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在石油催化裂化过程中产生出来的富气中含有大量的气体烃类。为了回收这些含C_2到C_3组分的烃类,让富气通过解吸塔,应用汽油作为吸收剂回收这些极有价值的气体烃类,这就是解吸塔的作用。某油田炼油厂的解吸塔,塔高30多米,直径2.8米。塔体分多层,由钢板焊接而成。塔中温度分布:塔底利用重沸器加热至110℃,塔顶为了避免C_3组分的脱吸控制在40℃左右。在通过塔的富气中,除上述的各种烃类外,还含有2～5%(体积比)的H_2S,适量的H_2O,少量的CN~-、CO、CO_2等。若按每小时的流量来算,进到解吸系统中去的H_2S就有300～600公斤左右,H_2O大约400公斤左右,CN~-在10公斤左右,这些有害的组分构成了对塔体的腐蚀环境。塔内的工作压力为8公斤/厘米~2。
The rich gas generated during the oil catalytic cracking process contains a large amount of gaseous hydrocarbons. In order to recover these C_2 to C_3 components of hydrocarbons, let the rich gas through the desorption tower, the use of gasoline as an absorbent to recover these extremely valuable gas hydrocarbons, which is the role of desorption tower. An oil refinery desorption tower, tower more than 30 meters high, 2.8 meters in diameter. Tower body multi-layer welded steel plate. Temperature distribution in the tower: the bottom of the tower is heated to 110 ° C by means of a reboiler and the top of the tower is controlled at about 40 ° C in order to avoid desorption of C_3 components. In the rich gas passing through the tower, it contains 2 to 5% by volume of H 2 S, an appropriate amount of H 2 O, a small amount of CN ~ -, CO, CO 2, etc. in addition to the above various hydrocarbons. If the hourly flow to count, into the desorption system to H_2S about 300 to 600 kg, H_2O about 400 kg, CN ~ - about 10 kg, these harmful components constitute the tower body Corrosion of the environment. Working pressure within the tower is 8 kg / cm ~ 2.