Tail cylinder sealing piece

Abstract

The invention discloses a tail cylinder sealing piece. The tail cylinder sealing piece comprises an inner ring and an outer ring; the inner ring includes an inner ring body, a first brush module and a first welding plate; the first brush module includes a first fixed plate, a second fixed plate and a first brush sealing wire; the outer ring includes an outer ring body, a second brush module and a second welding plate; the second brush module includes a third fixed plate, a fourth fixed plate and a second brush sealing wire; the inner ring and the outer ring are forgings; and the inner ring body, the outer ring body, the first fixed plate, the second fixed plate, the third fixed plate, the fourth fixed plate, the first welding plate and the second welding plate adopt materials of nickel-chromium-molybdenum alloys of cobalt and tungsten. The tail cylinder sealing piece adopts a forging machine manufacturing technology, guarantees the product size consistency and assembly precision, enhances the product structural strength, increases the wire arranging density, effectively seals high-temperature gas at an outlet part of a gas turbine tail cylinder, and adopts a chamfering angle of an exhaust hole as an obtuse angle to prevent cracking of the exhaust hole.

Description

technical field [0001] The invention relates to a tailpiece seal for a gas engine, in particular to a tailpiece seal for a 9F gas turbine. Background technique [0002] Our company is the first batch of 390MW class M701F3 gas-steam combined cycle generator sets introduced in China. It has been 9 years since it was put into operation. The burner is the most important part of the gas turbine. at temperatures as high as 1400°C. Before the high-temperature gas passes through the tailpiece and enters the turbine vane, a special sealing structure is required to prevent the high-temperature gas from leaking. As an important component for sealing the transition piece and the first-stage turbine vane, the transition piece seal has a serious impact on the efficiency and safe operation of the unit due to its structural reliability and sealing performance. [0003] The tailpiece brush air seal is composed of high temperature resistant body material and brush, which forms a contact sea...

AI Technical Summary

Problems solved by technology

[0004] However, the brush gas seals for gas turbines are vulnerable parts. After each minor repair operation cycle, serious damage or deformation will occur. Basically, new tailpiece seals need to be purchased again, and the cost is extremely high.

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