Activated carbon regeneration process—catalytic combustion method

Author : Clirik

Usually there are two ways of desorption regeneration of activated carbon, namely: steam regeneration and catalytic combustion regeneration.
1. Introduction of steam regeneration method 
(1) The steam regeneration method was put on the market in the 1980s, and granular activated carbon is generally used for adsorption, which has high equipment resistance and high operating costs for the main exhaust fan.  
(2) Because of the active problem of granular activated carbon, its specific surface area is small, and the adsorption efficiency of benzene series (benzene, toluene, xylene) is not high (about 15-18%), so the equipment purification efficiency is generally not Over 85%,  
(3) Because the pore size of granular activated carbon is very small, organic solvents and some impurities (such as a small amount of paint mist entering the equipment) will be blocked quickly after a period of use, and the purification efficiency will rapidly decrease over time, and the life of regeneration Relatively short (generally 2-3 years), and the desorption regeneration time is relatively longer than other methods.  
(4) The operation of steam desorption and regeneration is quite cumbersome (conditions of the steam valve, manual operation of the condensation separation system, etc.), requiring 1-2 personnel to operate at fixed positions.
(5) There are three treatment methods for the condensed and recovered solvent after steam regeneration 
① It can be reused by adding rectification equipment for separation (generally, the solvent produced by the regeneration of printing waste gas is difficult to re-use in the market because the ingredients are mixed with many other pollutants).  
②Send to garbage treatment plant for incineration.  
③ It is mixed with coal and sent to the boiler to burn.
(6)  The problem of secondary pollution of wastewater will occur, and wastewater needs to be discharged up to standards.
(7) A set of boiler or steam generator dedicated to activated carbon regeneration is required.  
(8) The internal anti-corrosion of the equipment must be handled well, otherwise the equipment is easy to rust and the service life is relatively shortened.
2. Introduction of catalytic combustion regeneration method
(1) The catalytic combustion regeneration method was put on the market in the early 1990s. The adsorption adopts a new type of activated carbon adsorption material-honeycomb activated carbon. Compared with pellets (rods), it has: excellent thermodynamic properties, low power, low consumption, and low power consumption. High adsorption rate and so on. It has excellent adsorption properties, a porous honeycomb structure, developed pore structure, large specific surface area, and low fluid resistance. This product is especially suitable for the purification and treatment of high-volume, low-concentration organic waste gas; at present, this equipment has been used in my country's automobile, printing, plastics, hardware, electronics and other industries for nearly 20 years.
(2) The benzene absorption efficiency is high (usually around 25-30%), so the equipment purification efficiency can reach 90%.
(3) The investment cost of activated carbon is relatively high, but the use time is relatively prolonged (generally 2-3 years)  (4) The operation of catalytic combustion desorption regeneration is simple, and the desorption is controlled by PLC program. As long as the heating temperature is set during debugging, The desorption fan automatically starts and shuts down with the change of the desorption temperature.  
(5) After more than ten years of improvement and development, there have been multiple safety protection measures to ensure that the equipment has no hidden safety hazards.
(6) When the organic solvent is returned to catalytic combustion during desorption, a large amount of heat will be generated, and the heating system of catalytic combustion will automatically stop, thereby reducing operating costs.  
(7) Catalytic combustion regeneration is adopted, which will not produce secondary pollution.

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