RU2366479C1 - Aggregate for manufacturing of powder composition based on mineral salts for extinction of fires of various classes - Google Patents

Abstract

FIELD: explosives.

SUBSTANCE: aggregate for manufacturing of powder mixes based on mineral salts includes tank for wet raw material input, crushing grate plant, dryer, transportation devices, grinder for solid mineral salts, water repellent mixers modifying surface or reduced mix with disperse additives by fluid water-repellent agents, heated vortex mixer for thermal processing, separator and dosage device.

EFFECT: manufacturing of powder mixes for application in extinction of fires of various classes.

1 dwg

Description

The present invention relates to the field of fire extinguishing agents used to extinguish fires of various combustible materials, and methods for producing fire extinguishing powder compositions (OPS).

In foreign patent literature there is no information on the manufacturing technology and hardware design of the process for producing fire extinguishing powder compositions. Mainly describes the preparation of the active component. Separate operations, devices and circuits used in the preparation of extinguishing powder compositions are given below.

The Ecohimmash enterprise has created the production of OPS, which includes the technological stages: preparation and drying of raw materials, grinding of components, classification with the return of large particles to grinding, mixing the main component with additives. Ball mills, impact mills, pre-crushers, centrifugal mixers, published in the materials of the XV Scientific and Practical Conference, Ministry of Internal Affairs of the Russian Federation, VNIIPO, 1999, are used for grinding.

The technological scheme for the production of multi-purpose fire extinguishing powder "Pirant-A" is described in the journal Chemical Industry, 1989, No. 4, pp. 36-39 and taken by the authors as a prototype.

The disadvantages of the prototype include:

- the presence of the operation of dissolving the starting salts and the need to remove the solvent, which is associated with high costs of steam and gas, the use of special combustion apparatuses and a rather complicated spray dryer;

- increased wear of crushing bodies (fingers of the dismembrator), significant energy consumption;

- when grinding in a vibratory mill there is a significant increase in temperature, which is unacceptable for a number of materials; in addition, to prevent the transmission of vibrations to the floor of the room where the mill is mounted with an electric motor, it is necessary to perform structural elements that exclude them; wear of grinding bodies (balls).

The technical task of the invention is the exclusion from the technological scheme of the stage of dissolution of mineral salts of OPS, the use of grinders that do not have friction in the grinding zone, expanding the possibilities of manufacturing OPS for extinguishing various classes of fires.

The technical result is achieved due to the fact that the installation for the production of a powdered composition based on mineral salts for extinguishing various classes of fires contains a container for receiving raw materials, transportation pumps, metering pumps, mixers, a dryer, battery cyclones, bins, grinders, classifier, device packaging, characterized in that it contains a hopper for receiving wet powdery feedstock, combined with a crushing and wiping apparatus, a fluidized bed dryer with a loader and a a loader, a vortex mixer with a screw feeder, a grinder - a grinding-vacuum unit made in the form of a jet-shock mill and equipped with a dosing device for technological additives and devices for two-stage hydrophobization, containing pumps, humidifiers and evaporators for hydrophobizing liquid, two parallel-mounted water-repellent mixers with a device for introducing technological additives and a unloader, a vortex mixer with a jacket for heating, a hopper, a separator and a filling device for four items tion.

The drawing shows a diagram of the proposed installation for the preparation of powder mixtures based on mineral salts used as compositions for extinguishing various classes of fires.

1 - crushing and wiping apparatus with a hopper for receiving the initial (wet) raw material - mineral salt;

2 - unloader of wet raw materials;

3 - cyclone;

4 - vacuum pump;

5 - drum feeder;

6 - SK dryer;

7 - unloader of dry raw materials - mineral salt;

8 - container (mobile, portable);

9 - floor scales;

10 - vortex mixer SVP-900;

11 - screw feeder with a hopper;

12 - evaporator;

13 - heat exchanger for heating air;

14 - air heater;

15 - grinding and vacuum installation;

16 - a system of cyclones;

17 - a lock lock;

18 - container mixer (KS);

19 - evaporator;

20 - humidifier;

21 - unloader of a mixture of mineral salts with additives;

22 - wet filter;

23 - vortex mixer SVP-3800;

24 - the hopper of the finished product;

25 - separator S-900;

26 - packaging device;

27 - drying cabinet for small amounts of additional components;

28 - electric hoist.

The initial wet mineral salt enters the crushing and wiping apparatus 1, from where it is transferred by vacuum transport to the unloader 2 and from it to the dryer with a fluidized bed by a drum feeder 6. Upon reaching the required moisture, it enters the unloader of dry raw materials 7 and is packed in a container 8 with fixation weights on a floor scale 9. This sample is loaded into a vortex mixer 10 SVP-900 and fed by a screw feeder 11 to the grinding-vacuum unit (PVU) 15 for grinding. PVU is a jet-shock mill, consisting of several series-mounted grinding chambers, interconnected by booster pipes. Inside each chamber, grinding plates are installed perpendicular to the flow of the dust-air mixture to be crushed, hitting them, the initial powder is subsequently crushed, accelerating in the accelerating pipes. Grinding is carried out in a stream of dried air entering through a heat exchanger 13 and through an evaporator 12 filled with a hydrophobizing liquid, the vapors of which are entrained in air and prevent particle agglomeration during grinding. The crushed mixture is deposited in three cyclones 16 and in portions through the lock gate 17 it continuously enters the mixer container (CS) during the grinding process 18. A calculated sample of mineral salt / salts is loaded into the mixer, a dispersed technological additive is introduced, and the mixture is mixed and simultaneously coated water-repellent liquid in the vapor phase with preliminary wetting. The mixture is humidified before the hydrophobizing liquid is supplied, for which the water in the humidifier 20 is heated to a temperature of (50 ± 5) ° С and the air pressure is created in front of the humidifier 0.06-0.07 MPa to create the necessary moisture content. Next, the mixture is hydrophobized by supplying a hydrophobizing liquid from the evaporator 19. The treated mixture is discharged into the unloader 21 and then into the vortex mixer 23 SVP-3800, where the mixture is heat treated. After cooling, the finished mixture through the separator 25 C-900 enters the packaging device 26. In the case of mineral salts with acceptable moisture, they are loaded from the container 8 into the vortex mixer 10.

As a result of the application of the proposed installation in comparison with the prototype, the stage of dissolution of the starting salts and the need to remove the solvent are excluded. A rather complicated spray dryer is replaced by a fluidized bed dryer.

The use of a grinder, which does not have metal-metal friction pairs in the grinding zones and the impact of metal elements on the crushed material, eliminates the wear of the working bodies and the formation of namol polluting the mixture.

The experiments were conducted at the Perm Perm Powder Plant FKP, which led to a positive result.

Claims (1)

A plant for the production of a powdered composition based on mineral salts for extinguishing various classes of fires, containing a container for receiving raw materials, transportation pumps, metering pumps, mixers, a dryer, battery cyclones, silos, choppers, a classifier, a packaging device, characterized in that it contains a hopper for receiving wet powdery feedstock combined with a crushing and wiping apparatus, a fluidized bed dryer with a loader and unloader, a vortex mixer with a screw pi Atelier, shredder - a grinding-vacuum installation made in the form of a jet-shock mill and equipped with a dispenser of technological additives and devices for two-stage hydrophobization, containing pumps, humidifiers and evaporators for hydrophobizing liquid, two parallel-mounted water-repellent mixers with a device for introducing technological additives and unloader, vortex mixer with heating jacket, hopper, separator and filling device for four positions.

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