Water-cooled wall assembly with soot blowing device, radiation waste boiler, gasifier and soot blowing method

Abstract

The present invention discloses a water-cooled wall assembly with a sootblowing device, a radiation waste boiler, a gasifier and a sootblowing method. The water-cooled wall assembly with a sootblowing device comprises a cylindrical water-cooled wall, the cylindrical water-cooled wall is surrounded to form a crude synthesis gas channel; a finned water-cooled wall group, the finned water-cooled wall group comprises a plurality of finned water-cooled walls; a cylindrical water-cooled wall sootblowing pipe is arranged on the cylindrical water-cooled wall between two adjacent finned water-cooled walls, and the cylindrical water-cooled wall sootblowing pipe is circumferentially provided with cylindrical water-cooled wall sootblowing holes; the finned water-cooled wall sootblowing pipe is arranged at one end of the finned water-cooled wall away from the central axis, and the finned water-cooled wall sootblowing pipe is circumferentially provided with at least one finned water-cooled wall sootblowing hole, and the angle θ between the opening direction of the finned water-cooled wall sootblowing hole and the extension direction of the finned water-cooled wall is 5 to 30 degrees. The water-cooled wall assembly with a sootblowing device of the present invention reduces the ash and slag deposition on the surface of the water-cooled wall; the sootblowing method reduces the disturbance of the purge gas to the synthesis gas and improves the stability of the device operation.

Description

Technical Field

[0001] The invention specifically relates to a water-cooled wall assembly with a sootblowing device, a radiation waste boiler, a gasifier and a sootblowing method. Background Art

[0002] Coal is an important energy source and basic raw material in my country. With the rapid development of my country's modern coal chemical industry, entrained-flow coal gasification technology has made great progress and development. According to the process flow, there are three main types of entrained-flow coal gasification: quenching process, waste boiler process, and waste boiler-quenching combined process (also known as semi-waste boiler process). Among them, the gasification technologies of the waste boiler process and the waste boiler-quenching combined process both require the installation of a radiation waste boiler. The main purpose of the radiation waste boiler is to recover the sensible heat of high-temperature synthesis gas and further improve the utilization efficiency of coal, which is of great significance to promoting energy conservation and emission reduction and promoting the realization of dual carbon goals.

[0003] Since coal gasification produces high-temperature raw synthesis gas, it also carries a large amount of solid particles such as ash. These solid particles are hot and sticky. When they pass through the radiation waste boiler along with the synthesis gas, they are easy to deposit and adhere on the surface of the water-cooled wall with a lower temperature, forming ash accumulation, which affects the heat exchange effect. The intuitive manifestation of judging whether the radiation waste boiler is ash-accumulated is to monitor the amount of high-temperature saturated steam in the radiation waste boiler. The more serious the steam attenuation, the more serious the ash accumulation. For conventional gasifier radiation waste boilers, the steam production may drop to 60% or even lower of the steam volume during normal operation after one month of operation. If the attenuation is too serious, the radiation waste boiler will not work properly. In addition, as the amount of ash deposits increases, severe deposition will block the gas channel and cause equipment shutdown. With the continuous increase in the scale of gasifiers (currently, water-coal slurry gasifiers have achieved a single furnace daily processing of 4,000 tons of coal), in addition to the cylindrical water-cooled wall, the radiation waste boiler is generally equipped with a radiation screen water-cooled wall to increase the heat exchange area without increasing the height of the equipment, thereby making the structure of the internal parts of the radiation waste boiler more complicated. The complex internal structure will make the surface of the water-cooled wall more prone to dust accumulation. Therefore, how to reduce the wall dust accumulation and ensure the long-term operation of the radiation waste boiler is an important issue in this field.

[0004] The installation of soot blowing devices is currently one of the main means to ensure the long-term operation of radiation waste boiler devices. However, the soot blowing devices in the prior art have poor blowing effects, the soot accumulation is not blown thoroughly, and the operation cycle of the radiation waste boiler still needs to be further improved. In addition, the soot blowing process in the prior art causes the purge gas to cause great disturbance to the synthesis gas, affecting the stability of the device operation. Summary of the invention

[0005] The technical problem solved by the present invention is to overcome the defects of the prior art radiation waste boiler, that is, the sootblowing device of the sootblowing device has poor blowing effect, which leads to ash deposition on the surface of the water-cooled wall, a significant reduction in steam production, and strong disturbance of the syngas by the purge gas, resulting in poor operating stability of the device, and provide a water-cooled wall assembly with a sootblowing device, a radiation waste boiler, a gasifier and a sootblowing method. The water-cooled wall assembly with a sootblowing device of the present invention further improves the sootblowing effect of the water-cooled wall, effectively reduces the ash deposition on the surface of the water-cooled wall, significantly reduces the decrease in steam production, and further extends the operating cycle of the device; at the same time, the sootblowing method of the present invention reduces the disturbance of the syngas by the purge gas, and improves the stability of the device operation.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a water-cooled wall assembly with a sootblowing device, which comprises a barrel water-cooled wall, wherein the barrel water-cooled wall is arranged to form a crude synthesis gas channel;

[0008] A finned water-cooled wall group, wherein the finned water-cooled wall group comprises a plurality of finned water-cooled walls, the plurality of finned water-cooled walls are arranged in the crude synthesis gas channel and are spaced apart along the circumference thereof, and each of the finned water-cooled walls extends from the cylinder water-cooled wall toward the central axis direction of the crude synthesis gas channel;

[0009] Sootblower, the sootblower comprising a barrel water-cooled wall sootblower and a fin water-cooled wall sootblower;

[0010] The cylinder water-cooled wall soot blowing pipe is arranged on the cylinder water-cooled wall between two adjacent fin water-cooled walls, the cylinder water-cooled wall soot blowing pipe is circumferentially provided with at least one cylinder water-cooled wall soot blowing hole, the opening direction of the cylinder water-cooled wall soot blowing hole is parallel to the tangent direction, the cylinder water-cooled wall soot blowing pipe extends axially and is provided with a plurality of the cylinder water-cooled wall soot blowing holes at intervals along the axial direction;

[0011] The fin water wall soot blowing tube is arranged at one end of the fin water wall away from the central axis, the fin water wall soot blowing tube is circumferentially provided with at least one fin water wall soot blowing hole, the angle θ between the opening direction of the fin water wall soot blowing hole and the extension direction of the fin water wall is 5-30°, the fin water wall soot blowing tube extends axially and is provided with a plurality of the fin water wall soot blowing holes spaced apart along the axial direction;

[0012] The tangent direction is the tangent direction of the cylinder water-cooled wall at the location of the cylinder water-cooled wall sootblower, the opening direction is the direction in which the gas is blown out from the opening, and the axial direction is the direction in which the central axis extends.

[0013] In the present invention, the number of the finned water-cooled walls included in the finned water-cooled wall group can be conventional in the art, preferably 8, 12 or 16.

[0014] In the present invention, preferably, the plurality of fin water-cooled walls are distributed at equal intervals.

[0015] In the present invention, preferably, one cylindrical water-cooled wall soot blowing pipe is arranged between two adjacent finned water-cooled walls.

[0016] Preferably, the distance between the soot blowing pipe of the cylinder water-cooled wall and two adjacent fin water-cooled walls is equal.

[0017] In the present invention, the soot blowing pipe of the cylinder water-cooled wall is preferably arranged on the connecting rib plate of the cylinder water-cooled wall.

[0018] In the present invention, preferably, the cylinder water-cooled wall soot blowing pipe is circumferentially provided with two cylinder water-cooled wall soot blowing holes.

[0019] Preferably, a line connecting two soot blowing holes of the cylinder water-cooled wall is parallel to the tangent direction.

[0020] In the present invention, preferably, along the axial direction, the plurality of soot blowing holes of the water-cooled wall of the cylinder are arranged in a straight line parallel to the axial direction.

[0021] In the present invention, along the axial direction, the distance between two adjacent soot blowing holes in the water-cooled wall of the cylinder is preferably 300-1000 mm, more preferably 500 mm.

[0022] In the present invention, the angle θ is preferably 20°.

[0023] In the present invention, preferably, two fin water-cooled wall soot blowing holes are circumferentially arranged on the fin water-cooled wall soot blowing pipe.

[0024] Preferably, the two soot blowing holes of the finned water-cooled wall are symmetrically arranged with respect to the extending direction of the finned water-cooled wall.

[0025] In the present invention, preferably, along the axial direction, the plurality of soot blowing holes of the fin water-cooled wall form a straight line parallel to the axial direction.

[0026] In the present invention, the distance between two adjacent soot blowing holes of the finned water-cooled wall soot blowing pipe along the axial direction is preferably 300-1000 mm, more preferably 500 mm.

[0027] In the present invention, the finned water-cooled wall soot blowing tube can replace the last water-cooled tube of the finned water-cooled wall or be arranged on the connecting rib plate where the straight line where the finned water-cooled wall is located intersects with the barrel water-cooled wall.

[0028] The shell water-cooled wall soot blowing pipe and the fin water-cooled wall soot blowing pipe are arranged on the connecting rib plate to form an embedded setting, which can ensure the smooth surface of the radiation waste boiler water-cooled wall, effectively reduce the ash deposition on the water-cooled wall surface, fully ensure the heat exchange effect and steam production of the radiation waste boiler, and also facilitate manufacturing and installation, and have a high ability to resist deformation.

[0029] In the present invention, preferably, the outer diameters of the cylindrical water-cooled wall soot blowing tube and the finned water-cooled wall soot blowing tube are independently 10 to 40 mm, more preferably 20 to 30 mm, for example 25 mm.

[0030] In the present invention, preferably, the diameters of the soot blowing holes of the cylinder water-cooled wall and the soot blowing holes of the fin water-cooled wall are independently 3 mm to 10 mm, for example, 5 mm.

[0031] In the present invention, preferably, the water-cooled wall assembly with a sootblowing device is divided into 2 to 8 sector-shaped areas with the same central angle in the circumferential direction, and the cylinder water-cooled wall sootblowing pipe and the fin water-cooled wall sootblowing pipe in each sector-shaped area are controlled by the same valve; more preferably, the number of sectors is 4.

[0032] In the present invention, the water-cooled wall assembly with a sootblowing device preferably also includes an upper header and a lower header, the upper end of each of the finned water-cooled walls and the upper end of the barrel water-cooled wall are connected to the upper header, and the lower end of each of the finned water-cooled walls and the lower end of the barrel water-cooled wall are connected to the lower header.

[0033] In the present invention, the water-cooled wall assembly with sootblowing device preferably further includes a cooling water distribution main pipe, and the cooling water distribution main pipe is connected to the lower header.

[0034] In the present invention, the water-cooled wall assembly with sootblowing device preferably further includes a steam-water distribution main pipe, and the water distribution main pipe is connected to the upper header.

[0035] The present invention also provides a radiation waste boiler, which comprises the water-cooled wall assembly with the soot blowing device as described above.

[0036] In the present invention, those skilled in the art can generally understand that the radiation waste boiler also includes a shell, which is arranged around the outer periphery of the water-cooled wall of the cylinder, the top of the shell is contracted into a raw synthesis gas inlet, and the bottom of the shell is contracted into a synthesis gas outlet.

[0037] Preferably, a purge gas inlet is provided on the shell, and the purge gas enters the sootblowing tube through the purge gas inlet.

[0038] Preferably, the cooling water distribution main pipe passes through the shell and communicates with the lower header.

[0039] Preferably, the steam-water distribution main pipe passes through the shell and is connected with the upper header.

[0040] The present invention also provides a soot blowing method, which is carried out in the radiation waste boiler as described above, and comprises the following steps: introducing a purge gas into the soot blowing pipe.

[0041] Preferably, the water-cooled wall assembly with a sootblowing device is divided into 2 to 8 sector-shaped areas with the same central angle along the circumferential direction. When the barrel water-cooled wall sootblowing pipe and the fin water-cooled wall sootblowing pipe in each sector-shaped area are controlled by the same valve, the valve of one sector-shaped area is opened in turn along the circumferential direction for blowing. More preferably, the number of the sector-shaped areas is 4.

[0042] The purge time of each sector area is preferably 30 to 120 seconds, more preferably 60 seconds.

[0043] The interval between purging two adjacent sector-shaped areas is preferably 1 to 3 hours, more preferably 2 hours.

[0044] In the present invention, the purge gas may be conventional in the art, preferably N2, CO2 or high-pressure synthesis gas.

[0045] In the present invention, the pressure of the purge gas is preferably 1.1 to 1.5 times, more preferably 1.2 times, the operating pressure of the gasifier.

[0046] In the present invention, the temperature of the purge gas may be conventional in the art, preferably higher than 100°C, more preferably 200°C.

[0047] In the present invention, preferably, before the purge gas is introduced for soot blowing, protective gas is introduced into the cylinder water-cooled wall soot blowing pipe and the fin water-cooled wall soot blowing pipe for protection.

[0048] The flow rate of the protective gas is preferably 1000-3000 Nm 3 / h, preferably 1500Nm 3 / h.

[0049] Before purging, a small flow of purge gas is introduced for protection. On the one hand, it protects the sootblowing tube from damage at high temperature. On the other hand, it can form air flow disturbance on the surface of the water-cooled wall and slow down ash deposition.

[0050] The protective gas may be conventional in the art, preferably the purge gas as described above, and more preferably N2.

[0051] The present invention also provides a gasifier, which comprises the radiation waste pot as described above.

[0052] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0053] The reagents and raw materials used in the present invention are commercially available.

[0054] The positive progressive effect of the present invention is that the purge gas can simultaneously purge the barrel water-cooled wall and the fin water-cooled wall of the radiation waste boiler through the soot blowing holes arranged on the soot blowing pipe, thereby achieving full coverage of the areas of the radiation waste boiler that are prone to soot accumulation, greatly improving the operating stability of the radiation waste boiler, and after one month of operation, the steam production is not less than 90% of the initial value; the sensible heat recovery method of the present invention reduces the disturbance of the purge gas to the synthesis gas and improves the stability of the device operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic diagram of a water-cooled wall assembly with a sootblowing device according to Example 1;

[0056] Figure 2 a is a schematic diagram of the fin water-cooled wall sootblower structure; Figure 2 b is a schematic diagram of the soot blowing pipe structure of the cylinder water-cooled wall;

[0057] Figure 3 This is a schematic diagram of the structure of the radiation waste pot in Example 1.

[0058] 1-water-cooled wall assembly with soot blowing device; 11-cylinder water-cooled wall; 12-finned water-cooled wall; 13-soot blowing pipe; 131-cylinder water-cooled wall soot blowing pipe; 132-finned water-cooled wall soot blowing pipe; 1311-cylinder water-cooled wall soot blowing hole; 1321-finned water-cooled wall soot blowing hole; S1-sector-shaped area one; S2-sector-shaped area two; S3-sector-shaped area three; S4-sector-shaped area four; 2-shell; 21-crude synthesis gas inlet; 22-synthesis gas outlet; 23-purge gas inlet. DETAILED DESCRIPTION

[0059] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0060] Example 1

[0061] Reference Figure 1 and Figure 2As shown, the water-cooled wall assembly 1 with a sootblowing device comprises a barrel water-cooled wall 11, wherein the barrel water-cooled wall 11 is arranged to form a crude synthesis gas channel; a finned water-cooled wall group 12, wherein the finned water-cooled wall group 12 comprises 8 finned water-cooled walls 12 which are equally spaced along the circumferential direction, and each of the finned water-cooled walls 12 extends from the barrel water-cooled wall 11 toward the central axis direction of the crude synthesis gas channel; and a sootblowing pipe 13, wherein the sootblowing pipe 13 comprises a barrel water-cooled wall sootblowing pipe 131 and Fin water-cooled wall soot blowing pipe 132; a cylinder water-cooled wall soot blowing pipe 131 is arranged on the connecting rib plate of the cylinder water-cooled wall 11 between two adjacent fin water-cooled walls 12, and the distance between the two adjacent fin water-cooled walls 12 is equal; the cylinder water-cooled wall soot blowing pipe 131 is circumferentially provided with two cylinder water-cooled wall soot blowing holes 1311, and the opening direction of the cylinder water-cooled wall soot blowing holes 1311 is parallel to the tangent direction, and the two cylinder water-cooled wall soot blowing holes The line connecting 1311 is also parallel to the tangent direction; the cylinder water-cooled wall soot blowing pipe 131 extends in height and is provided with a plurality of cylinder water-cooled wall soot blowing holes 1311 at intervals in the axial direction; the fin water-cooled wall soot blowing pipe 132 is provided on the connecting rib plate where the fin water-cooled wall 12 extends and intersects with the cylinder water-cooled wall 11, and the fin water-cooled wall soot blowing pipe 132 is provided with two fin water-cooled wall soot blowing holes 132 in the circumferential direction. 1. Two fin water wall soot blowing holes 1321 are symmetrically arranged relative to the extension direction of the fin water wall 12. The angle θ between the opening direction of the two fin water wall soot blowing holes 1321 and the extension direction of the fin water wall 12 is 20°. The fin water wall soot blowing pipe 132 extends along its axial direction and is provided with a plurality of fin water wall soot blowing holes 1321 at intervals along the axial direction. The plurality of fin water wall soot blowing holes 1321 in the axial direction are distributed in a straight line. In the axial direction, the spacing between two adjacent barrel water wall soot blowing holes 1311 and the spacing between two adjacent fin water wall soot blowing holes 1321 are both 500mm; the outer diameters of the barrel water wall soot blowing pipe 131 and the fin water wall soot blowing pipe 132 are both 33mm, and the diameters of the barrel water wall soot blowing holes 1311 and the fin water wall soot blowing holes 1321 are both 5mm.

[0062] Continue to refer to Figure 1 As shown, the water-cooled wall assembly 1 with a sootblowing device is divided into four fan-shaped areas with a central angle of 90 degrees along the circumferential direction, namely fan-shaped area 1 S1, fan-shaped area 2 S2, fan-shaped area 3 S3 and fan-shaped area 4 S4, each fan-shaped area includes two cylinder water-cooled wall sootblowing pipes 131 and two fin water-cooled wall sootblowing pipes 132, and the two cylinder water-cooled wall sootblowing pipes 131 and the two fin water-cooled wall sootblowing pipes 132 in each fan-shaped area are controlled by a valve.

[0063] Reference Figure 3As shown, the radiation waste boiler includes the water-cooled wall assembly 1 with a sootblowing device, a shell 2 arranged around the outer periphery of the barrel water-cooled wall 11, the top of the shell 2 is contracted to form a raw synthesis gas inlet 21, and the bottom of the shell 2 is contracted to form a synthesis gas outlet 22. The shell 2 is provided with a purge gas inlet 23, and the purge gas enters the barrel water-cooled wall sootblowing pipe 131 and the fin water-cooled wall sootblowing pipe 132 through the purge gas inlet 23.

[0064] The entrained-flow coal-water slurry gasifier, including the above-mentioned radiation waste boiler, can process 2,000 tons of coal per day, with an operating pressure of 6.5 MPa, a gasification temperature of 1,300°C, and an effective gas (CO+H2) output of 135,000 Nm 3 / h. High-temperature synthesis gas and ash enter the radiation waste boiler, and the temperature of the radiation waste boiler synthesis gas is 800℃ after cooling by the radiation waste boiler. The by-product steam of the radiation waste boiler is 100t / h. The inner diameter of the radiation waste boiler metal shell 2 is 4.2m, the height of the radiation waste boiler is 20.0m, the diameter of the cylinder water-cooled wall 11 is 3.2m, and the finned water-cooled wall 12 is set in 8 groups and evenly arranged along the circumferential direction. The size of the water-cooled pipe is φ57×7.

[0065] When the above-mentioned fluidized-bed water-coal slurry gasifier is in operation, the synthesis gas at the compressor outlet is used as the purge gas for soot blowing. In a clockwise direction, open the control valve of each sector area in turn for purge, and the purge time is 60s. After the purge of one sector area is completed, open the control valve of the next sector area at an interval of 2h. Purge gas. Before purge, use a small flow of nitrogen to protect the soot blowing pipe. The small flow of protective gas is nitrogen, the temperature is 200℃, and the pressure is not less than 7.5MPa. The purge gas temperature is 200℃~300℃, and the pressure is 7.5~9.0MPa. After one month of operation, the steam production of the radiation waste boiler is not less than 90t / h, that is, not less than 90% of the initial steam production.

[0066] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A water-cooled wall assembly with a sootblowing device, characterized in that: It includes: A cylinder water-cooled wall, wherein the cylinder water-cooled wall is arranged to form a crude synthesis gas passage; A fin water-cooled wall group, wherein the fin water-cooled wall group includes a plurality of fin water-cooled walls, the plurality of fin water-cooled walls are arranged in the crude synthesis gas channel and are distributed at intervals along the circumferential direction, and each of the fin water-cooled walls extends from the cylinder water-cooled wall toward the central axis direction of the crude synthesis gas channel; and a sootblowing pipe, wherein the sootblowing pipe comprises a barrel water-cooled wall sootblowing pipe and a fin water-cooled wall sootblowing pipe; The cylinder water-cooled wall soot blowing pipe is arranged on the cylinder water-cooled wall between two adjacent fin water-cooled walls, the cylinder water-cooled wall soot blowing pipe is circumferentially provided with at least one cylinder water-cooled wall soot blowing hole, the opening direction of the cylinder water-cooled wall soot blowing hole is parallel to the tangent direction, the cylinder water-cooled wall soot blowing pipe extends axially and is provided with a plurality of the cylinder water-cooled wall soot blowing holes at intervals along the axial direction; The fin water-cooled wall soot blowing pipe is arranged at one end of the fin water-cooled wall away from the central axis, the fin water-cooled wall soot blowing pipe is arranged on the connecting rib plate where the straight line where the fin water-cooled wall is located intersects with the cylinder water-cooled wall, the fin water-cooled wall soot blowing pipe is circumferentially provided with at least one fin water-cooled wall soot blowing hole, the angle θ between the opening direction of the fin water-cooled wall soot blowing hole and the extension direction of the fin water-cooled wall is 5-30°, the fin water-cooled wall soot blowing pipe extends axially and a plurality of the fin water-cooled wall soot blowing holes are arranged axially at intervals; The tangent direction is the tangent direction of the cylinder water-cooled wall at the location of the cylinder water-cooled wall sootblower, the opening direction is the direction in which the gas is blown out from the opening, and the axial direction is the direction in which the central axis extends.

2. The water-cooled wall assembly with a sootblowing device according to claim 1, characterized in that: The number of the finned water-cooled walls included in the finned water-cooled wall group is 8, 12 or 16; And / or, the plurality of finned water-cooled walls are distributed at equal intervals along the circumferential direction; And / or, a soot blowing pipe of the cylindrical water-cooled wall is arranged between two adjacent finned water-cooled walls, and the distance between the soot blowing pipe of the cylindrical water-cooled wall and the two adjacent finned water-cooled walls is equal; And / or, the soot blowing pipe of the cylinder water-cooled wall is arranged on the connecting rib plate of the cylinder water-cooled wall; And / or, the cylinder water-cooled wall soot blowing pipe is circumferentially provided with two cylinder water-cooled wall soot blowing holes; And / or, along the axial direction, the plurality of soot blowing holes of the water-cooled wall of the cylinder form a straight line parallel to the axial direction; And / or, along the axial direction, the distance between two adjacent soot blowing holes of the cylinder water-cooled wall is 300-1000 mm.

3. The water-cooled wall assembly with a sootblower according to claim 2, characterized in that: Along the axial direction, the distance between two adjacent soot blowing holes of the cylinder water-cooled wall is 500 mm.

4. The water-cooled wall assembly with a sootblower according to claim 1, characterized in that: The angle θ is 20°; And / or, along the axial direction, the plurality of soot blowing holes of the finned water-cooled wall form a straight line parallel to the axial direction; And / or, along the axial direction, the distance between two adjacent soot blowing holes of the fin water-cooled wall is 300-1000 mm.

5. The water-cooled wall assembly with a sootblower according to claim 4, characterized in that: Along the axial direction, the distance between two adjacent soot blowing holes of the fin water-cooled wall is 500 mm.

6. The water-cooled wall assembly with a sootblower according to claim 1, characterized in that: The finned water-cooled wall soot blowing pipe is provided with two finned water-cooled wall soot blowing holes along the circumferential direction, and the two finned water-cooled wall soot blowing holes are symmetrically arranged relative to the extending direction of the finned water-cooled wall.

7. The water-cooled wall assembly with a sootblower according to claim 1, characterized in that: The outer diameters of the cylinder water-cooled wall soot blowing pipe and the fin water-cooled wall soot blowing pipe are independently 10-40 mm; And / or, the diameters of the soot blowing holes of the cylinder water-cooled wall and the soot blowing holes of the fin water-cooled wall are independently 3 mm to 10 mm.

8. The water-cooled wall assembly with a sootblower according to claim 7, characterized in that: The outer diameters of the cylindrical water-cooled wall soot blowing tube and the fin water-cooled wall soot blowing tube are independently 20-30 mm.

9. The water-cooled wall assembly with a sootblower according to claim 8, characterized in that: The outer diameters of the cylindrical water-cooled wall soot blowing tube and the fin water-cooled wall soot blowing tube are independently 25 mm.

10. The water-cooled wall assembly with a sootblower according to claim 7, characterized in that: The diameters of the soot blowing holes of the cylinder water-cooled wall and the soot blowing holes of the fin water-cooled wall are independently 5 mm.

11. The water-cooled wall assembly with a sootblower according to claim 1, characterized in that: The water-cooled wall assembly with a sootblowing device is divided into 2 to 8 sector-shaped areas with the same central angle in the circumferential direction, and the cylinder water-cooled wall sootblowing pipe and the fin water-cooled wall sootblowing pipe in each sector-shaped area are controlled by the same valve.

12. The water-cooled wall assembly with a sootblower according to claim 11, characterized in that: The number of sector areas is 4.

13. A radiation waste pot, characterized in that: It comprises a water-cooled wall assembly with a sootblowing device as claimed in any one of claims 1 to 12.

14. The radiation waste cooker according to claim 13, characterized in that: The radiation waste boiler also includes a shell arranged around the outer periphery of the water-cooled wall of the cylinder, the top of the shell is contracted to form a raw synthesis gas inlet, the bottom of the shell is contracted to form a synthesis gas outlet, and a purge gas inlet is arranged on the shell, and the purge gas inlet is connected to the sootblower.

15. A sootblowing method, characterized in that: It is carried out in the radiation waste pot as claimed in claim 13 or 14, and comprises the following steps: introducing purge gas into the sootblower.

16. The sootblowing method according to claim 15, characterized in that: The water-cooled wall assembly with a sootblowing device is divided into 2 to 8 sector-shaped areas with the same central angle along the circumferential direction. When the cylinder water-cooled wall sootblowing pipe and the fin water-cooled wall sootblowing pipe in each sector-shaped area are controlled by the same valve, the valves of the sector-shaped areas are opened one by one along the circumferential direction for blowing.

17. The sootblowing method according to claim 16, characterized in that: The number of the sector-shaped areas is 4.

18. The sootblowing method according to claim 16, characterized in that: The purge time of each sector area is 30 to 120 seconds.

19. The sootblowing method according to claim 18, characterized in that: The purge time of each sector area is 60s.

20. The sootblowing method according to claim 16, characterized in that: The interval time between purging two adjacent sector-shaped areas is 1 to 3 hours.

21. The sootblowing method according to claim 20, characterized in that: The interval time between purging two adjacent sector-shaped areas is 2 hours.

22. The sootblowing method according to claim 16, characterized in that: The pressure of the purge gas is 1.1 to 1.5 times the operating pressure of the gasifier.

23. The sootblowing method according to claim 22, characterized in that The pressure of the purge gas is 1.2 times the operating pressure of the gasifier.

24. The sootblowing method according to claim 16, characterized in that: The temperature of the purge gas is higher than 100°C.

25. The sootblowing method according to claim 24, characterized in that The temperature of the purge gas is 200°C.

26. A gasifier, characterized in that: It comprises a radiation waste pot as claimed in claim 13 or 14.

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