Fuel coal chemical looping combustion CO2 separation method in coupling with pure oxygen gasification

Abstract

The invention provides a fuel coal chemical looping combustion CO2 separation method in coupling with pure oxygen gasification. In a fuel reactor, a gasification agent (B) composed of water vapor and a small amount of oxygen enters from the bottom of a bed of a bubbling fluidized bed gasification furnace (1), the bed material (C) is coarse-grained inert material and performs fluidization movement under the action of the gasification agent and forms a dense phase zone; fine powdered coal (A) is added into the bubbling fluidized bed gasification furnace (1) from the dense phase zone and performs gasification reaction with the gasification agent (B), so as to form coal gas and unburned carbon (D); oxygen carrier particle (E) enters from the bottom of a lifting pipe (2) and reacts with the combustible components such as CO, H2 and CH4 in the coal gas, so as to generate CO2 and H2O. The flue gas composed of CO2, water vapor, uncompleted burned combustible gas and tiny amount of carbon-containing fine fly ash enters into a reburning chamber (13), wherein the combustible gas and the carbon in the fine fly ash perform combustion reaction with oxygen (J) from an oxygen inlet (14) of the reburning chamber, so as to generate CO2 and H2O.

Description

technical field [0001] The invention belongs to the field of clean combustion and high-efficiency utilization of coal, and relates to a coal-fired chemical chain combustion that couples pure oxygen oxidation to separate CO 2 method. Background technique [0002] Since the industrial revolution, with the increase of greenhouse gas emissions in the atmosphere, the greenhouse effect has been continuously enhanced. CO 2 It is the greenhouse gas with the largest emission, and it also accounts for the largest share of the total radiation intensity of greenhouse gases. Therefore, research on coal-burning CO 2 Emission reduction technology is the top priority to deal with the greenhouse effect. Chemical looping combustion (Chemical Looping Combustion, referred to as CLC) is a new flameless combustion technology, the traditional burner is divided into two independent reactors (fuel reactor and air reactor), and a suitable oxide (loaded Oxygen) circulates alternately between the t...

AI Technical Summary

Problems solved by technology

[0008] Technical problem: The purpose of the present invention is to provide a coal-fired chemical looping combustion that couples pure oxygen oxidation to separate CO 2 The method overcomes the defects that the fuel reactor in the conventional coal-fired CLC system is difficult to achieve self-heating and cannot maintain a high reaction temperature, and solves the low carbon conversion rate in the fuel reactor, the high concentration of combustible gases such as CO at the system outlet, and the oxygen carrier wear and other problems, to improve the combustion efficiency of the system and CO 2 capture rate, while saving equipment investment and operating costs

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