Coal mine ventilation air methane preheating catalytic oxidation device with hot air recirculation function

Abstract

The invention relates to a coal mine ventilation air methane preheating catalytic oxidation device with a hot air recirculation function, comprising a ventilation air methane feeding system, a reaction chamber, a preheater, a hot air connection pipe and a hot air expanding pipe. The ventilation air methane feeding system is communicated with the ventilation air methane inlet of the preheater; the ventilation air methane outlet of the preheater is communicated with the inlet of the reaction chamber through the hot air connection pipe; the smoke inlet of the preheater is communicated with the outlet of the reaction chamber through a transition pipe, and the smoke outlet is communicated with the atmosphere; and the reaction chamber is internally provided with an electric heating wire and a catalyst-ceramic layer. The coal mine ventilation air methane preheating catalytic oxidation device with the hot air recirculation function is characterized by additionally comprising a hot air recirculation control system, wherein the hot air recirculation control system comprises a circulation pipe with a recirculation fan and a recirculation valve, one end of the circulation pipe is communicated with the transition pipe, and the other end is communicated with the hot air connection pipe. The coal mine ventilation air methane preheating catalytic oxidation device with the hot air recirculation function has the advantages of compact structure, low energy consumption, high reliability, quick start due to heating and high heat recovery efficiency.

Description

technical field [0001] The invention provides a coal mine exhaust air preheating catalytic oxidizer with hot air recirculation, 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 over a 100-year period is 19 times that of carbon dioxide, and methane accounts for 15% of global warming share, second only to carbon dioxide. At present, my country's coal mines emit as much as 18 billion Nm of methane into the...

AI Technical Summary

Problems solved by technology

However, since the hot gas after exhaust air oxidation is only recovered by the preheater, the efficiency of heat recovery is low, and the heat loss of exhaust gas is high, which needs further improvement

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