Butterfly valve of intermediate-pressure cylinder of steam turbine

Abstract

The invention provides a butterfly valve of an intermediate-pressure cylinder of a steam turbine. The butterfly valve is used for adjusting the flow of steam entering a low-pressure cylinder. The butterfly valve of the intermediate-pressure cylinder of the steam turbine is arranged on an outlet of the intermediate-pressure cylinder. The butterfly valve mainly comprises a valve body, a valve clack,a rotating shaft and electric execution mechanisms, and is mainly characterized in that two small valve clacks are mounted on the sealing face of the valve clack; gaps matched with the small valve clacks are formed at the positions, corresponding to the mounting positions of the small valve clacks, on the valve clack, and a rotating clearance is reserved; the two small valve clacks are symmetrically mounted at the positions, on the two sides of the rotating shaft of the valve body, and rotating shafts of the two small valve clacks are perpendicular to the rotating shaft and are guided out from the valve body; and the small valve clacks are used for slightly adjusting the steam flow. The butterfly valve can be used for adjusting the quantity of steam entering the low-pressure cylinder, therequirement of safe operating of the low-pressure cylinder can be met, extracted steam is utilized for heat supply to the largest degree, and the advantages of saving occupied land, saving investments and the like are achieved.

Description

technical field [0001] The invention relates to a structure type of a butterfly valve of a medium-pressure cylinder of a steam turbine, which is convenient for adjusting the flow of steam entering the low-pressure cylinder of the steam turbine. Background technique [0002] The heating transformation of thermal power units is an important means to achieve "energy saving and emission reduction". Increasing year by year, unit flexibility transformation work has been carried out one after another. [0003] Before the flexibility transformation of the steam turbine of the thermal power unit, the steam enters the low-pressure cylinder after passing through the high-pressure and medium-pressure cylinders of the steam turbine and the butterfly valve of the medium-pressure cylinder. Part of the steam is used to generate electricity through the generator, and part of the steam enters the exhaust device. There are generally two types of butterfly valves for medium-pressure cylinders ...

AI Technical Summary

Problems solved by technology

In this modification method, the butterfly valve of the medium-pressure cylinder of the steam turbine is completely closed or the minimum flow limit opening of the disc is reduced, so that the passing steam flow is smaller or zero, and the steam inlet flow is adjusted by the added bypass. This modification method requires Add some equipment such as pipelines, throttling parts and regulating valves, the system is complex, the investment is high, and additional space is occupied

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