Chemical-looping combustion device and use method thereof

Abstract

The invention provides a chemical-looping combustion device which is characterized by comprising an air reactor fluidized bed and a cyclone separator connected with the air reactor fluidized bed, and a fuel reactor with a screw feeder at the lower end on the side face is connected with the cyclone separator via a first flowing seal valve; and the upper port of a material return pipe is connected with the fuel reactor via a second flowing seal valve, and the lower port of the material return pipe is connected with the air reactor fluidized bed. The invention also provides a use method of the chemical-looping combustion device, which is characterized in that when a solid fuel is used, the fuel is added into the screw feeder at a constant speed, and water vapor and / or CO2 is introduced from a port C below an air distribution plate of the fuel reactor; when a gas fuel is used, the gas fuel is directly introduced from the port C; and the flowing speed of oxygen carrier particles on a grid plate is adjusted by adjusting the inclination degree of the grid plate. The device provided by the invention can flexibly and effectively control the residence time of the particles in the fuel reactor, the reaction speed is increased, and good separation between the solid fuel and the oxygen carrier can be realized.

Description

technical field [0001] The invention relates to a chemical looping combustion device and a method for using the same, belonging to the technical field of chemical looping systems. Background technique [0002] Chemical looping combustion (Chemical looping combustion) technology is a revolutionary new combustion method, which decomposes the traditional one-step combustion reaction into two steps in the fuel reactor and the air reactor respectively, through the intermediate circulation of oxygen carrier (usually metal oxides) provide oxygen from the air to the fuel. In traditional combustion reactions, because N 2 dilution, the CO in the flue gas 2 The concentration is only about 13%, and it takes a lot of energy to capture it; and in the chemical loop combustion process, the fuel and the air are isolated, so the flue gas generated in the fuel reactor will not be absorbed by the N in the air. 2 Diluted, its main component is CO 2 and H 2 O, high-purity CO can be obtained ...

AI Technical Summary

Problems solved by technology

The serial fluidized bed reactor is similar to the traditional circulating fluidized bed, consisting of a fast bed air reactor and a low speed bubbling bed / turbulent bed fuel reactor, with a flow seal valve between the two reactors However, the simple low-velocity bubbling bed / turbulent bed structure is still difficult to meet the needs of long residence time of particles

The double circulating fluidized bed reactor is composed of two circulating fluidized bed systems connected in series, which brings great difficulties to the system design and operation control, and also increases the economic investment of the system

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