Waste gas treatment system of coal gasification device

Abstract

The utility model discloses a waste gas treatment system of a coal gasification device, and relates to the technical field of coal chemical industry, the system comprises a slag lock hopper, a slag pool, a slag pool pump, a slag conveyor, a slag conveyor, a vacuum flash tank, a vacuum flash tank top condenser, a settling tank, a flash vacuum pump, a gas phase compressor, a conversion device, a first waste gas conveying pipeline and a second waste gas conveying pipeline; the input end of the first waste gas conveying pipeline is connected with the slag discharging end of the slag pool, the output end of the first waste gas conveying pipeline is connected to the input end of the vacuum flash tank top condenser, the input end of the second waste gas conveying pipeline is connected with the slag conveyor, and the input end of the second waste gas conveying pipeline is arranged close to the slag discharging end of the slag conveyor. And the output end of the second waste gas conveying pipeline is connected to the input end of the vacuum flash tank top condenser. According to the application, the corrosion of the waste gas to the slag salvaging machine, the slag pool and easily-corroded equipment can be effectively reduced, the pollution to the environment is reduced, meanwhile, the waste gas can be recycled after being treated, and the waste of resources is reduced.

Description

Technical Field

[0001] This application relates to the field of coal chemical technology, and in particular to a waste gas treatment system for a coal gasification plant. Background Technology

[0002] Coal gasification is the key unit in coal chemical plants. After the prepared raw coal is gasified in the gasifier with oxygen from the air separation unit, the process gas is washed and sent to the shift conversion unit. The cooled gasification slag is discharged to the slag pool through a slag lock hopper. After slag-water sedimentation and separation, the solid gasification slag is transported to a slag car by a slag remover. The slag car then transfers the gasification slag to a gasification slag disposal site or downstream utilization unit. However, during the discharge of gasification black water and coarse slag from the slag lock hopper to the slag pool, the gas emitted due to pressure drop and flash evaporation corrodes the slag remover and slag pool accessories, shortening the equipment's service life and even causing equipment damage or personnel injury due to reduced strength caused by corrosion. Simultaneously, the waste gas emitted during slag lock hopper depressurization and slag discharge to the slag pool is discharged unorganized to the periphery of the slag pool. This gas contains ammonia, hydrogen sulfide, and hydrogen. Harmful gases such as carbon monoxide, carbon dioxide, dimethyl sulfide, carbon disulfide, hydroxyl sulfur, and thiophene are emitted from the slag pit. Because the exhaust gas from the slag pit cannot be discharged to a safe point in a timely manner, a large amount of harmful gases escape from the slag outlet of the slag removal machine, which damages the health of the "slag inspector" and may even cause poisoning. Furthermore, the uncollected and untreated exhaust gas from the slag pit contains combustible gases such as carbon monoxide and hydrogen. The unorganized emission of these gases results in resource waste, environmental pollution, and damage to the physical and mental health of the workers. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a waste gas treatment system for a coal gasification device, which collects and treats the unorganized waste gas from the slag pit, effectively reducing the corrosion of the slag remover, slag pit, and easily corroded equipment by the waste gas, reducing environmental pollution. At the same time, the treated waste gas can be recycled and reused, reducing resource waste.

[0004] This application provides a waste gas treatment system for a coal gasification device, including: a gasifier, a slag crusher, a slag lock hopper, a slag pool, a slag pool pump, a slag remover, a slag conveyor, a vacuum flash tank, a vacuum flash tank top condenser, a flash vacuum pump, a low-pressure flash tank, a high-pressure flash tank, a settling tank, a flash vacuum pump, a gas phase compressor, a conversion device, a first waste gas conveying pipeline, and a second waste gas conveying pipeline;

[0005] The slag crusher is connected to the high-pressure flash tank and the vacuum flash tank respectively. The high-pressure flash tank is connected to the low-pressure flash tank and the settling tank respectively. The low-pressure flash tank is connected to the vacuum flash tank and the settling tank respectively. The vacuum flash tank is connected to the vacuum flash tank top condenser and the settling tank respectively. The gas output end of the vacuum flash tank top condenser is connected to the input end of the flash vacuum pump. The liquid output end of the vacuum flash tank top condenser is connected to the input end of the settling tank. The output end of the flash vacuum pump is connected to the input end of the gas phase compressor. The output end of the gas phase compressor is connected to the conversion device.

[0006] The output end of the gasifier is connected to the input end of the slag crusher, the output end of the slag crusher is connected to the input end of the slag lock hopper, the output end of the slag lock hopper is connected to the input end of the slag pool, the two ends of the slag pool pump are respectively connected to the liquid output end of the slag pool and the vacuum flash tank, the slag inlet end of the slag remover is connected to the slag discharge end of the slag pool, and the slag outlet end of the slag remover is connected to the input end of the slag conveyor.

[0007] The input end of the first waste gas conveying pipeline is connected to the slag discharge end of the slag pool, the output end of the first waste gas conveying pipeline is connected to the input end of the top condenser of the vacuum flash tank, the input end of the second waste gas conveying pipeline is connected to the slag removal machine, and the input end of the second waste gas conveying pipeline is located close to the slag discharge end of the slag removal machine, and the output end of the second waste gas conveying pipeline is connected to the input end of the top condenser of the vacuum flash tank.

[0008] The flash vacuum pump is used to control the vacuum flash tank and the first and second waste gas delivery pipelines connected to the vacuum flash tank to be in a negative pressure state, so that the first waste gas from the slag discharge end of the slag pool is drawn into the top condenser of the vacuum flash tank through the first waste gas delivery pipeline, and the second waste gas from the slag discharge end of the slag remover is drawn into the top condenser of the vacuum flash tank through the second waste gas delivery pipeline. The top condenser of the vacuum flash tank is used to condense the first waste gas and the second waste gas respectively to obtain a first liquid and a non-condensable gas, and to transport the first liquid to the settling tank. The flash vacuum pump is also used to pump the non-condensable gas in the top condenser of the vacuum flash tank to the gas phase compressor. The gas phase compressor is used to compress the non-condensable gas. The gas phase compressor is used to transport the compressed gas to the conversion device for gas purification.

[0009] According to some embodiments of this application, the waste gas treatment system of the coal gasification device further includes a lock hopper circulating water pump, the two ends of which are respectively connected to the slag crusher and the slag lock hopper.

[0010] According to some embodiments of this application, the slag removal machine includes an inclined section trough and a horizontal section trough. The input end of the inclined section trough is connected to the slag discharge end of the slag pool, the output end of the inclined section trough is connected to the input end of the horizontal section trough, and the output end of the horizontal section trough is connected to the input end of the slag transport machine.

[0011] According to some embodiments of this application, the waste gas treatment system of the coal gasification device further includes a lock hopper flushing water tank, a first flushing water pipeline and a second flushing water pipeline. The two ends of the first flushing water pipeline are respectively connected to the slag lock hopper and the lock hopper flushing water tank, and the two ends of the second flushing water pipeline are respectively connected to the slag lock hopper and the lock hopper flushing water tank.

[0012] According to some embodiments of this application, the waste gas treatment system of the coal gasification device further includes a first liquid conveying pipeline, the two ends of which are respectively connected to the liquid output end of the vacuum flash tank and the input end of the settling tank.

[0013] According to some embodiments of this application, the waste gas treatment system of the coal gasification device further includes a second liquid conveying pipeline, the liquid output end of the low-pressure flash tank is connected to the input end of the second liquid conveying pipeline, and the output end of the second liquid conveying pipeline is connected to the settling tank through the first liquid conveying pipeline.

[0014] According to some embodiments of this application, the waste gas treatment system of the coal gasification device further includes a third liquid conveying pipeline, the liquid output end of the high-pressure flash tank is connected to the input end of the third liquid conveying pipeline, and the output end of the third liquid conveying pipeline is connected to the settling tank through the first liquid conveying pipeline.

[0015] According to some embodiments of this application, the waste gas treatment system of the coal gasification device further includes a fourth liquid conveying pipeline, the input end of which is connected to the liquid output end of the top condenser of the vacuum flash tank, and the output end of which is connected to the input end of the settling tank.

[0016] The beneficial effects of this application are reflected in the following: a first waste gas delivery pipeline connected to the top condenser of the vacuum flash tank is installed at the slag discharge end of the slag pit to draw waste gas from the slag pit and its surrounding area into the vacuum flash tank top condenser. A second waste gas delivery pipeline connected to the top condenser of the vacuum flash tank is installed at the slag discharge end of the slag remover to draw the remaining waste gas after it has been drawn through the first waste gas delivery pipeline into the vacuum flash tank top condenser for condensation treatment. The condensate is collected in a settling tank and returned to the system for reuse. The gas phase is compressed by a gas phase compressor and then recycled through a conversion device. This application, through this configuration, collects and treats the unorganized waste gas from the slag pit, effectively reducing the corrosion of the slag remover, slag pit, and easily corroded equipment by the waste gas, reducing environmental pollution. Simultaneously, the treated waste gas can be recycled, reducing resource waste.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0019] Figure 1 A schematic diagram of the structure of the waste gas treatment system of the coal gasification device provided in the embodiments of this application.

[0020] Figure label:

[0021] Gasifier 100, slag crusher 110, slag lock hopper 120, slag pool 130, high-pressure flash tank 140, low-pressure flash tank 150, vacuum flash tank 160, vacuum flash tank top condenser 170, slag conveyor 180;

[0022] Inclined riser section 210, horizontal section 220, settling tank 230;

[0023] First waste gas conveying pipeline 310, second waste gas conveying pipeline 320, lock bucket flushing water tank 330, lock bucket circulating water pump 340, flash vacuum pump 350, gas phase compressor 360, slag pool pump 370. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0027] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0028] Coal gasification is the key unit in coal chemical plants. After the prepared raw coal is gasified in the gasifier with oxygen from the air separation unit, the process gas is washed and sent to the shift conversion unit. The cooled gasification slag is discharged to the slag pool through a slag lock hopper. After slag-water sedimentation and separation, the solid gasification slag is transported to a slag car by a slag remover. The slag car then transfers the gasification slag to a gasification slag disposal site or downstream utilization unit. However, during the discharge of gasification black water and coarse slag from the slag lock hopper to the slag pool, the gas emitted due to pressure drop and flash evaporation corrodes the slag remover and slag pool accessories, shortening the equipment's service life and even causing equipment damage or personnel injury due to reduced strength caused by corrosion. Simultaneously, the waste gas emitted during slag lock hopper depressurization and slag discharge to the slag pool is discharged unorganized to the periphery of the slag pool. This gas contains ammonia, hydrogen sulfide, and hydrogen. Harmful gases such as carbon monoxide, carbon dioxide, dimethyl sulfide, carbon disulfide, hydroxyl sulfur, and thiophene are emitted from the slag pit. Because the exhaust gas from the slag pit cannot be discharged to a safe point in a timely manner, a large amount of harmful gases escape from the slag outlet of the slag removal machine, which damages the health of the "slag inspector" and may even cause poisoning. Furthermore, the uncollected and untreated exhaust gas from the slag pit contains combustible gases such as carbon monoxide and hydrogen. The unorganized emission of these gases results in resource waste, environmental pollution, and damage to the physical and mental health of the workers.

[0029] To address the aforementioned problems, this application proposes a waste gas treatment system for a coal gasification device. The embodiments of this application will be further described below with reference to the accompanying drawings.

[0030] Reference Figure 1This application provides a waste gas treatment system for a coal gasification unit, including a gasifier 100, a slag crusher 110, a slag lock hopper 120, a slag pool 130, a slag pool pump 370, a slag remover, a slag conveyor 180, a vacuum flash tank 160, a vacuum flash tank top condenser 170, a flash vacuum pump 350, a low-pressure flash tank 150, a high-pressure flash tank 140, a settling tank 230, a gas phase compressor 360, a conversion device, a first waste gas conveying pipeline 310, and a second waste gas conveying pipeline 320. The slag crusher 110 is connected to the high-pressure flash tank 140 and the vacuum flash tank 160, respectively. The high-pressure flash tank 140 is connected to the low-pressure flash tank 150 and the settling tank 230, respectively. The low-pressure flash tank 150 is connected to the vacuum flash tank 160, respectively. Vacuum flash tank 160 is connected to settling tank 230. Vacuum flash tank 160 is connected to vacuum flash tank top condenser 170 and settling tank 230 respectively. The gas output end of vacuum flash tank top condenser 170 is connected to the input end of flash vacuum pump 350. The liquid output end of vacuum flash tank top condenser 170 is connected to the input end of settling tank 230. The output end of flash vacuum pump 350 is connected to the input end of gas phase compressor 360. The output end of gas phase compressor 360 is connected to conversion device. The output end of gasifier 100 is connected to the input end of slag crusher 110. The output end of slag crusher 110 is connected to the input end of slag lock hopper 120. The output end of slag lock hopper 120 is connected to the input end of slag pool 130. The two ends of slag pool pump 370 are connected to slag pool 130 respectively. The liquid output end of the slag remover is connected to the vacuum flash tank 160. The slag inlet end of the slag remover is connected to the slag outlet end of the slag pool 130, and the slag outlet end of the slag remover is connected to the input end of the slag conveyor 180. The input end of the first waste gas conveying pipeline 310 is connected to the slag outlet end of the slag pool 130, and the output end of the first waste gas conveying pipeline 310 is connected to the input end of the vacuum flash tank top condenser 170. The input end of the second waste gas conveying pipeline 320 is connected to the slag remover, and the input end of the second waste gas conveying pipeline 320 is located close to the slag outlet end of the slag remover. The output end of the second waste gas conveying pipeline 320 is connected to the input end of the vacuum flash tank top condenser 170. The flash vacuum pump 350 is used to control the vacuum flash tank 160 and the first waste gas conveying pipeline 160 connected to the vacuum flash tank 160. The first waste gas conveying pipeline 310 and the second waste gas conveying pipeline 320 are under negative pressure. The first waste gas from the slag discharge end of the slag pool 130 is drawn into the vacuum flash tank top condenser 170 through the first waste gas conveying pipeline 310, and the second waste gas from the slag discharge end of the slag remover is drawn into the vacuum flash tank top condenser 170 through the second waste gas conveying pipeline 320. The vacuum flash tank top condenser 170 is used to condense the first waste gas and the second waste gas respectively to obtain a first liquid and a non-condensable gas. The first liquid is then conveyed to the settling tank 230. The flash vacuum pump 350 is also used to pump the non-condensable gas in the vacuum flash tank top condenser 170 to the gas phase compressor 360. The gas phase compressor 360 is used to compress the non-condensable gas.The gas-phase compressor 360 is used to deliver compressed gas to a conversion unit for gas purification.

[0031] It should be noted that the slag-water mixture transported from the slag lock hopper 120 to the slag pool 130 undergoes settling and stratification in the slag pool 130 to form gasification slag, liquid material, and waste gas. The gasification slag is transported to the slag conveyor 180 by the slag remover and then transported by the slag conveyor 180 to the gasification slag disposal site or downstream utilization unit. The liquid material is pumped by the slag pool pump 370 to the flash vacuum pump 350 for secondary flash evaporation, and the resulting liquid is transported to the settling tank 230 for recycling.

[0032] Specifically, the flash vacuum pump 350 is used to control the vacuum flash tank 160 and the first waste gas delivery pipeline 310 and the second waste gas delivery pipeline 320, which are respectively connected to the vacuum flash tank 160, to be in a negative pressure state. This allows the first waste gas from the slag discharge end of the slag pool 130 to be drawn into the vacuum flash tank top condenser 170 through the first waste gas delivery pipeline 310, and the second waste gas from the slag discharge end of the slag remover to be drawn into the vacuum flash tank top condenser 170 through the second waste gas delivery pipeline 320. The vacuum flash tank top condenser 170... The first waste gas and the second waste gas are condensed to obtain a first liquid and a non-condensable gas. The first liquid is then transported to the settling tank 230 for recycling. The flash vacuum pump 350 is also used to pump the non-condensable gas in the top condenser 170 of the vacuum flash tank to the gas phase compressor 360. The gas phase compressor 360 is used to compress the non-condensable gas. The gas phase compressor 360 is used to transport the compressed gas to the conversion device for gas purification and recycling.

[0033] In this application, a first waste gas conveying pipeline 310 is provided at the slag discharge end of the slag pool 130 and connected to the vacuum flash tank top condenser 170, so as to draw the waste gas from the slag pool 130 and the surrounding area of ​​the slag pool 130 to the vacuum flash tank top condenser 170 through the first waste gas conveying pipeline 310. A second waste gas conveying pipeline 320 is provided at the slag discharge end of the slag remover and connected to the vacuum flash tank top condenser 170, so as to draw the remaining waste gas after it is drawn through the first waste gas conveying pipeline 310 to the vacuum flash tank top condenser 170 for condensation treatment. The condensate is collected in the settling tank 230 and returned to the system for reuse. The gas phase is compressed by the gas phase compressor 360 and then enters the conversion device for recycling. This application uses this setup to collect and treat the unorganized waste gas from the slag pool 130, effectively reducing the corrosion of the slag remover, slag pool 130, and easily corroded equipment by the waste gas, thus reducing environmental pollution. At the same time, the treated waste gas can be recycled and reused, reducing resource waste.

[0034] Reference Figure 1It is understandable that the waste gas treatment system of the coal gasification unit also includes a lock hopper circulating water pump 340, the two ends of which are connected to the slag crusher 110 and the slag lock hopper 120, respectively.

[0035] It should be noted that in the traditional method of conveying slag from the slag crusher 110 to the slag lock hopper 120, the slurry often settles during the conveying process, leading to pipe blockage and equipment damage. However, this application adds a lock hopper circulating water pump 340 between the slag crusher 110 and the slag lock hopper 120, and adopts a circulating pumping method to ensure that the slag in the slag crusher 110 is always in a flowing state, avoiding the above-mentioned problems and improving work efficiency.

[0036] Reference Figure 1 It is understood that the slag remover includes an inclined section trough 210 and a horizontal section trough 220. The input end of the inclined section trough 210 is connected to the slag discharge end of the slag pool 130, the output end of the inclined section trough 210 is connected to the input end of the horizontal section trough 220, and the output end of the horizontal section trough 220 is connected to the input end of the slag conveyor 180.

[0037] It should be noted that the horizontal section trough 220 is welded from steel plates and profiles, and consists of two layers. The upper trough is filled with cooling water, and the bottom is lined with wear-resistant steel plates for cooling and granulating hot slag. The lower layer is lined with wear-resistant cast stone slabs made of diabase. The inclined section trough 210 is used to drain ash scraped by scraper chains, reducing the moisture content of the slag to ensure it does not exceed 25%. Both the upper and lower sections of the inclined section are lined with wear-resistant cast stone slabs with a service life of not less than 30 years.

[0038] Reference Figure 1 It is understandable that the waste gas treatment system of the coal gasification unit also includes a lock hopper flushing water tank 330, a first flushing water pipeline and a second flushing water pipeline. The two ends of the first flushing water pipeline are connected to the slag lock hopper 120 and the lock hopper flushing water tank 330, respectively, and the two ends of the second flushing water pipeline are connected to the slag lock hopper 120 and the lock hopper flushing water tank 330, respectively.

[0039] It should be noted that the slag lock hopper 120 of this application adopts a circulating water flushing method formed by the combination of lock hopper flushing water tank 330, first flushing water pipeline and second flushing water pipeline, which can ensure that the slag material in the slag lock hopper 120 is always in a flowing state, and avoid the slag material from settling during the transportation process, which would cause the slag lock hopper 120 to become blocked.

[0040] Understandably, the waste gas treatment system of the coal gasification unit also includes a first liquid conveying pipeline, the two ends of which are connected to the liquid output end of the vacuum flash tank 160 and the input end of the settling tank 230, respectively.

[0041] Understandably, the waste gas treatment system of the coal gasification unit also includes a second liquid conveying pipeline. The liquid output end of the low-pressure flash tank 150 is connected to the input end of the second liquid conveying pipeline, and the output end of the second liquid conveying pipeline is connected to the settling tank 230 through the first liquid conveying pipeline.

[0042] Understandably, the waste gas treatment system of the coal gasification unit also includes a third liquid conveying pipeline. The liquid output end of the high-pressure flash tank 140 is connected to the input end of the third liquid conveying pipeline, and the output end of the third liquid conveying pipeline is connected to the settling tank 230 through the first liquid conveying pipeline.

[0043] Understandably, the waste gas treatment system of the coal gasification unit also includes a fourth liquid conveying pipeline. The input end of the fourth liquid conveying pipeline is connected to the liquid output end of the vacuum flash tank top condenser 170, and the output end of the fourth liquid conveying pipeline is connected to the input end of the settling tank 230.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

[0046] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A waste gas treatment system for a coal gasification unit, characterized in that, include: Gasifier, slag crusher, slag lock hopper, slag pool, slag pool pump, slag remover, slag conveyor, vacuum flash tank, vacuum flash tank top condenser, flash vacuum pump, low-pressure flash tank, high-pressure flash tank, settling tank, flash vacuum pump, gas phase compressor, conversion device, first waste gas conveying pipeline and second waste gas conveying pipeline; The slag crusher is connected to the high-pressure flash tank and the vacuum flash tank respectively. The high-pressure flash tank is connected to the low-pressure flash tank and the settling tank respectively. The low-pressure flash tank is connected to the vacuum flash tank and the settling tank respectively. The vacuum flash tank is connected to the vacuum flash tank top condenser and the settling tank respectively. The gas output end of the vacuum flash tank top condenser is connected to the input end of the flash vacuum pump. The liquid output end of the vacuum flash tank top condenser is connected to the input end of the settling tank. The output end of the flash vacuum pump is connected to the input end of the gas phase compressor. The output end of the gas phase compressor is connected to the conversion device. The output end of the gasifier is connected to the input end of the slag crusher, the output end of the slag crusher is connected to the input end of the slag lock hopper, the output end of the slag lock hopper is connected to the input end of the slag pool, the two ends of the slag pool pump are respectively connected to the liquid output end of the slag pool and the vacuum flash tank, the slag inlet end of the slag remover is connected to the slag discharge end of the slag pool, and the slag outlet end of the slag remover is connected to the input end of the slag conveyor. The input end of the first waste gas conveying pipeline is connected to the slag discharge end of the slag pool, the output end of the first waste gas conveying pipeline is connected to the input end of the top condenser of the vacuum flash tank, the input end of the second waste gas conveying pipeline is connected to the slag removal machine, and the input end of the second waste gas conveying pipeline is located close to the slag discharge end of the slag removal machine, and the output end of the second waste gas conveying pipeline is connected to the input end of the top condenser of the vacuum flash tank. The flash vacuum pump is used to control the vacuum flash tank and the first and second waste gas delivery pipelines connected to the vacuum flash tank to be in a negative pressure state, so that the first waste gas from the slag discharge end of the slag pool is drawn into the vacuum flash tank top condenser through the first waste gas delivery pipeline, and the second waste gas from the slag discharge end of the slag remover is drawn into the vacuum flash tank top condenser through the second waste gas delivery pipeline. The vacuum flash tank top condenser is used to condense the first waste gas and the second waste gas respectively to obtain a first liquid and a non-condensable gas, and to transport the first liquid to the settling tank. The flash vacuum pump is also used to pump the non-condensable gas in the vacuum flash tank top condenser to the gas phase compressor, and the gas phase compressor is used to compress the non-condensable gas. The gas-phase compressor is used to deliver the compressed gas to the conversion device for gas purification.

2. The waste gas treatment system of the coal gasification device according to claim 1, characterized in that, The waste gas treatment system of the coal gasification unit also includes a lock hopper circulating water pump, the two ends of which are connected to the slag crusher and the slag lock hopper, respectively.

3. The waste gas treatment system of the coal gasification device according to claim 1, characterized in that, The slag removal machine includes an inclined section trough and a horizontal section trough. The input end of the inclined section trough is connected to the slag discharge end of the slag pool, the output end of the inclined section trough is connected to the input end of the horizontal section trough, and the output end of the horizontal section trough is connected to the input end of the slag transport machine.

4. The waste gas treatment system of the coal gasification device according to claim 1, characterized in that, The waste gas treatment system of the coal gasification unit also includes a lock hopper flushing water tank, a first flushing water pipeline and a second flushing water pipeline. The two ends of the first flushing water pipeline are respectively connected to the slag lock hopper and the lock hopper flushing water tank, and the two ends of the second flushing water pipeline are respectively connected to the slag lock hopper and the lock hopper flushing water tank.

5. The waste gas treatment system of the coal gasification device according to claim 1, characterized in that, The waste gas treatment system of the coal gasification unit also includes a first liquid conveying pipeline, the two ends of which are connected to the liquid output end of the vacuum flash tank and the input end of the settling tank, respectively.

6. The waste gas treatment system of the coal gasification device according to claim 5, characterized in that, The waste gas treatment system of the coal gasification unit also includes a second liquid conveying pipeline. The liquid output end of the low-pressure flash tank is connected to the input end of the second liquid conveying pipeline, and the output end of the second liquid conveying pipeline is connected to the settling tank through the first liquid conveying pipeline.

7. The waste gas treatment system of the coal gasification device according to claim 5, characterized in that, The waste gas treatment system of the coal gasification unit also includes a third liquid conveying pipeline. The liquid output end of the high-pressure flash tank is connected to the input end of the third liquid conveying pipeline, and the output end of the third liquid conveying pipeline is connected to the settling tank through the first liquid conveying pipeline.

8. The waste gas treatment system of the coal gasification device according to claim 1, characterized in that, The waste gas treatment system of the coal gasification unit also includes a fourth liquid conveying pipeline. The input end of the fourth liquid conveying pipeline is connected to the liquid output end of the top condenser of the vacuum flash tank, and the output end of the fourth liquid conveying pipeline is connected to the input end of the settling tank.

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