In addition to the fire damper of the fire exhaust fan pipe, the high temperature operation of the kitchen is considered. It is recommended to install 150 ℃ fire damper for other fan pipes (slightly different from the 70 ℃ of ordinary fan duct installation), It is necessary to turn off all other fans (the fire-fighting make-up air is close to the external windows and door gaps) when the fire-fighting smoke exhaust fan is in operation; when the "oil fume exhaust fan" is turned on, the "oil fume hood make-up fan" and the "fresh air pretreatment fan in the working area" should be started simultaneously (linkage).
The smoke exhaust valve is normally closed at ordinary times and opened in case of fire, which is linked with the alarm host. The opening condition is that the automatic alarm system has a fire alarm (detector alarm), the fire alarm host is in automatic state, the smoke exhaust valve is opened automatically, and the linkage smoke exhaust fan is started. The smoke exhaust fire damper is normally open at ordinary times and is also open in case of fire. However, when the flue gas temperature reaches 280 ℃, the smoke fire damper will automatically close and the fan that has been opened will stop running.
Jinan kitchen smoke exhaust
Jinan kitchen smoke exhaust instructions: generally used in the kitchen fan exhaust hood will take away a large amount of kitchen air, lampblack hood air supplement fan - when pumping oil smoke, it needs to supplement air to the kitchen, which provides about 80% of the oil fume exhaust volume. Working area fresh air pre-treatment fan - provides pre-treatment fresh air for kitchen work area (staff working position). This machine provides about 20% of the oil fume exhaust air volume, which exhausts the oil and gas from the cooking area hood.
Due to the different structure of the building where the kitchen is located and the location of the kitchen in the building, the centralized air conditioning system of the building should be used for orderly air supply in the kitchen with conditions. But at present, most of the situation is that there is no kitchen air supply system in the building. Many buildings with restaurants, kitchens and so on have only designed central heating system without central air conditioning system. When the kitchen is in working state, the exhaust system is put into operation, and the kitchen is in a negative pressure state.
If it is a new project, the impact of the installation of oil fume purifier on the exhaust system should be fully considered in the design; if it is a reconstruction project, the exhaust system needs to be recalculated when the oil fume purifier is installed, and if necessary, the smoke collecting hood, smoke exhaust pipe and kitchen integral air supplement device shall be reconstructed and the smoke exhaust fan shall be replaced.
In order to ensure the purification effect, in the actual design, the exhaust air volume should be calculated in strict accordance with the suction wind speed of the exhaust hood, and the suction speed of the hood mouth is usually not less than 0.5m/s.
The ventilation system of kitchen should adopt variable speed fan or associated fan for air supply and exhaust. Air supply and exhaust outlet arrangement: the arrangement of air supply and exhaust outlets in the kitchen should be considered according to the specific position of the stove, and the air supply jet should not disturb the ventilation performance of the stove 上一篇：通风管道有哪些机械通风原则呢？