QLD6.0/8III-B Multi-Function Fire Nozzle

1. Class A Fires (Solid Combustibles): Precision Suppression and Cooling

For fires involving solids such as wood, fabrics, and plastics, the direct jet mode of this nozzle can strike fire points from a distance to quickly lower the fire scene temperature; the spray mode, on the other hand, enables comprehensive cooling of the combustion area to prevent re-ignition. For example, during a furniture mall fire, firefighters first used the direct jet mode to penetrate thick smoke and suppress the fire deep in the shelves, then switched to the spray mode to cool the entire area, effectively avoiding fire re-ignition.

Fire Safety Knowledge Extension: The core of suppressing Class A fires is "cooling". Water has a high specific heat capacity of 4.2 kJ/(kg·℃)-1 kg of water can absorb 336 kJ of heat when heated from 20℃ to 100℃, making it the most cost-effective cooling medium.

2. Class B Fires (Liquids/Molten Solids): Explosion Prevention and Isolation

Direct jetting on fires involving flammable liquids such as gasoline, diesel, and paint can cause liquid splashing and fire spread. The spray mode of this nozzle forms a water curtain with a thickness of ≥0.5 meters, which can both cool the liquid surface to prevent temperature rise and isolate oxygen to inhibit combustion. During a gas station fire, firefighters used the spray mode to form a water curtain, successfully preventing the fire from spreading to the oil tank area.

Fire Safety Knowledge Extension: Suppressing Class B fires follows the principle of "control first, extinguish later". The role of water spray is "fire control" rather than direct extinguishing. After the liquid surface temperature drops below the ignition point, foam extinguishing agents should be used for complete suppression.

3. Personnel Evacuation and Protection: Water Curtain Shielding

In high-rise buildings or crowded places, the spray mode can form a "water wall" that effectively blocks thermal radiation and thick smoke, creating a safe passage for personnel evacuation. During an office building fire, firefighters used the spray mode to form a water curtain in the stairwell, successfully covering the evacuation of 12 trapped people from the 15th floor to a safe area.

Fire Safety Knowledge Extension: Thermal radiation is one of the main causes of casualties in high-rise building fires. A water spray curtain can reflect more than 90% of thermal radiation, reducing the ambient temperature from over 600℃ to a range tolerable to the human body.