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首页> 外文期刊>Journal of natural gas science and engineering >Mercaptan removal from natural gas by the efficient cyclic adsorption process; a simulation study
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Mercaptan removal from natural gas by the efficient cyclic adsorption process; a simulation study

机译：通过高效的循环吸附工艺从天然气中脱除硫醇;模拟研究

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A more efficient and economical cyclic adsorption process was proposed for mercaptan removal from natural gas (NG) to reduce mercaptan content to less than 10 ppm and meet the environmental rules. Continuous sulfur removal is studied for the NG feed stream, with pressure of 6.8 MPa, flow rate of 2850 Nm(3)/hr and molar composition of 95.98% methane, 0.00182% water vapor, 1% carbon dioxide, 0.0134% mercaptan and 3% heavier hydrocarbons (C3(+)). The proposed process of Pressure Vacuum Swing Adsorption (PVSA) was designed and simulated as a more efficient alternative process against the current Industrial Pressure-Temperature Swing Adsorption (PTSA). In this work, an improved PVSA process was simulated with sequences of bed pressurization, adsorption, equalization, blow down, bed regeneration by vacuum and purge by product, in each process cycle. Vacuum condition of 10 KPa with the molar purge/feed ratio of 0.06 and temperature of 350 K was required for appropriate bed regeneration from adsorbed mercaptan to approach to the continuous cyclic steady condition. Comparison between PVSA and PTSA, at the same feed characteristics, same packed columns and adsorption operating conditions, revealed that the PVSA process, with less cycle time than PTSA, could achieve the same product purity with 94.8% recovery and 3.90 [mol/kg day] productivity, whereas PTSA has the recovery of 74.04% and productivity of 2.79 [mol/kg day]. At the same time, operating with PVSA, instead of PTSA process, would reduce the operating cost from 88 to 70 [Thousand $/year]. (C) 2015 Elsevier B.V. All rights reserved.
机译：提出了一种更有效和经济的循环吸附工艺，用于从天然气（NG）中去除硫醇，以将硫醇含量降低至10 ppm以下并符合环境法规。对NG进料流进行了连续脱硫研究，压力为6.8 MPa，流速为2850 Nm（3）/ hr，摩尔组成为95.98％甲烷，0.00182％水蒸气，1％二氧化碳，0.0134％硫醇和3 ％的较重烃（C3（+））。设计并模拟了拟议的压力真空摆动吸附（PVSA）工艺，以相对于当前的工业压力-温度摆动吸附（PTSA）作为更有效的替代工艺。在这项工作中，对改进的PVSA工艺进行了仿真，并在每个工艺周期中依次进行了床加压，吸附，平衡，吹扫，真空床再生和副产品吹扫的过程。从吸附的硫醇适当床再生到连续循环稳态需要10 KPa的真空条件和0.06的摩尔吹扫/进料比和350 K的温度。在相同进料特性，相同填充塔和吸附操作条件下对PVSA和PTSA的比较表明，PVSA工艺比PTSA循环时间短，可以实现相同的产品纯度，回收率达到94.8％，日产量为3.90 [mol / kg生产率，而PTSA的回收率为74.04％，生产率为2.79 [mol / kg日]。同时，使用PVSA而不是PTSA流程可以将运营成本从88降低到70 [千美元/年]。 （C）2015 Elsevier B.V.保留所有权利。

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