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Performance evaluation and optimisation of post combustion CO2 capture processes for natural gas applications at pilot scale via a verified rate-based model

机译:通过经验证的基于速率的模型,对中试规模的天然气应用的燃烧后CO2捕集过程进行性能评估和优化

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摘要

CO2 absorption based on chemical reactions is one of the most promising technologies for post combustion CO2 capture (PCC). There have been significant efforts to develop energy efficient and cost effective PCC processes. Given that PCC is still maturing as a technology, there will be a continuing need for pilot scale facilities to support process optimisation, especially in terms of energy efficiency. Pilot scale PCC facilities, which are usually orders of magnitude smaller than those that will be used in future in large scale fossil power plants, make it possible to study details of the PCC process at an affordable scale. However, it is essential that pilot scale studies provide credible data, if this is to be used with confidence to envisage the future large-scale use of the PCC process, especially in terms of energy consumption. The present work therefore establishes and experimentally verifies (using a representative pilot plant as a case study) procedures for analysing the energy performance of a pilot scale amine based CO2 capture plants, focusing on natural gas fired applications. The research critically assesses the pilot plant’s current energy performance, and proposes new operating conditions and system modifications by which the pilot plant will operate more efficiently in terms of energy consumption. The methodology developed to assess and improve the energy performance of the PCC process is applicable, with appropriate inputs, to other plants of this type that employs aqueous 30 wt. % monoethanolamine (MEA) solution as the solvent. A rate based model of the post combustion CO2 capture process using an aqueous solution of 30 wt. % MEA as the solvent was developed in Aspen Plus® V.8.4, and verified using the results of experimental studies carried out using the UK Carbon Capture and Storage Research Centre / Pilot-scale Advanced Capture Technology (UKCCSRC/PACT) pilot plant, as a representative pilot-scale capture plant, and employed for parametric sensitivity studies. Several parameters have been identified and varied over a given range of lean solvent CO2 loading to evaluate their effects on the pilot plant energy requirement. The optimum lean solvent CO2 loading was determined using the total equivalent work concept. Results show, for a given packing material type, the majority of energy savings can be realised by optimising the stripper operating pressure. To some extent, a higher solvent temperature at the stripper inlet has the potential to reduce the regeneration energy requirement. A more efficient packing material, can greatly improve the pilot plant overall energy and mass transfer efficiency.
机译:基于化学反应的二氧化碳吸收是燃烧后二氧化碳捕获(PCC)的最有前途的技术之一。在开发节能和具有成本效益的PCC工艺方面已经做出了巨大的努力。鉴于PCC仍在作为一种技术日趋成熟,因此将继续需要中试规模的设备来支持过程优化,尤其是在能源效率方面。中试规模的PCC设施通常要比未来大型化石电厂中使用的规模小几个数量级,从而有可能以可承受的规模研究PCC过程的细节。但是,如果要有信心地使用这些数据来设想PCC工艺的未来大规模使用,尤其是在能耗方面,则中试规模研究必须提供可靠的数据,这一点至关重要。因此,本工作建立并通过实验验证(以代表性的中试工厂为例)程序,以分析中试规模的基于胺的CO2捕集厂的能源性能,重点是天然气燃烧应用。该研究严格评估了试点工厂的当前能源绩效,并提出了新的运行条件和系统修改,通过这些条件和试点,试点工厂将在能源消耗方面更加高效地运行。在适当的投入下,开发用于评估和改善PCC工艺的能源性能的方法学适用于使用30 wt%水溶液的其他此类工厂。 %的单乙醇胺(MEA)溶液作为溶剂。基于速率的燃烧后二氧化碳捕集过程模型,使用的是30 wt。 %MEA作为溶剂在AspenPlus®V.8.4中开发,并使用英国碳捕集与封存研究中心/中试先进捕集技术(UKCCSRC / PACT)中试厂进行的实验研究结果进行了验证,代表性的中试规模捕获工厂,并用于参数敏感性研究。在给定的稀溶剂CO2负载范围内,已经确定并改变了几个参数,以评估它们对试验工厂能源需求的影响。使用总当量工作原理确定最佳的贫溶剂CO2装载量。结果表明,对于给定的包装材料类型,可以通过优化汽提塔的工作压力来实现大部分节能。在某种程度上,汽提塔入口处较高的溶剂温度有可能降低再生能量的需求。一种更高效的包装材料,可以大大提高中试厂的整体能量和传质效率。

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