Volatile organic waste gas is a kind of organic pollutant with complex components, which is ubiquitous in the air. In China, VOCs refer to organic compounds with saturated vapor pressure above 70Pa at normal temperature and boiling point below 260℃ at normal pressure. Its main components are hydrocarbons, sulfides, ammonia and so on.
Its pollution is mainly manifested in two aspects. On the one hand, most VOCs have toxicological properties and are harmful to human health. Organic waste gas is a kind of pollutant harmful to human health. It reacts with NO2 in the atmosphere to generate O3, which can form photochemical smog and be emitted into the air. It has peculiar smell and stench, which can stimulate people's eyes, nose and respiratory tract, and has adverse effects on heart, lungs, liver and other internal organs and nervous system. Some of them are allergens that affect some human organs and bodies. On the other hand, some VOCs have strong photochemical reactivity and can undergo secondary transformation in the environment. Its photochemical reaction dominates the process of photochemical smog, which is very important for the generation of ozone in cities and regions, and is also one of the important precursors leading to haze weather, and can also lead to crop yield reduction.
Therefore, more and more countries attach importance to the control of VOCs, and many developed countries have promulgated corresponding laws to limit the emission of VOCs, which has become a hot spot in air pollution control.
According to endless Q statistics, 80% of the enterprises that produce organic waste gas in all industries have no VOC waste gas treatment equipment, and the waste gas is directly discharged; 65,438+00% enterprises have thermal incinerators, and the remaining 65,438+00% enterprises have other forms of waste gas treatment equipment. In the enterprises with waste gas treatment equipment, more than half of them don't use it often because of the high operating cost.
The Twelfth Five-Year Plan for Air Pollution Prevention and Control in Key Areas, a comprehensive plan for air pollution prevention and control issued by the Ministry of Environmental Protection of China, clearly points out that volatile organic compounds (VOCs) are one of the key pollutants for air pollution control in the next stage. It can be seen that the problem of VOCs pollution has aroused great concern in China.
VOCs organic waste gas treatment scheme The whole process VOCs solution includes: VOCs pollution discharge link investigation, VOCs monitoring system and total amount estimation, whole process VOCs treatment scheme preparation, source control measures in production process, customized terminal VOCs treatment technical scheme, treatment effect evaluation and emission reduction evaluation. Among them, the investigation of pollution links and the control of the whole process are the key to the remediation of VOCs in industrial enterprises. Through on-site investigation of pollution links such as storage tank, loading and unloading, equipment leakage, process waste gas, unorganized discharge, wastewater collection and treatment system, cooling water, combustion waste gas, accident discharge, etc., the pollution links are investigated one by one, and the whole process of VOCs is combed from source to end to control VOCs pollution in the whole process.
VOCs waste gas treatment technology VOCs have a wide variety, wide sources and complex components, including hydrocarbons, alcohols, ethers and esters. VOsC emissions will be produced in gas stations, decoration, catering, dry cleaning, spraying, chemical industry and other industries that produce or use organic solvents. Even if the same substance, air volume and concentration are different, the required technical route is different. This also determines that no technology can solve all VOCs problems. There are dozens of VOCs waste gas treatment methods, and their principles are mainly the recovery technology of recovering valuable solvents and the destruction technology of decomposing VOCs molecules. In practical application, more combination technologies are adopted. If the concentration and combustion technology are combined to treat low-concentration and large-volume waste gas, the investment of the device will be reduced; Adopting catalytic combustion (CO) or regenerative combustion (RTO) technology to realize low energy consumption and thoroughly control VOCs. According to the solubility, boiling point and other characteristics of VOCs, temperature swing adsorption or pressure swing adsorption is selected for solvent recovery, and the specific choice depends on the working conditions of the customer's production line.
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