Treatment method for normal-temperature catalytic ignition of VOCs for self sustaining combustion

Abstract

The invention relates to a treatment method for normal-temperature catalytic ignition of VOCs for self sustaining combustion in the technical field of waste gas treatment. The treatment method can include the following steps that in the catalytic ignition stage, under the normal temperature and normal pressure, when the temperature of a catalytic bed in a reactor containing a doping type preciousmetal composite oxide catalyst is 30 DEG C to 45 DEG C, VOCs waste gas and H2 are led into the reactor, then air is led, and catalytic ignition of the VOCs waste gas is achieved; and the catalytic self sustaining stage is conducted, H2 is stopped being led in, the feeding flow of the VOCs waste gas is adjusted, the volume flow of the air which is led in is adjusted to 5-30 times of that of VOCs, the reaction is carried out, and the self sustaining combustion reaction of the VOCs waste gas is developed. The method is suitable for treating VOCs waste gas containing a certain amount of unsaturated hydrocarbon, the VOCs waste gas can be treated together with one or more of nitrogen-containing oxide, amine-containing gas and oxygen-containing organic matter gas at the same time. By means of themethod, the VOCs waste gas is ignited under the condition that external auxiliary heating energy is not needed, self sustaining combustion is achieved, the technology is simple, and the environment is better protected.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, and more particularly, relates to a treatment method for self-sustained combustion of VOCs catalyzed and ignited at room temperature. Background technique [0002] Common VOCs purification technologies include condensation method, adsorption method, absorption method, catalytic method, biological method, etc., and these methods are widely used. Among them, the catalytic method is to heat VOCs to the light-off temperature (200-450°C) to realize the catalytic and non-catalytic combustion reactions of VOCs to generate carbon dioxide and water. [0003] Patent CN106979526A provides a low-temperature plasma rapid ignition method for catalytic self-sustained combustion of VOCs at normal temperature and pressure. By placing a catalyst in the discharge area of ​​the plasma reactor, the gas discharge generates a low-temperature plasma after applying a voltage, and the reactor passes through t...

AI Technical Summary

Problems solved by technology

[0004] However, petrochemical small-scale and pilot-scale test devices produce VOCs containing a certain amount of low unsaturated hydrocarbons, nitrogen oxides, amine-containing gases, and oxygen-containing organic waste gases. The total amount is small and scattered, lacking economic benefits for recycling and comprehensive utilization. It is relatively difficult, and at the same time, the treatment of this kind of exhaust gas often fails to attract enough attention

So far, there is still a lack of catalytic combustion technology for this kind of VOCs exhaust gas at home and abroad, which is considered to have relatively high economic value.

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