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Experimental Investigation on Heat Transfer and Combustion of a Stirling Engine Combustor Fueled by Reformed Gas and Diesel Fuel

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Journal of Thermal Science 2024年第5期33卷 1907-1919页

作者： LAN Jian ZHAO Yanchun LIN Guangtao LI Yelin REN Zhe LYU Tian SHEN Mengmeng GU Genxiang HAN Dong key laboratory for Power Machinery and Engineering Ministry of EducationShanghai Jiao Tong UniversityShanghai200240China Shanghai Marine Diesel Engine Research Institute Shanghai 201108China

Thermochemical recuperation heat recovery is an advanced waste heat utilization technology that can effectively recover exhaust waste heat from oxy-fuel Stirling *** novel combustor of a Stirling engine with thermochemical recuperation heat recovery system is expected to utilize both reformed gas and diesel fuels as sources of *** this research,the effects of various factors,including the H_(2)O addition,fuel distribution ratio(FDR),excess oxygen coefficient,and cyclone structure on the temperature distribution in the combustor,combustion emissions,and external combustion system efficiency of the Stirling engine were experimentally *** the increase of steam-to-carbon ratio(S/C),the temperature difference between the upper and lower heating tubes reduces and the circumferential temperature fluctuation decreases,and the combustion of diesel and reformed gas remains close to complete *** S/C=2,the external combustion efficiency is 80.6%,indicating a 1.6%decrease compared to conventional *** the increase of FDR,the temperature uniformity of the heater tube is improved,and the CO and HC emissions ***,the impact of the FDR on the maximum temperature difference and temperature fluctuation across the heater is *** the FDR rises from 21%to 38%,the external combustion efficiency increases from 87.4%to92.3%.The excess oxygen coefficient plays a secondary role in influencing temperature uniformity and temperature difference,and the reformed gas and diesel fuel can be burned efficiently at a low excess oxygen coefficient of *** an increase in the cyclone angle,the heater tube temperature increases,while the maximum temperature difference at the lower part decreases,and the temperature fluctuation ***,the CO and HC emissions increase,and the external combustion efficiency experiences a decrease.A cyclone angle of 30°is found to be an appropriate value for achieving optimal

关键词： Stirling engine fuel reforming synthetic gas oxy-combustion external combustion efficiency

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Waste heat recovery and denitrification of flue gases from gas-fired boilers

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Science China(Technological Sciences) 2016年第12期59卷 1874-1881页

作者： ZHAO Yan ZHU Xiao Lei MENG Ji An LI Zhi Xin Thermal Research Institute Tianjin UniversityTianjin300072China Beijing Yuanshen Energy Saving technology Co.Ltd. BeijingChina key laboratory of Thermal Science and Power Engineering of ministry of education School of Aerospace Tsinghua UniversityBeijing 100084China

A waste heat recovery and denitrification system was developed for improving energy conservation and emissions control especially for control of PM2.5 particles and haze. The system uses enhanced heat and mass transfer techniques in a packed heat exchange tower with self-rotation and zero-pressure spraying, low temperature NO oxidation by ozone, and neutralization with an alkali solution. Operating data in a test project gave NOx in the exhaust flue gas of less than 30 mg/Nm3 with an ozone addition rate of 8 kg/h and spray water p H of 7.5–8, an average heat recovery of 3 MW, and an average heat supply of 7.2 MW.

关键词： flue gas waste heat recovery denitrification ozone oxidation of NO neutralization with alkali solution heat pump

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Optimizing the exhaust system of Marine Diesel Engines to Improve Low-speed Performances and Cylinder Working Conditions

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Fluid Dynamics & Materials Processing 2021年第4期17卷 683-695页

作者： Sheng Liu Ling Leng Wenjie Zhou Lei Shi Science and technology on Diesel Engine Turbocharging laboratory China North Engine Research InstituteTianjin300400China key laboratory for Power Machinery and Engineering of ministry of education College of Mechanical and Power EngineeringShanghai Jiaotong UniversityShanghai200240China

Proper design of exhaust systems in marine high-power turbocharged diesel engines can contribute to improve the low-speed performance of these engines and make the working conditions of the cylinders more *** a high-power marine 16-cylinder V-type turbocharged diesel engine is simulated using the GT-Power soft*** results reveal the differences induced by different exhaust system structures,such as an 8-cylinder-inpipe exhaust system with single/double superchargers and a 4-cylinder-in-pipe exhaust system with a single *** a comparative analysis,the 8-cylinder type with double superchargers is determined to be the optimal solution,and the structure of the exhaust system is further *** simulations show that the optimized maximum exhaust temperature difference among cylinders is reduced by 66%.Finally,the simulation results and the optimized performance of the designed exhaust system are verified through experiments.

关键词： exhaust system low-speed performance cylinder uniformity diesel engine

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Uniformity and energy evaluation of equal cross-section ventilation system(ECVS)for long tunnel in underground buildings

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Energy and Built Environment 2022年第1期3卷 86-94页

作者： Qi Deng Huaican Liu Yecong He Tengjin Huang Huan Zhou Ying Bao State key laboratory of Air-conditioning Equipment and system Energy Conservation China

Uniform ventilation is important for the safety of long tunnel in underground buildings,it is difficult to install the large size air duct to ensure the centerline of each cross-section of the traditional variable cross-section ventila-tion system(VCVS)superimposed on the same horizontal axis,which is significant to the ventilation uniformity,energy consumption and installation convenience of the *** the contrary,each cross-section of the Equal Cross-section Ventilation system(ECVS)has the same horizontal axis,therefore,it is more convenient to manu-facture and install the large size air duct in the underground long tunnel and achieve uniform *** study proposes an ECVS,using computational fluid dynamics(CFD)numerical simulation analyzed the influences of main duct velocity,aspect ratio,and outlet numbers on uniformity and energy consumption per unit air vol-ume(ECPV).It revealed that when each ventilation equalizer’s valve Angle𝛽is given,uniformity of air supply decreases slightly with an increase in the inlet *** the air supply main duct aspect ratio increases,the outlet velocity standard deviation range is from 0.22 to *** outlet numbers N=7~12 and𝛽are constant,air supply uniformity and resistance coefficient𝜉also decrease with the decrease of outlet *** outlet number has a significant influence on the uniformity of system air supply,main duct velocity,and aspect ratio are relatively *** is positively correlated with the main duct velocity and outlet number,and is negatively correlated with aspect ratio.

关键词： Ventilation equalizer Equal cross-section ventilation system(ECVS) Energy consumption per unit air volume(ECPV) Uniform air supply Resistance coefficient

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Influence of flue gas cleaning system on characteristics of PM_(2.5)emission from coal-fired power plants

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International Journal of Coal Science & technology 2014年第1期1卷 4-12页

作者： Ao Wang Qiang Song Gongming Tu Hui Wang Yong Yue Qiang Yao key laboratory for Thermal Science and Power Engineering of ministry of education Department of Thermal EngineeringTsinghua UniversityBeijing 100084China

This study investigated the influence of precipitators and wet flue gas desulfurization equipment on characteristics of PM_(2.5)emission from coal-fired power *** measured size distribution and removal efficiencies,including hybrid electrostatic precipitator/bag filters(ESP/BAGs)which have rarely been studied.A bimodal distribution of particle concentrations was observed at the inlet of each *** the precipitators,particle concentrations were significantly *** a bimodal distribution was still observed,all peak positions shifted to the smaller *** removal efficiencies of hybrid ESP/BAGs reached 99%for PM_(2.5),which is considerably higher than those for other types of *** particular,the influence of hybrid ESP/BAG operating conditions on the performance of dust removal was *** efficiency of hybrid ESP/BAGs decreased by 1.9%when the first electrostatic field was shut *** concentrations and distributions of particulate matter were also measured in three coal-fired power plants before and after desulfurization *** results showed diverse removal efficiencies for different desulfurization *** reason for the difference requires further *** estimated the influence of removal technology for particulate matter on total emissions in *** ESPs with hybrid ESP/BAGs could reduce the total emissions to 104.3 thousand tons,with 47.48 thousand tons of PM_(2.5).

关键词： Coal-fired power station Precipitation PM_(2.5) Emission characteristics Electrostatic precipitator ESP/BAG

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SEEPAGE ABILITY OF HIGH-PRESSURE HOT COMPOSITE FOAM IN POROUS MEDIA

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Journal of Hydrodynamics 2010年第1期22卷 90-95页

作者： WANG Ke-liang LIANGShou-cheng YUAN Xin-qiang CHEN Jin-feng The key laboratory of Enhanced Oil and Gas Recovery of the ministry of education Daqing Petroleum Institute Daqing 163318 China College of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China The Second Oil Production Company of Daqing Oilfield Company Ltd. Daqing 163414 China

The technology of hot composite foam displacement refers to the injection of high-temperature flue gas and foaming and stabilizing agent into wells with a certain concentration, and after meeting the formation water, a composite foam system is formed in the reservoir. This foam displacement technology involves thermal function and so is related to nitrogen, carbon dioxide and foam flooding characteristics. After analyzing seepage flow law of hot composite foam system, seepage flow experiment of composite foam under high pressure was conducted, and seepage flow ability of hot composite foam in porous media was investigated. In the experiment, surfactant HY-3 was chosen as the foaming agent and hot flue gas was chosen as the foaming gas, and high-pressure hot foaming apparatus was employed in experiments. The experimental results indicate that the surfactant HY-3 could form stable foam in porous media, and the foam has strong ability of plugging. It is concluded that the sealing performance of foam is improved with increasing permeability and resistance coefficient and with incresing injection rate and foam strength. After foam injection, sealing characteristics of heterogeneous cores is better than that of homogeneous cores. The foam pressure has a process of transmission in porous media. In this process, with the increase of injection volume, pressure from the inlet to the outlet increases gradually, which indicates that stable foam has been formed inside the core.

关键词： composite foam surfactant HY-3 seepage flow under high pressure porous media

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Flow control characteristics of the digital and mechanical redundancy control electric modulation valve

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第8期23卷 599-609页

作者： He LIU Bin ZHAO Bo WANG Long QUAN Yun-xiao HAO Yun-wei LI key laboratory of Advanced Transducers and Intlligent Control system of ministry of education and Shanxi Province Taiyuan University of TechnologyTaiyuan 030024China Deparment of Electrical and Computer Engineering University of AlbertaEdmonton ABT6G1H9Canada

The electrical modulation valve can provide proportional output valve element displacement,flow,or pressure according to a continuously changing input electrical *** is the core component of electro-hydraulic proportional control *** remove the influence of pressure difference changes on the output flow,the traditional scheme is to use a pressure compensation valve,which increases the difficulty of both manufacturing and maintaining the *** solve this problem,a method of digital and mechanical redundancy control flow is *** sensors are installed at the inlet and outlet of the valve,and the controller adjusts the displacement of the valve element according to the pressure difference between the valve ports to realize high-precision control of the flow.A pressure compensation valve is installed in front of the valve,and a three-way solenoid valve is used to control the working of the compensation *** the case of sensor failure,the valve is switched to the mechanical compensation differential pressure mode,to control the flow and to achieve redundancy *** system security is thereby *** feasibility of this scheme is verified through simulation and *** results show that,both for digital compensation and mechanical compensation,the output flow can be kept constant when the pressure difference changes,and the system has good static and dynamic *** principle can be applied to the displacement-flow feedback type electrical modulation valve,and can realize accurate control of the flow of the pilot valve and,finally,accurate control of the flow in the main valve.

关键词： Electrical modulation valve Control characteristics Co-simulation Redundancy control

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Airflow distribution law of multi-branch pipe of pneumatic rice direct seeder based on dimensional analysis

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International Journal of Agricultural and Biological Engineering 2023年第1期16卷 111-127页

作者： Wei Qin Zaiman Wang Minghua Zhang Siyu He Xuguo Wang Youcong Jiang Zishun Huang Ying Zang Guangdong laboratory for Lingnan Modern Agriculture College of EngineeringSouth China Agricultural UniversityGuangzhou510642China key laboratory of key technology on Agricultural Machine and Equipment(South China Agricultural University) Ministry of EducationGuangzhou 510642China Guangdong Provincial key laboratory of Agricultural Artificial Intelligence(GDKL-AAI) Guangzhou 510642China Huangpu Innovation Research Institute of SCAU Guangzhou 510715China Maoming Branch Guangdong Laboratory for Modern AgricultureMaoming 525000GuangdongChina

In order to investigate the flow characteristics and distribution law of airflow in multi-branch pipe of pneumatic rice precision direct seeder and obtain the mathematical model between airflow parameters and pipe geometry *** this study,the airflow flow law of the multi-branch pipeline of the pneumatic system was studied,the mechanism of airflow flow in the multi-branch pipe was analyzed,and it was clarified that the main factors affecting the airflow flow in the pipe,namely,air density,air dynamic viscosity,the total flow rate of the inlet branch pipe,the length of the closed end of the header,the inner diameter of the outlet branch pipe,and the outlet branch pipe *** simulations were carried out using Fluent simulation software to elucidate the cause of multi-branch pipes of uneven distribution of airflow in multi-branch pipes,the empirical equation among these factors and the flow velocity of the outlet branch pipe are established by dimensional analysis *** bench test results show that the established empirical equations are applicable in the following ranges:0.018 m3/s≤Q≤0.054 m3/s,0.045 m≤d≤0.05 m,0.075 m≤L≤0.125 m,0.7 m≤Y 1≤0.875 m(0.5 m≤Y 2≤0.75 m,0.36 m≤Y 3≤0.45 m),the prediction accuracy can be controlled within 10%of the empirical formula,which can provide a reference for the prediction and optimization design of outlet velocity of the multi-branch pipe.

关键词： pneumatic system multi-branch pipe axial momentum conservation Fluent dimensional analysis

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Experimental research and numerical simulation of the thermal performance of a tube-fin cold energy storage unit using water/modified expanded graphite as the phase change material

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Energy Storage and Saving 2022年第2期1卷 71-79页

作者： Jinxin Feng Ziye Ling Jiangchang Huang Xiaoming Fang Zhengguo Zhang key laboratory of Enhanced Heat Transfer and Energy Conservation The Ministry of EducationSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou510640China Guangdong Engineering technology Research Center of Efficient Heat Storage and Application South China University of TechnologyGuangzhou510640China

In this study,experimental and numerical investigations were conducted on a tube-fin heat-exchanger latent-heat cold energy storage *** fin side of the heat exchanger was filled with water as the energy storage medium,and modified expanded graphite(MEG)was employed to improve the thermal characteristics of *** water contact angle of the expanded graphite decreased from 106.31°to 0°,and the hydrophilicity and the absorption rate of water significantly improved after the ***,the experimental analyses of the charge/discharge process showed that the cooling capacity of the system filled with 90 wt.%water/MEG was 80.8%of that of pure water,whereas its cooling time was only 69.7%of that of pure *** average power increased by 15.9%compared with that of *** system filled with 90 wt.%water/MEG completed two energy charging and discharging cycles,whereas the system filled with water completed only 1.5 cycles within 15000 ***,the effects of the flow rate and inlet temperature of the heat transfer fluid on the charging process were ***,a numerical model was built and validated to investigate the phase change behavior and the effect of the structure size on the performance of the *** heat-exchanger fin spacing had no significant effect on the cold energy storage unit,whereas the vertical spacing of the tube pass had the highest *** can be concluded that the heat exchanger combined with high-thermal-conductivity water/MEG exhibits better energy storage capacity and working power,showing a wide application prospect in the field of cold energy storage.

关键词： Cold energy storage Tube-fin heat exchanger Phase change material Water Modified expanded graphite

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Thermodynamic and Economic Studies of a Combined Cycle for Waste Heat Recovery of Marine Diesel Engine

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Journal of Thermal Science 2022年第2期31卷 417-435页

作者： ZHANG Xinxin CAO Min HE Maogang WANG Jingfu MOE key laboratory of enhanced heat transfer and energy conservation Beijing University of TechnologyBeijing 100124China Beijing key laboratory of heat transfer and energy conversion Beijing University of TechnologyBeijing 100124China MOE key laboratory of Thermo-Fluid Science and Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi’an 710049China

In the present study,the thermodynamic and economic performance of a combined thermodynamic cycle formed by an ORC and a Kalina cycle,which can simultaneously recover waste heat of exhaust gas and cooling water of marine engine,has been *** typical marine engines are selected to be the waste heat *** economic indicators are used to analyze the economic performance of this combined thermodynamic cycle system with different marine engine load and under practical comprehensive operating condition of marine *** results of the present study show that the combined thermodynamic cycle system with R123 as organic working fluid has the best *** system with cis-butene has the worst economic *** practical comprehensive operating conditions of ships,R123 has the shortest Payback Periods,which are 8.51 years and 8.14 years for 8 S70 ME-C10.5 engine and 5G95 ME-C10.5 engine,***,payback Periods of Cyclopentane are 11.95 years and 11.90 *** above values are much shorter than 25 years which are the lifetime of a marine *** practical comprehensive operating conditions of ships,the combined cycle system can provide output power which is at least equivalent to 25%of engine *** that R123 will be phased out in near future,cyclopentane may be its good *** can be used safely by correct handling and installing according to manufacturer's instructions.

关键词： marine engine waste heat recovery combined thermodynamic cycle thermodynamic and economic study R123 cyclopentane

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