Carbon-based fuel chemical chain combustion gasification coupling device and method

Abstract

The present invention provides a carbon-based fuel chemical chain combustion gasification coupling device comprising a moving bed fuel reactor, a fast bed air reactor, a cyclone separator and an oxygen carrier storer; the moving bed fuel reactor includes a drying pyrolysis section I, a gasification section II and a combustion section III; a feeding device is arranged on one end of the drying pyrolysis section I, and the other end of the drying pyrolysis section I is connected to one end of the gasification section II, the other end of the gasification section II is in communication with one end of the combustion section III, and the combustion section III is sequentially connected to the fast bed air reactor, the cyclone separator and the oxygen carrier storer through a pipeline to form aclosed loop; tan active oxygen carrier is placed in the oxygen carrier storer; and a gasification agent distribution device is disposed at the bottom of the combustion section III. The carbon-based fuel chemical chain combustion gasification coupling device can prolong the time of gas-solid and solid-solid contact in the reactor, thereby improving the conversion rate of a carbon-based fuel, and can realize the preparation of crude gas, clean gas and the effective separation of CO2.

Description

technical field [0001] The invention relates to the field of fuel low-carbon conversion combustion equipment, in particular to a carbon-based fuel chemical looping combustion gasification coupling device and method. Background technique [0002] Chemical looping combustion technology (Chemical Looping Combustion, CLC) is a CO 2 The new combustion technology with internal separation features can realize CO 2 At the same time, this technology satisfies the principle of energy cascade utilization, which can improve the energy utilization efficiency in the system; in addition, this technology can suppress NO x generation. Therefore, the application of chemical looping combustion technology in the conversion process of fuel is of great help in reducing my country's CO 2 It is of great significance to realize the economical, efficient and clean utilization of fuel. [0003] At present, the basic way to realize the conversion of carbon-based fuels by using chemical looping comb...

AI Technical Summary

Problems solved by technology

However, the technical problem of this method is that the gasification rate of carbon-based fuels is low compared with the combustion rate of gasification products, and the gasification process is a rate-limiting step.

In addition, due to the limitation of the temperature resistance of the oxygen carrier, the temperature of the air reactor and the fuel reactor is relatively low (generally <1200°C), and the low reaction temperature and low gasification rate will cause the reaction rate to be very slow and the carbon to be incomplete. conversion will also seriously affect the conversion rate of carbon-based fuels, which limits the large-scale promotion and application of carbon-based fuel chemical looping combustion technology

Most of the current fuel reactors use fluidized bed reactors. The residence time of carbon-based fuels and oxygen carriers in this reactor is short, resulting in a large loss of unconverted carbon, which is mainly manifested in the carbon in small particles of fly ash will be destroyed. The flue gas is carried out of the fuel reactor, resulting in a decrease in carbon conversion rate, while the large-sized unconverted carbon particles will circulate into the air reactor and be oxidized by air, resulting in a decrease in carbon capture efficiency

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