A radiation screen water-cooled wall connection structure and a radiation waste boiler

Abstract

The present invention discloses a connection structure of a radiation screen water-cooled wall and a radiation waste boiler, wherein the connection structure comprises a first connection structure and a second connection structure; both the first connection structure and the second connection structure are tubular forgings, and the tubular forgings comprise a plurality of round tubes, and the round tubes are fixedly connected; the round tubes in the tubular forgings are connected in a one-to-one correspondence with the water-cooling tubes in the radiation screen water-cooled wall, or the round tubes in the tubular forgings are fixedly connected in a one-to-one correspondence with the water-cooling tubes in the radiation screen water-cooled wall; the tubular forgings of the first connection structure are straight tubular forgings; the tubular forgings of the second connection structure are right-angle bent tubular forgings or straight tubular forgings. The first connection structure and the second connection structure of the present invention can improve the support and fixing strength of the radiation screen water-cooled wall, and lay a foundation for ensuring the stable operation of the radiation waste boiler.

Description

Technical Field

[0001] The invention relates to a connection structure of a radiation screen water-cooled wall and a radiation waste pot. Background Art

[0002] Entrained-bed gasification technology is the leading technology for clean and efficient utilization of coal. With the development of gasification technology, further improving the efficiency of energy utilization is an important direction for the development of modern energy and chemical industry. The development of waste boiler quenching type coal gasification technology suitable for methanol, ethylene glycol and hydrocarbon synthesis (FT synthesis) has great strategic significance for promoting sustainable and efficient utilization of resources, achieving near-zero emissions of pollutants and protecting the environment.

[0003] The reaction temperature of entrained-flow gasification is usually about 1300℃ or even higher. The syngas out of the gasification chamber contains a large amount of high-temperature sensible heat. Through the heat exchange between the radiation waste boiler water-cooled wall and the high-temperature syngas, part of the energy can be recovered and utilized to improve the overall efficiency of coal gasification. At present, some gasification technologies have adopted gasifiers with waste boiler devices for heat recovery. The structural design and optimization of the radiation waste boiler is the core and key of this type of gasifier with waste boiler.

[0004] The radiation waste boiler equipment is more complex and larger than the gasification combustion chamber. A certain number of water-cooled walls are arranged on the upper cone section, lower cone section, interior and inner wall of the barrel of the radiation waste boiler, forming the upper cone section water-cooled wall, lower cone section water-cooled wall, radiation screen water-cooled wall and barrel water-cooled wall respectively. The upper cone section water-cooled wall, lower cone section water-cooled wall and barrel water-cooled wall pipe fittings use fins to connect the pipes to form a membrane water-cooled wall. If the radiation screen water-cooled wall inside the radiation waste boiler is arranged in the barrel through the top or bottom pipe penetration method, the overall height of the equipment can be effectively reduced and investment can be saved. Therefore, the fixed support of this water-cooled wall is of great significance to the heat transfer effect and equipment safety.

[0005] The traditional fixed installation method of the radiation screen water-cooled wall is generally as follows: the various water-cooled pipes in the radiation screen water-cooled wall need to be collected into a transfer box structure inside the radiation waste boiler, and the pipes from the transfer box structure pass through the top of the upper cone section and pass through the upper collecting box located between the radiation waste boiler shell and the upper cone section water-cooled wall; the problems caused by this are: 1) the upper cone section is a tapered structure with a narrow top space, which is not conducive to equipment maintenance; and after the pipes are passed through, the processing difficulty of the upper cone section water-cooled wall increases, and the equipment structure is complicated; 2) the transfer box structure in the radiation waste boiler is large in size and easy to accumulate dust.

[0006] Therefore, the reasonable connection and fixation of the radiation screen water-cooled wall with the radiation waste pot at the location where it enters the radiation waste pot is an urgent problem to be solved. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the defects of the prior art such as the complicated fixing and inconvenient maintenance of the radiation screen water-cooled wall, and to provide a connection structure of the radiation screen water-cooled wall and a radiation waste boiler.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] The present invention provides a connection structure of a radiation screen water-cooled wall, which comprises a first connection structure and a second connection structure;

[0010] The first connection structure and the second connection structure are both tubular forgings, and the tubular forgings include a plurality of round tubes, and the round tubes are fixedly connected;

[0011] The round tubes in the tubular forgings are connected to the water cooling tubes in the radiation shield water cooling wall in a one-to-one correspondence or the round tubes in the tubular forgings are sleeved and fixedly connected to the water cooling tubes in the radiation shield water cooling wall in a one-to-one correspondence;

[0012] The tubular forging of the first connecting structure is a straight tubular forging;

[0013] The tubular forging of the second connection structure is a right-angle bent tubular forging or a straight tubular forging.

[0014] In the present invention, preferably, the lengths of the round tubes in the first connection structure and / or the second connection structure are the same.

[0015] In the present invention, preferably, one end of the second connection structure is a flush port, and the other end of the second connection structure is a stepped port, and the slope of the stepped port is 45 degrees.

[0016] In the present invention, preferably, the round tubes in the tubular forgings are fixedly connected by welding or by integrally forming.

[0017] In the present invention, those skilled in the art will know that the first connection structure and the second connection structure are used in conjunction with each other.

[0018] In the present invention, the first connection structure is generally arranged at the lower middle part of the water cooling pipe of the radiation screen water cooling wall, and is used for fixing the water cooling pipe, and can be fixed to the water cooling pipe by welding.

[0019] Among them, when the second connecting structure is a right-angle bent tubular forging, it is generally arranged at the position where the water-cooling pipe of the radiation screen water-cooled wall enters the radiation waste pot or the position where the water-cooling pipe of the radiation screen water-cooled wall passes through the radiation waste pot, and is used to fix the water-cooling pipe. Its structure corresponds to the water-cooling pipe passing through the side wall of the radiation waste pot in the radial direction, and then turning 90 degrees to achieve vertical arrangement in the radiation waste pot cavity; specifically, it can be fixed to the water-cooling pipe by welding, and welded to the cylindrical water-cooled wall of the radiation waste pot to achieve fixation.

[0020] Among them, when the second connecting structure is a straight tubular forging, the second connecting structure is generally arranged at the position where the water-cooling pipe of the radiation shield water-cooled wall enters the radiation waste pot or the position where the water-cooling pipe of the radiation shield water-cooled wall passes through the radiation waste pot, and is used to fix the water-cooling pipe. Its structure corresponds to the water-cooling pipe passing through the side wall of the radiation waste pot in the radial direction. Specifically, it can be fixed to the water-cooling pipe by welding and welded to the outer wall surface of the cylindrical water-cooled wall of the radiation waste pot to achieve fixation.

[0021] In the present invention, the sizes of the round tubes of the first connecting structure and the second connecting structure correspond to the sizes of the water cooling tubes used therein, which are known to those skilled in the art, and generally have an outer diameter of 30 to 80 mm, such as 38 mm, 42 mm, 57 mm or 60 mm.

[0022] In the present invention, the wall thickness of the round tube in the first connection structure and the wall thickness of the round tube in the second connection structure can be increased by 1 to 5 mm, preferably by 1 to 3 mm, according to the wall thickness of the water-cooling tube in the radiation screen water-cooling wall.

[0023] In the present invention, the material grade of the first connection structure and the second connection structure can be the same as the material grade of the radiation screen water-cooled wall, and the surfaces of the first connection structure and the second connection structure have a high temperature resistant material layer, and the thickness of the high temperature resistant material layer is preferably 0.2-0.8 mm.

[0024] The high temperature resistant material may be a conventional high temperature resistant material in the art capable of withstanding temperatures above 800° C., such as silicon carbide material and / or nickel-based material.

[0025] Preferably, the material grade of the first connecting structure and the second connecting structure is better than the material grade of the radiation shield water-cooled wall, such as nickel-based material.

[0026] The material grade of the radiation screen water-cooled wall may be conventional in the art.

[0027] The present invention also provides a radiation waste boiler, which comprises a circumferentially arranged cylindrical water-cooled wall and a vertically arranged radiation shield water-cooled wall, wherein both ends of the radiation shield water-cooled wall are respectively connected to an upper header and a lower header;

[0028] The radiation waste boiler also includes the connection structure of the radiation screen water-cooled wall as described above;

[0029] The outer wall surface of the second connecting structure is fixedly connected to the outer wall surface of the cylinder water-cooling wall;

[0030] One end of the second connection structure is connected or sleeved and fixedly connected to the water cooling pipes in the radiation screen water cooling wall in a one-to-one correspondence, and the other end of the second connection structure is used to connect to the upper header or the lower header;

[0031] The first connection structure is arranged at the middle and lower part of the water cooling pipe in the radiation screen water cooling wall, and both ends of the first connection structure are connected or sleeved and fixedly connected with the water cooling pipe in the radiation screen water cooling wall in a one-to-one correspondence.

[0032] In the present invention, preferably, the first connecting structure is arranged at 1 / 3 of the lower end of the water-cooling tube in the radiation screen water-cooling wall.

[0033] In the present invention, when one end of the second connecting structure is connected or sleeved and fixedly connected with the water-cooling pipes in the radiation screen water-cooled wall in a one-to-one correspondence, and the other end of the second connecting structure is used to connect to the upper header, the radiation screen water-cooled wall is vertically downwardly arranged inside the radiation waste boiler after being connected through the second connecting structure, and the second connecting structure is used to suspend the corresponding radiation screen water-cooled wall above the main water-cooled wall.

[0034] In the present invention, when one end of the second connecting structure is connected or sleeved and fixedly connected with the water-cooling pipes in the radiation screen water-cooled wall in a one-to-one correspondence, and the other end of the second connecting structure is used for connecting or connecting to the lower header, the radiation screen water-cooled wall is vertically arranged upward inside the radiation waste boiler after being connected by the second connecting structure, and the second connecting structure is used to support the corresponding radiation screen water-cooled wall below the main water-cooled wall.

[0035] Generally speaking, a radiation waste boiler may be provided with 2 to 20, preferably 2 to 16 radiation shield water-cooled walls, each of which includes a number of water-cooled pipes, such as 2 to 10.

[0036] Preferably, the number of the first connecting structure and the second connecting structure corresponding to each of the radiation screen water-cooled walls is 1.

[0037] In the present invention, the fixing method may be conventional in the art, such as welding.

[0038] 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.

[0039] The reagents and raw materials used in the present invention are commercially available.

[0040] The positive and progressive effects of the present invention are: 1) the first connection structure and the second connection structure of the present invention can improve the support and fixing strength of the radiation screen water-cooled wall;

[0041] 2) The first connection structure and the second connection structure of the present invention not only ensure the heat exchange effect of the water-cooled wall, but also avoid the system problems caused by the complexity and large size of the traditional connection structure, and at the same time improve the welding stability and simplicity, laying the foundation for ensuring the stable operation of the radiation waste boiler.

[0042] 3) By adopting the connection structure of the present invention in the radiation waste boiler, it is no longer necessary to pass the water-cooling pipes in the radiation screen water-cooling wall through the upper cone section in the radiation waste boiler, thus overcoming the defect of being unfavorable for equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the fixing and supporting structure of the radiation screen water-cooled wall of Example 1.

[0044] Figure 2 This is a schematic diagram of the second connection structure of Example 2.

[0045] Among them, 1-the second connection structure, 2-the welding port, 3-the radiation screen water-cooled wall, and 4-the first connection structure. DETAILED DESCRIPTION

[0046] 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.

[0047] Example 1

[0048] like Figure 1 The connection structure of the radiation screen water-cooled wall shown includes a second connection structure 1 and a first connection structure 4; the second connection structure 1 is a right-angle bent tubular forging, one end of which is a flush port and the other end is a stepped port with a slope of 45 degrees; the first connection structure 4 is a straight tubular forging.

[0049] The round tubes in the second connection structure 1 and the first connection structure 4 are fixedly connected by welding in a row; the first connection structure 4 is arranged at the middle and lower part of the water-cooling pipe of the radiation screen water-cooling wall 3, and is fixedly connected with the water-cooling pipe by welding, so as to fix the water-cooling pipe and prevent the water-cooling pipe from shaking easily; the second connection structure 1 is arranged at the part where the water-cooling pipe of the radiation screen water-cooling wall 3 enters the radiation waste boiler, and is used to fix the water-cooling pipe. Its structure corresponds to that the water-cooling pipe passes through the side wall of the radiation waste boiler radially, and then turns 90 degrees to realize vertical arrangement in the radiation waste boiler cavity; it is fixedly connected with the water-cooling pipe by welding, and is welded to the cylindrical water-cooling wall of the radiation waste boiler to realize fixation.

[0050] The wall thickness of the round tube of the second connection structure 1 and the first connection structure 4 is increased by 2 mm according to the wall thickness of the water-cooling tube in the radiation shield water-cooling wall 3. The material grade of the second connection structure 1 and the first connection structure 4 is equivalent to that of the radiation shield water-cooling wall 3, and the surface of the connection structure is sprayed with 0.5 mm nickel-based metal material.

[0051] Example 2

[0052] like Figure 2 The connection structure of the radiation screen water-cooled wall shown (the first connection structure is omitted and not shown) is different from Example 1 in that the second connection structure 1 is a straight tubular forging with a flush port at one end and a stepped port with a slope of 45 degrees at the other end. The other parts are the same as Example 1.

[0053] Effect Example 1

[0054] Taking a water-coal slurry gasifier with a high-temperature heat recovery device and a single furnace with a daily coal processing capacity of 2,000 tons as an example, the gasification pressure is 6.5MPa, the gasification temperature is 1,350°C, and the effective gas (CO+H2) output is 135,000Nm 3 / h. The inner diameter of the radiation waste boiler metal shell is 4.2m, the height of the vertically arranged cylindrical water-cooled wall in the radiation waste boiler is ~20.0m, the diameter of the cylindrical water-cooled wall in the radiation waste boiler is ~3.30m, and the radiation screen water-cooled wall is evenly arranged along the circumferential direction. Each radiation screen water-cooled wall adopts the connection structure of Example 1. The number of radiation screen water-cooled walls is set to 12, which are evenly arranged inside the radiation waste boiler. Each radiation screen includes 4 water-cooled pipes. The gasification performance parameters of the gasifier with radiation waste boiler are as follows:

[0055] Gasification reaction temperature: ~1350℃;

[0056] Gasification pressure: 6.5MPa;

[0057] Syngas temperature at the outlet of radiation waste boiler: ~800℃;

[0058] Gas-water ratio of syngas in gasification section: ~0.77;

[0059] Specific oxygen consumption: 385Nm 3 O2 / 1000Nm 3 (CO+H2);

[0060] Specific coal consumption: 560kg coal (dry basis) / 1000Nm 3 (CO+H2);

[0061] Effective gas composition (CO+H2): ~81.8% (dry basis);

[0062] Feed water pressure of water-cooled wall boiler: 11.6MPa;

[0063] Feed water temperature of water-cooled wall boiler: 215℃;

[0064] Byproduct steam pressure: 11.1MPa;

[0065] Byproduct steam temperature: 319℃;

[0066] By-product steam volume: ~107t / h.

[0067] Taking a radiation shield water-cooled wall as an example, the connection structure of Example 1 is described as follows: a second connection structure 1 is set at the top of the radiation shield water-cooled wall, and the second connection structure 1 contains an "L"-shaped water channel with the same number of water-cooled pipes as the radiation shield water-cooled wall 3, which can transport the steam-water mixture to the corresponding header, and the second connection structure 1 is welded to the outer wall surface of the cylinder water-cooled wall. A first connection structure 4 is set at the 1 / 3 position of the water-cooled pipe of the radiation shield water-cooled wall 3, and is fixedly connected to the water-cooled pipe in the radiation shield water-cooled wall 3.

[0068] The connection structure in Example 1 can reduce the vibration amplitude of the radiation screen water-cooled wall tube caused by the flow of steam-water mixture in the tube, the change of the flow field in the furnace, etc., and further improve the support and fixing strength.

[0069] 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 connection structure of a radiation screen water-cooled wall, characterized in that: It includes a first connection structure and a second connection structure; The first connection structure and the second connection structure are both tubular forgings, and the tubular forgings include a plurality of round tubes, and the round tubes are fixedly connected; The round tubes in the tubular forgings are connected to the water cooling tubes in the radiation shield water cooling wall in a one-to-one correspondence or the round tubes in the tubular forgings are sleeved and fixedly connected to the water cooling tubes in the radiation shield water cooling wall in a one-to-one correspondence; The tubular forging of the first connecting structure is a straight tubular forging; The tubular forging of the second connection structure is a right-angle bent tubular forging or a straight tubular forging.

2. The connection structure according to claim 1, characterized in that: The lengths of the round tubes in the first connection structure and / or the second connection structure are the same; Alternatively, one end of the second connection structure is a flush port, and the other end of the second connection structure is a stepped port, and the slope of the stepped port is 45 degrees.

3. The connection structure according to claim 1, characterized in that: The round tubes in the tubular forging are fixedly connected in a welding row-type fixed connection manner or an integrally formed row-type fixed connection manner.

4. The connection structure according to claim 1, characterized in that: The tube wall thickness of the round tube in the first connection structure and the tube wall thickness of the round tube in the second connection structure are increased by 1 to 5 mm according to the tube wall thickness of the water-cooling tube in the radiation screen water-cooling wall; And / or, the material grade of the first connecting structure and the second connecting structure is the same as the material grade of the radiation screen water-cooled wall, and the surfaces of the first connecting structure and the second connecting structure have a high temperature resistant material layer; The high temperature resistant material is a high temperature resistant material that can withstand temperatures above 800°C.

5. The connection structure according to claim 4, characterized in that: The thickness of the high temperature resistant material layer is 0.2-0.8 mm.

6. The connection structure according to claim 4, characterized in that: The high temperature resistant material is silicon carbide material and / or nickel-based material.

7. The connection structure according to claim 4, characterized in that: The tube wall thickness of the round tube in the first connection structure and the tube wall thickness of the round tube in the second connection structure are increased by 1 to 3 mm according to the tube wall thickness of the water-cooling tube in the radiation screen water-cooling wall; And / or, the material grade of the first connecting structure and the second connecting structure is better than the material grade of the radiation shield water-cooled wall.

8. The connection structure according to claim 7, characterized in that: The materials of the first connection structure and the second connection structure are nickel-based materials.

9. A radiation waste pot, characterized in that: The radiation waste boiler comprises a circumferentially arranged cylindrical water-cooled wall and a vertically arranged radiation shield water-cooled wall, and the two ends of the radiation shield water-cooled wall are respectively connected to the upper header and the lower header; The radiation waste boiler further comprises a connection structure of the radiation shield water-cooled wall as claimed in any one of claims 1 to 8; The outer wall surface of the second connection structure is fixedly connected to the outer wall surface of the cylinder water-cooling wall; One end of the second connection structure is connected or sleeved and fixedly connected to the water cooling pipes in the radiation screen water cooling wall in a one-to-one correspondence, and the other end of the second connection structure is used to connect to the upper header or the lower header; The first connection structure is arranged at the middle and lower part of the water cooling pipe in the radiation screen water cooling wall, and both ends of the first connection structure are connected or sleeved and fixedly connected with the water cooling pipe in the radiation screen water cooling wall in a one-to-one correspondence.

10. The radiation waste cooker according to claim 9, characterized in that: The first connection structure is arranged at 1 / 3 of the lower end of the water-cooling pipe in the radiation screen water-cooling wall.

11. The radiation waste cooker according to claim 9, characterized in that: The radiation waste boiler is provided with 2 to 20 radiation shield water-cooled walls.

12. The radiation waste cooker according to claim 11, characterized in that: The radiation waste boiler is provided with 2 to 16 radiation screen water-cooled walls inside.

13. The radiation waste cooker according to claim 11, characterized in that: Each of the radiation shield water-cooled walls includes a plurality of water-cooled tubes.

14. The radiation waste cooker according to claim 13, characterized in that: Each of the radiation screen water-cooled walls includes 2 to 10 water-cooled tubes.

15. The radiation waste cooker according to claim 11, characterized in that: The number of the first connecting structure and the number of the second connecting structure corresponding to each of the radiation screen water-cooled walls are both 1.

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