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首页> 外文期刊>Separation and Purification Technology >Modeling and simulation pressure-temperature swing adsorption process to remove mercaptan from humid natural gas; a commercial case study
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Modeling and simulation pressure-temperature swing adsorption process to remove mercaptan from humid natural gas; a commercial case study

机译：建模和仿真变压吸附过程，从潮湿的天然气中去除硫醇;商业案例研究

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Simulation of pressure-temperature swing adsorption (PTSA) process was performed in a commercial two-layer six-bed adsorption system during six sequential steps of cyclic operation to remove mercaptans from natural gas. The feed is a mixture of methane with water vapor, carbon dioxide, heavy hydrocarbons (C3+) and mercaptan impurities. The process is working in the cyclic operational mode to continuously reduce the mercaptan content from 134 to less than 10 ppmv which is determined as the standard level in the environmental regulations. The bed consists of two layers of activated alumina to specifically remove water vapor and 13X zeolite to remove mercaptan, respectively, from natural gas. The cycle steps i.e. adsorption at high pressure, depressurization to the lower pressure, two steps heating with purging hot purified natural gas, cooling the column and pressurization by feed were simulated sequentially. The dynamic model equations were constructed from four mole balances; model molecule of mercaptans, model molecule of heavy hydrocarbons, carbon dioxide and water vapor in natural gas, a total mass balance, a pressure drop equation and two energy balances of solid and gas phases in the adiabatic column. It was observed that the cyclic adsorption was approached to the steady conditions after seven cycles running the program. The predicted molar fractions out of the process were compared with the real results and good agreement was observed between the real data and simulated results. The influential parameters of the process were investigated through a parametric analysis of the process efficiency. Pressure of adsorption stage, purge to feed ratio at regeneration step and temperature of the 1st and 2nd heating steps were found to be the most influential parameters affecting the natural gas purification efficiency. For the sake of energy saving some suggestions were proposed for upgrading the design conditions with no significant effect on the purification performance. The results revealed that reduction of adsorption pressure from 6.8 to 6.1 Mpa, changing purge/feed ratio from 0.06 to 0.045, and combination two heating stages to one stage with 510 K and 12 h operation could be replaced in the operational conditions without significant changes in purification of the product. (C) 2014 Elsevier B.V. All rights reserved.
机译：在商业上的两层六床吸附系统中，在六个连续的循环操作步骤中对压力-温度摆动吸附（PTSA）过程进行了模拟，以从天然气中去除硫醇。进料是甲烷与水蒸气，二氧化碳，重烃（C3 +）和硫醇杂质的混合物。该方法以循环操作模式运行，以将硫醇含量从134连续降低至小于10 ppmv，这是环境法规中确定的标准水平。该床由两层活性氧化铝组成，分别用于从天然气中专门去除水蒸气和13X沸石以去除硫醇。依次模拟了循环步骤，即在高压下吸附，降压至低压，用吹扫的热纯化天然气加热，冷却塔和进料加压的两个步骤。动力学模型方程是由四个摩尔天平构成的。绝热塔中的硫醇分子模型，天然气中重烃，二氧化碳和水蒸气的模型分子，总质量平衡，压降方程以及固相和气相的两个能量平衡。观察到运行程序七个循环后，循环吸附达到了稳定状态。将过程中的预测摩尔分数与实际结果进行比较，并在实际数据和模拟结果之间观察到良好的一致性。通过对过程效率进行参数分析，研究了过程的影响参数。发现吸附阶段的压力，再生阶段的吹扫进料比以及第一和第二加热阶段的温度是影响天然气净化效率的最有影响的参数。为了节省能源，提出了一些建议，以提高设计条件，而对净化性能没有重大影响。结果表明，在运行条件下，在没有明显变化的情况下，可以将吸附压力从6.8 Mpa降低到6.8 Mpa，将吹扫/进料比从0.06改变为0.045，以及将两个加热阶段合并为一个阶段（510 K和12 h运行）。产品的纯化。 （C）2014 Elsevier B.V.保留所有权利。

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