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Wang S.,Tianjin Fire Research Institute
Advances in Energy Science and Equipment Engineering - Proceedings of International Conference on Energy Equipment Science and Engineering, ICEESE 2015

This paper offers a systematic research of foam extinguishing agents available. The paper also presents the functions of foam agents, classifications and respective applications in different places and cases. Classical types of foam agents have their unparalleled advantages while their side effects especially to the environment and human beings have been received growing attention. As the development of science technology and growing awareness of fire safety and environment, more and more scientists dig into the research of new type of foam agents. The paper generalizes the backgrounds of the collective researches of the new type of foam agents. The author also offers a couple of new forms of foam agents. Based on the systematic literature review and technical researches, the paper would like to illuminate more and more research achievements in near future. © 2015 Taylor & Francis Group, London. Source

Wang C.J.,Hefei University of Technology | Wang C.J.,Tianjin Fire Research Institute | Wen J.X.,University of Warwick
International Journal of Hydrogen Energy

The present study aims to test the capability of our newly developed density-based solver, ExplosionFoam, for flame acceleration (FA) and deflagration-to-detonation transition (DDT) in mixtures with concentration gradients which is of important safety concern. The solver is based on the open source computational fluid dynamics (CFD) platform OpenFOAM® and uses the hydrogen-air single-step chemistry and the corresponding transport coefficients developed by the authors. Numerical simulations have been conducted for the experimental set up of Ettner et al. [7], which involves flame acceleration and DDT in both homogeneous hydrogen-air mixture as well as an inhomogeneous mixture with concentration gradients in an obstucted channel. The predictions demonstrate good quantitative agreement with the experimental measurements in flame tip position, speed and pressure profiles. Qualitatively, the numerical simulations have reproduced well the flame acceleration and DDT phenomena observed in the experiment. The results have revealed that in the computed cases, DDT is induced by the interaction of the precursor inert shock wave with the wall close to high hydrogen concentration rather than with the obstacle. Some vortex pairs appear ahead of the flame due to the interaction between the obstacles and the gas flow caused by combustion-induced expansion, but they soon disappear after the flame passes through them. Hydrogen cannot be completely consumed especially in the fuel rich region. This is of additional safety concern as the unburned hydrogen can be potentially re-ignited once more fresh air is available in an accidental scenario, resulting in subsequent explosions. © 2016 Hydrogen Energy Publications LLC. Source

Zhuang S.,Tianjin Fire Research Institute
Advanced Materials Research

The study offers a detailed explanation of performance, origin and classification of persistent organic pollutants (POPs). The paper also overviews the current status in applying POPs in foam concentrates and its test method in China. The author indicates that to test perfluorooctane sulfonates (PFOS) in foam concentrates involves two steps, pretreatment and test. Provided the test equipment is of high reliability and validity, test result solely depends on the result of pretreatment. © (2014) Trans Tech Publications, Switzerland. Source

Huang X.,Hefei University of Technology | Huang X.,Tianjin Fire Research Institute | Wang X.S.,Hefei University of Technology | Liao G.X.,Hefei University of Technology
Proceedings of the Combustion Institute

A gas-outside-liquid-inside water mist nozzle based on effervescent atomization technology is designed, characterized and tested in this paper. The droplets size distribution, velocity under different operation pressures and gas-liquid-ratios (GLR) are measured with a Phase Doppler Analyser (PDA). The gas flow rate, liquid flow rate of the nozzle with one or seven orifices are also characterized under different operation pressures and GLR conditions, respectively. The results show that all of above parameters are mainly influenced by GLR, i.e., the larger the GLR is, the smaller the droplet size will be, and the liquid mass flow rate is exponentially increased with the increasing of GLR. The test results of fire suppression show that this gas-outside-liquid-inside effervescent atomizer works well for fire extinguishment except the cases where the liquid flow rate is less than about 70 kg/h and the gas pressure is lower than 0.3 MPa. © 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved. Source

Wang L.,Tianjin Fire Research Institute
Xiandai Huagong/Modern Chemical Industry

Coal chemical industry, especially the coal-to-olefins project, is vigorously developed in China nowadays. However, compared with the traditional petrochemical industry, the fire risk of coal-to-olefins is obviously different and should be deeply investigated. The overall risk of feedings, key installations and processes of the coal-to-olefins industry are analyzed. Source

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