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Gas flow reverse control method of ventilation air methane thermal oxidation device of coal mine

A control method and wind gas technology, which are applied in chemical instruments and methods, combustion methods, separation methods, etc., can solve problems such as unstable operation of oxidation devices, and achieve the effects of improving automatic operation stability and high methane oxidation rate.

Inactive Publication Date: 2012-11-21
SHANDONG UNIV OF TECH
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Problems solved by technology

The disadvantage of this control method is that the external flow field at both ends of the oxidation bed and the flow field inside the oxidation bed are difficult to achieve complete symmetry. And gradually deviate from the center of the oxidation bed, resulting in unstable operation of the oxidation device

Method used

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  • Gas flow reverse control method of ventilation air methane thermal oxidation device of coal mine
  • Gas flow reverse control method of ventilation air methane thermal oxidation device of coal mine
  • Gas flow reverse control method of ventilation air methane thermal oxidation device of coal mine

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Embodiment Construction

[0029] Such as figure 1 As shown, seven thermocouples 2 are evenly arranged along the airflow direction in the central area of ​​the oxidation bed 4, and one thermocouple 2 is arranged at the inlet and outlet 3 at both ends of the oxidation bed 4, and the programmable controller 5 is based on the data collected by the above thermocouple 2 , calculate the length of the area with a temperature ≥ 900°C in the central area of ​​the oxidation bed 4, the line heat storage in the central area of ​​the oxidation bed 4, and the gas temperature difference between the two inlets and outlets of the oxidation bed 4, and judge whether to reverse the direction according to the calculation results. If it is necessary to reverse the direction , the programmable controller 5 outputs a signal to the reversing valve 1 to switch the gas flow direction.

[0030] Such as figure 2 As shown, the airflow reversing control method of the coal mine exhaust air gas thermal oxidation device includes the f...

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Abstract

The invention discloses a gas flow reverse control method of the ventilation air methane thermal oxidation device of coal mines, belonging to the technical field of ultra-low concentration methane hot reverse flow oxidation. The gas flow reverse control method is characterized in that programmable controllers use data acquired by a plurality of thermoelectric couples which are uniformly distributed along the direction of gas flow in a central area of an oxidation bed and the data of two thermoelectric couples which are distributed at an inlet and an outlet of the two ends of the oxidation bedto calculate the area length of the temperature of more than or equal to 900 DEG C in the central area of the oxidation bed according to a formula: Sigma xilT is more than or equal to 900 DEG C, calculate the line heat storage capacity of the central area of the oxidation bed according to the formula, calculate the temperature difference of gas of the inlet and the outlet of the oxidation bed, and judge whether the direction is reversed according to the calculated result, and if needed, the programmable controller outputs signals to a reversing valve and switches the direction of gas flow. Compared with the prior art, the gas flow reverse control method changes the original fixed period gas flow reversing into dynamic gas flow reversing, improves methane oxidation rate and automatic operating stability of an oxidation device and reduces the energy taken away by exhausted gas of the oxidation device.

Description

technical field [0001] The invention relates to a gas flow reversing control method of a coal mine exhaust air gas thermal oxidation device, and belongs to the technical field of ultra-low concentration methane thermal countercurrent oxidation. Background technique [0002] The main component of gas is methane. In order to improve the safety of coal mine production, the gas is generally discharged directly into the atmosphere through the exhaust air of the coal mine, which not only wastes energy, but also pollutes the atmospheric environment. The gas concentration in coal mine exhaust air is very low, generally in the range of 0.1%-0.7%. It is difficult to use traditional burners to directly burn the exhaust air gas without auxiliary fuel. The current effective utilization method is thermal countercurrent oxidation technology. Its working principle is as follows: firstly, use an electric heater or an external burner to heat the middle part of the regenerative ceramic oxida...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76F23G7/06
Inventor 刘永启刘瑞祥高振强王延遐郑斌孟建尤彦彦
Owner SHANDONG UNIV OF TECH
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