Influence of hydrate structure on continuous separation of coal bed methane gas: A thermodynamic simulation study
Influence of hydrate structure on continuous separation of coal bed methane gas: A thermodynamic simulation study
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DOI：
10.1016/j.jngse.2016.03.063
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发表时间：
2016-09-01
影响因子：
--
通讯作者：
Ohmura, Ryo
中科院分区：
文献类型：
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作者：
Narayanan, Thaneer Malai;Ohmura, Ryo
利用热力学模拟研究了水合物晶体结构对连续CH4 + N-2 气体分离的影响。模拟了仅排出水合物晶体（不是水合物浆料；没有液相）的连续分离过程。根据水合物结构，对简单 sI 系统和异丁烷 sII、甲基环己烷 sH 和新己烷 sH 促进系统进行 35 mol% CH4/N-2 和 50 mol% CH4/N-2 气体分离模拟，压力分别为 1.0 MPa、4.0 MPa 和 7.0 MPa。在稳定状态下，7.0 MPa 下，水合物相中 CH4 浓度 (x(j=CH4,hyd)) 和 CH4 回收率 (S. Fr.) 的递增顺序为异丁烷 sII < 新己烷 sH 近似于甲基环己烷 sH < 简单 sI 体系。在所研究的sII和sH系统中，X-j=CH 4,(hyd) 和S.Fr。在较高压力下的气体分离过程中，稳态时的值较低。对于连续的 35 mol% CH4/N-2 和 50 mol% CH4/N-2 气体分离，可在水合物中回收的最大 CH4 浓度经计算分别约为 64 mol% CH4/N-2 和 77 mol% CH4/N-2。 (C) 2016 Elsevier B.V. 保留所有权利。
Influence of hydrate crystallographic structures on continuous CH4 + N-2 gas separation is studied using thermodynamic simulations. A continuous separation process with discharge of hydrate crystals only (not as hydrate slurry; without liquid phases) is modelled. 35 mol% CH4/N-2 and 50 mol% CH4/N-2 gas separation simulations are performed for simple sI system, and isobutane sII, methylcyclohexane sH and neohexane sH promoted systems at pressures 1.0 MPa, 4.0 MPa and 7.0 MPa depending on hydrate structures. At the steady state, under 7.0 MPa, CH4 concentration in hydrate phase (x(j=CH4,hyd)) and percentage of CH4 recovery (S. Fr.) were in the increasing order of isobutane sII < neohexane sH approximate to methylcyclohexane sH < simple sI systems. In the sIl and sH system studied, X-j=CH4,(hyd) and S. Fr. at the steady state were lower during gas separation at higher pressures. The maximum CH4 concentration that can be recovered in hydrate for continuous 35 mol% CH4/N-2 and 50 mol% CH4/N-2 gas separations are calculated to be approximately 64 mol% CH4/N-2 and 77 mol% CH4/N-2 respectively. (C) 2016 Elsevier B.V. All rights reserved.