activated carbon is a kind of very small granular has a large surface area, and more tiny holes in the granular - capillary. The capillary has very strong adsorption capacity, due to the granular surface area is large, so a good contact with with gas (impurities). When these gases (impurities) encounter capillary by adsorption, purification effect. Activated carbon surface area of the study is very important, only the BET specific surface area detecting data of active carbon method detected result is reliable, domestic at present there are many instruments can only make direct comparison method of detectionThe surface area of the activated carbon should include the inner surface area and the outer surface area. In fact, the adsorption properties mainly come to the inner surface area of the white Li large, so it can not be mistaken for: the activated carbon grinding and grinding will significantly improve the surface area to improve the adsorption force.activated carbon coconut shell
Many adsorbations are recursive physical adsorption, that is, the adsorbed matter is a fluid, which is adsorbed by activated carbon at a certain temperature and pressure. At high temperature and low pressure, the adsorbed matter desorbs out, and the inner surface of activated carbon returns to its original state.The treatment of organic waste gas mainly includes two categories: recovery method and elimination method.The main recovery technologies of organic waste gas include: adsorption method, absorption method, condensation method, membrane separation technology and pressure swing adsorption technology.Organic waste gas elimination technology can be divided into two categories: physical - chemical method and biological method.Physical - chemical methods include thermal destruction, photodecomposition, corona, ozone decomposition, etc.Biological methods include biological filter, biological drip filter, biological scour tower, membrane bioreactor, activated sludge process, etc.The purification rate of activated carbon adsorption method can reach more than 95%, if there is no regeneration device, the operation cost is too high, if the steam recovery, the process is too long, the operation cost is high, the recovery of solvent and water mixture utilization value is not high;Regeneration needs a stable steam source, and the adsorption capacity of activated carbon after repeated adsorption and desorption will gradually reduce, generally use two or three years after the replacement.The purification rate of liquid absorption method is only 60%-80%, and there are secondary pollution problems.activated charcoal wholesale
The purification rate of catalytic combustion method can reach 95%, but it is suitable for the treatment of high concentration, small air volume and high exhaust gas temperature of organic waste gas, and the gas temperature is higher, in order to improve the exhaust gas temperature, it needs to consume a lot of energy.The most used method is a catalytic combustion method, adsorption, it mainly particles or honeycomb carbon as adsorbent, to ensure the continuity of production, generally set up two adsorption bed used interchangeably, as a result of the switching cycle at least for ld, so adsorption bed volume big, adsorbent dosage, heavy equipment, large investment, operation trouble;As the bed volume is large, it is easy to appear the combustion and explosion caused by the accumulation of adsorption heat.To solve these problems, the adsorber of the existing new device adopts a multi-unit shunt combination structure, and uses a new material -- activated carbon fiber as adsorbent