Device and method for conducting high pressure cylinder warming on gas-steam combined cycle unit

Abstract

The invention discloses a device and method for conducting high pressure cylinder warming on a gas-steam combined cycle unit. The device comprises a reflux cylinder warming passage, a reflux valve and a reflux exhaust valve. The reflux cylinder warming passage is communicated with a steam source of reflux cylinder warming steam and a high pressure cylinder, the heat of the reflux cylinder warming steam is transferred to the high pressure cylinder when the reflux cylinder warming steam flows through the reflux cylinder warming passage, and therefore metal temperature of the high pressure cylinder is increased; the reflux valve is arranged on the reflux cylinder warming passage and located between the high pressure cylinder and the steam source of the reflux cylinder warming steam, the reflux valve is opened when the preset condition is met, and reflux cylinder warming steam enters the high pressure cylinder through the reflux valve; the reflux exhaust valve is arranged between the high pressure cylinder and a condenser, and the reflux cylinder warming steam in the high pressure cylinder is exhausted to the condenser. According to the device and method for conducting high pressure cylinder warming on the gas-steam combined cycle unit, existing equipment is utilized to the maximum, meanwhile, cylinder warming efficiency is improved, cylinder warming time is reduced, the service life of the unit is prolonged, and the purpose of energy conservation and emission reduction is achieved.

Description

technical field [0001] The invention relates to cold start of a gas-steam combined cycle unit, in particular to a device and method for warming a high-pressure cylinder of a gas-steam combined cycle unit during cold start. Background technique [0002] The working process of the gas turbine is: the compressor continuously inhales air from the atmosphere and compresses it; the compressed air enters the combustion chamber, mixes with the injected fuel and burns to become high-temperature gas, which enters the gas turbine to expand and perform work. Drive the generator to output electric energy. [0003] The gas-steam combined cycle unit is a gas turbine that discharges high-temperature residual gas to the waste heat boiler, where the high-temperature residual gas heats the heating surface so that the water in the tube panel generates superheated steam up to 650°C, and the superheated steam is sent to the steam The turbine does work, drives the turbogenerator to output electri...

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Problems solved by technology

However, since the high-pressure cylinder is in a vacuum state during idling, the size of the high-pressure rotor rotor blades is relatively short, and the warm-up effect is poor, and this method prolongs the start-up time of the unit and increases the running time of the gas turbine under low-load conditions, causing the unit to Low efficiency and shortened gas turbine life, poor economy, and when the unit works under low load conditions, it will emit more exhaust gas, the main component of which is NO ｘ , CO, CO 2

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