High-pressure steam system for two-pull-one unit of fuel gas thermal power plant and start-stop control method of high-pressure steam system

Abstract

The invention relates to a high-pressure steam system for a two-pull-one unit of a fuel gas thermal power plant and a start-stop control method of the high-pressure steam system. The high-pressure steam system comprises a first high-pressure steam system, a second high-pressure steam system and a steam turbine high-pressure cylinder, wherein the first high-pressure steam system comprises a first high-pressure steam pipeline, a first high-pressure steam converging electric door, a first high-pressure steam converging bypass electric door, a first high-pressure bypass control valve, a first high side temperature-reducing water pipeline, a first high side temperature-reducing water regulating valve and a first high side temperature-reducing water electric valve; the second high-pressure steam system comprises a second high-pressure steam pipeline, a second high-pressure steam converging electric door, a second high-pressure steam converging bypass electric door, a second high-pressure bypass control valve, a second high side temperature-reducing water pipeline, a second high side temperature-reducing water regulating valve and a second high side temperature-reducing water electric valve. According to the invention, automatic investment can be realized in the steam withdrawing state of the medium-pressure steam system on the side; in the investment state, automatic steam withdrawing or automatic steam converging of the medium-pressure steam system on the side is realized.

Description

technical field [0001] The invention relates to the high-pressure steam technology of a gas-fired thermal power plant, in particular to a high-pressure steam system of a two-to-one unit in a gas-fired thermal power plant and a start-stop control method thereof. Background technique [0002] The main function of the high-pressure steam system in a gas-fired thermal power plant is to connect the high-pressure steam drum of the waste heat boiler to the high-pressure cylinder of the steam turbine to do work. If the pressure difference between the front and rear of the electric parallel valve is balanced, it is impossible to isolate the exhaust steam from the high-pressure cylinder to the medium-pressure drum reheater. In addition, the existing high-pressure steam system of the gas-fired thermal power plant cannot realize the automatic input of the high-pressure steam system on the local side when the high-pressure steam system on the local side is withdrawn; When the high-press...

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Problems solved by technology

[0002] The main function of the high-pressure steam system in a gas-fired thermal power plant is to connect the high-pressure steam drum of the waste heat boiler to the high-pressure cylinder of the steam turbine to do work. To balance the pressure difference between the front and back of the parallel steam electric door, it is impossible to isolate the high-pressure cylinder exhaust steam to the medium-pressure steam drum reheater

In addition, the existing high-pressure steam system of the gas-fired thermal power plant cannot realize the automatic input of the high-pressure steam system on the local side when the high-pressure steam system on the local side is withdrawn; When the high-pressure steam system on the other side is put into operation, the automatic paralleling of the high-pressure steam system on this side can be realized.

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