Calculation Model of Fume Temperature During Mine Fire
To judge the influence of fire ventilation pressure on ventilation system stability a fume temperature which is the key factor of determining the value of fire ventilation pressure calculation model has been constructed on the basis of combustion theory a
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Calculation Model of Fume Temperature During Mine Fire Xinran Hou, Jinshuang Li and Fusheng Wang
Abstract To judge the influence of fire ventilation pressure on ventilation system stability a fume temperature which is the key factor of determining the value of fire ventilation pressure calculation model has been constructed on the basis of combustion theory and thermodynamics. The construction of model adopted the law of conservation of energy, Boussinesq approximation, Newton cooling theory, and Dalton law, which improved the calculation accuracy of the temperature of mine fire fume and fire ventilation pressure. The model can provide reliable underlying data for ventilation network optimization during mine fire. Keywords Temperature of fume
Calculation model Fire ventilation pressure
99.1 Introduction During mine fire, the temperature of fume rises with the development of the fire, which leads to the reduction in the density of fume, and then produces an effect called ‘‘the buoyancy effect’’ [1, 2]. Fire ventilation pressure is often used as a representation of the value of the buoyancy effect in production. The causation of fire ventilation pressure must have two conditions: fire source and that the outsides of air fumes are vertical or inclined tunnels, so wherever mine fire happens, when
The paper is supported by Science Research Foundation of Hebei United University (project ID: z201206) X. Hou (&) J. Li F. Wang Hebei United University, Tangshan, 063009 Hebei, China e-mail: [email protected]
Z. Zhong (ed.), Proceedings of the International Conference on Information Engineering and Applications (IEA) 2012, Lecture Notes in Electrical Engineering 216, DOI: 10.1007/978-1-4471-4856-2_99, Ó Springer-Verlag London 2013
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air fume from fire area flow through vertical or inclined tunnels two different densities of air columns will be formed. The function is contrary to that of natural wind pressure of mine. It can affect the normal ventilation system [3, 4]. Airflow reversal may occur in some tunnels under the influence of fire ventilation pressure to some extent, which adds much to the difficulty of personnel escape and relief work [5, 6]. The temperature of fume is the basic to calculate fire ventilation pressure, so the construction of calculation model of fume temperature is very important to study fire ventilation pressure [7].
99.2 Calculation of Model of Fume Temperature Taking smoke fume as control volume, the calculation model of fume temperature is constructed using the law of conservation of energy. Supposing that the heat released from fuel combustion would divide into the needed heat of the temperature of smoke fume from T increase TS and the heat of convective heat transferred from smoke to roadway. In other words, the heat from fuel combustion should be equal to the sum of heat fumes needs and the heat exchange from surrounding rock. (1) The formation heat of fuel combustion Q h ¼ hu M F
ð99:1Þ
where Qh is the heat during combustion (kJ/h); hu is the low heat v
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