JPS6116272Y2 - - 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 materials would fall and fall onto the loading platform. 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 by a blower, separated and collected using a back filter, etc., and is mainly used to prevent the generation of flaky sulfur dust by using sealed conveyor belts, 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, 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 the installation of a suction duct, blower, back filter, etc., resulting in extremely high installation costs and the need for dust collection work, which poses problems such as extremely complicated operation. 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 the production, storage, and shipping facilities of flaky sulfur, and to prevent this, it is necessary to blow inert gas and control the content to below the explosion limit of O ₂ %. 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 present applicant aims to prevent the generation of dust by bringing steam into contact with dust generated in production, storage, and shipping equipment of dust-generating substances. We proposed a method and device for
No.), the present invention relates to an improvement of said device.

Dust-generating substances, such as flaky sulfur, have various particle sizes, and large and small lumps are mixed during transportation. Particularly large lumps can then become clogged or clogged within the device, rendering the device inoperable. This is extremely unfavorable for work, necessitates disassembly and repair of the device, and causes great economic damage.

Therefore, the purpose of the present invention is to provide a highly reliable dust generation prevention device that pre-separates only large lumps from dust-generating substances, prevents clogging in the device, and enables smooth continuous operation. It is something to do.

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 objectives are to sort the dust-generating substances from the production, storage and shipping equipment, for example by means of a conveyor, through a filter according to their particle size, and to pass through the filter. This is achieved by injecting the material with steam.
When the material is flake sulfur, the sulfur and steam are brought into contact, and according to the method, blowing the steam into a given facility increases the temperature within the facility and also increases the O ₂ % within the facility. , thereby suppressing the generation of dust itself,
It also serves to eliminate the possibility of dust explosions. 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.

Referring to FIG. 1, the present invention is embodied in a shipping facility for shipping dust-generating substances, such as flake sulfur M, to a truck loading platform T using a conventional belt conveyor conveying device 1. That will be understood. The belt conveyor conveyance device 1 has a dust generation prevention device 10 according to the present invention at its sulfur discharge end, that is, at the right end where the pulley P is provided.
is provided and is integrally or removably connected to the frame of the transport device 1.

Casing 1 of dust generation prevention device 10 according to the present invention illustrated in a form that includes conveyor device 1
2 is divided by a partition wall 13 into a dust generation prevention chamber A and a large lump storage chamber B. A filter means 14 is provided at a position suitable for the entrance E of the dust generation prevention chamber A, that is, the sulfur discharge end of the conveying device 1. At this time, the filter means 14 operates in the dust generation prevention chamber A so as to guide the large lump dust-generating material M ₀ that has not passed through the mesh of the filter means into the large lump material storage chamber B.
It is preferable that the filter means 14 be arranged to be inclined downwardly from the filter means 14 to the large lump storage chamber B, and that one end 14' of the filter means 14 partially protrudes into the storage chamber B.

A bottom cover 15 which can be opened and closed is pivotally attached to the lower end of the large lump storage chamber B by means of attachment means 16, and is configured so that the large lump M ₀ can be taken out into the storage chamber B at an appropriate time. be done.

On the other hand, the small-diameter dust-generating substance M ₁ that has passed through the filter means 14 falls onto a downwardly inclined first baffle plate 18 disposed below the filter means 14 . It will be done. The sulfur M ₁ that has fallen onto the first barrier board 18 is placed in a direction opposite to the slope of the first barrier board 18 so as to receive the sulfur M ₁ that has slipped down from the first barrier board 18 . It reaches onto the second jamb board 20 which is inclined in the direction. Further, a third barrier plate 22 is provided which is inclined in the opposite direction to the second barrier plate 20 to receive the sulfur M ₁ from the second barrier plate 20. The above sulfur M ₁ is sent to the shipping port 24 of the dust generation prevention chamber A of the casing 12. Sulfur M ₁ released from the third board 22 to the shipping port 24
is the exit plate 2 provided between the third barrier plate 22 and the shipping port 24 before being discharged from the shipping port 24.
6 and 28. Exit plate 26
and 28 are preferably rubber plates which abut each other and are held closed when no sulfur is on the outlet plates, but when sulfur is dropped onto the outlet plates 26 and 28. , the rubber plate is bent by the weight of the sulfur, causing the sulfur to fall into the shipping port 24.

Further, spray nozzles 30, 31; 32; and 33;
8, 20, and 22 facing each other. Any size, shape, and number of spray nozzles can be used as desired, and the arrangement thereof can be varied in various ways. In the embodiment shown in FIG. 1, steam can be injected onto the dust-generating material by the spray nozzle 35 even during the process from the third barrier plate 22 to the shipping port 24 along the inclined wall 12' of the casing 12. It is said that

Furthermore, if we specifically explain the above structure,
First, second and third jamb boards 18, 20 and 2
2 is preferably a stainless steel plate (e.g.
SUS304), and the angle α of the parts where sulfur may get on, that is, the board and the casing, is all 45° or more because the angle of repose of sulfur is considered to be 35 to 45°. It is preferable to do so. Such angle is not critical and may vary depending on the type of material being handled. The spray nozzle is 150mm away from the cutting board and 110mm away.
They were arranged at a pitch interval of . The preferred spray nozzle is TYPE1/2E x 225 made by Arakura Kogyo, and the material is
It was SUS304, 1/2B with wide-angle circular all-over injection. This nozzle generates very low static electricity due to steam jetting (maximum 400V at a source pressure of 6Kg/cm ² G), and 60,000V in the case of a drilled hole (3 mmφ hole, source pressure 6Kg/cm ² G).
It is superior in terms of safety compared to the above), and wide-angle injection of steam is also possible.

On the other hand, the sulfur discharged from the outlet plates 26 and 28 to the shipping port 24 falls onto the loading platform T of the truck located below the shipping port 14 and is received therein.

Additionally, an inert gas, such as _N2 gas, is introduced into the casing 12 by suitable means (not shown) to prevent dust explosions.

Next, the operating mode of the present invention will be explained.

As will be understood from the above description, the flaky sulfur M conveyed by the conveying device 1 goes around the delivery end pulley P and falls onto the filter means 14. The large lumps M ₀ in the sulfur M are guided into the storage chamber B and slide down, while only the small particle size sulfur M ₁ passes through the filter means 14 and falls onto the first baffle plate 18 . Sulfur M ₁ slides down on the first barrier board 18 and falls onto the second barrier board 20.
The sulfur M ₁ on the second barrier board 20 slides down on the second barrier board and falls onto the third barrier board 22. The second barrier plate 22 guides the sulfur M ₁ to outlet plates 26, 28, through which the sulfur M ₁ is discharged to the shipping port 24 and then to the truck bed T. Fall. When the sulfur _M1 slides down as described above, steam is injected onto the dust-generating substance through the spray nozzles 30-35. Therefore, most or all of the sulfur _M1 that slides down is humidified by steam in the dust generation prevention chamber A, and dust is completely prevented from rising inside the room or even when it is released from the room to the outside. Ru. In addition, steam is lighter than air and _N2 gas, so it fills the room. Therefore, even if a small amount of dust is generated in the room, the dust comes into contact with the steam, becomes heavier in apparent weight, and falls and becomes sulfur powder. They mix and do not remain suspended for long. There is a concern that steam will escape from the upper fall port E and the lower outlet 24, but in reality both ports are substantially blocked by the continuously moving sulfur M, and the escape of steam is extremely small. Therefore, a large amount of steam escapes outside the room and does not come into contact with rotating parts or other parts and adversely affect these parts.
In addition, the amount of N ₂ gas that has flowed into the dust generation prevention chamber B in the casing 12, where there is a concern that the generation of substantially oversized dust, is also extremely reduced, and the amount of N ₂ gas that escapes to the outside is extremely reduced. supply can be significantly reduced.

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℃. Further, it is preferable that the steam be injected at a rate of about 100 Kg/cm ² to about 150 Kg/cm ² per 100 tons/hr of sulfur.

Referring to FIG. 2, another embodiment of the dust generation prevention device according to the present invention is illustrated. This embodiment is similar to the first one, except that rubber inlet partition plates 40 and 42 are provided between the conveying device 1 and the casing 12, that is, at the inlet of the casing 12.
This is the same as the embodiment illustrated in the figures. The rubber partition plates 40 and 42 are normally held closed with their tips abutting each other, but when sulfur is dropped from the conveying device 1 onto the partition plates 40 and 42, the sulfur The rubber partition plate bends due to the weight,
The sulfur is arranged to be discharged into filter means 14 as shown. The rubber plate partition plate 40
and 42, the dust is completely confined within the casing 12 and treated.

As described above, the dust generation prevention device according to the present invention configured as illustrated in FIGS. The increase in _relative humidity makes it easier for static electricity to leak, and both of these have the extremely excellent effect of acting in the direction of preventing dust explosions. Furthermore, it has the effect of completely avoiding a situation where large-diameter, so-called large-sized dust generating substances enter the dust generation prevention chamber and become clogged between the jambs, making it impossible to operate the dust generation prevention device. has.

In the above description, the present invention has been described as being applied to a device that conveys flaky sulfur using a belt conveyor, but the present invention is not limited to these embodiments, and can be applied to a device that conveys flaky sulfur using a device other than a belt conveyor. It will be appreciated that other materials other than sulfur can also be used.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a dust generation prevention device according to the present invention. FIG. 2 is a schematic sectional view of another embodiment of the dust generation prevention device according to the present invention. 10: Prevention of dust generation, 12: Casing, 1
4: Filter means, 18, 20, 22: Yama board, 24: Shipping port, 26, 28: Outlet rubber plate, 4
0,42: Entrance partition plate, A: Prevention of dust generation, B:
Large lump storage chamber, E: Dust generation prevention chamber entrance.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A dust generation prevention chamber having an inlet for carrying in materials and an outlet for sending out the materials, and a large lump material storage chamber provided adjacent to the dust generation prevention chamber. A casing provided at the entrance of the dust generation prevention chamber, for guiding large lumps of material to the large lump material storage chamber and allowing only other small diameter materials to pass through to the dust generation prevention chamber. Filter means; a first barrier plate provided in the dust generation prevention chamber adjacent to the filter means and inclined in a first inclination direction to receive the material that has passed through the filter means; A second wall plate inclined in a second inclination direction opposite to the first direction of inclination to receive material that has slid down on the second wall plate; a third wall plate inclined in the first inclined direction and extending near the outlet in order to receive the material and guide the material to the outlet of the dust generation prevention chamber; and each of the respective wall boards. A dust generation prevention device characterized by comprising a steam injection means provided facing the. 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 the first, second and third bending plates are attached to the dust generation prevention chamber at an angle of repose greater than or equal to the angle of repose of the material. 4. The dust generation prevention device according to claim 1, wherein each of the two steam injection means is a wide-angle circular all-over injection type spray nozzle. 5. 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 configured so as to match the above. 6. The dust generation prevention device according to claim 1 of the utility model registration claim, wherein the material is flaky sulfur. 7 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. 8. The dust generation prevention device according to claim 7, wherein the steam has a pressure in the range of about 0.3 Kg/cm ² G to about 1 Kg/cm ² G. 9. The dust generation prevention device according to claim 8, wherein the steam is injected at a rate of about 100 Kg/m ² to about 150 Kg/cm ² to 100 tons/nr of flaky sulfur. 10 The inlet 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 configured so as to match the above.