Ultra fine dry powder, a very fine powder, with an average particle size of about 5-10 microns. The size is dozens of times smaller than ordinary dry powder. At the same time, it has very good resistance to re ignition, diffusivity and electrical insulation, and its fire-extinguishing performance has been greatly improved. At the same time, due to its small particle size and good fluidity, it can be applied to a variety of places, which can be used not only for fire-extinguishing in relatively closed spaces, but also for local fire-extinguishing in open places. Correspondingly, there are many application modes, including hanging type, pipe network type, cabinet type, portable type, etc.
Today, we will discuss several application methods of ultra-fine dry powder and how to choose them.
In the ultra-fine dry powder, the hanging type is a common form of application, and the hanging type is divided into pressure storage and non pressure storage, and in the spraying, it is divided into three types: electric control, temperature control and electric temperature dual control.
Pressure storage suspended ultra-fine dry powder: the characteristics of pressure storage ultra-fine dry powder are that the release of ultra-fine dry powder is evenly distributed in space, with low sound, long time and low cost. The pressure storage ultra-fine dry powder is suitable for full flooding fire extinguishing and places where there are often people or frequent spraying fire extinguishing. At the same time, due to the uniform spatial distribution of ultra-fine dry powder, it is bound to have poor directivity, so it is not suitable for local flooding.
Non pressure storage suspended ultra-fine dry powder: non pressure storage suspended ultra-fine dry powder, the space uniformity of releasing ultra-fine dry powder is poor, the sound is loud, the time is short, and the cost is high. A single device is not suitable for full flooding fire extinguishing. At the same time, because the delivery distance of ultra-fine dry powder is long and the release quality is good, it is suitable for flooding fire extinguishing methods or places with fast fire spread speed.
The above is the difference between pressure storage and non pressure storage. Correspondingly, we choose the corresponding application form according to the type of our own protective area. In the face of local flooding or places with very fast fire spread, we choose non pressure storage ultra-fine dry powder. In the face of closed environment and places where powder is often sprayed for fire extinguishing, we choose pressure storage.
Let me give you an example, the urban comprehensive underground pipe gallery, and ultra-fine dry powder is the best choice for this kind of place. In the face of this narrow and complex area, choosing non pressure storage type is simply a better choice, because the terrain of the urban underground comprehensive pipe gallery is complex, and when encountering a fire, the fire spreads particularly fast.
When facing places such as computer room and power distribution room, the pressure storage type is a better choice, because the space is relatively closed, this full flooding fire extinguishing method is very suitable for using the pressure storage type, and it can also play its role.
As for the spray mode, the electric control is manual, the temperature control is automatic, and the electric and temperature dual control is manual and automatic.
At the same time, superfine dry powder also has similar application forms with heptafluoropropane, pipe network and cabinet type (non pipe network), and the application place is also selected according to whether the protection area is large and there are many areas. When facing multiple protection areas, the pipe network is better, and the cabinet type is better when facing a single or a small number of protection areas.
