustion area 202 in the combustion denitration and desulfurization integrated furnace; the high-temperature flue gas sequentially passes through the denitration region 203 and the desulfurization region 204 to be subjected to denitration and desulfurization; a certain amount of grinding balls are filled in the desulfurization area 204, and a motor is used for driving the balls to move continuously, so that the flue gas is in full contact with a desulfurizer denitration agent; the denitrated and desulfurized high-temperature flue gas enters the cyclone dust collector 205 for coarse dust removal; the flue gas after coarse dust removal enters a reburning device 206, natural gas is introduced to further burn carbon monoxide which is not completely burned, the flue gas after temperature rise is introduced into a kiln 207 for production, and the flue gas enters a metal filter bag dust collector 208 for fine dust removal and is discharged into air from a direct chimney 210 through an induced draft fan 209.

As shown in fig. 3, the coal cleaning and utilizing system for drying includes a bunker 301, a combustion denitration and desulfurization integrated furnace, a reburning device 305, a cyclone dust collector 306, a metal filter bag dust collector 307, an air heat exchanger 308, an induced draft fan 309 and a direct discharge chimney 310 which are connected in sequence, and both sides of the air heat exchanger 308 are respectively connected with an air blower 311 and a drying bunker 312; coal dust removerThe material passing bin 301 is conveyed into the combustion denitration and desulfurization integrated furnace, and the pulverized coal generates high-temperature flue gas in a combustion area 302 in the combustion denitration and desulfurization integrated furnace; the high-temperature flue gas sequentially passes through the denitration region 303 and the desulfurization region 304 to be subjected to denitration and desulfurization; a certain amount of grinding balls are filled in the desulfurization area 304, and a motor is used for driving the balls to move continuously, so that the flue gas is in full contact with a desulfurizer denitration agent; the denitrated and desulfurized high-temperature flue gas enters the reburning equipment 305 and is reburned to generate carbon dioxide; the flue gas with denitration, desulfurization and decarburization enters a cyclone dust collector 306 and a metal filter bag dust collector 307 to be subjected to coarse dust removal and fine dust removal, so that clean flue gas is obtained; the clean flue gas is subjected to heat exchange through the air heat exchanger 308, heat is conveyed to the drying bin 312 through the blower 311, and the clean high-temperature gas is recycled in the closed drying bin 312. The invention has established a set of 30kg/h coal-fired system demonstration line, improves the combustion efficiency by 10 to 15 percent compared with the prior coal-fired technology with the same scale, and the content of nitrogen oxides, sulfur oxides and particulate matters after combustion is lower than 10mg/m³The heat exchange efficiency is more than 90 percent and is far lower than the new standard of the boiler atmospheric pollutant emission.

Claims (10)

Translated fromChinese

1.一种燃煤清洁利用的方法，其特征在于，包括：煤粉多点喷射制炭、分级控氧恒温燃烧，尾气再循环、高温炭脱硝、高温钙粉脱硫，再燃除碳，双级高温除尘，净烟气进入后续应用系统。1. a method for clean utilization of coal, it is characterized in that, comprising: coal powder multi-point injection charcoal, graded oxygen control constant temperature combustion, exhaust gas recirculation, high temperature carbon denitrification, high temperature calcium powder desulfurization, reburning decarbonization, two-stage High temperature dust removal, clean flue gas enters the subsequent application system.2.根据权利要求1所述的燃煤清洁利用的方法，其特征在于，所述煤粉以喷射流形式喷入炉内；脱硝所用的脱硝剂为煤粉制备的炭粉或循环炭粉，脱硫所用的脱硫剂为钙粉和粉煤灰。2 . The method for clean utilization of coal according to claim 1 , wherein the pulverized coal is sprayed into the furnace in the form of a jet stream; the denitrification agent used for denitrification is pulverized carbon prepared from pulverized coal or recycled pulverized carbon, 3 . The desulfurizers used for desulfurization are calcium powder and fly ash.3.一种燃煤清洁利用系统，其特征在于，包括煤粉燃烧系统和应用系统，所述煤粉燃烧系统实现煤粉多点喷射制炭、分级燃烧控氧恒温，循环尾气与空气形成助燃气体协助脱硝脱硫，再燃除碳和除尘，除尘后的高温气流进入后续应用系统中。3. A coal-fired clean utilization system, characterized in that it comprises a pulverized coal combustion system and an application system, wherein the pulverized coal combustion system realizes multi-point injection of pulverized coal to make charcoal, staged combustion to control oxygen at a constant temperature, and the circulating exhaust gas and air form a combustion-supporting system. The gas assists in denitration and desulfurization, reburning and carbon removal and dust removal, and the high temperature air flow after dust removal enters the subsequent application system.4.根据权利要求3所述的燃煤清洁利用系统，其特征在于，所述煤粉燃烧系统包括顺次连接的料仓、燃烧脱硝脱硫一体化炉和双级除尘器，所述燃烧脱硝脱硫一体化炉内设有煤粉燃烧区、脱硝区和脱硫区，所述煤粉燃烧区、脱硝区、脱硫区串联布置，所述燃烧脱硝脱硫一体化炉设有多级喷嘴和点火装置，所述脱硫区内设置有研磨装置，所述研磨装置与电机相连。4 . The coal-fired clean utilization system according to claim 3 , wherein the pulverized coal combustion system comprises a silo, a combustion-denitrification-desulfurization integrated furnace, and a two-stage dust collector, which are connected in sequence. The integrated furnace is provided with a pulverized coal combustion area, a denitration area and a desulfurization area, and the pulverized coal combustion area, the denitration area, and the desulfurization area are arranged in series. A grinding device is arranged in the desulfurization zone, and the grinding device is connected with a motor.5.根据权利要求4所述的燃煤清洁利用系统，其特征在于，所述应用系统为民居供暖系统、烧制系统或烘干系统。5 . The coal-fired clean utilization system according to claim 4 , wherein the application system is a residential heating system, a firing system or a drying system. 6 .6.根据权利要求4所述的燃煤清洁利用系统，其特征在于，所述双级除尘器包括旋风除尘器和金属滤袋除尘器。6 . The coal-fired cleaning and utilization system according to claim 4 , wherein the two-stage dust collector comprises a cyclone dust collector and a metal filter bag dust collector. 7 .7.根据权利要求6所述的燃煤清洁利用系统，其特征在于，还包括再燃设备，所述再燃设备设置于旋风除尘器之前或旋风除尘器之后；所述多级喷嘴为四级，所述喷嘴用于喷入煤粉、钙粉或粉煤灰，一、二、四级喷嘴下设有点火装置；所述燃烧区下方设有助燃气进口。7 . The coal-fired cleaning and utilization system according to claim 6 , further comprising reburning equipment, the reburning equipment is arranged before the cyclone dust collector or after the cyclone dust collector; the multi-stage nozzle is four-stage, so the The nozzle is used for injecting pulverized coal, calcium powder or fly ash, an ignition device is arranged under the first, second and fourth stage nozzles; a combustion gas inlet is arranged under the combustion zone.8.根据权利要求5所述的燃煤清洁利用系统，其特征在于，所述民居供暖系统包括顺次连接的板式换热器、直排烟囱、调节阀门、烟气精处理设备、气囊和有机大棚，所述板式换热器与煤粉燃烧系统的金属滤袋除尘器连接，所述煤粉燃烧系统的再燃设备设置于旋风除尘器之前；此时对应的燃煤清洁利用系统包括顺次连接的料仓、燃烧脱硝脱硫一体化炉、再燃设备、旋风除尘器、金属滤袋除尘器、板式换热器、直排烟囱、调节阀门、烟气精处理设备、气囊和有机大棚。8 . The coal-fired clean utilization system according to claim 5 , wherein the residential heating system comprises plate heat exchangers, straight exhaust chimneys, regulating valves, flue gas polishing equipment, air bags and organic In the greenhouse, the plate heat exchanger is connected to the metal filter bag dust collector of the pulverized coal combustion system, and the reburning equipment of the pulverized coal combustion system is arranged before the cyclone dust collector; at this time, the corresponding coal cleaning and utilization system includes sequential connections silo, combustion denitration and desulfurization integrated furnace, reburning equipment, cyclone dust collector, metal filter bag dust collector, plate heat exchanger, straight exhaust chimney, regulating valve, flue gas polishing equipment, air bag and organic greenhouse.9.根据权利要求5所述的燃煤清洁利用系统，其特征在于，所述烧制系统包括窑炉、引风机和直排烟囱，所述窑炉设置于煤粉燃烧系统的再燃设备和金属滤袋除尘器之间，金属滤袋除尘器再顺次连接引风机和直排烟囱，所述煤粉燃烧系统的再燃设备设置于旋风除尘器之后；此时对应的燃煤清洁利用系统包括顺次连接的料仓、燃烧脱硝脱硫一体化炉、旋风除尘器、再燃设备、窑炉、金属滤袋除尘器、引风机和直排烟囱。9 . The coal-fired clean utilization system according to claim 5 , wherein the firing system comprises a kiln, an induced draft fan and a straight exhaust chimney, and the kiln is arranged on the reburning equipment and the metal of the pulverized coal combustion system. 10 . Between the filter bag filter, the metal filter bag filter is connected to the induced draft fan and the straight exhaust chimney in sequence, and the reburning equipment of the pulverized coal combustion system is arranged after the cyclone filter; Secondary connected silo, combustion, denitrification and desulfurization integrated furnace, cyclone dust collector, reburning equipment, kiln, metal filter bag dust collector, induced draft fan and straight exhaust chimney.10.根据权利要求5所述的燃煤清洁利用系统，其特征在于，所述烘干系统包括顺次连接的空气换热器，引风机、直排烟囱，所述空气换热器的两侧分别连接鼓风机和烘干仓，所述空气换热器与煤粉燃烧系统的金属滤袋除尘器连接，所述煤粉燃烧系统的再燃设备设置于旋风除尘器之前；此时对应的燃煤清洁利用系统包括顺次连接的料仓、燃烧脱硝脱硫一体化炉、再燃设备、旋风除尘器、金属滤袋除尘器、空气换热器、引风机和直排烟囱，所述空气换热器的两侧分别连接鼓风机和烘干仓。10. The coal-fired cleaning and utilization system according to claim 5, wherein the drying system comprises an air heat exchanger, an induced draft fan, and a straight exhaust chimney connected in sequence, and two sides of the air heat exchanger are connected in sequence. The blower and the drying bin are respectively connected, the air heat exchanger is connected with the metal filter bag dust collector of the pulverized coal combustion system, and the reburning equipment of the pulverized coal combustion system is arranged before the cyclone dust collector; at this time, the corresponding coal combustion is clean The utilization system includes sequentially connected silo, combustion, denitrification and desulfurization integrated furnace, reburning equipment, cyclone dust collector, metal filter bag dust collector, air heat exchanger, induced draft fan and straight exhaust chimney. The sides are respectively connected to the blower and the drying chamber.

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