Simulation and Optimization of A Dual-loop Organic Rankine Cycle-Onboard Carbon Capture System for LNG-powered Ships

IF 9.7 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Wenzhong Gao, Huiwen Zheng, Yuan Zhang, Zhen Tian, Junjie Zhou, Xi Jin
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Abstract

A dual-loop organic Rankine cycle-onboard carbon capture system (DORC-OCCS) for liquid natural gas (LNG) -powered ships is proposed to satisfy both objectives of carbon emission reduction and efficient energy utilization for ships. In this system, the wasted heat from the ship powers the reboiler and drives the high-temperature ORC to generate electricity. Simultaneously, LNG cold energy is utilized to liquefy the captured CO2 while also driving the low-temperature ORC. The effects of liquid-to-gas ratios (L/G), exhaust gas flow rates (mEG), and absorber packing heights (Habs) on the heat and mass transfer, thermodynamics, and economic performance of the system are investigated. The working conditions to accomplish ideal thermodynamic performance and economic benefits are determined through multi-objective optimization. The results show that: the carbon capture rate tends to be stabilized at the L/G ratio of 1.2, and the total capture cost is the lowest. Increasing mEG negatively impacts carbon capture rate, net output power, and exergy efficiency. As Habs increases, both the total capture cost and payback period are reduced. At the optimal working conditions (L/G =0.91, mEG =35,210 kg/h, Habs =10 m), DORC-OCCS obtains a carbon capture rate of 90.56% and a net output power of 305 kW. Meanwhile, the energy and exergy efficiencies are 53.71% and 17.88%, respectively, resulting in a total capture cost of 89.62 $/tCO2 and a payback of 9.30 years. Compared to a conventional OCCS and an OCCS with a single-stage ORC, DORC-OCCS exhibits superior overall performance. The related study provides a framework for future research and industrialized application of carbon capture technology in marine emissions.
lng动力船舶双回路有机朗肯循环-船载碳捕集系统仿真与优化
为满足船舶碳减排和能源高效利用的双重目标,提出了一种用于液化天然气(LNG)动力船舶的有机朗肯循环-船载碳捕集系统(DORC-OCCS)。在这个系统中,来自船舶的废热为再沸器提供动力,并驱动高温ORC发电。同时,LNG冷能被用来液化捕获的二氧化碳,同时也驱动低温ORC。研究了液气比(L/G)、废气流速(mEG)和吸收塔填料高度(Habs)对系统传热传质、热力学和经济性能的影响。通过多目标优化,确定了达到理想热力性能和经济效益的工况。结果表明:碳捕集率趋于稳定在L/G比为1.2时,总捕集成本最低;增加mEG会对碳捕获率、净输出功率和能源效率产生负面影响。随着Habs的增加,总捕获成本和投资回收期都缩短了。在最佳工作条件下(L/G =0.91, mEG = 35210 kg/h, Habs =10 m), DORC-OCCS的碳捕集率为90.56%,净输出功率为305 kW。同时,能源效率和火用效率分别为53.71%和17.88%,总捕集成本为89.62美元/tCO2,投资回收期为9.30年。与传统OCCS和单级ORC OCCS相比,DORC-OCCS表现出更优越的综合性能。相关研究为碳捕集技术在海洋排放中的未来研究和工业化应用提供了框架。
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来源期刊
Journal of Cleaner Production
Journal of Cleaner Production 环境科学-工程:环境
CiteScore
20.40
自引率
9.00%
发文量
4720
审稿时长
111 days
期刊介绍: The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.
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