Pulverized coal combustion method and device with function of capturing CO2

Abstract

The invention provides a pulverized coal combustion method with the function of capturing CO2, comprising the steps: CuFe2O4 is decomposed to generate O2 and oxygen vacancy ferrite CuFe2O4-delta (delta is no less than 0 but no more than 2); oxidation reaction is generated between the pulverized coal and the oxygen vacancy ferrite so as to generate CO2, H2O and non-condensed gas, wherein the oxidation reaction is generated between the non-condensed gas and O2 which is obtained by decomposition so as to generate CO2 and steam. The device for achieving the method comprises a loop which is formedby the communication of a fast fluidized bed, a first cyclone separator, a two-stage type bubbling fluidized bed, a U-type flow seal valve and the fast fluidized bed in sequence; and the bubbling fluidized bed is also communicated with a second cyclone separator which is communicated with an ash catching device. The pulverized coal combustion method with the function of capturing CO2 effectively combines a pure oxygen combustion technology of coal with a chemical chain combustion technology, not only lowers the preparation cost of the pure CO2, but also fully realizes the separation of the high-concentration CO2 after the coal reaction.

Description

technical field [0001] The invention relates to a pulverized coal combustion method and device. Background technique [0002] With the rapid increase in energy demand and the sharp increase in the use of fossil fuels, leading to the greenhouse gas CO 2 Accumulation in nature continues to increase, controlling CO in the process of fossil fuel combustion 2 emissions play an important role in addressing the greenhouse effect and global warming. Especially for China, given its energy structure dominated by coal, CO 2 In view of the fact that the level of emissions has increased sharply and has already ranked second in the world, the development of efficient coal-fired CO 2 Emission reduction technology to control my country's coal-fired CO 2 The emission level has great social significance and economic value. [0003] In the traditional pulverized coal combustion technology, due to the N in the air 2 For the dilution of coal combustion tail gas, the CO in the coal combusti...

AI Technical Summary

Problems solved by technology

However, when coal is used as fuel, because the gasification rate of coal is much lower than the reaction rate of oxygen carrier and coal gasification product, the reaction between coal and oxygen carrier is incomplete, and the tail gas of coal reaction contains CO, H 2 and CH 4 Waiting for non-condensable gas, giving the CO in the tail gas 2 The separation of the

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