CSIRO Energy, 10 Murray Dwyer Circuit, Mayfield West, New South Wales 2304, Australia.
Department of Chemical Engineering, Curtin University of Technology Australia , GPO Box U1987, Perth, Western Australia 6845, Australia.
Environ Sci Technol. 2016 Oct 4;50(19):10746-10755. doi: 10.1021/acs.est.6b02737. Epub 2016 Sep 23.
Using a rigorous, rate-based model and a validated economic model, we investigated the technoeconomic performance of an aqueous NH-based CO capture process integrated with a 650-MW coal-fired power station. First, the baseline NH process was explored with the process design of simultaneous capture of CO and SO to replace the conventional FGD unit. This reduced capital investment of the power station by US$425/kW (a 13.1% reduction). Integration of this NH baseline process with the power station takes the CO-avoided cost advantage over the MEA process (US$67.3/tonne vs US$86.4/tonne). We then investigated process modifications of a two-stage absorption, rich-split configuration and interheating stripping to further advance the NH process. The modified process reduced energy consumption by 31.7 MW/h (20.2% reduction) and capital costs by US$55.4 million (6.7% reduction). As a result, the CO-avoided cost fell to $53.2/tonne: a savings of $14.1 and $21.9/tonne CO compared with the NH baseline and advanced MEA process, respectively. The analysis of energy breakdown and cost distribution indicates that the technoeconomic performance of the NH process still has great potential to be improved.
采用严格的基于速率的模型和经过验证的经济模型，我们研究了集成在 650MW 燃煤电厂中的水基 NH 基 CO 捕获工艺的技术经济性能。首先，我们探索了 NH 工艺的基线情况，同时对 CO 和 SO 进行了捕获，以替代传统的 FGD 装置。这使得电厂的资本投资减少了 42.5 美元/千瓦（减少了 13.1%）。将这个 NH 基线工艺与电厂集成，其 CO 减排成本比 MEA 工艺具有优势（67.3 美元/吨与 86.4 美元/吨）。然后，我们研究了两阶段吸收、富液分馏配置和加热汽提的工艺改进，以进一步推进 NH 工艺。改进后的工艺将能耗降低了 31.7MW/h（降低了 20.2%），并将资本成本降低了 5540 万美元（降低了 6.7%）。因此，CO 减排成本降至 53.2 美元/吨：与 NH 基线和先进的 MEA 工艺相比，分别节省了 14.1 美元和 21.9 美元/吨 CO。对能量分解和成本分布的分析表明，NH 工艺的技术经济性能仍有很大的改进空间。
