A gasifier based on a fly ash recirculation system and its working method

Abstract

A gasifier based on a fly ash recirculation system and its working method disclosed by the present invention belong to the technical field of gasifiers. The inlet of the gas ash remover is connected to the waste heat boiler outlet of the gasifier, the bottom outlet of the gas ash remover is connected to the fly ash storage tank, the fly ash storage tank and the pulverized coal conveying atmospheric tank are respectively connected to the pulverized coal conveying variable pressure tank, the pulverized coal conveying variable pressure tank is connected with a stamping nitrogen inlet pipe, the pulverized coal conveying variable pressure tank is connected to the pulverized coal conveying high pressure tank, the pulverized coal conveying high pressure tank is connected to the burner of the gasifier, and the pulverized coal conveying high pressure tank is connected with a high pressure nitrogen inlet pipe; the fly ash and pulverized coal blending system is respectively connected to the fly ash storage tank and the pulverized coal conveying atmospheric tank. The present invention can make full use of fly ash residual carbon, accurately control the ratio of fly ash to coal, at the same time, simplify the fly ash conveying process, reduce the loss of the coal mill, make full use of the system pressure energy, and greatly save the fly ash circulation cost and equipment investment.

Description

Technical Field

[0001] The present invention belongs to the technical field of gasifiers, and particularly relates to a gasifier based on a fly ash recirculation system and its working method. Background Art

[0002] Coal gasification technology is the core technology for the clean and efficient utilization of coal, and is the key technology for the development of advanced clean coal power generation, coal chemical industry, coal-based polygeneration and other energy systems, which has an important impact on the operation reliability and economy of each system. Driven by the rapid development of modern coal chemical projects, coal gasification technology is developing towards the direction of large-scale, clean and efficient, and wide coal type adaptability. The development of coal gasification technology presents a diverse situation, but in the process of the development of high-efficiency and clean coal gasification technology at the present stage, there are still many problems to be solved.

[0003] In the existing gasifier system, when fly ash is transported to the coal mill, it will cause additional losses to the coal mill; moreover, since the coal mill is at atmospheric pressure, the fly ash has to go through the processes of pressure increase and then pressure reduction, and the equipment and process are cumbersome and the energy consumption is high. In addition, the ratio of fly ash to coal is not easy to control, and as a result, the ratio of oxygen and water is mostly blindly adjusted according to experience, and the reaction cannot be accurately controlled. Summary of the Invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a gasifier based on a fly ash recirculation system and its working method, which can make full use of fly ash residual carbon, accurately control the ratio of fly ash to coal, and at the same time, simplify the fly ash transportation process, reduce the loss of the coal mill, make full use of the system pressure energy, and greatly save the fly ash circulation cost and equipment investment.

[0005] The present invention is realized by the following technical solutions:

[0006] The present invention discloses a gasifier based on a fly ash recirculation system, including a gas ash remover, a fly ash storage tank, a coal powder transportation atmospheric tank, a coal powder transportation variable pressure tank, a coal powder transportation high-pressure tank and a fly ash and coal powder blending system;

[0007] The inlet of the gas ash remover is connected to the waste heat boiler outlet of the gasifier, the bottom outlet of the gas ash remover is connected to the fly ash storage tank, the fly ash storage tank and the coal powder transportation atmospheric tank are respectively connected to the coal powder transportation variable pressure tank, the coal powder transportation variable pressure tank is connected with a stamping nitrogen inlet pipe, the coal powder transportation variable pressure tank is connected to the coal powder transportation high-pressure tank, the coal powder transportation high-pressure tank is connected to the burner of the gasifier, and the coal powder transportation high-pressure tank is connected with a high-pressure nitrogen inlet pipe; the fly ash and coal powder blending system is respectively connected to the fly ash storage tank and the coal powder transportation atmospheric tank.

[0008] Preferably, a first control valve is provided on the connecting pipeline between the fly ash storage tank and the pulverized coal conveying variable pressure tank, a second control valve is provided on the connecting pipeline between the pulverized coal conveying atmospheric pressure tank and the pulverized coal conveying variable pressure tank, and the fly ash and pulverized coal blending system is respectively connected to the first control valve and the second control valve; a third control valve is provided on the connecting pipeline between the pulverized coal conveying variable pressure tank and the pulverized coal conveying high pressure tank.

[0009] Further preferably, the fly ash storage tank, the pulverized coal conveying atmospheric pressure tank, the pulverized coal conveying variable pressure tank, the pulverized coal conveying high pressure tank, the first control valve, the second control valve and the third control valve are all connected with a bridging removal nitrogen system.

[0010] Further preferably, the inlet pipe of the bridging removal nitrogen system is arranged at the bottom of the fly ash storage tank, the pulverized coal conveying atmospheric pressure tank, the pulverized coal conveying variable pressure tank and the pulverized coal conveying high pressure tank.

[0011] Preferably, the high-pressure nitrogen inlet pipe is connected to the lower part of the pulverized coal conveying high pressure tank, and the pulverized coal outlet of the pulverized coal conveying high pressure tank is arranged at the top of the pulverized coal conveying high pressure tank.

[0012] Preferably, the pulverized coal inlet and the fly ash inlet are respectively arranged at the top of the pulverized coal conveying variable pressure tank. The pulverized coal inlet is connected to the pulverized coal conveying atmospheric pressure tank, and the fly ash inlet is connected to the fly ash storage tank; the volume of the pulverized coal conveying variable pressure tank is not less than the sum of the volumes of the fly ash storage tank and the pulverized coal conveying atmospheric pressure tank.

[0013] Preferably, the fly ash storage tank is connected with a first exhaust filter, and the first exhaust filter is connected with a first backflush nitrogen buffer tank.

[0014] Preferably, a second exhaust filter is further included. The pulverized coal conveying atmospheric pressure tank, the pulverized coal conveying variable pressure tank and the pulverized coal conveying high pressure tank are respectively connected to the inlet of the second exhaust filter. The second exhaust filter is connected with a second backflush nitrogen buffer tank, and the bottom outlet of the second exhaust filter is connected to the pulverized coal conveying high pressure tank.

[0015] Preferably, a fly ash extraction branch is connected between the gas ash remover and the fly ash storage tank. An air-lift displacement device is provided on the branch. The inlet of the air-lift displacement device is connected with a nitrogen system. The solid outlet of the air-lift displacement device is connected with a fly ash bin. The gas outlet of the air-lift displacement device is connected with a tail gas treatment system.

[0016] The working method of the gasifier based on the fly ash recirculation system disclosed by the present invention includes:

[0017] The pulverized coal from the coal grinding device enters the pulverized coal conveying atmospheric pressure tank. When the pulverized coal conveying atmospheric pressure tank reaches the set maximum material level, the feeding is stopped. The pulverized coal enters the pulverized coal conveying variable pressure tank. When the pulverized coal conveying atmospheric pressure tank reaches the set minimum material level, the pulverized coal conveying atmospheric pressure tank stops entering the pulverized coal conveying variable pressure tank, and the pulverized coal conveying atmospheric pressure tank is refilled.

[0018] The ash-containing raw syngas exiting the waste heat boiler enters the coal gas dust remover. After being separated and treated by the coal gas dust remover, the raw syngas is discharged from the top of the coal gas dust remover, and the fly ash enters the fly ash storage tank from the bottom of the coal gas dust remover and then enters the variable pressure tank for pulverized coal conveying; the fly ash and pulverized coal blending system controls the frequency and flow rate of the pulverized coal and fly ash entering the variable pressure tank for pulverized coal conveying. After the pulverized coal and fly ash enter the high-pressure tank for pulverized coal conveying from the variable pressure tank for pulverized coal conveying, they are fluidized by high-pressure nitrogen and enter the gasifier furnace through the gasifier burner.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] A gasifier based on a fly ash recirculation system disclosed by the present invention. The ash-containing syngas is separated and treated by a coal gas dust remover at the waste heat boiler outlet of the gasifier, and then enters the variable pressure tank for pulverized coal conveying through the fly ash storage tank; the pulverized coal from the coal grinding system enters the variable pressure tank for pulverized coal conveying through the atmospheric pressure tank for pulverized coal conveying; the fly ash and pulverized coal blending system controls the frequency and flow rate of the pulverized coal and fly ash entering the variable pressure tank for pulverized coal conveying. Finally, the pulverized coal and fly ash enter the gasifier furnace through the gasifier burner. The gasifier has a reasonable structural design and makes full use of the fly ash residual carbon; the fly ash is directly sent from the fly ash storage tank to the variable pressure tank for pulverized coal conveying. On the one hand, the fly ash conveying process is simplified, and the additional loss caused by the coal mill is reduced; on the other hand, since the low-pressure conveying process and equipment are removed, the control process is simplified, and the risk of easy blockage in low-pressure conveying is reduced. It has high efficiency and high reliability, makes full use of the system pressure energy, optimizes the system equipment energy consumption and equipment investment, and greatly saves the fly ash circulation cost and equipment investment. At the same time, through the fly ash and pulverized coal blending system, the ratio of fly ash, coal, oxygen, etc. entering the gasifier can be controlled, improving the overall efficiency of the gasifier and the comprehensive utilization rate of energy.

[0021] Furthermore, through the first control valve and the second control valve, intermittent operation can be carried out according to the inventory levels of the fly ash storage tank and the atmospheric pressure tank for pulverized coal conveying, improving the system efficiency and having a high degree of automation.

[0022] Even further, the bridging prevention nitrogen system can prevent material bridging, improving the safety and stability of the system.

[0023] Even further, the bridging prevention nitrogen system removes bridges at the parts of the bottom of the fly ash storage tank, the atmospheric pressure tank for pulverized coal conveying, the variable pressure tank for pulverized coal conveying, and the high-pressure tank for pulverized coal conveying that are prone to bridging and blockage, with strong pertinence and high efficiency, and saves nitrogen at the same time.

[0024] Furthermore, the high-pressure nitrogen enters the high-pressure tank for pulverized coal conveying from the bottom, and the fly ash and pulverized coal are conveyed in the way of bottom fluidization, solving the problems of poor stability and easy blockage in the pressure conveying system.

[0025] Furthermore, the variable-pressure tank for pulverized coal transportation is respectively provided with a pulverized coal inlet and a fly ash inlet, and its volume is not less than the sum of the volumes of the fly ash storage tank and the atmospheric-pressure tank for pulverized coal transportation, which facilitates the alternative feeding of the fly ash storage tank and the atmospheric-pressure tank for pulverized coal transportation, with high efficiency.

[0026] Furthermore, setting up an exhaust filter and an anti-blowing nitrogen buffer tank can filter and regularly purge the equipment to prevent material blockage.

[0027] Furthermore, a fly ash extraction branch is connected between the gas ash remover and the fly ash storage tank, and an air-lift replacement device is provided on the branch, which can extract the surplus fly ash and recycle it after air-lift.

[0028] The working method of the gasifier based on the fly ash recirculation system disclosed by the present invention can make full use of fly ash residual carbon, accurately control the ratio of fly ash to coal. At the same time, it simplifies the fly ash transportation process, reduces the loss of the coal mill, makes full use of the system pressure energy, and greatly saves the fly ash circulation cost and equipment investment. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0030] In the figure: 1 - gas ash remover, 2 - fly ash storage tank, 3 - atmospheric-pressure tank for pulverized coal transportation, 4 - variable-pressure tank for pulverized coal transportation, 5 - high-pressure tank for pulverized coal transportation, 6 - fly ash and pulverized coal blending system, 7 - first control valve, 8 - second control valve, 9 - third control valve, 10 - first exhaust filter, 11 - first anti-blowing nitrogen buffer tank, 12 - second exhaust filter, 13 - second anti-blowing nitrogen buffer tank. Detailed Embodiments

[0031] The following further describes the present invention in detail with reference to the drawings. The content is an explanation of the present invention rather than a limitation:

[0032] As Figure 1 , it is a gasifier based on the fly ash recirculation system of the present invention. The inlet of the gas ash remover 1 is connected to the outlet of the waste heat boiler of the gasifier. The bottom outlet of the gas ash remover 1 is connected to the fly ash storage tank 2. The fly ash storage tank 2 is connected with a first exhaust filter 10, and the first exhaust filter 10 is connected with a first anti-blowing nitrogen buffer tank 11. The fly ash storage tank 2 and the atmospheric-pressure tank 3 for pulverized coal transportation are respectively connected to the variable-pressure tank 4 for pulverized coal transportation. The variable-pressure tank 4 for pulverized coal transportation is connected with a charging nitrogen inlet pipe. The variable-pressure tank 4 for pulverized coal transportation is connected to the high-pressure tank 5 for pulverized coal transportation. The high-pressure tank 5 for pulverized coal transportation is connected to the burner of the gasifier. The lower part of the high-pressure tank 5 for pulverized coal transportation is connected with a high-pressure nitrogen inlet pipe. The pulverized coal outlet of the high-pressure tank 5 for pulverized coal transportation is arranged at the top of the high-pressure tank 5 for pulverized coal transportation. The fly ash and pulverized coal blending system 6 is respectively connected to the fly ash storage tank 2 and the atmospheric-pressure tank 3 for pulverized coal transportation.

[0033] The gas ash remover 1 preferably adopts a cyclone separator.

[0034] The top of the variable-pressure tank 4 for pulverized coal transportation is respectively provided with a pulverized coal inlet and a fly ash inlet. The pulverized coal inlet is connected to the atmospheric-pressure tank 3 for pulverized coal transportation, and the fly ash inlet is connected to the fly ash storage tank 2. The volume of the variable-pressure tank 4 for pulverized coal transportation is not less than the sum of the volumes of the fly ash storage tank 2 and the atmospheric-pressure tank 3 for pulverized coal transportation.

[0035] A first control valve 7 is provided on the connecting pipeline between the fly ash storage tank 2 and the variable-pressure tank 4 for pulverized coal transportation. A second control valve 8 is provided on the connecting pipeline between the atmospheric-pressure tank 3 for pulverized coal transportation and the variable-pressure tank 4 for pulverized coal transportation. The fly ash and pulverized coal blending system 6 is respectively connected to the first control valve 7 and the second control valve 8. A third control valve 9 is provided on the connecting pipeline between the variable-pressure tank 4 for pulverized coal transportation and the high-pressure tank 5 for pulverized coal transportation. The fly ash storage tank 2, the atmospheric-pressure tank 3 for pulverized coal transportation, the variable-pressure tank 4 for pulverized coal transportation, the high-pressure tank 5 for pulverized coal transportation, the first control valve 7, the second control valve 8 and the third control valve 9 are all connected with a bridging removal nitrogen system. The inlet pipe of the bridging removal nitrogen system is arranged at the bottom of the fly ash storage tank 2, the atmospheric-pressure tank 3 for pulverized coal transportation, the variable-pressure tank 4 for pulverized coal transportation and the high-pressure tank 5 for pulverized coal transportation.

[0036] The atmospheric-pressure tank 3 for pulverized coal transportation, the variable-pressure tank 4 for pulverized coal transportation and the high-pressure tank 5 for pulverized coal transportation are respectively connected to the inlet of the second exhaust filter 12. The second exhaust filter 12 is connected with a second backflush nitrogen buffer tank 13. The bottom outlet of the second exhaust filter 12 is connected to the high-pressure tank 5 for pulverized coal transportation.

[0037] A fly ash extraction branch is connected between the gas ash remover 1 and the fly ash storage tank 2. An air-lift displacement device is provided on the branch. The inlet of the air-lift displacement device is connected with a nitrogen system. The solid outlet of the air-lift displacement device is connected with a fly ash bin. The gas outlet of the air-lift displacement device is connected with a tail gas treatment system.

[0038] The working method of the gasifier based on the fly ash recirculation system described above includes:

[0039] The pulverized coal from coal grinding enters the atmospheric-pressure tank 3 for pulverized coal transportation. When the atmospheric-pressure tank 3 for pulverized coal transportation reaches the set maximum material level, the second control valve 8 is opened, and the pulverized coal goes to the variable-pressure tank 4 for pulverized coal transportation. When the atmospheric-pressure tank 3 for pulverized coal transportation reaches the set minimum material level, the second control valve 8 is closed, and the atmospheric-pressure tank 3 for pulverized coal transportation is recharged.

[0040] The ash-containing raw syngas coming out of the waste heat boiler enters the gas ash remover 1. The raw syngas goes to the next section from the top of the cyclone, and the fly ash goes to the fly ash storage tank 2 from the bottom of the gas ash remover 1. After the second control valve 8 and the normal-pressure tank 3 for coal powder conveying complete discharging, open the first control valve 7, and the fly ash goes to the variable-pressure tank 4 for coal powder conveying. When the fly ash storage tank 2 reaches the set minimum level, close the first control valve 7. During this period, if the level in the fly ash storage tank 2 does not give a low-level alarm within 1 minute, open the corresponding bridge-breaking pipeline for bridge-breaking. When the level drops to the set steady state, close the bridge-breaking pipeline.

[0041] Pressurize the variable-pressure tank 4 for coal powder conveying to 3.5 Mpa, open the third control valve 9, and the material in the variable-pressure tank 4 for coal powder conveying enters the high-pressure tank 5 for coal powder conveying. When the variable-pressure tank 4 for coal powder conveying reaches the set minimum level, close the third control valve 9, open the valve connecting the variable-pressure tank 4 for coal powder conveying to the second exhaust filter 12 for pressure relief, and close the pressure relief valve after pressure relief. Repeat the above operations. During this period, if the level in the variable-pressure tank 4 for coal powder conveying does not give a low-level alarm within 1 minute, open the corresponding bridge-breaking pipeline for bridge-breaking. When the level drops to the set steady state, close the bridge-breaking pipeline.

[0042] The fly ash and coal powder blending system 6 controls the feeding sequence, with the coal powder at normal pressure in the normal-pressure tank 3 for coal powder conveying feeding first and the fly ash at high pressure in the fly ash storage tank 2 feeding later.

[0043] When the first exhaust filter 10 reaches the maximum level, open the high-pressure nitrogen to blow the fly ash into the fly ash storage tank 2. When the second exhaust filter 12 reaches the maximum level, open the high-pressure nitrogen to blow the coal powder into the high-pressure tank 5 for coal powder conveying. The material in the high-pressure tank 5 for coal powder conveying is fluidized by high-pressure nitrogen and sprayed into the coal powder burner.

[0044] The following uses a specific embodiment to further explain the effect of the present invention:

[0045] For a two-stage dry coal powder pressurized gasifier with a capacity of 2165 t / d, the fly ash output is 8124 kg / h, and the fly ash residual carbon is 40%. It is sent into the variable-pressure tank 4 for coal powder conveying through this system to be mixed with coal powder and then enter the gasifier.

[0046] Four burners are set in the first stage, and each burner feeds 18854 kg / h of coal powder; each burner feeds 15208.3 kg / h of oxygen; each burner feeds 1637.5 kg / h of steam;

[0047] Two burners are set in the second stage, and each coal powder burner feeds 5938 kg / h of coal powder; each coal powder burner feeds 1696.9 kg / h of steam.

[0048] Under the condition of not affecting the reaction and stable operation of the gasifier, fly ash is fed into the variable-pressure tank 4 for pulverized coal conveying in proportion and mixed with pulverized coal to enter the gasifier. The system recycles fly ash repeatedly. The synthesis gas of the gasifier increases by 7217 NM3 / h, and the molten slag increases by 1950 kg / h. The wear of the coal mill is greatly reduced, and the load of the conveying system is greatly reduced.

[0049] As described above, it is only a part of the embodiments of the present invention. Although some terms are used in the present invention, the possibility of using other terms is not excluded. These terms are used only for the convenience of describing and explaining the essence of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention. The above description is only to further illustrate the content of the present invention by way of examples for easier understanding, but it does not mean that the embodiments of the present invention are limited thereto. Any technical extension or re-creation based on the present invention is protected by the present invention.

Claims

1. A gasifier based on a fly ash recirculation system, characterized in that, It includes a gas ash remover (1), a fly ash storage tank (2), a normal-pressure pulverized coal conveying tank (3), a variable-pressure pulverized coal conveying tank (4), a high-pressure pulverized coal conveying tank (5), and a fly ash and pulverized coal blending system (6); The inlet of the gas ash remover (1) is connected to the waste heat boiler outlet of the gasifier. The bottom outlet of the gas ash remover (1) is connected to the fly ash storage tank (2). The fly ash storage tank (2) and the normal-pressure pulverized coal conveying tank (3) are respectively connected to the variable-pressure pulverized coal conveying tank (4). The variable-pressure pulverized coal conveying tank (4) is connected with a nitrogen inlet pipe for boosting pressure. The variable-pressure pulverized coal conveying tank (4) is connected to the high-pressure pulverized coal conveying tank (5). The high-pressure pulverized coal conveying tank (5) is connected to the burner of the gasifier. The high-pressure pulverized coal conveying tank (5) is connected with a high-pressure nitrogen inlet pipe. The fly ash and pulverized coal blending system (6) is respectively connected to the fly ash storage tank (2) and the normal-pressure pulverized coal conveying tank (3); A first control valve (7) is provided on the connecting pipeline between the fly ash storage tank (2) and the variable-pressure pulverized coal conveying tank (4). A second control valve (8) is provided on the connecting pipeline between the normal-pressure pulverized coal conveying tank (3) and the variable-pressure pulverized coal conveying tank (4). The fly ash and pulverized coal blending system (6) is respectively connected to the first control valve (7) and the second control valve (8). A third control valve (9) is provided on the connecting pipeline between the variable-pressure pulverized coal conveying tank (4) and the high-pressure pulverized coal conveying tank (5); The fly ash storage tank (2), the normal-pressure pulverized coal conveying tank (3), the variable-pressure pulverized coal conveying tank (4), the high-pressure pulverized coal conveying tank (5), the first control valve (7), the second control valve (8), and the third control valve (9) are all connected with a bridging removal nitrogen system; The inlet pipe of the bridging removal nitrogen system is arranged at the bottom of the fly ash storage tank (2), the normal-pressure pulverized coal conveying tank (3), the variable-pressure pulverized coal conveying tank (4), and the high-pressure pulverized coal conveying tank (5); The high-pressure nitrogen inlet pipe is connected to the lower part of the high-pressure pulverized coal conveying tank (5). The pulverized coal outlet of the high-pressure pulverized coal conveying tank (5) is arranged at the top of the high-pressure pulverized coal conveying tank (5); The variable-pressure pulverized coal conveying tank (4) is respectively provided with a pulverized coal inlet and a fly ash inlet at the top. The pulverized coal inlet is connected to the normal-pressure pulverized coal conveying tank (3), and the fly ash inlet is connected to the fly ash storage tank (2). The volume of the variable-pressure pulverized coal conveying tank (4) is not less than the sum of the volumes of the fly ash storage tank (2) and the normal-pressure pulverized coal conveying tank (3).

2. The gasifier based on the fly ash recirculation system according to claim 1, wherein The fly ash storage tank (2) is connected with a first exhaust filter (10), and the first exhaust filter (10) is connected with a first back-blowing nitrogen buffer tank (11).

3. The gasifier based on the fly ash recirculation system according to claim 1, characterized in that It further includes a second exhaust filter (12). The normal-pressure pulverized coal conveying tank (3), the variable-pressure pulverized coal conveying tank (4), and the high-pressure pulverized coal conveying tank (5) are respectively connected to the inlet of the second exhaust filter (12). The second exhaust filter (12) is connected with a second back-blowing nitrogen buffer tank (13). The bottom outlet of the second exhaust filter (12) is connected to the high-pressure pulverized coal conveying tank (5).

4. The gasifier based on the fly ash recirculation system according to claim 1, wherein A fly ash extraction branch is connected between the gas ash remover (1) and the fly ash storage tank (2). An air-lift replacement device is provided on the branch. The inlet of the air-lift replacement device is connected with a nitrogen system. The solid outlet of the air-lift replacement device is connected with a fly ash bin. The gas outlet of the air-lift replacement device is connected with a tail gas treatment system.

5. The working method of the gasifier based on the fly ash recirculation system according to any one of claims 1 to 4, characterized in that, It includes: The pulverized coal from the coal grinding device enters the atmospheric pressure pulverized coal conveying tank (3). When the atmospheric pressure pulverized coal conveying tank (3) reaches the set maximum material level, the feeding is stopped. The pulverized coal enters the variable pressure pulverized coal conveying tank (4). When the atmospheric pressure pulverized coal conveying tank (3) reaches the set minimum material level, the atmospheric pressure pulverized coal conveying tank (3) stops feeding into the variable pressure pulverized coal conveying tank (4), and the atmospheric pressure pulverized coal conveying tank (3) is refilled with pulverized coal. The ash-containing raw syngas coming out of the waste heat boiler enters the gas ash remover (1). After being separated and treated by the gas ash remover (1), the raw syngas is discharged from the top of the gas ash remover (1), and the fly ash enters the fly ash storage tank (2) from the bottom of the gas ash remover (1), and then enters the variable pressure pulverized coal conveying tank (4). The fly ash and pulverized coal blending system (6) controls the frequency and flow rate of the pulverized coal and fly ash entering the variable pressure pulverized coal conveying tank (4). After the pulverized coal and fly ash enter the high-pressure pulverized coal conveying tank (5) from the variable pressure pulverized coal conveying tank (4), they are fluidized by high-pressure nitrogen and enter the gasifier furnace through the gasifier burner.

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