Investigation on the suppression effect of high momentum C6F12O (Novec-1230) flow on hydrogen jet flame |
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| Institution: | 1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. Faculty of Technology, Policy and Management, Safety and Security Science Group (S3G), TU Delft, 2628 BX, Delft, the Netherlands;3. Faculty of Applied Economics, Antwerp Research Group on Safety and Security (ARGoSS), Universiteit Antwerpen, 2000, Antwerp, Belgium;4. CEDON, KULeuven, 1000, Brussels, Belgium;1. SKLTCS, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China;2. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Power Engineering, Chongqing University, Chongqing 400044, China;1. School of Safety Science and Engineering, Xi''an University of Science and Technology, Xi''an, 710054, China;2. Shaanxi Industrial Process Safety and Emergency Rescue Engineering Technology Research Center, Xi''an University of Science and Technology, Xi''an, 710054, China;3. Shaanxi Key Laboratory of Coal Fire Disaster Prevention and Control, Xi''an University of Science and Technology, Xi''an, 710054, China;4. Department of Safety Health, And Environmental Engineering, National Yunlin University of Science and Technology, 123, University Rd., Sec 3, Douliou, Yunlin, 64002, Taiwan, ROC;1. College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China;2. Saifeite Engineering Group Co. Ltd., Qingdao, 266061, China;3. Department of Safety, Health, And Environmental Engineering, National Yunlin University of Science and Technology, Yunlin, 64002, Taiwan, ROC;1. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan, PR China;2. State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo, 454003, Henan, PR China;3. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo, 454003, Henan, PR China |
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| Abstract: | This work investigates the suppression effect of Novec-1230 on H2 jet flame. The suppressants are motivated by N2 flow to get higher momentum and approach the reaction kernel at flame base. The flame area with Novec-1230 is always smaller than that with water mist at the same condition. Novec-1230 exhibits better suppression effect on reaction kernel. The higher-momentum jet flame is more difficult to be suppressed. This is because that the higher-momentum flame makes the suppressant approach the reaction kernel more difficult. In addition, the high N2 flow rate containing suppressant could destroy flame temperature structure and decrease it. Results inferred that the temperature of flame with Novec-1230 is higher than that with water mist. Moreover, the lower minimum extinguishing time indicates that the suppression efficiency of Novec-1230 is better than that of water mist. The jet flame is extinguished only when H2 flow rate is low and N2 flow rate is high. There are two reasons: one is that the higher-momentum jet flame prevents suppressants to enter flame core. The other one is that the burner nozzle is heated to as igniting source during suppression progress. Furthermore, the burning velocity, adiabatic flame temperature, heat production and free radicals are investigated theoretically at Φ = 1.6, 1.0, 0.8 and 0.6. Results indicate that the burning velocity with Novec-1230 is much lower than that with water mist. The adiabatic flame temperature, heat production and free radicals increase firstly and then decrease with Novec-1230 addition at lean flame. |
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| Keywords: | Flame suppression Flame temperature Novec-1230 |
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