Coal mine ventilation air methane back-heating catalytic oxidation device with combined type oxidation bed

Abstract

The invention relates to a coal mine ventilation air methane back-heating catalytic oxidation device with a combined type oxidation bed. The coal mine ventilation air methane back-heating catalytic oxidation device with the combined type oxidation bed comprises a ventilation air methane inlet system, a ventilation air methane exhaust system, a back-heating system and a reaction chamber, wherein the ventilation air methane inlet system is communicated with the inlet of the reaction chamber, and the ventilation air methane exhaust system is communicated with the outlet of the reaction chamber; one end of the back-heating system is communicated with a ventilation air methane outlet pipe, and the other end of the back-heating system is communicated with a ventilation air methane inlet pipe; an electric heating wire and the combined type oxidation bed are sequentially arranged in the reaction chamber along an air flow direction. The coal mine ventilation air methane back-heating catalytic oxidation device with the combined type oxidation bed is characterized in that the combined type oxidation bed comprises multiple catalytic oxidation layers which are formed by the filling of honeycomb type catalysts, the catalysts adopted in the catalytic oxidation layers close to the electric heating have high active component loading capacity, large specific surface areas and high cell density, and the active component loading capacity, the specific surface areas and the cell density of the catalysts adopted in the other catalytic oxidation layers are reduced along the airflow direction in a stepped manner. The coal mine ventilation air methane back-heating catalytic oxidation device with the combined type oxidation bed has the advantages of low ignition temperature, high oxidation efficiency, good operation stability and the like.

Description

technical field [0001] The invention provides a coal mine exhaust air recovery heat catalytic oxidation device with a combined oxidation bed, which belongs to the technical field of ultra-low concentration methane oxidation. Background technique [0002] The main component of coal mine gas is methane, which is a gas energy that can be utilized. However, in order to improve the safety of coal mine production, a large amount of ventilation is usually used to dilute the gas and discharge it directly into the atmosphere. On the one hand, the direct emission of exhaust gas from coal mines has caused a huge waste of limited non-renewable resources, and on the other hand, it has also exacerbated air pollution and the greenhouse effect: the greenhouse effect of methane in 100 years is 21 times that of carbon dioxide, and methane accounts for 17% of global warming share, second only to carbon dioxide. At present, my country's coal mines emit as much as 20 billion Nm of methane into...

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Problems solved by technology

However, the catalyst ceramic layer of this oxidation device is only filled with a single catalyst, which has problems such as high light-off temperature, low oxidation efficiency, and poor operation stability, and needs to be further improved.

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