CO2 trapping system based on chemical-looping combustion coupled supercritical hydrothermal reaction, and working method

Abstract

The invention relates to a CO2 trapping system based on a chemical-looping combustion coupled supercritical hydrothermal reaction, and a working method. In an existing chemical-looping combustion cycle reaction, an oxygen carrier is sintered and melted, and consequently the cycle reaction rate is decreased. The CO2 trapping system comprises a chemical-looping combustion system which comprises an air reactor, a pyrolyzing furnace, a fuel reactor and a cyclone separator, and the pyrolyzing furnace is connected with the air reactor. The CO2 trapping system is characterized by further comprising aCO2 storage device, a coal water slurry system and a supercritical hydrothermal reaction system, wherein the coal water slurry system comprises coal grinding equipment, a water storage tank, a mixingtank, a colloid tank and a slurry storage tank, and the water storage tank, the mixing tank, the colloid tank and the slurry storage tank are sequentially connected through pipelines; and the supercritical hydrothermal reaction system comprises a high-pressure coal water slurry pump, a supercritical water oxidation reactor, a preheater and a CO2 separator, and the preheater is connected with thesupercritical water oxidation reactor. The chemical-looping combustion economy and the energy utilization efficiency are improved, and CO2 can be trapped with the low cost and low energy consumption.

Description

technical field [0001] The present invention relates to CO 2 The field of capture and fossil fuel combustion, especially involving a CO based on chemical looping combustion coupled with supercritical hydrothermal reaction 2 Capture system and working method. Background technique [0002] CO in Earth's atmosphere since industrial civilization 2 The concentration has risen sharply due to human production activities. CO 2 As a typical greenhouse gas, it directly leads to the greenhouse effect. Currently, CO 2 The emission reduction can be achieved by adjusting the energy structure and improving energy conversion and utilization efficiency. [0003] From the perspective of energy structure, since the situation that human beings use fossil energy as the main energy source will not change in the short term, especially in my country, where coal occupies an absolute dominant position from the reserve composition to the energy consumption system, how to make the energy system e...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problems such as the reduction of the cycle reaction rate caused by the sintering and melting of the oxygen carrier in the chemical looping combustion cycle reaction, and the inability of the residual coke to fully react with the oxygen carrier after coal pyrolysis, and provide a chemical looping combustion based CO coupled supercritical hydrothermal reaction 2 Capture system and working method

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