Thermodynamic Simulations of Hydrate-Based Removal of Carbon Dioxide and Hydrogen Sulfide from Low-Quality Natural Gas
Thermodynamic Simulations of Hydrate-Based Removal of Carbon Dioxide and Hydrogen Sulfide from Low-Quality Natural Gas
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DOI：
10.1021/ie402010p
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发表时间：
2013-10
影响因子：
4.2
通讯作者：
S. Akatsu;Shuhei Tomita;Y. Mori;R. Ohmura
中科院分区：
文献类型：
--
作者：
S. Akatsu;Shuhei Tomita;Y. Mori;R. Ohmura
本文旨在提出一种计算方案，以热力学模拟从低质量天然气中形成笼形水合物、二氧化碳（CO2）和硫化氢（H2S）的连续多阶段分离操作，并显示气相组成、形成的水合物的晶体结构和组成以及气/水-液/水合物平衡温度（水合物形成的较高温度极限）的逐级变化。本文首先介绍了该计算方案的基本概念和算法，然后将该方案应用于具体天然气模型为CH4 + C2H6 + C3H8 + N2 + H2S + CO2混合物的处理。结果表明，最佳级数应在提高CO2和H2S的脱除率和增加残余气体中可燃物质（特别是C2H6和C3H8）的损失之间找到一个折衷点，并随着级数的增加而增加。
This paper aims at presenting a computational scheme to thermodynamically simulate a continuous multistage operation for separating, by forming clathrate hydrates, carbon dioxide (CO2) and hydrogen sulfide (H2S) from a low-quality natural gas and at showing the stage-to-stage changes in the gas-phase composition, the crystallographic structure and composition of the formed hydrate, and the gas/aqueous-liquid/hydrate equilibrium temperature (the higher temperature limit for hydrate formation). The paper first describes the fundamental concept and algorithm of the computational scheme and then applies the scheme to the processing of a specific natural gas modeled as a CH4 + C2H6 + C3H8 + N2 + H2S + CO2 mixture. It is demonstrated that the optimum number of stages should be determined by finding a compromise between the improving removal of CO2 and H2S and increasing losses of combustible substances, particularly C2H6 and C3H8, from the residual gas with an increasing number of stages.