Smoke window structure on rear wall of channel of coal-fired boiler

Abstract

The utility model provides a coal-fired boiler channel rear wall smoke window structure which comprises a membrane type water cooling wall, the membrane type water cooling wall comprises a water distributing pipe and a water collecting pipe, cooling water pipes which are arranged at equal intervals are connected between the water distributing pipe and the water collecting pipe, and a smoke window is cut in the middle of the membrane type water cooling wall. And the cooling water pipe part on the membrane water-cooled wall at the position of the flue gas window is connected through a window pipe connecting assembly. According to the utility model, the cooling water pipes are cut off from the membrane water-cooled wall according to odd or even rows on site, then the window pipe connecting assembly is arranged, and the two ends are welded, so that the structure is simple, only one elbow structure is adopted, space geometry limitation factors caused by the adoption of a multi-elbow structure on the outer side are avoided, and the production cost is reduced. Therefore, almost no invalid area is generated.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-fired boiler equipment, in particular to a chimney structure on the rear wall of a coal-fired boiler passage. Background Art

[0002] The membrane water wall is an important component of a boiler unit. Its main function is to absorb the radiant heat of high-temperature flames and flue gases in the furnace and reduce the temperature of the furnace wall. Existing coal-fired boilers basically adopt two structures of arranging dense horizontal water pipes on the furnace wall. The traditional form of opening a flue gas window on the membrane water wall is to open it in a "V-shaped" manner towards a single side. When this method is applied to large-area flue gas windows, a large variety of bent pipes are required, and due to space geometry limitations, a lot of ineffective area will be generated during the arrangement of the bent pipes, which is not economical and reasonable. Content of the Utility Model

[0003] In order to solve the above problems, the utility model proposes a chimney structure on the rear wall of a coal-fired boiler passage to more precisely solve the above-mentioned problems.

[0004] The utility model is realized through the following technical solutions:

[0005] The utility model proposes a chimney structure on the rear wall of a coal-fired boiler passage, including a membrane water wall. The membrane water wall includes a water distribution pipe and a water collection pipe, and cooling water pipes are arranged at equal intervals between the water distribution pipe and the water collection pipe. Each cooling water pipe in the membrane water wall is connected by a wall connecting plate to form an integral wall plate. A flue gas window is cut in the middle of the membrane water wall. The cooling water pipe part at the position of the flue gas window on the membrane water wall is connected by a window pipe connection component. The window pipe connection component includes a first pipe fitting and a second pipe fitting. The first pipe fitting is a branch pipe body, and the second pipe fitting is a bent pipe body bent in a "C" shape. The cooling water pipe orifices corresponding to the upper and lower positions of the flue gas window are connected by the first pipe fitting and the second pipe fitting.

[0006] Furthermore, the first pipe fitting and the second pipe fitting are arranged in an alternating manner, and the pipe shape of the second pipe fitting on one side of the first pipe fitting bends inward, and the pipe shape of the second pipe fitting on the other side of the first pipe fitting bends outward.

[0007] Furthermore, pipe fittings plugs are integrally formed at the upper and lower ends of the first pipe fitting and the second pipe fitting. Assembly notch openings matching the size of the pipe fittings plugs are opened at the cooling water pipe orifices at the position of the flue gas window, and the pipe fittings plugs provided at the upper and lower ends of the first pipe fitting and the second pipe fitting are inserted into the assembly notch openings opened at the cooling water pipe ports. A conical pipe neckdown is integrally formed at the port part of the pipe fittings plugs.

[0008] Furthermore, a welding annular groove is left between the upper and lower ports of the first pipe fitting and the second pipe fitting and the connecting end of the cooling water pipe, and the groove depth of the welding annular groove is one third of the thickness of the first pipe fitting.

[0009] Furthermore, the groove cross section of the welding ring groove is trapezoidal, and the groove width of the welding ring groove is larger than the groove bottom width.

[0010] Furthermore, the outer wall of the end of the second pipe and the outer wall of the cooling water pipe provided at the upper and lower ends of the smoke window are provided with marking pointers, and the marking pointer provided at the end of the second pipe corresponds to the marking pointer provided at the interface of the cooling water pipe.

[0011] Beneficial effects of the utility model:

[0012] 1. The utility model only needs to cut off the cooling water pipes on the membrane water-cooled wall according to the odd or even rows, and then replace the window pipe connection assembly and weld the two ends. The structure is simple and only one elbow structure is adopted, which avoids the spatial geometric restriction factor caused by the multi-elbow structure on the outside, so there is almost no invalid area.

[0013] 2. The upper and lower ends of the first pipe fitting and the second pipe fitting are integrally formed with pipe fitting plugs, and the pipe fitting plugs provided at the upper and lower ends of the first pipe fitting and the second pipe fitting are inserted into the assembly grooves provided at the ports of the cooling water pipes, so as to facilitate the insertion and alignment of the first pipe fitting and the second pipe fitting with the cooling water pipes during the assembly process, and welding ring grooves are left between the upper and lower ports of the first pipe fitting and the second pipe fitting and the connecting ends of the cooling water pipes, so as to facilitate welding and ensure the sealing of the welding connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the three-dimensional structure disassembly of the utility model;

[0016] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0017] Figure 4 It is a side view of the structure of the utility model;

[0018] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0019] In the figure: 1. membrane water wall; 101. water distribution pipe; 102. water collecting pipe; 103. cooling water pipe; 1031. assembly notch; 104. wall connecting plate; 105. flue gas window; 2. window pipe connection assembly; 201. first pipe fitting; 202. second pipe fitting; 203. pipe fitting plug; 2031. conical pipe necking; 2032. welding ring groove; 204. identification pointer. Detailed implementation mode

[0020] In order to more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0021] Please refer to Figure 1-Figure 5 , the present invention provides a structure of a flue gas window on the rear wall of a coal-fired boiler passage, including a membrane water wall 1, the membrane water wall 1 includes a water distribution pipe 101 and a water collecting pipe 102, and cooling water pipes 103 arranged at equal intervals are connected between the water distribution pipe 101 and the water collecting pipe 102. Each cooling water pipe 103 in the membrane water wall 1 is connected by a wall connecting plate 104 to form an integral wall plate. A flue gas window 105 is cut in the middle of the membrane water wall 1. The part of the cooling water pipe 103 at the position of the flue gas window 105 on the membrane water wall 1 is connected by a window pipe connection assembly 2. The window pipe connection assembly 2 includes a first pipe fitting 201 and a second pipe fitting 202. The first pipe fitting 201 is a branch pipe body, and the second pipe fitting 202 is a bent pipe body bent in a "C" shape. The pipe orifices of the cooling water pipes 103 corresponding to the upper and lower positions of the flue gas window 105 are connected by the first pipe fitting 201 and the second pipe fitting 202. The first pipe fitting 201 and the second pipe fitting 202 are arranged in a staggered manner, and the pipe shape of the second pipe fitting 202 on one side of the first pipe fitting 201 bends inward, and the pipe shape of the second pipe fitting 202 on the other side of the first pipe fitting 201 bends outward. On-site, only the cooling water pipes 103 need to be cut off on the membrane water wall 1 according to odd rows or even rows, and then the window pipe connection assembly 2 is replaced and the two ends are welded. The structure is simple. Only one type of bent pipe structure form is adopted, which avoids the spatial geometric limitation factors caused by the multi-bent pipe structure form on the outside, so almost no ineffective area is generated.

[0022] Combined with Figure 2 , Figure 4 and Figure 5As shown, the upper and lower ends of the first pipe fitting 201 and the second pipe fitting 202 are integrally formed with pipe fitting plugs 203, and an assembly groove 1031 matching the size of the pipe fitting plug 203 is provided at the pipe mouth of the cooling water pipe 103 at the position of the smoke window 105, and the pipe fitting plugs 203 provided at the upper and lower ends of the first pipe fitting 201 and the second pipe fitting 202 are inserted into the assembly groove 1031 provided at the port of the cooling water pipe 103, and the port portion of the pipe fitting plug 203 is integrally formed with a conical pipe shrinkage 2031, which facilitates the insertion and alignment of the first pipe fitting 201, the second pipe fitting 202 and the cooling water pipe 103 during the assembly process of the window pipe connecting assembly 2.

[0023] like Figure 3 As shown, the outer wall of the end of the second pipe fitting 202 and the outer wall of the cooling water pipe 103 arranged at the upper and lower ends of the smoke window 105 are provided with an identification pointer 204, and the identification pointer 204 arranged at the end of the second pipe fitting 202 is arranged corresponding to the identification pointer 204 arranged at the interface of the cooling water pipe 103. During the assembly process of the window tube connecting assembly 2, the bending direction of the bending part of the second pipe fitting 202 can be aligned to facilitate correction and positioning.

[0024] A welding annular groove 2032 is left between the upper and lower ports of the first pipe fitting 201 and the second pipe fitting 202 and the connecting end of the cooling water pipe 103, and the groove depth of the welding annular groove 2032 is one third of the thickness of the first pipe fitting 201. The groove cross-section of the welding annular groove 2032 is trapezoidal, and the groove width of the welding annular groove 2032 is larger than the groove bottom width, which is convenient for welding and ensures the sealing of the welding connection.

[0025] Of course, the present utility model may have many other implementations. Based on the present implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present utility model.

Claims

1. A smoke window structure of a coal-fired boiler channel rear wall, comprising a membrane water-cooled wall (1), characterized in that: The membrane water wall (1) includes a water distribution pipe (101) and a water collection pipe (102), and cooling water pipes (103) arranged at equal intervals are connected between the water distribution pipe (101) and the water collection pipe (102). Each cooling water pipe (103) in the membrane water wall (1) is connected by a wall connecting plate (104) to form an integral wall panel. A flue gas window (105) is cut in the middle of the membrane water wall (1). The part of the cooling water pipe (103) at the position of the flue gas window (105) on the membrane water wall (1) is connected by a window pipe connection assembly (2). The window pipe connection assembly (2) includes a first pipe fitting (201) and a second pipe fitting (202). The first pipe fitting (201) is a branch pipe body, and the second pipe fitting (202) is a bent pipe body bent in a "C" shape. The pipe orifices of the cooling water pipes (103) corresponding to the upper and lower positions of the flue gas window (105) are connected by the first pipe fitting (201) and the second pipe fitting (202).

2. A coal-fired boiler channel rear wall smoke window structure according to claim 1, characterized in that: The first pipe fitting (201) and the second pipe fitting (202) are arranged in an alternating manner, and the pipe shape of the second pipe fitting (202) on one side of the first pipe fitting (201) is bent inward, and the pipe shape of the second pipe fitting (202) on the other side of the first pipe fitting (201) is bent outward.

3. The smoke window structure of the rear wall of the coal-fired boiler passage according to claim 1 is characterized in that: Pipe fittings plugs (203) are integrally formed at the upper and lower ends of the first pipe fitting (201) and the second pipe fitting (202). Assembly notch openings (1031) matching the dimensions of the pipe fittings plugs (203) are provided at the pipe orifices of the cooling water pipes (103) at the position of the flue gas window (105). The pipe fittings plugs (203) provided at the upper and lower ends of the first pipe fitting (201) and the second pipe fitting (202) are inserted into the assembly notch openings (1031) provided at the ports of the cooling water pipes (103). A conical pipe necking (2031) is integrally formed at the port part of the pipe fittings plug (203).

4. A coal-fired boiler channel rear wall smoke window structure according to claim 1, characterized in that: A welding ring groove (2032) is left between the upper and lower ports of the first pipe fitting (201) and the second pipe fitting (202) and the connection end with the cooling water pipe (103), and the groove depth of the welding ring groove (2032) is one-third of the pipe thickness of the first pipe fitting (201).

5. A coal-fired boiler channel rear wall smoke window structure according to claim 4, characterized in that: The cross-section of the groove shape of the welding ring groove (2032) is trapezoidal, and the width of the groove opening of the welding ring groove (2032) is larger than the width dimension of the groove bottom.

6. A coal-fired boiler channel rear wall smoke window structure according to claim 4, characterized in that: Marking pointers (204) are provided on the outer wall of the end of the second pipe fitting (202) and the outer walls of the cooling water pipes (103) provided at the upper and lower ends of the flue gas window (105), and the marking pointer (204) provided at the end of the second pipe fitting (202) is arranged corresponding to the marking pointer (204) provided at the interface of the cooling water pipe (103).

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