Method and device for zero emission of CO2 from burning coal

Abstract

The invention provides a method for zero emission of CO2 from burning coal. The method comprises the following steps: MFe2O4 (M stands for any of Cu, Ni, Mn and Co) oxygen carrier is decomposed to generate oxygen deficient ferrite MFe2O4-delta (delta is more than or equal to 0 and is less than or equal to 2) and O2, the oxygen deficient ferrite and coal gasified products carry out reduction reaction to generate CO2, H2O and noncondensable gas, wherein the noncondensable gas and the O2 which is obtained by decomposition carry out oxidation reaction to generate CO2 and steam; and the generated CO2 and steam and the reduced oxygen deficient ferrite carry out reduction reaction to generate synthetic gas consisting of CO and hydrogen, thus realizing zero emission of CO2. The invention also provides a device for realizing the method, and main components of the device are a rapid fluidized bed, a two-section spouted-fluidized bed and a bubbling fluidized bed. The method and the device realize efficient and clean use of the burning coal and true zero emission of CO2, avoid energy and cost consumption of long-distance transmission of CO2 and have wide application prospect.

Description

technical field [0001] The invention relates to the field of coal combustion, in particular to CO in the process of coal combustion 2 Zero emission method and apparatus. Background technique [0002] While coal-based fossil fuels provide more than 85% of the world's energy consumption, the CO produced by the coal combustion process 2 CO produced by human activities 2 a major source of . Coal-fired CO Control 2 emission levels, developing efficient coal-fired CO 2 Emission reduction technology has great social significance and economic value. Compared with improving the efficiency of coal-fired power generation, promoting energy substitution and adopting low-carbon fuels (such as natural gas and biomass, etc.), the two CO 2 Emission reduction technology route, the CO produced by coal combustion 2 The route of capture and post-storage treatment (referred to as the CCS route) is more active and effective, and can effectively realize coal-fired CO2 without changing the cu...

AI Technical Summary

Problems solved by technology

There are mainly two approaches: one is based on the integrated gasification combined cycle (IGCC) CO 2 Separation system, but the complexity of the device and its system and the high initial investment greatly limit the popularization and application of this technology; the second is based on limestone and other CO 2 Dry Absorbent Based CO 2 Zero-emission system, although the United States Zero Emissions Coal Utilization Alliance (ZECA), Japan's New Energy Comprehensive Development Organization (NEDO), Zhejiang University and many other research institutions around the world have adopted

But the above two kinds of coal CO 2 The biggest flaw of the zero-emission system is that what the system produces is only high concentrations of CO 2 , the obtained CO 2 Further off-line post-processing is required for marine or geological storage, which consumes cost and energy, and also causes potential harm to the environment

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