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Treatment technology of VOCs governance industry
2017-03-27965
VOCs are the command organic compounds, but in the sense of environmental protection, they are the active volatile organic compounds, that is, the kind of volatile organic compounds that will cause harm. For our country, due to the unreasonable economic institutions, high energy consumption, high pollution enterprises in the past, the domestic air environment has reached an unbearable situation. Haze has become a haze over the whole country.
The control and governance market of VOCs can be divided into source emission reduction, end of pipe governance, VOCs monitoring and third-party services. According to Xinda Securities Research Report, as China has not yet established a list of sources of VOCs Pollution enterprises, source emission reduction is just starting. The market space for VOCs governance in 2017-2018 is mainly composed of two parts: one is the input of monitoring equipment for petrochemical industry, packaging and printing industrial park and key VOCs regulatory enterprises; the other is the input of VOCs recovery and end-of-life governance implemented by key enterprises themselves or by a third party entrusted. It is estimated that the market space for VOCs monitoring and governance in 2017-2018 is about 43.8 billion yuan
In the field of storage and transportation of oil and gas and other VOCs containing products, the investment by 2020 will be about 46.35 billion yuan. It mainly includes the transformation of floating roof tank or the installation of top space connection replacement oil and gas recovery filter device, as well as the laying of recovery pipeline in the gas station, and the use of oil and gas recovery type refueling gun to reduce the emissions caused by storage and transportation
According to the principle of VOCs generation in the atmosphere and the physical and chemical properties of VOCs, the control technology can be divided into two categories: process control and terminal control. Process control is aimed at the production process of VOCs. It can reduce the production of VOCs from the principle of VOCs. Generally, it is realized through process improvement, technical transformation and leakage control. Terminal control is aimed at the chemical characteristics of VOCs, focusing on the treatment of VOCs exhaust gas, using combustion, decomposition and other methods to control VOCs emissions
The recovery technology of VOCs mainly uses the physical properties of VOCs, uses absorption, adsorption, condensation and other methods to separate VOCs from waste gas, and then takes certain measures to collect and recover VOCs, so as to achieve the end treatment of VOCs emission.
The condensing method uses the property that VOCs has different saturated vapor pressure at different temperatures. It uses two conditions, i.e. reducing temperature, increasing pressure or both, to condense VOCs in steam state and separate VOCs from exhaust gas. Condensation is often used as a pre purification treatment of high concentration organic gas. The adsorption method is a purification method that uses the molecular attraction and chemical bond on the solid surface to adsorb VOCs on the porous solid surface, so as to separate VOCs from the waste gas. This method is widely used because of its strong selectivity and good separation effect. Membrane separation is a method which uses the ability and speed of organic vapor passing through the semipermeable membrane to get separation.
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