高大宴会厅防排烟系统改造效果研究

Research on the Renovation Effect of Smoke Control and Extraction System in High and Large Banquet Hall

高大空间防排烟系统的安全性和可靠性非常重要。宁波市某宾馆防排烟系统需要改造,其中宴会厅为高大空间。针对宴会厅的防排烟系统改造设计方案进行数值模拟研究,首先根据现行规范计算排烟量,设计排烟口,计算排烟量比原设计排烟量减少41%,排烟风口减少1个;然后采用Pyrosim软件模拟改造前后烟气扩散情况,监测宴会厅内能见度、温度和CO浓度。模拟结果表明:安全疏散时间内,改造后的烟气一直保持在距地面5m以上,人眼特征高度处的温度最高降低3℃,建筑顶棚温度最高降低20℃,最小清晰高度处的CO浓度最大可降低0.6PPM。改造后的防排烟系统方案更安全可靠。

The safety and reliability of the smoke control system in high and large space is very important.The smoke control and extraction system of a hotel in Ningbo needs to be reformed,and the banquet hall is a high and large space.This paper conducts numerical simulation research on the renovation design scheme of the smoke control and extraction system in the banquet hall.First,the smoke volume is calculated according to the current specification,and the smoke outlet is designed,and the calculated smoke volume is reduced by 41%compared with the original design volume,and the smoke outlet is reduced by 1.Then,the smoke diffusion before and after the retrofit is simulated by using Pyrosim software,and the parameters such as visibility,temperature,and CO concentration are monitored in the banquet hall.During the safe evacuation time,the smoke after the transformation has been kept above 5 m from the ground.The temperature at the characteristic height of the human eye is reduced by 3℃,the temperature of the building ceiling is reduced by 20℃,and the CO concentration at the minimum clear height can be reduced by 0.6 PPM.The reformed smoke control system scheme is more safe and reliable.