The analysis on the influence of cable laying mode on fire spread trend

The cable is widely used as an important power transmission carrier. In order to better guide the construction of cable lines and rescue work after fire, this paper studies the effects of cable spacing, cable arrangement and cable layers on the fire spread trend in cable tunnel. In this paper, the simulation software named Pyrosim is used to build the model, and the flue gas content, CO concentration, CO2 concentration and HCl concentration are taken as the fire state indexes. The general law of the influence of the laying mode of the cable body on the fire spread trend is obtained: the smaller the cable spacing is, the later the generation time of CO and HCl is; The temperature rise of parallel cables during combustion is low, and less toxic gases such as CO and HCl are produced; When the cable is laid in fewer layers, the time of CO produced by cable combustion is earlier; The number of cable layers has little effect on the generation rate of CO2 and HCl in the early stage.