Steam water heat recovery and fuel heating integrated efficiency-increasing system for combined-cycle power plant

Abstract

The invention discloses a steam water heat recovery and fuel heating integrated efficiency-increasing system for a combined-cycle power plant. The steam water heat recovery and fuel heating integrated efficiency-increasing system comprises a gas turbine unit, a gas inlet pipeline, a feeding pipeline, a waste heat boiler, a chimney, a steam unit, a steam water heat recovery system and a fuel cycle preheating system. The gas inlet pipeline and the feeding pipeline are connected with the gas turbine unit. The waste heat boiler is connected with an outlet of the gas turbine unit. The chimney is connected with the waste heat boiler. The steam unit is connected with the waste heat boiler. The steam water heat recovery system is connected with a steam turbine. The fuel cycle preheating system is connected with the feeding pipeline and the waste heat boiler. By means of the steam water heat recovery and fuel heating integrated efficiency-increasing system for the combined-cycle power plant, the overall combined-cycle heat efficiency is improved, and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of gas-steam combined cycle power generation, in particular to an integrated efficiency improvement system of steam-water recuperation and fuel heating in a combined cycle power plant. Background technique [0002] With the development of society, human's demand for energy is increasing day by day. Because gas turbines have the advantages of high efficiency, low cost, environmental friendliness, less land occupation, and flexible control, gas-steam combined cycle units or polygeneration projects with gas turbines as the main engine have become power generation projects actively developed by countries all over the world to achieve energy conservation and emission reduction. technology. In China, in addition to heating, gas-steam combined cycle units are more used for power grid peak regulation and frequency regulation, and at the same time, the annual operating hours of the generating units are also strictly...

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Problems solved by technology

However, first of all, this technology will lose part of the superheated steam that can do work. Although the gas cycle efficiency of the gas turbine is increased, the steam cycle efficiency of the steam turbine will be reduced, and the overall thermal efficiency of the combined cycle will be limited; This part of the high-temperature and medium-pressure saturated water is extracted from the steam-water cycle of the steam turbine. After heating the fuel, it returns to the original steam-water cycle to achieve self-circulation. When the fuel leaks, it enters the steam-water cycle, and finally enters the steam turbine and its auxiliary systems and explodes. risks of

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