Streamlined Natural Gas Treatment by Membranes Only

Udo Dengel, S. Karode, Yong Ding
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Abstract

Offshore gas treatment faces constraints for space and weight limits. This paper will present an innovative concept of using only membranesto remove multiple contaminants, reduce weight, space and cost on offshore installations and becoming an enabler for gas monetization. Membrane separation is a cost effective way to remove CO2 from natural gas. The typical offshore membrane treatment package usually consists of a relatively complex pre-treatment step followed by a simple membrane system to remove CO2. The solution using only membranes for gas treatment consists of: a first stage of poly (ether ether ketone) or PEEK membranes, resistant to the main impurities in natural gas, able to remove H2S, heavy hydrocarbons and water, thus essentially replacing the pre-treatment for offshore CO2 removal membrane packages a second stage of poly-imide membranes with high CO2 / CH4 selectivity for CO2 removal The membrane-only solution can be applied for treatment of large volumes of gas for pipeline specification to remove CO2 and other contaminants. Key benefits are simplicity of operation, compactness of footprint, weight reduction and a reduction in or elimination of adsorbent media replacements. Topside weight and cost reduction can increase gas treatment capacity and flexibility and are an enabler for gas monetization. Due to their resistance to impurities PEEK membranes can also be used to treat flared gas for valorization through gas-to-power applications, thus reducing flaring. For gas-to-power applications, the gas will undergo some basic conditioning (such as hydrocarbons dew point, BTU adjustment, H2S removal) by a compact membrane unit to be used for power generation on the offshore platform.
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流线型天然气膜处理
海上天然气处理面临空间和重量限制的限制。本文将介绍一种创新的概念,即仅使用膜来去除多种污染物,减少海上设施的重量、空间和成本,并成为天然气货币化的推动因素。膜分离是从天然气中去除二氧化碳的一种经济有效的方法。典型的海上膜处理包通常包括一个相对复杂的预处理步骤,然后是一个简单的膜系统来去除二氧化碳。仅使用膜进行气体处理的溶液包括:第一级为聚醚醚酮或聚醚醚酮膜,耐天然气中的主要杂质,能够去除H2S、重碳氢化合物和水,从而基本上取代了海上CO2去除膜包的预处理;第二级为聚酰亚胺膜,具有高CO2 / CH4选择性,用于CO2去除。主要优点是操作简单,占地面积小,重量减轻,减少或消除了吸附介质的更换。上层重量和成本的降低可以提高天然气处理能力和灵活性,并促进天然气货币化。由于其抗杂质性,PEEK膜也可用于处理燃烧气体,通过燃气发电应用进行增值,从而减少燃烧。对于天然气发电的应用,天然气将通过紧凑型膜装置进行一些基本的调节(如碳氢化合物露点、BTU调节、H2S去除),用于海上平台的发电。
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