Chemical chain combustion method for coalbed methane, and interconnected fluidized bed system

Abstract

The invention provides a chemical chain combustion method for coalbed methane and an interconnected fluidized bed system. The method comprises the following steps: carrying out oxidization reaction on preheated air and a nanocopper oxygen carrier to generate nano CuO oxygen carrier particles and flue gas; then carrying out combustion reaction on nano CuO oxygen carrier particles and coalbed methane under lighting to generate a mixed gas and a nanocopper oxygen carrier; enabling the nanocopper oxygen carrier to repeat the steps; condensing and collecting the mixed gas, wherein the nanocopper oxygen carrier is formed by mixing nano CuO and inert carriers according to the ratio of (1.5-3.5) to 1, and the particle size of the nano CuO is 20-40nm. The system comprises an air heating device, a high-speed lifting fluidized bed, a cyclone separator, a first overflowing device, a bubbling fluidized bed, a heat recovery device and a CO2 collector which are sequentially connected, and an illumination device is arranged in the bubbling fluidized bed. The circulating times of the oxygen carrier can be increased by 23%, and the oxidization rate of surface deposits on the oxygen carrier is increased to 44.23%-75.11%.

Description

technical field [0001] The invention relates to the field of chemical looping combustion, in particular to a chemical looping combustion method of coal bed gas and a serial fluidized bed system. Background technique [0002] As we all know, my country's energy structure is very irrational, and the development of new energy industries has become a major issue to be solved urgently in our country and even in countries around the world today. Among them, coalbed methane, as an associated mineral resource of coal, occurs in coal seams and is a kind of gas with methane as the main component. , mainly adsorbed on the surface of coal matrix particles, partly free in coal pores or dissolved in coal seam water hydrocarbon gas. In the past ten years, coalbed methane, as a clean and high-quality new energy rising in the world, has been paid more and more attention by countries all over the world, just like the exploration and development of natural gas and natural gas hydrate. [0003]...

AI Technical Summary

Problems solved by technology

[0009] However, there is still a thorny problem in the chemical looping combustion technology, that is, the carbon deposition problem of the oxygen carrier

The initial investment of the chemical chain burner is larger than that of the ordinary combustion furnace. It also needs to add oxygen carrier during the combustion process. If the cycle life of the oxygen carrier is poor and there is carbon deposition, this will undoubtedly increase the operating cost. Therefore, the oxygen carrier must have excellent cycle performance to ensure the overall benefits of chemical looping combustion technology

Taking copper-based oxygen carriers, which are widely studied at present, compared with other metal oxygen carriers such as iron, nickel, manganese, etc., it has better catalytic conversion performance and lower cost, but there are serious accumulation problems. Charcoal phenomenon

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