Extinguishing Agent

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Pan Renming - One of the best experts on this subject based on the ideXlab platform.

  • Experimental research on the thermal decomposition of pentafluoroethane (HFC-125) Extinguishing Agent with n-heptane/air pool fire in confined space
    RSC Advances, 2016
    Co-Authors: Wang Ting, Qin Kuang, Pan Renming
    Abstract:

    To discuss the production law of hazardous gases (e.g. hydrogen fluoride) during the interaction between a pentafluoroethane Extinguishing Agent and an n-heptane flame, we designed a simulation of experimental total flooding conditions that is highly similar to the actual total flooding automatic Extinguishing conditions. In this study, a qualitative and quantitative analysis on the thermolysis gaseous products was performed through GC-MS and ion chromatography (IC) by studying the thermal decomposition characteristics of the interaction between a pentafluoroethane Extinguishing Agent and an n-heptane flame in a 1 m3 fire-smothering room under different fire sizes and interaction times. Research results demonstrated that the thermolysis gaseous products of the pentafluoroethane Extinguishing Agent and n-heptane flame include hydrogen fluoride (HF) and other organic gases, such as CF3CHCF2 and CF3CH2CF3. The HF output was proportional to the fire size and interaction time. When the interaction time was controlled within 10 s, production of hazardous gases could be effectively reduced.

  • Simulation Research of Superfine Powder Extinguishing Agent Movement
    Procedia Engineering, 2012
    Co-Authors: Xu Dayong, Zhou Ru, Pan Xuhai, Pan Renming
    Abstract:

    Abstract The movement process of superfine powder Extinguishing Agent would be affected by temperature gradient, hot smoke and thermal radiation existed in fire. Numerical simulation was used to make a comparative research on superfine powder Extinguishing Agent movement released in non-fire room and fire room. The results showed that when superfine powder Extinguishing Agent was released in non-fire room, particles were mainly controlled by drive gas and moved to the bottom of the fire room firstly. And then particles moved to the side walls of the room after they impacted the bottom. Finally, total flooding condition was formed from the bottom to top. When fire was located at the middle ground, particles moved to both sides of the room at early time after release. And then particles reached the flame region from the sides and top of the flame. Finally total flooding condition was formed from the top to the bottom, and the total flooding time was pretty much exactly the same as non-fire condition. When fire was located at the left bottom corner, particles were mainly controlled by eddies, which led to irregular trajectory and uneven concentration distribution of particles. Under this condition, particles were mainly entrained into flame region by eddies, and it took more time to form total flooding condition.

  • Numerical simulation of superfine powder Extinguishing Agent movement released in non-fire room
    Journal of Nanjing University of Technology, 2012
    Co-Authors: Pan Renming
    Abstract:

    The Fluent software was used to simulate the superfine powder Extinguishing Agent movement released in non-fire room,and then a comparative study was made between simulation and experiment results.The results showed that after the fire Extinguishing Agent particles being released,those particles were mainly controlled by drive gas and moved to the bottom of the fire room firstly,and then,returned up to the top of the fire room after being hit by the bottom.Some particles reached to the top of the fire room at 0.5 s.For the fire rooms filled with 500 and 1 000 g Extinguishing Agent,the particle concentration of the latter room was higher than the former one in the simulation.The diffuse characteristic was better under 1.2 MPa injection pressure and it took less time for forming total flooding condition under 1.0 and 1.2 MPa injection pressure.The concentration curve of the simulation was different from that of the experiment,but the movement process of fire Extinguishing Agent particles was the same compared with experimental results.

  • Discharging and Flow Ability of Superfine Powder Extinguishing Agent
    Journal of Combustion Science and Technology, 2011
    Co-Authors: Pan Renming
    Abstract:

    In order to investigate the flowing ability of superfine powder Extinguishing Agent,particle concentration distribution was tested by a laser measuring system designed by the authors in a 10 m3 closed room.The average parti-cle size of the Extinguishing Agent is about 6 μm.A new discharge device of Extinguishing Agent was designed accord-ing to bursting principle and employed in experiment.The experimental results indicated that Extinguishing Agent powder could be quickly dispersed after discharge.However,the concentration was not evenly distributed.Particle concentration was relatively high in the bursting direction but low in the corner of room.Bursting effect disappeared about 0.35 s later after discharging.Then,particles of Extinguishing Agent diffused freely.The concentration of extin-guishing Agent remained relatively high in the local space.It was found that both energy releasing power of gas-generating Agent and particle size of Extinguishing Agent had a great effect on dispersion of Extinguishing Agent.The more of energy releasing power and the less of size of Extinguishing Agent,the more quickly the Extinguishing Agent dispersed and the more uniform Extinguishing Agent particle distribution is in the limited space.Superfine powder fire-Extinguishing Agent has the potential for fire protection under total flooding conditions.

  • Influencing factors for Burning Rate of Aerosol Fire-Extinguishing Agent
    Fire Safety Science, 2007
    Co-Authors: Pan Renming
    Abstract:

    This paper investigates the influencing factors for the combustion rate of aerosol fire-Extinguishing Agents with the same formulation under different states.The factors include the intial temperature,density of the column,and particle size of raw materials,etc.The influence of these factors on burning rate is concluded.

Zhou Xiao - One of the best experts on this subject based on the ideXlab platform.

Yang L - One of the best experts on this subject based on the ideXlab platform.

  • Simulation of Superfine Powder Extinguishing Agent Explosion Scatters and Research on Fire-Extinguishing Ability
    Computer Simulation, 2014
    Co-Authors: Yang L
    Abstract:

    In order to improve the high-rise fire-Extinguishing efficiency,optimal design and reduce cost of fire-Extinguishing,to analyze the process and characteristics about explosion scatter about superfine powder high-rise fire-Extinguishing projectile,simulation the explosion scatters process of high-rise fire-Extinguishing projectile by AUTODYN,and propose the method about estimate the fire-Extinguishing power. According to the principle of detonation products isentropic expansion and the fluid dynamics,analysis and calculation Extinguishing ability and estimate the fire-Extinguishing power by theoretical analysis of Extinguishing Agent scatter in every stages. To establish the mathematical model of Extinguishing Agent explosion scatter,propose calculation method of Extinguishing Agent scatter radius and estimate the fire-Extinguishing power,which has reference significance for the study of fire-Extinguishing ability of Extinguishing Agent.

Shuai Wang - One of the best experts on this subject based on the ideXlab platform.

  • A global analysis on water-based fire Extinguishing Agent
    IOP Conference Series: Earth and Environmental Science, 2017
    Co-Authors: Shuai Wang
    Abstract:

    Due to the superiority of the attribute of water, water-based fire Extinguishing Agent is considered as one of most effectively fire Extinguishing Agents. NFPA has developed two standards regarding to water-based fire Extinguishing Agents. ISO technical committee working group is also preparing for developing a standard about the subject fire Extinguishing Agent. China also has its own national GB standard about water-based standard. This paper aims at to elaborate standard requirements and methods in different technical documents and standards currently available around the world with a view to summarize the main concern in different standards, and trying to find out valuable information for readers in future research and development.

  • The Research of Foam Extinguishing Agent International Standardization
    Applied Mechanics and Materials, 2013
    Co-Authors: Liang Yang, Shuang Zhuang, Shuai Wang
    Abstract:

    In this paper, differences between current major international and regional standards of foam Extinguishing Agent and China standard are analyzed. The reason of performance requirements and application characteristics are also stated and summarized. The research of this paper will greatly push forward the standardization development of foam Extinguishing Agent in China

Xiao Ying - One of the best experts on this subject based on the ideXlab platform.

  • Research on the Regular between Concentration of Superfine Powder Extinguishing Agent Explosion Scatter and Fire-Extinguishing Ability
    Advanced Materials Research, 2014
    Co-Authors: Li Yang, Qian Li Zhao, Xiao Dong Chai, Xiao Ying
    Abstract:

    In order to improve high-rise fire-Extinguishing efficiency and reduce fire-Extinguishing cost, a mathematical model of explosion and dispersion of Extinguishing Agent was built by using AUTODYN on the basis of isentropic expansion law of detonation outcome and theory of hydrodynamics to simulate the dispensing process of high-rise superfine powder fire-Extinguishing Agent. Different locations on the high-rise fire-Extinguishing bomb were selected to be Gauss points and then were analyzed, all calculating results were contrasted finally. A method used for evaluating fire-Extinguishing efficiency of fire-Extinguishing bomb was put forward according to the analysis of Agent concentration of different moment that it was dispensed, which was referentially meaningful to study the Extinguishing efficiency of Extinguishing Agent.

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