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Process evaluation of an 865 MW_e lignite fired O_2/CO_2 power plant

机译：865 MW_e褐煤燃烧的O_2 / CO_2电厂的工艺评估

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摘要

In order to reduce emissions of carbon dioxide from large point sources, new technologies can be used in capture plants for combustion of fossil fuel for subsequent capture and storage of CO_2. One such technology is the O_2/CO_2 combustion process (also termed oxy-fuel combustion) that combines a conventional combustion process with a cryogenic air separation process so that the fuel is burned in oxygen and recycled flue gas, yielding a high concentration of CO_2 in the flue gas, which reduces the cost for its capture. In this work, the O_2/CO_2 process is applied using commercial data from an 865 MW_e lignite fired reference power plant and large air separation units (ASU). A detailed design of the flue gas treatment pass, integrated in the overall process layout, is proposed. The essential components and energy streams of the two processes have been investigated in order to evaluate the possibilities for process integration and to determine the net efficiency of the capture plant. The electricity generation cost and the associated avoidance cost for the capture plant have been determined and compared to the reference plant with investment costs obtained directly from industry. Although an existing reference power plant forms the basis of the work, the study is directed towards a new state of the art lignite fired O_2/CO_2 power plant. The boiler power of the O_2/CO_2 plant has been increased to keep the net output of the capture and the reference plant similar. With the integration possibilities identified, the net efficiency becomes 33.5%, which should be compared to 42.6% in the reference plant. With a lignite price of 5.2 $/ MW h and an interest rate of 10%, the electricity generation cost increases from 42.1 to 64.3 $/MW h, which corresponds to a CO_2 avoidance cost of 26 $/ton CO_2.
机译：为了减少大量排放源的二氧化碳排放，可以在捕集工厂中使用新技术来燃烧化石燃料，以用于随后的CO_2捕集和存储。一种这样的技术是O_2 / CO_2燃烧过程（也称为氧燃料燃烧），该过程将常规燃烧过程与低温空气分离过程结合在一起，从而使燃料在氧气和循环烟道气中燃烧，从而在燃烧室中产生高浓度的CO_2。烟气，降低了捕集成本。在这项工作中，使用来自865 MW_e褐煤的参考电厂和大型空分装置（ASU）的商业数据应用O_2 / CO_2工艺。提出了烟气处理通道的详细设计，并将其整合到整个过程布局中。为了评估过程集成的可能性并确定捕集装置的净效率，已经研究了这两个过程的基本组成部分和能量流。已经确定了捕集电厂的发电成本和相关的避免成本，并将其与参考电厂进行了比较，并直接从行业获得了投资成本。尽管现有的参考电厂构成了工作的基础，但该研究针对的是一种新型的褐煤燃烧O_2 / CO_2电厂。 O_2 / CO_2工厂的锅炉功率已增加，以使捕集装置和参考工厂的净输出保持相似。确定集成可能性后，净效率将变为33.5％，应与参考工厂的42.6％相比。褐煤价格为5.2美元/兆瓦时，利率为10％，发电成本从42.1美元/兆瓦时增加到64.3美元/兆瓦时，这相当于避免CO_2成本为26美元/吨CO_2。

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