JPS6116271Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses a conveyor belt or a direct hopper to transfer dust-generating substances such as flaky sulfur (hereinafter referred to as "dust-generating substances") to the loading platform of a ship or car. This invention relates to a device for preventing the generation of dust during cargo handling operations.

Conventionally, when dust-generating substances were shipped from a truck shipping belt conveyor or directly from a hopper to a truck, there was a drop of about 1 m from the conveyor casing outlet to the truck loading platform, so the material could fall onto the loading platform while falling. The impact caused a huge amount of dust to be generated, which was scattered in all directions, making it impossible to approach the work site without wearing dust-proof goggles and a mask, posing a serious occupational health problem. As a method to prevent such dust generation, for example,
−69278, JP-A No. 51-4771, and JP-A No. 52-
As disclosed in No. 20749, there is a method of applying foam, water, or water and a water-soluble polymer material to a dust-generating substance to prevent the generation of dust, but there is a method to prevent the generation of dust completely. I was not satisfied with that. In addition, there is a suction method using a blower that has been studied in steel works and the like, and this blower suction method is also used to prevent the generation of flaky sulfur dust as described above. The blower suction method is a method in which the generated dust is sucked in with a blower and then separated and collected using a back filter, etc. In order to prevent the generation of flaky sulfur dust, etc., it is mainly done by using a belt conveyor, bucket elevator, etc. in a sealed manner. It is used as a dust countermeasure in structures, and even if a hood is installed especially in areas open to the atmosphere such as shipping ports, there is a limit to the dust suction ability of the blower, so it is expected to effectively prevent dust generation. It is no exaggeration to say that there is currently no solution to preventing dust at the shipping port. Furthermore, the conventional blower suction method naturally requires equipment such as a suction duct, a blower, and a bag filter, resulting in extremely high equipment costs, and requires dust collection work, making the operation extremely complicated. have

In addition to the above-mentioned prevention of dust generation, when working with powder, it is also required to prevent dust explosions and fires within the casing. For this purpose, nitrogen (N ₂ ) gas is blown into the conveyor casing.
It was necessary to control the oxygen (O ₂ )% to below the limit of dust explosion. More specifically, there is a risk of dust explosion in facilities for producing, storing, and shipping flake sulfur, and to prevent this, it is necessary to blow inert gas and control O ₂ % below the explosion limit. However, the conventional blower suction method has the drawback that the inert gas is also sucked by the blower, resulting in an enormous amount of inert gas being required and an extremely high operating cost.

In order to solve the conventional method and device for preventing dust generation, the applicant brings into contact the steam of dust generated in the production, storage and shipping equipment of dust generating substances, and prevents the generation of dust. proposed a method and device (Patent Application No. 53-151070),
The present invention relates to an improvement of said device.

Dust-generating substances, such as flaky sulfur, include agglomerates of various particle sizes, and even if the material guide sliding plate in the device is set at an angle of repose greater than the repose angle of the substance, it is not necessarily the case that all the substances are The material does not necessarily slide down on the guide plate, but may accumulate on the guide plate and become immovable, and the development tends to be facilitated by injecting steam onto the material.

Therefore, the main object of the present invention is to provide a dust generation prevention device that allows dust-generating substances to move smoothly and reliably within the device without stagnation or accumulation within the device.

An object of the present invention is to provide a dust generation prevention device that can prevent dust generation while preventing dust explosions.

An object of the present invention is to provide a dust generation prevention device that is particularly effective in preventing flaky sulfur dust generation.

An object of the present invention is to provide a dust generation prevention device that can prevent dust explosion while using an extremely small amount of inert gas for dust explosion prevention.

Another object of the present invention is to provide a dust prevention device that is easy to operate and inexpensive to install.

The above objects are achieved by arranging a conveyor belt within the device to actively and forcefully transport the dust-generating material. In addition, when the material is flaky sulfur, sulfur and steam are brought into contact with each other, and according to this method, blowing steam into a predetermined equipment increases the temperature inside the equipment and also increases the O ₂ in the equipment. %, thereby suppressing the generation of dust itself and eliminating the possibility of dust explosion. In addition, the humidifying effect of steam also has an anti-static effect, contributing to improved safety. Furthermore, the humidifying effect of steam does not increase the moisture content of the product.

Next, the dust generation prevention device according to the present invention will be explained with reference to the drawings showing one embodiment thereof.

It will be appreciated that the dust generation prevention device 1 illustrated in FIG. 1 is shown integrally or removably attached to the hopper 2.
A dust-generating substance M from production equipment and/or storage equipment (not shown) is fed and stored in the hopper 2, and the dust generation prevention device 1 according to the present invention is provided downward as necessary. Lower loading platform 2 via
At 0, the dust-generating substance M is released, that is, shipped.

The dust generation prevention device 1 has a casing 3 which is integrally or removably connected to the hopper 2 as described above, and a dust generating material shipping port 4 is provided at the lower end of the casing 3. Also, inside the casing 3, the hopper gate 5 of the hopper 2
A first belt conveyor 6 for receiving dust-generating substances M discharged and falling from the first belt conveyor 6 is provided to be inclined downward. The first belt conveyor 6 is composed of an endless belt 9 wound between a driving pulley 7 and a driven pulley 8 and moving in the direction of the arrow. That is, the endless belt 9 is made to coincide with the natural falling direction of the material M dropped onto the belt conveyor 6. Therefore, the substance M slides down in the direction of inclination of the belt conveyor 6 due to its own weight, and is forcibly conveyed downward by the belt conveyor 6. Therefore, even if the dust-generating substance M tends to accumulate due to its nature, it is forcibly moved downward by the belt conveyor 6.

A second belt conveyor 10 is arranged to be inclined downward in order to receive the dust-generating material M conveyed and falling from the first belt conveyor 6 and further convey it downward. The structure of the second belt conveyor 10 is similar to that of the first belt conveyor 6.
It is constructed by winding an endless belt 13 around a driving pulley 11 and a driven pulley 12 in the same way as in the structure shown in FIG. Further, a third belt conveyor 14 is arranged to be inclined downward in order to receive the dust-generating material M conveyed and falling from the second belt conveyor and direct it to the shipping port 4 of the device 1. .
The third belt conveyor 14 has a structure in which an endless belt 17 is wound between a driving pulley 16 and a driven pulley 6 in the same manner as the first and second belt conveyors 6 and 10. The shipping port 4 is preferably provided with exit plates 18 and 19 made of rubber;
One end of each is fixed to the shipping port part casing 3,
The other free ends of the outlet plates 18 and 1 normally abut each other to hold the outlet 4 closed.
When the dust-generating substance M is dropped onto the third belt conveyor 14, the rubber plate is bent by the weight of the substance, and the substance M is caused to fall into the shipping port 4.

The first, second and third belt conveyors 6, 1
Spray nozzles 21 to 25 are provided facing the conveying surface that carries and conveys the dust-generating substances M of Nos. 0 and 14. At this time, the spray openings of the spray nozzles 21 to 25 are naturally arranged to inject steam onto the dust-generating substances conveyed by the first, second, and third belt conveyors. In the drawing, one spray nozzle is arranged for the first belt conveyor 6, and two spray nozzles are arranged for the second and third belt conveyors 10 and 14, respectively.
It will be understood that the present invention is not limited thereto, and that any size, shape, number, and arrangement may be used as desired.

To further explain the above structure in detail, each belt conveyor has an angle greater than the angle of repose of the falling material, so that most of the material can slide down on the belt even if the belt conveyor does not rotate. is desirable. Furthermore, the conveying speed of the belt can be slower than the sliding speed of the dust-generating substance M, and therefore, even if substances accumulate on the belt, the substances can be forcibly conveyed downward. .

When the dust-generating substance M is, for example, flaky sulfur, the angle of repose of sulfur is considered to be 35 to 45 degrees, so the angles α between the conveyor and the horizontal were all set to 45 degrees or more. The preferred spray nozzle was TYPE 1/2 x 225 manufactured by Niikura Kogyo, made of SUS304, and wide-angle circular full-surface spray 1/2B. This nozzle generates very low static electricity due to steam jetting (maximum 400V at a source pressure of 6Kg/cm ² G) and is safer than a drilled hole (more than 60,000V at a 3mmφ hole and a source pressure of 6Kg/cm ² G). It is superior in terms of both aspects and wide-angle injection of steam is also possible.

Next, the operation mode of the dust generation prevention device according to the present invention will be explained.

As already understood from the above description, hopper 2
When the dust-generating material M falls from the hopper gate 5, the material M falls onto the first belt conveyor 6 and is then transported to the shipping port 4 via the second and third belt conveyors 10 and 14. During the transport process, the dust-generating material M is sprayed by the spray nozzles 2.
Steam is injected through nozzles 1 to 25. Therefore, most or all of the material M being conveyed and sliding down is moistened by the steam, and the rising of dust is completely prevented inside the casing 5 and also when the material is discharged to the outside from the casing 3. Furthermore, since steam is lighter than air and _N2 gas, the casing is filled with the steam, and therefore even if a small amount of dust is generated inside the casing, the dust comes into contact with the steam, becomes heavy in apparent weight, falls, and mixes with the powder, and does not remain suspended for long.
There is a concern that steam may escape from the upper drop port 5 and the lower outlet 4, but in reality both ports are substantially blocked by the continuously moving material M, and the escape of steam is extremely small.
The amount of _N2 gas that flows into the housing through the pipe 30 and escapes to the outside is also extremely small, so that the amount of _N2 gas supplied can be significantly reduced. The pipe 30 can also be used to remove steam from inside the casing.

The steam used in the present invention is preferably about
at a pressure in the range of 0.2 Kg/cm ² G to about 3 Kg/cm ² G, more preferably in the range of about 0.3 Kg/cm ² G to about 1 Kg/cm ² G, and at a temperature of about 130° C. to about 1 Kg/cm 2 G. It is in the range of 150℃. In addition, if the dust-generating substance is flaky sulfur, steam will reduce the amount of sulfur to about 100 tons/hr.
It is preferred to spray at a rate of 100 Kg/cm ² to about 150 Kg/cm ² .

The dust generation prevention device according to the present invention configured as described above can completely prevent the generation of dust, and injecting steam tends to lower the O ₂ % inside the casing, which reduces the relative Increased humidity makes it easier for static electricity to leak, and both of these have the extremely excellent effect of preventing dust from exploding. Furthermore, it has the effect that it is possible to reliably transport dust-generating substances that tend to accumulate on the transport means and have a large particle size range and cause accumulation to occur very easily.

In the above explanation, the dust generation prevention device according to the present invention was only explained in the manner connected to a hopper, but it can also be connected to the shipping port of a belt conveyor conveyance device that directly conveys dust-generating substances from production equipment, etc. An example of this is illustrated in FIG.

In the embodiment shown in FIG. 2, the dust generation prevention device according to the present invention is connected to a belt conveyor conveyance device 50, and the inlet portion 5 of the dust generation prevention device has two rubber partition plates 32 and 32. and 34 are provided. The partitioning rubber plates 32 and 34 are attached at one end to the casing 3 by attachment angles 36 and 38, and the other free ends abut each other when the sulfur M is not conveyed by the conveying device 50. configured to do so. When the sulfur M is conveyed, the tips of the partition rubber plates 32 and 34 bend due to the weight of the sulfur M, and the tips of the two plates are separated and the sulfur falls into the first belt conveyor through the gap.
The operation mode thereafter is the same as that of the first embodiment. It will be understood that the second embodiment also has two rubber partition plates at the inlet and outlet of the sulfur M, so that the effect of confining the steam within the casing is excellent.

In the above description, the present invention was applied to an apparatus for conveying flaky sulfur using a hopper or a belt conveyor, but the present invention is not limited to these embodiments, and can be applied to other materials other than sulfur. It will be understood that the same can also be applied.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a first embodiment of a dust generation prevention device embodying the present invention. FIG. 2 is a schematic sectional view of a dust generation prevention device according to a second embodiment of the present invention. 1: Dust generation prevention device, 2: hopper, 3: casing, 4: outlet, 5: inlet, 6, 10, 14:
Belt conveyor, 18, 19: Exit plate, 32, 3
4: Entrance plate, 50: Belt conveyor transport device.

Claims (1)

[Claims for Utility Model Registration] 1. A casing provided with an inlet through which material is brought in and an outlet through which the material is sent out; A first belt conveyor provided to be inclined in a direction; a first belt conveyor which is inclined in an inclination direction opposite to the inclination direction of the first belt conveyor in order to receive the material that has slid down and/or been conveyed on the first belt conveyor; a second belt conveyor provided on the second belt conveyor; inclined in the same direction as the first belt conveyor in order to receive the material that has slid down and/or been conveyed on the second belt conveyor and guide it to the casing outlet; A dust generation prevention device comprising: a third belt conveyor extending to a casing outlet; and steam injection means provided facing the first, second and third belt conveyors. 2. The dust generation prevention device according to claim 1, wherein the material is flaky sulfur. 3. The dust generation prevention device according to claim 1, wherein each belt conveyor is attached to the casing at an angle greater than the angle of repose of the material. 4. The outlet of the casing is provided with a pair of opposing and downwardly inclined rubber plates, each of which is attached at one end to the casing and whose free edges at the other end resiliently abut against each other under normal conditions. The dust generation prevention device according to claim 1 of the utility model registration claim, which is constructed so as to match the above. 5 Steam is approximately 0.2Kg/cm ² G to approximately 3Kg/cm ² G
and a temperature in the range of about 130°C to about 150°C.
Dust generation prevention device as described in section. 6. The dust generation prevention device according to claim 5, wherein the steam has a pressure in the range of about 0.3 Kg/cm ² G to about 1 Kg/cm ² G. 7. The dust generation prevention device according to claim 2, wherein the steam is injected at a rate of about 100 Kg/cm ² to about 150 Kg/cm ² to 100 tons/hr of flaky sulfur.