2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)最新文献_第6页

Temperature Evolution Properties of Overhead Line Conductor Exposed to Large-scale Jet Fires Induced by High-pressure Natural Gas Leakage 高压天然气泄漏引发大规模射流火灾时架空线路导体温度演化特性研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055856

Zhenhua Wang, Fei You, Juncheng Jiang, Yun Zhang, Kai Shui, Jixiang Xu, Zonglin Fu, Wenhao Huangfu

引用次数: 0

Analysis on The Effectiveness of Detection and Alarm of Cable Corridor 电缆走廊探测报警效果分析

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055788

Lei Lei, Zhiyuan Wang, Yuan Li

{"title":"Analysis on The Effectiveness of Detection and Alarm of Cable Corridor","authors":"Lei Lei, Zhiyuan Wang, Yuan Li","doi":"10.1109/ICFSFPE48751.2019.9055788","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055788","url":null,"abstract":"For analyzing the effectiveness of fire detection alarm system in the underground pipe gallery, different types of detection alarm system (space detection and object detection) is installed in the model of L type and T type cable corridor. By changing fire source position and the environment air velocity, the writer compares the fire temperature field and smoke concentretion under different working conditions to the influence of detection alarm system effectiveness. The results show that when the corridor space structure is T-shaped, the detection system is more likely to get fire signal and alarm. When the position of the fire source changes, the fire source energy at the corner of the L-shaped tunnel is first monitored by the cable-type linear temperature detector. In the L-type tunnel, when the wind speed increases, the time of point-type temperature detector and cable-type linear temperature detector increases, and the wind speed keeps increasing, the point-type temperature detector fails to alarm. In the T-type tunnel, the time of point-type smoke detector and cable-type linear temperature detector increases as the wind speed increases.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"5 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78485598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Full-scale Experimental Study on Vertical Fire Spread Characteristics of Different Organic Insulation Systems 不同有机保温系统垂直火灾蔓延特性的全尺寸实验研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055823

Shoujiang Wang, Wei Cong, Yongzheng Yao, Yong Zhou, Xudong Cheng

引用次数: 0

Effect of Extraction Vent Length on Critical Exhaust Volumetric Flow Rate in Long-distance Subway Tunnel Fires with Two-point Extraction Ventilation 抽风口长度对地铁长距离隧道火灾两点抽风临界排气容积流量的影响

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055802

Peng Zhao, Zhongyuan Yuan, Nanyang Yu

{"title":"Effect of Extraction Vent Length on Critical Exhaust Volumetric Flow Rate in Long-distance Subway Tunnel Fires with Two-point Extraction Ventilation","authors":"Peng Zhao, Zhongyuan Yuan, Nanyang Yu","doi":"10.1109/ICFSFPE48751.2019.9055802","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055802","url":null,"abstract":"In recent years, point extraction ventilation mode is considered as a competitive alternative to control the smoke in the tunnel fire. The principle of point extraction ventilation is that sufficient exhaust volumetric flow rate is supplied to confine the smoke to an acceptable zone. However, the issue of an appropriate exhaust volumetric flow rate to confine the smoke to a safe zone has not been studied sufficiently. In this study, the critical exhaust volumetric flow rate to control the smoke to the zone between two extraction vents was proposed and a series of small-scale experiments were carried out to investigate the effect of extraction vent length on the critical exhaust volumetric flow rate. The heat release rate (HRR), extraction vent length and the distance between two vents varied during the tests. Smoke temperature below the ceiling and smoke configurations were measured and analyzed. Experimental results show that it is not the case that the longer the extraction vent, the smaller the critical exhaust volumetric flow rate. There exists a critical extraction vent length that is 0.1 m in the current study. Finally, an empirical equation was developed to predict the critical exhaust volumetric flow rate based on theoretical analysis. The coefficients in the equation were determined by experimental data. Compared with experimental data, it is obvious that the derived equation can well predict the critical exhaust volumetric flow rate. Research outcomes can provide some helpful references for the design of point extraction ventilation in the tunnel fire.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"222 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73352521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Characteristics and Mechanisms of Rod-Rod Electrode Gap Breakdown Induced by High-temperature and Clean Flame 高温清洁火焰诱导棒-棒电极间隙击穿的特性及机理

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055773

Jixiang Xu, Fei You, Wenhao Huangfu, Kai Shui, Songtao Zhou, Zonglin Fu

{"title":"Characteristics and Mechanisms of Rod-Rod Electrode Gap Breakdown Induced by High-temperature and Clean Flame","authors":"Jixiang Xu, Fei You, Wenhao Huangfu, Kai Shui, Songtao Zhou, Zonglin Fu","doi":"10.1109/ICFSFPE48751.2019.9055773","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055773","url":null,"abstract":"In order to investigate influence of high-temperature and intense flames derived from real wildfires on air gap breakdown properties around high voltage transmission lines, a rod-rod electrode breakdown-discharge test system under clean flame conditions was developed. After igniting ethanol, the gap between two copper rod electrodes was adjusted from 3.0 to 8.0 cm above and into the bulk flame, and dynamic charge load (from 0 to 50 kV) was applied externally to electrodes at each gap distance until there occurred breakdown across air gap. Evolution waveform and data of leaked current and instantaneous breakdown were recorded during the breakdown and discharge processes. Results show that under condition of high-temperature flame (750.0 °C~850.0 °C), breakdown voltages decrease by 55.7 %~68.3 % and 78.6 %~82.9 % when the flame is not bridged and bridged between two electrodes compared with those in pure air atmosphere. Under the action of a certain portion of flame plasma, insulating strength of rod-rod gap decreases significantly compared with that of pure air, which indicates that the high-temperature flame has a great influence on the formation and development of streamer, and is easier to form discharge channels.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"32 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77280768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tunnel Fire Suppression Tests with Water Mist Fire Extinguishing System Containing an Additive 含添加剂的水雾灭火系统的隧道灭火试验

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055853

Mingqiang Yan, Zejiang Zhang, Wei Liu, Yaqiang Jiang, Pingli Li, Meng Yang

引用次数: 1

Small Scale Experimental Study on Backdraft 回流的小尺度实验研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055838

Mingxuan Li, Xiujuan Mei, Bo Zhong, Chang-zheng Zhao, J. Xiong

引用次数: 1

Effect of States of Charge on the Burning Behaviors of Lithium ion Batteries 电荷状态对锂离子电池燃烧行为的影响

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055886

Lu-qing Rong, Xudong Cheng, Yangyang Fu

{"title":"Effect of States of Charge on the Burning Behaviors of Lithium ion Batteries","authors":"Lu-qing Rong, Xudong Cheng, Yangyang Fu","doi":"10.1109/ICFSFPE48751.2019.9055886","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055886","url":null,"abstract":"The burning behaviors of 18650 type lithium ion batteries under various states of charge (SOCs) were investigated using a cone calorimeter under an incident heat flux of 50 kW/m2. Several parameters were measured, including heat release rate (HRR), time to ignition and concentration of toxic gases. The experimental results show that the peak HRR, concentration of CO2 and CO increase with the increasing SOCs, whereas the time to ignition, time to explosion and the released energy during the burning decrease. The 100 % SOC is the highest fire risk due to the most serious toxicity (CO concentration: 1500 ppm), the maximum HRR (2.78 kW) and the shortest time to ignition (43 s). Besides, the burning process of the lithium ion batteries with various SOCs could be divided into four phases and the SOCs show important influence on the combustion intensity. The HRR of the fully charged LIBs is fourth power of time, which is much higher than the time-squared fire model mentioned in NFPA for most combustibles. A correlation is developed to predict the peak HRR. This study could serve as a technical guide for safe storage, application, and transportation in lithium ion batteries.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"18 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81479397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental Research on Burning Rate of Methane Pool Fires by Insulation and Crosswinds 保温与侧风作用下甲烷池火灾燃烧速率的实验研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055826

Yixiang Zhang, Jianlu Zhu, Cunyong Song, Yuxing Li, Hui Han

{"title":"Experimental Research on Burning Rate of Methane Pool Fires by Insulation and Crosswinds","authors":"Yixiang Zhang, Jianlu Zhu, Cunyong Song, Yuxing Li, Hui Han","doi":"10.1109/ICFSFPE48751.2019.9055826","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055826","url":null,"abstract":"In order to study the effect of wall insulation conditions and different airflows on burning rate of pool fires, a small-scale ethanol pool fire was conducted experimentally under three pool diameters and a certain lip height in a wind tunnel. The results showed that the non-monotonic mass loss rate decreases first and then increases with the increase of crosswinds at a certain lip height. The burning rate increases with the increased pool diameter of the non-insulated pool fires, while an opposite trend of burning rate was found in insulated pool fires at the same sizes. The dimensionless characteristics of Richard number presents the variation relationship between the buoyancy force and momentum during different airflows. The insulated liquid pool showed a higher burning rate than that in a non-insulated pool with the characteristic parameter of reciprocal of Richard number less than 2. With the value of Richard number continue increased, the burning rate in the insulated pool fires decreased due to the difference between the increased crosswind and heat transfer. The mass loss rate of pool fires without insulation increased with the increase of pool diameter, while an opposite trend was found in insulated pool fires at the same size. The experimental data supported to establish a ratio coefficient of burning rate with or without insulation under different crosswinds.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"86 5 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86498613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spontaneous Ignition of Thermally Thin and Intermediate PMMA Exposed to Linearly Increasing Thermal Radiation 热薄和中等PMMA暴露在线性增加的热辐射下的自燃

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055870

Mingrui Zhang, Chunjie Zhai, Junhui Gong

{"title":"Spontaneous Ignition of Thermally Thin and Intermediate PMMA Exposed to Linearly Increasing Thermal Radiation","authors":"Mingrui Zhang, Chunjie Zhai, Junhui Gong","doi":"10.1109/ICFSFPE48751.2019.9055870","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055870","url":null,"abstract":"Spontaneous ignition characteristics of thermally thin and thermally intermediate PMMA (polymethyl methacrylate) under linearly increasing heat flux (HF) are experimentally studied in this work utilizing a heating apparatus capable of flexibly controlling the radiation intensity. Ignition time, critical temperature, surface and in-depth temperatures of 1.5 and 6 mm PMMA at six sets of HFs were recorded in the tests. The corresponding measured values are estimated by numerical simulations considering the thermal decomposition of solid and insulation layer, and critical temperature is used as the ignition criterion. The results shown that the influences of insulation layer and solid pyrolysis on surface temperature are limited and significant, respectively. Thinner sample and larger HF growth rate lead to higher ignition temperature and shorter ignition time. Two stages are identified according to pyrolysis temperature prior to ignition. The measured critical temperature is 695.53 ± 16 K. Nonetheless, a more reasonable uncertainty range ± 30 K is suggested to interpret the variation of measured ignition time based on the simulation results.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"86 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85874910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2