典型输煤栈桥钢壁面防火保护范围研究  

Study on the fire protection range for steel wall surfaces in typical coal conveyor bridges

作　　者：姜学鹏[1,2,3] 张永清 李彦林[4] JIANG Xuepeng;ZHANG Yongqing;LI Yanlin(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Institute of Safety and Emergency,Wuhan University of Science and Technology,Wuhan 430081,China;Research Center of Fire Safety,Wuhan University of Science and Technology,Wuhan 430081,China;Jiangsu Yonggang Group Co.,Zhangjiagang 215600,Jiangsu,China)

机构地区：[1]武汉科技大学资源与环境工程学院,武汉430081 [2]武汉科技大学安全与应急研究院,武汉430081 [3]武汉科技大学消防安全研究中心,武汉430081 [4]江苏永钢集团有限公司,江苏张家港215600

出　　处：《安全与环境学报》2025年第4期1319-1329,共11页Journal of Safety and Environment

基　　金：国家自然科学基金项目(52376130,52476127);国家消防救援局科技计划项目(2024XFCX22,2024XFZD04)。

摘　　要：为分析典型截面积和坡度输煤栈桥火灾发生后顶棚烟气/钢壁面温度场变化规律和防火保护范围,提出最佳排烟口间距与尺寸设计方法,基于火灾动力学仿真研究在相同火源功率条件下,截面、坡度和排烟道尺寸对顶棚钢壁面温度高于260℃区域范围分布的影响,进而得到栈桥顶棚钢壁面防火保护范围。结果表明:截面相对坡度对栈桥防火保护范围影响较小,3种截面栈桥顶棚钢壁面均超260℃;坡度对钢壁面超260℃区域范围影响较大;2 MW下,当坡度从6°增加到17°时,不同截面栈桥顶棚最高温度均逐渐降低,且顶棚钢壁面超260℃范围分别缩短0.5 m、1.0 m、1.6 m,烟气温度超120℃区域分别缩短34.2 m、37.4 m、31.4 m;通过改变排烟口参数得出,排烟口间距为30 m、尺寸(长×宽)为1 m×1.5 m时可以最大程度降低壁面温度,缩短壁面防火保护范围。To analyze the temperature field variation patterns of canopy smoke and steel wall surfaces,as well as the fire protection range following fires in coal conveyor bridges with typical cross-sectional areas and slopes,this study proposes an optimal design method for the spacing and dimensions of smoke exhaust openings.Building on fire dynamics simulation research,various fire scenario models are developed to explore the effects of cross-sectional type,slope,and smoke exhaust duct dimensions on the distribution of areas where the ceiling steel wall surface temperature exceeds 260℃,all under the same fire source power.This research aims to establish the fire protection range for the ceiling steel wall surfaces of coal conveyor bridges.The results indicate that the relative slope of the cross-section has a minimal impact on the fire protection range of coal conveyor bridges.The maximum temperatures on the internal ceiling steel wall surfaces of all three types of cross-sectional conveyor bridges exceed 260℃.The slope significantly affects the extent of the areas where the steel wall surface exceeds 260℃.At 2 MW,as the slope increases from 6°to 17°,the maximum ceiling temperatures of conveyor bridges with different cross-sections gradually decrease.Consequently,the areas where the steel wall surface exceeds 260℃are reduced by 0.5 m,1.0 m,and 1.6 m,respectively.The areas where the smoke temperature exceeds 120℃are reduced by 34.2 m,37.4 m,and 31.4 m,respectively.By adjusting the parameters of the smoke exhaust openings,it is found that a spacing of 30 m and dimensions of 1 m×1.5 m for the openings maximize the reduction in wall surface temperature while minimizing the fire protection range of the steel wall surface in coal conveyor bridges.

关 键 词：安全工程 输煤栈桥 坡度 防火保护范围 

分 类 号：X938[环境科学与工程—安全科学]