Method for reclaiming heat of ventilated gas oxidation device

Abstract

The invention discloses a method for reclaiming heat of a ventilated gas oxidation device, which belongs to the technical field of coal mine gas administration and emission reduction. The device comprises an air exhaust cavity, a low-temperature stage ceramic heat storage material (8), a high-temperature stage ceramic heat storage material (10), a high-temperature three-way valve (12) and a wasteheat boiler (13). The air exhaust cavity is connected with the waste heat boiler (13) through the high-temperature three-way valve (12); partial high-temperature smoke accounting for 100 to 40 percent of the total flow is discharged into the atmosphere through the low-temperature stage ceramic heat storage material (8) and a smoke discharge pipeline (4), and the heat of the smoke is used for pre-heating ventilated gas; and the rest smoke accounting for 0 to 60 percent of the total flow, at the temperature of between 450 and 750 DEG C, enters the waste heat boiler (13) through the high-temperature three-way valve (12) to perform heat reclamation, and then is discharged into the atmosphere through a boiler smoke discharge draught fan (15). The heat reclaiming method of the invention has theadvantages of strong methane concentration adaptability of the ventilated gas, high heat exchange efficiency, low self-maintaining concentration, convenient maintenance and the like.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas control and emission reduction, and in particular relates to a heat energy recovery method of a coal mine ventilation gas thermal storage oxidation device, which can recover heat energy without affecting the operation of the ventilation gas oxidation device, and can produce superheated steam, saturated steam or hot water. Background technique [0002] The previous ventilated gas regenerative oxidation device was not equipped with heat energy recovery equipment, and the heat generated after methane oxidation was discharged into the atmosphere along with the flue gas, resulting in a large amount of waste of energy. At present, some ventilated gas regenerative oxidation devices are beginning to be equipped with heat energy recovery equipment. The specific method is to arrange the heating surface of the heat exchanger used for heat recovery inside the ceramic heat storage material. Although the...

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Problems solved by technology

[0003] The object of the present invention is to provide a high-efficiency heat energy recovery method for a ventilation gas oxidation device, which can not only keep the heat recovery rate of the ventilation gas oxidation device over 95%, the methane decomposition efficiency higher than 95%, and the continuous and stable operation of the oxidation device, but also solve the problem of Problems existing in the existing ventilated gas oxidation device, such as poor adaptability of heating surface layout to methane concentration, low heat transfer efficiency of heating surface, high self-maintaining concentration of oxidation device, poor economy, complex structure and difficult maintenance of heating surface, etc.

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