Bio-Energy with CCS (BECCS) performance evaluation: Efficiency enhancement and emissions reduction
Bio-Energy with CCS (BECCS) performance evaluation: Efficiency enhancement and emissions reduction
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DOI：
10.1016/j.apenergy.2017.03.063
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发表时间：
2017-06-01
期刊：
影响因子：
11.2
通讯作者：
Mac Dowell, Niall
中科院分区：
文献类型：
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作者：
Bui, Mai;Fajardy, Mathilde;Mac Dowell, Niall
在本研究中，我们评估了利用胺基二氧化碳捕集技术从粉状燃料发电厂的发电厂锅炉系统中回收废热的可行性。根据燃料类型和溶剂选择，回收的热量可以提供高达 100% 的溶剂再生所需热量，从而无需从发电厂蒸汽循环中抽出蒸汽，并显着降低二氧化碳捕获过程对发电厂造成的效率损失。在研究燃烧过程的热化学时，观察到与低水分生物质共燃比单独燃烧煤获得了更高的绝热火焰温度（AFT）。随着生物质混烧比例的增加，SOx 的形成和排放量减少，而 NOx 排放量则随着 AFT 的变化而变化。 500 MW 50% 混烧 BECCS 系统的发电效率从使用传统 MEA 溶剂的 31%(HHV) 提高到使用高性能捕获溶剂的 34%(HHV)。本文描述的热回收方法使高性能溶剂的效率进一步提高至 38%(HHV)。研究发现，这样的系统每年可在 90% 的容量系数下从大气中去除 0.83 Mt(CO2)。 (C) 2017 Elsevier Ltd. 保留所有权利。
In this study we evaluate the feasibility of the recovery of waste heat from the power plant boiler system of a pulverised fuel power plant with amine-based CO2 capture. This recovered heat can, as a function of fuel type and solvent selection, provide up to 100% of the heat required for solvent regeneration, thus obviating the need for withdrawing steam from the power plant steam cycle and significantly reducing the efficiency penalty imposed upon the power plant by the CO2 capture process. In studying the thermochemistry of the combustion process, it was observed that co-firing with low moisture biomass achieved higher adiabatic flame temperatures (AFT) than coal alone. The formation and emission of SOx reduced as biomass co-firing proportion increased, whereas NOx emissions were observed to be a function of AFT. The power generation efficiency of a 500 MW 50% co-firing BECCS system increased from 31%(HHV) with a conventional MEA solvent, to 34%(HHV) with a high performance capture solvent. The heat recovery approach described in this paper enabled a further efficiency increase up to 38%(HHV) with the high performant solvent. Such a system was found to remove 0.83 Mt(CO2) from the atmosphere per year at 90% capacity factor. (C) 2017 Elsevier Ltd. All rights reserved.