Comprehensive Assimilation Of N-heptane Pool Fire Suppression Simulation By Water Mist And Its Synergistic Effects With Carbon Dioxide

Fire suppression has always been the topic of interest in oil and gas sectors,particularly on large scale.This is the reason why the focus of this research work is on the fire suppression of a large-scale n-heptane pool fire in a well-ventilated environment.Recently,water has been utilized as a supporting agent for the preparation of various kinds of liquid suppressing agents like AFFF Foams,which is mixed with different kind of gases for its various applications.On the basis of which,in this study,the water mist is opted for the gas-suppressing agents like carbon dioxide.The suppression effects upon a N-heptane pool fire by water mist and its mixture with carbon dioxide were investigated by numerical simulation,respectively.To conduct such analysis,first of all grid sensitivity analysis was conducted on various cell sizes.Suppression was initiated when the pool fire got a complete combustion to contrast it with the real-life incidents.Later on,to find an effective particle distribution system for water mist suppression,the comparison of two different particle distribution,with different sizes and number of droplets per second were analyzed for their effective fire suppression.During the water mist suppression only,it was found that Rosin-Rammler distribution was more efficient as compared to the Rosin-Rammler Lognormal on a large scale with a larger particle size.Water mist having a larger particle size(275 μm)with RR was found to be more efficient as compared to the smaller particles(124.6 μm)with respect to energy balance on gas phase,heat release rate,temperature and radiation.Afterwards,which was compared to the mixture of water mist and CO2 instantaneously.It was found that,the synergistic effect of mixture has higher advantages over the use of just water mist suppression.It is beneficial in cooling down the temperature above and below the nozzle and radiations surrounding the pool fire efficiently after a complete suppression.This synergistic effect helps lessen the hot gases surrounding the pool fire and allowing water mist to move forward towards the fuel efficiently.Although the thermal radiations surrounding the pool fire increased for a short period of time during the suppression by mixture,but it also highly decreased them as compared to water mist suppression only,which remained the same for a longer duration of time.The mass loss rate of the pool fire was also effectively decreased during the suppression by mixture.Both of the suppression mechanisms were set to similar initial parameters that lead to different outcomes with respect to energy balance on the gas phase,temperature above and below the nozzle and radiation towards sides of the pool.By now,such a discussion of employing liquid fluid with gaseous simultaneously is not to be found,and we intend to close this gap with this research.This research will open a wide variety of prospects and opportunities to optimize the utilization of water as a blending agent to support the fire quenching.