Operation control method of low voltage bypass in thermal power generating set

Abstract

An operation control method for a low-pressure bypass of a thermal power generating set, characterized in that: according to different operating conditions of the thermal generating set, the set value of the reheat steam pressure of the low-pressure bypass of the thermal generating set is limited. Compared with the prior art, the method provided by the present invention can control the steam pressure of the reheater of the low-pressure bypass according to the different operating stages of the unit, effectively meeting the needs of the high-pressure and medium-pressure cylinders of the gas turbine for combined flushing and ensuring high pressure The cylinder exhaust is unobstructed, which further ensures the smooth rise, stable operation and smooth decline of the main steam pressure of the boiler. At the same time, it can also control the rapid increase of the steam temperature of the boiler so that it can quickly match the metal temperature of the gas turbine cylinder, which is suitable for the constant pressure operation and sliding of the unit. Combined pressure and operation mode, so as to shorten the start-up time of the unit and reduce the discharge of steam to the air, reduce the life loss of the turbine, and realize the optimal start-up of the unit.

Description

technical field [0001] The invention relates to the field of operation control of a thermal power generating set, in particular to an operation control method for a low-voltage bypass of a thermal generating set. Background technique [0002] The principle of thermal power generation is generally: coal, oil, natural gas, gas and other fuels are used as fuel, and the treated fuel is delivered to the boiler by using transmission technology. The fuel is burned to heat the boiler to turn the water in the boiler into steam. After that, the water vapor enters the high-pressure cylinder. In order to improve thermal efficiency, the water vapor should be reheated. The water vapor enters the medium-pressure cylinder, and the steam from the medium-pressure cylinder is used to drive the blades of the steam turbine to drive the generator to generate electricity. The steam is drawn from the medium-pressure cylinder into the symmetrical low-pressure cylinder. Part of the steam that has bee...

AI Technical Summary

Problems solved by technology

The traditional bypass control strategy is obviously not enough, it is imperative to develop a new control strategy