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石蜡油回收工序(Paraffin Oil Recovery Process)

石蜡油回收工序:尾气首入石蜡吸收塔,石蜡与尾气进行逆流吸收,在不锈钢填料较大比表面积状态下,吸收达到理想状态。出来的石蜡液(称作富油)含溶剂量不超过5%,以保证大的吸收率。
石蜡富油以泵打入石蜡热交换器,与石蜡贫油进行热交换,然后经石蜡加热器,后进入石蜡解析塔,在解析塔中,用直接蒸汽与富油石蜡在不锈钢填料表面上进行汽-液热交换,将石蜡中的溶剂脱除。这种石蜡称之为贫油,然后再与富油热交换后,后经冷却器冷却至理想的吸收温度,再进入吸收塔循环使用,解析塔出来的混合汽体进入节能器,吸收塔排出的尾气用风机排出车间。
在溶剂回收系统中的溶剂经分水箱进周转罐,直接汽冷凝成的废水从分水箱中排出,若含有定溶剂,再经过蒸煮罐蒸煮,达到排放要求。

Paraffin Oil Recovery Process: tail gas first enters paraffin absorption tower, and then comes the counter-current absorption of paraffin and tail gas, which can reach the ideal state when the stainless steel packing has large surface area. The solvent content in discharged liquid paraffin (called rich oil) is not more than 5%, so as to ensure the maximum absorption rate.

The paraffin rich oil is pumped into the heat exchanger to exchange heat with paraffin lean oil, and then goes to paraffin heater, and finally enters paraffin analysis tower. In the analysis tower, the steam-liquid heat exchange is conducted on the surface of stainless steel packing surface with direct steam and rich-oil paraffin, which can remove the solvent in the paraffin. This kind of paraffin, also called lean oil, exchanges heat with rich oil, and then is cooled to the ideal absorption temperature through the cooler. Next, it enters absorption tower for recycling. The gas mixture from the analysis tower enters energy saver, and the tail gas from the absorption tower is discharged from workshop with the fan.

In solvent recovery system, the solvent enters the holding tank through water tank, and the condensed waste water is discharged from water tank. If the tail gas contains certain solvent, cook it with the cooker to make it meet the emission requirements.

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