VOCs treatment process and equipment using heterogeneous catalytic oxidation

Abstract

The invention discloses VOCs treatment process and equipment using heterogeneous catalytic oxidation. The VOCs treatment process is characterized in that O3, H2O2, UV and hydraulic cavitation effects are integrated to allow the oxidant and the oxidation manner to have a synergic effect so as to generate a large amount of hydroxyl radicals to achieve the oxidation effect. The VOCs treatment process and equipment has the advantages that the O3/H2O2/UV/hydraulic cavitation technologies are integrated to generate a large amount of hydroxyl radicals, and the oxidation effect is increased greatly; the equipment is operated under normal temperature and normal pressure and is simple and safe to operate and capable of synchronously desulfurizing, removing heavy metals and removing waste gas components such as dioxin.

Description

technical field [0001] The patent of the invention relates to a treatment of volatile organic compounds in exhaust gas by using heterogeneous catalytic oxidation technology, which is a new type of VOCs treatment technology and belongs to the field of exhaust gas treatment. technical background [0002] VOCs is the English abbreviation of volatile organic compounds (volatileorganiccompounds). The World Health Organization defines total volatile organic compounds as a general term for volatile organic compounds with a melting point below room temperature and a boiling point between 50 and 260 °C. In environmental protection work, countries have introduced the concept of VOCs, emphasizing their photochemical reactivity, health toxicity, etc., but sometimes they also refer to all gaseous organic compounds. Under the action of ultraviolet light, VOCs can generate photochemical smog and secondary pollutants. Phenomena such as acid rain, photochemical pollution, and urban smog are...

AI Technical Summary

Problems solved by technology

Existing treatment technologies have made significant contributions to the reduction of VOCs emissions, but there are also certain technical limitations

[0004] The absorption method is suitable for the treatment of highly water-soluble VOCs, but it is not suitable for the VOCs that are not easily soluble in water and the exhaust gas with smoke;

[0005] The adsorption method has simple equipment and is a traditional waste gas treatment technology, but the adsorbent is easy to reach saturation, and the regeneration of the adsorbent is the bottleneck of the technical application of the limit value;

[0006] The condensation method is suitable for VOCs with high concentration, simple components and high recovery value, but the treatment cost is high, and the discharge cannot meet the standard after treatment; the microbial purification method is simple in principle and does not produce secondary pollutants, but the degradation speed is slow and the area occupied It is difficult to promote in enterprises;

[0007] The catalytic combustion method is suitable for the treatment of high-concentration organic waste gas, but when the waste gas contains heteroatoms such as sulfur and halogen, there will be a risk of dioxins and acid gases will be generated;

[0008] Low-temperature plasma technology has been more and more widely used, but its purification efficiency for organic matter is limited, and it is not suitable for organic waste gases containing halogen atoms. It consumes a lot of energy, and the electrodes need to be cleaned and maintained regularly, and the air intake requirements are high. , it is easy to break down in the presence of water or steam, and it is easy to cause safety accidents

[0009] Therefore, among the existing treatment technologies, there is no good treatment technology for volatile organic waste gas containing acid and heteroatoms. The most widely used regenerative combustion method and plasma method will produce secondary pollution. Corrosion to equipment, potential safety hazard

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