Combustion method of low-concentration combustible gas and fluidized reactor

Abstract

The invention discloses a combustion method of low-concentration combustible gas, which comprises the following steps of: firstly, introducing the low-concentration combustible gas and combustion-supporting air respectively into a heat exchanger for heat exchange; then introducing the low-concentration combustible gas and the combustion-supporting air after the heat exchange into a mixing cavity of a fluidized reactor for mixing; then introducing the mixed gas into a combustion cavity of a combustor through an air distributor for combustion; and taking the combusted gas as a heat source of the heat exchanger. The invention also provides the fluidized reactor to realize the method. The invention can not only enable the low-concentration combustible gas to be ignited reliably and combusted stably, but also ensure small temperature fluctuation inside the fluidized reactor; the combustion cavity can be used as both a reactor and a heat accumulator; the fluidized reactor has a wider loading adjusting range when working under ordinary pressure, and the mixed gas can keep combusting when the concentration of combustible components is higher than 2 percent; therefore, the invention is suitable for the combustion of the low-concentration combustible gas.

Description

technical field [0001] The invention relates to a combustion method of low-concentration combustible gas and a burner thereof, in particular to a method for combusting low-concentration combustible gas by using a fluidized reactor and the fluidized reactor. Background technique [0002] In the production process of coal mining, chemical industry, petroleum industry and steel industry, a large amount of waste gas containing flammable gases such as methane, carbon monoxide and hydrogen will be produced. The concentration of combustible gas in exhaust gas is often lower than 10%, or even lower than 5%, and combustible gas with a concentration lower than 10% is usually called low-concentration combustible gas. Taking coal mining as an example, the main combustible gas of mine gas waste gas is methane, and because of the low concentration of methane and large concentration changes, it is difficult for this low-concentration combustible gas to be ignited or maintain stable combust...

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Problems solved by technology

[0009] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems of low calorific value of low-concentration combustible gas, large range of variation in combustible component concentration, and difficulty in stable combustion, and provide a method for burning low-concentration combustible gas in a fluidized reactor. Methods

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