阅读说明：本技术 一种燃机余热锅炉穿护板管道的密封结构 (Sealing structure of protective plate penetrating pipeline of gas turbine waste heat boiler ) 是由 陆益顺 陆彬 毕延双 王新雨 于 2021-06-29 设计创作，主要内容包括：本发明涉及锅炉穿护板管道技术领域,具体为一种燃机余热锅炉穿护板管道的密封结构,其能够保证穿护板处的可靠密封且吸收管道热膨胀,提高使用寿命,其包括穿过护板的管道,其特征在于,所述管道外部套装穿过所述护板的内螺纹管且所述管道外壁与所述内螺纹管内壁之间填充有陶瓷纤维布,所述内螺纹管的外壁上安装有间隔布置的活动密封圆环板,所述护板上安装有圆筒,所述圆筒内壁安装有间隔布置的固定密封圆环板,所述活动密封圆环板与所述固定密封圆环板呈交错插入布置。(The invention relates to the technical field of boiler protection plate penetrating pipelines, in particular to a sealing structure of a gas turbine waste heat boiler protection plate penetrating pipeline, which can ensure reliable sealing at the protection plate penetrating position and absorb thermal expansion of the pipeline and prolong the service life.)

1. A sealing structure of a gas turbine waste heat boiler protective plate penetrating pipeline comprises a pipeline penetrating through a protective plate, and is characterized in that an internal thread pipe penetrating through the protective plate is sleeved outside the pipeline, ceramic fiber cloth is filled between the outer wall of the pipeline and the inner wall of the internal thread pipe, movable sealing ring plates arranged at intervals are installed on the outer wall of the internal thread pipe, a cylinder is installed on the protective plate, fixed sealing ring plates arranged at intervals are installed on the inner wall of the cylinder, and the movable sealing ring plates and the fixed sealing ring plates are arranged in a staggered insertion mode; the pipeline is horizontally arranged and penetrates through the vertically arranged guard plate, and the distance from the peripheral surface of the lower end of the movable sealing circular ring plate to the cylinder and the distance from the fixed sealing circular ring plate at the lower end to the outer wall of the internal thread pipe are both greater than the downward expansion amount of the whole pipeline; the pipe clamp is fixed at the end part of the pipeline and connected with the movable sealing circular ring plate at the outermost side through a tension spring.

2. The sealing structure of the combustion engine waste heat boiler backplate pipeline according to claim 1, wherein the movable sealing ring plate and the fixed sealing ring plate are both welded.

Technical Field

The invention relates to the technical field of boiler protection plate penetrating pipelines, in particular to a sealing structure of a protection plate penetrating pipeline of a gas turbine waste heat boiler.

Background

The boiler is an energy conversion device, and the energy source continuously heats the working medium to certain parameters by using the chemical energy or other heat energy of the fuel. According to the using scene, the boiler can be divided into a power station boiler (power generation), an industrial boiler (steam for industrial production or heating), and a hot water boiler (civil heating or heating). The fuel or energy sources can be classified into solid fuel boilers, liquid fuel boilers, gas fuel boilers, waste heat boilers, nuclear energy boilers, and the like. The waste heat boiler is a boiler which heats water to a certain temperature by using waste heat in waste gas, waste materials or waste liquid in various industrial processes and heat generated after combustible substances are combusted. The gas turbine waste heat boiler is one of waste heat boilers, heats working medium water to certain parameters for the steam turbine to use by heating energy in exhaust gas of the gas turbine, and forms a set of combined cycle device with the gas turbine, the steam turbine and the generator. The gas turbine waste heat boiler contains a large number of pipeline penetrating the protection plate, and the pipeline can expand by heating in the operation process, so that the displacement of the pipeline can be compensated by the sealing at the protection plate penetrating position, and the reliable sealing between the pipeline and the protection plate can be ensured. The existing gas turbine waste heat boiler generally uses a nonmetal expansion joint, and the condition of flue gas leakage caused by the failure of the nonmetal expansion joint often occurs due to high flue gas temperature and large pipeline displacement. The concrete expression is as follows: (1) the insulating layer of nonmetal expansion joint can't closely block the flue gas, and the flue gas leaks outward and leads to outside covering super temperature damage, and then makes the flue gas flow from damaged department. (2) The pipeline with large expansion amount is easy to crack the outer skin, and the whole sealing performance of the nonmetal expansion joint can be damaged after cracks are generated. (3) The nonmetal expansion joint has a certain service life under the condition of reasonable design, generally has failure problems after being used for several years, and becomes a consumable product which needs to be replaced frequently.

Disclosure of Invention

In order to solve the problems that the sealing structure at the existing shield penetrating position is easy to lose efficacy and cannot compensate for thermal expansion of a pipeline, and the service life is short, the invention provides the sealing structure of the shield penetrating pipe of the gas turbine waste heat boiler, which can ensure reliable sealing at the shield penetrating position, absorb the thermal expansion of the pipeline and prolong the service life.

The technical scheme is as follows: the utility model provides a gas turbine exhaust-heat boiler wears seal structure of backplate pipeline, its is including the pipeline that passes the backplate, its characterized in that, the outside suit of pipeline passes the internal thread pipe of backplate just the pipeline outer wall with it has ceramic fiber cloth to fill between the internal thread pipe inner wall, install interval arrangement's movable sealing ring board on the outer wall of internal thread pipe, install the drum on the backplate, interval arrangement's fixed sealing ring board is installed to the drum inner wall, movable sealing ring board with fixed sealing ring board is crisscross the inserting and arranges.

The pipeline is further characterized in that the pipeline is horizontally arranged and penetrates through a vertically arranged guard plate, and the distance from the peripheral surface of the lower end of the movable sealing circular ring plate to the cylinder and the distance from the fixed sealing circular ring plate at the lower end to the outer wall of the internal thread pipe are both greater than the downward expansion amount of the whole pipeline;

the movable sealing circular ring plate and the fixed sealing circular ring plate are arranged in a welding mode;

the pipe clamp is fixed at the end part of the pipeline and connected with the movable sealing circular ring plate at the outermost side through a tension spring.

After the invention is adopted, because the internal thread pipe is tightly connected with the pipeline through the ceramic fiber cloth, when the pipeline is heated and expanded, the movable sealing circular ring plate is driven to move outwards and is tightly propped against the fixed sealing circular ring plate, the tight sealing of smoke is realized, the thermal expansion of the pipeline can be absorbed, the structure is simple and reliable, and the service life is prolonged.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic half-section view of the present invention.

Detailed Description

See fig. 1, fig. 2, fig. 3 shows, a sealing structure of gas turbine exhaust-heat boiler backplate pipeline is worn, it is including the pipeline 1 that passes backplate 2, pipeline 1 level is arranged, backplate 2 sets up in the left side and pipeline 1 left end passes backplate 2 promptly, it has ceramic fiber cloth 3 to pack between 1 outer wall of the internal thread pipe 4 and pipeline 1 outer wall and the internal thread pipe 4 inner wall of pipeline 1 outside suit that passes backplate 2, install interval arrangement's movable seal ring plate 6 on the outer wall of internal thread pipe 4, drum 10 is installed on 2 right sides of backplate, interval arrangement's fixed seal ring plate 5 is installed to drum 10 inner wall, movable seal ring plate 6 and fixed seal ring plate 5 are the crisscross interpolation and arrange, and the rightmost side is fixed seal ring plate 5. The movable sealing circular ring plate 6 and the fixed sealing circular ring plate 5 are arranged in a welding mode.

The distance from the peripheral surface of the lower end of the movable sealing circular ring plate 6 to the cylinder 10 and the distance from the fixed sealing circular ring plate 5 at the lower end to the outer wall of the internally threaded pipe 4 are both larger than the downward expansion amount of the whole pipeline 1.

When the boiler works, the pipeline 1 moves to the right side and the lower side after being heated and expanded, the pipeline 1 drives the internal threaded pipe 4 and the movable sealing circular plate 6 installed on the outer side of the internal threaded pipe to move downwards together, the depth of the movable sealing circular plate 6 inserted into the fixed sealing circular plate 5 downwards becomes deep, and the depth of the upper movable sealing circular plate 6 inserted into the fixed sealing circular plate 5 becomes shallow. In this process, the internally threaded tube 4 and the movable sealing ring plate 6 mounted on the outside thereof are kept stationary in the left-right direction and can move only downward, being restricted by the fixed sealing ring plate 5 mounted on the inside of the cylinder 10. The pipeline 1 can stretch out to the right side relative to the internal thread pipe 4, and the ceramic fiber cloth 3 can be blocked to the screw thread of the internal thread pipe 4 inboard, makes it fixed in the left and right direction, and relative position and internal thread pipe 4 keep unanimous, and the flue gas on the left side of the backplate is sealed by the ceramic fiber cloth 3 of filling between internal thread pipe 4 and pipeline 4 simultaneously and can't escape.

The pipe clamp 9 is fixed at the right end of the pipeline 1, the pipe clamp 9 is directly clamped on the pipeline 1, the pipe clamp 9 is connected with the movable sealing circular ring plate 6 at the outermost side through the extension spring 7, the extension spring 7 is coaxially sleeved outside the pipeline 1, the pipe clamp 9 is further fixed with a spring connecting plate 8 used for connecting the extension spring 7, and an extension structure is integrally formed. When the boiler works, the pipeline 1 is heated and expanded and then drives the pipe clamp 9 and the spring connecting plate 8 to move towards the right side and the lower side, the spring connecting plate 8 pulls the extension spring 7 towards the right side, the extension spring 7 generates a pulling force towards the right side for the movable sealing circular plate 6, and the movable sealing circular plate 6 is driven to tightly seal the smoke on the left side of the protection plate 2 in a staggered mode on the fixed sealing circular plate 5 layer by layer, so that the sealing performance is further guaranteed, and the expansion amount can be absorbed.