Experimental Research And Numerical Simulation Of Liquid Nitrogen Fire Control In Computer Data Center

With the rapid development of the Internet and the Internet of Things,the world has entered the DT era from the IT era,and the construction of data center computer rooms has flourished since 2001.As a frontier of 5G and Internet+technology,China has a strong growth potential in data center construction.But the consequences are unimaginable when it breaks out the fire.Therefore,the data center room to strengthen the fire safety measures to protect information storage,transmission security issues deserve high attention.Based on the liquid nitrogen cooling,choking characteristics for the study of technical background,the accident investigation,experimental test and numerical simulation of the means of combining computer data center room liquid nitrogen fire prevention study,in order to establish the feasibility of the data center room liquid nitrogen fire extinguishing system provides the related basic data,expand the application field of the liquid nitrogen fire extinguishing technology,has the potential of fire application.First of all,through to the data center,equipment failures under high temperature,high voltage cable invasion,foreign fire hazards analysis,establishing the data center room fire accident tree graph,it is concluded that the basic event of the fire,put forward in order to strengthen the management of computer room cable line,improve the room temperature control ability,and reduce artificial fire hazard data center room fire safety concept.Secondly,through the summary and analysis of the cases of fire in the data center room of the world in recent years,it is concluded that the main ignition source of the fire in the computer room is cables,network cables,optical fibers,power cables and other cables.UPS battery;Combustible material.These fires are mainly electrical fires and gas fire extinguishing system should be adopted.The feasibility of applying liquid nitrogen to data center machine room fire extinguishing is put forward by comparing and analyzing the performance of data center machine room fire gas extinguishing system,pre-acting sprinkler system,high-pressure fine water spray extinguishing system,and the performance of seflunopropane,IG-541,CO₂,aerosol and liquid nitrogen extinguishing agent.Then,through the cooling experiment of liquid nitrogen in the data center,the cooling conditions of 7 kinds of nozzles on different positions inside the box were analyzed,and it was concluded that the cooling effect of four fan spray nozzles 6520#and 11020#was good.The temperature of the heater could be reduced to 35?,and the temperature of the box could be reduced to-22?.Through the data center liquid nitrogen fire extinguishing experiment,the paper analyzes the influence of 6520#nozzle horizontal injection mode on the fire extinguishing effect of three different materials,and concludes that liquid nitrogen has different cooling effect on three kinds of ignition sources,the fiber surface flame retardant,the temperature fluctuation is large,and the average surface temperature of combustible materials such as cables can drop from 73.5?to 23.1?.Finally,by the engineering background of pizhou data center machine room,FDS software was applied to simulate the fire fighting situation with or without liquid nitrogen after the fire,and the characteristics of smoke spread,flame burning and temperature distribution in the machine room were analyzed and compared.The simulation results show that liquid nitrogen has a dispersive effect on the fire spreading in the data center computer room,and can make smoke spread in the upper space,which is helpful for escaping and rescuing,and can effectively reduce the temperature in the space,which has a protective effect on other body equipment.