Mine ventilation counter flow oxidation thermo-electric generation system

Abstract

The invention provides a thermoelectric generation system through countercurrent oxidation of mine ventilation air, which belongs to the technical field of performing efficient temperature-difference thermoelectric conversion by utilizing countercurrent oxidation of methane in mine ventilation air to release heat. Gas containing methane extremely low in concentration can be subjected to self-sustained periodic reciprocating-flowing oxidation in a countercurrent oxidation bed of the system so as to form a middle high-temperature region of which the temperature is far higher than a theoretic adiabatic combustion temperature; the hot end of a thermoelectric generation unit is in contact with an inner insulating board in the region; and the cold end of the thermoelectric generation unit is in contact with an outer insulating board connected with a heat exchanger. As a great temperature gradient is produced between the hot end and the cold end of the thermoelectric generation unit, efficient thermoelectric-conversion power generation can be performed with no complex steam cycle or power generation system, and the temperature-difference thermoelectric conversion efficiency of the thermoelectric generation system is obviously higher than conventional thermoelectric generators. The thermoelectric generation system is characterized by simple equipment, compact structure, low cost and high efficiency, and efficiently provides an effective method and equipment choice for controlling and utilizing mine ventilation air.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency temperature-difference thermoelectric conversion by using methane countercurrent oxidation to release heat in mine exhaust air. Background technique [0002] When coal mines drain gas with low methane content, the method of "wind exhaust" is used to inject air into the mine and mix with the gas to discharge the mine. This part of the gas is called "mine exhaust air". Since the methane content in mine exhaust air is generally less than 1%, it is difficult to be utilized by conventional combustion technologies, and most of it is directly discharged into the atmosphere. my country is a big coal country. According to statistics, the exhaust air in mines emptied every year is converted into pure methane with 10-15×10 9 m 3 , and the 12×10 of the West-East Gas Pipeline 9 m 3 The amount of natural gas is equivalent, resulting in a large waste of energy. In addition, exhausting mine ventilati...

AI Technical Summary

Problems solved by technology

However, when the countercurrent oxidation reaction system recycles the heat released by the combustion of mine exhaust air, especially to convert it into high-quality electric energy, the traditional steam cycle and power generation system must be used, which makes the structure of the entire countercurrent oxidation reaction power generation system complex. Huge size, expensive core equipment, large investment in application projects and low returns, so it has not been widely promoted and applied so far

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