Circulating fluidized bed boiler air chamber structure with water-cooling slag pipe
By adopting membrane water-cooled wall structure and a slag discharge channel of wear-resistant castable in the circulating fluidized bed boiler, the structural problems caused by the expansion of the slag discharge pipe under high temperature environment are solved, and the safe and stable operation of the boiler is achieved.
Patent Information
- Application Number
- CN202411843926.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-14
- Publication Date
- 2025-01-14
AI Technical Summary
The slag pipe in the existing circulating fluidized bed boiler expands under high temperature environment, resulting in structural damage, and the existing metal expansion joints are prone to fatigue damage during long-term use, affecting the safe operation of the boiler.
The air chamber adopts a membrane-type water-cooled wall structure, and the slag discharge pipe is located between the large C-type tube. The slag discharge channel formed by the water-cooled membrane-type wall and wear-resistant castable material ensures that the slag discharge channel and the furnace air chamber are expanded as a whole and avoids expansion difference. , and prevent wear and deformation by tight welding and wear-resistant materials.
Effectively prevent structural damage caused by expansion of the slag discharge pipe, ensure sealing and stability, extend service life, and improve the safe and efficient operation of the boiler.
Smart Images
Figure CN119309198A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a wind chamber structure, in particular to a primary wind chamber structure of a circulating fluidized bed boiler, and belongs to the technical field of circulating fluidized bed boilers. Background Art
[0002] Circulating fluidized bed boilers are usually composed of a combustion system, gas-solid separation and return device, tail convection flue and auxiliary equipment, among which the combustion system is an important component of the circulating fluidized bed boiler. The main operating monitoring parameters such as bed temperature, material layer differential pressure, furnace negative pressure, etc. are all reflected in the boiler combustion system. The adjustment of the combustion system is related to the safety, economy and environmental protection of the entire boiler operation, and its role is very prominent; the combustion system mainly includes the furnace, combustion chamber, air distribution plate and primary air chamber, slag discharge device and other parts.
[0003] The most important component of the slag discharge device is the slag discharge pipe, which continuously or intermittently discharges the solid bed of the boiler to maintain an appropriate height, effectively control the material circulation, and control the differential pressure of the material layer within a reasonable range, so that the combustion reaction is more complete and the thermal efficiency of the boiler is improved. The slag discharge work can also regularly clean the impurities and harmful substances in the bed layer to avoid blockage, coking and corrosion problems in the bed layer. Therefore, the normal operation of the slag discharge pipe is crucial to the stable combustion of the boiler, and the structural form of the slag discharge pipe also determines whether the slag discharge work of the boiler can be carried out safely and stably for a long time.
[0004] The existing slag discharge method is generally to set a slag discharge pipe at the bottom of the furnace of the circulating fluidized bed boiler to discharge the slag in the furnace. The slag discharge pipe uses a whole pipe to pass through the bottom plate of the wind chamber to discharge the slag. The lower end of the slag discharge pipe extends out of the wind chamber and is connected to the slag discharge valve. When slag discharge is required, the slag discharge valve is opened to discharge the ash from the bottom of the furnace through the slag discharge pipe. The upper port of the slag discharge pipe is welded to the slag discharge port on the top air distribution plate of the water-cooled air chamber. The lower end of the slag discharge pipe passes through the water-cooled air chamber and the slag drop pipe outlet hole on the bottom plate of the water-cooled air chamber in turn, and is connected to the slag cooler. The slag discharge pipe and the outlet hole on the bottom plate of the water-cooled air chamber are also fixed together by welding, in order to prevent slag leakage and slag spraying problems at the contact point between the lower part of the slag discharge pipe and the water-cooled wall of the primary air chamber. During the operation of the boiler, high-temperature slag passes through the slag pipe. Since the slag temperature is mostly above 800℃, the slag pipe will have a large axial displacement, causing the expansion of the slag pipe to be greater than the expansion of the boiler body. Although this fixing method solves the problems of slag leakage and slag spraying, it limits the thermal expansion of the slag pipe. When the expansion force exceeds the stress limit of the slag pipe itself, cracks will appear in the weak parts of the pipe, causing the entire slag pipe to break; or when the expansion stress of the slag pipe cannot be completely released, it will cause an impact on the welded part with the slag pipe, causing the welded part with the water-cooled air chamber to crack, resulting in slag failure of the slag pipe and leakage of the water-cooled wall of the primary air chamber.
[0005] For this reason, some improvements have been made to the structural form of the slag discharge pipe in the prior art, and a metal expansion joint has been designed at the slag discharge pipe: some metal expansion joints are designed separately in the primary air chamber, and some metal expansion joints are designed separately outside the primary air chamber. The metal expansion joint is designed in the primary air chamber, and the expansion joint can effectively absorb the thermal expansion of the slag discharge pipe, and solve the problem of fracture and cracking caused by the expansion of the slag discharge pipe. However, the temperature in the primary air chamber is much higher than the ambient temperature. The long-term high temperature and the harsh environment such as the ash leaking into the primary air chamber will have a serious impact on the corrugated part of the expansion joint, which is easy to cause residual deformation of the elastic element of the expansion joint, seriously affecting the service life and safety of the expansion joint; while the metal expansion joint is designed outside the primary air chamber, so that the slag discharge pipe can slide relative to the water-cooled wall of the primary air chamber, which also solves the problem caused by the expansion of the slag discharge pipe, but the ash leaking into the primary air chamber will accumulate at the sliding contact point, causing blockage, causing the slag discharge pipe to get stuck when sliding relative to the water-cooled wall of the primary air chamber, limiting the free expansion of the slag pipe, and the expansion stress cannot be fully released, and stress damage will still occur, affecting the long-term, efficient and safe operation of the boiler.
[0006] Figure 1 The invention shows an expansion sealing structure of a slag discharge pipe of a fluidized bed boiler. The slag discharge pipe 1 is installed in the wind chamber of the furnace. The upper end of the slag discharge pipe 1 is connected to the air distribution plate 2 in the furnace. There are evenly distributed wind caps on the air distribution plate 2. The lower end of the slag discharge pipe 1 extends out of the wind chamber and is connected to the slag discharge valve. When slag discharge is required, the slag discharge valve is opened to discharge the ash and slag from the bottom of the furnace through the slag discharge pipe 1. The wind enters the wind chamber through the air inlet and then enters the furnace through the wind cap. The weight of the entire slag discharge pipe 1 is borne by the weld between the upper end of the slag discharge pipe 1 and the air distribution plate 2. The lower end of the slag discharge pipe 1 passes through the wind chamber bottom plate and is sealed with the wind chamber bottom plate 3 by using a metal expansion joint 5. A gap is left between the lower end of the slag discharge pipe 1 and the wind chamber bottom plate 3 without welding. This structure can meet the expansion sealing requirements in a short time. During long-term operation, especially when the boiler is operated in an intermittent slag discharge mode, the temperature of the slag discharge pipe 1 also changes sharply periodically. The slag discharge pipe 1 frequently expands and contracts with high-temperature slag discharge, which can easily cause fatigue damage and air leakage of the metal expansion joint 5 at the lower end of the slag discharge pipe 1 passing through the wind chamber bottom plate 3, forming an accident hazard and affecting the normal and safe operation of the boiler. Summary of the invention
[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a circulating fluidized bed boiler wind chamber structure with a water-cooled slag pipe to solve the problems existing in the background technology.
[0008] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: A circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe comprises an air chamber composed of a membrane water-cooled wall and a slag discharge pipe, the top wall of the air chamber is an air distribution plate, the upper end of the slag discharge pipe is connected to the air distribution plate, and the lower end of the slag discharge pipe extends out of the air chamber; the membrane water-cooled wall is an airtight tube screen formed by connecting a plurality of large C-shaped tubes side by side with flat steel, the two ends of each large C-shaped tube are respectively connected to the upper right header and the lower right header of the air chamber, and is characterized in that: the slag discharge pipe is located between two adjacent large C-shaped tubes; the slag discharge pipe comprises a slag pipe water-cooled membrane wall and a wear-resistant castable, the slag pipe water-cooled membrane wall encloses a slag discharge channel, and the wear-resistant castable is built in the slag discharge channel.
[0009] In the above-mentioned circulating fluidized bed boiler wind chamber structure with water-cooled slag pipes, the slag pipe water-cooled membrane wall includes a left membrane wall and a right membrane wall, the left membrane wall includes a left flat steel and an inverted C-shaped pipe, the right membrane wall includes a right flat steel and a C-shaped pipe, the left flat steel connects multiple inverted C-shaped pipes side by side to form an airtight pipe screen, and the right flat steel connects multiple C-shaped pipes side by side to form an airtight pipe screen; the inverted C-shaped pipe and the bottom of the C-shaped pipe are enclosed to form a slag discharge channel.
[0010] Furthermore, it also includes a lower left header and an upper left header of the air chamber; the bottom of the inverted C-shaped tube is connected through a left flat steel, and the two ends of the inverted C-shaped tube are respectively connected to the upper left header and the lower left header of the air chamber; the bottom of the C-shaped tube is connected through a right flat steel, and the two ends of the C-shaped tube are respectively connected to the upper right header and the lower right header of the air chamber; the left flat steel and the right flat steel are connected end to end to each other.
[0011] By adopting the above technical scheme, the left membrane wall and the right membrane wall constituting the slag discharge channel of the slag discharge pipe are water-cooled membrane wall structures, and refractory and wear-resistant castables are laid on the inside; the slag discharge channel adopts a water-cooled membrane wall structure, and the working medium temperature inside the left membrane wall and the right membrane wall is consistent with the working medium temperature inside the membrane wall of the furnace wind chamber, so that the slag discharge channel and the furnace wind chamber expand downward as a whole, and there is no expansion difference between the two. At the same time, the membrane wall structure is adopted to ensure the sealing, and the ash and slag will not leak out. Laying refractory and wear-resistant castables on the inside of the slag discharge channel can prevent the left membrane wall and the right membrane wall from being eroded and worn by high-temperature ash and slag and deformed by heat, which may cause damage to the slag discharge device. The added upper left header of the wind chamber, the lower left header of the wind chamber, and the left and right membrane walls are embedded in the original water-cooled wind chamber structure, and are tightly welded to each other to ensure sealing.
[0012] Furthermore, a plurality of inverted C-shaped short tubes are arranged between the upper left header of the air chamber, the lower left header of the air chamber and the inverted C-shaped tube, and each inverted C-shaped short tube is located between two adjacent inverted C-shaped tubes; the bottom of each inverted C-shaped short tube is connected by flat steel, and the two ends of the inverted C-shaped short tube are respectively connected to the upper left header of the air chamber and the lower left header of the air chamber.
[0013] By adopting the above technical solution, multiple inverted C-shaped short tubes are arranged between the upper left header of the wind chamber, the lower left header of the wind chamber and the inverted C-shaped tube, and the open end of the inverted C-shaped tube can be blocked to ensure the sealing of the wind chamber.
[0014] In the above-mentioned circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe, the upper end of the wear-resistant castable built in the slag discharge channel is connected to the bed surface castable on the air distribution plate.
[0015] By adopting the above technical solution, the upper end of the wear-resistant castable built in the slag discharge channel is connected to the bed castable on the air distribution plate, which solves the problem of wear of the traditional slag pipe and significantly improves the operating stability of the boiler.
[0016] In the above-mentioned circulating fluidized bed boiler wind chamber structure with a water-cooled slag pipe, the lower end of the slag discharge pipe is connected with a slag pipe joint.
[0017] By adopting the above technical solution, a slag pipe joint is connected to the lower end of the slag discharge pipe, which can be conveniently connected to facilities such as a slag discharge valve.
[0018] In the above-mentioned circulating fluidized bed boiler wind chamber structure with a water-cooled slag pipe, the cross section of the slag discharge pipe is circular.
[0019] In the above-mentioned circulating fluidized bed boiler wind chamber structure with a water-cooled slag pipe, the cross-section of the slag discharge pipe is rectangular.
[0020] By adopting the above technical solution, the cross-section of the slag discharge pipe can be set to a suitable shape such as circle, rectangle, square, oval, etc. according to actual needs. Beneficial Effects
[0021] The present invention discloses a fluidized bed boiler slag discharge pipe expansion sealing structure, in which the slag discharge pipe is arranged between two large C-shaped pipes originally constituting the wind chamber, and the slag discharge pipe includes a slag pipe water-cooled membrane wall and a wear-resistant castable, the slag pipe water-cooled membrane wall encloses a slag discharge channel, and the wear-resistant castable is built in the slag discharge channel. Since the left membrane wall and the right membrane wall constituting the slag discharge channel of the slag discharge pipe are water-cooled membrane wall structures, the working medium temperature inside the left membrane wall and the right membrane wall is consistent with the working medium temperature inside the membrane wall of the furnace wind chamber, so that the slag discharge channel and the furnace wind chamber expand downward as a whole, and there is no expansion difference between the two. At the same time, the slag discharge channel composed of the membrane water-cooled wall structure and the refractory castable can effectively ensure the sealing of the slag discharge channel, and the ash and slag will not leak out, and can also prevent the left membrane wall and the right membrane wall from being eroded and worn by high-temperature ash and slag and deformed by heat, which may cause the slag discharge device to be damaged. The added upper left header of the air chamber, the lower left header of the air chamber, the left membrane wall and the right membrane wall are embedded in the original water-cooled air chamber structure and are tightly welded to each other to ensure sealing. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1The present invention is a structural schematic diagram of a slag discharge pipe and a wind chamber of a fluidized bed boiler in the prior art.
[0023] Figure 2 It is a top view schematic diagram of the first embodiment of the present invention.
[0024] Figure 3 yes Figure 2 AA section view in .
[0025] Figure 4 yes Figure 2 BB cross-sectional view in .
[0026] Figure 5 It is a top view schematic diagram of the second embodiment of the present invention.
[0027] Figure 6 It is a top view schematic diagram of the third embodiment of the present invention.
[0028] Figure 7 It is a top view schematic diagram of the fourth embodiment of the present invention.
[0029] In the figure: 1 slag discharge pipe, 2 air distribution plate, 3 wind chamber bottom plate, 4 large C-type pipe, 5 metal expansion joint, 6 C-type pipe, 7 inverted C-type short pipe, 8 inverted C-type pipe, 9 wind chamber lower right header, 10 wind chamber upper right header, 11 wind chamber lower left header, 12 wind chamber upper left header, 13 slag pipe joint, 14 wear-resistant castable, 15 flat steel, 16 left flat steel, 17 right flat steel. DETAILED DESCRIPTION
[0030] In order to clearly illustrate the technical features of the present invention, the present invention is further described below through non-limiting embodiments in conjunction with the accompanying drawings. Embodiment 1:
[0031] Please see Figures 2 to 4 , a circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe, including an air chamber composed of a membrane water-cooled wall and a slag discharge pipe, the top wall of the air chamber is an air distribution plate, and a hood assembly connected to the air chamber is arranged on the air distribution plate to provide combustion-supporting air for the furnace, the upper end of the slag discharge pipe is connected to the air distribution plate, and the lower end of the slag discharge pipe extends out of the air chamber; the membrane water-cooled wall is an airtight tube screen formed by connecting a plurality of large C-shaped tubes side by side with flat steel, and the two ends of each large C-shaped tube are respectively connected to the upper right header and the lower right header of the air chamber. In this embodiment, the slag discharge pipe is arranged in the middle position of the air distribution plate, between two adjacent large C-shaped tubes; the slag discharge pipe includes a slag pipe water-cooled membrane wall and a wear-resistant castable, the slag pipe water-cooled membrane wall encloses a slag discharge channel, and the wear-resistant castable is built in the slag discharge channel.
[0032] Specifically, the slag pipe water-cooled membrane wall includes a left membrane wall and a right membrane wall, the left membrane wall includes a left flat steel and an inverted C-shaped tube, the right membrane wall includes a right flat steel and a C-shaped tube, the left flat steel connects multiple inverted C-shaped tubes side by side to form an airtight tube screen, and the right flat steel connects multiple C-shaped tubes side by side to form an airtight tube screen; the inverted C-shaped tube and the bottom of the C-shaped tube are enclosed to form a slag discharge channel with a rectangular cross-section, and the rectangle can be a rectangle or a square.
[0033] The air chamber structure of this embodiment also includes a lower left header and an upper left header of the air chamber; the bottom of the inverted C-shaped tube is connected by a left flat steel, and the two ends of the inverted C-shaped tube are respectively connected to the upper left header and the lower left header of the air chamber; the bottom of the C-shaped tube is connected by a right flat steel, and the two ends of the C-shaped tube are respectively connected to the upper right header and the lower right header of the air chamber; the left flat steel and the right flat steel are connected end to end to each other.
[0034] A plurality of inverted C-shaped short tubes are arranged between the upper left header of the air chamber, the lower left header of the air chamber and the inverted C-shaped tube, and each inverted C-shaped short tube is located between two adjacent inverted C-shaped tubes; the bottom of each inverted C-shaped short tube is connected by flat steel, and the two ends of the inverted C-shaped short tube are respectively connected to the upper left header of the air chamber and the lower left header of the air chamber.
[0035] The upper end of the wear-resistant castable built in the slag discharge channel is connected to the bed castable on the air distribution plate. In order to make the wear-resistant castable built in the slag discharge channel more solid, a plurality of V-shaped gripping nails are arranged on the surface of the slag pipe water-cooling membrane wall, and the V-shaped apex is welded and connected to the surface of the slag pipe water-cooling membrane wall. The gripping nails can also adopt other well-known structures such as Y-shaped.
[0036] The lower end of the slag discharge pipe is connected with a slag pipe joint, the slag pipe joint is connected with a slag discharge valve, and a slag cooler is arranged at the lower part of the slag discharge valve.
[0037] In this embodiment, the wind chamber water-cooled wall is connected to the boiler's overall water (steam) circulation system through the wind chamber upper right header and the wind chamber lower right header, and the slag pipe water-cooled membrane wall is connected to the boiler's overall water (steam) circulation system through the wind chamber upper right header, the wind chamber lower right header, the wind chamber upper left header, and the wind chamber lower left header. Of course, an external independent circulation system can also be connected; the specific circulation loop is: The air chamber right lower header 9 → large C-shaped pipe 4 → air chamber right upper header 10 constitute the main structure of the water-cooled air chamber; The right lower header 9 of the wind chamber → the C-type pipe 6 → the right upper header 10 of the wind chamber constitutes the right membrane wall structure of the slag pipe water-cooled membrane wall; The lower left header 11 of the wind chamber → the reverse C-shaped pipe 8 → the upper left header 12 of the wind chamber constitute the left membrane wall structure of the slag pipe water-cooled membrane wall; The lower left header 11 of the air chamber → the inverted C-shaped short pipe 7 → the upper left header 12 of the air chamber constitute a structure that fills the gap on the left side of the air chamber to ensure the overall sealing of the water-cooled air chamber. Embodiment 2:
[0038] Please see Figure 5 A circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe, wherein the slag pipe water-cooled membrane wall includes a left membrane wall and a right membrane wall, the left membrane wall includes a left flat steel and an inverted C-shaped pipe, the right membrane wall includes a right flat steel and a C-shaped pipe, the left flat steel connects a plurality of inverted C-shaped pipes side by side to form an airtight pipe screen, and the right flat steel connects a plurality of C-shaped pipes side by side to form an airtight pipe screen; the inverted C-shaped pipe and the bottom of the C-shaped pipe are enclosed to form a slag discharge channel with a circular cross section. The remaining structures are the same as those in the first embodiment. Embodiment three:
[0039] Please see Figure 6 A circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe, wherein the slag pipe water-cooled membrane wall includes a left membrane wall and a right membrane wall, the left membrane wall includes a left flat steel and an inverted C-shaped pipe, the right membrane wall includes a right flat steel and a C-shaped pipe, the left flat steel connects a plurality of inverted C-shaped pipes side by side to form an airtight pipe screen, and the right flat steel connects a plurality of C-shaped pipes side by side to form an airtight pipe screen; the inverted C-shaped pipe and the bottom of the C-shaped pipe are enclosed to form a slag discharge channel with an oval cross-section. The remaining structures are the same as those in the first embodiment. Embodiment 4:
[0040] Please see Figure 7 A circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe, wherein the slag pipe water-cooled membrane wall includes a left membrane wall and a right membrane wall, the left membrane wall includes a left flat steel and an inverted C-shaped pipe, the right membrane wall includes a right flat steel and a C-shaped pipe, the left flat steel connects a plurality of inverted C-shaped pipes side by side to form an airtight pipe screen, and the right flat steel connects a plurality of C-shaped pipes side by side to form an airtight pipe screen; the inverted C-shaped pipe and the bottom of the C-shaped pipe are enclosed to form a slag discharge channel with a rectangular cross section. Two slag discharge channels are provided, which are arranged at intervals along the length direction of the air distribution plate, and the specific structure of each slag discharge channel is the same as that of the first embodiment.
[0041] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "left", "right", "front", "back", "up", "down", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. The above terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0042] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection, it can be a direct connection, it can be an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0043] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.
[0044] The embodiments listed above are only for the purpose of understanding the present invention and are not limitations on the technical solutions described in the present invention. Ordinary technicians in the relevant fields can make various changes or deformations based on the technical solutions described in the claims. All equivalent changes or deformations should be included in the scope of protection of the claims of the present invention.
Claims
1. A circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe, comprising an air chamber composed of a membrane water-cooled wall and a slag discharge pipe, the top wall of the air chamber is an air distribution plate, the upper end of the slag discharge pipe is connected to the air distribution plate, and the lower end of the slag discharge pipe extends out of the air chamber; the membrane water-cooled wall is an airtight tube screen formed by connecting a plurality of large C-shaped tubes side by side with flat steel, and the two ends of each large C-shaped tube are respectively connected to the upper right header and the lower right header of the air chamber, and is characterized in that: The slag discharge pipe is located between two adjacent large C-shaped pipes; the slag discharge pipe includes a slag pipe water-cooled membrane wall and wear-resistant castables, the slag pipe water-cooled membrane wall encloses a slag discharge channel, and the wear-resistant castables are built in the slag discharge channel.
2. The circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe according to claim 1, characterized in that: The water-cooled membrane wall of the slag pipe includes a left membrane wall and a right membrane wall. The left membrane wall includes a left flat steel and an inverted C-shaped pipe, and the right membrane wall includes a right flat steel and a C-shaped pipe. The left flat steel connects multiple inverted C-shaped pipes side by side to form an airtight pipe screen, and the right flat steel connects multiple C-shaped pipes side by side to form an airtight pipe screen; the inverted C-shaped pipe and the bottom of the C-shaped pipe are enclosed to form a slag discharge channel.
3. The circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe according to claim 2, characterized in that: It also includes a lower left header and an upper left header of the air chamber; the bottom of the inverted C-shaped tube is connected through a left flat steel, and the two ends of the inverted C-shaped tube are respectively connected to the upper left header and the lower left header of the air chamber; the bottom of the C-shaped tube is connected through a right flat steel, and the two ends of the C-shaped tube are respectively connected to the upper right header and the lower right header of the air chamber; the left flat steel and the right flat steel are connected end to end to each other.
4. The circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe according to claim 3, characterized in that: A plurality of inverted C-shaped short tubes are arranged between the upper left header of the air chamber, the lower left header of the air chamber and the inverted C-shaped tube, and each inverted C-shaped short tube is located between two adjacent inverted C-shaped tubes; the bottom of each inverted C-shaped short tube is connected by flat steel, and the two ends of the inverted C-shaped short tube are respectively connected to the upper left header of the air chamber and the lower left header of the air chamber.
5. The circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe according to claim 1, characterized in that: The upper end of the wear-resistant castable built in the slag discharge channel is connected to the bed surface castable on the air distribution plate.
6. A circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe according to claim 1, 2, 3, 4 or 5, characterized in that: The lower end of the slag discharge pipe is connected with a slag pipe joint.
7. A circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe according to claim 1, 2, 3, 4 or 5, characterized in that: The cross section of the slag tapping pipe is circular.
8. A circulating fluidized bed boiler air chamber structure with a water-cooled slag pipe according to claim 1, 2, 3, 4 or 5, characterized in that: The cross section of the slag tapping pipe is rectangular.