Waste heat recovery assessment of triple heat-exchanger usage for ship main engine pre-heating and fresh water generation systems

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-08-30 DOI:10.1177/14750902231194794

Köksal Çolak, H. Ölmez, Betul Sarac

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引用次数: 0

Abstract

In this study, the applicability, fuel saving and CO2 emission reducing potential of the triple heat-exchanger fed by the diesel generator exhaust gas with and without water steam have been studied for ship’s one and two main engines pre-heating and freshwater generation (FWG) cycles under port conditions with conducting energy and exergy analysis. The performance criteria (PC) and exergy efficiency (ε) values of the main engine pre-heating and freshwater generator systems of the Ro-Ro ship selected for the case study were determined by written Matlab 2021a codes merging CoolProp 6.4.2 database with Python. It was determined that even at the lowest operating load of the diesel generator (25%), the exhaust heat energy would be sufficient to preheat the main engine and generating fresh water with also saving fuel consumption. As a result, during the 12-h port period, each 1 kW heat energy reduction on steam will provide 0.0853 kg/h fuel saving in the boiler. Thus, 273 kg CO2 emission will be reduced for each kW of heat energy to be obtained. Considering the comparatively increased PC and ε values of whole system cycle containing common triple heat-exchanger for two main engines, it can be used conveniently and reliably on ships.

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船舶主机预热和淡水发电系统三联热交换器余热回收评价

本研究通过进行能量和火用分析，研究了船用一、两台主机预热和淡水发电(FWG)循环在港口工况下柴油机废气有汽和无汽两种工况下的适用性、节油和CO2减排潜力。通过将CoolProp 6.4.2数据库与Python结合编写Matlab 2021a代码，确定了所选滚装船主机预热系统和淡水发电系统的性能标准(PC)和火用效率(ε)值。经确定，即使在柴油发电机最低运行负荷(25%)下，余热也足以预热主机并产生淡水，同时节省燃料消耗。因此，在12h的港口期间，每减少1kw的蒸汽热能，将为锅炉节省0.0853 kg/h的燃料。因此，每获得一千瓦的热能将减少273公斤的二氧化碳排放。考虑到双主机通用三联换热器全系统循环的PC值和ε值相对提高，在船舶上使用方便、可靠。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.