Ozone combined photo-excited peroxide VOCs (volatile organic chemicals) purification system and method

Abstract

The invention relates to an ozone combined photo-excited peroxide VOCs (volatile organic chemicals) purification system and method, and belongs to the field of atmospheric pollutant control. The purification system mainly comprises a dust collector, a cooler, a photochemical atomization bed reactor, a gas distribution nozzle, a circulating pump, a particulate matter filtering device, a charging tower, a spray pipeline, a main flue, a demister and a product post-processing system. VOCs from a discharging source are firstly pre-oxidized into organic intermediate by the ozone in a flue, ultraviolet light excites peroxide to generate sulfate radical and hydroxyl free radical, so that the VOCs and the organic intermediate generated by oxidization of the ozone are further oxidized, and final decomposition products are harmless CO2 and harmless H2O. The VOCs in flue gas can be efficiently removed, secondary pollution is avoided in the removing process, and the novel VOCs purification system has a wide application prospect.

Description

technical field [0001] The invention relates to a system and method for purifying volatile organic compounds (Volatile Organic Compounds, VOCs) using ozone combined with light-excited peroxide, belonging to the field of air pollutant control. Background technique [0002] VOCs is the English abbreviation of Volatile Organic Compounds (Volatile Organic Compounds). After entering the human body through the respiratory tract and skin, VOCs can cause temporary and permanent lesions to human breathing, blood, liver and other organs. Various organic waste gases are produced in industrial production, mainly including various hydrocarbons, alcohols, aldehydes, acids, ketones and amines, etc. These organic waste gases will cause air pollution and endanger human health. [0003] With the rapid development of the economy and the improvement of people's awareness of environmental protection, the problem of VOCs removal in exhaust gas has attracted more and more attention. At the same t...

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Problems solved by technology

[0008] The catalytic combustion method is to convert the exhaust gas into harmless and odorless carbon dioxide and water through catalytic combustion. This method has low ignition temperature, energy saving, high purification rate, convenient operation, small footprint, and is suitable for high temperature or high concentration. Organic waste gas, but the catalyst is easily poisoned and deactivated, and the stability is poor. For example, the patent (ZL201410007192.9) proposes a preparation method of a molecular sieve / titanium dioxide-supported copper-manganese-cerium catalyst that can effectively remove VOCs and the corresponding removal process, but this The catalyst preparation method proposed in the patent application is very complicated, the stability of the absorbent is not high, and regular regeneration and activation are required

[0009] The removal efficiency of the activated carbon adsorption method can reach 95%, the equipment is simple, and the investment is small, but the activated carbon is replaced frequently, which increases the working procedures of loading, unloading, transportation, and replacement, resulting in increased operating costs

[0010] The patent (ZL 201410247572.X) proposes a VOCs removal method and process that combines adsorption, condensation and membrane separation, but the method is complicated in process and high in application cost, especially the membrane separation technology at the tail is unstable and difficult to industrialize. application

[0011] The patent (ZL201210263021.3) proposes a VOCs removal method and process based on adsorption, desorption, rectification and pervaporation separation, but this method also has the disadvantages of complex process and high application cost

[0012] Therefore, so far, although a variety of VOCs removal technologies have been developed and utilized, each technology has almost limited application range and many disadvantages.

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