Coal gasification unorganized exhaust gas collecting and recycling system and method thereof

Abstract

The invention discloses a coal gasification unorganized exhaust gas collecting and recycling system which comprises a tail gas absorption tower, the input end of the tail gas absorption tower is connected with a coal gasification gas conveying unit and a sodium hydroxide reactant unit through pipelines, and the output end of the tail gas absorption tower is connected with a sulfur recycling unit through a pipeline. The tail gas absorption tower is also connected with a heat exchange unit; and the heat exchange unit is connected with a treatment unit through a pipeline. The invention further discloses a coal gasification unorganized exhaust gas collecting and recycling method. According to the system and the method for collecting and recycling the coal gasification unorganized exhaust gas, the problems of repeated equipment investment, high operation cost and high operation environmental protection pressure caused by separate treatment in traditional coal gasification unorganized exhaust gas recycling are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gasification unorganized emission gas collection equipment, and specifically relates to a gasification unorganized emission gas collection, recovery and utilization system, and also relates to a gasification unorganized emission gas collection, recovery and utilization method. Background Art

[0002] At present, there are two major pain points in the recovery and utilization of gasification unorganized emission gases: one is that the water slurry preparation wastewater in coal gasification is rich in volatile organic compounds (VOCs), mercaptans, ammonia and other odor-causing substances. Traditional aeration treatment is likely to cause the diffusion of odors, affecting the air quality of the surrounding area, triggering complaints from residents, and at the same time affecting the physical and mental health of workers; the other is that the slagging machine's scattered gas contains CO≥500ppm, H2S≥200ppm, NH3≥1000ppm. Direct emission violates the "Pollutant Discharge Standards for the Petroleum Chemical Industry" (GB31571-2015) and poses a threat to environmental safety. Existing technologies adopt a separate treatment method for these two gases, which has many disadvantages, such as repeated investment in equipment, the need to separately purchase wastewater aeration equipment and waste gas purification devices, increasing capital costs and floor area; high operating costs, the wastewater aeration system and the waste gas purification system operate independently, and the energy consumption and chemical consumption are superimposed, resulting in high long-term costs; high operating environmental pressure, it is difficult to completely eliminate VOCs and mercaptans in wastewater aeration treatment, and malfunctions in the waste gas purification system may cause environmental accidents, and enterprises need to separately deal with two sets of environmental protection supervision systems for wastewater and waste gas, increasing management complexity and violation risks; in addition, the resource recovery efficiency is low. Traditional separate treatment focuses on the up-to-standard discharge of pollutants, and the recovery rate of valuable components in the gas is insufficient, resulting in waste of resources. Summary of the Invention

[0003] The purpose of the present invention is to provide a gasification unorganized emission gas collection, recovery and utilization system, which solves the problems of separate treatment in the traditional gasification unorganized emission gas recovery and utilization, resulting in repeated investment in equipment, high operating costs, and high operating environmental pressure.

[0004] Another purpose of the present invention is to provide a gasification unorganized emission gas collection, recovery and utilization method.

[0005] The technical solution adopted by the present invention is that a gasification unorganized emission gas collection, recovery and utilization system includes a tail gas absorption tower. The input end of the tail gas absorption tower is respectively connected with a coal gasification gas transmission unit and a sodium hydroxide reactant unit through pipelines. The output end of the tail gas absorption tower is connected with a sulfur recovery unit through a pipeline. A heat exchange unit is also connected to the tail gas absorption tower, and the heat exchange unit is connected with a treatment unit through a pipeline.

[0006] The characteristics of the present invention also lie in: The coal gasification gas transmission unit includes a rod mill, which is connected to the tail gas absorption tower through a pipeline. There is a rod mill exhaust fan on the pipeline between the rod mill and the tail gas absorption tower. It also includes a slag extractor, which is connected to the tail gas absorption tower through a pipeline. There is a slag extractor exhaust fan on the pipeline between the slag extractor and the tail gas absorption tower. It further includes a water coal slurry additive preparation tank, which is connected to the tail gas absorption tower through a pipeline. There is an additive preparation tank induced draft fan on the pipeline between the water coal slurry additive preparation tank and the tail gas absorption tower. It also includes an additive storage tank, which is connected to the tail gas absorption tower through a pipeline. There is an additive storage tank induced draft fan on the pipeline between the additive storage tank and the tail gas absorption tower. It further includes an ammonia-containing tail gas pipe, which is connected to the tail gas absorption tower through a pipeline.

[0007] The tail gas absorption tower is also connected to a low-pressure ash water pump through a pipeline. There is a tail gas water washing tower liquid level regulating valve on the pipeline between the low-pressure ash water pump and the tail gas absorption tower. There is a tail gas water washing tower bottom pH meter on the tail gas absorption tower.

[0008] The sulfur recovery unit includes a sulfur recovery device, which is connected to the tail gas absorption tower through a pipeline. The sulfur recovery device is connected to the top of the tail gas absorption tower through a pipeline. There is an induced draft fan on the pipeline between the sulfur recovery device and the tail gas absorption tower.

[0009] The heat exchange unit includes an absorption water heat exchanger. The input end of the absorption water heat exchanger is connected to a circulating cooling water pipe through a pipeline. The output end of the absorption water heat exchanger is connected to the tail gas absorption tower through a pipeline. There is an upper packing of the tail gas water washing tower fixedly connected inside the tail gas absorption tower. The output end of the absorption water heat exchanger is connected to the upper packing of the tail gas water washing tower through a pipeline. There is a lower packing of the tail gas water washing tower fixedly connected inside the tail gas absorption tower at the bottom of the upper packing of the tail gas water washing tower. The lower packing of the tail gas water washing tower is connected to the pipeline between the absorption water heat exchanger and the tail gas absorption tower through a pipeline. The bottom output end of the tail gas absorption tower is connected to the absorption water heat exchanger through a return water pipeline. There is an absorption water pump on the return water pipeline. There is an ammonia concentration meter on the return water pipeline between the absorption water pump and the absorption water heat exchanger. The return water pipeline is connected to the treatment unit through a pipeline between the ammonia concentration meter and the absorption water heat exchanger.

[0010] The sodium hydroxide reactant unit includes a sodium hydroxide solution storage tank, which is connected to the tail gas absorption tower through a pipeline. There is a sodium hydroxide solution metering pump on the pipeline between the sodium hydroxide solution storage tank and the tail gas absorption tower. The connection port of the pipeline between the sodium hydroxide solution storage tank and the tail gas absorption tower on the tail gas absorption tower is located between the connection port of the pipeline between the coal gasification gas transmission unit and the tail gas absorption tower on the tail gas absorption tower and the lower packing of the tail gas water washing tower.

[0011] The connection ports of the pipelines between the rod mill and the tail gas absorption tower, the pipelines between the slag scraper and the tail gas absorption tower, the pipelines between the water coal slurry additive preparation tank and the tail gas absorption tower, the pipelines between the additive storage tank and the tail gas absorption tower, and the pipelines between the ammonia-containing tail gas pipe and the tail gas absorption tower on the tail gas absorption tower are all lower than the lower packing layer of the tail gas washing tower.

[0012] Both the upper packing layer and the lower packing layer of the tail gas washing tower are selected from one of structured packing, Pall ring packing, and Raschig ring packing.

[0013] The treatment unit includes a sewage treatment device, an ammonia water concentration improvement device, and an organic farm. The sewage treatment device, the ammonia water concentration improvement device, and the organic farm are arranged in parallel. The sewage treatment device, the ammonia water concentration improvement device, and the organic farm are jointly connected to the return water pipeline between the ammonia concentration meter and the absorption water heat exchanger through a treatment pipeline. A solution external delivery flow regulating valve is provided on the treatment pipeline. A sewage treatment delivery valve is provided on the pipeline at the entrance of the sewage treatment device. An ammonia water concentration improvement delivery valve is provided on the pipeline at the entrance of the ammonia water concentration improvement device. An organic farm delivery valve is provided on the pipeline at the entrance of the organic farm.

[0014] Another technical solution adopted by the present invention is a method for collecting, recycling, and utilization of unorganized emission gas from coal gasification, including the following steps: S1. The coal gasification gas in the rod mill, the slag scraper, the water coal slurry additive preparation tank, and the additive storage tank is transported to the bottom of the tail gas absorption tower through pipelines. S2. After receiving the coal gasification gas, the tail gas absorption tower transports the sodium hydroxide solution in the sodium hydroxide solution storage tank to the tail gas absorption tower through a sodium hydroxide solution metering pump. At the same time, the absorption water heat exchanger sprays the cooling water from the top of the absorption tower layer by layer through the upper packing layer and the lower packing layer of the tail gas washing tower, and fully mixes and reacts with the water gas. S3. The gas after the mixing reaction rises to the top of the tail gas absorption tower and is transported to the sulfur recovery device for recovery through a induced draft fan. The mixed ammonia water liquid is circulated, cooled, and diluted through the absorption water heat exchanger. S4. After the ammonia concentration meter detects that the ammonia water liquid is qualified, the solution external delivery flow regulating valve is opened, and the ammonia water liquid is transported to the sewage treatment device, the ammonia water concentration improvement device, or the organic farm for treatment by starting or stopping the sewage treatment delivery valve, the ammonia water concentration improvement delivery valve, or the organic farm delivery valve.

[0015] The beneficial effects of the present invention are: The gasification unorganized emission gas collection, recovery and utilization system and method provided by the present invention realize the synchronous recovery and utilization of different gases in the gasification process, and have significant beneficial effects: on the one hand, by simultaneously treating two gases, valuable components such as sulfur in CO and H2S can be recovered more efficiently, and the resource recovery rate is increased by more than 50% compared with the traditional separate treatment method, reducing resource waste; on the other hand, the integrated treatment system reduces the repeated purchase of equipment, reduces the initial investment cost, and also reduces the long-term operation energy consumption and reagent consumption due to the coordinated operation of the equipment, and the operation cost is reduced by more than 30%. In addition, the integrated system is designed compactly, optimizing the equipment layout, reducing the floor area, and further reducing the overall energy consumption through energy recovery and process coordination; the unified control system makes the operation more convenient, reduces the risk of human error, and improves the stability and reliability of the system. More importantly, through synchronous purification and recovery, the emissions of pollutants such as VOCs, mercaptans, CO, H2S and NH3 are effectively reduced, ensuring stable compliance of waste gas emissions, reducing the risk of environmental protection violations, and at the same time reducing the escape risk of gas during the treatment process, reducing the impact on the surrounding environment, and improving the safety of the production process. The present invention reduces the dependence on external resources and reduces carbon emissions by efficiently recovering and reusing valuable components in the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the gasification unorganized emission gas collection, recovery and utilization system of the present invention.

[0017] In the figure, 1. rod mill, 2. rod mill exhaust fan, 3. slag extractor, 4. slag extractor exhaust fan, 5. coal water slurry additive preparation tank, 6. additive preparation tank induced draft fan, 7. additive storage tank, 8. additive storage tank induced draft fan, 9. upper packing of tail gas water washing tower, 10. lower packing of tail gas water washing tower, 11. low-pressure ash water pump, 12. tail gas water washing tower liquid level regulating valve, 13. tail gas water washing tower bottom pH meter, 14. sodium hydroxide solution metering pump, 15. sodium hydroxide solution storage tank, 16. absorption water pump, 17. absorption water heat exchanger, 18. induced draft fan, 19. sulfur recovery device, 20. solution external delivery flow regulating valve, 21. ammonia concentration meter, 22. sewage treatment device, 23. ammonia water concentration increasing device, 24. organic farm, 25. ammonia-containing tail gas pipe, 26. circulating cooling water pipe, 27. tail gas absorption tower, 28. sewage treatment conveying valve, 29. ammonia water concentration increasing conveying valve, 30. organic farm conveying valve. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The gasification unorganized emission gas collection, recovery and utilization system provided by the present invention, such asFigure 1As shown in the figure, it includes a tail gas absorption tower 27. The pressure range of the tail gas absorption tower 27 is -5 KPa to 10 KPa, which is used to react and absorb the coal gasification gas. The input end of the tail gas absorption tower 27 is respectively connected with a coal gasification gas delivery unit and a sodium hydroxide reactant unit through pipelines. The output end of the tail gas absorption tower 27 is connected with a sulfur recovery unit through a pipeline. A heat exchange unit is also connected to the tail gas absorption tower 27. The temperature of the heat exchange unit is controlled at 35 - 45 °C, and the heat exchange unit is connected with a treatment unit through a pipeline; The coal gasification gas delivery unit includes a rod mill 1. The rod mill 1 is connected with the tail gas absorption tower 27 through a pipeline, and a rod mill exhaust fan 2 is provided on the pipeline between the rod mill 1 and the tail gas absorption tower 27; It also includes a slag extractor 3. The slag extractor 3 is connected with the tail gas absorption tower 27 through a pipeline, and a slag extractor exhaust fan 4 is provided on the pipeline between the slag extractor 3 and the tail gas absorption tower 27; It also includes a water coal slurry additive preparation tank 5. The water coal slurry additive preparation tank 5 is connected with the tail gas absorption tower 27 through a pipeline, and an additive preparation tank induced draft fan 6 is provided on the pipeline between the water coal slurry additive preparation tank 5 and the tail gas absorption tower 27; It also includes an additive storage tank 7. The additive storage tank 7 is connected with the tail gas absorption tower 27 through a pipeline, and an additive storage tank induced draft fan 8 is provided on the pipeline between the additive storage tank 7 and the tail gas absorption tower 27; It also includes an ammonia-containing tail gas pipe 25. The ammonia-containing tail gas pipe 25 is connected with the tail gas absorption tower 27 through a pipeline; The tail gas absorption tower 27 is also connected with a low-pressure ash water pump 11 through a pipeline, and a tail gas water washing tower liquid level regulating valve 12 is provided on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27. When the pressure of the tail gas absorption tower 27 is insufficient, pressure is supplemented into the tail gas absorption tower 27 through the low-pressure ash water pump 11 and the tail gas water washing tower liquid level regulating valve 12. A tail gas water washing tower bottom PH meter 13 is provided on the tail gas absorption tower 27 to ensure that the PH value in the pipeline at the tail gas water washing tower liquid level regulating valve 12 is controlled at 10 - 12, which is convenient for real-time measurement of the PH value of the reaction in the tail gas absorption tower 27; The sulfur recovery unit includes a sulfur recovery device 19. The sulfur recovery device 19 is connected with the tail gas absorption tower 27 through a pipeline. The sulfur recovery device 19 is connected to the top of the tail gas absorption tower 27 through a pipeline, and an induced draft fan 18 is provided on the pipeline between the sulfur recovery device 19 and the tail gas absorption tower 27;The heat exchange unit includes an absorption water heat exchanger 17. The input end of the absorption water heat exchanger 17 is connected by a pipeline to a circulating cooling water pipe 26 to facilitate the supply of cooling water. The output end of the absorption water heat exchanger 17 is connected to a tail gas absorption tower 27 by a pipeline. An upper packing 9 of the tail gas water washing tower is fixedly connected inside the tail gas absorption tower 27. The output end of the absorption water heat exchanger 17 is connected to the upper packing 9 of the tail gas water washing tower by a pipeline. At the bottom of the upper packing 9 of the tail gas water washing tower, a lower packing 10 of the tail gas water washing tower is fixedly connected inside the tail gas absorption tower 27 to facilitate increasing the contact area with the coal gasification gas through two layers. The lower packing 10 of the tail gas water washing tower is connected to the pipeline between the absorption water heat exchanger 17 and the tail gas absorption tower 27 by a pipeline. The bottom output end of the tail gas absorption tower 27 is connected to the absorption water heat exchanger 17 by a return water pipeline. An absorption water pump 16 is provided on the return water pipeline. An ammonia concentration meter 21 is provided on the return water pipeline between the absorption water pump 16 and the absorption water heat exchanger 17. The pipeline on the return water pipeline between the ammonia concentration meter 21 and the absorption water heat exchanger 17 is connected to the treatment unit by a pipeline; the sodium hydroxide reactant unit includes a sodium hydroxide solution storage tank 15. The sodium hydroxide solution storage tank 15 is connected to the tail gas absorption tower 27 by a pipeline. A sodium hydroxide solution metering pump 14 is provided on the pipeline between the sodium hydroxide solution storage tank 15 and the tail gas absorption tower 27. The connection port of the pipeline between the sodium hydroxide solution storage tank 15 and the tail gas absorption tower 27 on the tail gas absorption tower 27 is located between the connection port of the pipeline between the coal gasification gas delivery unit and the tail gas absorption tower 27 on the tail gas absorption tower 27 and the lower packing 10 of the tail gas water washing tower; the connection port of the pipeline between the rod mill 1 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection port of the pipeline between the slag scraper 3 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection port of the pipeline between the coal water slurry additive preparation tank 5 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection port of the pipeline between the additive storage tank 7 and the tail gas absorption tower 27 on the tail gas absorption tower 27, and the connection port of the pipeline between the ammonia-containing tail gas pipe 25 and the tail gas absorption tower 27 on the tail gas absorption tower 27 are all lower than the lower packing 10 of the tail gas water washing tower; both the upper packing 9 and the lower packing 10 of the tail gas water washing tower are selected from one of structured packing, Pall rings, and Raschig rings; the treatment unit includes a sewage treatment device 22, an ammonia water concentration enhancement device 23, and an organic farm 24. The sewage treatment device 22, the ammonia water concentration enhancement device 23, and the organic farm 24 are arranged in parallel. The sewage treatment device 22, the ammonia water concentration enhancement device 23, and the organic farm 24 are jointly connected to the return water pipeline between the ammonia concentration meter 21 and the absorption water heat exchanger 17 by a treatment pipeline. A solution external delivery flow regulating valve 20 is provided on the treatment pipeline. A sewage treatment delivery valve 28 is provided on the pipeline at the inlet of the sewage treatment device 22. An ammonia water concentration enhancement delivery valve 29 is provided on the pipeline at the inlet of the ammonia water concentration enhancement device 23. An organic farm delivery valve 30 is provided on the pipeline at the inlet of the organic farm 24. When the ammonia concentration meter 21 detects a concentration of 2% - 5%, it is taken out by adjusting the solution external delivery flow regulating valve 20.;

[0020] Example 1 The gasification unorganized emission gas collection, recovery and utilization system proposed in this embodiment is shown as follows Figure 1 shown, which includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is respectively connected with a coal gasification gas conveying unit and a sodium hydroxide reactant unit through pipelines. The output end of the tail gas absorption tower 27 is connected with a sulfur recovery unit through a pipeline. A heat exchange unit is also connected to the tail gas absorption tower 27, and the heat exchange unit is connected with a treatment unit through a pipeline; The coal gasification gas conveying unit includes a rod mill 1, and the rod mill 1 is connected with the tail gas absorption tower 27 through a pipeline. A rod mill exhaust fan 2 is provided on the pipeline between the rod mill 1 and the tail gas absorption tower 27; It also includes a slag extractor 3, and the slag extractor 3 is connected with the tail gas absorption tower 27 through a pipeline. A slag extractor exhaust fan 4 is provided on the pipeline between the slag extractor 3 and the tail gas absorption tower 27; It also includes a water coal slurry additive preparation tank 5, and the water coal slurry additive preparation tank 5 is connected with the tail gas absorption tower 27 through a pipeline. An additive preparation tank induced draft fan 6 is provided on the pipeline between the water coal slurry additive preparation tank 5 and the tail gas absorption tower 27; It also includes an ammonia-containing tail gas pipe 25, and the ammonia-containing tail gas pipe 25 is connected with the tail gas absorption tower 27 through a pipeline.

[0021] Example 2 The gasification unorganized emission gas collection, recovery and utilization system proposed in this embodiment is shown as follows Figure 1As shown in the figure, it includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is respectively connected to a coal gasification gas transportation unit and a sodium hydroxide reactant unit through pipelines. The output end of the tail gas absorption tower 27 is connected to a sulfur recovery unit through a pipeline. A heat exchange unit is also connected to the tail gas absorption tower 27, and the heat exchange unit is connected to a treatment unit through a pipeline; The coal gasification gas transportation unit includes a rod mill 1. The rod mill 1 is connected to the tail gas absorption tower 27 through a pipeline, and a rod mill exhaust fan 2 is provided on the pipeline between the rod mill 1 and the tail gas absorption tower 27; It also includes a slag scraper 3. The slag scraper 3 is connected to the tail gas absorption tower 27 through a pipeline, and a slag scraper exhaust fan 4 is provided on the pipeline between the slag scraper 3 and the tail gas absorption tower 27; It also includes a water coal slurry additive preparation tank 5. The water coal slurry additive preparation tank 5 is connected to the tail gas absorption tower 27 through a pipeline, and an additive preparation tank induced draft fan 6 is provided on the pipeline between the water coal slurry additive preparation tank 5 and the tail gas absorption tower 27; It also includes an additive storage tank 7. The additive storage tank 7 is connected to the tail gas absorption tower 27 through a pipeline, and an additive storage tank induced draft fan 8 is provided on the pipeline between the additive storage tank 7 and the tail gas absorption tower 27; It also includes an ammonia-containing tail gas pipe 25. The ammonia-containing tail gas pipe 25 is connected to the tail gas absorption tower 27 through a pipeline; The tail gas absorption tower 27 is also connected to a low-pressure ash water pump 11 through a pipeline. A tail gas washing tower liquid level regulating valve 12 is provided on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27, and a tail gas washing tower bottom pH meter 13 is provided on the tail gas absorption tower 27; The sulfur recovery unit includes a sulfur recovery device 19. The sulfur recovery device 19 is connected to the tail gas absorption tower 27 through a pipeline. The sulfur recovery device 19 is connected to the top of the tail gas absorption tower 27 through a pipeline, and an induced draft fan 18 is provided on the pipeline between the sulfur recovery device 19 and the tail gas absorption tower 27.

[0022] Example 3 The coal gasification fugitive emission gas collection, recovery and utilization system proposed in this example is as Figure 1As shown in the figure, it includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is respectively connected with a coal gasification gas delivery unit and a sodium hydroxide reactant unit through pipelines. The output end of the tail gas absorption tower 27 is connected with a sulfur recovery unit through a pipeline. A heat exchange unit is also connected to the tail gas absorption tower 27, and the heat exchange unit is connected with a treatment unit through a pipeline; The coal gasification gas delivery unit includes a rod mill 1. The rod mill 1 is connected with the tail gas absorption tower 27 through a pipeline, and a rod mill exhaust fan 2 is provided on the pipeline between the rod mill 1 and the tail gas absorption tower 27; It also includes a slag extractor 3. The slag extractor 3 is connected with the tail gas absorption tower 27 through a pipeline, and a slag extractor exhaust fan 4 is provided on the pipeline between the slag extractor 3 and the tail gas absorption tower 27; It also includes a water coal slurry additive preparation tank 5. The water coal slurry additive preparation tank 5 is connected with the tail gas absorption tower 27 through a pipeline, and an additive preparation tank induced draft fan 6 is provided on the pipeline between the water coal slurry additive preparation tank 5 and the tail gas absorption tower 27; It also includes an additive storage tank 7. The additive storage tank 7 is connected with the tail gas absorption tower 27 through a pipeline, and an additive storage tank induced draft fan 8 is provided on the pipeline between the additive storage tank 7 and the tail gas absorption tower 27; It also includes an ammonia-containing tail gas pipe 25. The ammonia-containing tail gas pipe 25 is connected with the tail gas absorption tower 27 through a pipeline; The tail gas absorption tower 27 is also connected with a low-pressure ash water pump 11 through a pipeline. A tail gas washing tower liquid level regulating valve 12 is provided on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27, and a tail gas washing tower bottom pH meter 13 is provided on the tail gas absorption tower 27; The sulfur recovery unit includes a sulfur recovery device 19. The sulfur recovery device 19 is connected with the tail gas absorption tower 27 through a pipeline. The sulfur recovery device 19 is connected to the top of the tail gas absorption tower 27 through a pipeline, and an induced draft fan 18 is provided on the pipeline between the sulfur recovery device 19 and the tail gas absorption tower 27; The heat exchange unit includes an absorption water heat exchanger 17. The input end of the absorption water heat exchanger 17 is connected with a circulating cooling water pipe 26 through a pipeline, and the output end of the absorption water heat exchanger 17 is connected with the tail gas absorption tower 27 through a pipeline. An upper packing layer 9 of the tail gas washing tower is fixedly connected inside the tail gas absorption tower 27. The output end of the absorption water heat exchanger 17 is connected with the upper packing layer 9 of the tail gas washing tower through a pipeline. A lower packing layer 10 of the tail gas washing tower is fixedly connected at the bottom of the upper packing layer 9 of the tail gas washing tower inside the tail gas absorption tower 27. The lower packing layer 10 of the tail gas washing tower is connected to the pipeline between the absorption water heat exchanger 17 and the tail gas absorption tower 27 through a pipeline. The bottom output end of the tail gas absorption tower 27 is connected with the absorption water heat exchanger 17 through a return water pipeline. An absorption water pump 16 is provided on the return water pipeline, an ammonia concentration meter 21 is provided on the return water pipeline between the absorption water pump 16 and the absorption water heat exchanger 17, and the pipeline between the ammonia concentration meter 21 and the absorption water heat exchanger 17 on the return water pipeline is connected with the treatment unit through a pipeline.

[0023] Example 4 The coal gasification fugitive emission gas collection, recovery and utilization system proposed in this embodiment is as Figure 1As shown in the figure, it includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is respectively connected to a coal gasification gas transmission unit and a sodium hydroxide reactant unit through pipelines. The output end of the tail gas absorption tower 27 is connected to a sulfur recovery unit through a pipeline. A heat exchange unit is also connected to the tail gas absorption tower 27, and the heat exchange unit is connected to a treatment unit through a pipeline; The coal gasification gas transmission unit includes a rod mill 1. The rod mill 1 is connected to the tail gas absorption tower 27 through a pipeline, and a rod mill exhaust fan 2 is provided on the pipeline between the rod mill 1 and the tail gas absorption tower 27; It also includes a slag scraper 3. The slag scraper 3 is connected to the tail gas absorption tower 27 through a pipeline, and a slag scraper exhaust fan 4 is provided on the pipeline between the slag scraper 3 and the tail gas absorption tower 27; It also includes a water coal slurry additive preparation tank 5. The water coal slurry additive preparation tank 5 is connected to the tail gas absorption tower 27 through a pipeline, and an additive preparation tank induced draft fan 6 is provided on the pipeline between the water coal slurry additive preparation tank 5 and the tail gas absorption tower 27; It also includes an additive storage tank 7. The additive storage tank 7 is connected to the tail gas absorption tower 27 through a pipeline, and an additive storage tank induced draft fan 8 is provided on the pipeline between the additive storage tank 7 and the tail gas absorption tower 27; It also includes an ammonia-containing tail gas pipe 25. The ammonia-containing tail gas pipe 25 is connected to the tail gas absorption tower 27 through a pipeline; The tail gas absorption tower 27 is also connected to a low-pressure ash water pump 11 through a pipeline. A tail gas washing tower liquid level regulating valve 12 is provided on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27, and a tail gas washing tower bottom PH meter 13 is provided on the tail gas absorption tower 27; The sulfur recovery unit includes a sulfur recovery device 19. The sulfur recovery device 19 is connected to the tail gas absorption tower 27 through a pipeline. The sulfur recovery device 19 is connected to the top of the tail gas absorption tower 27 through a pipeline, and an induced draft fan 18 is provided on the pipeline between the sulfur recovery device 19 and the tail gas absorption tower 27; The heat exchange unit includes an absorption water heat exchanger 17. The input end of the absorption water heat exchanger 17 is connected to a circulating cooling water pipe 26 through a pipeline. The output end of the absorption water heat exchanger 17 is connected to the tail gas absorption tower 27 through a pipeline. An upper packing layer 9 of the tail gas washing tower is fixedly connected inside the tail gas absorption tower 27. The output end of the absorption water heat exchanger 17 is connected to the upper packing layer 9 of the tail gas washing tower through a pipeline. A lower packing layer 10 of the tail gas washing tower is fixedly connected inside the tail gas absorption tower 27 at the bottom of the upper packing layer 9 of the tail gas washing tower. The lower packing layer 10 of the tail gas washing tower is connected to the pipeline between the absorption water heat exchanger 17 and the tail gas absorption tower 27 through a pipeline. The bottom output end of the tail gas absorption tower 27 is connected to the absorption water heat exchanger 17 through a return water pipeline. An absorption water pump 16 is provided on the return water pipeline. An ammonia concentration meter 21 is provided on the return water pipeline between the absorption water pump 16 and the absorption water heat exchanger 17. The return water pipeline is connected to the treatment unit through a pipeline between the ammonia concentration meter 21 and the absorption water heat exchanger 17;The sodium hydroxide reactant unit includes a sodium hydroxide solution storage tank 15. The sodium hydroxide solution storage tank 15 is connected to the tail gas absorption tower 27 through a pipeline. A sodium hydroxide solution metering pump 14 is provided on the pipeline between the sodium hydroxide solution storage tank 15 and the tail gas absorption tower 27. The connection port of the pipeline between the sodium hydroxide solution storage tank 15 and the tail gas absorption tower 27 on the tail gas absorption tower 27 is located between the connection port of the pipeline between the coal gasification gas transportation unit and the tail gas absorption tower 27 on the tail gas absorption tower 27 and the lower packing 10 of the tail gas water washing tower; the connection port of the pipeline between the rod mill 1 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection port of the pipeline between the slag scraper 3 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection port of the pipeline between the coal water slurry additive preparation tank 5 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection port of the pipeline between the additive storage tank 7 and the tail gas absorption tower 27 on the tail gas absorption tower 27, and the connection port of the pipeline between the ammonia-containing tail gas pipe 25 and the tail gas absorption tower 27 on the tail gas absorption tower 27 are all lower than the lower packing 10 of the tail gas water washing tower; both the upper packing 9 and the lower packing 10 of the tail gas water washing tower are selected from one of structured packing, Pall ring packing and Raschig ring packing.;

[0024] Example 5 The coal gasification unorganized emission gas collection, recovery and utilization system proposed in this embodiment is as Figure 1As shown in the figure, it includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is respectively connected with a coal gasification gas delivery unit and a sodium hydroxide reactant unit through pipelines. The output end of the tail gas absorption tower 27 is connected with a sulfur recovery unit through a pipeline. A heat exchange unit is also connected to the tail gas absorption tower 27, and the heat exchange unit is connected with a treatment unit through a pipeline; The coal gasification gas delivery unit includes a rod mill 1. The rod mill 1 is connected with the tail gas absorption tower 27 through a pipeline. A rod mill exhaust fan 2 is provided on the pipeline between the rod mill 1 and the tail gas absorption tower 27; It also includes a slag scraper 3. The slag scraper 3 is connected with the tail gas absorption tower 27 through a pipeline. A slag scraper exhaust fan 4 is provided on the pipeline between the slag scraper 3 and the tail gas absorption tower 27; It also includes a water coal slurry additive preparation tank 5. The water coal slurry additive preparation tank 5 is connected with the tail gas absorption tower 27 through a pipeline. An additive preparation tank induced draft fan 6 is provided on the pipeline between the water coal slurry additive preparation tank 5 and the tail gas absorption tower 27; It also includes an additive storage tank 7. The additive storage tank 7 is connected with the tail gas absorption tower 27 through a pipeline. An additive storage tank induced draft fan 8 is provided on the pipeline between the additive storage tank 7 and the tail gas absorption tower 27; It also includes an ammonia-containing tail gas pipe 25. The ammonia-containing tail gas pipe 25 is connected with the tail gas absorption tower 27 through a pipeline; The tail gas absorption tower 27 is also connected with a low-pressure ash water pump 11 through a pipeline. A tail gas water washing tower liquid level regulating valve 12 is provided on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27. A tail gas water washing tower bottom pH meter 13 is provided on the tail gas absorption tower 27; The sulfur recovery unit includes a sulfur recovery device 19. The sulfur recovery device 19 is connected with the tail gas absorption tower 27 through a pipeline. The sulfur recovery device 19 is connected to the top of the tail gas absorption tower 27 through a pipeline. An induced draft fan 18 is provided on the pipeline between the sulfur recovery device 19 and the tail gas absorption tower 27; The heat exchange unit includes an absorption water heat exchanger 17. The input end of the absorption water heat exchanger 17 is connected with a circulating cooling water pipe 26 through a pipeline. The output end of the absorption water heat exchanger 17 is connected with the tail gas absorption tower 27 through a pipeline. An upper packing layer 9 of the tail gas water washing tower is fixedly connected inside the tail gas absorption tower 27. The output end of the absorption water heat exchanger 17 is connected with the upper packing layer 9 of the tail gas water washing tower through a pipeline. A lower packing layer 10 of the tail gas water washing tower is fixedly connected inside the tail gas absorption tower 27 at the bottom of the upper packing layer 9 of the tail gas water washing tower. The lower packing layer 10 of the tail gas water washing tower is connected to the pipeline between the absorption water heat exchanger 17 and the tail gas absorption tower 27 through a pipeline. The bottom output end of the tail gas absorption tower 27 is connected with the absorption water heat exchanger 17 through a return water pipeline. An absorption water pump 16 is provided on the return water pipeline. An ammonia concentration meter 21 is provided on the return water pipeline between the absorption water pump 16 and the absorption water heat exchanger 17. The pipeline between the ammonia concentration meter 21 and the absorption water heat exchanger 17 on the return water pipeline is connected with the treatment unit through a pipeline;The sodium hydroxide reactant unit includes a sodium hydroxide solution storage tank 15, which is connected to the tail gas absorption tower 27 through a pipeline. A sodium hydroxide solution metering pump 14 is provided on the pipeline between the sodium hydroxide solution storage tank 15 and the tail gas absorption tower 27. The connection port of the pipeline between the sodium hydroxide solution storage tank 15 and the tail gas absorption tower 27 on the tail gas absorption tower 27 is located between the connection port of the pipeline between the coal gasification gas transportation unit and the tail gas absorption tower 27 on the tail gas absorption tower 27 and the lower packing 10 of the tail gas water washing tower; the connection port of the pipeline between the rod mill 1 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection port of the pipeline between the slag catcher 3 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection port of the pipeline between the coal water slurry additive preparation tank 5 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection port of the pipeline between the additive storage tank 7 and the tail gas absorption tower 27 on the tail gas absorption tower 27, and the connection port of the pipeline between the ammonia-containing tail gas pipe 25 and the tail gas absorption tower 27 on the tail gas absorption tower 27 are all lower than the lower packing 10 of the tail gas water washing tower; both the upper packing 9 and the lower packing 10 of the tail gas water washing tower are selected from one of structured packing, Pall rings, and Raschig rings; the treatment unit includes a sewage treatment device 22, an ammonia water concentration device 23, and an organic farm 24. The sewage treatment device 22, the ammonia water concentration device 23, and the organic farm 24 are arranged in parallel. The sewage treatment device 22, the ammonia water concentration device 23, and the organic farm 24 are jointly connected to the return water pipeline between the ammonia concentration meter 21 and the absorption water heat exchanger 17 through a treatment pipeline. A solution external delivery flow regulating valve 20 is provided on the treatment pipeline. A sewage treatment delivery valve 28 is provided on the pipeline at the inlet of the sewage treatment device 22, an ammonia water concentration delivery valve 29 is provided on the pipeline at the inlet of the ammonia water concentration device 23, and an organic farm delivery valve 30 is provided on the pipeline at the inlet of the organic farm 24.;

[0025] Example 6 The method for collecting, recycling, and utilizing the unorganized emission gas of coal gasification proposed in this embodiment, based on the above-mentioned system for collecting, recycling, and utilizing the unorganized emission gas of coal gasification, includes the following steps: S1. The coal gasification gas in the rod mill, slag catcher, coal water slurry additive preparation tank, and additive storage tank is transported to the bottom of the tail gas absorption tower through a pipeline; S2. After the tail gas absorption tower receives the coal gasification gas, the sodium hydroxide solution in the sodium hydroxide solution storage tank is transported to the tail gas absorption tower through the sodium hydroxide solution metering pump. At the same time, the absorption water heat exchanger sprays the cooling water from the top of the absorption tower through the upper packing and the lower packing of the tail gas water washing tower in layers, and fully mixes and reacts with the water gas; S3. The gas after the mixing reaction rises to the top of the tail gas absorption tower, and is transported to the sulfur recovery device for recovery through a draft fan. The mixed ammonia water liquid is circulated, cooled, and diluted through the absorption water heat exchanger; After the ammonia concentration meter detects that the ammonia water liquid is qualified, open the solution external delivery flow regulating valve, and convey the ammonia water liquid to the sewage treatment device, ammonia water concentration improvement device or organic farm for treatment by starting and stopping the sewage treatment conveying valve, ammonia water concentration improvement conveying valve or organic farm conveying valve.

Claims

1. A system for collecting, recycling and utilization of unorganized emissions from coal gasification, characterized in that, The invention comprises a tail gas absorption tower (27), wherein the input end of the tail gas absorption tower (27) is respectively connected to a coal gasification gas delivery unit and a sodium hydroxide reactant unit via pipelines, and the output end of the tail gas absorption tower (27) is connected to a sulfur recovery unit via pipelines. The tail gas absorption tower (27) is also connected to a heat exchange unit, and the heat exchange unit is connected to a processing unit via pipelines.

2. The gasification unorganized emission gas collection, recovery and utilization system according to claim 1, characterized in that The coal gasification gas delivery unit comprises a rod mill (1), the rod mill (1) being connected to the tail gas absorption tower (27) via a pipeline, and a rod mill exhaust fan (2) being provided on the pipeline between the rod mill (1) and the tail gas absorption tower (27); further comprises a slag scooping machine (3), the slag scooping machine (3) being connected to the tail gas absorption tower (27) via a pipeline, and a slag scooping machine exhaust fan (4) being provided on the pipeline between the slag scooping machine (3) and the tail gas absorption tower (27); further comprises a water-coal slurry additive configuration pool (5), the water-coal slurry additive configuration pool (5) The invention also comprises an additive storage tank (7), which is connected to the tail gas absorption tower (27) via a pipeline, and an additive storage tank induced draft fan (6) is provided on the pipeline between the water-coal slurry additive configuration pool (5) and the tail gas absorption tower (27); the additive storage tank (7) is connected to the tail gas absorption tower (27) via a pipeline, and an additive storage tank induced draft fan (8) is provided on the pipeline between the additive storage tank (7) and the tail gas absorption tower (27); and the invention also comprises an ammonia-containing tail gas pipe (25), which is connected to the tail gas absorption tower (27) via a pipeline.

3. The gasification unorganized emission gas collection, recovery and utilization system according to claim 2, wherein, The tail gas absorption tower (27) is also connected to a low-pressure gray water pump (11) via a pipeline. A tail gas water washing tower liquid level regulating valve (12) is provided on the pipeline between the low-pressure gray water pump (11) and the tail gas absorption tower (27). The tail gas absorption tower (27) is provided with a tail gas water washing tower kettle pH meter (13).

4. The gasification unorganized emission gas collection, recovery and utilization system according to claim 3, characterized in that, The sulfur recovery unit comprises a sulfur recovery device (19), the sulfur recovery device (19) is connected to the tail gas absorption tower (27) via a pipeline, the sulfur recovery device (19) is connected to the top of the tail gas absorption tower (27) via a pipeline, and an induced draft fan (18) is provided on the pipeline between the sulfur recovery device (19) and the tail gas absorption tower (27).

5. The gasification unorganized emission gas collection, recovery and utilization system according to claim 4, characterized in that, The heat exchange unit includes an absorption water heat exchanger (17). The input end of the absorption water heat exchanger (17) is connected by a pipeline to a circulating cooling water pipe (26). The output end of the absorption water heat exchanger (17) is connected to the tail gas absorption tower (27) by a pipeline. An upper packing layer of the tail gas water washing tower (9) is fixedly connected inside the tail gas absorption tower (27). The output end of the absorption water heat exchanger (17) is connected to the upper packing layer of the tail gas water washing tower (9) by a pipeline. A lower packing layer of the tail gas water washing tower (10) is fixedly connected at the bottom of the upper packing layer of the tail gas water washing tower (9) inside the tail gas absorption tower (27). The lower packing layer of the tail gas water washing tower (10) is connected by a pipeline to the pipeline between the absorption water heat exchanger (17) and the tail gas absorption tower (27). The bottom output end of the tail gas absorption tower (27) is connected to the absorption water heat exchanger (17) by a return water pipeline. An absorption water pump (16) is provided on the return water pipeline. An ammonia concentration meter (21) is provided on the return water pipeline between the absorption water pump (16) and the absorption water heat exchanger (17). The return water pipeline between the ammonia concentration meter (21) and the absorption water heat exchanger (17) is connected to the treatment unit by a pipeline.

6. The gasification unorganized emission gas collection, recovery and utilization system according to claim 5, characterized in that The sodium hydroxide reactant unit includes a sodium hydroxide solution storage tank (15). The sodium hydroxide solution storage tank (15) is connected to the tail gas absorption tower (27) by a pipeline. A sodium hydroxide solution metering pump (14) is provided on the pipeline between the sodium hydroxide solution storage tank (15) and the tail gas absorption tower (27). The connection port on the tail gas absorption tower (27) of the pipeline between the sodium hydroxide solution storage tank (15) and the tail gas absorption tower (27) is located between the connection port on the tail gas absorption tower (27) of the pipeline between the coal gasification gas delivery unit and the tail gas absorption tower (27) and the lower packing layer of the tail gas water washing tower (10).

7. The gasification unorganized emission gas collection, recovery and utilization system according to claim 6, characterized in that The connection port on the tail gas absorption tower (27) of the pipeline between the rod mill (1) and the tail gas absorption tower (27), the connection port on the tail gas absorption tower (27) of the pipeline between the slag scraper (3) and the tail gas absorption tower (27), the connection port on the tail gas absorption tower (27) of the pipeline between the coal water slurry additive preparation tank (5) and the tail gas absorption tower (27), the connection port on the tail gas absorption tower (27) of the pipeline between the additive storage tank (7) and the tail gas absorption tower (27), and the connection port on the tail gas absorption tower (27) of the pipeline between the ammonia-containing tail gas pipe (25) and the tail gas absorption tower (27) are all lower than the lower packing layer of the tail gas water washing tower (10).

8. The gasification unorganized emission gas collection, recovery and utilization system according to claim 7, characterized in that, Both the upper packing layer of the tail gas water washing tower (9) and the lower packing layer of the tail gas water washing tower (10) are selected from one of structured packing, Pall rings, and Raschig rings.

9. The gasification unorganized emission gas collection, recovery and utilization system according to claim 8, characterized in that The processing unit includes a sewage treatment device (22), an ammonia concentration enrichment device (23) and an organic farm (24). The sewage treatment device (22), the ammonia concentration enrichment device (23) and the organic farm (24) are arranged in parallel. The sewage treatment device (22), the ammonia concentration enrichment device (23) and the organic farm (24) are jointly connected to the return water pipeline between the ammonia concentration meter (21) and the absorption water heat exchanger (17) through a processing pipeline. A solution external delivery flow regulating valve (20) is provided on the processing pipeline. A sewage treatment delivery valve (28) is provided on the pipeline at the inlet of the sewage treatment device (22). An ammonia concentration enrichment delivery valve (29) is provided on the pipeline at the inlet of the ammonia concentration enrichment device (23). An organic farm delivery valve (30) is provided on the pipeline at the inlet of the organic farm (24).

10. Method for collecting, recycling and utilization of unorganized emission gas from coal gasification, characterized in that, The gasification unorganized emission gas collection, recovery and utilization system according to claim 9 includes the following steps: S1. The gasification gas in the rod mill, slag extractor, water coal slurry additive preparation tank and additive storage tank is transported to the bottom of the tail gas absorption tower through a pipeline; S2. After receiving the gasification gas, the tail gas absorption tower transports the sodium hydroxide solution in the sodium hydroxide solution storage tank to the tail gas absorption tower through the sodium hydroxide solution metering pump. At the same time, the absorption water heat exchanger sprays the cooling water from the top of the absorption tower down through the upper packing and the lower packing of the tail gas water washing tower, and fully mixes and reacts with the water gas; S3. The gas after the mixing reaction rises to the top of the tail gas absorption tower and is transported to the sulfur recovery device for recovery through a induced draft fan. The mixed ammonia water liquid is circulated, cooled and diluted through the absorption water heat exchanger; S4. After the ammonia concentration meter detects that the ammonia water liquid is qualified, the solution external delivery flow regulating valve is opened, and the ammonia water liquid is transported to the sewage treatment device, the ammonia concentration enrichment device or the organic farm for treatment by starting and stopping the sewage treatment delivery valve, the ammonia concentration enrichment delivery valve or the organic farm delivery valve.

Images