JP2668628B2 - How to transport granulated carbon black - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to granulated carbon black (carbon black beads) in the form of agglomerated particles.
The present invention relates to a method of transporting without substantially crushing .

[0002]

2. Description of the Related Art Carbon black is used in large quantities in the rubber industry, etc., but in order to convey a large amount of carbon black from a producer (delivery side) to a user (delivery side), a non-pressurized bulk truck is mainly used. (Railroads, trucks,..., Lorries). Then, on the carry-in side, it is sent from the truck to the silo by air transportation or a bucket conveyor.

At this time, the produced carbon black has very small particles (100 μm or less), is liable to float, is easily attached, is liable to be fluidized by containing a gas (jet), and forms a bridge in the storage tank. It is easy to handle or difficult to handle because it is difficult to knead with other materials, so it is handled in the form of granulated carbon black that is agglomerated into particles. Therefore, it is necessary to prevent the granulated carbon black from destroying the granulated state during transportation.

However, in the conventional carrying method, there was a problem particularly on the carrying-in side, and the crushing rate of the granulated carbon black could not be lowered to allow smooth transportation. That is, in pneumatic transportation, on the carry-in side, as shown in FIG. 2, once it is housed in the closed-type blow tank 3 via the granulated carbon black valve 2 from the truck, the valve 2 is closed, and then from the air supply device 4. The air and pressure are sent up to the silo 6 all at once through the transportation pipe 5 and stored therein. The air and pressure at that time are 1 to 6 kg / cm ² in pressure, 15 to 20 m / sec in wind speed in the pipeline, The mixing ratio is 10 to 100 particles weight / air weight, and the wind speed is too high for conveying the granulated carbon black. For this reason, there is a lot of contact between the granulated carbon black and the contact with the pipe wall sent in the transportation pipe, and the impact at that time is large, so that the crushing rate is high (a 150 μm mesh screen). 20% abnormal below).

[0005] The strength of the granulated carbon black, expressed as the limit weight that can be crushed when the particles are multiplied by the weight, is very easily crushed at 4 to 20 g.
When other conditions such as the mixing ratio are the same, the crushing rate is almost proportional to the cube of the wind speed. On the other hand, the fine powder generated by crushing is easy to float as described above, easy to be jetted, and other than handling problems, it easily adheres to the pipe wall, and cakes and plugs are generated, which hinders smooth transport of granulated carbon black. Will be a factor. In FIG. 2, reference numeral 7 denotes a dust collector, which is constituted by a bag filter for removing used carrier air and preventing dust.

[0006] In addition to pneumatic transportation, in order to improve the above-mentioned difficulties caused by gas transportation, it is necessary to make the inner wall of the transportation pipe 5 as smooth as possible and to reduce the supply air velocity.
This cannot be achieved in terms of wind speed with the method according to FIG. As shown in FIG. 3, by providing the auxiliary air supply device 21 in the transportation pipe 5, it is possible to suppress the wind speed for transportation, but still the transportation of the granulated carbon black to the transportation pipe 5 is possible. Since the feed is controlled by the capacity of the blow tank 3, the movement of the granulated carbon black fed into the silo 6 is intermittent, and does not contribute to the conveyance such as the supply of the granulated carbon black to the blow tank 3 and the operation of the valve. Dead time is generated, and the transportation efficiency is reduced by about 30 to 40%.

Further, a device such as the valve 2 and the blow tank 3 is required, and the lorry 1 is guided to a high place in order to supply the granulated carbon black to the blow tank 3 by natural fall from the lorry 1. Equipment such as an underground pit for lowering the blow tank 3 with respect to the slope truck or the lorry is required, which increases the installation cost on the loading side.

[0008] In the gas transportation method, as shown in Fig. 4, the granulated carbon black is first placed in a hopper 8, and from there a rotary feeder 9 is used to transport the transportation pipe 5 under pressure.
It is supplied inside. The carrier air in this case has a pressure of 0.1 to 0.6 kg / cm ² and a wind velocity of 20 to 35 m / in the pipe.
sec, mixing ratio is 1 to 10 particle weight / air weight. This method has simple equipment and low installation cost, and relatively few plugs and cakes are generated inside the transport pipe 5,
The wind speed of the carrier gas is large, and the degree to which the granulated carbon black is destroyed is very high. In FIG. 4, a large-sized transbag 11 and a paper bag 10 are shown in order to show an example of another transporting means from the unloading side.

In the case of a bucket conveyor, the granulated carbon black discharged from the lorry 1 as shown in FIG.
First, it is dropped into the hopper 8 by gravity, and then it is sent to the bottom of the bucket conveyor 12 by the rotary feeder 9 and then sent to the top of the silo 6 by the bucket 13 and put into the silo 6. Reference numeral 30 denotes an exhaust fan that keeps the inside of the silo 6 at a negative pressure to prevent dust from leaking.

This method has a relatively low installation cost.
However, it still requires an underground pit, and the moving parts are mainly formed when the granulated carbon black is put into the hopper 8, when the rotary feeder 9 sends it to the bucket conveyor 12, and when the bucket 13 is picked up. Contact with granular carbon black and violently destroy the granulated state. Further, the maintenance cost is very large, such as prevention of deterioration of the working environment due to leakage of fine powder from the bucket conveyor 12 and monitoring of the growth of the bucket chain.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method capable of efficiently transporting granulated carbon black without breaking the granulated carbon black in transporting the carbon black by gas, and having a small installation cost. . The carrier gas is mainly air, but other than air such as nitrogen gas may be used.

[0012]

In the conveyance path of the granulated carbon black, the discharge side and the load side are connected by a pressurized bulk lorry vehicle. On the loading side, a silo, a transport pipe having a tip connected to the silo and a gas carrier, and an air supply device are provided.

At least the bent portion of the transportation pipe is provided with an auxiliary air supply device which operates by differential pressure with respect to the pressure inside the transportation pipe and ejects air into the transportation pipe. The granulated carbon black is put into the tank of the lorry vehicle from the carry-out side and conveyed to the carry-in side. The base end of the transportation pipe is directly connected to the tank outlet of the truck on the loading side.

The inside of the lorry vehicle is pressurized by the air supply device and at the same time air is supplied to the transportation piping. Thereby, the granulated carbon black in the tank is fed into the transport pipe. The granulated carbon black is fed into the silo at a low speed while preventing the stagnation of the granulated carbon black in the transportation pipe caused by keeping the wind speed low with an auxiliary air supply device.

[0015]

[Operation] On the loading side, the structure in which the base end of the transportation pipe is directly connected to the tank discharge port of the lorry vehicle does not require an underground pit or slope for transferring the granulated carbon black from the lorry vehicle to the loading side. To do. The configuration in which a pressurized type is used as a lorry vehicle and the inside of the tank is pressurized by an air supply device on the loading side makes the conventional blow tank unnecessary, and
It enables the carbon black in the tank to be continuously fed into the silo. The auxiliary air supply device provided at least at the bent portion of the transportation pipe prevents the granulated carbon black from stagnating in the transportation pipe, and thereby enables the transportation at a low speed.

[0016]

FIG. 1 schematically shows the method for conveying granulated carbon black of the present invention, and shows the discharge side 1 of the granulated carbon black.
A pressurized bulk lorry 31 is disposed between the feeder 4 and the loading side 15 to form a transfer path.

A pressurizing type bulk lorry vehicle 31 (hereinafter referred to as a lorry vehicle) is of a type as described in, for example, Japanese Utility Model Publication No. 52-7670, and has a fluidization mechanism and an internal pressurization inside the tank 16 by supplying air. Equipped with a mechanism. Therefore, the granulated carbon black loaded in the tank 16 can be fluidized in a floating state (aeration) in the tank 16 as needed, and can be completely pumped out of the tank 16. If the fluidization is insufficient, the tank 16 can be inclined to promote the discharge of the granulated carbon black from the tank 16. In the embodiment, the loading capacity of the lorry vehicle 1 is 10 t.

The discharge side 14 is provided with a discharge side silo 17 containing the produced granulated carbon black and a delivery pipe 18. The loading side 15 includes a loading silo 6,
A transport pipe 5 and an air supply device 4 having one end connected to the silo 6 are provided.

The transport pipe 5 is a stainless steel pipe (φ = 210 in this example), and its tip is connected to the top of the loading silo 6 and communicates with the inside of the loading silo 6. At the base end, the granulated carbon black discharge port 1 of the lorry wheel 31
A coupling 20 connected to 9 is mounted. An auxiliary air supply device 21 is provided at least at the bent portion. The inner surface of the pipe made of stainless steel is buffed to be smooth (about # 400) so that fine powder (carbon black) does not easily adhere to the pipe. The pipe may be a rubber pipe. In this case, the pipe has flexibility and can easily peel off the attached carbon black due to expansion and contraction or vibration, and the amount of carbon black attached is small.

The auxiliary air supply device 21 is disclosed in Japanese Examined Patent Publication No. 54-615.
No. 3 is provided and comprises an auxiliary air supply passage 22 juxtaposed to the transport pipe 5, a plurality of differential pressure actuating valves 23 provided therebetween, and a nozzle 24 opened in the transport pipe 5. The valve 23 is not opened when, for example, the pressure in the transport pipe 5 and the pressure in the auxiliary air supply passage 22 are equal,
When the granulated carbon black tends to stagnate for some reason and the pressure drops, the valve 23 at that point opens to supply air from the auxiliary air supply passage 22 into the transport pipe 5 through the nozzle 24. To do.

As a result, the granulated carbon black, which tends to stay in the transport pipe 5, regains its free flowing state, and moves smoothly in the pipe without causing plugs even at low wind speeds. To go. That is, the auxiliary air supply device 21 is an auxiliary fluidization device for the granulated carbon black that operates differentially in relation to the pressure inside the transportation pipe 5 and supplies air into the transportation pipe at a point where the pressure drops.

The air supply device 4 is a normal device comprising an air compressor, an accumulator, a filter, and various control valves. The tank air supply passage 26 connected to the air supply port 25 in the tank 16 of the lorry 31 and the transportation pipes. 5 and the auxiliary air supply passage 22 which is a part of the auxiliary air supply device 21. The tip of the tank air supply passage 26 has a coupling 28 connected to the air supply port 25.

Further, the silos 6 on the delivery side are of a collective type in this embodiment, and a dust collector 7 having a bag filter is disposed above each silo 6. Sign 2
A branch valve 9 is arranged in the transportation pipe 5.

About 10 tons of the granulated carbon black produced is transported from the unloading-side silo 17 on the transporting side 14 to the tank 16 of the lorry vehicle 31 through the transporting pipe 18 for delivery.
Is stored in. The stored granulated carbon black travels along the transportation route by the lorry wheel 31 and reaches the loading side 15.

On the carry-in side 15, the base end of the carry-in side transport pipe 5 is connected to the discharge port 19 provided in the tank 16 of the lorry 31 via the coupling 20, and the air supply port 25 is provided with an air supply device. The four tank air supply paths 26 are connected via a coupling 28. The granulated carbon black loaded by the aeration by the air supplied into the tank 16 is fluidized and, at the same time, is sent out from the discharge port 19 to the transport pipe 5 by the pressure in the tank 16.

Next, the granulated carbon black moves in the transport pipe 5 by the carrier air while being kept in a flowing state, and is sent into the carry-in side silo 6. In this case, the air supply device 4
In consideration of the relationship between the total air supply amount and the inner diameter of the transport pipe 5, the pressure inside the transport pipe is 0.5 to 1.9 kg / cm ² and the wind speed (end ) Amount of air supply so that it can be transported at a low speed of 4-8 m / sec
The pressure is adjusted (set).

The granulated carbon black (1
0t) is continuously sent out and stored in the silo 6.
During this time, even if the granulated carbon black tends to stagnate in the transport pipe 5 due to the low-speed transport, the auxiliary air supply device 21
The fluidized state is maintained by and is smoothly conveyed to the silo 6 without being blocked.

The transportation capacity of the transportation based on the above numerical values is 10 to 10.
It was 20 tons / hour (inner diameter of transport pipe = 210 mm), and the crushing rate of the granulated carbon black was 3% under a sieve having a 150 μm opening. This crushing rate is practically almost no crushing. The range of the above numerical values depends on the layout of the transport pipe 5 and the size of the silo 6. In addition, the crushing rate of the granulated carbon black is practically allowable at a low speed of 8 m / s or less in the transport wind speed.

As described above, the transported granulated carbon black does not require an underground pit or a slope because the transport pipe 5 is directly connected to the tank 16 on the loading side 15. Further, since the granulated carbon black inside is pumped by connecting the tank air supply passage 26 to the tank 16, a separate blow tank for pressurization is not required. Therefore, the equipment is very simple and maintenance is easy.

Since the granulated carbon black is conveyed at a low speed inside the transport pipe on the loading side, the crushing rate in the granulated state is low.
Moreover, despite the low-speed transportation, the loading amount of the tank 16 can be continuously transferred to the silo 6 without forming plugs or deposits on the transportation pipe 5.

The above is an embodiment, and the present invention is not limited to the illustrated specific configuration. Transport piping 5 on loading side 15
May be polyethylene or PVc, and may employ electrolytic polishing for finishing the inner surface of the metal tube. Further, a vibrator may be attached to the wall surface in order to prevent the fine powder from adhering to the tube wall to form a cake or to prevent the formation of the plug by another method. Auxiliary air supply device 21
May be provided at a position other than the bent portion of the transport pipe 5.

[0032]

According to the present invention, the installation cost on the loading side can be reduced in the transportation path of the granulated carbon black. Low crushing rate of granulated carbon black by transportation. On the loading side, a large amount of granulated carbon black can be continuously transported. Less waste of carrier gas consumption.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a transport path.

FIG. 2 is a diagram showing a transport facility on the loading side (conventional 1)

FIG. 3 is a diagram showing a transport facility on the loading side (conventional 2)

FIG. 4 is a diagram showing a transport facility on the loading side (conventional 3).

FIG. 5 is a diagram showing a transportation facility on a loading side (conventional 4).

[Explanation of symbols]

 1 Non-pressurized bulk lorry vehicle 2 Valve 3 Closed blow tank 4 Air supply device 5 Transportation pipe 6 Silo on the loading side 7 Dust collector 8 Hopper 9 Rotary feeder 10 Paper bag 11 Transbag 12 Bucket conveyor 13 Bucket 14 Unloading side 15 Loading Side 16 Tank 17 Delivery side silo 18 Delivery pipe 19 Discharge port 20 Coupling (transportation pipe) 21 Auxiliary air supply device 22 Auxiliary air supply passage 23 Differential pressure actuating valve 24 Nozzle 25 Air supply port 26 Tank air supply passage 27 Transport supply Airway 28 Coupling (tank air supply path) 29 Branch valve 30 Air blower 31 Pressurized bulk truck

Continuation of the front page (56) References JP 63-82223 (JP, A) JP 52-141982 (JP, A) JP 54-6153 (JP, B2) JP 52-7670 (JP) , Y2)

Claims (1)

(57) [Claims] In the conveyance path of the granulated carbon black, an unloading side and an inflow side are provided with a fluidizing mechanism by air supply and an internal processing.
It is connected by a pressurized bulk lorry equipped with a pressure mechanism inside, and on the loading side, a silo, a transport pipe with a gas connected to the tip of the silo, and an intake device are provided,
The transportation pipe is equipped with an auxiliary air supply device that operates differentially with respect to the pressure inside the transportation pipe to eject gas into the transportation pipe at least in the bent portion, and the granulated carbon black is stored in the tank of the truck on the carrying-out side. Conveyed to the loading side, the base end of the transport pipe is directly connected to the tank discharge port of the lorry truck on the loading side, and the inside of the tank of the lorry truck is pressurized by an air supply device and the granulated carbon black flows.
While transporting the carrier gas to the transport pipe while feeding the granulated carbon black in the tank to the transport pipe, the auxiliary air supply device prevents the stagnation of the granulated carbon black in the transport pipe at a low speed. The method of transporting granulated carbon black, wherein the granulated carbon black is stored in the silo.