JPH027855B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing the generation of dust generated during cargo handling operations using a belt conveyor, etc., and particularly for conveying flaky sulfur to a truck bed using a belt conveyor. It can be effectively applied in many cases.

Conventionally, when flaky sulfur was shipped to a truck using a truck shipping belt conveyor, there was a drop of about 1 m from the conveyor casing outlet to the truck loading platform. The impact generated an extremely large amount of dust, 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 device for preventing the generation of such dust, there is a suction device using a blower, which has been researched in steel works, etc., and this blower suction device is also used to prevent the generation of flaky sulfur dust as described above. There is. The blower suction device is a device that sucks the generated dust with a blower, then separates and collects the dust with a bag filter, etc., and collects it.In order to prevent the generation of the flaky sulfur dust, etc., it is mainly used in closed belt conveyors, bucket elevators, etc. 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.
It is no exaggeration to say that effective prevention of dust generation cannot be expected, and that there is currently no solution to preventing dust at the shipping port. Furthermore,
Conventional blower suction devices naturally require the installation of a suction duct, a blower, a bag filter, etc., and have problems such as extremely high installation costs, the need for dust collection work, and extremely complicated operation.

Furthermore, in operations involving powder, it is required to prevent dust explosions and flames within the casing, in addition to preventing dust generation. For this purpose, nitrogen (N ₂ ) gas is blown into the conveyor casing.
It was necessary to control the oxygen (O ₂ )% to 7%, below the dust explosion limit (9%).
More specifically, there is a risk of dust explosions in the production, storage, and shipping facilities for flaky sulfur, and to prevent this, inert gas is blown in and O ₂ % is reduced to the explosive limit (9.3% when using N ₂ gas, In addition, when using _CO2 gas, it must be controlled to 12% or less. However, according to the traditional blower suction device,
Inert gas is also sucked in by the blower, so the required amount of inert gas is enormous, resulting in extremely high operating costs.

Furthermore, as a technology to prevent dust generation, water is sprayed onto the material being conveyed, and in order to sufficiently moisten the conveyed material and prevent the generation of dust, a large number of small hole nozzles are installed on the discharge side of the conveyor system to form pressurized water into water droplets. A device that sprays the material with water has also been proposed, but although such a dust generation prevention device can prevent the generation of dust, the transported material itself contains a large amount of moisture, making it difficult to handle the material in the future. In some cases, it was necessary to provide an additional drying step to dry the material.

SUMMARY OF THE INVENTION Accordingly, the main object of the present invention is to provide a novel flaky sulfur dust prevention device that overcomes the drawbacks of conventional dust generation prevention devices.

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

The object of the invention is to avoid substantially changing the moisture content of the material to which it is applied, thus complicating further handling of the material, and without requiring subsequent additional additions such as drying steps. An object of the present invention is to provide a device for preventing the generation of flaky sulfur dust that does not require the above steps.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flake-like sulfur 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 device for preventing generation of flaky sulfur dust, which is easy to operate and has low equipment cost.

The present inventors have discovered that by bringing heated steam into contact with dust generated in production, storage, and shipping facilities for flaky sulfur materials that generate dust, to the extent that the moisture content of the material does not change, It has been found that dust generation can be prevented extremely efficiently.
The present invention has been made based on this new knowledge.

To summarize the present invention, the present invention provides a casing provided with an inlet through which flaky sulfur is introduced and an outlet through which the flaky sulfur is delivered; are arranged opposite each other with downwardly converging slopes to receive the shaped sulfur, and the lower free ends of each are resiliently abutted against each other under normal conditions, and the other upper ends are a pair of rubber plates respectively attached to the casing; receiving falling flaky sulfur by pushing and spreading the abutting free ends of the pair of rubber plates, and directing the flaky sulfur to the casing outlet; A slanted board installed to guide the slanted board; equipped with a heated steam injection means provided facing the slanted board, and a flake-like material that has slid down on the slanted board from the heated steam injection means; Sulfur is heated with heated steam at a pressure in the range of about 0.2 Kg/cm ² G to about 3 Kg/cm ² G and a temperature in the range of about 130°C to about 150°C at a rate of about 100 Kg/hr for 100 tons/hr of flaky sulfur. ~about
This is a flaky sulfur dust generation prevention device that sprays at a rate of 150Kg/hr to prevent dust generation.

In the apparatus of the present invention, sulfur and steam are brought into contact with each other, and blowing the steam into a predetermined equipment increases the humidity within the equipment and also increases the humidity within the equipment.
It lowers O ₂ %, thereby suppressing the generation of dust itself and eliminating the possibility of dust explosion. In addition, the humidifying effect of steam inside the equipment also has an anti-static effect, contributing to improved safety. Furthermore, the humidifying effect of the heated steam inside the equipment does not increase the moisture content of the product.

Next, the apparatus for preventing generation of flaky sulfur dust according to the present invention will be explained with reference to the drawings.

First, a similar flaky sulfur dust generation prevention device that forms the basis of the flaky sulfur dust generation prevention device according to the present invention will be described with reference to FIGS. 1 to 3. It will be appreciated that the apparatus is embodied in a shipping facility that ships sulfur flakes to the bed of a truck using a conveyor belt. The shipping equipment includes a transport device 1 for transporting flaky sulfur M from production equipment and/or storage equipment (not shown) to a loading platform T of a truck, and a frame 5 for supporting the transport device. The conveying device 1 can be of a belt conveyor type, which is usually used in the industry and includes a conveyor belt 2 and a pulley 3. A flake-like sulfur dust generation prevention device 10 is provided at the sulfur discharge end of the shipping equipment, that is, at the right end where the pulley 3 in FIGS. connected. The flaky sulfur dust generation prevention device 10 is a conveyor device 1
comprising a casing 12 surrounding a discharge end of the
At the lower end is a shipping port 1 for powder, e.g. flaky sulfur M.
4 is provided. Inside the casing 12, there is a first slanting plate 16 that is inclined downward to receive the sulfur M that is conveyed by the conveyor belt 2, goes around the pulley 3 at the discharge end, and naturally falls downward. It will be established. The sulfur M that has fallen onto the first barrier board 16 is transferred to the first barrier board 16 and the guide plate 1 provided opposite to the upper surface of the first barrier board 16.
8 and 20 and slide down. As shown in FIG. 3, the guide plates 18 and 20 have a width dimension W ₂ at the lower end, that is, a dimension at the outlet end of the sulfur M, and a width dimension at the upper end, in order to restrict the traveling width of the falling sulfur M. It is attached so that W ₁ is smaller than the dimension of the inlet end of sulfur M. Rubber plates 22 and 24 are provided at the lower end of the first barrier plate 16 so that the lower end edges of the guide plates 18 and 20 and inner edges 26 and 28 are approximately aligned. The other end of the rubber plates 22 and 24, i.e.
The free lower end is also provided with a second barrier board which is arranged so as to slope downward inside the casing 12 and block the path of the sulfur M sliding down on the first barrier board 16. It is in contact with the upper surface of 30. Therefore, the lower edge of the first guide plate 16, the guide plate 1
8, 20, the inner edges of the rubber plates 22, 24, and the upper surface of the second stylus plate 30.
A drop opening 21 (FIG. 3) into the Nojiyama cutting board 30 is defined. The rubber plates 22 and 24 provided at the tips of the first barrier plate 16 are used to prevent sulfur particles and powdered sulfur that have passed over the guide plates 18 and 20 from being accumulated on the rubber plates 22 and 24 due to long-term use. In this case, the rubber plate bends due to the weight of the sulfur, and the second bending plate 30
It separates the sulfur from above and causes the sulfur above it to fall downward.

As shown in FIG. 2, the second barrier plate 30 has an upper end attached to the inner wall of the casing 12, extends obliquely downward, and connects the rubber plates 22, 22.
and further protrudes obliquely downward by a predetermined distance. Therefore, the sulfur M that has slid down the first barrier board 16 and fallen through the drop port 21 falls onto the upper surface of the second barrier board 30, and then flows downward along the second barrier board 30. slip down. When the sulfur M on the second barrier plate 30 reaches the lower end of the second barrier plate 30, it is then transferred onto a third barrier plate 32 provided at a distance from the lower end of the second barrier plate. and falls. The third barrier plate 32 is also provided in the casing 12 so as to be inclined downward.
The sulfur M that has fallen onto 2 is guided to the shipping port 14 of the casing 12. The sulfur M released from the third barrier plate 32 to the shipping port 14 is transferred between the third barrier plate 32 and the shipping port 14 before being released from the shipping port 14.
and onto the exit plates 34 and 36 provided between them. Outlet plates 34 and 36 are preferably rubber plates that, when sulfur is not on the outlet plates, abut each other and are held closed, as illustrated in FIG. As sulfur is dropped onto the plates 34 and 36, the weight of the sulfur causes the rubber plates to flex, allowing the sulfur to fall into the shipping port 14.

The tip of the first jiyama board 16 and the third jiyama board 3
A partition plate 38 is provided between the tips of the two. Therefore, inside the casing 12, a first chamber 40 surrounded by the first barrier plate 16, the second barrier plate 30, and the partition plate 38; the second barrier plate 30, the casing 12, and the third chamber 40; Jiyama board 32 and exit board 34,
A second chamber 42 surrounded by 36 is defined. Spray nozzles 44, 46 and 48, 50 are disposed in the first chamber 40 and the second chamber 42, respectively. At this time, the injection ports of the spray nozzles 44 and 46 are arranged so as to face the second barrier plate 30, and the spray nozzles 48 and 50 are arranged so as to face the third barrier plate 32. Further, the spray nozzles can be of any size, shape, and number as desired, but for example, as shown schematically in FIG. 3, the upper spray nozzles 44 of the first chamber 40 have three and the remaining spray nozzles 46 in the lower stage of the first chamber 40 and the upper and lower stages of the second chamber 42.
, and 48 and 50 may each be provided in five pieces.

Furthermore, if we specifically explain the above structure,
First, second and third jamb boards 16, 30 and 3
2 and the partition plate 38 are preferably made of stainless steel plate (for example, SUS304), and the angles of the parts where sulfur may get on, that is, the wall plate, the partition plate, the casing, and the outlet plate, are set according to the angle of repose of sulfur. is 35~
Since it is considered to be 45°, it is preferable that all angles be 45° or more. In particular, in the embodiment, α=β=45° and γ=60°. The size of the drop opening 21 was 400 x 150 mm, and the spray nozzles were arranged at a distance of 150 mm from the cutting board and at a pitch of 110 mm. A preferred spray nozzle is manufactured by Arakura Kogyo.
It was TYPE 1/2E x 225, material SUS304, wide-angle circular full-surface injection 1/2B. This nozzle has very low static electricity generation due to steam jetting (maximum 400V at source pressure 6Kg/cm ² G).
Kg/cm ² G (60,000 V or more), it is superior in terms of safety, and wide-angle injection of steam is also possible.

The apparatus is also provided with means for returning sulfur not received by the first blocking plate 16 to the shipping port 14. A rubber plate 52 is disposed between the partition plate 38 and the casing 12 and has one end fixed to the partition plate 38 and the other free end abutting against the inner wall of the casing 12.
is provided. Sulfur M that is not received by the first barrier plate 16 is collected and accumulated on the rubber plate 52 by the partition plate 38 or the inner wall of the casing 12. When the accumulated sulfur M reaches a predetermined amount, the rubber plate flexes, the contact between the rubber plate 52 and the inner wall of the casing 12 is broken, a gap is created between them, and the accumulated sulfur M is removed through the gap. is casing 1
2 along the inner wall of the casing 12 in the passage formed by the inner wall of the casing 12 and the third barrier plate and onto the outlet plates 34 and 36.

The sulfur discharged from the outlet plates 34 and 36 to the shipping port 14 falls onto the loading platform T of a truck located below the shipping port 14 and is received therein.

Further, an inert gas, such as _N2 gas, is flowed into the casing 12 to prevent explosion of dust.

Next, the operation mode of the flaky sulfur dust generation prevention device will be explained.

The flaky sulfur M transported by the transport device 1 goes around the discharge end pulley 3 and is dropped onto the first barrier plate 16. Sulfur M is the first jiyama board 1
6, the width is restricted to 400 mm by the guide plate 20, and it falls from the drop opening 21 onto the second barrier plate 30. The sulfur M on the second barrier board 30 slides down on the second barrier board and falls onto the third barrier board 32. The third stop plate 32 is the exit plate 3 for sulfur M.
4,36, and the sulfur M is guided to the exit plate 34,3.
6, is discharged to the shipping port 14, and then falls onto the loading platform T of the truck. When the sulfur M slides down as described above, the spray nozzles 44, 46 and 48 provided in the first chamber 40 and the second chamber 42,
Steam is injected through 50. Therefore, most or all of the sulfur M that slides down is in the first chamber 4.
Humidification is performed by steam in the 0 and 2nd chambers 42, and dust is completely prevented from flying up inside the room or even when it is released from the room to the outside. In addition, since the steam is lighter than the air inside the casing and the _N2 gas that has flowed into the casing 12, the first and second chambers are filled without staying near the shipping port 14, so that even if there is a small amount of dust in the chamber, the steam Even if sulfur powder is generated, the dust comes into contact with steam, becomes heavy in apparent weight, falls and mixes with sulfur powder, and does not remain suspended for a long time. There is a concern that steam may escape from the upper fall port 21 and the lower outlet 14, but in reality, both ports are substantially blocked by the continuously moving sulfur M, and very little steam escapes. Therefore, a large amount of steam escapes to the outside of the first and second chambers, and does not come into contact with rotating parts or other parts and adversely affect these parts. In addition, the first and second chambers 40 within the casing 12 are particularly likely to generate substantially the largest amount of dust.
Also, the amount of N ₂ gas that has flowed into 42 and escaping to the outside is extremely reduced, and therefore the amount of N ₂ gas supplied can be significantly reduced.

The steam used in this device is preferably about
The pressure is in the range of 0.2 Kg/cm ² G to about 3 Kg/cm ² G, more preferably the range of about 0.3 Kg/cm ² G to about 1 Kg/cm ² G, and the temperature is about 130° C. to about 150° C. ℃ range. In addition, steam has a sulfur content of approximately 100 tons/hr.
It is preferred to inject at a rate of 100 Kg/hr to about 150 Kg/hr.

That is, heated steam having a pressure of about 0.2 Kg/cm ² G to about 3 Kg/cm ² G and a temperature of about 130° C. to about 150° C. is used, and the heated steam is heated to form flaky sulfur.
By injecting at a rate of about 100 Kg/hr to about 150 Kg/hr for 100 ton/hr, it was possible to effectively prevent the generation of dust without increasing the moisture content of the flaky sulfur.

On the other hand, when the heating steam temperature is about 130℃ or less, the moisture content of flaky sulfur is 0.1wt.
%, and when heated steam of about 150° C. or higher was used, the quality of the flake sulfur product deteriorated and the effect of preventing dust generation was not sufficiently achieved.

In addition, when using heated steam at a pressure of 0.1 Kg/cm ² G and a temperature of 140°C, and injecting the heated steam at a rate of about 150 Kg/hr or more to 100 tons/hr of flaky sulfur, the water content of sulfur is It was 0.1wt%, and no favorable results were obtained. Furthermore, when heated steam under the same conditions was injected at a rate of about 100 Kg/hr or less, the dust generation prevention effect was not sufficient, and dust generation was observed to the extent that it was a hindrance to the work.

Referring to FIG. 4, there is shown an embodiment of the flaky sulfur dust generation prevention device according to the present invention, which is an improvement on the flaky sulfur dust generation prevention device of FIGS. 1 to 3. The flaky sulfur dust generation prevention device 10' has the same basic structure as the flaky sulfur dust generation prevention device 10 shown in FIG. The only difference is that two rubber partition plates 60 and 62 are used. The partition rubber plates 60 and 62 are attached to the casing 1 by mounting angles 64 and 66.
One end is attached to 2, and the other free end is attached to sulfur M
are configured so that they collide with each other when they are not transported by the transport device 1. When the sulfur M is conveyed, the tips of the partition rubber plates 60 and 62 are bent due to the weight of the sulfur M, and the tips of the two plates are separated from each other, and the sulfur falls into the second barrier plate 30 through the gap.
The operating mode thereafter is the same as that of the flake-like sulfur dust generation prevention device 10 described above. It is understood that the flaky sulfur dust generation prevention device 10' according to the present invention has two rubber partition plates at the inlet and outlet of the sulfur M, and therefore has an excellent effect of trapping steam indoors. There will be.

The results of various tests conducted using the apparatus according to the present invention were as follows.

(1) Dust generation prevention effect Very good. When steam was not being injected, it was impossible to approach the truck without wearing dust-proof goggles, but once steam was started, the dust production stopped within a few seconds.

(2) Moisture content of sulfur The moisture content of sulfur does not change even when steam is injected.
Even without injection, the concentration remained unchanged at 0.025wt%.
This value does not pose any problem as a product.

(3) Effect of static electricity caused by steam When we measured the static electricity of sulfur falling from the shipping port, it showed a value of 60KV or more when no steam was injected, and 40KV when steam was injected, indicating that the electrostatic potential of sulfur had decreased. Ivy.

The flaky sulfur dust generation prevention device according to the present invention configured as described above can prevent the generation of dust without substantially changing the moisture content of the material to be conveyed, and can also prevent the generation of dust by injecting heated steam. is in the direction of lowering the O ₂ % in the casing,
Increased relative humidity makes it easier for static electricity to leak,
All of these have an extremely excellent effect of preventing dust from exploding. Furthermore, the device according to the present invention has the advantage of having a simple structure, low manufacturing cost, and low operating cost.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a device for preventing generation of flaky sulfur dust, which forms the basis of the present invention. FIG. 2 is a longitudinal cross-sectional view of the flaky sulfur dust generation prevention device shown in FIG. 1. FIG. 3 is a schematic side view of the flaky sulfur dust generation prevention device taken along the line - in FIG. 1. FIG. 4 is a schematic vertical sectional view of an embodiment of a flake-like sulfur dust generation prevention device embodying the present invention. 1: Conveyor device, 2: Conveyor belt, 3: Pulley, 10': Flaky sulfur dust generation prevention device,
12: casing, 14: shipping port, 16: first wall board, 18, 20: guide board, 22, 24: rubber plate, 30: second wall board, 32: third wall board,
34, 36: Exit plate, 38: Partition plate, 40: First
Chamber, 42: Second chamber, 44, 46, 48, 50: Spray nozzle, 60, 62: Partition rubber plate.

Claims (1)

[Scope of Claims] 1. A casing provided with an inlet through which flaky sulfur is introduced and an outlet through which the flaky sulfur is sent out; For receiving the casing, the respective lower free ends are arranged opposite each other in a downwardly converging manner, and the respective lower free ends resiliently abut each other in the normal state, and the upper opposite ends respectively a pair of rubber plates attached to the casing; for receiving falling sulfur flakes by pushing apart the abutting free ends of the pair of rubber plates and guiding the sulfur flakes to the outlet of the casing; A sloping board; equipped with a heating steam injection means provided facing the board; the heated steam jetting means applies pressure to the flaky sulfur that has slid down on the board; is approximately 0.2Kg/cm ² G to approximately 3Kg/cm ² G
Inject heated steam with a temperature in the range of about 130 ° C to about 150 ° C at a rate of about 100 Kg / hr to about 150 Kg / hr to 100 tons / hr of flaky sulfur,
A flaky sulfur dust generation prevention device characterized by preventing the generation of dust. 2. The flaky sulfur dust generation prevention device according to claim 1, wherein the diagonal plate is attached to the casing at an angle of repose greater than or equal to the angle of repose of the flaky sulfur material. 3. The flake-like sulfur dust generation prevention device according to claim 1, wherein the diagonal plate is attached to the casing at an angle of 45 degrees or more with respect to the horizontal. 4. The outlet of said casing is provided with a pair of opposing and downwardly inclined rubber plates, each rubber plate having one end thereof attached to said casing, and the free edges of the other ends resiliently touching each other under normal conditions. The flaky sulfur dust generation prevention device according to claim 1 or 2, which is configured to meet the above conditions.