Combustion of ultra-low concentration combustible gas and its thermal energy step utilization system

Abstract

The invention relates to a system for the combustion and the heat energy cascade utilization of combustible gas with ultra low concentration. A magnet valve and a pipeline are formed into a gas circuit with periodically changed air flow direction, to be connected with a combustion chamber internally provided with heat storage medium and a heat exchanger; the heat transmission is realized between the gas and the heat storage medium and the heat exchanger. When the heat storage medium loads different catalyzer, lower initiation temperature can be realized; when the amount of the heat storage medium is sufficient, higher gas preheating temperature can be realized; through changing the amount of the catalyzer and the heat storage medium, higher operating temperature and lower combustion concentration limit can be realized, and through changing the category of the catalyzer and the commutation cycle of the magnet valve, better gas adaptability and load adjustment can be realized. Through the heat exchange of the working medium in the internal heat exchanger and the high-temperature gas after being burnt or through the high-temperature flue gas after the system is reacted, the utilization of the high grade heat energy can be realized; through reducing the exhaust fume temperature of the final product, the utilization of the low grade heat energy can be realized.

Description

technical field [0001] The invention belongs to the technical field of combustion equipment, and in particular relates to the combustion of coal mine ventilation gas and its thermal energy cascade utilization system. Background technique [0002] Gas is the biggest safety hazard in coal mining. It is a mixture of various gases based on methane (CH4); among them, gas with a methane concentration of 85% has a calorific value of 34.6MJ / m3. According to statistics, the death rate per million tons of coal in my country was about 3 in 2004, which is more than 100 times that of the United States and more than 10 times that of India. More than 95% of them died in accidents caused by gas explosions, which caused huge losses to the normal production of coal mines. [0003] In the mining of coal mines, in order to prevent gas explosion, the method of ventilation and dilution is usually adopted to control the concentration of gas below 1%. This part of gas is called ventilation gas. V...

AI Technical Summary

Problems solved by technology

It is not suitable for ultra-low concentration combustible gases that cannot be ignited and burned

[0011] Although the structure of the methane oxidation device for coal mine exhaust air invented by Chen Yiliang and others is similar to that of the present invention, its principle is based on the traditional oxidation reaction, which is different from the catalytic reaction of the present invention.

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