A method for treating self-sustained combustion of VOCs by catalytic ignition at room temperature

Abstract

The invention relates to a treatment method for the self-sustained combustion of VOCs by catalyzing and igniting VOCs at room temperature in the technical field of waste gas treatment. The treatment method may include the following steps: in the catalytic ignition stage, under normal temperature and pressure, when the temperature of the catalyst bed in the reactor equipped with the doped noble metal composite oxide catalyst is 30-45 °C, VOCs waste gas and H 2 Pass into the reactor, and then pass in air to make the VOCs exhaust gas catalytically ignite; enter the catalytic self-sustained combustion stage, and then stop the introduction of H 2 And adjust the feed flow of VOCs waste gas, and adjust the volume flow of incoming air to be 5 to 30 times the volume flow of VOCs, and the reaction develops into a self-sustained combustion reaction of VOCs waste gas. The method is suitable for treating VOCs waste gas containing a certain amount of low unsaturated hydrocarbons, and can simultaneously treat VOCs waste gas and one or more of nitrogen oxide-containing gas, amine-containing gas, and oxygen-containing organic gas. The method ignites the VOCs waste gas and self-sustained combustion without external auxiliary heating energy, the process is simple, and is conducive to protecting the environment.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, and more particularly, 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. These methods are widely used. The catalytic method is to heat the VOCs to the light-off temperature (200-450°C) to realize the catalytic and non-catalytic combustion reactions of the 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, after applying a voltage, the gas discharge generates a low-temperature plasma. The waste gas to be treated containing a certain...

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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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