A water-based fire extinguishing agent for extinguishing pulverized coal smoldering deep fires and its preparation method

Abstract

The invention relates to a water-based fire-extinguishing agent used for extinguishing a coal powder smoldering deep fire disaster and a preparation method. Two surface active agents are added in thewater-based fire-extinguishing agent so that the coal powder surface can be quickly wetted through the fire-extinguishing agent, fire disaster spreading due to the fact that the fire-extinguishing agent drifts and moves on the coal powder surface is effectively avoided, the fire-extinguishing agent can be quickly permeated into coal powder, the internal smoldering fire disaster is cooled to be completely extinguished, and reburning is prevented accordingly. According to the water-based fire-extinguishing agent, the surface active agents capable of improving the permeability of water in the cola powder are added, the permeating speed can be remarkably increased, the types of the surface active agents are reduced, and thus the problem that additives are reacted mutually, and thus sediments are generated, so that the fire-extinguishing property is influenced can be avoided; and inorganic salt ions are not introduced, corrosion of a fire-extinguishing agent solution to a device is avoided,and under the precondition that the fire-extinguishing effect is ensured, storage and transporting are easier.

Description

technical field [0001] The invention belongs to the technical field of fire protection, and relates to a water-based fire extinguishing agent; in particular, it relates to a water-based fire extinguishing agent and a preparation method for deep fires caused by smoldering pulverized coal. Background technique [0002] Coal is a common fossil fuel and plays an important role in production and life. Its molecules are mainly aromatic structural units, and also contain oxygen-containing functional groups such as hydroxyl and carboxyl. In industrial production, it is often used in the form of coal powder (with a particle diameter range of 0-1000 μm) and stored in a stacked manner. Because the pulverized coal particles are very fine, the pulverized coal per unit mass has a large surface area, which can absorb a large amount of air, and can be ignited with relatively low energy. This kind of pulverized coal stored in stacks is prone to smoldering in deep layers. [0003] Smoldering...

AI Technical Summary

Problems solved by technology

However, pulverized coal is special. Pulverized coal is a solid particle medium with a particle size mostly between 20μm and 500μm. And the pore size is too small, it is difficult for the microemulsion to wrap the coal powder particles or particle groups to extinguish the fire

[0010] Patent 201310255591.2 discloses a high-permeability water-based fire extinguishing agent for extinguishing pulverized coal fires. However, there are many types of additives in the fire extinguishing agent formula, and the product is unstable. After a period of time, precipitation will occur, which will affect the fire extinguishing performance. There are many inorganic salt ions in it, which is easy to corrode fire extinguishing equipment and is not easy to store

[0011] Patent 201610118245.3 discloses a fire extinguishing agent for Class A fires, but this patent is aimed at Class A fires, and abundant foam will be generated during use, which is not conducive to penetrating into the pile of fine coal powder

Moreover, the cost of the fire extinguishing agent is high and the process is complex