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Process Analysis Of An Oxygen Lean Oxy-fuel Power Plant With Co-production Of Synthesis Gas

机译：联产合成气的贫氧制氧电厂工艺分析

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摘要

This paper investigates new possibilities and synergy effects for an oxy-fuel fired polygeneration scheme (transportation fuel and electricity) with carbon capture and co-firing of biomass. The proposed process has the potential to make the oxy-fuel process more effective through a sub-stoichiometric combustion in-between normal combustion and gasification, which lowers the need for oxygen within the process. The sub-stoichiometric combustion yields production of synthesis gas, which is utilised in an integrated synthesis to dimethyl ether (DME). The process is kept CO_2 neutral through co-combustion of biomass in the process. The proposed scheme is simulated with a computer model with a previous study of an oxy-fuel power plant as a reference process. The degree of sub-stoichiometric combustion, or amount of synthesis gas produced, is optimised with respect to the overall efficiency. The maximal efficiency was found at a stoichiometric ratio just below 0.6 with the efficiency for the electricity producing oxy-fuel process of 0.35 and a DME process efficiency of 0.63. It can be concluded that the proposed oxygen lean combustion process constitutes a way to improve the oxy-fuel carbon capture processes with an efficient production of DME in a polygeneration process.
机译：本文研究了利用氧燃料燃烧的多联产计划（运输燃料和电力）与碳捕获和生物质共烧的新可能性和协同效应。所提出的方法具有通过在正常燃烧和气化之间的亚化学计量燃烧来使含氧燃料过程更有效的潜力，这降低了该过程中对氧气的需求。亚化学计量燃烧产生合成气，该合成气用于与二甲醚（DME）的集成合成中。通过过程中生物质的共燃烧使过程保持CO_2中性。用计算机模型对提出的方案进行了仿真，并以对氧气燃料发电厂的先前研究作为参考过程。就总效率而言，优化了亚化学计量的燃烧程度或产生的合成气量。发现最大效率在化学计量比刚好低于0.6的情况下，用于发电的含氧燃料过程的效率为0.35，而DME过程的效率为0.63。可以得出结论，提出的贫氧燃烧过程构成了一种通过在多联产过程中高效生产DME来改善含氧燃料碳捕集过程的方法。

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