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Exent (Nanjing) Security Technology Co., Ltd.

05-24

2023

Must see! Fire safety knowledge popularization

Understand basic fire protection knowledge, understand how to use fire-fighting facilities and equipment, understand escape and self-rescue ability, be able to check and correct fire hazards, be able to put out initial fires, and be able to organize personnel evacuation. How to use the fire extinguisher: Lift the fire extinguisher and walk about 3 meters to the thermal power station, unplug the safe, aim the nozzle at the root of the fire source, and press the handle firmly to sweep back and forth for use.

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05-24

2023

Fire Extinguishing Mechanism of High Pressure Water Mist Fire Extinguishing System

High-efficiency cooling effect: Since the droplet diameter of the fine water mist is very small, the diameter of the mist particle in the ordinary water mist system is 10-100 μm. During the process of vaporization, it absorbs a large amount of heat from the surface of the burning object or the fire area. Based on the latent heat of evaporation of water at 100°C as 2257kJ/kg, the heat absorption power of water mist sprayed by each nozzle (water spray speed 0.133L/s) is about 300KW. Experiments have shown that the smaller the diameter, the greater the heat absorption per unit area of ​​the water mist, the faster the droplet velocity, the smaller the diameter, and the higher the heat transfer rate.

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05-24

2023

How the detection alarm works

The smoke moves upwards and reaches the bottom of the ceiling. Smoke detectors detect fires through smoke. Smoke detectors know when you don't see a flame or smell smoke. It works non-stop, 24 hours a day, 365 days a year, without interruption. When calling the police, it makes a screeching and piercing sound until the smoke clears. Ionic sensors work by measuring the balance of positive and negative charges in the air. Inside the sensor, there is a small patch of radioactive material that generates a tiny electrical current in the air flowing in the sensing chamber. On the circuit board, there is a computer chip that monitors this current. When the smoke particles enter the sensing chamber, they disturb the balance of positive and negative charges there, and at the same time change the current. As the smoke gradually increases, the imbalance between positive and negative charges will increase. When this balance reaches a certain limit, the horn will sound.

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05-24

2023

Application of high pressure water mist fire extinguishing device

Combustible liquid fires in hydraulic stations, oil-immersed power transformer rooms, lubricating oil warehouses, turbine oil warehouses, diesel generator rooms, oil-fired boiler rooms, fuel-fired direct combustion engine rooms, and oil switch cabinet rooms;

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05-24

2023

Twenty fire safety common sense

Consciously maintain public fire safety, and quickly call 119 to call the police when a fire is found, and the fire brigade will not charge for fighting the fire.

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