[Inventory] VOCs management technology and related businesses

Recently, the Ministry of Industry and Ministry of Finance and the two ministries jointly issued the "action plan for the reduction of volatile organic compounds in key industries" (hereinafter referred to as the "Plan"). This is another good policy following the Pilot Scheme for Charges of Volatile Organic Compounds (Cai Shui [2015] No. 71) and the inclusion of VOCs in the total amount of environmental protection under the 13th Five-Year Plan. The Plan states that industry is a priority area for VOCs emissions, accounting for more than 50% of total emissions. The Plan calls for insisting on source reduction and process control as the key points and taking into consideration the whole-process prevention and control philosophy of end-end management, promoting the implementation of raw material substitution and technological transformation of cleaner production, upgrading cleaner production and promoting green transformation and upgrading of the industry. Proposed that the VOCs emissions of the industrial sector should be reduced by 3.3 million tons or more by 2015 from 2015 levels.

To this end, the technical progress of VOCs treatment and the key enterprises in the industry are summarized as follows:

First, VOCs treatment technology progress

In recent years, China VOCs treatment technology has been rapid development. Some mainstream technologies such as adsorption, incineration, catalysis and bioremediation continue to expand and improve. Some new technologies, such as low temperature plasma, photolysis and photocatalysis, are also constantly being perfected .

(A) adsorption (regeneration) process

Adsorption recovery technology is mainly applied to oil and gas recovery, packaging and printing, petrochemicals, chemical industry, container spraying, raw materials manufacturing and other industries. In terms of specific processes, the continuous improvement of low-pressure steam desorption and regeneration technology is still the mainstream; newly developed nitrogen protection and regeneration process can reduce the cost of recovery of solvent purification while improving safety; vacuum (depressurization) desorption and regeneration technology at high concentrations Oil and gas recovery has also been a lot of applications.

Adsorption and concentration technology is suitable for the recovery of VOCs with low concentration and high volume of air discharged from industrial exhaust. Zeolite runner adsorption concentration technology is the mainstream technology.

Activated carbon adsorption regeneration technology is simple, low cost, suitable for spraying, printing, chemical, pharmaceutical and other industries a large number of scattered small businesses. However, from the perspective of economic and technological feasibility, it is advisable to collect activated carbon that has been adsorbed and used for centralized and unified regeneration.

(B) regenerative (catalytic) combustion technology

Catalytic combustion technology and high-temperature incineration technology is the mainstream technology of VOCs treatment, but also the most effective and thorough treatment technology. In recent years, the development of regenerative thermal incineration (RTO) and regenerative catalytic combustion (RCO) for organic matter concentration is low occasions, has been a lot of promotion.

(C) biological treatment technology

Biological method equipment is simple, low investment and operating costs, no secondary pollution, in addition to the field of deodorant, benefiting from the breakthrough of various biological agents and fillers in recent years, and gradually expanded to ketones, aldehydes, lipids, etc. Various types of low concentrations of organic matter purification.

(D) combination of management techniques

The difficulty of VOCs treatment lies in the extremely complex composition. It is often difficult to achieve the effect of treatment with a single treatment technique, and a combination of multiple treatment techniques is usually required. In recent years, various combinations of treatment processes developed rapidly, such as adsorption enrichment + catalytic combustion technology, adsorption enrichment + high temperature incineration technology, absorption and concentration + absorption technology, low temperature plasma + absorption technology, low temperature plasma + catalytic technology. From the current practice of governance, most industries in the treatment of VOCs need to use combination technology, some industries even need to use two or more combination of technology to ensure that the treatment effect.

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