Structure for improving safety of air cooling wall of supercritical carbon dioxide boiler
By installing an I-shaped heat exchanger on the inside of the high heat load zone of the air-cooled wall of a supercritical carbon dioxide boiler, the low-temperature working fluid is diverted to increase the flow rate, thus solving the problem of insufficient wall temperature safety after large-scale production and achieving effective control of wall temperature.
Patent Information
- Application Number
- CN202423006795.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-06
AI Technical Summary
With the increasing size of supercritical carbon dioxide boilers, the local wall temperature safety of the air-cooled walls is insufficient, especially in high heat load areas where the wall temperature approaches the material's service limit, and existing technologies lack effective measures.
I-shaped heat exchangers, including radiant heat exchangers on the front wall, rear wall, and left and right side walls, are installed on the inside of the high heat load area of the gas-cooled wall in the furnace. By diverting the low-temperature supercritical carbon dioxide working fluid, the mass flow rate is increased, the heat absorption is reduced, and the wall temperature safety is ensured.
It effectively reduces the heat absorption in the high heat load area of the air-cooled wall, ensures wall temperature safety, avoids material overheating, and improves the safety of supercritical carbon dioxide boilers.
Smart Images
Figure CN223460431U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to supercritical carbon dioxide boiler technical field, concretely is a structure of improving supercritical carbon dioxide boiler gas cooling wall security. BACKGROUND
[0002] At present, supercritical carbon dioxide boilers are all small test boilers, the largest capacity boiler that has been operated is a 5MWe supercritical carbon dioxide boiler, the working medium temperature at the inlet of the boiler gas cooling wall is 475 DEG C, the pressure is about 20MPa, the pressure drop requirement is not high, the mass flow rate is selected to 2170kg / (m 2 ·s), and the austenitic stainless steel material can satisfy the gas cooling wall temperature safety, but the wall temperature margin is also faced with deficiency. After large-scale, the inlet temperature of the supercritical carbon dioxide boiler gas cooling wall is further increased to 500 DEG C and above, the pressure is increased to 25MPa and above, the working medium flow is large, the gas cooling wall pressure drop requirement is strict to ensure the unit efficiency, the gas cooling wall working medium mass flow rate cannot be selected too large, and the supercritical carbon dioxide heat exchange coefficient is only about 0.7 times of steam, so that the gas cooling wall wall temperature is very high in the high load area. The material of the gas cooling wall is selected to the austenitic stainless steel material, and the wall temperature in the high heat load area of the furnace is close to the material use limit, and there is few measures for ensuring the local wall temperature safety of the primary upsurge furnace gas cooling wall after the large-scale of the supercritical carbon dioxide boiler at the present stage. CONTENT
[0003] The utility model discloses in order to solve the above-mentioned supercritical carbon dioxide boiler large-scale furnace gas cooling wall local wall temperature safety problem, hereby proposes a structure of improving supercritical carbon dioxide boiler gas cooling wall security.
[0004] The utility model discloses a structure of improving supercritical carbon dioxide boiler gas cooling wall security, and it specifically includes a plurality of heat exchanger, and the heat exchanger is the I -shaped structure, the heat exchanger includes the front wall radiation heat exchanger, left side wall radiation heat exchanger, back wall radiation heat exchanger and right side wall radiation heat exchanger, and the front wall radiation heat exchanger is set up on the furnace gas cooling wall inboard front wall, and the left side wall radiation heat exchanger is set up on the furnace gas cooling wall inboard left wall, and the back wall radiation heat exchanger is set up on the furnace gas cooling wall inboard back wall, and the right side wall radiation heat exchanger is set up on the furnace gas cooling wall inboard right wall, and the front wall radiation heat exchanger left and right ends are communicated with left side wall radiation heat exchanger and right side wall radiation heat exchanger respectively, and the back wall radiation heat exchanger left and right ends are communicated with left side wall radiation heat exchanger and right side wall radiation heat exchanger respectively.
[0005] Further, the structure further comprises a plurality of inlet headers, the inlet headers are divided into two parts, one part is arranged on the front wall of the furnace gas cooling wall and is communicated with the front wall radiation heat exchanger, and the other part is arranged on the back wall of the furnace gas cooling wall and is communicated with the back wall radiation heat exchanger.
[0006] Further, the structure further comprises a plurality of inlet headers, the inlet headers are divided into two parts, one part is arranged on the front wall of the furnace gas cooling wall and is communicated with the front wall radiation heat exchanger, and the other part is arranged on the back wall of the furnace gas cooling wall and is communicated with the back wall radiation heat exchanger.
[0007] Further, the structure further comprises a plurality of outlet headers, the outlet headers are divided into two parts, one part is arranged on the front wall of the furnace gas cooling wall and is communicated with the front wall radiation heat exchanger, and the other part is arranged on the back wall of the furnace gas cooling wall and is communicated with the back wall radiation heat exchanger.
[0008] Further, the structure further comprises a plurality of outlet headers, the outlet headers are divided into two parts, one part is arranged on the front wall of the furnace gas cooling wall and is communicated with the front wall radiation heat exchanger, and the other part is arranged on the back wall of the furnace gas cooling wall and is communicated with the back wall radiation heat exchanger.
[0009] Further, the structure further comprises a plurality of outlet headers, the outlet headers are divided into two parts, one part is arranged on the front wall of the furnace gas cooling wall and is communicated with the front wall radiation heat exchanger, and the other part is arranged on the back wall of the furnace gas cooling wall and is communicated with the back wall radiation heat exchanger.
[0010] The structure for improving the safety of the supercritical carbon dioxide boiler gas cooling wall has the beneficial effects that:
[0011] (1) The structure for improving the safety of the supercritical carbon dioxide boiler gas cooling wall overcomes the problem of the safety of the local wall temperature of the furnace gas cooling wall after the supercritical carbon dioxide boiler is enlarged, heat exchangers are arranged in the high heat load area of the primary updraft gas cooling wall furnace, four heat exchangers are arranged on the inner sides of the front wall, the back wall and the left and right side walls of the furnace gas cooling wall, the working medium in the heat exchanger is a part of low-temperature supercritical carbon dioxide that is branched out at the inlet of the boiler, the heat exchanger is composed of light pipes and is densely arranged along the surface of the water cooling wall at the same pitch, the heat exchanger as a whole is in the shape of an I-beam, so that the mass flow rate is improved, the wall temperature safety of the heat exchanger is ensured, the heat absorption amount of the gas cooling wall in the high heat load area is reduced, and the wall temperature safety of the gas cooling wall is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0012] The drawings constituting a part of this application serve to provide further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute improper limitations on the present application.
[0013] In the drawings:
[0014] Figure 1 It is a right view of the structure for improving the safety of the supercritical carbon dioxide boiler gas cooling wall of the present application;
[0015] Figure 2 It is a left view of the structure for improving the safety of the supercritical carbon dioxide boiler gas cooling wall of the present application;
[0016] Figure 3 It is a front view of the heat exchanger of the structure for improving the safety of the supercritical carbon dioxide boiler gas cooling wall of the present application;
[0017] Figure 4 It is a plan view of the heat exchanger (not including the inlet header and the outlet header) of the structure for improving the safety of the supercritical carbon dioxide boiler gas cooling wall of the present application;
[0018] Wherein: 1-front wall and left side wall inlet header, 2-front wall and right side wall inlet header, 3-rear wall and left side wall inlet header, 4-rear wall and right side wall inlet header, 5-front wall radiation heat exchanger, 6-left side wall radiation heat exchanger, 7-rear wall radiation heat exchanger, 8-right side wall radiation heat exchanger, 9-front wall and left side wall outlet header, 10-front wall and right side wall outlet header, 11-rear wall and left side wall outlet header, 12-rear wall and right side wall inlet header, 13-furnace gas cooling wall. DETAILED DESCRIPTION
[0019] The technical solutions of the present application will be described clearly and completely in combination with the drawings, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the present application.
[0020] In the description of the utility model, it needs to be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0021] In the description of the utility model, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0022] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict between them.
[0023] Specific implementation method one: see Figures 1-4 Specific description of this embodiment. The structure for improving the safety of supercritical carbon dioxide boiler gas cooling wall specifically includes a plurality of heat exchangers, the heat exchanger as a whole is an I-shaped structure, and the heating surface is also an I-shaped heating surface. The heat exchanger includes two left and right symmetrical heat exchange structures, and the two heat exchange structures are not connected. The heat exchange structure includes a plurality of light pipes, the light pipe is a U-shaped, a plurality of light pipes are arranged at equal intervals, and the two U-shaped heat exchange structures are symmetrically arranged to form the I-shaped structure of the heat exchanger as a whole. The material of the heat exchanger is selected as S30432 austenitic stainless steel.
[0024] The heat exchanger includes a front wall radiation heat exchanger 5, a left side wall radiation heat exchanger 6, a rear wall radiation heat exchanger 7 and a right side wall radiation heat exchanger 8. The front wall radiation heat exchanger 5 is arranged on the inner side of the front wall of the furnace gas cooling wall 13, the left side wall radiation heat exchanger 6 is arranged on the inner side of the left wall of the furnace gas cooling wall 13, the rear wall radiation heat exchanger 7 is arranged on the inner side of the rear wall of the furnace gas cooling wall 13, and the right side wall radiation heat exchanger 8 is arranged on the inner side of the right wall of the furnace gas cooling wall 13. The left and right ends of the front wall radiation heat exchanger 5 are respectively communicated with the left side wall radiation heat exchanger 6 and the right side wall radiation heat exchanger 8. The left and right ends of the rear wall radiation heat exchanger 7 are respectively communicated with the left side wall radiation heat exchanger 6 and the right side wall radiation heat exchanger 8.
[0025] Still include several import headers, import headers are divided into two parts, one part is set on the front wall of the furnace gas cooling wall 13 and the lower end of the front wall radiation heat exchanger 5 communication, the other part is set on the back wall of the furnace gas cooling wall 13 and the lower end of the back wall radiation heat exchanger 7 communication.
[0026] The import header includes front wall and left wall import header 1, front wall and right wall import header 2, back wall and left wall import header 3 and back wall and right wall import header 4, front wall and left wall import header 1 and front wall and right wall import header 2 are set on the front wall of the furnace gas cooling wall 13 and the front wall radiation heat exchanger 5 communication, the working medium flows into the two heat exchange structures of the front wall radiation heat exchanger 5 from the front wall and left wall import header 1 and the front wall and right wall import header 2 respectively, and flows into the heat exchange structure close to the front wall of the left wall radiation heat exchanger 6 and the right wall radiation heat exchanger 8 through the front wall radiation heat exchanger 5; back wall and left wall import header 3 and back wall and right wall import header 4 are set on the back wall of the furnace gas cooling wall 13 and the back wall radiation heat exchanger 7 communication, the working medium flows into the two heat exchange structures of the back wall radiation heat exchanger 7 from the back wall and left wall import header 3 and the back wall and right wall import header 4 respectively, and flows into the heat exchange structure close to the back wall of the left wall radiation heat exchanger 6 and the right wall radiation heat exchanger 8 through the back wall radiation heat exchanger 7.
[0027] Still include several export headers, export headers are divided into two parts, one part is set on the front wall of the furnace gas cooling wall 13 and the upper end of the front wall radiation heat exchanger 5 communication, the other part is set on the back wall of the furnace gas cooling wall 13 and the upper end of the back wall radiation heat exchanger 7 communication.
[0028] The export header includes front wall and left wall export header 9, front wall and right wall export header 10, back wall and left wall export header 11 and back wall and right wall import header 12, front wall and left wall export header 9 and front wall and right wall export header 10 are set on the front wall of the furnace gas cooling wall 13 and the front wall radiation heat exchanger 5 communication, the working medium flowing from the front wall and left wall import header 1 and the front wall and right wall import header 2 finally flows out from the front wall and left wall export header 9 and the front wall and right wall export header 10; back wall and left wall export header 11 and back wall and right wall import header 12 are set on the back wall of the furnace gas cooling wall 13 and the back wall radiation heat exchanger 7 communication, the working medium flowing from the back wall and left wall import header 3 and the back wall and right wall import header 4 finally flows out from the back wall and left wall export header 11 and the back wall and right wall import header 12.
[0029] The specific working process of the structure for improving the safety of the supercritical carbon dioxide boiler gas cooling wall is as follows:
[0030] In operation, part of low-temperature supercritical carbon dioxide working medium enters from the front wall and left wall inlet header 1, the front wall and right wall inlet header 2, the rear wall and left wall inlet header 3, and the rear wall and right wall inlet header 4 at the same time, flows through the front wall radiation heat exchanger 5, the left wall radiation heat exchanger 6, the rear wall radiation heat exchanger 7, and the right wall radiation heat exchanger 8, and flows out from the front wall and left wall inlet header 9, the front wall and right wall outlet header 10, the rear wall and left wall outlet header 11, and the rear wall and right wall inlet header 12.
[0031] In summary of the above-mentioned embodiments, the structure for improving the safety of the supercritical carbon dioxide boiler gas cooling wall overcomes the problem of the safety of the local wall temperature of the furnace gas cooling wall of the supercritical carbon dioxide boiler after the large-scale of the supercritical carbon dioxide boiler, sets the heat exchanger in the high heat load area of the primary updraft gas cooling wall furnace, and arranges the four heat exchangers on the inner sides of the front wall, the rear wall, and the left and right side walls of the furnace gas cooling wall, respectively. The working medium in the heat exchanger is part of the low-temperature supercritical carbon dioxide branched from the boiler inlet. The heat exchanger is composed of light pipes, and is densely arranged along the surface of the water cooling wall at the same pitch. The heat exchanger as a whole is in the shape of an I-beam, so as to improve the mass flow rate and ensure the wall temperature safety of the heat exchanger. At the same time, the heat absorption of the gas cooling wall in the high heat load area is reduced, and the wall temperature safety of the gas cooling wall is ensured.
[0032] The above-mentioned embodiments further specifically describe the purpose, technical scheme, and beneficial effects of the utility model. It should be understood that the above-mentioned embodiments are only specific embodiments of the utility model, and are not used to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A structure for improving the safety of a supercritical carbon dioxide boiler gas cooling wall, characterized by: The heat exchanger comprises several heat exchangers which are in the shape of an I-beam; the heat exchanger comprises a front wall radiant heat exchanger (5), a left side wall radiant heat exchanger (6), a back wall radiant heat exchanger (7) and a right side wall radiant heat exchanger (8), the front wall radiant heat exchanger (5) is arranged on the inner side of the front wall of the furnace gas cooling wall (13), the left side wall radiant heat exchanger (6) is arranged on the inner side of the left wall of the furnace gas cooling wall (13), the back wall radiant heat exchanger (7) is arranged on the inner side of the back wall of the furnace gas cooling wall (13), and the right side wall radiant heat exchanger (8) is arranged on the inner side of the right wall of the furnace gas cooling wall (13); the left and right ends of the front wall radiant heat exchanger (5) are communicated with the left side wall radiant heat exchanger (6) and the right side wall radiant heat exchanger (8) respectively; the left and right ends of the back wall radiant heat exchanger (7) are communicated with the left side wall radiant heat exchanger (6) and the right side wall radiant heat exchanger (8) respectively.
2. The structure for improving safety of a supercritical carbon dioxide boiler gas cooling wall according to claim 1, characterized by: The inlet header is divided into two parts, one part is arranged on the front wall of the furnace gas cooling wall (13) and communicated with the front wall radiant heat exchanger (5), and the other part is arranged on the back wall of the furnace gas cooling wall (13) and communicated with the back wall radiant heat exchanger (7).
3. The structure for improving safety of a supercritical carbon dioxide boiler gas cooling wall according to claim 2, characterized by: The inlet header comprises a front wall and left side wall inlet header (1), a front wall and right side wall inlet header (2), a back wall and left side wall inlet header (3) and a back wall and right side wall inlet header (4), the front wall and left side wall inlet header (1) and the front wall and right side wall inlet header (2) are arranged on the front wall of the furnace gas cooling wall (13) and communicated with the front wall radiant heat exchanger (5); the back wall and left side wall inlet header (3) and the back wall and right side wall inlet header (4) are arranged on the back wall of the furnace gas cooling wall (13) and communicated with the back wall radiant heat exchanger (7).
4. The structure for improving safety of a supercritical carbon dioxide boiler gas cooling wall according to claim 1, characterized by: The outlet header is divided into two parts, one part is arranged on the front wall of the furnace gas cooling wall (13) and communicated with the front wall radiant heat exchanger (5), and the other part is arranged on the back wall of the furnace gas cooling wall (13) and communicated with the back wall radiant heat exchanger (7).
5. The structure for improving safety of a supercritical carbon dioxide boiler gas cooling wall according to claim 4, characterized by: The outlet header comprises a front wall and left side wall outlet header (9), a front wall and right side wall outlet header (10), a back wall and left side wall outlet header (11) and a back wall and right side wall inlet header (12), the front wall and left side wall outlet header (9) and the front wall and right side wall outlet header (10) are arranged on the front wall of the furnace gas cooling wall (13) and communicated with the front wall radiant heat exchanger (5); the back wall and left side wall outlet header (11) and the back wall and right side wall inlet header (12) are arranged on the back wall of the furnace gas cooling wall (13) and communicated with the back wall radiant heat exchanger (7).
6. The structure for improving safety of a supercritical carbon dioxide boiler gas cooling wall according to any one of claims 1 to 5, characterized by: The heat exchanger comprises two heat exchange structures which are arranged symmetrically left and right; the heat exchange structure comprises several light pipes which are in the shape of a Chinese character "fang", and the light pipes are arranged at equal intervals.