Brayton-cascade steam Rankine combined cycle power generation system

Abstract

The invention relates to a Brayton-cascade steam Rankine combined cycle power generation system. The gas exhaust of a Brayton cycle is adopted as a heat source for a high-temperature end steam Rankine cycle, a steam condenser in a high-pressure end steam Rankine cycle is adopted as one of heat sources for a low-pressure end steam Rankine cycle, the latent heat of vaporization of the steam in the high-pressure end steam Rankine cycle is efficiently recovered to be used for power generation in the low-pressure end steam Rankine cycle, consequently, the load of the steam condenser of the conventional steam Rankine cycle system can be effectively reduced by more than absolute 20 percent, and by adopting a system optimization technique, the absolute thermal efficiency of the cycles of the whole system can be increased by more than 5 percent. The Brayton-cascade steam Rankine combined cycle power generation system not only can be used in the energy-saving alteration of conventional units, but also can be used in the design and construction of new units, and economic, social and environmental protection benefits are remarkable.

Description

technical field [0001] The invention relates to a Breton-cascade steam Rankine combined cycle power generation device, specifically belonging to the technical field of thermal power plant power devices. Background technique [0002] Gas-steam combined cycle has a series of advantages such as high thermal efficiency, fast start-up speed, good environmental protection conditions, short installation period, low investment cost, etc., coupled with the rapid development of gas turbine technology in recent years, the single unit power of gas turbine is also increasing continuously, combined cycle The research has attracted the attention and implementation of countries all over the world. [0003] The research on combined cycle power generation technology in foreign countries began in the late 1960s. After decades of development, at present, the gas-steam combined cycle power generation technology in many developed countries such as the United States, the United Kingdom, and Japan ...

AI Technical Summary

Problems solved by technology

Although this part of waste heat resources is a huge waste, it is difficult to recycle it. The main reasons are: (1) The quality of waste heat is low, and no effective utilization method has been found; (2) Recovery of this part of waste heat is often harmful to boilers. It is risky to make major changes to the original thermal system; (3) The heat balance problem is difficult to organize, and it is difficult to use it directly in the factory. It is often necessary to look for suitable heat users outside, and the heat load of heat users is often Will fluctuate, limiting the generalizability of the recovery method

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