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Experimental Study of H_(2)and/or N_(2)Addition Effects on CO/CO_(2)-Air flames using a Combustion Diagnostic System

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Journal of Thermal Science 2021年第4期30卷 1268-1277页

作者： LIU Yu XUE Qingguo ZUO Haibin SHE Xuefeng WANG Jingsong State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

In this work,the effects of H_(2)(0–8 vol%)addition,N_(2)(0–8 vol%)addition,and H_(2)/N_(2)(4 vol%/4 vol%)addition in CO/CO_(2)gas flow on the flame structure,flame temperature,and CO_(2)concentration in flames were investigated.A combustion diagnostic system based on tunable diode laser absorption spectroscopy(TDLAS)was utilized to measure the flame temperature and CO_(2)concentration in flames *** work simulated the combustion of converter gas(CO/CO_(2)/H_(2)/N_(2))in an industrial turbulent partly premixed *** results show that with the addition of H_(2)(0–8 vol%)in CO/CO_(2)flame and the addition of H_(2)(4 vol%)in CO/CO_(2)/N_(2)(4vol%)flame,the flame length is longer than that with the same volume addition of N_(2).The added reactions caused by the addition of H_(2)(4 vol%)in CO/CO_(2)flame and CO/CO_(2)/N_(2)(4 vol%)flame result in a larger high-temperature reaction *** enrichment of H_(2)(8 vol%)in CO/CO_(2)/H_(2)(4 vol%)flame,the dilution of N_(2)(0–8 vol%)in CO/CO_(2)flame,and the dilution of N_(2)(4 vol%)in CO/CO_(2)/H_(2)(4 vol%)flame make little difference on the high-temperature reaction *** promotion effects of H_(2)addition on CO_(2)formation are more prominent than the dilution effects of N_(2)addition on CO_(2)concentration in flames.

关键词： H_(2)and/or N_(2)addition flame length flame temperature CO_(2)concentration

Numerical study of effects of hydrogen addition on methane combustion behaviors

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Journal of Iron and Steel Research International 2023年第11期30卷 2173-2185页

作者： Dian-yu E Ling-yi Weng Guang-wu Tang Jing Li Guang-chao Wei Jia-xin Cui Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyNanchang330013JiangxiChina International Institute for Innovation Jiangxi University of Science and TechnologyNanchang330013JiangxiChina Shenzhen Smoore Technology Limited Shenzhen518102GuangdongChina ARC Research Hub for Computational Particle Technology Department of Chemical and Biological EngineeringMonash UniversityClaytonVIC3800Australia School of Transportation and Vehicle Engineering Shandong University of TechnologyZibo255000ShandongChina

The methane combustion with hydrogen addition can effectively reduce carbon emissions in the iron and steel making industry,while the combustion mechanism is still poorly *** oxy-fuel combustion of methane with hydrogen addition in a 0.8 MW oxy-natural gas combustion experimental furnace was numerically studied to investigate six different combustion *** results show that the 28-step chemical reaction mechanism is the optimal recommendation for the simulation balancing the numerical accuracy and computational *** the hydrogen enrichment increases in fuel,the highest flame temperature ***,the chemical reaction accelerates with enlarging the peak of the highest flame temperature and intermediate OH *** the hydrogen enrichment reaches 75 vol.%,the flame front is the farthest,and the flame high-temperature zone occupies the largest proportion corresponding to the most vigorous chemical reactions in the same oxygen supply.

关键词： Oxy-fuel combustion Hydrogen Combustion mechanism flame temperature Simulation Modeling

Effect of wall temperature and random distribution of micro organic dust particles on their combustion parameters

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Journal of Central South University 2015年第10期22卷 3888-3899页

作者： M.Bidabadi E.Yaghoubi M.Harati Gh.Shahryari B.Akhoondian Department of Mechanical Engineering Iran University of Science and Technology Combustion Research Laboratory

The effect of wall temperature on the characteristics of random combustion of micro organic particles with recirculation was investigated. The effect of recirculating in micro-combustors is noticeable, hence it is necessary to present a model to describe the combustion process in these technologies. Recirculation phenomenon is evaluated by entering the exhausted heat from the post flam zone into the preheat zone. In this work, for modeling of random situation at the flame front, the source term in the equation of energy was modeled considering random situation for volatizing of particles in preheat zone. The comparison of obtained results from the proposed model by experimental data regards that the random model has a better agreement with experimental data than non-random model. Also, according to the results obtained by this model, wall temperature affects the amount of heat recirculation directly and higher values of wall temperature will lead to higher amounts of burning velocity and flame temperature.

关键词： random combustion recirculation micro organic particle effective equivalence ratio flame temperature burning velocity

Investigation over the recirculation influence on the combustion of micro organic dust particles

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Applied Mathematics and Mechanics(English Edition) 2010年第6期31卷 685-696页

作者： M. BIDABADI A. FANAEE A. RAHBARI Department of Mechanical Engineering Iran University of Science and Technology

This paper investigates the role of recircnlation and non-unity Lewis number on the combustion of organic dust particles. Since recirculation effect is more noticeable in micro-combustors, it is necessary to propose a modeling approach of this phenomenon to better simulate the performance of micro-combustors. In this research, in order to model the combustion of organic dust particles, it is assumed that the dust particles va- porize first to yield a known chemical structure which is oxidized in the gas phase, and the chemical structure of this gaseous fuel is assumed methane. To study the flame structure and solve the governing equations, it is considered that the flame structure consists of three zones titled the preheat-vaporization zone, the narrow reaction zone and finally the post flame zone. The recirculation phenomenon is evaluated by entering the exhausted heat from the post flame zone into the preheat zone. The solution is based on the follow- ing approach. First, the governing equations in each zone are nondimensionalized. Then the needed boundary and matching conditions are applied in each zone. After that, these equations and the required boundary and matching conditions are simultaneously solved with the analytical model. Consequently, the remarkable effects of recirculation and non- unity Lewis number on the combustion characteristics of the organic dust particles such as burning velocity and temperature profiles for different particle radii are obtained. The results show reasonable agreement with published experimental data.

关键词： recirculation non-unity Lewis number organic dust particles flame temperature burning velocity

EXPERIMENTAL RESEARCH ON flame SPECTRA OF METHANE-COAL DUST EXPLOSIONS

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Acta Mechanica Sinica 1988年第4期4卷 378-386页

作者： Li Hongde Liu Yuzheng (Institute of Mechanics,Chinese Academy of Sciences)Liao Jiqing Xia Zizhu Li Shizhan (Chongqing Institute,Coal Academy of Sciences) 1. Institute of Mechanics Chinese Academy of Sciences Beijing China2. Chongqing Institute Coal Academy of Sciences Chongqing China

The significance of experimental research on flame spectra of methane-coal dust explosions *** explosions of *** dust-air mixtures were carried out in a large-scale tube of 200cm×2900cm with one end open,and the absolute radiation intensities as well as their variation underdifferent conditions for characteristic wavelengths of 0.8875,1.000,1.505,2.801,and 4.346μm were obtainedby using small angle of view and a multichannel detector developed by *** experimental results arediscussed and compared with those published *** on the absolute radiation intensity measured atwavelength 4.346μm and the selected ackbody radiation model,the temperature of explosion flame *** results obtained are not only of great practical importance to the industry but may also beused in the study of flame and chemical kinetics.

关键词： methane-coal dust explosion isolation muhichannel spectral detector characteristic spectra spectral radiation intensity flame temperature

A numerical investigation in buoyancy effects on micro jet diffusion flame

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Journal of Central South University 2020年第3期27卷 867-875页

作者： LIU Lei ZHAO Ming CHEN Yi-kun FAN Ai-wu LI Dan China Tabacco Hubei Industrial Limited Liability Company Wuhan 430014China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

The buoyancy effect on micro hydrogen jet flames in still air was numerially *** results show that when the jet velocity is relatively large(V≥0.2 m/s),the flame height,width and temperature decrease,whereas the peak OH mass fraction increases significantly under normal gravity(g=9.8 m/s^2).For a very low jet velocity(e.g.,V=0.1 m/s),both the peak OH mass fraction and flame temperature under g=9.8 m/s^2 are lower than the counterparts under g=0 m/s^*** reveals that when V≥0.2 m/s,fuel/air mixing will be promoted and combustion will be intensified due to radial flow caused by the buoyancy ***,the flame temperature will be slightly decreased owing to the large amount of entrainment of cold air into the reaction *** V=0.1 m/s,since the heat release rate is very low,the entrainment of cold air and fuel leakage from the rim of tube exit lead to a significant drop of flame ***,the heat loss rate from fuel to inner tube wall is larger under g=9.8 m/s^2 compared to that under g=0 m/s^***,the buoyancy effect is overall negative at very low jet velocities.

关键词： micro jet diffusion flame buoyancy effect flame structure flame temperature air entrainment preheating effect

Optimization of Flow Parameters for Waste Lubricating Oil Combustion

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World Journal of Engineering and Technology 2022年第4期10卷 875-894页

作者： Dorcas Makworo Robert Kiplimo Meshack Hawi Bernard Owiti Pan African University Institute for Basic Sciences Technology and Innovation Nairobi Kenya Department of Marine Engineering and Maritime Operation Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya Department of Mechanical Engineering Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya

The global energy demand has continued to skyrocket, exacerbating the already severe energy problem and environmental pollution, prompting researchers to look for alternative energy sources. Exploration of waste lubricating oil (WLO) as an alternative source of fuel has gained prominence among researchers due to its availability at low cost and the potential to generate energy while providing a safer means of disposal. The main challenge with WLO combustion is proper regulation of fuel and oxidizer during combustion to realize a near stoichiometric result. Additionally, WLO has high viscosity, hence preheating of the oil is necessary to lower the viscosity and enhance atomization, for a more efficient combustion process. This paper presents the optimization of flow parameters for combustion of WLO in a burner system by use of response surface methodology (RSM). The effects of air flow rate, injection pressure and fuel flow rate on combustion performance of a WLO burner were investigated. The highest flame temperature recorded was 1200°C at an air flow rate of 1 m3/min, fuel flow rate of 0.08 m3/hr and injection pressure of 20 bar. Tests on physical and chemical properties of WLO were conducted and characterized according to ASTM standard to ascertain its potential as an alternative fuel. The calorific values of WLO from petrol and diesel engines were found to be 41.23 MJ/kg and 42.65 MJ/kg respectively. Therefore, recycling of WLO by utilizing it as a fuel for burners has double benefits of mitigating environmental pollution and harnessing energy for process heating and power generation.

关键词： Waste Lubricating Oil Combustion Burner Optimization flame temperature Response Surface Methodology

Study on the laser irradiation characteristics of NEPE propellant in different oxygen concentrations

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Study on the laser irradiation characteristics of NEPE prope...

热电偶测量火焰温度与放热率分布特性的实验研究

激光聚变能源检测与驱动技术研讨会

作者：相恒升 Chen Xiong Zhou chang sheng School of Mechanical Engineering Nanjing University of Science & Technology

The ignition and combustion characteristics of NEPE propellant in different oxygen concentration ambient gases were studied by the application of CO2 laser,infrared thermometer and high speed *** flame intensity data of the propellant was collected by the photodiode;propellant flame temperature were measured by infrared *** experimental results show that the time which NEPE propellant spend to be stable combustion will get shorter with the increase of oxygen concentration;the flame peak temperature measured by infrared thermometer increases with the increase of oxygen concentration,when the oxygen concentration is less than 30% by volume,then decreases with the increase of oxygen concentration.

关键词： laser ignition NEPE propellant oxygen concentration flame temperature

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热电偶测量火焰温度与放热率分布特性的实验研究