Heat energy after decomposition of organic waste gas is exchanged with cold gas flow of waste gas to replace heat energy and increase the temperature of thermal desorption bed. When the concentration of waste gas reaches a certain value, the heat exchanger can ensure the normal operation of the equipment without running power, which is the first temperature raising device for waste gas source in the catalytic purification device. By controlling the air flow through the heat exchanger, high exchange efficiency can be ensured.
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