JPH0797048A - Pipe transporting method for dehydrated cake or the like - Google Patents

Abstract

PURPOSE:To provide a pipe transporting method, by which a lubricant effect is maintained and long distance transportation is possible, for dehydrated cake or the like. CONSTITUTION:When a material M to be conveyed such as a dehydrated cake is pressure-fed through a pipe 40, a high density conveying material, into which a part of the material M to be conveyed is separately mixed and kneaded for densification, is filled in a layered-shape in the outer circumferential part of the material M to be conveyed from an injecting device 20, and consequently, the material M to be conveyed is covered with a densified layer. A lubricant is injected between the densified layer and the inner circumferential wall of the pipe 40 from a lubricant injecting device KT for carrying out pressure- feeding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehydrated cake or the like in which a lubricant is injected between an inner peripheral wall of the pipe and an outer peripheral portion of the conveyed product when a conveyed product such as a dehydrated cake is conveyed by a pipe. It relates to a pipe transportation method.

[0002]

2. Description of the Related Art A pipe transportation method for pressure-feeding a conveyed product such as a dehydrated cake by a pipe is well known, and a pipe transportation device used for carrying out this transportation method is a positive displacement pump such as a piston pump or a screw pump. And a pipeline. Therefore, when the pipeline is laid to the destination and the conveyed product is pressed into the pipe with the positive displacement pump, the conveyed product is pumped to the destination. Since the goods to be transported are pumped in a closed space called a pipe, they have the characteristic that they do not pollute the environment.The area occupied by the pipeline is small compared to the transportation volume, and the transportation route can be changed by simply changing the piping. Since it also has the advantage that it can be changed, it is suitable as a transfer device for transferring sludge to an incinerator. However, long-distance transportation is difficult. For example, sludge generated at a sewage treatment plant is dehydrated by a filter press or the like and then conveyed to an incinerator for incineration treatment. Such sludge is dehydrated until the water content becomes 70% or less. Therefore, it has no fluidity and the frictional resistance with the pipe is very large, so long-distance transportation is difficult. Therefore, there is known a pipe transportation method in which a lubricant, for example, water is injected between the inner peripheral wall of the pipe and the conveyed object to reduce the frictional resistance between the pipe and the long distance transportation with less power. . The applicant of the present invention also proposed a pipe transportation method, which is an improved method of injecting a lubricant, in Japanese Patent Application No. 62-259610.

[0003]

Even for a product which cannot be transported over a long distance by a pipe due to its high consistency and low fluidity,
According to the pipe transportation method of injecting the lubricant as described above, it is possible to transport the material over a long distance to some extent. However, there are problems to be improved. For example, there is a problem that the effect of the lubricant does not last depending on the properties of the conveyed product and long-distance transportation cannot be performed unless the lubricant is frequently injected. Frequent pouring increases the number of pouring points, increases equipment costs, requires a large amount of lubricant, and increases the liquid content of the conveyed product. The reason why the lubricant must be frequently injected will be described in more detail. For example, a conveyed product such as a dehydrated cake is press-fitted into a pipe by a positive displacement pump as described above. However, it is crushed to be supplied to the positive displacement pump and then press-fitted into the pipe. Then, the lubricant is injected between the inner peripheral wall of the pipe and the outer peripheral portion of the conveyed product. However, there is a void in the crushed conveyed product, and the lubricant injected into the inner peripheral wall of the pipe gradually invades into the inner gap, and it is long between the inner peripheral wall of the pipe and the outer peripheral part of the conveyed product. Does not stay. As a result, the effect of the lubricant is not sustained and must be infused frequently. Therefore, an object of the present invention is to provide a method for transporting a pipe such as a dehydrated cake in which the effect of a lubricant is sustained and which can be transported over a long distance.

[0004]

In order to achieve the above object, the present invention provides a lubricant between an outer peripheral portion of a conveyed product and an inner peripheral wall of the pipe when the conveyed product such as a dehydrated cake is pressure-fed by a pipe. In a transportation method of injecting and pumping, it is configured such that the outer peripheral portion of the conveyed product is covered with a lubricant impervious layer, and a lubricant is injected between the outer peripheral portion of the lubricant impervious layer and the inner peripheral wall of the pipe to pump. It According to a second aspect of the present invention, the lubricant hardly permeating layer according to the first aspect is formed by a conveyed product in which a part of the conveyed product is separately kneaded to increase the density. The lubricant hardly permeating layer described above is formed by a conveyed product having a higher density by passing through the narrowed portion whose diameter is successively reduced toward the downstream side.

[0005]

EXAMPLES In carrying out the present invention, the lubricant impervious layer in the vicinity of the inner peripheral wall of the pipe can be made of a material different from the material to be conveyed, or a part of the material to be conveyed, such as clay or oil. It is also possible to apply a mixture of. However, in the following first embodiment, an example in which a part of the conveyed material is sufficiently kneaded to increase the density will be described. A positive displacement pump is applied to the pump used for implementing the present invention. This positive displacement pump P includes the above-mentioned Japanese Patent Application No. 62-25961.
Positive displacement pumps such as piston pumps and screw pumps as described in No. 0 are applied. When a reciprocating pump such as a piston pump is applied, the pressure of the conveyed product pulsates. Therefore, it is necessary to take some measures such as timing for the method of injecting a highly densified material or lubricant, but injecting by the method disclosed in Japanese Patent Application No. 62-259610 mentioned above. You can However, if a pump with small pulsation as described in Japanese Patent Application No. 3-308347 proposed by the present applicant is applied to the positive displacement pump P, it is convenient because there is no problem of such injection. is there. Further, as the lubricant, water, oil, polymer type lubricant and the like as described in Japanese Patent Application No. 62-259610 are applied.

A first embodiment of the pipe transportation device used for implementing the present invention will be described below. FIG. 1 is a schematic diagram showing an outline of a pipe transport device. As shown in FIG. 1, the pipe transport device according to the present embodiment is for adjusting a positive displacement pump P and a transported object. Supply device 1, kneading device 10 for densifying a part of the conveyed material, high-density conveyed material injection device 20 for supplying the densified conveyed material to a pipe, lubricant injection device KT, pipeline 40 And so on. In the pipeline 40, the high-density conveyed material injecting device 20, the lubricant injecting device KT and the like are appropriately interposed. In addition, the discharge port of the positive displacement pump P has a pipeline 4
0 is connected.

The feeder 1 is provided with a funnel-shaped hopper 2 having a relatively large capacity, as is well known in the art. Then, in the hopper 2, a plurality of paddles 3 for crushing the conveyed product M,
, And a spiral screw 3'which is pushed into the feeder 5 are provided. The paddles 3, 3, ... And the screw 3'are fixed to a drive shaft and are rotationally driven by a motor 4. Therefore, when the paddles 3, 3, ... And the screw 3'are driven, and when a small amount of water is added as necessary, the transported material M is crushed and the like, and is provided below the hopper 2. The rotary pump 5 is supplied to the positive displacement pump P.

The kneading device 10 has a funnel-shaped hopper 12 into which a part of a conveyed product is placed, a kneading blade 13 for kneading the conveyed product in the hopper 12, and a motor 1 for driving the kneading blade 13.
4. A screw feeder 15 for injecting the densified conveyed product MM into the high-density conveyed product injecting device 20 is provided. The funnel-shaped hopper 12 is for densifying a part of the conveyed material, and is much smaller than the hopper 2 of the supply device 1, and the kneading amount is also small. Therefore, it is kneaded with a small power. Further, the funnel-shaped hopper 12 is provided with a pipe 1 for supplying an additive such as a polymer solution and water, that is, a binder.
6 is provided. The discharge port of the screw feeder 15 and the high-density conveyed material injection device 20 are connected by a supply pipe 17. The discharge pressure of the screw feeder 15 is slightly higher than the pressure of the conveyed product in the third pipe 43 on the downstream side of the high-density conveyed product injection device 20.

A plurality of the high-density conveyed material injecting devices 20 can be provided at appropriate positions in the pipeline 40 at predetermined intervals as the conveying distance becomes long. At this time, the lubricant injection device K
It is provided on the upstream side of T. However, FIG. 1 shows only an example in which one pipe is provided between the second pipe 42 and the third pipe 43. A specific example of the high-density conveyed material injection device 20 is shown enlarged in FIG. That is, the high-density conveyed material injecting device 20 is roughly configured by an inner pipe 21 located inside and an outer pipe 30 having a large diameter arranged outside the inner pipe 21.

The inner pipe 21 has a tapered portion 22 which is tapered toward the downstream side. A flange 23 is integrally provided on one end of the tapered portion 22, and is attached to the flange 46 of the second pipe 42 by this flange 23. The inner diameter of the flange portion 23 of the inner pipe 21 is substantially the same as the inner diameter of the second pipe 42, but the outer diameter of the downstream open end 24 is smaller than the inner diameter of the downstream third pipe 43. Therefore, the tapered portion 2
Between the outer peripheral wall at the open end 24 of No. 2 and the inner peripheral wall of the third pipe 43, there is an annular slit 25 at a predetermined constant interval. Conveyed object M densified from this annular slit 25
The M will be ejected in an annular shape. The outer tube 30 is the inner tube 2
1 has a length that is substantially the same as that of the inner pipe 21, but has a large diameter, and has a predetermined distance from the tapered portion 22 of the inner pipe 21 and between the outer pipe 30 and the tapered pipe 22. An annular supply space 31 is formed in the. Flanges 32, 32 are integrally provided at both ends of the outer tube 30, and the outer tube 30 is
The supply pipe 17 for sending the highly densified conveyed product MM to the supply space 31 is connected, and a pressure gauge 34 and the like are also provided. Although a plurality of supply pipes 17 can be connected around the outer pipe 30, an example in which one supply pipe 17 is provided is shown in the drawing.

The high-density conveyed material injection device 20 of this embodiment is
Since it is configured as described above, it is possible to align the flange 23 of the inner pipe 21 and the flange 32 of the outer pipe 30 with the flange 46 of the second pipe 42 on the upstream side by the seal fitting and tighten the bolts and nuts. The inner pipe 21 and the outer pipe 30 can be attached to the second pipe 42 on the upstream side. Then, the entire flange can be assembled and attached to the other flange 32 of the outer tube 30 by tightening the flange 47 of the third pipe 43 on the downstream side. The structure and operation of the lubricant injection device KT, the lubricant tank KN, the pressure gauge AT and the like can be implemented as described in the above-mentioned Japanese Patent Application No. 62-259610, and therefore the description thereof will be omitted.

Next, a method of transporting a conveyed product such as dehydrated cake by the above-described pipe transporting device will be described with reference to FIGS. The conveyed product M is put into the hopper 2 of the supply device 1, and the motor 4 is activated to condition the conveyed product M such as crushing. It should be noted that it is sufficient to adjust the quality so that it can be sucked into the positive displacement pump P. The conveyed product M is put into the hopper 12 of the kneading device 10. Then, the motor 14 is started to knead the conveyed product M by the kneading blade 13. At this time, water or the like is added from the pipe 16 and kneaded sufficiently so that voids do not occur in the conveyed product M sucked into the screw feeder 15. As a result, the high-density conveyed product MM is obtained. The positive displacement pump P is activated to press the conveyed product M into the first pipe 41. Then, the second pipe 42, the high-density carrier injection device 20, the third pipe 43, and the lubricant injection device KT are pressure-fed in order. The screw feeder 15 is driven to inject the high-density conveyed product MM from the supply pipe 17 into the supply space 31 of the high-density conveyed product injecting device 20.

In the injection device 20 shown in FIG. 2A, the tapered portion 22 is narrowed toward the downstream side, and a step is formed in the diameter direction between the downstream end 24 of the tapered portion 22 and the third pipe 43. Since there is, the densified goods MM in the supply space 31
Are ejected in an annular shape around the article M from the annular slit 25. That is, the high density conveyed object MM is provided around the conveyed object M.
Covered with a layer of. This state is schematically shown in FIG. In such a state, the lubricant is injected from the lubricant injection device KT on the downstream side as described in Japanese Patent Application No. 62-259610. The injected lubricant is blocked by the high-density conveyed product MM and is prevented from penetrating into the inside of the conveyed product M, so that the outer peripheral portion of the layer of the high-density conveyed product MM and the inner peripheral wall of the pipeline 40 are suppressed during transportation. Stay in between. Therefore, it contributes to the effect of reducing frictional resistance for a long time, and long-distance transportation is possible. As described above, according to the present embodiment, since a high-density conveyed product MM is obtained by kneading a part of the conveyed product M, compared with the case where the entire amount of the conveyed product is kneaded and densified. As a result, the cost of power for kneading becomes easier, and the effect of using a small mixer, for example, for kneading is also obtained.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same members as or similar members to those in the first embodiment described above, which have the same functions, are designated by the same reference numerals and will not be redundantly described. According to the present embodiment, between the second pipe 42 and the third pipe 43 on the downstream side, instead of the high density conveyed material injecting device 20 of the first embodiment, the consolidation joint 5 is used.
0 is installed. As shown in FIG. 4, the compaction joint 50 has an enlarged diameter portion 51 whose diameter is gradually increased toward the downstream side, and a diameter from the enlarged diameter portion 51 to the third pipe 43.
The narrowed portion 52 is tapered to have the same diameter as Flanges 53 and 54 are integrally provided at the upstream end of the expanded diameter portion 51 and the downstream end of the narrowed portion 52.
4, it is attached between the upstream second pipe 42 and the downstream third pipe 43.

The operation of the second embodiment will be described. The conveyed article M is put into the supply device 1, the motor 4 is started, and the screw feeder 6 is driven. Then, in the process of being sent by the screw feeder 6, the transported material M is conditioned such as crushed to the extent that it is sucked into the positive displacement pump P. The positive displacement pump P is activated to press the conveyed product M into the second pipe 42 at a pressure required for long-distance transportation, and the pipeline 40 is pressure-fed to a predetermined position.

By the way, generally, when a conveyed product is pressure-fed by a pipeline, a frictional resistance is generated between the conveyed product and the inner peripheral wall of the pipeline. Due to this frictional resistance, in the vicinity of the inner peripheral wall of the pipeline, between the conveyed products. Due to the difference in speed, the conveyed material near the inner peripheral wall of the pipeline is subjected to a kind of kneading action. In particular, as in this embodiment, a large frictional resistance is generated in the throttle portion 52 whose diameter is gradually reduced toward the downstream side, and a large kneading action is exerted. It is considered that this forms a high-density layer on the outer peripheral portion of the conveyed product. In this way, a high-density layer of the transported material is formed on the outer peripheral portion of the transported material M, which makes it difficult for the lubricant to pass through. Hereinafter, as described above, the lubricant is injected from the lubricant injection device KT and transported.

The test results of the second embodiment are shown below.
As shown in FIG. 4, the total length L; 1250 mm, the length L1 of the narrowed portion; 800 mm, the outer diameter d1 of the entrance end of the expanded diameter portion 51; 139 mm, the maximum outer diameter D of the narrowed portion D: 376 mm,
A compact joint 50 having a minimum outer diameter d1 of the constricted portion 52; 216 mm was prototyped and the effect of the compact joint 50 was tested. The transported material at this time was a mixture of waste wood of the shield construction method and sawdust as a pseudo substance of the dehydrated cake, and had a water content of 31% and a specific gravity of 1.7. The transport amount was 1.8 m ³ / h. Water was used as the lubricant. First, for comparison, the pressure-tight joint 50 was removed, and the second pipe 42 and the third pipe 43 on the downstream side were connected with different-diameter pipes, and the other conditions were the same and tested. The test results are shown in Table 1 below. Table 1 Test times 1st 2nd 3rd time Water injection amount 330 660 1000 (cc / min) Pressure drop in pipe 0.79 0.53 0.20 (kg / cm ² / m) Pressure drop in pipe is , Is a pressure value dropped while the conveyed product is being pumped at a distance of 1 m on the downstream side where water is injected. Next, the consolidation joint 50 was installed between the second pipe 42 and the third pipe 43 on the downstream side, and the other conditions were the same and tested. The results are shown in Table 2 below. Table 2 Test times 1st time 2nd time 3rd time Water injection amount 330 660 1000 (cc / min) Pressure drop in pipe 0.50 0.30 0.17 (kg / cm ² / m) As is clear from the above test, It can be seen that using the consolidation joint 50, the amount of water injected is the same and the pressure drop is small. That is, this means that the highly water-permeable densified layer MM was formed on the outer peripheral portion of the conveyed product M, and the effect of the consolidation joint 50 can be understood.

[0018]

As described above, according to the present invention, when a conveyed product such as a dehydrated cake is pressure-fed by a pipe, the outer peripheral portion of the conveyed substance is covered with a lubricant impervious layer, and Since the lubricant is injected between the inner peripheral wall of the pipe and pumped, the lubricant stays near the inner peripheral wall of the pipe for a long time. Therefore, the effect of the lubricant lasts and long-distance transportation is possible.
The effect peculiar to the present invention can be obtained. Further, since there are few injection points and long-distance transportation is possible, there is an advantage that the manufacturing cost of the lubricant injection device is easy, the liquid content of the conveyed material is not increased, and the running cost is low. According to the invention of claim 2, in addition to the above-mentioned effect, the lubricant hardly permeating layer is formed of a conveyed product whose density is increased by separately kneading a part of the conveyed product, so that the density is increased. It is not necessary to prepare a material for forming the layer, and since the lubricant hardly permeating layer is a part of the conveyed material, the effect of improving the transportation efficiency can be obtained. Further, according to the invention of claim 3, the lubricant impermeability layer is formed by passing through the narrowed portion whose diameter is successively reduced toward the downstream side, so that the long-distance transport can be performed with a simple device. Is obtained.

[Brief description of drawings]

FIG. 1 is a schematic view showing a first embodiment of a pipe transportation device used for carrying out the present invention.

FIG. 2 is an enlarged view of the high-density carrier injection device portion of FIG.
(A) is an overall cross-sectional view, and (B) is a cross-sectional view corresponding to the view cut by a roll in (A), and schematically showing a state in which a conveyed product is conveyed.

FIG. 3 is a schematic view showing a second embodiment of the pipe transportation device used for implementing the present invention.

FIG. 4 is an enlarged front view showing an embodiment of the compression joint of FIG.

[Explanation of symbols]

 1 Supply Device 10 Kneading Device 20 High Density Conveying Product Injecting Device KT Lubricant Injecting Device M Conveying Product MM High Density Conveying Product P Positive Displacement Pump

Claims (3)

[Claims] 1. A transportation method in which when a conveyed product such as a dehydrated cake is pressure-fed by a pipe, a lubricant is injected between the outer peripheral portion of the conveyed substance and the inner peripheral wall of the pipe, and the outer peripheral portion of the conveyed substance is lubricated. A pipe transportation method for a dehydrated cake or the like, which comprises covering with a hardly permeating layer and injecting a lubricant between the outer peripheral portion of the lubricant hardly permeating layer and the inner peripheral wall of the pipe for pressure feeding. 2. The lubricant hardly permeating layer according to claim 1, wherein a part of the conveyed material is separately kneaded to form a conveyed material having a high density.
Pipe transportation method for dehydrated cakes. 3. A pipe, such as a dehydrated cake, which is formed by a conveyed product having a density increased by passing the lubricant hardly permeating layer according to claim 1 through a narrowed portion that is successively reduced in diameter toward the downstream side. Transportation method.