Burning method of gas fuel with ultra-low concentration

Abstract

The invention discloses a burning method of gas fuel with ultra-low concentration. A fluidized reactor is adopted as a burner; a mixture of sand grains and catalyst particles is arranged on a grid plate of the burner; the sand grains are quartz sand grains with the grain size of 0.1 to 10mm; and the catalyst particles are Pa / Al2O3 and Pt / Al2O3. The method comprises the steps of: introducing combustible gas and combustion air with ultra-low concentration respectively into a heat exchanger to exchange heat; then introducing the combustible gas and the combustion air with the ultra-low concentration after the heat exchange into a mixed cavity of the fluidized reactor to mix; enabling the mixed gas to enter a burning cavity of the burner by the grid plate to burn; and using the burned gas as a heat source of the heat exchanger. The method is used for the reliable firing and the stable burning of the gas fuel with the ultra-low concentration. Under the catalysis of catalysts, when the concentration of combustible components in the mixed gas is higher than 1%, the burning is maintained. Therefore, the method is suitable for the burning of the gas fuel with the ultra-low concentration.

Description

technical field [0001] The invention relates to a combustion method of low-concentration combustible gas, in particular to a method for combusting ultra-low-concentration combustible gas by using a fluidized reactor. Background technique [0002] In the process of chemical industry, petroleum industry, iron and steel industry and coal mining, a large amount of waste gas containing methane is produced. The methane concentration in the exhaust gas is often below 5%, or even below 1%. Those with methane concentration lower than 5% are ultra-low concentration flammable fuels. However, due to the low concentration of methane and large concentration changes, it is difficult to ignite or maintain stable combustion of ultra-low concentration gaseous fuels. At present, almost all ultra-low-concentration gaseous fuels are directly discharged into the atmosphere without recycling. On the one hand, it causes a serious waste of limited non-renewable resources; on the other hand, it exa...

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