Coal mine methane preheating catalytic oxidation device with multiple reaction chambers

Abstract

The invention relates to a coal mine methane preheating catalytic oxidation device with multiple reaction chambers and belongs to technical field of ultralow-concentration methane oxidation. The device comprises a coal mine methane supply system, a pre-heater, even reaction chambers, a suction system, an exhaust system, an exhaust heating system and a measuring and controlling system, wherein an electric heater, a temperature-equalizing and flow-equalizing bed and a catalytic oxidation bed are arranged in each reaction chamber. After starting to heat, the coal mine methane is heated after entering into the pre-heater through the coal mine methane supply system; and then the coal mine methane is supplied to each reaction chamber through the suction system; carbon dioxide and water are oxidized in the catalytic oxidation bed of the reaction chamber; after the reacted heat gas is converged by the exhaust system, one part of the heat gas is used for utilizing the heat; and the residual heat gas enters into the pre-heater and transfers the heat to the fresh coal mine methane, and the residual heat gas is lastly discharged into the atmosphere after being cooled. The coal mine methane preheating catalytic oxidation device with multiple reaction chambers has the advantages of compact structure, low power consumption, simpleness in running, high reliability, and the like.

Description

technical field [0001] The invention relates to a multi-reaction chamber coal mine exhaust air preheating catalytic oxidizer, which belongs to the technical field of ultra-low concentration methane oxidation. Background technique [0002] The main component of coal mine gas is methane, a greenhouse gas whose greenhouse effect is 21 times that of carbon dioxide. In recent years, my country's annual methane emission through coal mine ventilation is more than 15 billion Nm 3 . If this exhaust gas is utilized, it is equivalent to about 23 million tons of standard coal, which can reduce 200 million tons of carbon dioxide equivalent. The concentration of exhaust gas in coal mines is very low, and it is difficult to use traditional burners for direct combustion. The current effective utilization methods are Thermal Flow Reversal Reactor (TFRR for short) and Catalytic Flow Reversal (CFRR for short). . The basic working principle and structure of these two countercurrent oxidatio...

AI Technical Summary

Problems solved by technology

However, from the perspective of practical application, only the thermal countercurrent reaction technology has been successfully applied commercially in the coal mine field.

However, the use of TFRR technology to treat coal mine exhaust gas still has the following problems: (1) TFRR occupies a relatively large area, for example, the TFRR unit of MEGTEC Company needs to process 150m 3 / s gas, the device covers an area of ​​about (63×14.62×4.49) m; (2) The oxidation bed of TFRR is composed of a large number of honeycomb ceramics, and the honeycomb ceramics will crack, break and block after long-term use , Generally speaking, the honeycomb ceramics need to be replaced once a year, and the maintenance cost is too high; (3) The resistance loss of TFRR is very large, generally above 8000KPa, and the energy consumption of the fan is very high; (4) The airflow in the oxidation bed of TFRR needs to be constantly Change the direction to ensure that the high temperature area is maintained in the middle of the oxidation bed, which requires a high degree of automatic control and high operating technology requirements

These main problems increase the difficulty of popularization and application of TFRR technology

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