Air extracting and heating coal mine ventilating gas thermal oxidizer unit

Abstract

The invention relates to an air extracting and heating coal mine ventilating gas thermal oxidizer unit which belongs to the technical field of ultralow-concentration methane flow reversal oxidization and low-density energy recycling. The air extracting and heating coal mine ventilating gas thermal oxidizer unit comprises an oxidizing bed, a support mesh, a heater, a ventilating gas inlet pipe, an upper air collecting box, a lower air collecting box, four reversing valves, a waste gas outlet pipe, an air extracting and heating system and an electric control unit, wherein the air extracting and heating system comprises air extracting main pipes, air extracting branch pipes, two air extracting valves, a hot air collecting pipe, a flow regulating valve and a hot air outlet pipe; and two groups of air extracting main pipes and air extracting branch pipes are symmetrically arranged at the upper side and the lower side of a central area in the oxidizing bed respectively. Coal mine ventilating gas enters the oxidizing bed by controlling the opening and closing of the reversing valves and the air extracting valves under the control of the electric control unit, fully oxidizes methane in the oxidizing bed and extracts partially oxidized hot gas parts for carrying out heat utilization. The invention has the advantages of high methane oxidization rate, easy regulation of extracted heat, stable running of the oxidizer unit, low manufacture cost, and the like.

Description

Technical field [0001] The invention relates to a coal mine exhaust air gas thermal oxidation device for extracting gas and heat, and belongs to the technical field of ultra-low concentration methane thermal countercurrent oxidation and low-density energy recovery. Background technique [0002] The main component of coal mine gas is methane, which is both a gas energy and a greenhouse gas. Except for partial extraction, most of the gas is directly discharged into the atmosphere through the coal mine ventilation system, causing energy waste and atmospheric environmental pollution. The thermal flow-reversal reactor (TFRR) for coal mine exhaust air can oxidize methane in the exhaust air into carbon dioxide and water to achieve emission reduction. [0003] The oxidation of coal mine ventilation gas can release a certain amount of heat. Except for the heat required to maintain the thermal reaction in the oxidation bed, the remaining heat can be recycled. The development of heat extrac...

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Problems solved by technology

However, there are the following unfavorable factors in extracting hot gas at the center of the high temperature zone of the oxidation bed: (1) The complete oxidation of methane requires a certain temperature and time. When the exhausted methane flows to the center of the high temperature zone of the oxidation bed, it may be extracted without complete oxidation Reduced methane oxidation rate; (2) extracting hot gas from the center of the high temperature zone of the oxidation bed will lead to a decrease in the maximum temperature of the oxidation bed

If the control is not good, it will affect the operation stability of the oxidation device; (3) The temperature of the hot gas extracted from the center of the high temperature zone of the oxidation bed is very high, generally higher than 1000 ° C, so the temperature resistance of the extraction system is very high. Increased manufacturing cost of the oxidation unit

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