Negative-pressure collecting and recycling system for unorganized discharged gas of coal gasification

Abstract

The utility model discloses a coal gasification unorganized exhaust gas negative pressure collecting and recycling system which comprises a tail gas absorption tower, the input end of the tail gas absorption tower is respectively 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; the heat exchange unit is connected with a treatment unit through a pipeline; the tail gas absorption tower is further connected with a low-pressure ash water pump through a pipeline, a tail gas washing tower liquid level adjusting valve is arranged on the pipeline between the low-pressure ash water pump and the tail gas absorption tower, and a tail gas washing tower kettle PH meter is arranged on the tail gas absorption tower. The negative pressure collecting and recycling system for the coal gasification unorganized exhaust gas solves the problems that in traditional coal gasification unorganized exhaust gas recycling, separate treatment is needed, equipment investment is repeated, the operation cost is high, and the operation environment protection pressure is large.

Description

Technical Field

[0001] This utility model belongs to the technical field of coal gasification fugitive emission gas collection equipment, specifically relating to a negative pressure collection and recovery system for coal gasification fugitive emission gas. Background Technology

[0002] Currently, there are two major pain points in the recovery and utilization of fugitive emissions from coal gasification: First, the wastewater from coal-water slurry preparation is rich in volatile organic compounds (VOCs), mercaptans, ammonia, and other odor-causing substances. Traditional aeration treatment easily leads to the spread of foul odors, affecting the surrounding air quality, causing complaints from residents, and also affecting the physical and mental health of employees. Second, the slag remover emits gas containing CO ≥ 500 ppm, H2S ≥ 200 ppm, and NH3 ≥ 1000 ppm. Direct emission of this gas violates the "Emission Standard of Pollutants for Petrochemical Industry" (GB31571-2015) and poses a threat to environmental safety. Existing technologies that treat these two gases separately have several drawbacks, such as redundant investment in equipment (requiring separate purchases of wastewater aeration equipment and waste gas purification devices, increasing capital costs and floor space); high operating costs (wastewater aeration and waste gas purification systems operate independently, with energy and reagent consumption accumulating and resulting in persistently high costs); significant environmental pressure (wastewater aeration treatment is insufficient to completely eliminate VOCs and thiols, and malfunctions in the waste gas purification system may lead to environmental accidents), and companies must manage two separate environmental regulatory systems for wastewater and waste gas, increasing management complexity and the risk of violations; furthermore, low resource recovery efficiency (traditional separate treatment focuses on achieving pollutant emission standards, with insufficient recovery and utilization of valuable components in the gases, resulting in resource waste). Utility Model Content

[0003] The purpose of this invention is to provide a negative pressure collection and recovery system for fugitive emissions from coal gasification, which solves the problems of separate treatment required in the traditional recovery and utilization of fugitive emissions from coal gasification, resulting in repeated equipment investment, high operating costs, and significant environmental pressure.

[0004] The technical solution adopted in this utility model is a negative pressure collection and recovery system for unorganized emissions from coal gasification, including a tail gas absorption tower. The input end of the tail gas absorption tower is connected to a coal gasification gas conveying unit and a sodium hydroxide reactant unit via pipelines. The output end of the tail gas absorption tower is connected to a sulfur recovery unit via pipelines. A heat exchange unit is also connected to the tail gas absorption tower, and the heat exchange unit is connected to a processing unit via pipelines. The tail gas absorption tower is also connected to a low-pressure ash water pump via pipelines. A tail gas water scrubbing tower level regulating valve is installed on the pipeline between the low-pressure ash water pump and the tail gas absorption tower. A tail gas water scrubbing tower bottom pH meter is installed on the tail gas absorption tower.

[0005] The features of this utility model also include:

[0006] The coal gasification gas transmission unit includes a rod mill, which is connected to the tail gas absorption tower via a pipeline, and an exhaust fan for the rod mill is installed on the pipeline between the rod mill and the tail gas absorption tower; it also includes a slag remover, which is connected to the tail gas absorption tower via a pipeline, and an exhaust fan for the slag remover is installed on the pipeline between the slag remover and the tail gas absorption tower; it also includes a coal-water slurry additive preparation tank, which is connected to the tail gas absorption tower via a pipeline, and an induced draft fan for the additive preparation tank is installed on the pipeline between the coal-water 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 via a pipeline, and an induced draft fan for the additive storage tank is installed on the pipeline between the additive storage tank and the tail gas absorption tower; and it also includes an ammonia-containing tail gas pipe, which is connected to the tail gas absorption tower via a pipeline.

[0007] The sulfur recovery unit includes a sulfur recovery device, which is connected to the tail gas absorption tower via a pipeline. The sulfur recovery device is also connected to the top of the tail gas absorption tower via a pipeline. An induced draft fan is installed on the pipeline between the sulfur recovery device and the tail gas absorption tower.

[0008] 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 via a pipeline. The output end of the absorption water heat exchanger is connected to the tail gas absorption tower via a pipeline. The upper packing of the tail gas scrubbing tower is fixed 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 scrubbing tower via a pipeline. The bottom of the upper packing of the tail gas scrubbing tower is fixed to the lower packing of the tail gas absorption tower. The lower packing of the tail gas scrubbing tower is connected to the pipeline between the absorption water heat exchanger and the tail gas absorption tower via a pipeline. The bottom output end of the tail gas absorption tower is connected to the absorption water heat exchanger via a return water pipeline. An absorption water pump is installed on the return water pipeline. An ammonia concentration meter is installed on the return water pipeline between the absorption water pump and the absorption water heat exchanger. The ammonia concentration meter is connected to the treatment unit via a pipeline between the return water pipeline and the absorption water heat exchanger.

[0009] The sodium hydroxide reactant unit includes a sodium hydroxide solution storage tank, which is connected to the tail gas absorption tower via a pipeline. A sodium hydroxide solution metering pump is installed 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 is located between the connection port of the pipeline between the coal gasification gas conveying unit and the tail gas absorption tower and the lower packing of the tail gas washing tower.

[0010] The connection ports of the pipes between the rod mill and the tail gas absorption tower, the connection ports of the pipes between the slag remover and the tail gas absorption tower, the connection ports of the pipes between the coal-water slurry additive preparation tank and the tail gas absorption tower, the connection ports of the pipes between the additive storage tank and the tail gas absorption tower, and the connection ports of the pipes between the ammonia-containing tail gas pipe and the tail gas absorption tower are all lower than the lower packing of the tail gas washing tower.

[0011] Both the upper and lower packing layers of the tail gas scrubbing tower are made of structured packing, Pall ring packing, or Raschig ring packing.

[0012] The treatment unit includes a wastewater treatment device, an ammonia concentration device, and an organic farm. The wastewater treatment device, the ammonia concentration device, and the organic farm are arranged in parallel. The wastewater treatment device, the ammonia concentration device, and the organic farm are all connected to the return water pipe between the ammonia concentration meter and the absorption water heat exchanger through a treatment pipeline. The treatment pipeline is equipped with a solution outflow regulating valve. The wastewater treatment device inlet pipe is equipped with a wastewater treatment delivery valve. The ammonia concentration device inlet pipe is equipped with an ammonia concentration delivery valve. The organic farm inlet pipe is equipped with an organic farm delivery valve.

[0013] The beneficial effects of this utility model are:

[0014] This utility model provides a negative pressure collection and recovery system for fugitive emissions from coal gasification, achieving simultaneous recovery and utilization of different gases during the coal gasification process. This system offers significant advantages: Firstly, by simultaneously processing two gases, valuable components such as sulfur in CO and H2S can be recovered more efficiently, increasing resource recovery rates by over 50% compared to traditional separate processing methods, thus reducing resource waste. Secondly, the integrated system reduces the need for repeated equipment purchases, lowering initial investment costs. Furthermore, the coordinated operation of the equipment reduces long-term energy consumption and reagent consumption, resulting in a cost reduction of over 30%. In addition, the integrated system features a compact design, optimized equipment layout, and reduced floor space. Energy recovery and process synergy further reduce overall energy consumption. A unified control system simplifies operation, reduces the risk of human error, and improves system stability and reliability. More importantly, through simultaneous purification and recovery, the system effectively reduces emissions of pollutants such as VOCs, mercaptans, CO, H2S, and NH3, ensuring stable compliance with emission standards, reducing environmental violations, minimizing the risk of gas escape during treatment, reducing the impact on the surrounding environment, and improving the safety of the production process. This invention reduces dependence on external resources and lowers carbon emissions by efficiently recovering and reusing valuable components in gases. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the coal gasification fugitive emission gas negative pressure collection and recovery system of this utility model.

[0016] In the diagram, 1. Rod mill, 2. Rod mill exhaust fan, 3. Slag remover, 4. Slag remover 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 scrubbing tower, 10. Lower packing of tail gas scrubbing tower, 11. Low-pressure ash water pump, 12. Tail gas scrubbing tower level regulating valve, 13. Tail gas scrubbing tower bottom pH meter, 14. Sodium hydroxide solution metering pump, 15. 16. Sodium hydroxide solution storage tank; 17. Absorption water pump; 18. Absorption water heat exchanger; 19. Exhaust fan; 20. Sulfur recovery device; 21. Solution delivery flow regulating valve; 22. Ammonia concentration meter; 23. Wastewater treatment device; 24. Ammonia water concentration device; 25. Organic farm; 26. Ammonia-containing tail gas pipe; 27. Circulating cooling water pipe; 28. Tail gas absorption tower; 29. ​​Wastewater treatment conveying valve; 30. Ammonia water concentration conveying valve; 31. Organic farm conveying valve. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] The coal gasification fugitive emission gas negative pressure collection and recovery system provided by this utility model, such as Figure 1As shown, the system includes a tail gas absorption tower 27 for attracting coal gasification gas. The input end of the tail gas absorption tower 27 is connected to a coal gasification gas conveying unit and a sodium hydroxide reactant unit via pipelines. The output end of the tail gas absorption tower 27 is connected to a sulfur recovery unit via 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 processing unit via a pipeline. A low-pressure ash water pump 11 is also connected to the tail gas absorption tower 27 via a pipeline. A tail gas water scrubbing tower level regulating valve 12 is installed on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27. When the pressure in the tail gas absorption tower 27 is insufficient, pressure is replenished into the tail gas absorption tower 27 through the low-pressure ash water pump 11 and the tail gas water scrubbing tower level regulating valve 12. The tail gas absorption tower 27 is equipped with a tail gas water scrubbing tower bottom P. The pH meter 13 facilitates real-time measurement of the pH value of the reaction in the tail gas absorption tower 27; the coal gasification gas conveying unit includes a rod mill 1, which is connected to the tail gas absorption tower 27 via a pipeline, and a rod mill exhaust fan 2 is installed on the pipeline between the rod mill 1 and the tail gas absorption tower 27; it also includes a slag remover 3, which is connected to the tail gas absorption tower 27 via a pipeline, and a slag remover exhaust fan 4 is installed on the pipeline between the slag remover 3 and the tail gas absorption tower 27; it also includes a coal-water slurry additive preparation tank 5, which is connected to the tail gas absorption tower 27 via a pipeline, and an additive preparation tank induced draft fan 6 is installed on the pipeline between the coal-water slurry additive preparation tank 5 and the tail gas absorption tower 27; and it also includes an additive storage tank 7, which is connected to the tail gas absorption tower 27 via a pipeline. The system includes an additive storage tank induced draft fan 8 connected to 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 connected to the tail gas absorption tower 27 via a pipeline; a sulfur recovery unit includes a sulfur recovery device 19 connected to the tail gas absorption tower 27 via a pipeline and connected to the top of the tail gas absorption tower 27 via a pipeline, with an induced draft fan 18 connected to the pipeline between the sulfur recovery device 19 and the tail gas absorption tower 27; a heat exchange unit includes an absorption water heat exchanger 17, with a circulating cooling water pipe 26 connected to the input end of the absorption water heat exchanger 17 via a pipeline for providing cooling water, and the output end of the absorption water heat exchanger 17 connected to the tail gas absorption tower 27 via a pipeline, with tail gas... The upper packing 9 of the water washing tower is connected to the output end of the absorption water heat exchanger 17 through a pipe. The bottom of the upper packing 9 of the tail gas water washing tower is fixed to the lower packing 10 of the tail gas water washing tower inside the tail gas absorption tower 27, so as to increase 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 pipe between the absorption water heat exchanger 17 and the tail gas absorption tower 27 through a pipe. The bottom output end of the tail gas absorption tower 27 is connected to the absorption water heat exchanger 17 through a return water pipe. An absorption water pump 16 is installed on the return water pipe. An ammonia concentration meter 21 is installed on the return water pipe between the absorption water pump 16 and the absorption water heat exchanger 17. The ammonia concentration meter 21 and the absorption water heat exchanger 17 are connected to the treatment unit through a pipe on the return water pipe.The sodium hydroxide reactant unit includes a sodium hydroxide solution storage tank 15, which is connected to the tail gas absorption tower 27 via a pipeline. A sodium hydroxide solution metering pump 14 is installed 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 is located between the connection port of the pipeline between the coal gasification gas conveying unit and the tail gas absorption tower 27 and the lower packing 10 of the tail gas washing tower. Other connections include the connection port of the pipeline between the rod mill 1 and the tail gas absorption tower 27, the connection port of the pipeline between the slag remover 3 and 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, the connection port of the pipeline between the additive storage tank 7 and the tail gas absorption tower 27, and an ammonia-containing tail gas pipe 2. The connection ports of the pipeline between the 5th layer 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 scrubbing tower; the upper packing 9 of the tail gas scrubbing tower and the lower packing 10 of the tail gas scrubbing tower are both selected from one of the following: structured packing, Pall ring packing, and Raschig ring packing; the treatment unit includes a wastewater treatment device 22, an ammonia concentration device 23, and an organic farm 24. The wastewater treatment device 22, the ammonia concentration device 23, and the organic farm 24 are arranged in parallel. The wastewater treatment device 22, the ammonia concentration device 23, and the organic farm 24 are all connected to the return water pipeline between the ammonia concentration meter 21 and the absorption water heat exchanger 17 through a treatment pipeline. The treatment pipeline is equipped with a solution outflow regulating valve 20. The inlet pipeline of the wastewater treatment device 22 is equipped with a wastewater treatment conveying valve 28. The inlet pipeline of the ammonia concentration device 23 is equipped with an ammonia concentration conveying valve 29. The inlet pipeline of the organic farm 24 is equipped with an organic farm conveying valve 30.

[0019] Example 1

[0020] The coal gasification fugitive emission gas negative pressure collection and recovery system proposed in this embodiment, such as... Figure 1 As shown, the system includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is connected to a coal gasification gas conveying unit and a sodium hydroxide reactant unit via pipelines. The output end of the tail gas absorption tower 27 is connected to a sulfur recovery unit via pipelines. 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 via pipelines. The tail gas absorption tower 27 is also connected to a low-pressure ash water pump 11 via pipelines. A tail gas water scrubbing tower level regulating valve 12 is installed on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27. A tail gas water scrubbing tower bottom pH meter 13 is installed on the tail gas absorption tower 27.

[0021] Example 2

[0022] The coal gasification fugitive emission gas negative pressure collection and recovery system proposed in this embodiment, such as... Figure 1As shown, the system includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is connected to a coal gasification gas conveying unit and a sodium hydroxide reactant unit via pipelines. The output end of the tail gas absorption tower 27 is connected to a sulfur recovery unit via 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 processing unit via a pipeline. A low-pressure ash water pump 11 is also connected to the tail gas absorption tower 27 via a pipeline. A tail gas water scrubbing tower level regulating valve 12 is installed on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27. A tail gas water scrubbing tower bottom pH meter 13 is installed on the tail gas absorption tower 27. The coal gasification gas conveying unit includes a rod mill 1, which is connected to the tail gas absorption tower 27 via a pipeline. The pipeline includes a rod mill exhaust fan 2; a slag remover 3 connected to the tail gas absorption tower 27 via a pipeline, with a slag remover exhaust fan 4 on the pipeline between the slag remover 3 and the tail gas absorption tower 27; a coal-water slurry additive preparation tank 5 connected to the tail gas absorption tower 27 via a pipeline, with an additive preparation tank induced draft fan 6 on the pipeline between the coal-water slurry additive preparation tank 5 and the tail gas absorption tower 27; an additive storage tank 7 connected to the tail gas absorption tower 27 via a pipeline, with an additive storage tank induced draft fan 8 on the pipeline between the additive storage tank 7 and the tail gas absorption tower 27; and an ammonia-containing tail gas pipe 25 connected to the tail gas absorption tower 27 via a pipeline.

[0023] Example 3

[0024] The coal gasification fugitive emission gas negative pressure collection and recovery system proposed in this embodiment, such as... Figure 1As shown, the system includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is connected to a coal gasification gas conveying unit and a sodium hydroxide reactant unit via pipelines. The output end of the tail gas absorption tower 27 is connected to a sulfur recovery unit via 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 processing unit via a pipeline. The tail gas absorption tower 27 is also connected to a low-pressure ash water pump 11 via a pipeline. A tail gas water scrubbing tower level regulating valve 12 is installed on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27. A tail gas water scrubbing tower bottom pH meter 13 is installed on the tail gas absorption tower 27. The coal gasification gas conveying unit includes a rod mill 1, which is connected to the tail gas absorption tower 27 via a pipeline. A rod mill exhaust fan 2 is installed on the pipeline between the rod mill 1 and the tail gas absorption tower 27. The system also includes a slag remover 3, which is connected to the tail gas absorption tower 27 via a pipeline. The pipeline between the tail gas absorption tower 27 and the exhaust fan 4 of the slag remover is installed; it also includes a coal-water slurry additive preparation tank 5, which is connected to the tail gas absorption tower 27 via a pipeline, and an additive preparation tank induced draft fan 6 is installed on the pipeline between the coal-water slurry additive preparation tank 5 and the tail gas absorption tower 27; it also includes 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 8 is installed 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, which is connected to the tail gas absorption tower 27 via a pipeline; the sulfur recovery unit includes a sulfur recovery device 19, which is connected to the tail gas absorption tower 27 via a pipeline, and 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 installed on the pipeline between the sulfur recovery device 19 and the tail gas absorption tower 27.

[0025] Example 4

[0026] The coal gasification fugitive emission gas negative pressure collection and recovery system proposed in this embodiment, such as... Figure 1As shown, the system includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is connected to a coal gasification gas conveying unit and a sodium hydroxide reactant unit via pipelines. The output end of the tail gas absorption tower 27 is connected to a sulfur recovery unit via 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 processing unit via a pipeline. The tail gas absorption tower 27 is also connected to a low-pressure ash water pump 11 via a pipeline. A tail gas water scrubbing tower level regulating valve 12 is installed on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27. A tail gas water scrubbing tower bottom pH meter 13 is installed on the tail gas absorption tower 27. The coal gasification gas conveying unit includes a rod mill 1, which is connected to the tail gas absorption tower 27 via a pipeline. The system includes a rod mill exhaust fan 2; a slag remover 3 connected to a tail gas absorption tower 27 via a pipeline, with an exhaust fan 4 installed on the pipeline between the slag remover 3 and the tail gas absorption tower 27; a coal-water slurry additive preparation tank 5 connected to the tail gas absorption tower 27 via a pipeline, with an additive preparation tank induced draft fan 6 installed on the pipeline between the coal-water slurry additive preparation tank 5 and the tail gas absorption tower 27; an additive storage tank 7 connected to the tail gas absorption tower 27 via a pipeline, with an additive storage tank induced draft fan 8 installed on the pipeline between the additive storage tank 7 and the tail gas absorption tower 27; and an ammonia-containing tail gas pipe 25 connected to the tail gas absorption tower 27 via a pipeline; sulfur recovery. The unit includes a sulfur recovery device 19, which 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 installed 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 which is connected to a circulating cooling water pipe 26 via a pipeline, and the output end of which is connected to the tail gas absorption tower 27 via a pipeline. The upper packing 9 of the tail gas water scrubbing tower is fixedly connected inside the tail gas absorption tower 27, and the output end of the absorption water heat exchanger 17 is connected to the upper packing 9 of the tail gas water scrubbing tower via a pipeline. The bottom of the upper packing 9 of the tail gas water scrubbing tower is fixedly connected to the lower packing 9 of the tail gas water scrubbing tower inside the tail gas absorption tower 27. The lower packing 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 via a pipeline. The bottom output end of the tail gas absorption tower 27 is connected to the absorption water heat exchanger 17 via a return water pipeline. An absorption water pump 16 is installed on the return water pipeline. An ammonia concentration meter 21 is installed on the return water pipeline between the absorption water pump 16 and the absorption water heat exchanger 17. The ammonia concentration meter 21 is connected to the treatment unit via a pipeline between the return water pipeline 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 via a pipeline. A sodium hydroxide solution metering pump 14 is installed on the pipeline between the sodium hydroxide solution storage tank 15 and the tail gas absorption tower 27.

[0027] Example 5

[0028] The coal gasification fugitive emission gas negative pressure collection and recovery system proposed in this embodiment, such as... Figure 1As shown, the system includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is connected to a coal gasification gas conveying unit and a sodium hydroxide reactant unit via pipelines. The output end of the tail gas absorption tower 27 is connected to a sulfur recovery unit via 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 processing unit via a pipeline. The tail gas absorption tower 27 is also connected to a low-pressure ash water pump 11 via a pipeline. A tail gas water scrubbing tower level regulating valve 12 is installed on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27. A tail gas water scrubbing tower bottom pH meter 13 is installed on the tail gas absorption tower 27. The coal gasification gas conveying unit includes a rod mill 1, which is connected to the tail gas absorption tower 27 via a pipeline. The system includes a rod mill exhaust fan 2; a slag remover 3 connected to a tail gas absorption tower 27 via a pipeline, with an exhaust fan 4 installed on the pipeline between the slag remover 3 and the tail gas absorption tower 27; a coal-water slurry additive preparation tank 5 connected to the tail gas absorption tower 27 via a pipeline, with an additive preparation tank induced draft fan 6 installed on the pipeline between the coal-water slurry additive preparation tank 5 and the tail gas absorption tower 27; an additive storage tank 7 connected to the tail gas absorption tower 27 via a pipeline, with an additive storage tank induced draft fan 8 installed on the pipeline between the additive storage tank 7 and the tail gas absorption tower 27; and an ammonia-containing tail gas pipe 25 connected to the tail gas absorption tower 27 via a pipeline; sulfur recovery. The unit includes a sulfur recovery device 19, which 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 installed 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 which is connected to a circulating cooling water pipe 26 via a pipeline, and the output end of which is connected to the tail gas absorption tower 27 via a pipeline. The upper packing 9 of the tail gas water scrubbing tower is fixedly connected inside the tail gas absorption tower 27, and the output end of the absorption water heat exchanger 17 is connected to the upper packing 9 of the tail gas water scrubbing tower via a pipeline. The bottom of the upper packing 9 of the tail gas water scrubbing tower is fixedly connected to the lower packing 9 of the tail gas water scrubbing tower inside the tail gas absorption tower 27. The lower packing 10 of the tail gas scrubbing tower is connected to the pipeline between the absorption water heat exchanger 17 and the tail gas absorption tower 27 via a pipeline. The bottom output end of the tail gas absorption tower 27 is connected to the absorption water heat exchanger 17 via a return water pipeline. An absorption water pump 16 is installed on the return water pipeline. An ammonia concentration meter 21 is installed on the return water pipeline between the absorption water pump 16 and the absorption water heat exchanger 17. The ammonia concentration meter 21 is connected to the treatment unit via a pipeline between the return water pipeline 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 via a pipeline. A sodium hydroxide solution metering pump 14 is installed 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 conveying unit and the tail gas absorption tower 27 on the tail gas absorption tower 27 and the lower packing 10 of the tail gas washing tower; the connection ports of the pipeline between the rod mill 1 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection ports of the pipeline between the slag remover 3 and the tail gas absorption tower 27 on the tail gas absorption tower 27, the connection ports 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 ports 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 ports 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 washing tower.

[0029] Example 6

[0030] The coal gasification fugitive emission gas negative pressure collection and recovery system proposed in this embodiment, such as... Figure 1As shown, the system includes a tail gas absorption tower 27. The input end of the tail gas absorption tower 27 is connected to a coal gasification gas conveying unit and a sodium hydroxide reactant unit via pipelines. The output end of the tail gas absorption tower 27 is connected to a sulfur recovery unit via 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 processing unit via a pipeline. The tail gas absorption tower 27 is also connected to a low-pressure ash water pump 11 via a pipeline. A tail gas water scrubbing tower level regulating valve 12 is installed on the pipeline between the low-pressure ash water pump 11 and the tail gas absorption tower 27. A tail gas water scrubbing tower bottom pH meter 13 is installed on the tail gas absorption tower 27. The coal gasification gas conveying unit includes a rod mill 1, which is connected to the tail gas absorption tower 27 via a pipeline. The system includes a rod mill exhaust fan 2; a slag remover 3 connected to a tail gas absorption tower 27 via a pipeline, with an exhaust fan 4 installed on the pipeline between the slag remover 3 and the tail gas absorption tower 27; a coal-water slurry additive preparation tank 5 connected to the tail gas absorption tower 27 via a pipeline, with an additive preparation tank induced draft fan 6 installed on the pipeline between the coal-water slurry additive preparation tank 5 and the tail gas absorption tower 27; an additive storage tank 7 connected to the tail gas absorption tower 27 via a pipeline, with an additive storage tank induced draft fan 8 installed on the pipeline between the additive storage tank 7 and the tail gas absorption tower 27; and an ammonia-containing tail gas pipe 25 connected to the tail gas absorption tower 27 via a pipeline; sulfur recovery. The unit includes a sulfur recovery device 19, which 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 installed 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 which is connected to a circulating cooling water pipe 26 via a pipeline, and the output end of which is connected to the tail gas absorption tower 27 via a pipeline. The upper packing 9 of the tail gas water scrubbing tower is fixedly connected inside the tail gas absorption tower 27, and the output end of the absorption water heat exchanger 17 is connected to the upper packing 9 of the tail gas water scrubbing tower via a pipeline. The bottom of the upper packing 9 of the tail gas water scrubbing tower is fixedly connected to the lower packing 9 of the tail gas water scrubbing tower inside the tail gas absorption tower 27. The lower packing 10 of the tail gas scrubbing tower is connected to the pipeline between the absorption water heat exchanger 17 and the tail gas absorption tower 27 via a pipeline. The bottom output end of the tail gas absorption tower 27 is connected to the absorption water heat exchanger 17 via a return water pipeline. An absorption water pump 16 is installed on the return water pipeline. An ammonia concentration meter 21 is installed on the return water pipeline between the absorption water pump 16 and the absorption water heat exchanger 17. The ammonia concentration meter 21 is connected to the treatment unit via a pipeline between the return water pipeline 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 via a pipeline. A sodium hydroxide solution metering pump 14 is installed 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 conveying unit and the tail gas absorption tower 27 on the tail gas absorption tower 27 and the lower packing 10 of the tail gas 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 remover 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 washing tower; tail The upper packing 9 of the gas-water scrubbing tower and the lower packing 10 of the tail gas scrubbing tower are both selected from one of the following: structured packing, Pall ring packing, and Raschig ring packing. The treatment unit includes a wastewater treatment device 22, an ammonia concentration device 23, and an organic farm 24. The wastewater treatment device 22, the ammonia concentration device 23, and the organic farm 24 are arranged in parallel. The wastewater treatment device 22, the ammonia concentration device 23, and the organic farm 24 are all connected to the return water pipe between the ammonia concentration meter 21 and the absorption water heat exchanger 17 through a treatment pipeline. The treatment pipeline is equipped with a solution outflow regulating valve 20. The wastewater treatment device 22 inlet pipeline is equipped with a wastewater treatment delivery valve 28. The ammonia concentration device 23 inlet pipeline is equipped with an ammonia concentration delivery valve 29. The organic farm 24 inlet pipeline is equipped with an organic farm delivery valve 30.

Claims

1. A negative pressure collection and recovery system for fugitive emissions from coal gasification, characterized in that, The system includes a tail gas absorption tower (27), the input end of which is connected to a coal gasification gas conveying unit and a sodium hydroxide reactant unit via pipelines, the output end of which is connected to a sulfur recovery unit via pipelines, a heat exchange unit connected to the tail gas absorption tower (27), and a processing unit connected to the heat exchange unit via pipelines; the tail gas absorption tower (27) is also connected to a low-pressure ash water pump (11) via pipelines, a tail gas water scrubbing tower 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 water scrubbing tower bottom pH meter (13) is provided on the tail gas absorption tower (27).

2. The coal gasification fugitive emission gas negative pressure collection and recovery system according to claim 1, characterized in that, The coal gasification gas conveying unit includes a rod mill (1), which is connected to the tail gas absorption tower (27) via a pipeline. A rod mill exhaust fan (2) is installed on the pipeline between the rod mill (1) and the tail gas absorption tower (27). It also includes a slag remover (3), which is connected to the tail gas absorption tower (27) via a pipeline. A slag remover exhaust fan (4) is installed on the pipeline between the slag remover (3) and the tail gas absorption tower (27). Furthermore, it includes a coal-water slurry additive preparation tank (5). The coal-water slurry additive preparation tank (5) is connected to the tail gas absorption tower (27) via a pipeline, and an additive preparation tank induced draft fan (6) is provided on the pipeline between the coal-water slurry additive preparation tank (5) and the tail gas absorption tower (27); it also includes 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 (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), which is connected to the tail gas absorption tower (27) via a pipeline.

3. The coal gasification fugitive emission gas negative pressure collection and recovery system according to claim 1, characterized in that, The sulfur recovery unit includes a sulfur recovery device (19), which 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. An induced draft fan (18) is provided on the pipeline between the sulfur recovery device (19) and the tail gas absorption tower (27).

4. The coal gasification fugitive emission gas negative pressure collection and recovery system according to claim 2, 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 to a circulating cooling water pipe (26) via a pipe. The output end of the absorption water heat exchanger (17) is connected to the tail gas absorption tower (27) via a pipe. The tail gas absorption tower (27) is fixedly connected to the upper layer packing (9) of the tail gas scrubbing tower. The output end of the absorption water heat exchanger (17) is connected to the upper layer packing (9) of the tail gas scrubbing tower via a pipe. The bottom of the upper layer packing (9) of the tail gas scrubbing tower is fixedly connected to the lower layer packing (9) of the tail gas scrubbing tower within the tail gas absorption tower (27). 10), the lower packing (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 ammonia concentration meter (21) and the absorption water heat exchanger (17) are connected to the treatment unit through a pipeline on the return water pipeline.

5. The coal gasification fugitive emission gas negative pressure collection and recovery system according to claim 4, characterized in that, The sodium hydroxide reactant unit includes a sodium hydroxide solution storage tank (15), which is connected to the tail gas absorption tower (27) via a pipeline. A sodium hydroxide solution metering pump (14) is installed on the pipeline between the sodium hydroxide solution storage tank (15) and the tail gas absorption tower (27).

6. The coal gasification fugitive emission gas negative pressure collection and recovery system according to claim 5, characterized in that, The connection port of the pipeline between the sodium hydroxide solution storage tank (15) and the tail gas absorption tower (27) is located between the connection port of the pipeline between the coal gasification gas conveying unit and the tail gas absorption tower (27) and the lower packing (10) of the tail gas washing tower.

7. The coal gasification fugitive emission gas negative pressure collection and recovery system according to claim 4, characterized in that, The connection ports of the pipes between the rod mill (1) and the tail gas absorption tower (27), the connection ports of the pipes between the slag remover (3) and the tail gas absorption tower (27), the connection ports of the pipes between the coal-water slurry additive preparation tank (5) and the tail gas absorption tower (27), the connection ports of the pipes between the additive storage tank (7) and the tail gas absorption tower (27), and the connection ports of the pipes between the ammonia-containing tail gas pipe (25) and the tail gas absorption tower (27) are all lower than the lower packing (10) of the tail gas washing tower.

8. The coal gasification fugitive emission gas negative pressure collection and recovery system according to claim 4, characterized in that, The upper packing (9) and lower packing (10) of the tail gas scrubbing tower are both selected from one of the following: structured packing, Pall ring packing and Raschig ring packing.

9. The coal gasification fugitive emission gas negative pressure collection and recovery system according to claim 4, characterized in that, The processing unit includes a wastewater treatment device (22), an ammonia concentration device (23), and an organic farm (24). The wastewater treatment device (22), the ammonia concentration device (23), and the organic farm (24) are arranged in parallel. The wastewater treatment device (22), the ammonia concentration device (23), and the organic farm (24) are connected to the return water pipe between the ammonia concentration meter (21) and the absorption water heat exchanger (17) through a processing pipe. The processing pipe is equipped with a solution outflow regulating valve (20). The wastewater treatment device (22) inlet pipe is equipped with a wastewater treatment delivery valve (28). The ammonia concentration device (23) inlet pipe is equipped with an ammonia concentration delivery valve (29). The organic farm (24) inlet pipe is equipped with an organic farm delivery valve (30).

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