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Improved combustion stability of biogas at different CO_(2) concentrations using inhomogeneous partially premixed stratified flames

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Global Energy Interconnection 2024年第4期7卷 486-502页

作者： Mohy Saad Mansour Maged Kiriakos Lili Hao Mohamed Amr Serag-Eldin Mechanical Power Engineering Department Cairo University1 Gamaa StreetCairo Governorate 12613Egypt Mechanical Engineering Department The American University in CairoAUC AveCairo Governorate 11835Egypt College of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816P.R.China

biogas is a renewable and clean energy source that plays an important role in the current environment of lowcarbon *** high-content CO_(2) in biogas can be separated,transformed,and utilized,it not only realizes high-value utilization of biogas but also promotes carbon reduction in the biogas *** improve the combustion stability of biogas,an inhomogeneous,partially premixed stratified(IPPS)combustion model was adopted in this *** thermal flame structure and stability were investigated for a wide range of mixture inhomogeneities,turbulence levels,CO_(2) concentrations,air-to-fuel velocity ratios,and combustion energies in a concentric flow slot burner(CFSB).A fine-wire thermocouple is used to resolve the thermal flame *** flame size was reduced by increasing the CO_(2) concentration and the flames became lighter *** flame temperature also decreased with increase in CO_(2) *** stability was reduced by increasing the CO_(2) ***,at a certain level of mixture inhomogeneity,the concentration of CO_(2) in the IPPS mode did not affect the ***,the IPPS mode of combustion should be suitable for the combustion and stabilization of *** should support the design of highly stabilized biogas turbulent flames independent of CO_(2) *** data show that the lower stability conditions are partially due to the change in fuel combustion energy,which is characterized by the Wobbe index(WI).In addition,at a certain level of mixture inhomogeneity,the effect of the WI on flame stability becomes dominant.

关键词： biogas Renewable energy Effect of CO_(2) Combustion stability Burner design Renewable fuels Partial premixed

Numerical Simulation of Turbulent Diffusion Flames of a biogas Enriched with Hydrogen

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Fluid Dynamics & Materials Processing 2024年第1期20卷 79-96页

作者： Naima Krarraz Amina Sabeur Khadidja Safer Ahmed Ouadha Laboratoire des Science et Ingénierie Maritimes Facultéde Génie MécaniqueUniversitédes Sciences et de la Technologie d’Oran Mohamed BoudiafOranAlgérie Laboratoire des Carburants Gazeux et de l’Environnement Facultéde Génie MécaniqueUniversitédes Sciences et de la Laboratoire des Carburants Gazeux et de l’Environneme

Any biogas produced by the anaerobic fermentation of organic materials has the advantage of being an environmentally friendly ***,the relatively low calorific value of such gases makes their effective utilization in practical applications relatively *** present study considers the addition of hydrogen as a potential solution to mitigate this *** particular,the properties of turbulent diffusion jet flames and the related pollutant emissions are investigated numerically for different operating *** related numerical simulations are conducted by solving the RANS equations in the frame of the Reynolds Stress Model in combination with the flamelet *** effects are also taken into account and the combustion kinetics are described via the GRI-Mech 3.0 reaction *** considered hydrogen fuel enrichment spans the range from 0%to 50%in terms of *** varies between 1 and 10 *** results show that both hydrogen addition and pressure increase lead to an improvement in terms of mixing quality and have a significant effect on flame temperature and *** also reduce CO_(2) emissions but increase NOx *** NO is shown to be the predominant NO formation mechanism.

关键词： biogas hydrogen diffusion flame turbulence NO formation route pressure

Influence of H_(2)S and NH_(3) on biogas dry reforming using Ni catalyst:a study on single and synergetic effect

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 63-74页

作者： Yuchen Gao Jianguo Jiang Yuan Meng Tongyao Ju Siyu Han School of Environmental Science and Engineering Tiangong UniversityTianjin 300387China School of Environment Tsinghua UniversityBeijing 100084China

biogas is a renewable biomass energy source mainly composed of CH4 and CO_(2).Dry reforming is a promising technology for the high-value utilization of *** impurity gases in biogas can not be completely removed after pretreatment,which may affect the performance of dry *** this study,the influence of typical impurities H_(2)S and NH_(3) on dry reforming was studied using Ni/MgO *** results showed that low concentration of H_(2)S in biogas could cause serious deactivation of *** results including EDS,XPS and TOF-SIMS confirmed the adsorption of sulfur on the catalyst surface,which was the cause of catalyst *** used air calcination method to regenerate the sulfur-poisoned catalysts and found that the regeneration temperature higher than 500℃could help catalyst recover the original ***_(3)in the concentration range of 50–10000 ppm showed a slight inhibitory effect on biogas dry *** decline rate of biogas conversion efficiency increased with the increase of NH_(3) *** was related to the reduction of oxygen activity on catalyst surface caused by NH_(3).The synergetic effect of H_(2)S and NH_(3)in biogas was *** results showed that biogas conversion decreased faster under the coexistence of H_(2)S and NH_(3)than under the effect of H_(2)S alone,so as the surface oxygen activity of *** calcination regeneration could also recover the activity of the deactivated catalyst under the synergetic effect of H_(2)S and NH_(3).

关键词： biogas Dryreforming Suifur poisoning Ammonia Synergetic effect Hydrogen

N_(2)and Ar dilution on the premixed biogas jet flame under external acoustic enforcement

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Propulsion and Power Research 2023年第4期12卷 486-504页

作者： Bugrahan Alabas Ilker Yılmaz YakupÇam Department of Aeronautical Engineering Faculty of Aeronautics and AstronauticsErciyes UniversityKayseri 38039Turkey Department of Energy Systems Engineering Faculty of TechnologyGazi UniversityAnkara 06560Turkey Department of Aircraft Maintenance and Repair Faculty of Aeronautics and AstronauticsErciyes UniversityKayseri 38039Turkey

In this study,combustion instabilities and flue gas emission changes under different dilutions of N_(2)(nitrogen)and Ar(argon)of a promising biogas mixture(70%CH4-30%CO_(2))in the fight against greenhouse gas emissions were *** the experiments,additions were made from 0%to 50%at intervals of 10%for both *** order to detect the instability of the flame,external acoustic enforcements at different frequencies was applied through the speakers placed in the combustion chamber *** dynamic pressure fluctuation values were *** results showed that low dilution ratios were effective in reducing flame instability for both inert ***,as the dilution ratio increased,the fuel/air mixture became leaner and blowoff *** the case of comparing two different gases,it has been observed that the effect of argon gas on reducing dynamic pressure fluctuation is *** outlet temperature and brightness values of the flame decreased in both Ar and N_(2)*** and NOx emissions increased with increasing diluent volume for all dilution *** the emissions of the two diluent gases are compared,the CO emission,which was 3134 ppm in the undiluted condition,increased up to 4949 ppm in 50%Ar dilution,while it increased to 4521 ppm in 50%N_(2)dilution.

关键词： biogas Combustion instabilities Pollutant emissions Gas turbine combustor Dilution

biogas charging and dissipating process and its accumulation in the Sebei gasfield,Qaidam Basin,China

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Science China Earth Sciences 2008年第S1期51卷 36-44页

作者： JIN Qiang 1,CHENG FuQi 1,2 ,SU AiGuo 3 ,ZHU GuangYou 3 ,WANG Li 1 &CAO Qian 1 1 China University of Petroleum,Dongying,Shandong 257061,China 2 Geological Institute of Shengli Oilfield,SINOPEC,Dongying,Shandong 257015,China 3 Petroleum Exploration and Development Institute,PetroChina,Beijing 100083,China China University of Petroleum Dongying China Geological Institute of Shengli Oilfield SINOPEC Dongying China Petroleum Exploration and Development Institute PetroChina Beijing China

The Sebei gasfield is the largest biogas accumulation found in China and many reservoirs and seal rocks superposed on a syndepositional anticline in *** biogas charging and dissipating process and its distribution have been a research focus for many *** authors suggest a diffusing and accumulating model for the biogas,as they find that the shallower the gas producer,the more methane in the biogas,and the lighter stable carbon isotope composition of *** on the diffusing model,diffused biogas is quantitatively estimated for each potential sandy reservoir in the gasfield,and the gas charging quantity for the sandy reservoir is also calculated by the diffused gas quantity plus gas reserve in-place.A ratio of diffusing quantity to charging quantity is postulated to describe biogas accumulating state in a sandy reservoir,if the ratio is less than 0.6,the reservoir forms a good gas-pool and high-production layer in the gasfield,which often occurs in the reservoirs deeper than 900 m;if the ratio is greater than 0.6,a few gas accumulated in the reservoir,which frequently exists in the reservoirs shallower than 900 ***,a biogas accumulation model is built up as lateral direct charging from gas source for the sands deeper than 900 m and indirect charging from lower gas-bearing sands by diffusion at depth shallower than 900 *** this charging and diffusion quantitative model,the authors conducted re-evaluation on each wildcat in the central area of the Qaidam Basin,and found many commercial biogas layers.

关键词： biogas charging and diffusing model relative dissipated quantity Qaidam Basin

biogas recovery from microwave heated sludge by anaerobic digestion

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Science China(Technological Sciences) 2010年第1期53卷 144-149页

作者： QIAO Wei1,WANG Wei2,ZHU CuiPing3 & ZHANG ZhongZhi1 1 College of Chemical Science and Engineering,China University of Petroleum,Beijing 102249,China 2 Department of Environmental Science and Engineering,Tsinghua University,Beijing 10084,China 3 J & K China Cleaning Energy Technology Co.Ltd.,Beijing 100085,China College of Chemical Science and Engineering China University of Petroleum Beijing China Department of Environmental Science and Engineering Tsinghua University Beijing China J & K China Cleaning Energy Technology Co. Ltd. Beijing China

biogas generated from sewage sludge,livestock waste,and food waste by anaerobic digestion is a valuable renewable energy ***,conventional anaerobic digestion is not an efficient process.A long hydraulic retention time and low biogas recovery rate hinder the applications of those *** effective pretreatment method to destroy sludge microbial cells has been one of the major concerns regarding improvement of the biogas *** article focuses on the effects of microwave heating on sludge anaerobic *** suspended solid(VSS) and chemical organic demand solubilization of heated sludge were *** heating was found to be a rapid and efficient process for releasing organic substrates from *** increase of organic dissolution ratio was not obvious when holding time was over 5 min with microwave *** effect of the VSS solubilization was primarily dependent on heating *** highest value of VSS dissolving ratio,36.4%,was obtained at 170°C for 30 *** COD dissolving ratio was about 25% at 170°*** organic carbon of treated sludge liquor was 1.98 and 2.73 g/L at 150°C and 170°C for 5 min,respectively.A biochemical methane potential(BMP) test of excess sludge and a mixture of primary and excess sludge demonstrated an increase in biogas *** total biogas from microwave treated mixture sludge increased by 12.9% to 20.2% over control after 30 days of *** production was 11.1% to 25.9% higher for excess sludge than for untreated *** VS removal ratios of mixture sludge and excess sludge were 12% and 11% higher,respectively,compared to the untreated sludge.

关键词： biogas recovery microwave heating sludge anaerobic digestion

Adaptive Control System for biogas Power Plant Using Model Predictive Control

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Journal of Modern Power Systems and Clean Energy 2021年第5期9卷 1193-1204页

作者： Samaa Fawzy Mohammed Saeed Abdelfattah Eladl Magdi El-Saadawi Electrical Engineering Department Mansoura UniversityMansouraEgypt

This paper presents an adaptive control system using model predictive control for a biogas-fueled power *** control scheme is derived from an anaerobic digestion model that includes the concentration of biodegradable volatile solid in the reactor,the concentration of volatile solid in influent,the concentration of acidogens,and the concentration of *** these concentrations are the state variables of model predictive *** whole biogas-fueled power system has been modeled,implemented,and tested in MATLAB/Simulink *** validate the performance of the proposed controller,different operation conditions are studied and *** simulation results prove the effectiveness and the applicability of the proposed control system under different operating conditions.

关键词： Anaerobic digestion micro-turbine model predictive control state space biogas

The relationships among sCOD, VFAs, microbial community, and biogas production during anaerobic digestion of rice straw pretreated with ammonia

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Chinese Journal of Chemical Engineering 2020年第1期28卷 286-292页

作者： Xiaoyu Zuo Hairong Yuan Akiber Chufo Wachemo Xitong Wang Liang Zhang Juan Li Hongliang Wen Jiaxi Wang Xiujin Li Department of Environmental Science and Engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Department of Water Supply and Environmental Engineering Arba Minch UniversityP.O.Box 21Arba MinchEthiopia

This study investigated the effects of soluble chemical oxygen demand(s COD),volatile fatty acids(VFAs),and microbial community on biogas production in the process of rice straw(RS)anaerobic digestion(AD).The results showed that the s COD concentrations and VFA production appeared the same trend,which was inversely related with that of daily biogas *** cumulative methane yield of RS was 194.9 ml·(g VS)^-1·^-*** modified Gompertz model is the best fit for measured methane yields of RS in the three kinetic models of first-order kinetic,Cone and modified ***,Bacteroidetes,and Euryarchaeota were the dominant microbial phyla throughout AD *** the genus level,the microorganisms mainly composed of Clostridium,Vadin,Terrisporobacter,Methanosaeta,Methanobacterium,and *** showed strong relationship with s COD and VFA *** and Terrisporobacter displayed relationship with biogas ***,in order to improve the stability of the AD system,the parameter changes of VFAs,s COD,and biogas yield were monitored in the RS AD *** study can provide theoretical basis for improving the efficiency of RS AD.

关键词： Rice straw biogas Kinetic Anaerobic digestion Microbial community

Dehydration of natural gas and biogas streams using solid desiccants:a review

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1050-1074页

作者： Soheil Bahraminia Mansoor Anbia Esmat Koohsaryan Research Laboratory of Nanoporous Materials Faculty of ChemistryIran University of Science and Technology16846-13114TehranIran

Natural gas and biogas are two mixtures that consist of methane as their main *** two gas mixtures are usually saturated with water vapor,which cause many problems,such as damaging the gas processing equipment by increasing the gas’s corrosion potential or clogging the pipelines due to gas hydrate ***,removing water vapor from these gas streams is *** this review paper,the main dehydration methods have been overviewed,and scrutiny of the adsorption dehydration has been carried ***,the most important solid desiccants and their improvements have been reviewed.

关键词： natural gas biogas dehydration adsorption solid desiccant