Method for distributing intake airflow and exhaust airflow of coal mine methane device

Abstract

The invention provides a method for distributing intake airflow and exhaust airflow of a coal mine methane device. The device comprises an intake and exhaust change valve of an oxidation device, an oxidation bed, a right air duct and a left air duct, wherein a divide board and an airflow regulation mechanism are arranged in the right air duct and the left air duct which enter into the oxidation bed, the methane is separated in the horizontal direction and the vertical direction, so that the methane concentration and uniform intake and exhaust of airflow can be maintained in the oxidation bed, methane drifting and temperature field drifting in the oxidation bed can be prevented after the methane is heated in the oxidation device, and constant and stable operation of the oxidation device can be effectively maintained. The invention has the advantages of separating the air ducts with large space dimension of the oxidation device into a plurality of small circulating units in the horizontal direction and the vertical direction along with uniform methane concentration, uniform oxidation and uniform temperature field, automatically maintaining continuous operation of the oxidation device under a condition of lower methane concentration, reducing interactive interference between gases in gas intake and exhaust processes, reducing flow resistance, reducing power consumption of a methane delivery fan and the like, and is mainly applied to coal mine methane oxidation process devices.

Description

1. Technical field [0001] The invention relates to a process method for stabilizing operation of a large-scale exhaust air oxidation device in a coal mine and preventing stratification of methane and air in the exhaust air, and in particular to a method for distributing the air intake and exhaust airflow of the coal mine exhaust air oxidation device. 2. Background technology [0002] At present, the existing coal mine exhaust air oxidation device, the small device can self-sustain operation in the laboratory state or the coal mine site, and the stability is good. But for the exhaust air flow rate is large, such as a coal mine air shaft flow rate of about 5000 ~ 10000m 3 / min coal mine, the exhaust air oxidation treatment capacity is generally not less than 500m 3 / min, a large-scale oxidation device that can be used industrially and commercially on site, has made a contribution to the oxidation treatment of coal mine exhaust air, but it also has the following shortcomings o...

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Problems solved by technology

But for the exhaust air flow rate is large, such as a coal mine air shaft flow rate of about 5000 ~ 10000m 3 / min coal mine, the exhaust air oxidation treatment capacity is generally not less than 500m 3 / min, a large-scale oxidation device that can be used industrially and commercially on site, has made a contribution to the oxidation treatment of coal mine exhaust air, but it also has the following shortcomings or deficiencies: ①The oxidation device of this specification has a large space size After the exhaust air enters the oxidation device, the regenerative body along the way preheats the exhaust air. Due to the large molecular weight difference between methane and air (mainly oxygen and nitrogen), methane drifts upward rapidly under the heated state, causing it to enter the oxidation device. The concentration of exhaust air in the high temperature oxidation area is uneven, the concentration of methane in the upper part becomes higher, and the concentration of methane in the lower part becomes lower; The methane in the oxidizer is not oxidized, but the air flow in the lower part still takes away the heat inside the oxidation device, so that the lower part of the oxidation device loses the temperature field that should be possessed by the air-free oxidation; ③ As time goes by, the non-oxidized area inside the oxidation device expands upwards, and the oxidation ④ Due to the large flow rate of the exhaust air, in order to save energy consumption, the exhaust air enters the oxidation device in the form of "low pressure and large flow". In this state, the exhaust air entering the oxidation device is oxidizing The uneven distribution inside the device makes the workload of each area of ​​the oxidation device uneven and reduces the processing capacity of the oxidation device; The increase in wind power consumption of the device makes it difficult to popularize and apply the exhaust air oxidation project

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