A dust blocking prevention structure for a non-metal expansion joint of a coal-fired boiler flue

Abstract

The application provides an anti-ash blocking structure for a non-metal expansion joint of a coal-fired boiler flue, and belongs to the technical field of ash treatment of the coal-fired boiler flue expansion joint. In the application, a guide plate gap exists between a first expansion joint guide plate and a second expansion joint guide plate, a flexible ash blocking structure is connected to the first expansion joint guide plate and the second expansion joint guide plate respectively, the flexible ash blocking structure is a bending structure, the flexible ash blocking structure is composed of stainless steel wire meshes and high-temperature-resistant ceramic fiber cotton, and the high-temperature-resistant ceramic fiber cotton is filled in the middle of the two layers of stainless steel wire meshes. The application can avoid damage of the non-metal expansion joint of the coal-fired boiler flue caused by ash accumulation, and effectively prolong the service life of the non-metal expansion joint of the flue.

Description

Technical Field

[0001] This invention relates to an anti-clogging ash structure for non-metallic expansion joints in coal-fired boiler flues, belonging to the field of flue ash treatment technology for coal-fired boiler flue expansion joints. Background Technology

[0002] The primary function of non-metallic expansion joints is to absorb thermal displacement between two flue sections. However, in coal-fired boiler flues, the flue gas contains fly ash, which accumulates in the flue and at the bottom of the non-metallic expansion joints. Furthermore, the guide plates inside the non-metallic expansion joints have gaps, allowing fly ash to accumulate and enter these gaps. Over time, this ash buildup can overload the skin, cause the guide plates to jam, weaken the non-metallic expansion joint's ability to absorb thermal displacement, and even shorten the lifespan of its components, leading to damage. This situation is even more severe with non-metallic expansion joints that are arranged at an angle in coal-fired boiler flues. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and to provide an anti-ash-clogging structure for non-metallic expansion joints in coal-fired boiler flues.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] An anti-ash-blocking structure for a non-metallic expansion joint in a coal-fired boiler flue includes: a first expansion joint frame, a first expansion joint guide plate, a second expansion joint guide plate, a second expansion joint frame, an expansion joint insulation structure, an expansion joint skin, and a flexible ash-blocking structure.

[0006] The first expansion joint frame has a first expansion joint guide plate on one side, and the second expansion joint frame has a second expansion joint guide plate on one side. There is a guide plate gap between the first expansion joint guide plate and the second expansion joint guide plate. A flexible ash-blocking structure connects the first expansion joint guide plate and the second expansion joint guide plate respectively. The flexible ash-blocking structure is a curved structure. The bottom ends of the first expansion joint guide plate and the second expansion joint guide plate are respectively connected to the expansion joint skin by bolts. An expansion joint insulation structure is provided above the expansion joint skin. The flexible ash-blocking structure is composed of stainless steel wire mesh and high-temperature resistant ceramic fiber cotton. The space between the two layers of stainless steel wire mesh is filled with high-temperature resistant ceramic fiber cotton.

[0007] Furthermore, a number of flexible ash-blocking structures are provided between the first expansion joint guide plate and the second expansion joint guide plate.

[0008] Furthermore, the number of channels in the flexible ash-blocking structure is determined based on the length dimensions of the first expansion joint guide plate and the second expansion joint guide plate, as well as the size of the gap between the first expansion joint guide plate and the second expansion joint guide plate.

[0009] Furthermore, the flexible ash-blocking structure is spot-welded to the first expansion joint guide plate and the second expansion joint guide plate.

[0010] Furthermore, the length of the stainless steel wire mesh is calculated and determined based on the gap between the first expansion joint guide plate and the second expansion joint guide plate, the length dimensions of the first expansion joint guide plate and the second expansion joint guide plate, and the amount of thermal displacement absorbed by the expansion joint.

[0011] Furthermore, the high-temperature resistant ceramic fiber cotton is compacted with stainless steel wire mesh and reinforced with fine iron wire.

[0012] The beneficial effects of this invention are as follows:

[0013] This invention provides an anti-ash-clogging structure for the non-metallic expansion joint in a coal-fired boiler flue, located at the bottom where ash easily accumulates. This structure prevents ash from entering the guide plate without affecting the function of the non-metallic expansion joint, thus avoiding damage to the non-metallic expansion joint caused by ash accumulation.

[0014] The structure of this invention can be used on non-metallic expansion joints in the flue of coal-fired boilers with large ash content, especially on expansion joints in inclined flues. It can avoid damage to non-metallic expansion joints caused by ash accumulation and effectively increase the service life of non-metallic expansion joints in flues.

[0015] The structure of this invention is a flexible sealing structure added between the guide plates of a non-metallic expansion joint, while the structures used in existing technologies and patents are all metallic structures.

[0016] This invention provides a flexible sealing structure for sealing the gaps in a non-metallic deflector plate, without affecting the performance of the non-metallic expansion joint. In contrast, existing technologies and patents typically place the deflector plate on the outside as a second deflector plate, essentially adding another deflector plate, which differs from the structure and purpose of this invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the non-metallic expansion joint structure of the coal-fired boiler flue of the present invention.

[0018] Figure 2 This is a schematic diagram of an anti-ash-clogging structure for a non-metallic expansion joint in a coal-fired boiler flue according to the present invention.

[0019] Figure 3 For the present invention Figure 2 A partially enlarged schematic diagram of part I.

[0020] In the figure, the reference numerals are as follows: 1 is the first expansion joint frame, 2 is the first expansion joint guide plate, 3 is the second expansion joint guide plate, 4 is the second expansion joint frame, 5 is the expansion joint insulation structure, 6 is the expansion joint skin, 7 is the flexible ash-blocking structure, 7-1 is the stainless steel wire mesh, and 7-2 is the high-temperature resistant ceramic fiber cotton. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings: This embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods are given, but the protection scope of the present invention is not limited to the following embodiments.

[0022] like Figures 1 to 3 As shown, the anti-ash-blocking structure for a non-metallic expansion joint in a coal-fired boiler flue involved in this embodiment includes: a first expansion joint frame 1, a first expansion joint guide plate 2, a second expansion joint guide plate 3, a second expansion joint frame 4, an expansion joint insulation structure 5, an expansion joint skin 6, and a flexible ash-blocking structure 7.

[0023] The first expansion joint frame 1 has a first expansion joint guide plate 2 on one side, and the second expansion joint frame 4 has a second expansion joint guide plate 3 on one side. There is a guide plate gap between the first expansion joint guide plate 2 and the second expansion joint guide plate 3. The flexible ash-blocking structure 7 connects the first expansion joint guide plate 2 and the second expansion joint guide plate 3 respectively. The flexible ash-blocking structure 7 is a curved structure. The bottom ends of the first expansion joint guide plate 2 and the second expansion joint guide plate 3 are respectively connected to the expansion joint skin 6 by bolts. An expansion joint heat preservation structure 5 is provided above the expansion joint skin 6. The flexible ash-blocking structure 7 is composed of stainless steel wire mesh 7-1 and high-temperature resistant ceramic fiber cotton 7-2. The middle of the two layers of stainless steel wire mesh 7-1 is filled with high-temperature resistant ceramic fiber cotton 7-2.

[0024] Several flexible ash-blocking structures 7 are provided between the first expansion joint guide plate 2 and the second expansion joint guide plate 3.

[0025] The number of channels of the flexible ash-blocking structure 7 is determined based on the length of the first expansion joint guide plate 2 and the second expansion joint guide plate 3 and the size of the gap between the first expansion joint guide plate 2 and the second expansion joint guide plate 3.

[0026] The flexible ash-blocking structure 7 is connected to the first expansion joint guide plate 2 and the second expansion joint guide plate 3 by spot welding.

[0027] The length of the stainless steel wire mesh 7-1 is calculated and determined based on the gap between the first expansion joint guide plate 2 and the second expansion joint guide plate 3, the length of the first expansion joint guide plate 2 and the second expansion joint guide plate 3, and the amount of heat displacement absorbed by the expansion joint.

[0028] The high-temperature resistant ceramic fiber cotton 7-2 is compacted by stainless steel wire mesh 7-1 and reinforced with fine iron wire.

[0029] Example 1

[0030] The core structure of this invention consists of 1 to n flexible ash-blocking structures 7 arranged in the gap between the first expansion joint guide plate 2 and the second expansion joint guide plate 3. Each flexible ash-blocking structure 7 is composed of two layers of stainless steel wire mesh 7-1 sandwiching a layer of high-temperature resistant ceramic fiber cotton 7-2 (or other material insulation cotton). The stainless steel wire mesh 7-1 is spot-welded to the first expansion joint guide plate 2 and the second expansion joint guide plate 3. The high-temperature resistant ceramic fiber cotton 7-2 is compacted by the stainless steel wire mesh 7-1 and reinforced with fine iron wire. The number n of the flexible ash-blocking structures 7 depends on the length of the first expansion joint guide plate 2 and the second expansion joint guide plate 3, the size of the gap between the first expansion joint guide plate 2 and the second expansion joint guide plate 3, and the amount of heat displacement absorbed by the expansion joint.

[0031] This embodiment offers superior ash-blocking performance: Existing technologies and patented ash-blocking structures, regardless of whether they are cold or hot, always leave gaps between their structure and the non-metallic expansion joint guide plate. This cannot completely prevent ash from entering the non-metallic expansion joint, only mitigating the ash blockage. This embodiment, however, utilizes a flexible sealing structure arranged within the gaps of the non-metallic guide plate. Without affecting the performance of the non-metallic expansion joint, this seal completely prevents ash from entering the non-metallic expansion joint, avoiding damage caused by ash accumulation in the non-metallic expansion joint of the coal-fired boiler flue.

[0032] This embodiment features a superior structure, does not increase resistance, and offers better energy-saving performance: Existing anti-clogging structures with added V-shaped guide plates reduce the cross-sectional area of ​​the flue gas duct at the non-metallic expansion joint, increasing flue gas resistance. This embodiment does not change the cross-sectional area of ​​the flue gas duct at the original non-metallic expansion joint and does not increase resistance in any way.

[0033] The above description is merely a preferred embodiment of the present invention. These specific embodiments are different implementations based on the overall concept of the present invention, and the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An anti-ash-clogging structure for non-metallic expansion joints in coal-fired boiler flues, characterized in that, include: First expansion joint frame (1), first expansion joint guide plate (2), second expansion joint guide plate (3), second expansion joint frame (4), expansion joint insulation structure (5), expansion joint skin (6) and flexible ash-blocking structure (7); The first expansion joint frame (1) is provided with a first expansion joint guide plate (2) on one side, and the second expansion joint frame (4) is provided with a second expansion joint guide plate (3) on one side. There is a guide plate gap between the first expansion joint guide plate (2) and the second expansion joint guide plate (3). The flexible ash-blocking structure (7) is connected to the first expansion joint guide plate (2) and the second expansion joint guide plate (3) respectively. The flexible ash-blocking structure (7) is a curved structure. The bottom ends of the first expansion joint guide plate (2) and the second expansion joint guide plate (3) are respectively connected to the expansion joint skin (6) by bolts. An expansion joint insulation structure (5) is provided above the expansion joint skin (6). The flexible ash-blocking structure (7) is composed of stainless steel wire mesh (7-1) and high-temperature resistant ceramic fiber cotton (7-2). The middle of the two layers of stainless steel wire mesh (7-1) is filled with high-temperature resistant ceramic fiber cotton (7-2). The flexible ash-blocking structure (7) is spot-welded to the first expansion joint guide plate (2) and the second expansion joint guide plate (3).

2. The anti-ash-clogging structure for a non-metallic expansion joint in a coal-fired boiler flue according to claim 1, characterized in that, A plurality of flexible ash-blocking structures (7) are provided between the first expansion joint guide plate (2) and the second expansion joint guide plate (3).

3. The anti-ash-clogging structure for a non-metallic expansion joint in a coal-fired boiler flue according to claim 2, characterized in that, The number of channels of the flexible ash-blocking structure (7) is determined based on the length of the first expansion joint guide plate (2) and the second expansion joint guide plate (3) and the size of the gap between the first expansion joint guide plate (2) and the second expansion joint guide plate (3).

4. The anti-ash-clogging structure for a non-metallic expansion joint in a coal-fired boiler flue according to claim 1, characterized in that, The length of the stainless steel wire mesh (7-1) is calculated based on the gap between the first expansion joint guide plate (2) and the second expansion joint guide plate (3), the length dimensions of the first expansion joint guide plate (2) and the second expansion joint guide plate (3), and the amount of heat displacement absorbed by the expansion joint.

5. The anti-ash-clogging structure for a non-metallic expansion joint in a coal-fired boiler flue according to claim 1, characterized in that, The high-temperature resistant ceramic fiber cotton (7-2) is compacted by stainless steel wire mesh (7-1) and reinforced with fine iron wire.

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