High-pressure reheating gas-steam combined cycle power generation system and power generation method

Abstract

The invention relates to a high-pressure reheating gas-steam combined cycle power generation system and a power generation method. The system consists of a gas turbine subsystem and a steam turbine subsystem, wherein the gas turbine subsystem comprises a device used for two-stage air compression, twice combustion as well as high-pressure and medium-pressure twice turbine acting; after primary acting of high-temperature gas, the high-temperature gas enters a medium-pressure combustion chamber and is reheated for secondary acting, so that the average heat absorption temperature of the whole cycle is improved; and at least a one-stage intercooler is arranged between two-stage compressors, and heat flow of the intercooler is connected with the two-stage compressors. The steam turbine subsystem adopts a three-pressure reheating type boiler and a steam turbine, cooling water of the intercooler is connected with high-pressure water, and high-pressure, medium-pressure and low-pressure water as well as the cooling water of the intercooler absorb heat in a staged manner for multiple times, so that heat energy is efficiently utilized. When the high-pressure reheating gas-steam combined cycle power generation system provided by the invention operates with the best parameters, the combined cycle efficiency is increased by 3-5 percentage points compared with a combined cycle system which mainly adopts a gas turbine class F, and the single-machine output power is increased by more than 70%, and reaches 800MW class.

Description

technical field [0001] The invention relates to a gas-steam combined cycle power generation device, in particular to a high-pressure reheat gas-steam combined cycle power generation system. The present invention also relates to a power generation method that can use the power generation system. Background technique [0002] The most commonly used steam cycle method for traditional thermal power generation is the Rankine Cycle, but the power generation technology based on the Rankine cycle has problems such as low power generation efficiency, large coal consumption, and serious pollution. The traditional steam cycle power generation method can no longer meet the needs of sustainable social and economic development. As fossil energy, the non-renewable nature of coal and petroleum resources and the increasingly serious environmental problems make researchers pay more and more attention to energy-saving and clean power generation technology. superior. Gas turbine is a kind of ...

AI Technical Summary

Problems solved by technology

As for the GT26 system, it adopts the sequential combustion device (Sequential Combustion Systems) and uses the reheat cycle to achieve a higher pressure ratio. A group of 22-stage high-efficiency subsonic compressors compress the air at twice the pressure ratio of conventional combustion engines. The high pressure is pressed into the ring-shaped environment-friendly combustion chamber, which has extremely high technical requirements for gas turbine equipment and is expensive

Images