FIRE SAFETY FACILITIES IN CLEAN ROOM

① Clean room is increasingly widely used in various industries such as electronics, biopharmaceuticals, aerospace, precision machinery, fine chemicals, food processing, health care products and cosmetics production and scientific research. Clean production environments, clean experimental environments and the importance of creating a working environment is increasingly recognized or recognized by people. Most clean rooms are equipped with production equipment and scientific research experimental equipment of varying degrees and using various process media. Many of them are valuable equipment and instruments. Not only is the construction cost expensive, but also some flammable, explosive and hazardous process media are often used; at the same time, in accordance with the requirements for human and material cleanliness in clean room, the passages of the clean room are generally tortuous, making personnel evacuation difficult. Once a fire breaks out, it is not easy to be discovered from outside, and it is difficult for firefighters to approach and enter. Therefore, it is generally believed that the installation of fire safety facilities in clean room is very important. It can be said to be the top priority in ensuring the safety of clean room. Safety measures to prevent or avoid major economic losses in clean room and serious damage to personnel's lives due to the occurrence of fire. It has become a consensus to install fire alarm systems and various devices in clean room, and it is an indispensable safety measure. Therefore, fire alarm detectors are currently installed in newly built, renovated and expanded clean room.

② Manual fire alarm buttons should be installed in production areas and corridors of clean room. Clean room should be equipped with a fire duty room or control room, which should not be located in clean room. The fire duty room should be equipped with a special telephone switchboard for fire protection. The fire control equipment and line connections of the clean room should be reliable. The control and display functions of the control equipment should comply with the relevant provisions of the current national standard "Design Code for Automatic Fire Alarm Systems". Fire alarm in clean room should be verified, and the following fire linkage controls should be carried out: the indoor fire pump should be started and its feedback signal should be received. In addition to automatic control, a manual direct control device should also be set up in the fire control room; the electric fire doors in relevant parts should be closed, the corresponding air conditioning circulation fans, exhaust fans and fresh air fans should be stopped, and their feedback signals should be received; the electric fire doors in relevant parts should be closed , fire shutter door. The backup emergency lighting and evacuation sign lights should be controlled to light up. In the fire control room or low-voltage power distribution room, the non-fire power supply in relevant parts should be manually cut off; the fire emergency loudspeaker should be started for manual or automatic broadcast; Control the elevator to lower to the first floor and receive its feedback signal.

③ In view of the requirements of the product production process in clean room and clean room should maintain the necessary cleanliness level, it is emphasized in clean room that after the fire detector alarms, manual verification and control should be carried out. When it is confirmed that a fire has actually occurred, the set-up linkage control equipment operates and feeds back signals to avoid large losses. The production requirements in clean room are different from those in ordinary factories. For clean room with strict cleanliness requirements, if the purification air-conditioning system is shut down and restored again, the cleanliness will be affected, making it unable to meet process production requirements and causing losses.

④According to the characteristics of clean room, fire detectors should be installed in clean production areas, technical mezzanines, machine rooms and other rooms. According to the requirements of the national standard "Design Code for Automatic Fire Alarm Systems", when selecting fire detectors, you should generally do the following: For places where there is a smoldering stage in the early stages of a fire, a large amount of smoke and a small amount of heat are generated, and there is little or no flame radiation, smoke-sensing fire detectors should be selected; for places where fires may develop rapidly and produce a large amount of heat, smoke and flame radiation, temperature-sensing fire detectors, smoke-sensing fire detectors, flame detectors or their combination can be selected; For places where fires develop rapidly, have strong flame radiation and a small amount of smoke and heat, flame detectors should be used. Due to the diversification of modern enterprise production processes and building materials, it is difficult to accurately judge the fire development trend and smoke, heat, flame radiation, etc. in clean room. At this time, the location of the protected place where the fire may occur and the burning materials should be determined, material analysis, conduct simulated combustion tests, and select appropriate fire ash detectors based on test results. Normally, temperature-sensitive fire detectors are less sensitive to fire detection than smoke-sensitive type detectors. Heat-sensitive fire detectors do not respond to smoldering fires and can only respond after the flame reaches a certain level. Therefore, temperature-sensitive fire detectors Fire detectors are not suitable for protecting places where small fires may cause unacceptable losses, but temperature-sensitive fire detection is more suitable for early warning of places where the temperature of an object changes directly. Flame detectors will respond as long as there is radiation from the flame. In places where fires are accompanied by open flames, the rapid response of flame detectors is better than smoke and temperature-sensing fire detectors, so in places where open flames are prone to burning, such as flame detectors are mostly used in places where combustible gases are used.

⑤ A variety of flammable, explosive and toxic process media are often used in clean room for LCD panel manufacturing and optoelectronic product manufacturing. Therefore, in the "Design Code for Electronic Clean Room", some fire safety facilities such as fire alarms have been made. More regulations. Most electronic clean room belong to Category C production plants and should be classified as "secondary protection level". However, for electronic clean room such as chip manufacturing and LCD device panel manufacturing, due to the complex production process of such electronic products, some production processes require the use of a variety of flammable chemical solvents and flammable and toxic gases, special gases rest, the clean room is a closed space. Once a flood occurs, heat will leak nowhere and the fire will spread quickly. Through air ducts, the fireworks will spread rapidly along air ducts. The production equipment is very expensive, so it is very important to strengthen the fire alarm system setting of the clean room. Therefore, it is stipulated that when the fire protection zone area exceeds the regulations, the protection level should be upgraded to level one.