Variable temperature adsorption is an operating method that uses the equilibrium adsorption capacity of the adsorbent to decrease with increasing temperature, using ambient temperature adsorption and rising temperature desorption in small air separation unit. Two or more adsorption towers are usually set up to operate in cycles to achieve continuous production, with one (or several) adsorbing impurities near ambient temperature and the others staggering through each other in different stages of desorption regeneration (pressure drop, hot blow, cold blow, boost, etc.) to achieve continuous production. Coke oven gas is a common feed gas for PSA hydrogen extraction, but it contains a large number of impurities such as tar, sulphide, ammonia, naphthalene, benzene etc. which must be pre-treated. If fixed bed stripper is used, it will soon become saturated due to the large amount of impurities and the high dosage and frequent replacement of the stripper. The fixed bed is mainly used to remove H2S and tar and part of the naphthalene in advance, so that the desorption gas of the variable temperature adsorption can be directly fed into the fuel network with reduced sulphur and tar content. The regeneration of the VTS can be done with N2 if possible, or the PSA desorption gas can be returned as regeneration gas.
Dear Air Separation's global service network, networked service platform throughout the country and Russia, Southeast Asia, the Middle East, Europe and other countries and regions to ensure that the first time to provide global customers with intelligent solutions.
