Preheat type catalytic combustion system for purifying volatile organic waste gas

Abstract

The invention relates to a preheat type catalytic combustion system for purifying volatile organic waste gas. The preheat type catalytic combustion system comprises a waste gas inlet, a dry filter, an active carbon adsorption device, heat exchangers, a catalytic combustion device, an air inlet, an air supplement port, a sampling port, temperature detectors, a fan and exhaust funnels. A gas collecting port is used for collecting the volatile organic waste gas, the volatile organic waste gas is filtered through the dry filter and then enters the active carbon adsorption device, and the standard waste gas is exhausted at a high altitude through the exhaust funnels by means of the exhaust fan after adsorption and purification. After the catalytic combustion system is preheated, volatile organic compounds adsorbed by active carbon are subjected to heating and desorption through hot air and then conveyed to a catalytic combustion chamber to be subjected to low-temperature catalytic oxidation decomposition, and the volatile organic compounds are decomposed into harmless substance such as CO2 and H2O after sufficient combustion and then exhausted at a high altitude. The system has the advantages that sufficient combustion of the volatile organic waste gas can be guaranteed, and concentration exceeding emission in the initial starting period is avoided; the concentration of the organic waste gas entering the catalytic combustion device can be controlled; potential safety hazards caused by excessively-high temperature of the active carbon adsorption device can be prevented.

Description

technical field [0001] The application relates to a preheating catalytic combustion system (or device) and method for purifying volatile organic waste gas, which belongs to the field of organic waste gas pollution control. 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. VOCs are a kind of commonly used reagents in the petrochemical industry, spray painting industry, paint production and processing industry, rubber production and processing industry, printing and dyeing industry, etc. The resulting VOCs exhaust gas usually has complex components and large changes in emission concentration. , not easily soluble in water, containing acid or alkali c...

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional treatment methods for VOCs are: condensation method, which is mainly used to recover single-component gases with high concentration, high boiling point, and small gas volume, and has a low recovery rate of waste gas from complex components; absorption method, which is mainly used for large-scale, high-concentration gas , soluble waste gas, but the treatment efficiency of poorly soluble waste gas is low; the activated carbon adsorption method is suitable for low-concentration and large-volume VOCs waste gas. Activated carbon is easy to adsorb and saturate, and the cost of replacing the adsorbent is expensive. As a kind of hazardous waste treatment; combustion method, mainly for organic waste gas with high concentration and complex components, this method has simple process and high removal efficiency

[0004] The traditional device for desorption and combustion combin

Images