Treatment method for catalytically igniting VOCs for self-sustaining combustion at normal temperature

Abstract

The invention relates to the technical field of VOCs-containing waste gas treatment, in particular to a treatment method for catalytically igniting VOCs for self-sustaining combustion at normal temperature. The treatment method comprises the following steps that in a catalytic ignition stage, at normal temperature and normal pressure, when the temperature of a catalyst bed layer in a reactor filled with a doped noble metal composite oxide catalyst is 30-45 DEG C, VOCs waste gas and H<2> are introduced into the reactor, and then air is introduced to enable the VOCs waste gas to be catalyticallyignited and enter a catalytic self-sustaining combustion stage, H<2> introduction is stopped, the feeding flow of the VOCs waste gas is adjusted, the volume flow of introduced air is adjusted, the reaction is developed into the self-sustaining combustion reaction of the VOCs waste gas, and the VOCs waste gas is thoroughly oxidized into carbon dioxide and water and then discharged through an outlet of the reactor. Compared with a traditional VOCs catalytic combustion ignition technology, the method does not need external auxiliary heating, does not need a new ignition device, can be realized at normal temperature, is simple in process and is beneficial to environment protection.

Description

technical field [0001] The present invention relates to the technical field of VOCs-containing waste gas treatment, and furthermore, relates to a treatment method of normal temperature catalytic ignition VOCs self-sustained combustion. 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...

AI Technical Summary

Problems solved by technology

[0004] However, petrochemical small-scale and pilot-scale test devices produce VOCs waste gas containing a certain amount of low unsaturated hydrocarbons. enough attention

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

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