JPS6139706Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to powder accumulation equipment, and more particularly to a powder accumulation equipment that prevents dust in the powder accumulation means from exploding.

For example, when manufacturing metal powder, coal powder, wood powder, flour, etc., or storing these powders in hoppers, silos, warehouses, etc., or transporting these powders by tank cars, etc. In such a case, in such a powder accumulating means, friction between floating powder particles or electrostatic discharge may spontaneously ignite and cause an explosion.

In order to prevent this from happening, the powder accumulating means may be filled with an inert gas such as nitrogen, or the temperature within the powder accumulating means may be adjusted, for example.
By keeping the temperature sufficiently lower than the ignition temperature of dust,
Alternatively, a combination of these methods may be considered, but in the case of the former, if the inert gas leaks into the surrounding area, there is a risk of oxygen deficiency in the surrounding workers; However, large-capacity cooling equipment is required, which poses an economical problem.

In view of these problems, the present invention is designed to reliably prevent dust explosions in the powder accumulation means using safe and relatively inexpensive equipment costs. It will be explained below based on this.

FIG. 1 shows a first embodiment of the present invention, in which numeral 1 indicates a dust generating location such as a shotplast workshop, an ingot case care workshop, a slab grinder workshop, a crushing workshop, etc. Cover the generation location 1 with a hood 2, suck the dust inside the hood 2 through a duct 3 and a blower 4, and then pass through a duct 5 and collect the dust with a dust collector 6. The cleaned air is then sent to a duct 7 and a blower 8. After that, it is discharged from the chimney 9.

The dust collected by the dust collector 6 is accumulated in a hopper 10 as a powder accumulation means at the lower part of the dust collector 6.

Note that 10a is a discharge screw conveyor provided at the lower end of the hopper 10.

A dry ice generating means 11 is provided near the dust collector 6, and the dry ice (powder) produced by the dry ice generating means 11 is passed through a blower 12 and an injection pipe 13 to the It is fed into the hopper 10.

Carbon dioxide gas is generated from the dry ice supplied into the hopper 10, which lowers the oxygen concentration within the hopper 10 and lowers the dust temperature and ambient temperature within the hopper 10, thereby causing ignition of the dust.
Prevent explosion.

FIG. 2 shows a second embodiment of the present invention, in which 21 is a tank truck as a powder accumulation means for collecting the dust in the hopper 10, and a suction hose provided in the tank 22 is shown in FIG. 23, the discharge screw conveyor 1 in the hopper 10
By connecting to 0a and operating the blower 24, the baggage filter 25 in the tank 22 is
The dust in the hopper 10 is collected into the tank 22 through the hopper 10.

This tank car 21 is provided with a dry ice generating means 26, and by injecting the dry ice produced by this dry ice generating means 26 into the tank 22 through an injection pipe 27, the above-mentioned Similarly, prevent dust ignition and explosion.

Note that even when the powder is piled up in bulk in a warehouse, for example, dry ice generating means may be provided inside or outside the warehouse, and the produced dry ice may be appropriately sprinkled onto the powder piled in bulk.

As described above, according to the present invention, the oxygen concentration and the dust and atmospheric temperature can be efficiently reduced simultaneously by the simple and unique method of supplying powdered dry ice into the powder accumulation means. It is possible to safely and sufficiently ignite dust without necessarily lowering the oxygen concentration to an oxygen-deficient concentration.
It can prevent explosions.

Furthermore, the dry ice is supplied in the form of powder and gradually sublimes in the powder accumulation means to generate carbon dioxide, which is a gas heavier than air, which suppresses dust diffusion and convection. It can be cooled to a temperature well below the ignition temperature of dust, is effective with a small volume, and has a long-lasting effect.

Therefore, there is no need for a conveyor for cooling, and there is no need for any post-processing equipment, so explosions of dust in the powder accumulating means can be reliably prevented with relatively low equipment costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention;
FIG. 2 is a schematic diagram showing a second embodiment of the present invention. 6... Dust collector, 10... Hopper, 11...
Dry ice generation means, 21...Tank car, 26
...Dry ice generation means.

Claims (1)

[Scope of utility model registration request] Powder accumulation equipment comprising a combination of powder accumulation means and dry ice generation means for supplying dry ice into the powder accumulation means.