小型轻烃回收装置自凝液制冷工艺设计的指导思想是不设置外冷源，利用自产凝液把制冷系统复叠在小型轻烃回收工艺加工过程中，合二为一。利用小型轻烃回收装置低温分离器自产的凝液将其节流降压，在蒸发器中吸收热介质的热量，自身汽化，汽化后的气体进原料气压缩机与原料气一起增压、冷却冷凝、分离。与外冷源制冷工艺相比，自凝液制冷工艺具有简化工艺、降低能耗、减少投资的优势。自凝液制冷小型轻烃回收工艺适用于富原料气，且原料气体C3+含量不能低于25%。组分中C3+含量越高，制冷效果越明显。%Process design guiding principle of condensate refrigeration of small light hydro-carbon recovery unit is that:not setting the external cooling source, but using self-conden-sate cooling, refrigeration system is set and combined in small light hydrocarbon recovery processes, where two in one. The condensate generated from the cryogenic separation of light hydrocarbon recovery unit will be utilized, throttled and depressurized. Next, in the evaporator, it will exchange heat with the media and be evaporated. Lastly, the evaporated gas will enter the feed gas compressor together with the feed gas, they would be pressurized, cooled, condensed and separated. Being compared with the external cooling source pro-cess, this method has the advantages of simplifying the process, reducing the energy con-sumption, and the investment, etc. Condensate refrigeration technology of small light hy-drocarbon recovery unit is suitable for the rich raw material gas, and C3+ content of raw ma-terial gas can't be lower than 25%. The higher component of C3+ content, the more obvious cooling effect.
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