期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
Experiment Study on the Exhaust-Gas Heat Exchanger for Small and Medium-Sized Marine Diesel Engine
1
作者 Li Luo Yuhang Fan +3 位作者 Yu Wang Peiyong Ni Xuewen Zhang Guannan Xi 《Energy Engineering》 EI 2023年第1期125-145,共21页
This paper aims to design a special exchanger to recover the exhaust gas heat of marine diesel engines used in small and medium-sized fishing vessels,which can then be used to heat water up to 55°C–85°C for... This paper aims to design a special exchanger to recover the exhaust gas heat of marine diesel engines used in small and medium-sized fishing vessels,which can then be used to heat water up to 55°C–85°C for membrane desalination devices to produce fresh water.A new exhaust-gas heat exchanger of fins and tube,with a reinforced heat transfer tube section,unequal spacing fins,a mixing zone between the fin groups and four routes tube bundle,was designed.Numerical simulations were also used to provide reference information for structural design.Experiments were carried out for exhaust gas waste heat recovery from a marine diesel engine in an engine test bench utilizing the heat exchanger.The experimental results show that the difference between heat absorption by water and heat reduction of exhaust gas is less than 6.5%.After the water flow rate was adjusted,the exhaust gas waste heat recovery efficiency was higher than 70%,and the exhaust-gas heat exchanger’s outlet water temperature was 55°C–85°C at different engine loads.This means that the heat recovery from the exhaust gas of a marine diesel engine meets the requirement to drive a membrane desalination device to produce fresh water for fishers working in small and medium-sized fishing vessels. 展开更多
关键词 Marine diesel engine exhaust gas waste heat recovery heat exchanger flow field simulation experimental analysis
下载PDF
Design and optimization of exhaust gas aftertreatment system for a heavy-duty diesel engine 被引量:1
2
作者 TAN Pi-qiang YAO Chao-jie +3 位作者 WANG De-yuan ZHU Lei HU Zhi-yuan LOU Di-ming 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第7期2127-2141,共15页
Diesel engines meeting the latest emission regulations must be equipped with exhaust gas aftertreatment system,including diesel oxidation catalysts(DOC),diesel particulate filters(DPF),and selective catalytic reductio... Diesel engines meeting the latest emission regulations must be equipped with exhaust gas aftertreatment system,including diesel oxidation catalysts(DOC),diesel particulate filters(DPF),and selective catalytic reduction(SCR).However,before the final integration of the aftertreatment system(DOC+DPF+SCR)and the diesel engine,a reasonable structural optimization of the catalytic converters and a large number of bench calibration tests must be completed,involving large costs and long development cycles.The design and optimization of the exhaust gas aftertreatment system for a heavy-duty diesel engine was proposed in this paper.Firstly,one-dimensional(1D)and threedimensional(3D)computational models of the exhaust gas aftertreatment system accounting for the structural parameters of the catalytic converters were established.Then based on the calibrated models,the effects of the converter’s structural parameters on their main performance indicators,including the conversion of various exhaust pollutants and the temperatures and pressure drops of the converters,were studied.Finally,the optimal design scheme was obtained.The temperature distribution of the solid substrates and pressure distributions of the catalytic converters were studied based on the 3D model.The method proposed in this paper has guiding significance for the optimization of diesel engine aftertreatment systems. 展开更多
关键词 diesel engine EMISSION exhaust gas aftertreatment computational model optimal design
下载PDF
Optimization and Evaluation of a Vehicular Exhaust Heat Recovery System
3
作者 Meng Zhao Mingshan Wei 《Journal of Beijing Institute of Technology》 EI CAS 2018年第4期527-534,共8页
Exhaust waste heat recovery system based on organic Rankine cycle(ORC)has been considered as an effective method to achieve energy conservation and emissions reduction of engine.The performance of adiesel engine with ... Exhaust waste heat recovery system based on organic Rankine cycle(ORC)has been considered as an effective method to achieve energy conservation and emissions reduction of engine.The performance of adiesel engine with an on-board ORC exhaust heat recovery system was evaluated through simulations in this study.The combined system was optimized through controlling the exhaust gas mass flow rate entering the ORC system.The models of the engine with ORC system were developed in GT-suite and Simulink environment.The validation results showed high accuracy of the models.The performance of the system recovering heat from different exhaust gas mass flow rates was evaluated.The comparative analysis of the performance between the optimized and un-optimized system was also presented.The results indicated that the exhaust gas mass flow rate had significant effects on the system performance.Integration with the onboard ORC system could effectively improve the engine power performance.The power output of the engineORC combined system with optimization had further improvement,and the maximum improvement could reach up to 1.16 kW. 展开更多
关键词 diesel engine exhaust gas organic Rankine cycle(ORC) OPTIMIZATION
下载PDF
Influence of Exhaust Gas Recirculation on Low-Load Diesel Engine Performance 被引量:2
4
作者 CHENG Wenming LI Xianghu YI Xing 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2017年第5期443-448,共6页
In the condition of constant speed and light load, an experimental study of a turbocharged and intercooled diesel engine with exhaust gas recirculation (EGR) system focuses on the influence of different EGR rates on... In the condition of constant speed and light load, an experimental study of a turbocharged and intercooled diesel engine with exhaust gas recirculation (EGR) system focuses on the influence of different EGR rates on combustion process, dynamic performance, economic performance and emission performance of a diesel engine. With the increase of EGR rate, the oxygen concentration of the intake-side decreases, the fuel air equivalence ratio increases, and the maximum explosion pressure in the cylinder decreases. Meanwhile, the average temperature in the cylinder drops, the ignition delay is prolonged, the ignition timing delays, and the maximum heat release rate decreases. The increase of EGR rate makes NOx emissions decrease obviously and continue to decline. When EGR is low, the smoke rate enlarges slowly with the increase of EGR rate, and enlarges greatly at the rate higher than 43% and reaches the maximum at the rate of 57%. When EGR rate is higher than 61%, the smoke rate drops rapidly, and the content of CO and hydrocarbon (HC) increases rapidly with high EGR rate. 展开更多
关键词 exhaust gas recirculation (EGR) diesel engine PERFORMANCE
原文传递
Simulation of VGT control based on charge oxygen concentration
5
作者 安晓辉 张付军 +1 位作者 刘波澜 崔涛 《Journal of Beijing Institute of Technology》 EI CAS 2014年第2期172-177,共6页
A turbocharged diesel engine model was built with the GT-Power software,and experimentally verified.Then two different control variables for the control of the variable geometry turbocharger(VGT)were described,and t... A turbocharged diesel engine model was built with the GT-Power software,and experimentally verified.Then two different control variables for the control of the variable geometry turbocharger(VGT)were described,and their distinct effects on engine performance,i.e.NOxand soot emissions and fuel consumption,were simulated and compared on the basis of this model.The results showed that NOxemissions decreased obviously with the increase of exhaust gas recirculation(EGR)rate at constant boost pressure condition,but soot emissions and fuel consumption considerably increased.It was a good way to reduce NOxemissions without increasing fuel consumption and soot emissions when VGT was controlled to maintain the excess oxygen ratio unchanged as EGR rate increases. 展开更多
关键词 diesel engine exhaust gas recirculation(EGR) variable geometry turbocharger(VGT) engine control oxygen concentration
下载PDF
柴油机尾气净化装置中利用微波加热再生技术的研究 被引量:6
6
作者 许益存 浦甲辰 +2 位作者 许钰龙 熊树生 楚书华 《农机化研究》 北大核心 2007年第1期215-217,共3页
目前,柴油机尾气净化装置是一种有效的柴油车微粒排放后处理技术,它与高压喷射等机内净化技术一起将成为柴油车满足严格法规要求的主要技术手段。柴油机尾气净化装置涉及的一个难题就是适时地清除沉积在净化装置中的碳烟微粒,也就是对... 目前,柴油机尾气净化装置是一种有效的柴油车微粒排放后处理技术,它与高压喷射等机内净化技术一起将成为柴油车满足严格法规要求的主要技术手段。柴油机尾气净化装置涉及的一个难题就是适时地清除沉积在净化装置中的碳烟微粒,也就是对净化装置“再生”,以防止排气不畅使柴油机性能恶化。为此,利用微波加热技术对实现再生的可行性进行了研究,其最大技术特点是高效、快捷,为更好地发展柴油机尾气净化装置提供参考。 展开更多
关键词 能源与动力工程 柴油机尾气排放微粒 试验 微波加热特性 燃烧转化
下载PDF
Transient emission simulation and optimization o turbocharged diesel engine 被引量:1
7
作者 Lingge SUI Zhongchang LIU +1 位作者 Yongqiang HAN Jing TIAN 《Frontiers in Energy》 SCIE CSCD 2013年第2期237-244,共8页
In order to alleviate the pressure of experi- mental research of turbocharged diesel engine under transient operations, a whole process simulation platform for turbocharged diesel engine under transient operations was... In order to alleviate the pressure of experi- mental research of turbocharged diesel engine under transient operations, a whole process simulation platform for turbocharged diesel engine under transient operations was established based on the multi-software coupling technologies of Matlab/Simulink, GT-Power, STAR-CD and artificial neural network. Aimed at the contradiction of NOx and soot emission control with exhaust gas recirculation (EGR) of turbocharged diesel engine under transient operations, on this simulation platform, a transient EGR valve control strategy was proposed, which adjusted the EGR valve in adjacent level based on the feedback of its opening according soot control limit under transient operations. Simulation and experimental results prove that the transient emission optimization effect of this control strategy is obvious. On the one hand, compared with the previous control strategy, which closed the EGR valve during the whole transient operations, soot emission is slightly increased by 9.5%, but it is still 9% lower than the control limit. On the other hand, compared with the previous control strategy, NOx transient emission is reduced by 44%. 展开更多
关键词 diesel engine transient simulation EMISSION control strategy exhaust gas recirculation (EGR)
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部