Water wall tube structure and method for front wall of circulating fluidized bed boiler mixed with coal slime

Abstract

The invention discloses a circulating fluidized bed boiler front wall water cooling wall tube structure and method for blending combustion of coal slime, and relates to the technical field of water cooling walls, the circulating fluidized bed boiler front wall water cooling wall tube structure comprises a first water collecting tank and a second water collecting tank, a plurality of heat exchange tubes distributed at equal intervals are arranged on the side walls of the first water collecting tank and the second water collecting tank in a penetrating mode, and fins are arranged on the side wall of each heat exchange tube; the multiple one-way assemblies are arranged at the tops of the inner side walls of the multiple heat exchange pipes correspondingly, and the one-way assemblies are used for limiting the flow direction of fluid in the heat exchange pipes; and the multiple sealing assemblies are arranged at the bottoms of the inner side walls of the multiple heat exchange pipes correspondingly. According to the invention, in the damaged heat exchange tube, the second spring ascends, so that the plug cannot descend, the sealing of the heat exchange tube is realized through the plug and the sealing seat, the subsequent water is prevented from continuously entering, the water is prevented from continuously entering the hearth, the loss of temperature in the hearth is avoided, and dust in the hearth is also prevented from entering the water-cooled wall at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of water-cooled walls, and in particular relates to a water-cooled wall tube structure and method for the front wall of a circulating fluidized bed boiler mixed with coal sludge. Background Art

[0002] A coal-fired boiler is a device that generates steam or hot water by exchanging heat between the heat energy released by coal combustion and water. The working principle of a coal-fired boiler is based on the heat exchange between coal combustion and water. Coal burns in the furnace to produce high-temperature flue gas, which exchanges heat with the water in the drum through the flue tube bundle, heating the water into steam or hot water. During this process, the water in the drum circulates continuously, absorbing and transferring heat. The main components of a coal-fired boiler include the furnace, drum, burner, water-cooled wall, superheater, economizer, air preheater, frame and furnace wall. These components together constitute the core part of the boiler that produces steam, called the boiler body.

[0003] The water-cooled wall is the main heat-receiving part of the boiler. The water-cooled wall tubes laid on the inner surface of the furnace wall not only protect the furnace wall from burning, but also absorb a large amount of radiant heat from the flame and high-temperature flue gas. The water-cooled wall is composed of several rows of steel pipes, distributed around the boiler furnace. Its interior is flowing water or steam, and the outside receives the heat of the flame of the boiler furnace. Due to the harsh environment in the furnace, the water-cooled wall pipes will be damaged. When the water-cooled pipes are damaged, not only the heat exchange efficiency of the water-cooled wall will be reduced, but also the temperature inside the furnace will be reduced. Therefore, in order to avoid the adverse effects of water-cooled pipe damage, a water-cooled wall pipe structure for the front wall of a circulating fluidized bed boiler with coal slurry is needed.

[0004] In the prior art, most water-cooled wall pipes are unable to detect damage and seal damaged water-cooled pipes in time, causing water inside the water-cooled pipes to enter the furnace, resulting in a decrease in the temperature inside the furnace and a decrease in the heat exchange efficiency of the water-cooled wall. At the same time, it also causes dust inside the furnace to enter the pipes of the water-cooled wall, so that the water-cooled wall in the prior art requires higher frequency maintenance to ensure long-term operation of the water-cooled wall. Summary of the invention

[0005] The purpose of the present invention is to provide a water-cooled wall tube structure and method for the front wall of a circulating fluidized bed boiler that burns coal sludge, so as to solve the problem that most water-cooled wall tubes in the prior art cannot be detected for damage and the damaged water-cooled pipes cannot be sealed in time, resulting in water inside the water-cooled pipes entering the furnace, causing the temperature inside the furnace to drop and the heat exchange efficiency of the water-cooled wall to decrease.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides a front wall water-cooled wall tube structure of a circulating fluidized bed boiler for mixing and burning coal sludge, comprising: A first water collecting tank and a second water collecting tank, wherein a plurality of heat exchange tubes distributed at equal distances are provided through the side walls of the first water collecting tank and the second water collecting tank; A sealing assembly is provided at the bottom of the inner wall of each heat exchange tube; The sealing assembly includes: a hollow tube, the outer wall of the hollow tube is provided with a plurality of fixing plates, and the plurality of fixing plates are all fixed to the inner wall of the heat exchange tube; A first piston and a second piston, both of which are slidably disposed on the inner wall of the hollow tube; A connecting rod, which is arranged at the bottom of the second piston; a first spring, the first spring being arranged on the side walls of the first piston and the second piston; A sealing seat, which is arranged at the bottom of the inner wall of the heat exchange tube; A plug is arranged at the bottom of the connecting rod, and the plug is adapted to the sealing seat; A connecting component is arranged at the bottom of the second water collecting tank, and a plurality of adjusting components are arranged on the top of the connecting component, and the plurality of adjusting components correspond to the plurality of plugs one by one and are used to adjust the height of the plugs.

[0007] A further improvement of the present invention is that fins are provided on the side wall of each heat exchange tube.

[0008] A further improvement of the present invention is that a one-way component is provided on the top of the inner side wall of each heat exchange tube, and the one-way component is used to limit the flow direction of the fluid in the heat exchange tube.

[0009] A further improvement of the present invention is that the one-way component comprises: a partition plate, the partition plate is arranged on the top of the inner side wall of the heat exchange tube, and a plurality of through holes distributed at equal distances are opened on the top of the partition plate; A fixing rod, the fixing rod is slidably arranged on the top of the partition; A sealing plate, which is arranged on the top of the fixing rod and is located above the partition; A connecting plate is arranged at the bottom of the fixing rod, a second spring is arranged at the top of the connecting plate, and the second spring is fixed to the partition plate.

[0010] A further improvement of the present invention is that the connection assembly comprises: A guide rail, which is arranged on the inner wall of the bottom of the second water collecting tank; An electric push rod is arranged on the inner wall of the second water collecting tank, and a transmission plate is arranged at the output end of the electric push rod.

[0011] A further improvement of the present invention is that the adjustment component comprises: A slider, the slider is slidably arranged on the top of the guide rail; The extrusion rod is arranged on the top of the slider, and a ball is rotatably arranged on the top of the extrusion rod.

[0012] A further improvement of the present invention is that the adjustment component further comprises: The conical block is arranged at the bottom of the plug, and the outer wall of the conical block contacts the ball.

[0013] A further improvement of the present invention is that the adjustment component further comprises: Two pipe bodies are respectively passed through the outer side walls of the first water collecting tank and the second water collecting tank.

[0014] A further improvement of the present invention is that the adjustment component further comprises: Two flow valves are respectively connected with the two pipe bodies.

[0015] The present invention also provides a method for using the front wall water-cooled wall tube structure of a circulating fluidized bed boiler mixed with coal sludge, comprising: By adjusting the component, under the action of the pressure inside the heat exchange tube that is not damaged, the first piston remains fixed, and then under the action of the first spring, the plug is lowered. In the damaged heat exchange tube, the plug cannot be lowered due to the rise of the first spring, and then the heat exchange tube is sealed by the plug and the sealing seat.

[0016] The present invention has at least the following beneficial technical effects: The present invention provides a water-cooled wall tube structure and method for the front wall of a circulating fluidized bed boiler that burns coal sludge. Through the provision of a plug, a sealing seat, a connecting assembly and an adjusting assembly, the first piston can be kept fixed through the adjusting assembly under the pressure inside a heat exchange tube that is not damaged, and then the plug can be lowered under the action of a first spring. In the damaged heat exchange tube, the plug cannot be lowered due to the rise of the first spring, and then the heat exchange tube is sealed by the plug and the sealing seat, so that subsequent water is prevented from continuing to enter, thereby preventing water from continuing to enter the furnace, preventing the temperature in the furnace from being lost, and also preventing dust in the furnace from entering the water-cooled wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the heat exchange tube of the present invention; Figure 3 The present invention Figure 2A schematic diagram of the partially enlarged structure at center A; Figure 4 The present invention Figure 2 A schematic diagram of the partially enlarged structure at B in the middle; Figure 5 It is a schematic diagram of the structure of the partition, the fixing rod and the connecting plate of the present invention; Figure 6 is a schematic diagram of the cross-sectional structure of the sealing seat of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the hollow tube of the present invention.

[0019] Description of reference numerals: 1. First water collecting tank; 2. Second water collecting tank; 3. Heat exchange tube; 4. Flow valve; 5. Tube body; 6. Sealing plate; 7. Partition plate; 8. Connecting plate; 9. Second spring; 10. Fixed plate; 11. Hollow tube; 12. Connecting rod; 13. Sealing seat; 14. Plug; 15. Conical block; 16. Extrusion rod; 17. Guide rail; 18. Sliding block; 19. Electric push rod; 20. Transmission plate; 21. Fixed rod; 22. First spring; 23. First piston; 24. Second piston. DETAILED DESCRIPTION

[0020] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0026] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Example 1 like Figures 1 to 7As shown, the present embodiment provides a front wall water-cooled wall tube structure of a circulating fluidized bed boiler for burning coal sludge, comprising: A first water collecting tank 1 and a second water collecting tank 2, wherein a plurality of heat exchange tubes 3 distributed at equal distances are provided through the side walls of the first water collecting tank 1 and the second water collecting tank 2; A plurality of sealing components, wherein the plurality of sealing components are respectively arranged at the bottom of the inner side walls of the plurality of heat exchange tubes 3; The sealing components include: A hollow tube 11, the outer wall of the hollow tube 11 is provided with a plurality of fixing plates 10, and the plurality of fixing plates 10 are all fixed to the inner wall of the heat exchange tube 3; A first piston 23 and a second piston 24, both of which are slidably disposed on the inner wall of the hollow tube 11; A connecting rod 12, the connecting rod 12 is arranged at the bottom of the second piston 24; A first spring 22, the first spring 22 is arranged on the side walls of the first piston 23 and the second piston 24; A sealing seat 13, the sealing seat 13 is arranged at the bottom of the inner wall of the heat exchange tube 3; A plug 14 is provided at the bottom of the connecting rod 12, and the plug 14 is adapted to the sealing seat 13; The connecting component is arranged at the bottom of the second water collecting tank 2 , and a plurality of adjusting components are arranged on the top of the connecting component, and the plurality of adjusting components correspond to the plurality of plugs 14 one by one, and the adjusting components are used to adjust the height of the plugs 14 .

[0030] In this embodiment, fins are provided on the side walls of each heat exchange tube 3 to enhance the heat dissipation effect of the heat exchange tube 3. The fins directly increase the contact area between the heat exchange tube and the fluid, thereby allowing more heat to be transferred from the heat exchange tube to the fluid. When the fluid flows through the fins, it will flow around and swirl. This turbulent flow effect enhances the convective heat exchange between the fluid and the heat exchange tube.

[0031] In this embodiment, multiple one-way components are respectively arranged on the top of the inner side walls of multiple heat exchange tubes 3, and the one-way components are used to limit the flow direction of the fluid in the heat exchange tube 3. The one-way components can ensure that the fluid flows in the heat exchange tube in a predetermined direction to avoid the occurrence of backflow or turbulence. By limiting the flow direction of the fluid, the fluid can form a more uniform flow field in the heat exchange tube, reduce eddy currents and dead zones, and thus improve the heat exchange efficiency.

[0032] Furthermore, the one-way component includes: The partition 7 is arranged on the top of the inner wall of the heat exchange tube 3, and a plurality of through holes distributed at equal distances are opened on the top of the partition 7; A fixing rod 21, the fixing rod 21 is slidably arranged on the top of the partition 7; The sealing plate 6 is arranged on the top of the fixing rod 21, and the sealing plate 6 is located above the partition plate 7; The connecting plate 8 is arranged at the bottom of the fixing rod 21 , and a second spring 9 is arranged on the top of the connecting plate 8 , and the second spring 9 and the partition plate 7 are fixed.

[0033] When the water in the heat exchange tube 3 enters the first water collecting tank 1, the water is output through the through hole on the partition 7. When there is no water flow in the heat exchange tube 3, under the action of the second spring 9, the connecting plate 8 and the fixing rod 21 cooperate to make the sealing plate 6 seal the through hole on the partition 7.

[0034] Furthermore, the connection component includes: A guide rail 17, the guide rail 17 is arranged on the inner wall of the bottom of the second water collecting tank 2; The electric push rod 19 is arranged on the inner wall of the second water collecting tank 2 , and a transmission plate 20 is arranged at the output end of the electric push rod 19 .

[0035] The guide rail 17 is arranged on the bottom inner wall of the second water collecting tank 2. This arrangement helps to provide a stable and smooth track for components that need to move in a straight line. The electric push rod 19 is arranged on the inner wall of the second water collecting tank 2. This layout enables the electric push rod to use its own thrust and linear motion characteristics to drive the components connected to it. The transmission plate 20 is arranged at the output end of the electric push rod 19. When the electric push rod 19 is working, its thrust will directly act on the transmission plate 20, thereby driving it to move linearly along the guide rail 17.

[0036] Further, the adjustment component includes: A slider 18, the slider 18 is slidably disposed on the top of the guide rail 17; The extrusion rod 16 is arranged on the top of the slider 18, and a ball is rotatably arranged on the top of the extrusion rod 16.

[0037] When the electric push rod 19 is switched on, the electric push rod 19 drives each slider 18 to move on the guide rail 17 through the transmission plate 20 during operation, and then drives the extrusion rod 16 to move. During the movement of the extrusion rod 16, the plug 14 is lifted up through the ball and the inclined surface of the conical block 15, and the sealing seat 13 is cooperated to achieve the sealing of the heat exchange tube 3. The function of the ball is to contact the inclined surface of the conical block 15 when the extrusion rod 16 moves, reduce the resistance through rolling friction, and provide a stable contact point, so that the force transmission is more stable and effective. The plug 14 is a key component of the sealing device. When it is pushed up, it will cooperate with the sealing seat 13 to achieve the sealing of the heat exchange tube 3. The sealing seat 13 provides a stable sealing surface, which works together with the plug 14 to ensure the sealing effect.

[0038] Furthermore, it also includes: The conical block 15 is arranged at the bottom of the plug 14, and the outer wall of the conical block 15 is in conflict with the ball.

[0039] Furthermore, it also includes: Two pipe bodies 5, the two pipe bodies 5 respectively penetrate the outer side walls of the first water collecting tank 1 and the second water collecting tank 2; Two flow valves 4 are respectively connected to two pipe bodies 5. The two flow valves 4 are directly connected to the two pipe bodies 5 to control the fluid flow through the pipe bodies 5. Such a layout ensures that the connection between the pipe body 5 and the flow valve 4 is both stable and efficient, and is convenient for precise control of the fluid flow.

[0040] Example 2 like Figures 1 to 7 As shown, the present embodiment provides a method for using a front wall water-cooled wall tube structure of a circulating fluidized bed boiler for mixing coal sludge combustion, comprising: By adjusting the assembly, under the action of the pressure inside the heat exchange tube 3 where no damage occurs, the first piston 23 remains fixed, and then under the action of the first spring 22, the plug 14 is lowered. However, inside the damaged heat exchange tube 3, the plug 14 cannot be lowered due to the rising of the first spring 22, and then the heat exchange tube 3 is sealed by the plug 14 and the sealing seat 13.

[0041] Furthermore, the specific working method is: when in use, water enters the second water collecting tank 2 through the flow valve 4 and the pipe body 5 on the second water collecting tank 2, then enters the first water collecting tank 1 through multiple heat exchange tubes 3, and finally is output through the flow valve 4 and the pipe body 5 on the first water collecting tank 1. During this process, the heat in the furnace is absorbed by the water in the heat exchange tube 3.

[0042] During operation, when a large gap appears between the data measured by the two flow valves 4, the switch of the electric push rod 19 is turned on. During operation, the electric push rod 19 drives each slider 18 to move on the guide rail 17 through the transmission plate 20, thereby driving the extrusion rod 16 to move. During the movement of the extrusion rod 16, the plug 14 is raised through the ball and the inclined surface of the conical block 15, and cooperates with the sealing seat 13 to achieve the sealing of the heat exchange tube 3.

[0043] When the plug 14 rises, the second piston 24 rises through the connecting rod 12 to compress the first spring 22 .

[0044] If a heat exchange tube 3 is damaged, water or steam in the heat exchange tube 3 will be lost, and under the action of the partition plate 7, the sealing plate 6, the connecting plate 8, the second spring 9 and the fixing rod 21, the pressure inside the heat exchange tube 3 will be reduced, thereby causing the first piston 23 to rise.

[0045] After the ball on the extrusion rod 16 leaves the conical block 15, the first piston 23 remains fixed under the pressure inside the heat exchange tube 3 that is not damaged, and then under the action of the first spring 22, the plug 14 is lowered. In the damaged heat exchange tube 3, the first spring 22 rises, so that the plug 14 cannot be lowered, and then the heat exchange tube 3 is sealed by the plug 14 and the sealing seat 13, preventing subsequent water from continuing to enter, thereby preventing water from continuing to enter the furnace, preventing the loss of temperature in the furnace, and also preventing dust in the furnace from entering the water-cooled wall.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0047] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A water-cooled wall tube structure for the front wall of a circulating fluidized bed boiler burning coal sludge, characterized in that: include: A first water collecting tank (1) and a second water collecting tank (2), wherein a plurality of heat exchange tubes (3) distributed at equal distances are provided through the side walls of the first water collecting tank (1) and the second water collecting tank (2); A sealing component is provided at the bottom of the inner wall of each heat exchange tube (3); The sealing assembly comprises: a hollow tube (11), the outer wall of the hollow tube (11) being provided with a plurality of fixing plates (10), and the plurality of fixing plates (10) being fixed to the inner wall of the heat exchange tube (3); A first piston (23) and a second piston (24), wherein the first piston (23) and the second piston (24) are both slidably disposed on the inner wall of the hollow tube (11); A connecting rod (12), the connecting rod (12) being arranged at the bottom of the second piston (24); A first spring (22), the first spring (22) being arranged on side walls of the first piston (23) and the second piston (24); A sealing seat (13), the sealing seat (13) being arranged at the bottom of the inner wall of the heat exchange tube (3); A plug (14), the plug (14) being arranged at the bottom of the connecting rod (12), the plug (14) being adapted to fit the sealing seat (13); A connecting component is arranged at the bottom of the second water collecting tank (2), and a plurality of adjusting components are arranged at the top of the connecting component. The plurality of adjusting components correspond to the plurality of plugs (14) in a one-to-one manner and are used to adjust the height of the plugs (14).

2. The water-cooled wall tube structure of the front wall of a circulating fluidized bed boiler for mixing coal sludge combustion according to claim 1, characterized in that: Fins are provided on the side wall of each heat exchange tube (3).

3. The water-cooled wall tube structure of the front wall of a circulating fluidized bed boiler for mixing coal sludge combustion according to claim 1, characterized in that: A one-way component is provided on the top of the inner side wall of each heat exchange tube (3), and the one-way component is used to limit the flow direction of the fluid in the heat exchange tube (3).

4. The water-cooled wall tube structure of the front wall of a circulating fluidized bed boiler for mixing coal sludge as claimed in claim 3, characterized in that: The one-way component comprises: a partition (7), the partition (7) being arranged on the top of the inner wall of the heat exchange tube (3), and a plurality of through holes distributed at equal distances being opened on the top of the partition (7); A fixing rod (21), the fixing rod (21) being slidably disposed on the top of the partition (7); A sealing plate (6), the sealing plate (6) being arranged on the top of the fixing rod (21), and the sealing plate (6) being located above the partition plate (7); A connecting plate (8) is arranged at the bottom of the fixing rod (21), a second spring (9) is arranged at the top of the connecting plate (8), and the second spring (9) and the partition plate (7) are fixed.

5. The water-cooled wall tube structure of the front wall of a circulating fluidized bed boiler for mixing coal sludge combustion according to claim 1, characterized in that: The connection components include: A guide rail (17), the guide rail (17) being arranged on the inner wall of the bottom of the second water collecting tank (2); An electric push rod (19) is arranged on the inner wall of the second water collecting tank (2), and a transmission plate (20) is arranged at the output end of the electric push rod (19).

6. The water-cooled wall tube structure of the front wall of a circulating fluidized bed boiler for mixing coal sludge combustion according to claim 5, characterized in that: The adjustment components include: A slider (18), the slider (18) being slidably disposed on the top of the guide rail (17); An extrusion rod (16) is arranged on the top of the slider (18), and a ball is rotatably arranged on the top of the extrusion rod (16).

7. The water-cooled wall tube structure of the front wall of a circulating fluidized bed boiler for mixing coal sludge combustion according to claim 6, characterized in that: The adjustment components also include: The conical block (15) is arranged at the bottom of the plug (14), and the outer wall of the conical block (15) is in contact with the ball.

8. The water-cooled wall tube structure of the front wall of a circulating fluidized bed boiler for mixing coal sludge combustion according to claim 7, characterized in that: The adjustment components also include: Two tube bodies (5), the two tube bodies (5) respectively penetrate the outer side walls of the first water collecting tank (1) and the second water collecting tank (2).

9. The water-cooled wall tube structure of the front wall of a circulating fluidized bed boiler for mixing coal sludge as claimed in claim 8, characterized in that: The adjustment components also include: Two flow valves (4), the two flow valves (4) are respectively connected to the two pipe bodies (5).

10. A method for using a front wall water-cooled wall tube structure of a circulating fluidized bed boiler for mixing coal sludge combustion according to any one of claims 1 to 9, comprising: By adjusting the assembly, under the action of the pressure inside the heat exchange tube (3) that is not damaged, the first piston (23) remains fixed, and then under the action of the first spring (22), the plug (14) is lowered, while inside the damaged heat exchange tube (3), the plug (14) cannot be lowered due to the rise of the first spring (22), and the heat exchange tube (3) is sealed by the plug (14) and the sealing seat (13).

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