Adsorption concentration-preheating catalytic combustion system and purification method for purifying paint exhaust gas from automobiles and related fields

Abstract

The invention relates to an adsorption concentration-preheating type catalytic combustion system for purifying automobiles and coating exhaust gas in related fields and a purifying method thereof. The adsorption concentration-preheating type catalytic combustion system comprises an exhaust gas inlet, a wet-type filter, an activated carbon adsorption device, a heat exchanger, a catalytic combustion device, an air inlet, an air supplement port, a sampling port, a temperature detector, an on-line monitor, a frequency conversion draught fan and an exhaust funnel. A gas collecting port collects volatile organic exhaust gas, the volatile organic exhaust gas enters the activated carbon adsorption device after being filtered by the wet-type filter, and exhaust gas obtained after adsorption purification reaches the standard and is discharged by an exhaust blower to high altitude through the exhaust funnel; after the catalytic combustion system is preheated, volatile organic compounds adsorbed by the activated carbon are heated by hot air and desorbed and then are conveyed to a catalytic combustor for low-temperature catalytic oxygenolysis; after sufficient burning, the organic compounds are decomposed into harmless CO2, H2O and other matter to be discharged to high altitude.

Description

technical field [0001] The application relates to an adsorption concentration-preheating catalytic combustion system (or device) and method for purifying paint exhaust gas from automobiles and related fields, which belongs to the field of organic waste gas pollution control with large air volume, low concentration and multi-components. Background technique [0002] Volatile organic compounds (Volatile organic compounds, VOCs) usually refer to organic compounds with a saturated vapor pressure greater than 133Pa at 25°C, and their main components are hydrocarbons, halogenated hydrocarbons, oxygen hydrocarbons, sulfur hydrocarbons, nitrogen hydrocarbons , aromatic hydrocarbons and polycyclic aromatic hydrocarbons. [0003] In the painting section of automobiles and related fields, the exhaust gas from the spray booth, drying room, paint mixing room, and finish paint sewage treatment room is a low-concentration, high-flow room-temperature exhaust gas with complex components, and...

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Problems solved by technology

[0005] Adsorption concentration + desorption regeneration + catalytic combustion method combined with the traditional device for treating VOCs exhaust gas has two operation modes: (1) direct exhaust type, which directly transports the desorbed organic waste gas to the heat exchanger and catalytic combustion chamber for combustion and degradation , the disadvantage of this method is that due to the low temperature of the catalytic combustion chamber at the beginning of the system start-up, some organic waste gas will generate harmful intermediate products due to incomplete combustion, or be directly discharged without combustion; (2) Internal circulation type, after desorption After combustion, the organic waste gas circulates into the activated carbon adsorption device as desorption gas for desorption. The disadvantage of this method is that the circulating gas may cause the concentration of organic waste gas inside the activated carbon adsorption device to be too high, resulting in safety hazards such as explosions.

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