IGCC (Integrated Gasification Combined Cycle) poly-generation device and method based on pyrolysis and gasification of low metamorphic powdered coal

Abstract

The invention discloses an IGCC (Integrated Gasification Combined Cycle) poly-generation device and method based on pyrolysis and gasification of low metamorphic powdered coal. The device comprises a pyrolysis / gasification system, a coal gas purifying system, a circulating fluidized bed boiler and a gas turbine / steam turbine system. The method comprises the steps as follows: carrying out low temperature pyrolysis and partial air gasification on the low metamorphic powdered coal, grading and converting into coal gas, tar and semi-coke, and carrying out the IGCC poly-generation process by the semi-coke and the coal gas with high calorific value. According to the device and the method, the tar, sulphur and other chemical products can be produced while clean power is generated, the products obtained by grading and converting the low metamorphic powdered coal are fully utilized, the material conversion and energy conversion functions are integrated, the resource utilization rate is high, and the heat energy efficiency is high. The device and method are suitable for the low metamorphic powdered coal such as peat, brown coal, jet coal, non-sticking coal and the like, and the particle size of raw materials is 0-8 mm. The high-temperature coal gas generated in a fluidized bed gasification furnace contains a large amount of hydrogen, so that the powdered coal can be subjected to hydropyrolysis, and the tar recovery rate can reach more than 12%.

Description

Technical field [0001] The invention relates to an IGCC polygeneration process device and a method, in particular to an IGCC polygeneration device and method based on pyrolysis and gasification of low-deterioration pulverized coal. Background technique [0002] Compared with traditional coal-fired power generation devices, the integrated gasification combined cycle power generation system (IGCC) has the characteristics of low unit heat consumption, water saving, small footprint, low emissions of sulfur, nitrogen oxides and particulate matter, and the by-products of coal gasification can be realized The advantages of comprehensive utilization of coal chemical industry can better solve a series of major issues in the energy field, such as energy supply and demand and consumption structure, ecological environment protection and high-efficiency, low-consumption power stations, etc., and will become a competitive power generation method in my country. However, IGCC has high invest...

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Problems solved by technology

However, IGCC has high investment costs, cannot compete with conventional coal-fired power plants economically, and is not flexible enough to operate, so it can generally only be used as a base-load power plant.

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