CN-115435175-B - A prevent stifled grey structure for coal fired boiler flue nonmetal expansion joint

Abstract

The invention provides an ash blocking preventing structure for a nonmetal expansion joint of a flue of a coal-fired boiler, and belongs to the technical field of ash treatment of expansion joints of the flue of the coal-fired boiler. In the invention, 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 respectively connected with the first expansion joint guide plate and the second expansion joint guide plate, the flexible ash blocking structure is a bending structure and consists of a stainless steel wire mesh and high-temperature-resistant ceramic fiber cotton, and the high-temperature-resistant ceramic fiber cotton is filled between the two layers of stainless steel wire meshes. The invention can avoid damage of the nonmetal expansion joint of the flue of the coal-fired boiler caused by ash deposition, and effectively prolong the service life of the nonmetal expansion joint of the flue.

Inventors

• WANG MENG
• LV JIAN

Assignees

• 哈尔滨锅炉厂有限责任公司

Dates

Publication Date

20260508

Application Date

20220915

Claims (5)

1. 1. The ash blocking prevention structure for the nonmetal expansion joint of the flue of the coal-fired boiler is characterized by comprising 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 heat preservation structure (5), an expansion joint skin (6) and a flexible ash blocking structure (7); The novel expansion joint structure comprises a first expansion joint frame (1), a first expansion joint guide plate (2) arranged on one side of the first expansion joint frame (1), a second expansion joint guide plate (3) arranged on one side of the second expansion joint frame (4), guide plate gaps between the first expansion joint guide plate (2) and the second expansion joint guide plate (3), a flexible ash blocking structure (7) respectively connected with the first expansion joint guide plate (2) and the second expansion joint guide plate (3), a bending structure for the flexible ash blocking structure (7), expansion joint covers (6) connected with the bottom ends of the first expansion joint guide plate (2) and the second expansion joint guide plate (3) through bolts, an expansion joint heat preservation structure (5) arranged above the expansion joint covers (6), the flexible ash blocking structure (7) is composed of a stainless steel wire mesh (7-1) and high-temperature-resistant ceramic fiber cotton (7-2), and the middle of the two layers of stainless steel wire mesh (7-1) is filled with the high-temperature-resistant ceramic fiber cotton (7-2), and the flexible ash blocking structure (7) is connected with the first expansion joint covers (2) and the second expansion joint covers (3) through bolts.
2. 2. The ash blocking prevention structure for the nonmetal expansion joint of the flue of the coal-fired boiler according to claim 1, wherein a plurality of flexible ash blocking structures (7) are arranged between the first expansion joint guide plate (2) and the second expansion joint guide plate (3).
3. 3. The ash blocking prevention structure for a nonmetal expansion joint of a flue of a coal-fired boiler according to claim 2, wherein the number of the flexible ash blocking structures (7) is determined according to the length dimension of a first expansion joint guide plate (2) and a second expansion joint guide plate (3) and the size of a gap between the first expansion joint guide plate (2) and the second expansion joint guide plate (3).
4. 4. The ash blocking preventing structure for a nonmetal expansion joint of a flue of a coal-fired boiler according to claim 1, wherein the length of the stainless steel wire mesh (7-1) is calculated and determined according to 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 thermal displacement amount absorbed by the expansion joint.
5. 5. The ash blocking prevention structure for a nonmetal expansion joint of a flue of a coal-fired boiler according to claim 1, wherein the high-temperature resistant ceramic fiber cotton (7-2) is compacted by a stainless steel wire mesh (7-1) and reinforced by thin iron wires.

Description

A prevent stifled grey structure for coal fired boiler flue nonmetal expansion joint Technical Field The invention relates to an ash blocking preventing structure for a nonmetal expansion joint of a flue of a coal-fired boiler, and belongs to the technical field of ash treatment of expansion joints of the flue of the coal-fired boiler. Background The non-metal expansion joint mainly aims at absorbing the displacement of the thermal expansion joint between two sections of flues, but in the flue of the coal-fired boiler, the fly ash is contained in the flue gas and can be deposited at the bottoms of the flues and the non-metal expansion joint, a certain gap exists between the fly ash and the flow guide plate in the non-metal expansion joint, the fly ash can enter the flow guide plate gap of the non-metal expansion joint after being deposited, the ash quantity is accumulated for a long time, the skin is overloaded, the flow guide plate is blocked, the function of absorbing the thermal displacement of the non-metal expansion joint is weakened, and even the service life of parts of the non-metal expansion joint is reduced and damaged. This is more serious in non-metallic expansion joints arranged obliquely in the flue of coal-fired boilers. Disclosure of Invention The invention aims to solve the problems in the prior art and further provides an ash blocking preventing structure for a nonmetal expansion joint of a flue of a coal-fired boiler. The invention aims at realizing the following technical scheme: An ash blocking preventing structure for a nonmetal expansion joint of a flue of a coal-fired boiler comprises a first expansion joint frame, a first expansion joint guide plate, a second expansion joint frame, an expansion joint heat insulation structure, an expansion joint skin and a flexible ash blocking structure; The flexible ash blocking structure is a bending structure, the bottoms of the first expansion joint guide plate and the second expansion joint guide plate are respectively connected with an expansion joint skin through bolts, an expansion joint heat preservation structure is arranged above the expansion joint skin, the flexible ash blocking structure is composed of a stainless steel wire net and high-temperature-resistant ceramic fiber cotton, and the middle of the two layers of stainless steel wire nets is filled with the high-temperature-resistant ceramic fiber cotton. Further, a plurality of flexible ash blocking structures are arranged between the first expansion joint guide plate and the second expansion joint guide plate. Further, the number of the flexible ash blocking structures is determined according to the length sizes of the first expansion joint guide plate and the second expansion joint guide plate and the size of a gap between the first expansion joint guide plate and the second expansion joint guide plate. Further, the flexible ash blocking structure is connected with the first expansion joint guide plate and the second expansion joint guide plate by spot welding. Further, the length of the stainless steel wire mesh is calculated and determined according to 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 thermal displacement absorbed by the expansion joints. Further, the high-temperature-resistant ceramic fiber cotton is compacted through a stainless steel wire mesh and reinforced by adopting a thin iron wire. The beneficial effects of the invention are as follows: The invention provides the ash blocking preventing structure of the nonmetal expansion joint of the coal-fired boiler flue, which is arranged at the bottom of the nonmetal expansion joint of the coal-fired boiler flue, is capable of preventing the accumulated ash from entering the guide plate, and does not influence the use function of the nonmetal expansion joint, so that the nonmetal expansion joint of the coal-fired boiler flue is prevented from being damaged due to the accumulated ash. The structure of the invention can be used for nonmetal expansion joints of flues of coal-fired boilers with large ash content, especially expansion joints of inclined flues, can avoid damage of nonmetal expansion joints caused by ash accumulation, and effectively prolongs the service life of nonmetal expansion joints of flues. The structure of the invention is a flexible sealing structure which is added between the guide plates of the nonmetal expansion joint, and the structures adopted by the prior art and the patent are all metal structures. The flexible sealing structure is arranged in the gap of the nonmetal guide plate, and seals the gap of the guide plate on the premise of not affecting the service performance of the nonmetal expansion joint. The prior art and the patent are usually arranged outside the guide plate and are used as a second guide plate, so that a guide