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First-class fire engineers "safety practice technology" knowledge: gas kitchen and heat radiation from the fire source

A gas kitchen

1. Catering building set up atrium, according to the "building design fire code" (GB 50016-2006) the According to the "Building Design Fire Code" (GB 50016 2006), the area of its fire protection partition

should be calculated by superposition of the area of the upper and lower floors connected; if it exceeds the maximum permissible floor area of a fire protection partition, it should comply with the following provisions:

(1) the opening part of the room connected with the atrium should be set up with self-closing Class A fireproof windows and doors

(2) the halls and passageways connected with the atrium should be set up with Class A fireproof doors or fireproof shutters; fireproof doors or fireproof shutters should be set up with a fireproof door or fireproof shutter. Fire doors or fire shutters should be able to close or land automatically in case of fire

(3) The atrium should be equipped with smoke exhaust facilities according to the provisions of the Code for Fire Protection in Building Design (GB 50016-2006)

2. According to the provisions of the Code for Fire Protection in Building Design (GB 50016-2006) and the Code for Gas Design in Cities and Towns (GB 50028-2006), the smoke exhaust facilities should be set up according to the provisions of the Code for Fire Protection in Building Design (GB 50016-2006) and the Code for Gas Design in Cities and Towns (GB 50028-2006). According to the provisions of the Code for Fire Protection of Building Design (GB 50016-2006) and the Code for Urban Gas Design (GB 50028-2006), the gas kitchen and gas pipe wells of the catering building shall comply with the following provisions:

(1) Combustible gas pipes are strictly prohibited to pass through the fireproof wall

(2) The gas kitchen shall comply with the following requirements:

(1) The non-combustible partitions with the fire-resistance limit of not less than 2.0oh shall be used to separate from the other parts of the building, and doors and windows of the walls shall be class B fireproof walls, and the doors and windows shall be class B fireproof windows. Windows and doors should be class B fire doors and windows

② gas introduction pipe should be equipped with a manual quick shut-off valve and emergency automatic shut-off valve, emergency automatic shut-off valve must be closed in case of power failure (normally open)

③ gas stove should be flame failure protection device

④ kitchen should be set up to detect the gas concentration of the alarm, and centralized monitoring and control by the management room

⑤ desirable to have Smoke carbon monoxide concentration detection alarm

⑥ gas pipeline net height should not be less than 2.20m

⑦ there should be fixed explosion-proof lighting equipment

⑧ should be set up independent mechanical air supply and exhaust system, the air supply and exhaust system should be used explosion-proof ventilation equipment, when the fan is set up

in a separate partitioned ventilator room and the supply of air piping set up a check valve, it can be used for ordinary ventilation equipment. Check valve can be used when the ordinary type of ventilation equipment

(3) gas pipe wells should meet the following requirements:

① gas pipe wells should be set up independently, the walls of the wells should be fire-resistant limit of not less than 1.OOh non-combustible body, the well wall of the inspection door should be used Class C fire door

② gas pipe wells should be used at each floor of the floor of the floor is not less than the limit of non-combustible or fire blocking material sealing

② gas pipe wells should be used in the floor boards or Fire blocking material sealing

③ gas pipe wells and rooms, aisles and other connected holes should be sealed with fireproof blocking material

④ gas pipe in the shaft as far as possible not to set up or set up fewer valves and other accessories; the maximum pressure of the gas pipe in the shaft shall not be greater than 0.20MPa; gas pipe should be coated with yellow anticorrosive identification paint

⑤ every 4-5 floors to provide a gas The concentration of gas detection alarms every 4-5 floors, the height difference between the upper and lower two alarms should not be greater than 20m

Second, the heat radiation from the fire source

The intensity of heat radiation from the fire source interpretation

The intensity of heat radiation from the fire source interpretation: When a fire occurs, the source of the fire on the surrounding heat radiation and heat convection will be generated. The combustible materials around the fire source will gradually increase in temperature under the action of thermal radiation and heat convection

When it reaches its ignition temperature, combustion may occur, resulting in the spread of fire

In general. In the design of fire spread by radiation, when the ignited material is very thin and light curtains, loosely stacked newspapers and other items that are very easy to ignite, the critical radiation intensity can be taken as 10kW/m2; when the ignited material is upholstered furniture and other general items, the critical radiation intensity can be taken as 20kW/m2; for 5cm or thicker boards and other difficult to be ignited items, the critical radiation intensity can be taken as 40kW/m2

It is generally assumed that the radiant energy of the ignition source is released at the center of the fire, and the thermal radiation intensity formula is as follows:

q〃=Q/12πR2

where q〃 a thermal radiation intensity, that is, the value of the radiant heat flux (kW/m2);

Q a heat release rate of the ignition source (kw/m2);

Boltzmann constant, is 5.67×10-8kW/(m2?K4);

T a thermodynamic temperature