Preheating and catalytic oxidizing device of coal mine ventilation air methane

Abstract

The invention belongs to the technical field of ultra-low-concentration methane oxidization, and relates to a preheating and catalytic oxidizing device of coal mine ventilation air methane (VAM). The device comprises a VAM delivering system, a preheating device, a reaction chamber, a hot air connecting pipe, an end expanding pipe, a heat collecting system, and a measuring and controlling system. The VAM delivering system is connected to a VAM inlet of the preheating device. A VAM outlet of the preheating device communicates with the reaction chamber through the hot air connecting pipe. An exhaust gas inlet of the preheating device communicates with an outlet of the reaction chamber through a transiting pipe. An exhaust gas outlet of the preheating device communicates with outside atmosphere. In the reaction chamber, along the air flowing direction, the following components are orderly arranged: an electric heating starting device, a temperature and flow homogenizing bed layer, and a catalytic oxidizing bed layer. After the reaction chamber heating is started, the VAM is delivered to the preheating device to be heated. The heated air is oxidized into carbon dioxide and water in thecatalytic oxidation bed layer. One part of the oxidized hot air is collected by the heat collecting system for heat utilization, and the other part is cooled by the preheating device, and then discharged into the atmosphere. The device provided by the present invention has advantages of compact structure, low power consuming, simple operation and high reliability.

Description

technical field [0001] The invention provides a 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, 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 the atmosphere every year. 3 , of which...

AI Technical Summary

Problems solved by technology

However, from the perspective of practical application, there are the following problems in the treatment of coal mine exhaust gas by using TFRR technology: (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, which 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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