Mu Tianyu heard Brother Bin ask about the ultra-fine dry powder fire extinguishing agent, and thought of the performance characteristics of the ultra-fine dry powder, especially the minimum fire extinguishing concentration of the ultra-fine dry powder, which is only 65 grams per cubic meter, and is non-toxic and harmless, non-corrosive to objects, non-irritating to the human respiratory tract, and has high insulation.

"Ahh Mu Tianyu was immediately pleasantly surprised and said to Yang Bin: "Brother Bin, are you going to use ultra-fine dry powder to make fire extinguishing bombs?" ”

Yang Bin on the other end of the phone admired Mu Tianyu's little brother very much, he only mentioned the ultra-fine dry powder, and Mu Tianyu could think of the raw materials for fire extinguishers.

"Xiao Yu, I still have such a good heart, I admire. That's it, it's so easy to talk to you, so, it also makes me love you so much! ”

"Haha, Brother Bin is the same as my elders, I respect you very much, every time I have insurmountable difficulties, I think of you, and it will definitely be no problem!"

Yang Bin could hear that Mu Tianyu was already elated on the other end of the phone, and he was extremely happy in his heart.

Although ultra-fine dry powder is not a military material, as soon as it appeared, it attracted Yang Bin's attention. He studied it at a very early age, but he didn't expect that after all these years, it would finally be useful.

And after so many years, there are now relatively mature ultra-fine dry powder products in China.

"Xiaoyu, don't worry, I will send the 20mm large-caliber anti-materiel gun and the matching fire extinguishing bomb to Jiangcheng as soon as possible, wait, ah!"

When Mu Tianyu thought that the minimum fire extinguishing concentration was only 65 grams per cubic meter, he felt exhilarating and encouraging.

What is this concept? In other words, as long as one elongated 20 mm caliber fire extinguishing bomb can be compressed and loaded with at least 400 grams of ultra-fine dry powder.

Then this ultra-fine dry powder fire extinguishing bomb can extinguish the fire in a 20-square-meter room.

When some readers see this, they can't help but ask: Has the author never learned arithmetic?

400 grams of ultra-fine dry powder, calculated according to the dose of 65 grams per cubic meter, is not the space that can extinguish the fire 6.15 cubic meters? The 20-square-meter room is at least 50 cubic meters!

In fact, because the fire extinguishing particles of ultra-fine dry powder have a large relative surface area, high activity, fast thermal decomposition rate, and strong ability to capture free radicals, the fire extinguishing efficiency is greatly improved.

In addition, the ultra-fine dry powder can be suspended in the air for several minutes to form a relatively stable cold aerosol, so not only the fire extinguishing efficiency is very high, but also the use method is completely different from the general traditional dry powder fire extinguishing agent.

The long-term suspension characteristics of ultra-fine dry powder fire extinguishing agent make it release and flow like a gas, and can bypass obstacles and spread to all corners to achieve fully submerged fire extinguishing in a relatively closed space.

In addition, due to the physical coverage characteristics of powder settlement during dry powder fire extinguishing, it can also realize local submersion fire extinguishing in a large space (or open place).

It is precisely because of the ultra-fine dry powder that it can quickly react with the flame and can almost completely extinguish the fire; The ultra-fine dry powder can be suspended in the air for a long time, and can be used like a gas to bypass obstacles to extinguish fires, so the effect of total submersion is very good.

More importantly, the powder mist formed by ultrafine dry powder also has thermotropic properties and can actively capture combustion radicals.

Generally speaking, in a 20-square-meter room, the place where the fire really started does not fill the entire 50-dimensional meter space, and usually only 5 or 6 cubic meters of space really has a burning flame.

This means that in a 20-square-meter fire field, 400 grams of ultra-fine dry powder, after spraying, every tiny particle will automatically bypass the obstacle, "find" the flame, and quickly capture a burning free radical. In the 5 or 6 cubic meters of flame, the combustion free radicals and the high-efficiency ultra-fine dry powder components of the composite materials immediately interact, combined into inactive water vapor and other inactive substances, so that the flame burning free radicals are consumed faster than the production rate, the combustion free radicals are quickly exhausted, the chain reaction process is terminated, and the fire in the whole room is quickly extinguished.

The above is the data that the author gives you in plain language, and it is based on Mu Tianyu's estimation results for easy understanding. If the formula is calculated according to the national "Code for Design, Construction and Acceptance of Ultrafine Dry Powder Fire Extinguishing System": M=V×Q×K

M…… Design powder consumption (kg)

V…… Volume of protection zone (m³)

Q…… The design injection density is 0.072 kg/m³

K…… Design calculation factors

Heavy hazard level (generator room, oil storage room, etc.) M=V×0.143

Medium hazard level (cable interlayer, tunnel opening and closing, power distribution room and strong and weak current room, etc.) M=V×0.13

Light hazard level 1 (computer center, computer room, fire control room, etc.) M=V×0.118

Light hazard level 2 (archives, elevated warehouses, etc.) M=V×0.108

The calculation results are still in line with Mu Tianyu's estimates, which is said to be experience. Because Mu Tianyu is an expert in firefighting, the author also said things according to his estimates.

Ultra-fine dry powder fire extinguishing agent can extinguish a large range of fires with only an ultra-small dose.

Of course, Yang Bin used this principle to design and manufacture fire extinguishing bombs.

The advantage of anti-materiel rifles is the accuracy of hitting targets at long ranges, at a distance of 1000 meters, almost zero dispersion point difference.

If it is used to extinguish fires in ultra-tall buildings, all grenades will not fire firearms with such good accuracy.

However, at present in the world, the maximum size of the cartridge for a 20 mm large-caliber anti-materiel rifle is 20 mm by 200 mm. This means that if used for firefighting, the warhead does not carry a lot of extinguishing agents.

Or in other words, the effectiveness of the extinguishing agent must be doubled on the basis of ultra-fine dry powder in order to have practical value.

This puts forward sufficient and necessary prerequisites for large-caliber anti-materiel guns to accurately fire fire extinguishing shells from long distances.

Yang Bin inspected a variety of 20-millimeter caliber anti-materiel sniper rifles in the world, and the results were all disappointing.

Because of the 20 mm by 200 mm bullet, even if the cartridge case is made very short, the limit length of the warhead is only about 15 mm.

The volume of the warhead is, at best, only about 45 grams. 45 grams of ultra-fine dry powder fire extinguishing agent, in fact, can only be hit when the ignition point is accurately seen, and the effect can be achieved.

If you stand on the ground and extinguish the flames on the super high floors, you can accurately enter the room with a counter-weapon gun, but you can't see the fire point, so you can't accurately hit the fire point.

Although it is possible to hit near the ignition point, it also depends on luck, and it is not very certain.

Take the Anzio Mag-Fed, a 20 mm large-caliber giant anti-materiel sniper rifle launched by a company called Anzio in the United States, for example, its maximum range is 4572 meters, which can completely reduce the cartridge case to a quarter of the range in exchange for a larger warhead.

(Thank you for subscribing, and ask for more recommendations, more favorites, and more votes!) ）