System for treating volatile organic compound, nitric oxide, and oxysulfide by using photocatalyst

Abstract

The invention provides a system for processing volatile organic compound, nitric oxide, and oxysulphide by using photocatalyst, wherein conventional washing tower is improved, lighting equipment is mounted in washing tower with smoke-fog collection device in the outlet, TiO2 photocatalyst solution is used as cleaning liquid or added into cleaning liquid, to decompose volatile organic compound, nitric oxide, and oxysulphide from chemical industry production under proper flow rate and reaction time, which make exhaust gas component up to environmental-protection standard.

Description

technical field [0001] The invention provides a photocatalyst treatment method for volatile organic compounds (abbreviated as VOC), nitrogen oxides (molecular formula NOx, wherein x can be 1 or 2), sulfur oxides (molecular formula SOx, wherein x can be 2 or 3) system, add lighting equipment to the original washing tower, add mist collection equipment at the outlet, and then use titanium dioxide photocatalyst sol solution (or add it to general washing liquid) to effectively decompose volatile organic compounds (VOCs) produced by chemical processes ), NOx, SOx, so that the composition of the exhaust gas meets the environmental protection standards and achieves the purpose of reducing costs. Background technique [0002] Scrubbers have been used in waste gas treatment systems for a long time, mainly to treat acid waste gas and ammonia gas. The focus is to use the characteristics of acid waste gas and ammonia waste gas to be easily absorbed by water, and carry out waste gas trea...

AI Technical Summary

Problems solved by technology

[0002] Scrubbers have been used in waste gas treatment systems for a long time, mainly to treat acid waste gas and ammonia gas. The focus is to use the characteristics of acid waste gas and ammonia waste gas to be easily absorbed by water, and carry out waste gas treatment under appropriate pH control; roughly Generally speaking, as long as the pH is properly controlled, the treatment effect on acid waste gas and ammonia gas can meet the environmental protection standards; There are volatile organic compounds (VOC), NOx (the production line using nitric acid in the production process), SOx (the production line using sulfuric acid in the production process), the composition of which is complex and varies with different processes; but generally speaking, the volatile The solubility of organic compounds (VOC) in water is relatively low, and their dissolution rate is lower, so the efficiency of treating volatile organic compounds (VOC) with traditional scrubbers is often not good; for this phenomenon, there are currently five main treatment methods:

[0003] (1) Chemical oxidation method: add hydrogen peroxide or sodium hypochlorite aqueous solution (bleach powder water) to the washing water to decompose and oxidize volatile organic compounds. Although this method can remove volatile organic compounds (VOC), the reaction speed is slow, resulting in the retention of the washing tower Prolonged time will form a burden on equipment investment, and the residual hydrogen peroxide or sodium hypochlorite aqueous solution (bleach powder water) will form a problem of wastewater

[0004] (2) Activated carbon tower absorption method: using an activated carbon tower as an absorption tower for volatile organic compounds (VOC), this method can indeed effectively absorb volatile organic compounds (VOC) to achieve the purpose of waste gas treatment; but the used active Carbon will generate solid waste, secondary pollution and high cost

[0005] (3) Ozone treatment method: use ozone to decompose volatile organic compounds (VOC). This method can also effectively absorb volatile organic compounds (VOC) to achieve the purpose of waste gas treatment, but the cost of equipment and operation costs is high. Ozone The main reason why the treatment method cannot be promoted

[0006] (4) Plasma treatment method: use plasma to decompose volatile organic compounds (VOC). This method can also effectively adsorb volatile organic compounds (VOC) to achieve the purpose of waste gas treatment, but the equipment cost and operating cost are expensive. It is the main reason why the plasma treatment method cannot be promoted

[0007] (5) Thermal cracking method: use thermal cracking to decompose volatile organic compounds (VOC). This method can also effectively adsorb volatile organic compounds (VOC) to achieve the purpose of waste gas treatment, but there are also expensive equipment costs and operating costs. The problem

[0008] In general, there is currently no specific, effective, fast, cost-effective method for the treatment of volatile organic compounds (VOC) without secondary pollution concerns

[0009] As for the patent part, there are many patents on the application of titanium dioxide photocatalyst to the treatment of exhaust gases containing volatile organic compounds (VOC), NOx, SOx, etc., but the scope of patents claimed is to cover the solid surface with titanium dioxide photocatalyst to form a titanium dioxide photocatalyst film. The titanium dioxide photocatalyst film reacts; this method can also effectively treat waste gas containing volatile organic compounds (VOC), NOx, SOx, etc., but due to the low reaction speed of the film, it is generally only suitable for low-concentration occasions, such as automobile emissions The exhaust gas treatment or the cleaning of indoor air, etc., cannot be applied to the high-concentration exhaust gas produced by the chemical process, and the content of its claims and the object of treatment are different from the present invention

Images