深冷装置重烃塔顶回流技术研究与应用

Research and Application of the Heavy Hydrocarbon Overhead Reflux Technology of Cryogenic Units

针对大庆油田深冷装置原料气CO_2含量高,深冷自产重烃未有效利用的问题,分析重烃冷却温度、流量等因素对轻烃及CO_2吸收效果影响的规律,提出了深冷重烃塔顶回流改造技术。南八深冷装置现场应用证明,将深冷自产重烃作为吸收剂对干气中轻烃及CO_2进行二次吸收,可降低装置制冷温度,使装置轻烃收率显著提高。该技术相对于其他脱除CO_2方法工艺改造简单,投资少,不增加装置能耗,且轻烃增产效果显著,可以在天然气处理深冷装置中推广应用。

In order to solve problems that the raw gas of the cryogenic unit in Daqing Oilfield is with high content of CO_2 and the use of heavy hydrocarbon produced by the cryogenic unit is not effective,the influence law of factors such as the cooling temperature and flow rate of heavy hydrocarbon on the absorption effect of light hydrocarbon and CO_2 are analyzed,and the heavy hydrocarbon overhead reflux transformation technology of cryogenic units is proposed.The field application of Nanba cryogenic unit proves that as the absorbent, the cryogenic produced heavy hydrocarbon can secondarily absorb the light hydrocarbon and CO_2 from dry gas,reduce the cooling temperature of the device and significantly increase the yield of light hydrocarbon. Compared with other methods of CO_2 removal, the transformation of the technology is simple in process,the investment of it is less,the energy consumption of the device does not increase, and the light hydrocarbon yield increasing effect is significant,thus can popularizing and applying in cryogenic units for natural gas treatment.