A Chemical Looping Combustion Air Reactor with Enhanced Oxidation and Regeneration of Oxygen Carriers

Abstract

The invention belongs to the field of fluidized beds and multi-phase flow, and particularly relates to a chemical looping combustion air reactor for enhancing oxidation regeneration of an oxygen carrier. The chemical looping combustion air reactor comprises a reaction chamber, a first lift pipe, a composite internal member and a second lift pipe, wherein a feeding port is arranged on the side wallof the reaction chamber; an air inlet is arranged at the bottom of the reaction chamber; the reaction chamber and the first lift pipe are connected by adopting a first reducing pipe; and the composite internal member is mounted between the first lift pipe and the second lift pipe, and comprises a second reducing pipe, a ring-shaped internal member, a guide pipe, a supporting plate and an inclinedring-shaped internal member. By the adoption of the chemical looping combustion air reactor, the problem that in the prior art, the radial distribution of an oxygen carrier in a lift pipe is not uniform and the oxidation regeneration efficiency is not high can be solved; and the residence time of the oxygen carrier can be effectively prolonged, the oxidation regeneration efficiency of the large-grain-size oxygen carrier can be improved, and then the chemical looping combustion efficiency can be improved.

Description

technical field [0001] The invention belongs to the field of fluidized bed and multiphase flow, in particular to a chemical looping combustion air reactor for strengthening oxidation regeneration of oxygen carrier. Background technique [0002] CO 2 It is one of the most influential greenhouse gases, reducing CO emissions 2 It is of great significance to alleviate the greenhouse effect. Chemical looping combustion is internationally recognized as a promising CO 2 One of the emission reduction technologies. The chemical chain technology uses a fuel reactor and an air reactor to replace the traditional reactor. The basic principle is to use the oxygen carrier to circulate between the fuel reactor and the air reactor to complete the transfer of oxygen, thereby realizing the conversion of fuel. Since the fuel and air are not in direct contact, when the fuel is completely reacted, the fuel reactor outlet product only includes CO 2 and H 2 O, no N 2 , high-purity CO can be ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned gas-solid flow in the riser has great inhomogeneity, which is mainly reflected in the S distribution or exponential distribution of "thin at the top and thick at the bottom" in the axial direction. core" heterogeneous structure

There are a large number of agglomerates near the wall, and the presence of agglomerates leads to poor local gas-solid contact, which reduces the oxidation regeneration efficiency of the oxygen carrier

In order to solve the problems of low gas-solid contact efficiency and low oxygen carrier oxidation regeneration efficiency caused by the agglomerates in the air reactor of the chemical looping combustion device, there are currently many methods

[0005] A variable-diameter air reactor disclosed at present (Su Mingze, Zhao Haibo, Ma Jingchen, et al. Thermal CFD simulation of chemical looping combustion serial fluidized bed system[J]. Combustion Science and Technology, 2015(4): 363-369 .), the oxygen carrier is mainly oxidized and regenerated in the lower dense phase zone, but the particle agglomeration phenomenon in the upper riser is more obvious, which affects the oxidation regeneration efficiency of the oxygen carrier and reduces the stability of the system operation

[0006] Chinese patent CN102705822A discloses a cross-flow moving bed air reactor. The oxygen-depleted oxygen carrier reacts with air in the cross-flow moving bed to improve the reaction rate of the oxygen carrier. However, the cross-flow moving bed is generally large in volume. It is inconvenient to manufacture, and due to the reverse flow of the oxygen carrier and the air flow, the residence time of the oxygen carrier is short, which is not conducive to the oxidation regeneration of the oxygen carrier

[0007] Chinese patent CN107270282A discloses a multi-stage tower-type counter-flow bed air reactor, which adopts a multi-stage air distribution structure to improve the oxygen carrier regeneration efficiency, but its structure is complicated, which will cause inconvenience in installation, manufacture and maintenance. The wind structure increases the difficulty of control and reduces the reliability of operation

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