Exergoeconomic study of reheat combined cycle configurations using steam and ammonia-water mixture for bottoming cycle parameters

IF 1.1 Q3 Engineering

Journal of Thermal Engineering Pub Date : 2023-10-17 DOI:10.18186/thermal.1376826

Mayank MAHESHWARI, Onkar SINGH

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引用次数: 0

Abstract

The use of combined cycle power plants though had led the pathway to maximize the fuel en-ergy utilization but the part-load operation of these plants is of concern. In this work, an exer-goeconomic comparison of 11 different reheat combined cycle arrangements hasbeen carried out under their part-load operations for varying bottoming cycle parametersnamely steam-bleedfraction, deaerator pressure,separator temperature, absorber pressure, and condenser pressure.The results depict that the absorber has the highest exergy destruction with second law efficiency of 23.55% at thepart load of 25% for the combined cycle power plant having high pressure drum with steam as working fluid and low pressure drum with ammonia-wa-ter as working fluid. The comparison also shows the highest cost of electricity production as 0.1243USD/kWh for the combined cycle power plant having ammonia-water as working fluid in bottoming cycle and operating at part load of 25%. While the minimum price of electricity produced is 0.05USD/kWh at 25% part load for CCPP having double pressure HRVG’s at condenser pressure of 0.09 bar.

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以蒸汽和氨水混合物为底循环参数的再热联合循环结构的运行经济性研究

联合循环电厂的使用虽然为燃料能源的最大化利用开辟了一条途径，但其部分负荷运行令人担忧。在这项工作中，对11种不同的再热联合循环安排进行了半负荷运行下的人工经济比较，并对不同的底循环参数(即放汽率、除氧器压力、分离器温度、吸收器压力和冷凝器压力)进行了比较。结果表明，对于以蒸汽为工质的高压转鼓和以氨水为工质的低压转鼓联合循环电厂，在部分负荷为25%时，吸收塔的火用破坏最高，第二定律效率为23.55%。以氨水为底循环工质、部分负荷25%运行的联合循环电厂的产电成本最高，为0.1243美元/千瓦时。而在冷凝器压力为0.09 bar时，双压HRVG的CCPP在25%部分负荷下的最低发电量为0.05美元/千瓦时。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Thermal Engineering THERMODYNAMICS-

CiteScore

2.40

自引率

18.20%

发文量

审稿时长

4 weeks

期刊介绍： Journal of Thermal Enginering is aimed at giving a recognized platform to students, researchers, research scholars, teachers, authors and other professionals in the field of research in Thermal Engineering subjects, to publish their original and current research work to a wide, international audience. In order to achieve this goal, we will have applied for SCI-Expanded Index in 2021 after having an Impact Factor in 2020. The aim of the journal, published on behalf of Yildiz Technical University in Istanbul-Turkey, is to not only include actual, original and applied studies prepared on the sciences of heat transfer and thermodynamics, and contribute to the literature of engineering sciences on the national and international areas but also help the development of Mechanical Engineering. Engineers and academicians from disciplines of Power Plant Engineering, Energy Engineering, Building Services Engineering, HVAC Engineering, Solar Engineering, Wind Engineering, Nanoengineering, surface engineering, thin film technologies, and Computer Aided Engineering will be expected to benefit from this journal’s outputs.