Two-stage fluidized bed coal bed gas non-catalytic deoxidation technology

Abstract

The invention provides a two-stage fluidized bed coal bed gas non-catalytic deoxidation technology. The technology comprises that after passing through a heat exchanger, a raw material coal bed gas is introduced into a second fluidized bed reactor from the bottom part of the second fluidized bed reactor to be subjected to a first stage deoxidation reaction with a deoxidizer II, a gas-solid mixture after the deoxidation is introduced into a second gas-solid separator from the top lateral part of the second fluidized bed, and a separated solid is discharged from an ash bucket; a separated primary product gas is introduced into the bottom part of a first fluidized bed to be subjected to a second stage deoxidation reaction with a deoxidizer introduced from the bottom lateral part of the first fluidized bed, a gas-solid mixture after the reaction is introduced into a first gas-solid separator from the top lateral part of the first fluidized bed, and a deoxidation product gas which has an oxygen content less than 1.5% is finally acquired after a separated product gas passes through a heat exchanger, a cooler and a deduster. The deoxidation technology avoids the combustion and cracking reaction of methane and reduces the loss of methane, and at the same time the deoxidizers can be fully used.

Description

technical field [0001] The invention relates to a method for deoxidizing coal bed gas, in particular to a non-catalytic deoxidation process for coal bed gas in a two-stage fluidized bed. Background technique [0002] Coalbed methane belongs to unconventional natural gas, that is, natural gas that is generated during the formation and evolution of coal, has not been migrated, and exists in the coal seam in an adsorbed state. The main component of coalbed methane is methane (CH 4 ), nitrogen and oxygen, is a clean and high calorific value of energy. Since coalbed methane usually does not contain carcinogenic toxic substances such as sulfur, benzene, mercury, and lead, coalbed methane can replace conventional natural gas as a high-calorific value, pollution-free high-quality clean energy, and can be used as fuel for power generation, industrial fuel, and vehicles. Fuel, chemical raw material and residential fuel. Currently, for CH 4 Coalbed methane with a content of more th...

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Problems solved by technology

[0018] The present invention aims at the problems that the existing coalbed methane deoxygenation method uses a fixed bed for deoxidation, and there is heat accumulation that easily generates a high-temperature zone, causing methane to crack, resulting in low methane concentration in product gas and high methane loss rate, etc., and provides a secondary flow Non-catalytic deoxidation process of bed methane

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