Chimney expansion joint

Abstract

The invention discloses a chimney expansion joint. The technical scheme is that the chimney expansion joint comprises a steel inner cylinder, a flange rack part and a seal ring, wherein the seal ring is fixedly connected with the steel inner cylinder through the flange rack part; the flange rack part comprises an upper taper angle flange, a lower taper angle flange, an upper pressing flange, a lower pressing flange and a bolt component; inner rings of the upper taper angle flange and the lower taper angle flange are welded with the steel inner cylinder; mounting surfaces at the two ends of the seal ring are fixedly pressed between the upper taper angle flange and the lower taper angle flange through the upper pressing flange and the lower pressing flange; the mounting surfaces at the two ends of the seal ring are positioned between corresponding upper and lower taper angle flanges and upper and lower pressing flanges respectively; the upper and lower taper angle flanges and the upper and lower pressing flanges tilt upwards at an angle of 9-16 degrees; and anti-corrosion parts are arranged on corresponding welding parts of the upper and lower taper angle flanges and the inner side of the steel inner cylinder. By using the scheme, the manufacturing cost can be reduced, the construction period can be shortened, the maintenance is convenient, and the service life is prolonged.

Description

technical field [0001] The invention relates to a chimney expansion joint. Background technique [0002] With the promotion of energy saving and emission reduction in my country, wet desulfurization has become the main process of flue gas treatment in power plants in my country. The flue gas after desulfurization has high humidity and strong corrosion. As a pipe for independently transporting flue gas, the smoke exhaust steel inner cylinder is also gradually popularized and used in new power plants. At present, there are mainly two types of smoke exhaust steel inner tubes: self-supporting type and hanging type. Among them, the hanging type is gradually popularized in new thermal power plants due to its advantages of less overall steel consumption, light weight, and low installation cost. The deformation and displacement caused by thermal expansion and contraction of the cylinder itself need expansion joints to absorb, and the matching expansion joints have become important ...

AI Technical Summary

Problems solved by technology

[0005] 2. There are some inconveniences in the installation, use and maintenance of the above three steel inner cylinder expansion joints used earlier, and the use effect is not good, and the design requirements cannot be met:

[0006] (1) Sleeve-type expansion joint: The structure of this product is difficult to construct, the internal expansion joint is damaged and cannot be replaced directly, and the external reinforcement ring must be removed

At the same time, the seal at the top cannot implement effective dynamic sealing. This case is a power plant in Suizhong, Liaoning

[0007] (2) C-type titanium plate expansion joint: The structure of this product is C-type structure. Although titanium plate is relatively corrosion-resistant and widely used in chimneys, it has poor ductility and high brittleness, so it can only be formed in sections. Segment welding, segment assembly

This structure has the following problems in actual use: a) there is a gap at the bottom of the flange, which may easily cause acid to leak downward b) when fluorine rubber forms a ring seal, it is sealed with sealant, and the thickness of this part increases, and the sealant solidifies When the pipe is deformed, the part bends and produces arc tearing, which becomes a hidden danger of leakage.

[0009] Due to the fact that there are many forms of hanging steel inner cylinders that were put into production in the early stage in China, and the actual use conditions are not ideal, the power plant will change from the original hanging chimney to a self-supporting chimney during the later expansion or the second phase of construction, and the cost will rise by about 35%, based on 300,000 to 1 million units, the increased cost is about 5 million to 10 million yuan

Images