Optimized LPG extraction improves LNG high heating value

Sonatrach's GL1-Z LNG plant in Arzew, Algeria, installed an LPG-recovery heat exchanger downstream of an existing overhead condenser to alleviate problems due to changes in the plant's feed composition. The new exchanger uses a multicomponent refrigerant (MCR) as the cooling medium.Although operating problems in the scrub tower were resolved, the LNG product high heating value (HHV) decreased and the fractionation unit became overloaded.This article discusses the installation and optimization of the installed LPG-recovery heat exchanger.The plant originally processed a heavy natural gas. Currently, and since the start-up of a new neighboring LPG plant, the feed quality has become le...

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