Energy saving method for catalytic oxidation treatment of large-flow VOCs gases

Abstract

The invention discloses an energy saving method for catalytic oxidation treatment of large-flow VOCs gases. The energy saving method comprises the following steps: heating air by adopting steam, mixing the large-flow VOCs gases with the heated hot air so as to obtain a mixed gas, and controlling the concentration of the VOCs gases in the mixed gas to be lower than the lowest limit of explosion; conveying the mixed gas into a catalytic reactor for catalytic oxidative reaction, carrying out waste heat recovery when exhaust gas after reaction enters an exhaust gas heat exchanger to be subjected to heat exchange with the mixed gas to enter the catalytic reactor, and discharging the up-to-standard gas after waste heat recovery through a high-altitude blow-down pipe. The energy saving method for catalytic oxidation treatment of large-flow VOCs can adapt to organic exhaust gas treatment working conditions including high target, high treatment capacity and complex composition, and is safe, low in energy consumption, simple in technological process and capable of cyclically utilizing a heating medium; besides, steam can be utilized to provide heat so as to reduce the requirement on power supply load especially when the local power supply load is relatively low; moreover, the energy saving method can also be used in combination with other exhaust gas recovery devices so as to improve the emission index.

Description

technical field [0001] The field of the present invention relates to a large-volume, low-concentration volatile organic compound (VOCs) treatment method, especially a method of preheating air with steam externally, reducing electricity load, and destroying low-concentration volatile organic compounds through low-temperature catalytic oxidation. Background technique [0002] The current treatment technologies for volatile organic compounds (VOCs) mainly include the following methods: condensation recovery technology, absorption recovery technology, membrane recovery technology, adsorption recovery technology, and catalytic combustion technology. [0003] However, in the case of volatile organic compounds (VOCs) with large gas volume, low concentration, and unstable gas volume, the above-mentioned technologies have various defects, and it is difficult to meet GB31570 "Petroleum Refining Industry Pollutant Discharge Standard", GB31571 "Petrochemical Industry Industrial Pollutan...

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Problems solved by technology

[0005] In view of the existing large flow and low concentration of exhaust gas, the electric heating power in the catalytic combustion technology is too high, the energy consumption is too large, and there are potential safety hazards (because the working temperature of the catalyst is higher than the light-off temperature of most organic substances, there is a potential explosion hazard ) and other shortcomings, the present invention provides an energy-saving method for catalytic oxidation treatment of large flow VOCs gas

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