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卤烃灭火介质在灭火过程中,受热分解产生的HF不仅对火灾现场的设备具有严重的腐蚀现象,而且对灭火现场的人员存在严重的伤害,故HF的生成量问题一直是卤烃灭火介质评价的重要性能指标之一.一溴三氟丙烯(简称BTP)作为可降解卤烃的一种,被认为是具有重大应用潜力的新一代“哈龙”替代技术,然而,目前对于BTP在灭火过程中HF的产生机理以及生成量预测,尚缺乏深入的认识.本工作首先应用量子化学从头算方法,在B3LYP/6-311++G(d,p)水平上,对BTP在火场作用下的热分解动力学特性进行研究;其次,采用原位光谱诊断方法,对BTP与火焰作用过程中HF的浓度变化进行实时在线测量,全面评估不同工况下燃烧状况和腐蚀性气体的浓度变化情况;再次,以量化计算结果为基础,通过理论分析和实验结果分析,建立HF生成量的理论预测模型;最后,通过对各种实验工况下的实验结果与理论计算结果的比较,验证HF理论计算模型的可靠性;该论文的研究结果表明,火焰温度以及BTP和火焰的接触时间,为影响HF生产量的关键因素;以量化计算结果为基础,结合热分解动力学的理论,构建出的HF生成量模型的计算结果和实验测量结果具有良好的一致性.该论文的研究,可以为优化BTP的系统设计,减少腐蚀性气体的生成量和拓宽BTP的工程应用范围提供基础.
Halocarbon fire extinguishing medium in the fire extinguishing process, the HF generated by thermal decomposition not only on the scene of the fire equipment has a serious corrosion phenomenon, but also on the fire scene personnel there is a serious injury, so the formation of HF has been halocarbon fire extinguishing media evaluation As one of the degradable halocarbons, is considered as a new generation of “halon” substitution technology with great potential for application. However, at present, BTP In the process of fire extinguishing, the generation mechanism of HF and the prediction of its production are still lacking in depth.In this work, we first applied the ab initio quantum chemistry method to study the effect of BTP on the field at B3LYP / 6-311 ++ G (d, p) The thermal decomposition kinetic properties of the BTP were investigated. Secondly, in-situ spectroscopic diagnosis was used to measure the concentration of HF in the BTP and flame in real time. The combustion conditions and the concentration of the corrosive gas under different conditions were evaluated comprehensively Then, based on the quantitative calculation results, the theoretical predictive model of HF generation was established through theoretical analysis and experimental analysis. Finally, the experimental results of various experimental conditions The results show that the flame temperature and the contact time between BTP and flame are the key factors affecting the production of HF. Based on the quantitative calculation results, combined with the thermal decomposition Kinetic theory and constructed HF generation model have good agreement with the experimental measurement results.The research of this dissertation can be used to optimize the system design of BTP, reduce the formation of corrosive gas and broaden the BTP project Application of the foundation.