A coal gasification system producing superheated steam as a byproduct and a method of using the same

Abstract

The object of the present invention is to provide a coal gasification system with by-product superheated steam and a method of using the same, so as to realize the gasification utilization of coal, so as to have the advantages of simple process, low investment, low operating cost, high energy efficiency and good economic benefits. To achieve the above-mentioned purpose, the solution of the present invention is to provide a coal gasification system with by-product superheated steam, characterized in that it comprises: a gasification furnace part, a radiation waste boiler steam-water part, a cyclone separation part, a steam superheating part and a wet washing part, the gasification furnace part is respectively connected to the cyclone separation part and the radiation waste boiler part, the radiation waste boiler part is connected to the steam superheating part, and the cyclone separation part, the steam superheating part and the wet washing part are connected to each other.

Description

Technical Field

[0001] The present invention relates to the technical field of coal chemical industry, and in particular to a coal gasification system producing by-product superheated steam and a use method thereof. Background Art

[0002] Coal gasification is one of the main ways to utilize coal cleanly and efficiently. It is the foundation and key to the development of the new coal chemical industry and plays a leading role in coal chemical projects.

[0003] Entrained-bed technology represents a new level of coal gasification technology development. It is divided into chilling process, semi-waste boiler process and full-waste boiler process according to the heat recovery method. With the advancement of technology and the needs of the times, the mainstream coal gasification technology has gradually developed from the chilling process to the semi-waste boiler process with by-product saturated steam. However, there are few full-waste boiler processes with by-product superheated steam, and only Shell coal gasification technology, but its process is complicated and requires a large investment.

[0004] CN205740909U discloses a coal gasification system with a heat recovery function, which includes: a gasifier, a convection waste boiler, a steam drum, a scrubber, a coarse slag treatment device and an ash water treatment device, wherein the gasifier includes a gasification chamber and a radiation waste boiler, the gasifier has an inner shell and an outer shell sleeved on the outer side of the inner shell, the gasification chamber is arranged at the upper part of the inner shell, and the gasification chamber is connected to the radiation waste boiler arranged at the lower part of the inner shell; the coarse coal gas outlet of the radiation waste boiler is connected to the coarse coal gas inlet of the convection waste boiler, the coal gas outlet of the convection waste boiler is connected to the scrubber, and the scrubber is connected to the ash water treatment device; but this patent cannot produce superheated steam as a by-product.

[0005] Therefore, it is a technical problem to be solved urgently to provide a coal gasification system and a method of using the system in the field of coal chemical technology that produces superheated steam as a by-product. Summary of the invention

[0006] The purpose of the present invention is to provide a coal gasification system with by-product superheated steam and a method of using the same, so as to realize the gasification utilization of coal, with the advantages of simple process, low investment, low operating cost, high energy efficiency and good economic benefits.

[0007] To achieve the above-mentioned purpose, the solution of the present invention is to provide a coal gasification system with by-product superheated steam, characterized in that it comprises: a gasification furnace section, a radiation waste boiler steam-water section, a cyclone separation section, a steam superheating section and a wet scrubbing section, the gasification furnace section is respectively connected to the cyclone separation section and the radiation waste boiler section, the radiation waste boiler section is connected to the steam superheating section, the cyclone separation section, the steam superheating section and the wet scrubbing section are interconnected, the gasification furnace section produces raw synthesis gas, the radiation waste boiler steam-water section is used for heat exchange of the raw synthesis gas and providing steam for the steam superheating section, the cyclone separation section is used for separating gas and solid of the raw synthesis gas, the steam superheating section is used for cooling the raw synthesis gas, and the wet scrubbing section is used for removing solid particles in the raw synthesis gas.

[0008] Furthermore, the gasifier section is composed of an upper gasifier reaction chamber and a lower radiation waste boiler heat exchange chamber, the radiation waste boiler heat exchange chamber is respectively connected to the radiation waste boiler steam-water section and the cyclone separation section, the pulverized coal and oxygen in the gasifier reaction chamber undergo gasification reaction to produce crude synthesis gas, and the radiation waste boiler heat exchange chamber is used to cool the crude synthesis gas; preferably, the gasifier section includes a cooling device, and the temperature of the gasifier section is controlled by a flow regulating valve.

[0009] Further, the radiation waste boiler steam-water part includes: a waste boiler steam drum, which is connected to the radiation waste boiler heat exchange chamber through an ascending pipe and a descending pipe respectively, and the waste boiler steam drum is connected to the steam superheating part through a steam pipeline. The water in the waste boiler steam drum circulates and exchanges heat between the waste boiler steam drum and the radiation waste boiler heat exchange chamber through the ascending pipe and the descending pipe, and the steam in the waste boiler steam drum enters the steam superheating part through the steam pipeline; preferably, the waste boiler steam drum is provided with a pipeline for water replenishment, and a flow regulating valve is provided on the pipeline to control the liquid level of the waste boiler steam drum; preferably, a vent pipeline is provided on the steam pipeline, and a regulating valve is provided on the vent pipeline.

[0010] Furthermore, the cyclone separation section comprises: a cyclone separator, the cyclone separator is used for gas-solid separation of the raw synthesis gas, the cyclone separator is connected to the wet washing section through a pipeline, and receives cooling water from the wet washing section; preferably, the bottom of the cyclone separator is connected to the flash evaporation system through a pipeline.

[0011] Furthermore, the steam superheating part includes: a steam superheater, the tube side of the steam superheater is connected to the steam from the waste boiler drum, and the shell side of the steam superheater passes the raw synthesis gas from the cyclone separator; the steam superheater is provided with a pipeline with a valve for adjusting the pressure in the steam superheater.

[0012] Furthermore, the steam superheating section is provided with more than one set of temperature reducing and pressure reducing devices, which are respectively connected to the steam superheater and the boundary zone through pipelines. Water from the boundary zone enters the steam superheater after passing through the temperature reducing and pressure reducing devices, thereby controlling the temperature of the steam superheater.

[0013] Furthermore, the steam superheating section is provided with more than one set of steam soot blowing devices, which are respectively connected to the steam superheater and the boundary zone, and the steam soot blowing devices control the steam from the boundary zone to blow away the dust deposited on the steam superheater.

[0014] Furthermore, the wet washing section includes: a syngas pre-wash tank, a venturi scrubber, a washing tower and a quenching water pump which are interconnected, the syngas pre-wash tank is connected to the steam superheater, the cyclone separator is connected to the washing tower and the quenching water pump through pipelines, the raw syngas passes through the syngas pre-wash tank, the venturi scrubber and the washing tower in sequence for washing, the washing tower is respectively connected to the conversion condensate and process water through pipelines, the quenching water pump passes the cooling water in the washing tower into the syngas pre-wash tank, the venturi scrubber and the cyclone separator through pipelines, and the washing tower is also provided with a syngas outlet; preferably, the bottom of the syngas pre-wash tank is connected to the flash evaporation system through a pipeline; preferably, the bottom of the washing tower is connected to the flash evaporation system through a pipeline.

[0015] Furthermore, the gasifier part and the steam superheater are respectively provided with one or more sets of mechanical rappers, and the mechanical rappers are used for removing ash from the gasifier part and the steam superheater.

[0016] A method for using a coal gasification system that produces superheated steam as a by-product, in a reaction chamber of a gasifier, pulverized coal and oxygen undergo a gasification reaction to produce a crude synthesis gas, the crude synthesis gas enters a radiation waste boiler heat exchange chamber, and after cooling, enters a cyclone separator for gas-solid separation; water in the waste boiler drum circulates for heat exchange between the waste boiler drum and the radiation waste boiler heat exchange chamber through the ascending pipe and the descending pipe, and the steam in the waste boiler drum enters the steam superheating part through a steam pipeline; the cyclone separator separates most of the dust entrained in the crude synthesis gas; after dust removal, most of the crude synthesis gas enters a steam superheater, and a small part enters a washing tower through a pipeline; the tube side of the steam superheater is connected to the steam from the waste boiler drum, and the shell side of the steam superheater passes the crude synthesis gas from the cyclone separator, and the crude The synthesis gas is cooled after heat exchange in the steam superheater and then enters the synthesis gas pre-wash tank; the crude synthesis gas is saturated with cooling water in the synthesis gas pre-wash tank, and steam-water separation is carried out after passing through a water bath, and the separated crude synthesis gas enters the venturi scrubber through a pipeline; the crude synthesis gas and cooling water are mixed in the venturi scrubber, and the solids in the crude synthesis gas are completely soaked and then enter the washing tower; the crude synthesis gas enters the bottom of the washing tower to impact the liquid surface to remove the solids in the crude synthesis gas, and the crude synthesis gas is contacted with the conversion condensate and process water through cross-current to wash away the remaining solid particles, and then the crude synthesis gas is separated from the liquid by the demister before leaving the washing tower; the cooling water drawn from the bottom of the washing tower is pressurized by a quenching water pump, and one part enters the venturi scrubber through a pipeline, one part enters the synthesis gas pre-wash tank through a pipeline, and the other part enters the cyclone separator through a pipeline.

[0017] Advantages of the present invention:

[0018] 1. The heat recovery method of the coal gasification system provided by the present invention is a semi-waste boiler process, and saturated steam is produced as a by-product.

[0019] 2. The coal gasification system provided by the present invention has the advantages of simple process, low investment, low operating cost, high energy efficiency and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a coal gasification system with by-product superheated steam provided by the present invention;

[0021] As shown in the figure, 1-gasifier part, 2-cyclone separator, 3-steam superheater, 4-synthesis gas pre-wash tank, 5-Venturi scrubber, 6-washing tower, 7-quenching water pump, 8-waste boiler drum, 9-temperature and pressure reducer, 10-mechanical vibrator, 11-cooling device, 12-rising pipeline, 13-down pipeline, 14-steam pipeline, 15-vent pipeline, 16-high-pressure superheated steam pipeline network, 17-steam soot blowing device, 18-synthesis gas outlet, 19-process water, 20-conversion condensate. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] A coal gasification system with by-product superheated steam, characterized in that it comprises: a gasifier section 1, a radiation waste boiler steam-water section, a cyclone separation section, a steam superheat section and a wet scrubbing section, the gasifier section is connected to the cyclone separation section and the radiation waste boiler section respectively, the radiation waste boiler section is connected to the steam superheat section, the cyclone separation section, the steam superheat section and the wet scrubbing section are connected to each other, the gasifier section 1 produces a crude synthesis gas, the radiation waste boiler steam-water section is used for heat exchange of the crude synthesis gas and providing steam for the steam superheat section, the cyclone separation section is used for separating gas and solid of the crude synthesis gas, the steam superheat section is used for cooling the crude synthesis gas, and the wet scrubbing section is used for removing solid particles in the crude synthesis gas.

[0024] The gasifier part 1 is composed of an upper gasifier reaction chamber and a lower radiation waste boiler heat exchange chamber. The radiation waste boiler heat exchange chamber is respectively connected to the radiation waste boiler steam-water part and the cyclone separation part. In the gasifier reaction chamber, pulverized coal and oxygen undergo gasification reaction to produce a crude synthesis gas. The main components of the crude synthesis gas are hydrogen and carbon monoxide, and a small amount of other components include sulfide, nitrogen, argon and methane and liquid slag. The radiation waste boiler heat exchange chamber is used to cool the crude synthesis gas. The gasifier part 1 includes a cooling device 11, which controls the temperature of the gasifier part 1 by adjusting the flow rate of cooling water through a flow regulating valve.

[0025] The steam-water section of the radiation waste boiler is a circulating heat exchange system, which recovers the heat energy in the raw synthesis gas and generates hot steam at the same time; the steam-water section of the radiation waste boiler includes: a waste boiler drum 8, which is connected to the radiation waste boiler heat exchange chamber through an ascending pipe 12 and a descending pipe 13 respectively, and the waste boiler drum 8 is connected to the steam superheating section through a steam pipeline 14. The water of the waste boiler drum 8 circulates and exchanges heat between the waste boiler drum 8 and the radiation waste boiler heat exchange chamber through the ascending pipe 12 and the descending pipe 13, and the steam in the waste boiler drum 8 enters the steam superheating section through the steam pipeline 14; the waste boiler drum 8 is provided with a pipeline for water replenishment, and a flow regulating valve is provided on the pipeline to control the liquid level of the waste boiler drum 8; the steam pipeline 14 is provided with a venting pipeline 15, and the venting pipeline 15 is provided with a regulating valve. When the temperature of the steam is too low, the regulating valve is opened to release part of the steam.

[0026] The cyclone separation section includes: a cyclone separator 2, which is used for gas-solid separation of crude synthesis gas. The cyclone separator 2 is connected to the wet washing section through a pipeline to receive cooling water from the wet washing section; the bottom of the cyclone separator 2 is connected to the flash evaporation system through a pipeline with a valve, and the black water at the bottom of the cyclone separator 2 enters the flash evaporation system for solid-liquid separation and energy recovery, and the liquid level in the cyclone separator 2 is controlled by a valve.

[0027] The steam superheating part includes: a steam superheater 3, the tube side of the steam superheater 3 is connected to the steam from the waste boiler drum 8, and the shell side of the steam superheater 3 passes the raw synthesis gas from the cyclone separator 2; the steam superheater 3 is provided with a pipeline with a valve connected to the high-pressure superheated steam pipeline network 16, and the pressure in the steam superheater 3 is adjusted by the valve.

[0028] The steam superheating section is provided with a group of temperature reducing and pressure reducing devices 9, and the temperature reducing and pressure reducing devices 9 are respectively connected to the steam superheater 3 and the boundary zone through pipelines. The water from the boundary zone enters the steam superheater 3 after passing through the temperature reducing and pressure reducing devices 9, thereby controlling the temperature of the steam superheater 3, thereby ensuring that the steam does not overheat after flowing and exchanging heat in the pipe pass of the steam superheater 3.

[0029] The steam superheating section is provided with a group of steam soot blowing devices 17, which are respectively connected to the steam superheater 3 and the boundary zone. The steam soot blowing devices 17 control the steam from the boundary zone to blow away the dust deposited on the heat exchange tubes on the steam superheater 3.

[0030] The wet scrubbing section comprises: a syngas pre-washing tank 4, a venturi scrubber 5, a scrubbing tower 6 and a quenching water pump 7 which are connected to each other. The syngas pre-washing tank 4 is connected to the steam superheater 3. The cyclone separator 2 is connected to the scrubbing tower 6 and the quenching water pump 7 through pipelines. The raw syngas is sequentially scrubbed by the syngas pre-washing tank 4, the venturi scrubber 5 and the scrubbing tower 6.

[0031] The washing tower 6 is connected to the flash evaporation system through pipelines from the conversion condensate 20 of the conversion unit and the process water 19 from the feed pump of the washing tower 6. The bottom of the washing tower 6 is connected to the flash evaporation system through pipelines. The process water 19 is used to supplement the water carried away by the synthesis gas and the discharged water. The flow rate of the process water 19 is controlled by a flow regulating valve to control the liquid level of the synthesis gas washing tower 6 and reduce the solid content of the black water in the tower; the quenching water pump 7 passes the cooling water in the washing tower 6 into the synthesis gas pre-wash tank 4, the venturi scrubber 5 and the cyclone separator 2 through pipelines, and a flow regulating valve is set on each pipeline; the washing tower 6 is connected to the cyclone separator 2 through a pipeline with a valve, and a part of the raw synthesis gas enters the washing tower 6 through the pipeline; the washing tower 6 is also provided with a synthesis gas outlet 18;

[0032] The washing tower 6 is provided with a downcomer directly connected to the liquid surface at the bottom of the tower, and a spray tray is provided in the annular space around the downcomer. A defoamer is also provided at the synthesis gas outlet 18, and the synthesis gas outlet 18 is connected to the conversion unit;

[0033] The bottom of the synthesis gas pre-wash tank 4 is connected to the flash evaporation system through a pipeline with a flow regulating valve, and the black water in the synthesis gas pre-wash tank 4 enters the flash evaporation system for solid-liquid separation and energy recovery, and the liquid level in the synthesis gas pre-wash tank 4 is controlled by the flow regulating valve; the bottom of the washing tower 6 is connected to the flash evaporation system through a pipeline with a flow regulating valve, and the black water in the washing tower 6 enters the flash evaporation system for solid-liquid separation and energy recovery.

[0034] The gasifier part 1 and the steam superheater 3 are respectively provided with a mechanical rapper 10 , and the mechanical rapper 10 is used to remove ash from the gasifier part 1 and the steam superheater 3 .

[0035] Specific implementation method: A method for using a coal gasification system that produces superheated steam as a byproduct, in the reaction chamber of the gasifier, pulverized coal and oxygen undergo a gasification reaction to produce a crude synthesis gas, the crude synthesis gas enters the radiation waste boiler heat exchange chamber, is cooled to 1200°C by boiler water in the cooling device 11, and then passes through the radiation waste boiler heat exchange chamber to recover heat and reduce the temperature to 700°C, and after cooling, enters the cyclone separator 2 for gas-solid separation;

[0036] The water in the waste boiler drum 8 circulates and exchanges heat between the waste boiler drum 8 and the radiation waste boiler heat exchange chamber through the ascending pipe 12 and the descending pipe 13. The water in the waste boiler drum 8 enters the radiation waste boiler heat exchange chamber through the descending pipe 13, absorbs heat in the raw synthesis gas, and partially vaporizes to form a steam-water mixture. Driven by the density difference, the water returns to the waste boiler drum 8 through the ascending pipe 12, and the steam in the waste boiler drum 8 enters the steam superheating part through the steam pipe 14;

[0037] The cyclone separator 2 separates most of the dust entrained in the raw synthesis gas; after dust removal, most of the raw synthesis gas enters the steam superheater 3, and a small part enters the washing tower 6 through the pipeline for further washing;

[0038] The tube side of the steam superheater 3 is connected to the steam from the waste boiler drum 8, and the shell side of the steam superheater 3 passes the raw synthesis gas from the cyclone separator 2. The raw synthesis gas enters the synthesis gas pre-wash tank 4 after cooling after heat exchange in the steam superheater 3;

[0039] The crude synthesis gas is saturated with cooling water in the synthesis gas pre-wash tank 4, and the dust particles in the crude synthesis gas are wetted by water and condensed into large particles. The solid particles and cooling water enter the flash system through the bottom pipeline of the synthesis gas pre-wash tank 4. After the crude synthesis gas is saturated with cooling water, it passes through a water bath to separate steam and water. The separated crude synthesis gas enters the venturi scrubber 5 through a pipeline; the crude synthesis gas and cooling water are mixed in the venturi scrubber 5, and the solids in the crude synthesis gas are completely soaked and then enter the scrubber 6; the crude synthesis gas enters the bottom of the scrubber 6 through a downcomer to impact the liquid surface , solids in the crude synthesis gas are removed, and the crude synthesis gas passes through the spray tower plate and contacts with the conversion condensate 20 and the process water 19 through cross-current to wash away the remaining solid particles, and then passes through the demister for vapor-liquid separation, and basically does not contain solid particles. The crude synthesis gas leaves the washing tower 6 through the synthesis gas outlet 18 and enters the conversion unit; the cooling water drawn from the bottom of the washing tower 6 is pressurized by the quenching water pump 7, and a part of it enters the Venturi scrubber 5 through the pipeline, a part of it enters the synthesis gas pre-wash tank 4 through the pipeline, and the other part enters the cyclone separator 2 through the pipeline.

[0040] Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A coal gasification system with by-product superheated steam, characterized in that: include: The gasifier section (1) is composed of a gasifier section, a radiation waste boiler steam-water section, a cyclone separation section, a steam superheating section and a wet scrubbing section. The gasifier section is connected to the cyclone separation section and the radiation waste boiler section respectively. The radiation waste boiler section is connected to the steam superheating section. The cyclone separation section, the steam superheating section and the wet scrubbing section are connected to each other. The gasifier section (1) generates a crude synthesis gas. The radiation waste boiler steam-water section is used to exchange heat for the crude synthesis gas and provide steam for the steam superheating section. The cyclone separation section is used to separate gas and solid of the crude synthesis gas. The steam superheating section is used to cool the crude synthesis gas. The wet scrubbing section is used to remove solid particles in the crude synthesis gas. The gasifier section (1) is composed of an upper gasifier reaction chamber and a lower radiation waste boiler heat exchange chamber, wherein the radiation waste boiler heat exchange chamber is connected to the radiation waste boiler steam-water section and the cyclone separation section, respectively. The pulverized coal and oxygen in the gasifier reaction chamber undergo gasification reaction to generate a crude synthesis gas, and the radiation waste boiler heat exchange chamber is used to cool the crude synthesis gas. The radiant waste boiler steam-water section comprises: a waste boiler drum (8), the waste boiler drum (8) being connected to the radiant waste boiler heat exchange chamber via an ascending pipe (12) and a descending pipe (13), the waste boiler drum (8) being connected to the steam superheating section via a steam pipe (14), the water in the waste boiler drum (8) circulates and exchanges heat between the waste boiler drum (8) and the radiant waste boiler heat exchange chamber via the ascending pipe (12) and the descending pipe (13), and the steam in the waste boiler drum (8) enters the steam superheating section via the steam pipe (14); The cyclone separation section comprises: a cyclone separator (2), the cyclone separator (2) is used for gas-solid separation of the crude synthesis gas, the cyclone separator (2) is connected to the wet scrubbing section through a pipeline, and receives cooling water from the wet scrubbing section; The steam superheating section comprises: a steam superheater (3), the tube side of the steam superheater (3) is connected to the steam from the waste boiler drum (8), and the shell side of the steam superheater (3) passes the raw synthesis gas from the cyclone separator (2); the steam superheater (3) is provided with a pipeline with a valve for adjusting the pressure in the steam superheater (3); The gasification furnace section includes a cooling device, and the temperature of the gasification furnace section is controlled by a flow regulating valve.

2. A coal gasification system with by-product superheated steam according to claim 1, characterized in that: The steam superheating section is provided with one or more temperature reducing and pressure reducing devices (9), and the temperature reducing and pressure reducing devices (9) are respectively connected to the steam superheater (3) and the boundary zone through pipelines. Water from the boundary zone enters the steam superheater (3) after passing through the temperature reducing and pressure reducing devices (9), thereby controlling the temperature of the steam superheater (3).

3. The coal gasification system with by-product superheated steam according to claim 1, characterized in that: The steam superheating section is provided with one or more steam soot blowing devices (17), which are respectively connected to the steam superheater (3) and the boundary zone, and the steam soot blowing devices (17) control the steam from the boundary zone to blow away the dust deposited on the steam superheater (3).

4. The coal gasification system with by-product superheated steam according to claim 1, characterized in that: The wet scrubbing section comprises: a synthesis gas pre-washing tank (4), a venturi scrubber (5), a scrubbing tower (6) and a quenching water pump (7) which are interconnected. The synthesis gas pre-washing tank (4) is connected to the steam superheater (3). The cyclone separator (2) is connected to the scrubbing tower (6) and the quenching water pump (7) through pipelines. The raw synthesis gas is washed by passing through the synthesis gas pre-washing tank (4), the venturi scrubber (5) and the scrubbing tower (6) in sequence. The scrubbing tower (6) is connected to the conversion condensate (20) and the process water (19) through pipelines. The quenching water pump (7) passes the cooling water in the scrubbing tower (6) into the synthesis gas pre-washing tank (4), the venturi scrubber (5) and the cyclone separator (2) through pipelines. The scrubbing tower (6) is also provided with a synthesis gas outlet (18).

5. A coal gasification system with by-product superheated steam according to any one of claims 1 to 4, characterized in that: The gasifier part (1) and the steam superheater (3) are respectively provided with one or more sets of mechanical rappers (10), and the mechanical rappers (10) are used to remove ash from the gasifier part (1) and the steam superheater (3).

6. A method for using a coal gasification system producing by-product superheated steam according to any one of claims 1 to 5, characterized in that: In the reaction chamber of the gasifier, pulverized coal and oxygen undergo a gasification reaction to produce a crude synthesis gas, which enters a radiation waste boiler heat exchange chamber and enters a cyclone separator (2) for gas-solid separation after being cooled; water in the waste boiler drum (8) circulates through the ascending pipe (12) and the descending pipe (13) between the waste boiler drum (8) and the radiation waste boiler heat exchange chamber for heat exchange, and the steam in the waste boiler drum (8) enters the steam superheating section through a steam pipe (14); the cyclone separator (2) separates most of the dust entrained in the crude synthesis gas; after dust removal, most of the crude synthesis gas enters a steam superheater (3), and a small part enters a washing tower (6) through a pipe; the tube side of the steam superheater (3) is connected to the steam from the waste boiler drum (8), and the shell side of the steam superheater (3) passes the crude synthesis gas from the cyclone separator (2), and the crude synthesis gas in the steam superheater (3) ) after heat exchange and cooling, the crude synthesis gas enters the synthesis gas pre-wash tank (4); the crude synthesis gas is saturated with cooling water in the synthesis gas pre-wash tank (4), passes through a water bath for steam-water separation, and the separated crude synthesis gas enters the venturi scrubber (5) through a pipeline; the crude synthesis gas and cooling water are mixed in the venturi scrubber (5), and the solids in the crude synthesis gas are completely soaked before entering the scrubbing tower (6); the crude synthesis gas enters the bottom of the scrubbing tower (6) and impacts the liquid surface to remove the solids in the crude synthesis gas, and the crude synthesis gas is contacted with the conversion condensate (20) and the process water (19) through cross-current to wash away the remaining solid particles, and then passes through a demister for steam-liquid separation before leaving the scrubbing tower (6); the cooling water drawn from the bottom of the scrubbing tower (6) is pressurized by a quenching water pump (7), a part of which enters the venturi scrubber (5) through a pipeline, a part of which enters the synthesis gas pre-wash tank (4) through a pipeline, and the other part of which enters the cyclone separator (2) through a pipeline.

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