摘要
巷道火灾蔓延速度快且温度高,封堵控制过程中会对工作人员造成人身威胁,因此研究巷道火灾烟气封堵过程中温度变化规律及预测对其安全控制有重要意义。文中通过分析烟气质量流率的卷吸特征,基于火灾烟气温度控制方程建立了封堵条件下的巷道火灾烟气温度预测模型。搭建1∶10比例的巷道火灾相似模拟实验台,开展火源功率为4,6,8 MW的巷道火灾实验。测试进风侧单侧封堵比例为0%,25%,50%,75%,100%的15种工况下顶棚烟气温度分布,得到了不同封堵条件下的烟气温度衰减规律。采用平均绝对误差(MAE)、平均绝对百分误差(MAPE)、均方根误差(RMSE)和确定系数(R^(2))验证实验值与理论预测值的准确性。结果表明:当封堵比例大于50%时,随着封堵比例增加,抑制火灾效果明显,在不同封堵下烟气纵向温度分布呈高斯函数规律;通过对比不同封堵条件下的温度场的预测结果(MAE<0.0751,MAPE<0.1321,MSE<0.077,R^(2)=0.9069),发现该模型对封闭过程火区温度的预测结果较好。
The roadway fire spreads sharply with the high temperature,which can threat the safety of staff during the plugging control.Therefore,it is of great significance to explore the temperature change and prediction in the process of roadway fire smoke plugging for its safety control.In this study,the entrainment characteristics of the mass flow rate of the flue gas were analyzed,and a prediction model of the flue gas temperature of the roadway fire under the plugging condition was established based on the control equation of the fire smoke temperature.A similar simulation test bench for the 1∶10 ratio of roadway fires was set up,and the roadway fire experiments with the fire source power of 4,6,8 MW were tested.The roof smoke temperatures under 15 conditions were tested on the inlet side at 0%,25%,50%,75%,and 100%,and the flue gas temperature variations under different plugging conditions were analyzed.In addition,the average absolute error(MAE),average absolute percentage error(MAPE),root mean square error(RMSE)and determination coefficient(R^(2))were applied to verify the similarities between the values of experimental and theories.The results indicated that:when the blocking ratio was greater than 50%,the fire suppression effect was remarkable with the increase of blocking ratio,and the vertical temperature distribution of the flue gas under different blocking ratios described a Gaussian function variation.By comparing the prediction results of the temperature field under different plugging conditions(MAE<0.0751,MAPE<0.1321,MSE<0.077,and R^(2)=0.9069),the model turned to have a better prediction result for the fire zone temperature in the blocking process.
作者
马砺
张鹏宇
李超华
刘顺
MA Li;ZHANG Pengyu;LI Chaohua;LIU Shun(College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Shaanxi Key Laboratory of Prevention and Control of Coal Fire,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《西安科技大学学报》
CAS
北大核心
2021年第2期213-220,共8页
Journal of Xi’an University of Science and Technology
基金
国家重点研发计划(2018YFC0808104)。
关键词
安全科学与工程
巷道火灾
温度场
封堵
预测模型
safety science and engineering
roadway fire
temperature field
plugging
predictive model
