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Aerosol fire extinguisher generator for battery cabinet 2021

Time: 2021/7/11

At present, there is a large stock of electric bicycles in our country. There are 300 million electric bicycles in the country, and 10 million electric bicycles are produced by manufacturers every year. The production and sales are booming. Electric bicycles have become an indispensable part of common people’s lives and penetrate most ordinary families. People’s short-distance travel demand continues to rise, accounting for 30% of people’s total travel demand and remains stable. 

In other words, the electric bicycle market is a market with large demand and many target users, and it has good development potential.

As the battery cabinet is centralized to charge the battery, the probability of risk is greatly increased compared with that of a battery, so the safety prevention and fire control of the battery cabinet are also pushed to the demand side.

Now we will introduce the aerosol fire extinguisher generator for battery cabinet.

battery cabinet

1. Aerosol fire extinguishing generator advantages for battery cabinet

The mainstream fire extinguishing devices currently on the market mainly include: dry powder fire extinguishing devices, heptafluoropropane fire extinguishing devices, aerosol fire extinguishing generator, carbon dioxide fire extinguishing devices, and water-based fire extinguishing devices.

The discharge of water-based fire extinguishers on electrical equipment will cause damage to electrical equipment. It is not suitable for live fires in live places such as switch cabinets. The storage of water-based fire extinguishers also has high requirements on the tightness of the device. When the electric cabinet is unattended for a long time, the leakage of the fire extinguishing agent due to force majeure should be taken into consideration.

Although the CO2 fire extinguishing device and the heptafluoropropane fire extinguishing device will not affect the use of the switch cabinet, they need to be connected by a pipe network and started with a fire detection pipe, and need to be maintained after the installation and reach the service life. Compared with other fire extinguishing systems, the cost The cost is too high.

After the dry powder fire extinguishing device is started, the dry powder will completely settle within 1-2 minutes, so the use in the switch cabinet cannot meet the fire suppression effect on the environment, and long-term storage of the dry powder will cause the dry powder to degenerate and become damp and agglomerate, greatly reducing the fire extinguishing ability . In the cold northern areas, the ambient temperature in winter is lower than the storage temperature of dry powder. Long-term low temperature environment will also affect the fire extinguishing performance of dry powder. For safety reasons, the effect of using dry powder fire extinguishers is far from the expected fire extinguishing effect.

In contrast, aerosol fire extinguisher generator have become the primary choice for switch cabinet scenarios due to their micro-residue, environmentally friendly, fire-extinguishing efficiency, high maintenance-free, pressure-free storage, and small size.

In the process of long-term use, the places where the switch cabinets are used are generally unattended outdoors or around large squares, working around the clock, outdoor high temperature, battery collision and other environments, which are extremely easy to cause fires. It is necessary to install a fire extinguishing device to protect the switch cabinet to extinguish the flame at the initial stage of the fire.

Since most of the cabinets are placed in outdoor unattended sites, the choice of fire extinguishing device is to be able to carry out an initial treatment of the battery fire in the cabinet before the personnel arrive, providing rescuers with 5-10 minutes. Ensure that the fire will no longer spread and develop.

Through the scope of application of the fire extinguishing device, the fire extinguishing mechanism, the fire extinguishing method, the discharge time of the fire extinguishing agent, the amount of the fire extinguishing agent, the volume of the fire extinguishing device, the installation of the fire extinguishing device, the storage pressure of the fire extinguishing agent, the cleaning and secondary pollution after the fire extinguishing, the installation and maintenance costs, etc. Comprehensive performance and economic index analysis and judgment: The aerosol fire extinguishing generator is more suitable for the operating environment and technical conditions of the switch cabinet.

2. Aerosol fire extinguisher generator working principle

The fire extinguishing mechanisms of general fire extinguishing agents mainly include isolation method, suffocation method, cooling method, and chemical suppression method. Different fire extinguishing agents have different fire extinguishing mechanisms. The fire extinguishing mechanism of hot aerosols is mainly embodied in two aspects: one is the cooling effect of endothermic decomposition, and the other is the chemical inhibition of gas and solid phases, which are coordinated with each other. In addition, the gas phase components in the aerosol fire extinguishing agent product also play a certain auxiliary role.

① Cooling and extinguishing effect of endothermic decomposition

The cooling effect of condensed aerosol fire extinguishing agent mainly relies on the endothermic decomposition of metal oxides and carbonates. The heat released by any fire in a relatively short period of time is limited. If the solid particles in the aerosol can absorb part of the heat released by the fire source in a relatively short period of time, the temperature of the flame will decrease and radiate to the burning surface. And the heat used to crack the gasified combustible molecules into free radicals will be reduced, and the combustion reaction will be suppressed to a certain extent.

② Gas phase chemical inhibition

Under the action of heat, the vaporized metal ions such as Sr, K, Mg or electron-losing cations decomposed by the condensed aerosol fire extinguishing agent exist in the form of steam, and undergo multiple chain reactions with the active groups H, OH and O during combustion. Take Sr as an example below:

Sr+2OH→SrOH2 Sr+O→SrO SrOH2+2H→Sr+2H2O

Repeatedly, the active groups in the combustion are consumed in a large amount, the concentration is continuously reduced, and the combustion is suppressed.

③ Solid phase chemical inhibition

The solid particles in the condensed aerosol fire extinguishing agent can adsorb the chain reaction intermediates OH, H and O, and catalyze them to recombine into stable molecules, thereby interrupting the branched chain reaction of the combustion process. Take K as an example:

K2O(s)+2H(g)→2KOH(s) KOH(s)+OH(g)→KO(s)+H2O(g)

K2O(s)+O(g)→2KO(s) KO(s)+H(g)→KOH

In the above-mentioned fire extinguishing effect, several fire extinguishing mechanisms interact and work together, but the gas transmission effect and the heat absorption and cooling effect of metal oxides or carbonates are only auxiliary effects, and the main fire extinguishing effect is still dependent on gas. , Chemical inhibition of solid phase.

The S-type condensed aerosol fire extinguishing generator can be activated by thermal wire (passive activation) and electric initiator (active activation). The thermal wire activation temperature is 170℃, and the device will be activated when the ambient temperature is reached. It can also be equipped with a detection system Actively activate the device through electrical signals to extinguish fires.

3. Aerosol fire extinguisher generator application

aerosol fire extinguisher for battery cabinet

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