Gas fire extinguishing system for liquefied natural gas terminal: prefabricated pipeless hexafluoropropane fully submerged fire extinguishing system

Edit:Jiangsu Yongtai Fire Engineering Co., Ltd.UpDate:2019-12-09

Selection of LNG terminal gas fire extinguishing system:

Three types of gas fire extinguishing systems are listed in GB 50370-2005 "Code for Planning of Gas Fire Extinguishing Systems", which are: heptafluoropropane fire extinguishing system, IG541 mixed gas fire extinguishing system and hot aerosol prefabricated fire extinguishing system. According to the practical characteristics and specifications of a large number of protection zones and small protection zones in this project, a prefabricated pipeless sevoflurane full engulfing fire suppression system was selected. The fire extinguishing system is a prefabricated, fully engulfed fire extinguishing system, which is independent and complete. Compared with a pipe network fire extinguishing system, it has flexible equipment, beautiful appearance, no fire extinguishing agent loss, high efficiency, fast speed, and no pollution. And other features, it is a pipeless, simple, portable, automatic fire extinguishing equipment that can protect a small area. The pipeless fire extinguishing system does not have a bottle storage room, and the gas storage bottle and the entire system are set in a protected area. In the event of a fire, the system sprays fire extinguishing agents directly into the protected area, which is convenient and convenient. It is suitable for protected areas of smaller spaces such as computer rooms, archives, valuables storage, and telecommunications centers.

Prefabricated pipeless heptafluoropropane full engulfing fire extinguishing system: the fire extinguishing mechanism of heptafluoropropane

① Cooling the protection area

Heptafluoropropane fire extinguishing agent is stored in a container in a liquid state under high pressure. When the nozzle is sprayed, the liquid fire extinguishing agent quickly changes to a gaseous state. It needs to absorb a lot of heat and reduce the temperature of the protective area and the flame.

② Fire extinguishing agent responds by burning

Heptafluoropropane fire extinguishing agent is composed of macromolecules. At high temperature, the molecular chain in the molecule is broken, and its compounds can interrupt the chain transfer of chemical chain reaction during the combustion process, and then perform the fire suppression according to the chemical reaction during the combustion process.

③ Consumption of oxygen

The discharge of fire extinguishing agents in the protective zone reduces the concentration of oxygen and then the rate of combustion.

Prefabricated pipeless heptafluoropropane total engulfing fire extinguishing system: fire extinguishing system setup

The planned protection policy is a total of 5 protection zones for the transformer room, low-voltage power distribution room, control room, equipment room and UPS room, which are protected by 5 sets of prefabricated pipeless heptafluoropropane fire extinguishing equipment. The planned filling pressure of the system is 2.5 MPa, and the planned temperature of the fire extinguishing system is 20 ° C. The fire resistance limit of the protective structure and doors and windows should not be lower than 0.5h, and the fire resistance limit of the suspended ceiling should not be lower than 0.25h. The allowable pressure of internal pressure should not be lower than 1200Pa. The door of the protective area should be open to the direction of slackness and can be closed by itself. The door used for slackness must be able to open from the protective area. The unit volume of the system fire extinguishing agent should not be greater than 1120kg / m3. The pressure relief port should be provided in the protection area, and it should be located on the external wall, and its height should be more than 2/3 of the clear height of the protection area. Before spraying the fire extinguishing agent, other openings in the protective area except the pressure relief port should be able to close by themselves.

The slack passages and exits in the protected area shall be provided with emergency lighting and slack indication signs. At the entrance of the protective zone, there are sound and light alarms and fire extinguishing agent discharge indicator lights, as well as the signs of the corresponding gas fire extinguishing system selected in the protective zone.