Energy conversion and recovering method of coal gasification supercharging association circulating power generation system

Abstract

The invention relates to a method of energy transformation and recovery of a combined cycle generating system of gasified pressure rise. The method comprises two parts, which are the process of gasifying and purifying coal and gas-vapor combined cycle generating process. Coal gas and high-pressure air are mixed and burnt in a combustion chamber and the produced gas with high temperature and pressure drive an expansion machine to do working, thus providing impetus to a gas booster and an electric generator. Sufficient raw material of air provided by gas turbine system is used as working fluid. The working fluid undergoes the processes of heat exchange and heat control, pressurization, repeated reheat and gradual heating up and the heat of high temperature coal gas is obtained from the outlet of a gasification device, thus making the temperature of the working fluid high enough. And a pressurization wheel is dragged and generates electricity by the turbine expansion action of energy recovery. Afterwards, the procedure of heat exchange and temperature control is practiced. At last, the air with proper pressure and temperature is transported to an air segregating unit that comprises a coal gasification device, a purifying device and a gas-vapor combined cycle generation device. In addition, an energy recovery turbine and a gas compressor and a plurality of heat exchangers driven by the energy recovery turbine are added. The method has the characteristics of easy and reliable practice and simple device structure. Moreover, the method can increase working efficiency of heat recovery turbine and output power, so the generating efficiency of IGCC system is raised by 3 percent, thus achieving the effects of saving energy and reducing consumption.

Description

technical field [0001] The present invention relates to a novel coal gasification pressurized combined cycle power generation system and its device, especially one used in the integrated coal gasification combined cycle power generation system. Air pressurized energy conversion, recovery method and device. Background technique [0002] Integrated coal gasification combined cycle power generation system, referred to as IGCC system, is an advanced power generation system that combines coal gasification technology and high-efficiency combined cycle power generation technology. It consists of two parts: coal gasification and purification process and gas-steam combined cycle power generation process. The main equipment used in the coal gasification and purification process includes: coal preparation device, gasification furnace device, dust removal and purification device, air separation device, etc.; the main equipment used in the gas-steam combined cycle power generation proce...

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