US 10,899,982 B2 · Integrated coal gasification combined power generation process with zero carbon emission

Abstract

The present disclosure relates to the technical field of coal chemical industry, and particularly discloses an integrated coal gasification combined power generation process with zero carbon emission, the process comprising: pressurizing air for performing air separation to obtain liquid oxygen and liquid nitrogen, wherein the liquid oxygen is used for gasification and power generation, the liquid nitrogen is applied as the coolant for the gasification and power generation, the liquid nitrogen and a part of liquid oxygen stored during the valley period with low electricity load are provided for use during the peak period with high electricity load; the pulverized coal delivered under pressure and high-pressure oxygen enter a coal gasification furnace for gasification, so as to generate high-temperature fuel gas, which subjects to heat exchange and purification, and then the high-pressure fuel gas enters into a combustion gas turbine along with oxygen and recyclable CO2 for burning and driving an air compressor and a generator to rotate at a high speed; the air compressor compresses the air to a pressure of 0.4˜0.8 MPa, and the generator generates electricity; the high-temperature combustion flue gas performs the supercritical CO2 power generation, its coolant is liquid oxygen or liquid nitrogen; the heat exchanged combustion fuel gas subsequently perform heat exchange with liquid nitrogen, the liquid nitrogen vaporizes to drive a nitrogen turbine generator for generating electricity, the cooled flue gas is dehydrated and distilled to separate CO2, a part of CO2 is used for circulation and temperature control, and another portion of CO2 is sold outward as liquid CO2 product. The power generation process provided by the present disclosure not only solves the difficult problems of high water consumption, low power generation efficiency and small range of peak load adjustment capacity of the existing IGCC technology; but also can compress air with high unit volume for energy storage with a high conversion efficiency, and greatly reduce load of the air compressor, thereby perform CO2 capture and utilization with low-cost, zero NOx emission and discharging fuel gas at a normal temperature, and significantly improve the power generation efficiency.

Claims14

Dependent claims

An integrated coal gasification combined power generation process with zero carbon emission, the process comprising:

1) introducing pressurized air with a pressure 0.4 to 0.8 MPa into an air separation facility for performing air separation to obtain liquid oxygen and liquid nitrogen;
2) performing heat exchange at a first cooler between at least a part of the liquid oxygen and high-temperature CO2 from an outlet of a first supercritical CO2 generator, so as to generate high-pressure vaporized oxygen and recyclable CO2;
3) subjecting at least a part of the high-pressure vaporized oxygen and pulverized coal to a gasification reaction in a coal gasification furnace to obtain a high-temperature and high pressure fuel gas, carrying out heat exchange of the high-temperature and high-pressure fuel gas in a first CO2 waste heat boiler to perform a first supercritical CO2 power generation;
4) purifying high-pressure fuel gas obtained by the heat exchange in step 3) to obtain high-pressure purified fuel gas;
5) pumping the high-pressure vaporized oxygen remaining after step 3) and the high-pressure purified fuel gas jointly into a combustion gas turbine for burning and swelling to drive an air compressor and a generator to generate electricity and to obtain a high-temperature combustion flue gas;
6) subjecting the high-temperature combustion flue gas obtained in step 5) to heat exchange in a second CO2 waste heat boiler to perform a second supercritical CO2 power generation, and coolant of the second supercritical CO2 power generation is at least part of the liquid oxygen and/or at least part of the liquid nitrogen;
7) performing heat exchange of heat exchanged combustion flue gas obtained in step 6) with at least part of the liquid nitrogen through a vaporizer to obtain a staged cooled flue gas, wherein the vaporization of liquid nitrogen drives a nitrogen turbine generator to generate electricity.

4 more elements

Dependencies are inferred from the claim text.

Integrated coal gasification combined power generation process with zero carbon emission

Life of this patent

Integrated coal gasification combined power generation process with zero carbon emission

Life of this patent

Abstract

Claims14