Waste heat utilization using organic rankine cycle from a pressurized pulverized combined cycle power plant

IF 1.2 4区工程技术 Q3 ENGINEERING, MECHANICAL Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy Pub Date : 2024-03-19 DOI:10.1177/09576509241240013

Nitesh Kumar Choudhary, Goutam Khankari, Sujit Karmakar

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Abstract

Power plants release a massive amount of waste heat at very low temperatures. Posing a challenge for efficient conversion into useful work through conventional methods. By selecting appropriate working fluids, low-grade power cycles can solve this problem by converting waste heat to electricity. The present work dealt with waste heat utilization using the Organic Rankine Cycle (ORC) from a 400 MWe coal based supercritical Pressurized Pulverized Combined Cycle (PPCC). The working fluid for the ORC is the refrigerant R245fa. High-ash (HA) Indian coal and low-ash (LA) South African coal are used as fuel to assess the plant’s ability to produce electricity under ambient conditions in India. The simulation flowsheet program “Cycle-Tempo” models and simulates different plant layouts. The thermodynamic assessment unveiled that the standalone plant has energy and exergy efficiencies of 43.46% and 39.87% for HA & 45.42% and 43.84% for LA, respectively. According to this study, the proposed plant has energy and exergy efficiencies of 44.63% and 40.94% for HA & 46.69% and 45.07% for LA, respectively. Moreover, using ORC, the waste heat generates additional electricity of 9.38 MWe, with an energy efficiency of 12.92% and exergy efficiency of 34.63%.

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利用加压粉煤联合循环发电厂的有机秩循环利用余热

发电厂在极低的温度下释放出大量废热。这给通过传统方法将废热有效转化为有用功带来了挑战。通过选择适当的工作流体，低品位动力循环可将余热转化为电能，从而解决这一问题。本研究利用有机郎肯循环（ORC）对 400 MWe 煤基超临界加压粉化联合循环（PPCC）中的废热进行利用。ORC 的工作流体是制冷剂 R245fa。高灰分（HA）印度煤和低灰分（LA）南非煤被用作燃料，以评估发电厂在印度环境条件下的发电能力。模拟流程图程序 "Cycle-Tempo "对不同的发电厂布局进行了建模和模拟。热力学评估结果表明，独立发电厂的能量效率和放能效率分别为：HA &amp 43.46% 和 39.87%；LA 45.42% 和 43.84%。根据这项研究，拟议的发电厂在 HA 和 LA 方面的能源效率和放能效率分别为 44.63% 和 40.94%；在 HA 和 LA 方面的能源效率和放能效率分别为 46.69% 和 45.07%。此外，利用 ORC，余热可产生 9.38 MWe 的额外电力，能源效率为 12.92%，放能效率为 34.63%。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 工程技术-工程：机械

CiteScore

3.30

自引率

5.90%

发文量

114

审稿时长

5.4 months

期刊介绍： The Journal of Power and Energy, Part A of the Proceedings of the Institution of Mechanical Engineers, is dedicated to publishing peer-reviewed papers of high scientific quality on all aspects of the technology of energy conversion systems.