Simulation of absorption-hydration separation unit for gas mixture by non-equilibrium stage approach

doi:10.11949/j.issn.0438-1157.20141195

Abstract

Abstract: It has been accepted that separation of low boiling-point gas mixture via hydrate technology has the advantage of operating at around 0℃, and therefore can reduce the refrigerating energy consumption dramatically. It is necessary to study the simulation algorithm for the operation process because this separation technique is still at the stage of theoretical research and has not fulfilled practical industrial application. In this work, a process of hydration and absorption two-tower series operation was simulated by using the non-equilibrium stage approach, which involved hydrate formation kinetic model, hydrate dissociation kinetic model, and mass transfer kinetic model when gas was absorbed in water-in-oil emulsion. The effect of operation parameters of two series towers, such as temperature, pressure on separation efficiency was investigated. The calculation results are of significance for designing separation process for low boiling-point gas mixture via hydrate technology, and can also lay a theoretical foundation for industrial application of this separation technique.

Key words: gas hydrate, water-in-oil emulsion, absorption-hydration, separation tower

摘要： 水合物技术应用于低沸点气体混合物分离的优势在于其可在0℃左右操作,因此可极大地降低制冷所消耗的能量。由于此分离方法尚处在理论研究阶段,还不能实现工业化,因此对操作流程模拟计算的研究很有必要。采用非平衡级法(速率法)对水合塔-吸收塔串联操作流程进行了模拟计算,其中涉及水合物生成动力学模型、水合物分解动力学模型以及混合气体在乳液相的吸收传质动力学模型。探讨了两个串联分离塔操作参数,如温度、压力等,对分离效率的影响,所得结果对水合物技术分离低沸点气体混合物流程的设计有重要意义,同时也可为以后的工业化奠定一定的理论基础。

关键词: 气体水合物, 油水乳液, 吸收-水合, 分离塔

CLC Number:

TQ013.1

MA Qinglan, LEI Yahui, CHEN Guangjin. Simulation of absorption-hydration separation unit for gas mixture by non-equilibrium stage approach[J]. CIESC Journal, 2015, 66(5): 1748-1759.

马庆兰, 雷雅慧, 陈光进. 非平衡级法气体混合物吸收-水合双塔分离单元的模拟计算[J]. 化工学报, 2015, 66(5): 1748-1759.

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