Water-cooled screen device for flue of waste heat boiler and waste heat boiler equipment using the same

Abstract

This application relates to the field of municipal solid waste incineration technology, and more particularly to a water-cooled screen device for waste heat boiler flue and a waste heat boiler using the same. The water-cooled screen device for waste heat boiler flue includes multiple sets of membrane water-cooled evaporator screen structures evenly spaced within the waste heat boiler flue. The top of each membrane water-cooled evaporator screen structure is suspended and connected to the top of the waste heat boiler flue, with the screen body extending vertically in the longitudinal direction. The interior of each membrane water-cooled evaporator screen structure consists of multiple steel pipes arranged laterally and extending vertically in the longitudinal direction. This solves the technical problems of insufficient heat absorption capacity of the waste heat boiler's heating surface, leading to high-temperature corrosion of the heating surface by flue gas and easy ash accumulation and blockage, increasing boiler flue gas resistance.

Description

Technical Field

[0001] This application relates to the field of municipal solid waste incineration technology, and in particular to a water-cooled screen device for a waste heat boiler flue and a waste heat boiler equipment using the same. Background Technology

[0002] Municipal solid waste incineration power generation, as a modern method of urban waste treatment, can effectively achieve waste reduction, harmlessness, and resource recovery, and has become a key technological means to solve the problem of urban waste accumulation. The waste heat boiler is the core equipment of the municipal solid waste incineration power generation unit, responsible for absorbing the heat generated by the incinerator burning waste, heating water through heat exchange, and generating high-temperature, high-pressure superheated steam. The superheated steam passes through a steam turbine, converting the steam's thermal energy into mechanical energy. The steam turbine is coaxially connected to the generator rotor, converting the mechanical energy into electrical energy.

[0003] Municipal solid waste incineration involves highly corrosive waste, fluctuating fuel calorific value, and diverse composition. Combustion flue gas carries large amounts of dust, corrosive gases, and other sticky substances, which adhere to the heating surfaces of waste heat boilers, leading to ash and coking. This reduces the heat absorption capacity of the heating surfaces, and the increased flue gas temperature causes severe high-temperature corrosion. Furthermore, even after a typical waste heat boiler is restarted following ash and coke removal during a shutdown for maintenance, high-temperature corrosion of the heating surfaces typically occurs within three months. This shortens the boiler's operating cycle and the service life of the heating surfaces, reducing the boiler's ability to operate safely, stably, and economically. Therefore, there is an urgent need to develop a new technological solution that can improve the heat absorption capacity of waste heat boiler heating surfaces, reduce flue gas temperature, and prevent high-temperature corrosion of the heating surfaces.

[0004] Currently, the mainstream solution in the industry for high-temperature corrosion of waste heat boiler heating surfaces is to enhance online ash and slag removal from waste heat superheating equipment. This technical solution mainly involves increasing the frequency and intensity of existing steam soot blowers and shock wave soot blowers. The existing conventional soot blowing method involves arranging steam soot blowers on the left and right sides of each stage of evaporator and superheater in the horizontal flue, and shock wave soot blowers on the left and right sides of each stage of economizer at the tail end. The steam soot blowers utilize steam generated by the waste heat boiler to blow away the ash and slag on the nearby waste heat boiler heating surfaces. The shock wave soot blowers utilize ignited acetylene, which explodes in a pulse canister to generate a shock wave, blowing off the accumulated ash adhering to the heating surfaces.

[0005] This method of using existing steam soot blowers and shock wave soot blowing has the following drawbacks:

[0006] With the complex changes in the composition and calorific value of municipal solid waste, steam soot blowing and shock wave soot blowing cannot effectively remove ash from equipment and reduce the flue gas temperature of waste heat boilers. Steam soot blowing itself involves high-pressure steam soot blowing on the heating surface, which also has poor water drainage effect. Steam carrying water blows on the heating surface, causing damage and leakage risks to the heating surface tubes. It also increases the steam consumption and acetylene consumption of waste heat boilers, thus increasing production costs.

[0007] Secondly, installing W-shaped or V-shaped screens within the waste heat boiler flue can increase heat absorption capacity, thereby reducing furnace temperature and preventing high-temperature corrosion of the heating surfaces. However, the W-shaped or V-shaped screen structure is prone to ash accumulation and coking, causing blockages, increasing boiler flue gas resistance, leading to increased boiler operating pressure differential, and consequently increasing the load on the induced draft fan, which is detrimental to energy conservation of high-power motor equipment. Furthermore, the structural components used to fix the W-shaped or V-shaped screens inside the furnace are susceptible to corrosion, deformation, and damage, affecting the stability of the W-shaped or V-shaped screens within the furnace and increasing maintenance costs. Utility Model Content

[0008] The purpose of this application is to provide a water-cooled screen device for the flue gas duct of a waste heat boiler and a waste heat boiler equipment using the same, so as to solve the technical problems of insufficient heat absorption capacity of the heating surface of the waste heat boiler, which leads to high-temperature corrosion of the heating surface by flue gas and easy ash accumulation and blockage, increasing the resistance of the boiler flue gas.

[0009] Firstly, this application provides a water-cooled screen device for waste heat boiler flue gas ducts, comprising:

[0010] Multiple sets of membrane water-cooled wall evaporator structures are evenly spaced in the waste heat boiler flue. The top of each membrane water-cooled wall evaporator structure is suspended and connected to the steel frame on the top of the outer boiler of the waste heat boiler flue. The screen body extends vertically in the longitudinal direction.

[0011] The internal structure of each membrane water-cooled wall evaporator is composed of multiple steel pipes arranged in the transverse direction and extending vertically in the longitudinal direction.

[0012] Furthermore, each of the membrane water-cooled wall evaporator structures is arranged sequentially at intervals along the longitudinal direction of the waste heat boiler flue, with the intervals being between 1200 and 1250 mm.

[0013] Furthermore, the multiple steel pipes of each of the aforementioned membrane water-cooled wall evaporator structures are welded together by fins to form a single membrane water-cooled wall evaporator structure; and / or

[0014] The steel pipe is made of 12Cr1MoV alloy steel.

[0015] Furthermore, the spacing between each of the steel pipes is uniform, and the spacing is within 60mm; and / or

[0016] At least five sets of the membrane water-cooled wall evaporator structures are arranged sequentially at intervals along the longitudinal direction within the waste heat boiler flue. The pipes of each membrane water-cooled wall evaporator structure have a diameter of 42mm, and the heat absorption area of ​​each membrane water-cooled wall evaporator structure is at least 40m². 2 .

[0017] Furthermore, the lower part of each membrane water-cooled wall evaporator structure is connected to the inlet header, and the top part is connected to the outlet header. The inlet header is connected to the steam drum downcomer, and the outlet header is connected to the waste heat boiler steam drum through the steam drum connecting pipe to form a circulation.

[0018] Furthermore, multiple steam drum downcomers are provided, each steam drum downcomer being connected to a corresponding membrane water-cooled wall evaporator structure; or

[0019] One or more steam drum downpipes are provided, and the number of steam drum downpipes is less than the number of membrane water-cooled wall evaporator structures. Each steam drum downpipe is provided with multiple branch connecting pipes, and the number of branch connecting pipes is the same as the number of membrane water-cooled wall evaporator structures and they are connected in a one-to-one correspondence.

[0020] Furthermore, the lower windward surface of each of the aforementioned membrane water-cooled wall evaporator structures is protected with castable refractory; and / or

[0021] The lower windward section of each membrane water-cooled wall evaporator structure is inclined and bent, and correspondingly, the lower windward section of each steel pipe within each membrane water-cooled wall evaporator structure is inclined and bent.

[0022] Secondly, the waste heat boiler equipment provided in this application includes the waste heat boiler flue water cooling screen device described in any one of the preceding statements.

[0023] Furthermore, the water-cooled screen device is arranged in the waste heat boiler flue in the middle section of the waste heat boiler equipment.

[0024] Furthermore, the waste heat boiler equipment includes a first flue, a second flue, a third flue, and a horizontal flue arranged in sequence, with the water-cooled screen device arranged in the third flue.

[0025] Compared with the prior art, this application provides a waste heat boiler flue water-cooled screen device and a waste heat boiler equipment using the same. This application arranges multiple sets of membrane water-cooled wall evaporator structures with longitudinally extending screens at intervals in the waste heat boiler flue. The interior of this membrane water-cooled wall evaporator structure is composed of multiple steel pipes with longitudinally extending tubes arranged in the transverse direction, so that each membrane water-cooled wall evaporator structure forms a whole water-cooled screen structure. This arrangement can greatly increase the installation area of ​​the water-cooled screen by utilizing the longitudinal space in the waste heat boiler flue, thereby greatly increasing the heat absorption area of ​​the water-cooled screen, improving the heat absorption capacity of the heat-receiving surface of the waste heat boiler flue, reducing the flue gas temperature of the waste heat boiler, and avoiding high-temperature corrosion of the heat-receiving surface of the waste heat boiler.

[0026] Furthermore, this membrane water-cooled wall evaporator structure uses a suspension method to connect its top to the steel beam at the top of the external boiler within the waste heat boiler flue. This eliminates the need for the fixing structures of existing W-shaped and V-shaped screens, thus avoiding the problems of corrosion, deformation, and damage to the fixing components, which could affect the stability of the connection. In addition, the arrangement of this membrane water-cooled wall evaporator structure 10 eliminates areas prone to ash accumulation and blockage, unlike existing W-shaped and V-shaped screens which are prone to ash accumulation and coking due to their curved tube structure. This solves the technical problem of existing technologies causing ash accumulation and blockage, increasing boiler flue gas resistance, leading to increased boiler operating pressure differential, and increasing the operating load of the induced draft fan. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the waste heat boiler equipment provided in the embodiments of this application;

[0029] Figure 2 This is a side view of a water-cooled screen device installed in the flue of a waste heat boiler, as provided in an embodiment of this application.

[0030] Figure 3 This is a top view of the arrangement of the water-cooled screen device installed in the flue of a waste heat boiler, as provided in an embodiment of this application.

[0031] Figure 4 This is a cross-sectional view of the membrane water-cooled wall evaporator structure provided in the embodiments of this application;

[0032] Figure 5This is a schematic diagram of the structure of the waste heat boiler drum and drum connecting pipe provided in an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the connection of the steam drum connecting pipe provided in an embodiment of this application;

[0034] Figure 7 This is a schematic diagram of the connection of the steam drum downcomer provided in one embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the connection of the steam drum downcomer provided in another embodiment of this application.

[0036] Figure label:

[0037] 100-Water-cooled screen device;

[0038] 10- Membrane-type water-cooled wall evaporator screen structure;

[0039] 11-Steel pipe;

[0040] 12 - Lower windward section;

[0041] 21-Structure of the first membrane-type water-cooled wall evaporator screen;

[0042] 22-Second membrane water-cooled wall evaporator structure;

[0043] 23-The structure of the third membrane-type water-cooled wall evaporator;

[0044] 24 - Fourth membrane-type water-cooled wall evaporator structure;

[0045] 25 - Fifth membrane-type water-cooled wall evaporator structure;

[0046] 31 - Imported containers;

[0047] 32 - Export Containers;

[0048] 200- Waste heat boiler equipment;

[0049] 201-1 flue;

[0050] 202-Second flue;

[0051] 203-Three-smoke duct;

[0052] 204 - Horizontal flue;

[0053] 205 - Waste heat boiler steam drum;

[0054] 206 - Steam drum downcomer;

[0055] 2061 - Branch connection pipe;

[0056] 207-Steam drum connecting pipe. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0058] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0059] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0060] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0061] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0062] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0064] like Figures 1 to 8 As shown, this application provides a waste heat boiler flue water-cooled screen device and a waste heat boiler equipment 200 using the water-cooled screen device 100.

[0065] like Figures 2 to 4 As shown in the embodiment of this application, a water-cooled screen device for a waste heat boiler flue is provided. The water-cooled screen device 100 includes multiple sets of membrane water-cooled wall evaporation screen structures 10 evenly spaced in the waste heat boiler flue. The top of each membrane water-cooled wall evaporation screen structure 10 is suspended and connected to the steel frame on the top of the outer boiler of the waste heat boiler flue. The screen body of each membrane water-cooled wall evaporation screen structure 10 extends vertically in the longitudinal direction.

[0066] The interior of each membrane water-cooled wall evaporator structure 10 is composed of multiple steel pipes 11 arranged in the transverse direction and extending vertically in the longitudinal direction to form a whole membrane water-cooled wall evaporator structure 10. Each membrane water-cooled wall evaporator structure 10 may specifically include the outer wall of the screen body and each steel pipe 11 disposed in the outer wall of the screen body.

[0067] Compared with the prior art, the waste heat boiler flue water-cooled screen device 100 provided in this application embodiment is a membrane water-cooled wall evaporator structure 10 with multiple sets of screens extending vertically in the longitudinal direction arranged sequentially in the waste heat boiler flue. This membrane water-cooled wall evaporator structure 10 is composed of multiple steel pipes 11 arranged in the transverse direction and extending vertically in the longitudinal direction. This arrangement can make full use of the longitudinal space in the waste heat boiler flue to greatly increase the number and area of ​​water-cooled screens, greatly increase the heat absorption area of ​​water-cooled screens, thereby improving the heat absorption capacity of the heat-receiving surface of the waste heat boiler flue, reducing the flue gas temperature of the waste heat boiler, and avoiding high-temperature corrosion of the heat-receiving surface of the waste heat boiler.

[0068] Furthermore, this membrane water-cooled wall evaporator structure 10 is suspended and connected to the top steel frame of the external boiler via a hanging load-bearing method. This eliminates the need for existing fixing structures for W-shaped and V-shaped screens, thus avoiding the problems of corrosion, deformation, and damage to the fixing components, which could affect the stability of the connection. In addition, the multiple sets of membrane water-cooled wall evaporator structures 10 provided in this embodiment, as well as the steel pipes 11 within each membrane water-cooled wall evaporator structure 10, are all arranged vertically in a longitudinal direction. There are no areas where ash can easily accumulate and clog between them, unlike existing W-shaped and V-shaped screens, which are prone to ash accumulation and coking due to their curved pipe structure. This solves the technical problem of existing technologies that easily cause ash accumulation and clog, increase boiler flue gas resistance, increase boiler operating pressure difference, and increase the operating load of the induced draft fan.

[0069] Furthermore, the water-cooled screen device 100 provided in the preferred embodiment of this application can be specifically installed in the waste heat boiler flue in the middle section of the waste heat boiler equipment 200. Considering the increased material selection, anti-corrosion and anti-wear process costs of the water-cooled screen device 100, and the protection of the water-cooled screen device 100 body, the arrangement of the water-cooled screen device 100 in the middle section of the waste heat boiler flue is the most effective.

[0070] like Figure 1 and 2 As shown, in a specific embodiment, the waste heat boiler equipment 200 provided in this application embodiment may include a first flue 201, a second flue 202, a third flue 203 and a horizontal flue 204 arranged in sequence, and the water-cooled screen device 100 may be arranged in the third flue 203 in the middle section.

[0071] Since the flue gas from the waste heat boiler absorbs heat through the heating surfaces of the first and second flues 201 and then enters the third flue 203, with a flue temperature of approximately 790 to 700 degrees Celsius, considering the increased material selection for the water-cooled shield device 100, the cost of anti-corrosion and anti-wear processes, and the protection of the water-cooled shield device 100 itself, arranging a water-cooled shield in the temperature section of the third flue 203 is the most suitable and effective solution. By absorbing heat from the high-temperature flue gas inside the waste heat boiler through heat conduction, the original high-temperature flue gas temperature inside the waste heat boiler is reduced, effectively protecting the heating surfaces of the waste heat boiler from high-temperature flue gas corrosion. Furthermore, this not only achieves the goal of reducing flue gas temperature through heat absorption and protecting the superheater in the horizontal flue 204 from high-temperature corrosion, but also reduces the risk of high-temperature corrosion for the water-cooled shield device 100 itself.

[0072] One specific embodiment is, as follows: Figure 4 As shown, the plurality of steel pipes 11 of each membrane water-cooled wall evaporator structure 10 can be welded into a single piece of membrane water-cooled wall evaporator structure 10 through fin welding, resulting in a more robust connection. Furthermore, it is preferable that the steel pipes 11 are made of 12Cr1MoV alloy steel, and preferably that the spacing between each steel pipe 11 is uniform, preferably within 60mm, to ensure the heat absorption capacity and structural stability of each membrane water-cooled wall evaporator structure 10.

[0073] like Figure 3As shown, in a preferred embodiment, the membrane water-cooled wall evaporator structures 10 are arranged sequentially and at intervals along the longitudinal direction of the waste heat boiler flue. Specifically, at least five membrane water-cooled wall evaporator structures 10 can be arranged sequentially and evenly, namely, a first membrane water-cooled wall evaporator structure 21, a second membrane water-cooled wall evaporator structure 22, a third membrane water-cooled wall evaporator structure 23, a fourth membrane water-cooled wall evaporator structure 24, and a fifth membrane water-cooled wall evaporator structure 25. The interval 'a' between two adjacent membrane water-cooled wall evaporator structures 10 can be uniformly arranged between 1200 and 1250 mm. Preferably, the pipes of each membrane water-cooled wall evaporator structure 10 have a diameter of 42 mm, and the heat absorption area of ​​each membrane water-cooled wall evaporator structure 10 is at least 40 m². 2 .

[0074] like Figures 4 to 8 As shown, in one optional embodiment, the lower part of each membrane water-cooled wall evaporator structure 10 can be connected to the inlet header 31, and the top of each membrane water-cooled wall evaporator structure 10 can be connected to the outlet header 32. The inlet header 31 is connected to the steam drum downcomer 206, the steam drum downcomer 206 is connected to the waste heat boiler steam drum 205, and the outlet header 32 is connected to the waste heat boiler steam drum 205 through the steam drum connecting pipe 207 to form a circulation.

[0075] Specifically, the downcomer 206 of the waste heat boiler drum 205 can have a corresponding number of openings. Boiler water enters the inlet header 31 of each membrane water-cooled wall evaporator structure 10 from the downcomer 206. After being heated and evaporated by each membrane water-cooled wall evaporator structure 10, it enters the upper saturated steam connection port of the waste heat boiler drum 205 and enters the waste heat boiler drum 205 through the outlet header 32 and the drum connection pipe 207, forming a natural circulation with the boiler steam-water system.

[0076] Meanwhile, the imported header 31 can also be equipped with a boiler blowdown pipe connected to the boiler blowdown drainage system to ensure the quality of steam and water.

[0077] Regarding the connection arrangement of the steam drum downcomer 206, one optional embodiment is as follows: Figure 7 As shown, one or more steam drum downcomers 206 can be installed, and the number of steam drum downcomers 206 is less than the number of membrane water-cooled wall evaporator structures 10. Each steam drum downcomer 206 has multiple branch connecting pipes 2061, and the number of branch connecting pipes 2061 is the same as the number of membrane water-cooled wall evaporator structures 10, and they are connected one-to-one. Specifically, they can be connected to the inlet header 31 of each membrane water-cooled wall evaporator structure 10. This connection arrangement method makes the pipe layout neater and saves on pipe material costs.

[0078] Another alternative embodiment is, as follows: Figure 8As shown, the same number of steam drum downcomers 206 as the membrane water-cooled wall evaporator structure 10 can be set accordingly, and each steam drum downcomer 206 is directly connected to the inlet header 31 of each membrane water-cooled wall evaporator structure 10. This arrangement is more convenient and simpler.

[0079] In a preferred embodiment, the lower windward surface of each membrane water-cooled wall evaporator structure 10 can be protected with castable refractory to prevent erosion and corrosion by flue gas.

[0080] Another preferred embodiment is, as Figure 2 and Figure 4 As shown, the lower windward section 12 of each membrane water-cooled wall evaporator structure 10 can be inclined and bent. Correspondingly, the lower windward section 12 of each steel pipe 11 inside each membrane water-cooled wall evaporator structure 10 is also inclined and bent. This can reduce air leakage inside the screen and improve sealing.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A water-cooled screen device for waste heat boiler flue, characterized in that, include: Multiple sets of membrane water-cooled wall evaporator structures are evenly spaced in the waste heat boiler flue. The top of each membrane water-cooled wall evaporator structure is suspended and connected to the steel beam at the top of the outer boiler of the waste heat boiler flue. The screen body extends vertically in the longitudinal direction. The internal structure of each membrane water-cooled wall evaporator is composed of multiple steel pipes arranged in the transverse direction and extending vertically in the longitudinal direction.

2. The waste heat boiler flue water-cooled screen device according to claim 1, characterized in that, The membrane water-cooled wall evaporator structures are arranged sequentially at intervals along the longitudinal direction of the waste heat boiler flue, with the intervals being between 1200 and 1250 mm.

3. The waste heat boiler flue water-cooled screen device according to claim 2, characterized in that, The steel pipes of each of the aforementioned membrane water-cooled wall evaporator structures are welded together by fins to form a single membrane water-cooled wall evaporator structure; and / or The steel pipe is made of 12Cr1MoV alloy steel.

4. The waste heat boiler flue water-cooled screen device according to claim 3, characterized in that, The steel pipes are evenly spaced, with the spacing being within 60mm; and / or At least five sets of the membrane water-cooled wall evaporator structures are arranged sequentially at intervals along the longitudinal direction within the waste heat boiler flue. The pipes of each membrane water-cooled wall evaporator structure have a diameter of 42mm, and the heat absorption area of ​​each membrane water-cooled wall evaporator structure is at least 40m². 2 .

5. The waste heat boiler flue water-cooled screen device according to any one of claims 1 to 4, characterized in that, The lower part of each membrane water-cooled wall evaporator structure is connected to the inlet header, and the top part is connected to the outlet header. The inlet header is connected to the steam drum downcomer, and the outlet header is connected to the waste heat boiler steam drum through the steam drum connecting pipe to form a circulation.

6. The waste heat boiler flue water-cooled screen device according to claim 5, characterized in that, Multiple steam drum downcomers are provided, and each steam drum downcomer is connected to a corresponding membrane water-cooled wall evaporator structure; or One or more steam drum downpipes are provided, and the number of steam drum downpipes is less than the number of membrane water-cooled wall evaporator structures. Each steam drum downpipe is provided with multiple branch connecting pipes, and the number of branch connecting pipes is the same as the number of membrane water-cooled wall evaporator structures and they are connected in a one-to-one correspondence.

7. The waste heat boiler flue water-cooled screen device according to claim 5, characterized in that, The lower windward surface of each of the membrane water-cooled wall evaporator structures is protected by a castable refractory; and / or The lower windward section of each membrane water-cooled wall evaporator structure is inclined and bent, and correspondingly, the lower windward section of each steel pipe within each membrane water-cooled wall evaporator structure is inclined and bent.

8. A waste heat boiler device, characterized in that, The waste heat boiler flue water-cooled screen device includes any one of claims 1-7.

9. The waste heat boiler equipment according to claim 8, characterized in that, The water-cooled screen device is arranged in the waste heat boiler flue in the middle section of the waste heat boiler equipment.

10. The waste heat boiler equipment according to claim 9, characterized in that, It includes a first flue, a second flue, a third flue, and a horizontal flue that are arranged in sequence, and the water-cooled screen device is arranged in the third flue.

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