Heat Recovery from Hot Wet Regeneration Gas in Dehydration Unit - Badak LNG

Presented at Joint GPA Europe / GPA GCC Annual Conference held in Athens, 21 - 23 September 2016 by
Zaki Arif (Authors: Zaki Arif, Wibisono Triatmojo and Muhammad Hatta, Badak LNG)
Abstract:
Regeneration of saturated dehydration bed in Badak LNG is performed by taking small portion of dried gas exiting the dehydration unit heating up by using high pressure steam (HPS) and then passing it through the saturated bed to drive off absorbed water. Previously, after regenerating the bed, the hot wet gas then is cooled before recycling it to the process upstream.
In order to recover the heat from the hot wet gas, modification was made by adding a heat exchanger utilized as regeneration gas pre-heater. In the pre-heater the hot wet gas is contacted with the cold regeneration gas entering the bed. This new configuration has been proven to reduce HPS consumption for regeneration by approximately 40% (saving $260,000/year).
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