Movable furnace arch and boiler

Abstract

The utility model relates to a movable furnace arch and a corresponding boiler. The movable furnace arch comprises a water-cooling frame and a fire-resistant furnace arch material applied to the water-cooling frame, wherein the water-cooling frame comprises a pivot header, an end header and a water-cooling pipe; the pivot header is used as a pivot of the movable furnace arch, the left end face and the right end face of the movable furnace arch form a membrane wall structure, and a water-cooling grating is arranged on the membrane wall structure. The boiler provided by the utility model is provided with a similar water-cooling grid. The movable furnace arch has the technical effects that the movable furnace arch is provided with the pivot header, so that the movable furnace arch can rotate around the pivot header, the inclination angle is adjustable, and the movable furnace arch can be widely applied to various combustion requirements. Besides, the left side and the right side of the movable boiler arch and the boiler wall are all provided with the water-cooling grilles, so that fuel coking can be reduced or avoided while flue gas is minimized to move upwards through a gap between the movable boiler arch and the boiler wall, and the movable boiler arch is prevented from being changed into a fixed boiler arch.

Description

Technical Field

[0001] The utility model is dedicated to providing a movable furnace arch and a corresponding boiler. Background Art

[0002] The furnace arch is a key part of the boiler to ensure that the fuel is ignited, maintains normal and continuous combustion of the fuel, burns out, and does not burn at too high a temperature. At present, most boilers are designed with special fixed furnace arches based on factors such as the ignition point, volatility, and water content of the target fuel. This type of furnace arch has poor adaptability. Once the fuel changes, problems such as failure to ignite, failure to burn, incomplete combustion, or excessively high combustion temperature (which will cause increased nitrogen oxide emissions) will arise. Some solutions for movable furnace arches have also been proposed in the prior art, but because the temperature of the furnace arch is relatively high, it is easy for the movable furnace arch to become a fixed furnace arch due to fuel coking in the gap between the furnace wall and the movable furnace arch.

[0003] Therefore, there is a need in the art for an improved movable furnace arch. Utility Model Content

[0004] The utility model is dedicated to providing a movable furnace arch and a corresponding boiler which can overcome the above problems.

[0005] Specifically, the utility model provides a movable furnace arch, which includes a water-cooled frame and a refractory furnace arch material applied to the water-cooled frame, wherein the water-cooled frame includes a pivot junction box located on the bottom side of the movable furnace arch, an end junction box located on the top side of the movable furnace arch, and water-cooled pipes connected between the pivot junction box and the end junction box, wherein the left and right end faces of the movable furnace arch are respectively provided with a plurality of side end water-cooling pipes, and the side end water-cooling pipes on each side are welded to each other with inter-tube steel plates, thereby forming a side end membrane wall structure; the pivot junction box is a slender pipe fitting, which serves as the pivot of the movable furnace arch, and the pivot junction box is suitable for passing through the boiler water-cooled wall and being rotatably supported, so that the movable furnace arch can The tilt angle is adjusted by rotating around the pivot coupling, wherein the two side ends of the pivot coupling are respectively provided with a water inlet and a water outlet, so that cooling water can enter the movable furnace arch from the water inlet and flow out from the water outlet; water cooling grilles are also provided on the side end membrane wall structures on the left and right sides of the movable furnace arch, and the water cooling grilles include a plurality of parallel and spaced longitudinal slats and a plurality of transverse slats welded between adjacent longitudinal slats, and the longitudinal slats and transverse slats form a grid structure, and the longitudinal slats and transverse slats of the water cooling grille are respectively welded to the side end water cooling tubes and the steel plates between the tubes of the side end membrane wall structure within the cooling range of the side end membrane wall, thereby achieving water cooling with the help of the side end membrane wall structure.

[0006] According to one aspect of the present invention, one or more baffles are provided in the pivot header and / or the end header to regulate the direction of the cooling water.

[0007] According to one aspect of the present invention, the longitudinal strips are welded to the side water-cooling tubes along the extension direction of the side water-cooling tubes, while the transverse strips are welded to the side water-cooling tubes and the steel plates between the tubes approximately perpendicular to the side water-cooling tubes.

[0008] According to one aspect of the present invention, a power receiving portion is provided at the end of the pivot coupling box so that the pivot coupling box can receive power from outside the boiler to rotate, thereby adjusting the tilt angle.

[0009] The utility model also provides a boiler having the movable furnace arch as described above.

[0010] According to one aspect of the present invention, the furnace wall of the boiler is provided with a furnace wall side water-cooling grille in the movable area of ​​the movable furnace arch, and the furnace wall side water-cooling grille includes a plurality of parallel and spaced longitudinal slats and a plurality of transverse slats welded between adjacent longitudinal slats, and the longitudinal slats and the transverse slats form a grid structure, wherein the longitudinal slats and the transverse slats of the furnace wall side water-cooling grille are welded to the water-cooling pipes and the inter-tube steel plates of the furnace wall membrane wall within the cooling range of the furnace wall membrane wall, thereby achieving water cooling with the help of the furnace wall membrane wall.

[0011] According to one aspect of the present invention, the water-cooling grille of the movable furnace arch is arranged adjacent to the water-cooling grille on the furnace wall side.

[0012] According to one aspect of the present invention, the longitudinal slats of the water-cooling grille on the furnace wall side extend substantially horizontally, and the transverse slats extend substantially vertically.

[0013] According to one aspect of the present invention, the longitudinal slats of the water-cooling grille on the furnace wall side are welded to the water-cooling tubes and the steel plates between the tubes approximately perpendicularly to the water-cooling tubes of the furnace wall membrane wall, and the transverse slats of the water-cooling grille on the furnace wall side are welded to the steel plates between the tubes along the extension direction of the water-cooling tubes of the furnace wall membrane wall.

[0014] According to one aspect of the present invention, a refractory sealing filler is provided between the pivot header of the movable furnace arch and the corresponding boiler water-cooled wall.

[0015] In this utility model, "within the cooling range of the membrane wall" means that the water-cooling grid can maintain a predetermined low temperature through the cooling of the membrane wall. This predetermined low temperature prevents fuel particles carried by flue gas from coking in the gap between the furnace wall and the movable furnace arch. The predetermined temperature will vary for different fuels and can be achieved by adjusting the size of the water-cooling grid, the flow rate of the cooling water, and other factors.

[0016] The technical advantages of this utility model are as follows: the movable furnace arch has a pivot coupling, which allows it to rotate about the pivot coupling, thereby adjusting the inclination angle, thereby being able to adapt to a wide range of combustion requirements. In addition, because water-cooled grilles are installed on both the left and right sides of the movable furnace arch and the boiler wall, the flue gas temperature is reduced while minimizing the upward flow of flue gas through the gap between the movable furnace arch and the furnace wall, preventing fuel coking and thus avoiding the movable furnace arch from becoming a fixed furnace arch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

[0018] Figure 1 A partial cross-sectional view of a boiler using a movable furnace arch according to the present invention is shown;

[0019] Figure 2 A perspective schematic diagram of a movable furnace arch according to an exemplary embodiment of the present utility model is shown;

[0020] Figure 3 A perspective schematic diagram of a water-cooling grille on a furnace wall side according to an exemplary embodiment of the present utility model is shown;

[0021] Figure 4 Shows a water-cooling frame of a movable furnace arch according to an exemplary embodiment of the present invention;

[0022] Figure 5 yes Figure 1 The AA section view in the middle particularly shows the adjacent arrangement of the water-cooling grilles on the movable furnace arch side and the water-cooling grilles on the furnace wall side. DETAILED DESCRIPTION

[0023] The present invention is described below with reference to the embodiments illustrated in the accompanying drawings. It should be noted that the illustrated embodiments are schematic and illustrative only and do not limit the present invention. A person skilled in the art will be able to foresee various equivalent solutions after reading this specification. Furthermore, it should be noted that directional terms such as up, down, left, right, front, and back used herein are defined by reference to the directions in the accompanying drawings. However, this description is intended solely for clarity and convenience in expressing the technical solution and does not constitute a limitation on the present invention.

[0024] like Figure 1 As shown, according to an exemplary embodiment of the present invention, the boiler body has a furnace 4 surrounded by a front arch water-cooled wall 1, a rear arch water-cooled wall 2, and two side wall water-cooled walls 3. At least one movable furnace arch 5 (two are shown in the figure, namely, a front arch 51 on the left and a rear arch 52 on the right) is disposed within the furnace 4. A grate 7 is disposed below the movable furnace arch 5, on which the fuel to be burned is burned.

[0025] It should be noted here that "water-cooled wall" is a well-known term in the art, and is synonymous with "water-cooled membrane wall". It is an airtight tube screen structure welded by water-cooling tubes (usually side-by-side water-cooling tubes with working medium water flowing inside) and steel plates between tube bundles. The water-cooling tubes can be round tubes or non-round tubes. The furnace surrounded by the water-cooled wall has good airtightness and can be heated effectively. Insulation material is laid on the outside of the water-cooled wall, and the structure thus formed can be called a "furnace wall". The "header" mentioned later is also a well-known term in the art, also called a header, which is used to collect the working medium (usually water) in the water-cooling tubes or distribute the collected working medium to each water-cooling tube. It is usually a columnar structure, which can be cylindrical or non-cylindrical, and will not be described in detail.

[0026] Figure 2 and Figure 3 A perspective view showing an exemplary embodiment of a movable furnace arch and a furnace wall area corresponding to the movable area according to the present invention is shown. Figure 4 An exemplary water-cooling frame and cooling water flow path of a movable furnace arch are shown; Figure 5 A side sectional view showing one end of the movable furnace arch when installed on the boiler.

[0027] like Figures 2 to 5 As shown, the movable furnace arch 5 according to the present invention includes a water-cooled frame 10 and a refractory furnace arch material 40 applied to the water-cooled frame 10 (see Figure 4 、 5 ; Figure 2 (not shown), wherein the water-cooling frame 10 includes a pivot header 11 located at the bottom side of the movable furnace arch, an end header 12 located at the top side of the movable furnace arch, and a water-cooling pipe 13 connected between the pivot header 11 and the end header 12. According to the present invention, a plurality of side end water-cooling pipes 13 are respectively provided on the left and right end surfaces of the movable furnace arch 5. The side end water-cooling pipes 13 on each side are aligned vertically and welded with inter-tube steel plates 131 ( Figure 5 ), thereby forming a side end membrane wall structure.

[0028] The pivot joint 11 is a slender pipe member, which serves as the pivot of the movable furnace arch 5. The pivot joint 11 is suitable for passing through the boiler water wall ( Figure 1 In the embodiment, the side wall water-cooled wall 3) is rotatably supported, so that the movable furnace arch 5 can rotate around the pivot header 11 to adjust the tilt angle, wherein the two ends of the pivot header 11 are respectively provided with a water inlet 14 and a water outlet 15, so that cooling water can enter the movable furnace arch 5 from the water inlet 14 and flow out from the water outlet 15. One or more baffles 50 can be optionally provided in the pivot header 11 and / or the end header 12 to control the direction of the cooling water, such as Figure 4 shown.

[0029] According to the present invention, water-cooling grilles 20 are also provided on the membrane wall structures on the left and right sides of the movable furnace arch 5. The water-cooling grilles 20 comprise a plurality of parallel and spaced longitudinal slats 21 and a plurality of transverse slats 22 welded between adjacent longitudinal slats 21. The longitudinal and transverse slats 21, 22 form a grid-like structure. The longitudinal and transverse slats 21, 22 of the water-cooling grilles 20 are welded to the side water-cooling tubes 13 and the inter-tube steel plates 131 of the membrane wall structures within the cooling range of the membrane walls, thereby achieving water cooling via the membrane wall structures. In one feasible embodiment, the longitudinal slats 21 are welded to the side water-cooling tubes 13 along the direction in which the side water-cooling tubes 13 extend, while the transverse slats 22 are welded to the side water-cooling tubes and the inter-tube steel plates 131 approximately perpendicular to the side water-cooling tubes. However, other extension directions of the longitudinal and transverse slats 21, 22 are also feasible, as long as a grid-like structure is formed.

[0030] Furthermore, according to the present invention, Figure 3 、 4 As shown, the boiler's side water-cooled wall 3 is provided with a furnace wall side water-cooling grille 30 in the movable region of the movable furnace arch 5. The furnace wall side water-cooling grille 30 is similar in structure to the movable furnace arch side water-cooling grille 20, both comprising a plurality of parallel and spaced longitudinal slats 31 and a plurality of transverse slats 32 welded between adjacent longitudinal slats 31. The longitudinal slats 31 and transverse slats 32 form a grid-like structure. The longitudinal slats 31 and transverse slats 32 of the furnace wall side water-cooling grille 30 are welded to the water-cooling tubes 33 and inter-tube steel plates 34 of the furnace wall membrane 3 within the cooling range of the furnace wall membrane 3, thereby achieving water cooling via the furnace wall membrane. In a preferred embodiment, the longitudinal slats 31 extend generally horizontally, so that, for example, they can be welded to the water-cooling tubes 33 and inter-tube steel plates approximately perpendicular to the water-cooling tubes 33. The transverse slats 32 extend generally vertically, so that, for example, they can be welded to the inter-tube steel plates along the extension direction of the water-cooling tubes 33. However, other extending directions of the longitudinal slats 31 and the transverse slats 32 are also feasible, as long as a grid-like structure is formed.

[0031] The water cooling grid is preferably made of the same material as the membrane wall.

[0032] So, like Figure 5 As shown in FIG. 1 , when the movable grate arch 5 according to the present invention is installed on the side water-cooled wall 3 of the boiler, the movable grate arch side water-cooling grille 20 and the furnace wall side water-cooling grille 30 are arranged adjacent to each other. A minimum gap, such as 3 to 6 mm, exists between the two adjacent grilles to allow the movable grate arch 5 to move relative to the furnace wall. At this time, when the flue gas below the movable grate arch 5 attempts to ascend along the gap between the movable grate arch side water-cooling grille 20 and the furnace wall side water-cooling grille 30 (such as Figure 5The cross-section of the flue gas path alternates between increasing and decreasing (as indicated by arrow B). This change creates vortices between the meshes of the water-cooling grille, reducing pressure and creating a damping effect, thereby reducing flue gas leakage. Furthermore, since both the movable grate arch water-cooling grilles 20 and the furnace wall water-cooling grilles 30 are water-cooled, this prevents ash from coking on either side of the movable grate arch, potentially turning the movable grate into a fixed grate.

[0033] In order to adjust the inclination angle of the furnace arch, a power receiving part (such as a drive rod, a drive sprocket, a pulley, etc.) can be set at the end of the pivot coupling, so that it can receive power from outside the boiler and rotate, thereby adjusting the inclination angle to adapt to the needs of boiler combustion.

[0034] Furthermore, in order to reduce the smoke leakage at the bottom of the furnace arch, Figure 1 As shown, a refractory sealing filler 53 may be provided between the pivot header 11 of the furnace arch 5 and the corresponding water-cooled wall (ie, the front arch water-cooled wall 1 or the rear arch water-cooled wall 2).

[0035] Although some embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A movable furnace arch, characterized in that: The movable furnace arch includes a water-cooling frame and a refractory furnace arch material applied to the water-cooling frame, wherein the water-cooling frame includes a pivot header located on the bottom side of the movable furnace arch, an end header located on the top side of the movable furnace arch, and water-cooling pipes connected between the pivot header and the end header, wherein the left and right end surfaces of the movable furnace arch are respectively provided with a plurality of side end water-cooling pipes, and the side end water-cooling pipes on each side are welded to each other with inter-tube steel plates, thereby forming a side end membrane wall structure; The pivotal manifold is a slender pipe member that serves as the pivot of the movable furnace arch. The pivotal manifold is adapted to pass through the boiler water wall and be rotatably supported, so that the movable furnace arch can rotate around the pivotal manifold to adjust its tilt angle. A water inlet and a water outlet are respectively provided at both end portions of the pivotal manifold, so that cooling water can enter the movable furnace arch from the water inlet and flow out from the water outlet. Water cooling grilles are also provided on the side membrane wall structures on the left and right sides of the movable furnace arch. The water cooling grilles include a plurality of parallel and spaced longitudinal slats and a plurality of transverse slats welded between adjacent longitudinal slats. The longitudinal slats and transverse slats form a grid structure. The longitudinal slats and transverse slats of the water cooling grilles are respectively welded to the side water cooling tubes and the steel plates between the tubes of the side membrane wall structure within the cooling range of the side membrane wall, thereby achieving water cooling with the help of the side membrane wall structure.

2. The movable furnace arch according to claim 1, characterized in that: One or more baffles are provided in the pivot header and / or the end header to regulate the direction of the cooling water.

3. The movable furnace arch according to claim 1, characterized in that: The longitudinal strips are welded to the side water-cooling tubes along the extending direction of the side water-cooling tubes, while the transverse strips are welded to the side water-cooling tubes and the steel plates between the tubes substantially perpendicularly to the side water-cooling tubes.

4. The movable furnace arch according to claim 1, characterized in that: The end of the pivot coupling is provided with a power receiving portion so that it can receive power from outside the boiler to rotate, thereby adjusting the tilt angle.

5. A boiler, characterized in that: The boiler has a movable furnace arch as claimed in any one of the preceding claims.

6. The boiler according to claim 5, characterized in that The furnace wall of the boiler is provided with a furnace wall side water-cooling grille in the movable area of ​​the movable furnace arch. The furnace wall side water-cooling grille includes a plurality of parallel and spaced longitudinal slats and a plurality of transverse slats welded between adjacent longitudinal slats. The longitudinal slats and the transverse slats form a grid structure. The longitudinal slats and the transverse slats of the furnace wall side water-cooling grille are welded to the water-cooling pipes and the inter-tube steel plates of the furnace wall membrane wall within the cooling range of the furnace wall membrane wall, thereby achieving water cooling with the help of the furnace wall membrane wall.

7. The boiler according to claim 6, characterized in that The water-cooling grille of the movable furnace arch is arranged adjacent to the water-cooling grille on the furnace wall side.

8. The boiler according to claim 6, characterized in that The longitudinal slats of the water-cooling grille on the furnace wall side extend substantially horizontally, and the transverse slats extend substantially vertically.

9. The boiler according to claim 8, characterized in that The longitudinal slats of the water-cooling grille on the furnace wall side are welded to the water-cooling pipes and the steel plates between the pipes approximately perpendicularly to the water-cooling pipes of the furnace wall membrane wall, and the transverse slats of the water-cooling grille on the furnace wall side are welded to the steel plates between the pipes along the extension direction of the water-cooling pipes of the furnace wall membrane wall.

10. The boiler according to claim 5, characterized in that A refractory sealing filler is provided between the pivot header of the movable furnace arch and the corresponding boiler water-cooled wall.

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