Combined steam method of gas-steam combined cycle unit

Abstract

The invention discloses a gas-steam combined circulation machine unit which comprises a steam turbine and two gas turbines, wherein each gas turbine comprises a combustion engine, a boiler, a high pressure system and an intermediate pressure system; each boiler comprises a main high pressure steam pipeline and a re-heater; the re-heater comprises a main re-heating steam pipeline; the gas-steam combined circulation machine unit further comprises a first high pressure detection device arranged on the main high pressure steam pipeline, a second high pressure detection device arranged between a high pressure bypass valve and the re-heater, a third high pressure detection device for detecting the pressure of a high pressure cylinder, a first intermediate pressure detection device arranged on the main re-heating steam pipeline, and a controller for controlling a main steam valve, a re-heating steam valve, the high pressure bypass valve, a intermediate pressure bypass valve and an inlet adjusting valve. According to the gas-steam combined circulation machine unit, the operation safety of the machine unit can be improved; meanwhile, the starting speed of the machine unit can be increased; energy is saved; the operation intensity of an operator is lowered and the manual mis-operation is avoided.

Description

technical field [0001] The invention relates to a power generation equipment, in particular to a method for paralleling steam of a gas-steam combined cycle unit. Background technique [0002] The gas-steam combined cycle unit adopts the "two-to-one" operation mode, that is, two gas turbines operate with one steam turbine, and the exhaust gas of the gas turbine is introduced into the waste heat boiler, and the high-temperature and high-pressure steam generated drives the steam turbine, which drives the steam turbine to generate electricity. [0003] At present, those skilled in the art generally have the following two methods when combining steam: simultaneously combining main reheat steam, first combining medium-pressure steam and then combining high-pressure steam. [0004] In the existing technology, the main reheat steam is operated manually at the same time, and the specific steps are as follows: when the first gas turbine has been started, the steam turbines are running...

AI Technical Summary

Problems solved by technology

Due to the manual operation of this method, it poses a serious threat to the safety of the unit during the switching process of the complex working conditions of the large unit. At the same time, it also slows down the startup speed of the unit, wastes energy and increases the operating intensity of the operator, which is likely to cause misoperation. Appearance of phenomenon

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