燃气电厂LNG 接收站火灾报警系统设计浅析

火灾自动报警系统的系统供电可靠性,关系到火灾发生后系统能否按预期要求进行报警联动。设计中通常通过经验确定系统的配置构成,对于联动较多、负荷较大、距离较远的装置,常忽略了电源总线对系统稳定运行的影响。以燃气电厂LNG接收站为例,从实际系统构成出发,推导了电源总线对火灾自动报警系统可靠性的影响,给出了3种不同的供电设计方案,可为工程设计人员提供设计参考,避免消防设备在火灾发生时由于选择的电缆截面积、长度或系统配置不合理,而无法可靠动作。

ANALYSIS ON THE DESIGN OF FIRE ALARM SYSTEM FOR LNG TERMINALS IN GAS POWER PLANT

The reliability of the system power supply of the automatic fire alarm system is related to whether the system can carry out alarm linkage according to the expectation after fire occurs.In design,the configuration of the system is usually determined by experience,and the impacts of the power bus on the stable operation of the system are often neglected for devices with more linkage,large load and far distance.Taking LNG terminal in gas power plant as an example,this paper deduces the impacts of power bus on the reliability of automatic fire alarm system based on the actual system composition,and gives three different power supply design schemes.This provide design reference for engineering designers so as to avoid failure of firefighting equipment to act reliably in the event of fire due to unreasonable cable cross-sectional area,length or system configuration.