【摘要】：針對直接換熱(DHX)常規(guī)流程重接觸塔塔底凝液直接進脫乙烷塔塔頂造成重接觸塔塔頂回流重?zé)N含量多、冷凝吸收效果差、丙烷回收率低的缺陷。通過增設(shè)脫乙烷塔塔頂回流罐得到兩種改進流程:(1)改進流程Ⅰ,脫乙烷塔塔頂回流罐分離液相作重接觸塔和脫乙烷塔塔頂回流;(2)改進流程Ⅱ,脫乙烷塔塔頂回流罐分離氣相冷卻后作重接觸塔塔頂回流,分離液相作脫乙烷塔塔頂回流。并針對不同的原料氣壓力及氣質(zhì)貧富,對兩種改進流程進行調(diào)整,分別得到適用于中壓凝析氣、低壓油田伴生氣和高壓凝析氣丙烷回收的DHX改進流程。并通過HYSYS軟件對3種流程進行模擬對比分析,結(jié)果表明改進流程Ⅰ對于中壓和高壓凝析氣丙烷回收率均很高(99%),但對于油田伴生氣改進效果不明顯,并且改進流程Ⅰ對高壓凝析氣進行丙烷回收時能耗較高。而改進流程Ⅱ在不同原料氣氣質(zhì)工況下均表現(xiàn)出很高的回收率(99%),且能耗較低,是一種回收率高、適應(yīng)范圍廣、節(jié)能高效的丙烷回收流程。因此可得結(jié)論:改進流程Ⅱ是3種流程中的最佳丙烷回收流程,但改進流程Ⅰ在某些特殊條件下也是一種值得參考的流程。
[Abstract]:Aiming at the defects of direct heat transfer (DHX) process, such as heavy hydrocarbon content in reflux, low recovery rate of propane and low recovery rate of propane caused by direct contact column bottom condensate directly into deethane tower top, the refluxing heavy hydrocarbon content of refluxing tower top of heavy contact tower is more, the condensation absorption effect is poor, and the recovery of propane is low. Two improved processes were obtained by adding a top reflux tank for deethane tower: (1) improved flow 鈪，

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