How should the fire-fighting water demand for polysilicon projects be determined?

Firefighting water is essential. Although some materials cannot come into direct contact with water, in the event of an accident, water can be used for cooling purposes. It is also needed to clean equipment and floor surfaces

Cleaning equipment and water on the ground surface are included in the production costs; cooling water for irrigation areas is not necessary. Using cooling water in case of a fire will inevitably lead to reactions. I have set the amount of water required for firefighting based on the water usage of the process equipment, at 100 L/s. What do you think? Is that acceptable?

When producing polysilicon, water must not be used to extinguish fires in the event of a leak, but it can be used for things like cleaning the floor.

The fire-fighting water volume in polysilicon plants is intended for use in the fire suppression systems of auxiliary buildings. Fire foam is available at large material storage tanks, but this type of foam contains a high amount of water. The purpose of the foam is to prevent the materials from coming into contact with air, as well as to ensure that water does not come into contact with the materials. As for the exact components of this foam, it would be necessary to consult experts

I really don’t know about this. I’ve always thought that there’s no need to consider foam fire extinguishers; it seems that safety measures also suggest using dry powder or dry sand for initial firefighting, and only resorting to water when the fire gets out of control. Moreover, the water flow rate is significant; it’s estimated that even for smaller systems, the flow rate is around 100–200 L/s. It’s really difficult to apply chemical industry fire safety regulations to polysilicon. Please, experts, continue the discussion!

What is the principle of foam fire extinguishing? Foam is a group of small bubbles whose surfaces are surrounded by air. Fire-fighting foam is an aqueous solution of a foaming agent that is formed by incorporating a large amount of gas through physical and chemical processes. The density of foam is much lower than that of oil, allowing it to float on the surface of the oil and form a continuous foam layer. Through cooling, suffocation, and obstruction, fire extinguishment is achieved via the following physical mechanisms. 1. Cooling effect. The temperature of the fuel surface heats the covering foam, causing the water in the foam to vaporize; this process absorbs the heat from the fuel surface at the point of contact, thereby reducing its temperature. As more foam is applied continuously, a layer of foam forms on the cooled fuel surface. Due to the diffusive flow of the foam on the fuel surface, the area of the foam layer continues to increase, and the surface area of the cooled fuel also grows larger, until the entire fuel surface is covered by the foam layer. After the fuel surface is covered by foam, heat exchange between the foam layer and the fuel surface continues unabated. At the interface where the foam layer comes into contact with the fuel, the water content in the foam continuously evaporates and decreases. Since the surface of the fuel has not been sufficiently cooled, the fuel continues to evaporate at a certain rate and penetrates through the foam layer to burn above it. The fire size decreased significantly as the evaporation rate of the fuel was suppressed by the foam layer. As more foam is supplied, the thickness of the foam layer gradually increases. The liquid that precipitates from the foam layer moves continuously downward, increasing the water content in the foam at the lower part of the layer that is in contact with the fuel, thereby accelerating the cooling effect on the fuel surface. When the thickness of the foam layer increases to a certain level, and the fuel surface is cooled to such an extent that the steam generated is insufficient to sustain combustion, the flame is extinguished. The cooling rate of the metal materials in oil storage tanks is slow, which means that the \"edge fire\" at the tank walls often takes a long time to be completely extinguished. In short, during the extinguishment of protein foam fires, cooling is an ongoing process and plays a dominant role in extinguishing the fire. 2. Asphyxiation effect. The asphyxiating effect of foam is primarily manifested in its ability to reduce the oxygen concentration on the surface of the fuel, until the fuel is completely separated from the atmosphere (oxygen). This effect begins as soon as the foam is applied to the fuel surface. The foam is affected by the hot fuel surface as well as the thermal radiation from the flame; the moisture in it vaporizes on the fuel surface, and the resulting water vapor reduces the oxygen concentration near the fuel surface, weakening the intensity of the flame. This facilitates the accumulation of foam on the fuel surface and the formation of a foam layer, which ultimately prevents the supply of oxygen necessary for combustion. 3. Blocking effect. During the foam fire extinguishing process, the foam separates the fuel surface that has been covered from the flames of the fuel that has not yet been covered by foam. This prevents direct contact between the flames and the fuel surface covered by foam, as well as blocking the thermal radiation from the flames onto that portion of the fuel surface. This helps enhance the cooling effect of the foam and also contributes to strengthening its smothering effect.

(Z, 3%) (YEZ6, 3%) Environment-friendly medium-expansion foam extinguishing agent. This extinguishing agent is a general-purpose synthetic medium-expansion foam that can be used with various types of medium-expansion foam generators. It is widely employed for fire prevention and suppression in underground tunnels, airports, underground oil depots, garages, ships, coal mines, and confined spaces. It is particularly effective when used to cover large areas of water-insoluble flammable and combustible liquids. ■ Mixing ratio: The mixing ratio of YEZ3 type with water is 3:97, while that of YEZ6 type with water is 6:94. As we know, water reacts with TCS to produce H2; the most basic method of firefighting is to extinguish the source of fire! By adding water, aren’t you just increasing the source of fire? ? ? ? So I think polysilicon plants or trichlorosilane plants can use dry powder fire extinguishers and water fire extinguishers. Dry powder is used in medium environments, while water is used in construction. This post was last edited by “BlowYouUpLikePigHead” on 2009-3-22 at 14:55.]

I agree with your analysis! So, what do you think is a reasonable way to determine the water volume required for fire suppression? For example, in many projects, the specifications for chemical plants specify that the water flow rate from fire hydrants in production areas should be 150 L/s. . .