The main technologies for treating organic waste gas at home and abroad include cryogenic cooling and combustion. There are three types of adsorption. The cryogenic method requires large equipment, high energy consumption, large investment, and poor results. The combustion method cannot recover organic solvents and may also cause secondary pollution and safety hazards. The adsorption method is a commonly used method to purify waste gas while recovering organic solvents in the waste gas.
The traditional adsorption method uses granular activated carbon (GAC) as the adsorption material. In foreign countries, in the 1980s, there was a device using activated carbon fiber (ACF) as a suit material. Activated carbon fiber is an adsorption material with large specific surface area, fast adsorption and desorption speed, good quality of recovered solvent, small activated carbon fiber loading volume, and good safety. Compared with granular activated carbon equipment, the equipment is compact and can save 1/2 of the floor space. , saving 60% of water vapor. The activated carbon fiber device developed in this project and put into industrial production realizes fully automatic operation, does not require specialized operators, and gets rid of heavy manual labor and secondary pollution. In the early 1990s, my country introduced several sets of ACF adsorption and recovery devices from Japan. Compared with the ACF adsorption and recovery devices developed and designed by Baoding Guanghua Mechanical and Electrical Equipment Factory and Yuqing Chemical Environmental Protection Industry Development Center, the price of foreign equipment is 8 to 10 times higher. Moreover, our automation control level is higher, and we can form a self-contained system to achieve fully automatic operation, and can also be interconnected with the DCS computer control system of the production process, which is at the advanced level of similar products at home and abroad.
In particular, the three-adsorber cycle operation process successfully developed in Beijing Chemical Plant No. 2 in 1996. This device can process 6700m3 of waste gas per hour, and the recovery rate of dichloroethane in the waste gas is as high as 98.9%, which can be About 10 tons of high-purity dichloroethane are recovered, and the recycled materials generate profits of more than 10 million yuan every year, reaching the world's advanced level. In 2003, there was a major breakthrough in the process design of the "Jingmen Petrochemical Ketone Benzene Dewaxing Unit Methyl Keto and Toluene Waste Gas Purification and Recovery Project". The main organic matter in the waste gas, butanone and toluene, was purified and recovered as high as 99.48%, reaching the world's leading level!
The development of this technology has opened up a new way for the treatment of organic waste gas. Nationally speaking, the gasoline transported by train tank cars is based on an annual production of 28.5 million tons of gasoline and one transportation by train tank cars. The gasoline emitted along with exhaust gas amounts to 42,800 tons, worth 85.6 million yuan. This part of the vehicle emissions The lost gasoline is fully recovered, and its economic and environmental benefits are considerable!
The coating, printing, tape and other production industries that have developed rapidly in my country recently use a large amount of organic solvents; there are not many recycling and treatment devices. The waste gas generated during the production of organic chemical products has caused serious pollution to the environment. We have successfully adopted ACF industrial recycling equipment in both areas, and the results have been good after several years of operation. In addition, this technology has good application prospects for carbon disulfide-containing waste gas from the chemical fiber industry, synthetic materials, pharmaceuticals and other organic waste gases, such as benzene, toluene, xylene, cyclohexane, carbon disulfide, dichloroethane, acetone, etc.
Main performance indicators:
1. Purification recovery rate of organic matter in waste gas:
a. Double adsorber process: >95%~98%
b. Multi-adsorber process: >99%
2. Applicable gas emissions: 100m3/h～10000m3/h
3. Main equipment life: >10 Years
4. Life span of activated carbon fiber: >1.5 years
5. Area occupied: more than 50% saved compared to granular activated carbon device
6. Energy consumption: It saves more than 60% compared with granular activated carbon device
7. Automatically controlled operation, only one operator is required for supervision.