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A reduced combustion mechanism of ammonia/diesel optimized with multi-objective genetic algorithm

Defence Technology（防务技术） 2024年第4期34卷 187-200页

作者： Wanchen Sun Shaodian Lin Hao Zhang Liang Guo Wenpeng Zeng Genan Zhu Mengqi Jiang State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025China

For the deep understanding on combustion of ammonia/diesel,this study develops a reduced mechanism of ammonia/diesel with 227 species and 937 *** sub-mechanism on ammonia/interactions of N-based and C-based species(N—C)/NOx is optimized using the Non-dominated Sorting Genetic Algorithm II(NSGA-II)with 200 *** optimized mechanism(named as 937b)is validated against combustion characteristics of ammonia/methane(which is used to examine the accuracy of N—C interactions)and ammonia/diesel *** ignition delay times(IDTs),the laminar flame speeds and most of key intermediate species during the combustion of ammonia/methane blends can be accurately simulated by 937b under a wide range of *** for ammonia/diesel blends with various diesel energy fractions,reasonable predictions on the IDTs under pressures from 1.0 MPa to5.0 MPa as well as the laminar flame speeds are also achieved by *** particular,with regard to the IDT simulations of ammonia/diesel blends,937b makes progress in both aspects of overall accuracy and computational efficiency,compared to a detailed ammonia/diesel *** kinetic analysis reveals that the reaction pathway of ammonia during the combustion of ammonia/diesel blend mainly differs in the tendencies of oxygen additions to NH_2 and NH with different equivalence ratios.

关键词： Ammonia Diesel Combustion kinetic mechanism Multi-objective optimization

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Sol-gel approach to low-temperature synthesis of single-phase metastable La_(2)Ga_(3)O_(7.5) melilite with enhanced grain-boundary oxide ionic conductivity via a kinetically favorable mechanism

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Journal of Advanced Ceramics 2022年第10期11卷 1613-1625页

作者： Yuan ZHANG Longfei ZHAO Zhupeng YE Yanwei ZENG College of Materials Science and Engineering Nanjing Tech UniversityNanjing 211816China

Starting with the stoichiometric and highly homogeneous gel-precursor,single-phase metastable melilite La_(2)Ga_(3)O_(7.5),as the end-member of solid solution La_(1+x)Sr_(1−x)Ga_(3)O_(7+x/2)(0≤x≤1),has been synthesized by solid-state reaction at 700℃ for 2 h via a kinetically favorable mechanism and characterized by X-ray diffraction(XRD),Raman,X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),AC impedance spectroscopy,*** has been revealed that the as-synthesized melilite La_(2)Ga_(3)O_(7.5) shows an orthorhombic symmetry with crystal cell parameters a=11.4690(1)A,b=11.2825(4)A,and c=10.3735(4)A,while has more Raman active modes than LaSrGa_(3)O_(7) with a tetragonal structure,which was also synthesized under the same conditions for comparison,but tends to slowly decompose into perovskite LaGaO_(3) and Ga2O_(3) when annealed at 700℃ for over 20 h driven by its ***,the metastable La2Ga3O7.5 shows a higher XPS binding energy for the excess oxide ions in the crystal structure than those at normal lattice *** intrinsic grain oxide ion conductivity can reach as high as 0.04 and 0.51 mS·cm^(-1) at 550 and 700℃,respectively,characterized by a simple Arrhenius relationship ln(σT)-1/T with invariable activation energy,E_(a)=1.22 eV,over the temperature range from 300 to 700℃,along with an apparent grain boundary conductivity that is about double that from the grains thanks to the clean grain *** paper provides a new strategic approach to the synthesis of complex oxides that may be of high performance but are difficultly achieved by the conventional ceramic method at high temperatures.

关键词： melilite La_(2)Ga_(3)O_(7.5) low temperature synthesis gel-precursor meta-stability kinetic mechanism

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Prediction and measurement of pollutant emissions in CNG fired internal combustion engine

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Journal of Natural Gas Chemistry 2010年第5期19卷 539-547页

作者： M. Mansha A. R. Saleemt Javed S. H Badar M. Ghauri Department of Chemical Engineering University of Engineering ＆ Technology Lahore 5457 Pakistan Institute of Space Technology Islamabad 44000 Pakistan

In the present study, the detailed reaction mechanisms were developed and Chemkin 4.1.1 was implemented to predict the formation of pollutant species in compressed natural gas （CNG） fired internal combustion （IC） engine. The proposed mechanisms were developed by coupling the EXGAS （an automatic mechanism generation tool for alkane oxidation） mechanisms with the Leed＇s NOz mechanism （version 2.0）. The simulation results of each proposed mechanism were validated by the experimental measurements for profiles of temperature, pressure and pollutant species （CO, NOx）. The rate of production analysis of each mechanism identified the important reactions in each mechanism which contributed to the formation of pollutant species. In spite of some discrepancies, the experimental measurements indicate that mechanism-IV （consisting of 208 reactions and 78 species） showed closer agreement for each of the predicted profiles of temperature, pressure and pollutant species （CO, NOx）.

关键词： kinetic mechanism rate of production oxidation pollutant species

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Influence　of　RE　Addition　on　the　Synthesis　mechanism　of　Si3N4from　Silica　Reduction　by　Carbon　in　Nitrogen　Atmosphere

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Journal of Rare Earths 1996年第2期14卷 128-132页

作者：李文超庄又青孙贵如 University of Science and Technology Beijing Beijing 100083 China General Research Institute for Non-Ferrous Metals Beijing 100088 China

ＩｎｆｌｕｅｎｃｅｏｆＲＥＡｄｄｉｔｉｏｎｏｎｔｈｅＳｙｎｔｈｅｓｉｓＭｅｃｈａｎｉｓｍｏｆＳｉＮｆｒｏｍＳｉｌｉｃａＲｅｄｕｃｔｉｏｎｂｙＣａｒｂｏｎｉｎＮｉｔｒｏｇｅｎ　ＡｔｍｏｓｐｈｅｒｅＬｉＷｅｎｃｈａｏ(李文... 详细信息

ＩｎｆｌｕｅｎｃｅｏｆＲＥＡｄｄｉｔｉｏｎｏｎｔｈｅＳｙｎｔｈｅｓｉｓＭｅｃｈａｎｉｓｍｏｆＳｉＮｆｒｏｍＳｉｌｉｃａＲｅｄｕｃｔｉｏｎｂｙＣａｒｂｏｎｉｎＮｉｔｒｏｇｅｎ　ＡｔｍｏｓｐｈｅｒｅＬｉＷｅｎｃｈａｏ(李文超)；ＺｈｕａｎｇＹｏｕｑ...

关键词： RE oxide addition Si3N4 powder kinetic mechanism

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