Exergy analysis in an HCCI engine powered with hydrogen enriched natural gas

IF 1.1 4区 工程技术 Q4 ENERGY & FUELS
Tawfiq Abdul Aziz Al Mughanam, Abdul Khaliq
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引用次数: 1

Abstract

HCCI combustion is a very promising technology as it provides low NOx and soot formations with high efficiency. In the present investigation, the performance of turbocharged HCCI engine operated with hydrogen enriched natural gas was assessed using exergy analysis. The impact of equivalence ratio, turbocharger pressure, atmospheric temperature, and hydrogen enrichment has been ascertained on the engine's energy and exergy efficiencies. Special attention is given to identification and quantification of irreversibility of combustion and heat transfer processes using the concept of entropy generation and exergy loss. It is demonstrated that combustion and heat transfer irreversibilities in HCCI engine can be reduced from 55% to 43.4% and its power output is augmented from 31.4% to 38.4% if natural gas is replaced with 100% hydrogen. Overall, the results of second law analysis for engine under consideration show that variations of operational parameters examined have considerably affected the exergy transfer, irreversibilities and efficiencies.
以富氢天然气为动力的HCCI发动机的火用分析
HCCI燃烧是一种非常有前途的技术,因为它能提供低氮氧化物和高效率的烟尘形成。在本研究中,采用火用分析方法评估了富氢天然气增压HCCI发动机的性能。确定了当量比、增压器压力、大气温度和氢气富集度对发动机能量和火用效率的影响。特别注意的是识别和量化的不可逆性的燃烧和传热过程使用的概念,熵的产生和火用损失。结果表明,采用100%氢气替代天然气后,HCCI发动机的燃烧不可逆性和传热不可逆性从55%降低到43.4%,输出功率从31.4%提高到38.4%。总的来说,第二定律分析的结果表明,所研究的发动机运行参数的变化对火用传递、不可逆性和效率有很大的影响。
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来源期刊
International Journal of Exergy
International Journal of Exergy 物理-能源与燃料
CiteScore
2.10
自引率
15.40%
发文量
107
审稿时长
6 months
期刊介绍: IJEX is dedicated to providing an interdisciplinary platform for information and ideas in the field of exergy and thermodynamic optimisation. It publishes a wide range of original, high-quality research papers, and ancillary features, spanning activities from fundamental research to industrial applications. IJEX covers aspects of exergy analysis of engineering and non-engineering systems and processes in a large variety of disciplines, ranging from mechanical engineering to physics and chemical engineering to industrial ecology. Topics covered include: -Thermodynamic systems -Energy-related applications -Process optimisation -Energy systems, policies, planning -Exergy/environment modelling -Exergetic life cycle assessment -Industrial ecology -Sectoral exergy utilisation -Waste exergy emissions -Second-law efficiency -Thermo- and exergo-economics -Exergy in sustainable development -Criticisms of and problems with use of exergy -Entropy generation minimisation -Constructal theory and design
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