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Coupling effect on the thermal hazard assessment of hazardous chemical materials via calorimetric technologies and simulation approaches

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Defence Technology（防务技术） 2024年第2期32卷 644-654页

作者： Yabei Xu Jiankun Shao Wei Wang Shengliang Xu Dongping Chen State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Science and Technology on Aerospace Chemical Power Laboratory Hubei Institute of Aerospace ChemotechnologyXiangyang 441003China

The coupling effect of heat absorption and release exists in the thermal decomposition of a few chemical ***,the impact of the above coupling on thermal hazard assessment is not considered in the literature *** this work,nitroguanidine(NQ)and 1,3,5-trinitro-1,3,5-triazine(RDX)are selected as representative materials to explore the influence of the coupling effect on the thermal hazard assessment of chemical *** linear heating experiments of NQ and RDX are carried out by a microcalorimeter and synchronous thermal *** thermal decomposition curves are decoupled by advanced thermokinetics *** thermal decomposition and kinetic parameters before and after decoupling are *** results of TG experiment show that both NQ and RDX began to lose mass during the endothermic *** endothermic melting and exothermic decomposition of NQ and RDX are coupled within this *** coupling effect has different degrees of influence on its initial decomposition temperature and safety *** with the parameters in the coupling state,the initial decomposition temperature and adiabatic induction period after decoupling *** self-accelerating decomposition temperature increases,and internal thermal runaway time *** the thermal hazard assessment of chemical materials with coupling effects,the calculated parameters after decoupling should be taken as an important safety index。

关键词： Calorimetric technologies Kinetics thermal hazard Phase transformation thermal decomposition

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Studies on the flame propagation characteristic and thermal hazard of the premixed N2O/fuel mixtures

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Defence Technology（防务技术） 2020年第3期16卷 564-570页

作者： Yu-yan Li Rong-pei Jiang Zhi-peng Li Sen Xu Feng Pan Li-feng Xie School of Chemical Engineering Nanjing University of Science and TechnologyNanjingJiangsu 210094PR China Beijing Insitute of Aerospace Testing Technology Beijing Key Laboratory of Research and Application for Aerospace Green PropellantsBeijing 100074PR China National Quality Supervision and Inspection Center for Industrial Explosive Materials NanjingJiangsu 210094PR China

An experimental study was carried out to investigate the flame propagation and thermal hazard of the premixed N2O/fuel mixtures,including NH3,C3H8 and *** study provided the high speed video images and data about the flame locations,propagation patterns,overpressures and the quenching diameters during the course of combustion in different channels to elucidate the dynamics of various combustion *** onset decomposition temperature was determined using high-performance adiabatic *** was shown that the order of the flame acceleration rate and thermal hazard was N2O/C2H4>N2O/C3H8>N2O/NH3.

关键词： Flame propagation Flame acceleration rate Quenching diameter thermal hazard

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thermal hazard analysis of two imidazolium nitrate ionic liquids using thermal analysis techniques

Thermal hazard analysis of two imidazolium nitrate ionic liq...

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中国化学会第七届全国热分析动力学与热动力学学术会议

作者： Shang-Hao Liu Bin Zhang Yi-Ming Lu State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and Technology(AUST) School of Chemical Engineering AUST

In essence,ionic liquids(ILs) are salts with melting points at or below 100 ℃,which are composed of organic cations and organic or inorganic *** to their distinctive properties,such as low melting point,wide liquid range,extremely low vapor pressure,sound thermal stability and wide electrochemical windows etc.,ILs are used in a number of application categories.1-Butylimidazolium nitrate [Bim]NO and 1,3-dimethylimidazolium nitrate [Mmim]NO,two typical ILs,can be used to activate copper nanoparticles for CO ***,imidazole nitrate may lead to disasters or other serious hazard problems if the cooling system fails or operates at the incorrect process ***,it is necessary to further investigate the thermal stability of [Bim]NO and [Mmim]NO before *** aim of this research was to investigate the thermal hazards of [Bim]NO and [Mmim]NO by simultaneous thermogravimetric analyzer(STA),high pressure differential scanning calorimetry(HP DSC),vent sizing package 2(VSP2),gas chromatography/mass spectrometerand(GC/MS),fourier transform infrared spectrometer(FTIR),and flash point analyzer(FPA).The results indicated that both [Bim]NO and [Mmim]NO would be decomposed at the temperature significantly lower than the onset decomposition ***,high pressure would change the reaction *** the other hand,under the adiabatic condition,[Bim]NO and [Mmim]NO would decompose violently,resulting in the occurrence of runaway *** to the results,the decomposition products contain a large amount of flammable gas,making two ILs flammable.

关键词： Ionic liquid thermal hazard thermal decomposition Runaway reaction

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Permafrost Thaw and Associated Settlement hazard Onset Timing over the Qinghai-Tibet Engineering Corridor

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International Journal of Disaster Risk Science 2015年第4期6卷 347-358页

作者： Donglin Guo Jianqi Sun Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of Sciences

In permafrost areas, the timing of thermal surface settlement hazard onset is of great importance for the construction and maintenance of engineering *** permafrost thaw and the associated thermal settlement hazard onset timing in the Qinghai-Tibet engineering corridor(QTEC) were analyzed using high-resolution soil temperature data from the Community Land Model version4 in combination with multiple model and scenario soil temperature data from the fifth phase of the Coupled Model Intercomparison Project(CMIP5). Compared to the standard frozen ground map for the Tibetan Plateau and ERAInterim data, a multimodel ensemble reproduces the extent of permafrost and soil temperature change in the QTEC at a 1 m depth from 1986–2005. Soil temperature and active layer thickness increase markedly during 2006–2099 using CMIP5 scenarios. By 2099, the ensemble mean soil temperature at 15 m depth will increase between 1.0 and 3.6 ℃ in the QTEC. Using crushed-rock revetments can delay the onset of thermal settlement hazard for colder permafrost areas by approximately 17 years in the worst case scenario of RCP8.5. Nearly one-third of the area of the QTEC exhibits settlement hazard as early as 2050, and half of this one-third of the area is traversed by the QinghaiTibet highway/railway, a situation that requires more planning and remedial attention. Simulated onsets of thermal settlement hazard correspond well to the observed soil temperature at 15 m depth for seven grid areas in the QETC, which to some extent indicates that these timingestimates are reasonable. This study suggests that climate model-based timing estimation of thermal settlement hazard onset is a valuable method, and that the results are worthy of consideration in engineering design and evaluation.

关键词： hazard onset timing Permafrost QinghaiTibet railway thermal hazard

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