JPH02125029A - Mixture force feeding device - Google Patents

Abstract

PURPOSE:To aim at making long-distance transportation possible by providing a force feed pipe, a compressed air feeding device and an ejector connected to the mutual discharge opening of transport devices and making the diameter of the force feed pipe gradually larger toward the downstream side, thereby making piping resistance in long-distance transportation small. CONSTITUTION:The stored object of a mud feeding hopper 1 is energized from a discharge opening 3 by means of a pressure pump 4 operated by the driving of a screw conveyor 2 and is blown into a force feed pipe 5 from an air blow pipe 6a toward an ejector 6. This object is transported in the plug flow state of the lumps of the transported object and the lumps of air being alternately disposed in the force feed pipe 5. In the case of long distance, the part of the force feed pipe in the vicinity of the ejector 6 is made relatively small in its bore, and after a plug is once made, the bore is made gradually large in piping such that the bore of a force feed pipe 5a around the ejector 6 is made 150A and that of a downstream side force feed pipe 5c is made 300A. Stable long- distance transportation can be thus made possible.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to a mixed pumping device for semi-fluid substances such as sludge and soft mud deposited in, for example, water intakes of 9 submarine power plants, lakes, rivers and 9 ports. It is related to.

[Conventional technology] Conventionally, plug transport (
Plug flow transport) was being carried out. As shown in Figure 0'S2, the discharge pipe had the same diameter from the air inlet to the discharge pipe outlet.

[Problems to be Solved by the Invention] However, the conventional mixed pumping device simply blows compressed air into the pumping pipe through an ejector, and depending on the nature of the sludge, soft mud, etc., the pipe resistance may be large. It is necessary to handle materials, but during transportation, it is difficult for normal plug flow to form in the pipes, which often causes clogging.

[Means to solve the problem] The present invention aims to solve these problems.

A mixed pumping device for sludge, soft mud, and other semi-liquid substances, comprising a transport device, a pressure pipe connected to a discharge port of the transport device, a compressed air supply device that supplies pressurized air to the pressure pipe, and an ejector. In the mixed pressure feeding device, the diameter of the pressure feeding pipe was increased stepwise from the upstream side to the downstream side.

In the second invention, the diameter of the pressure pipe is 150A (JIS standard) at the most upstream side and 300A (JIS standard) at the most downstream side.
standard).

[Function] In the mixed pumping device of the present invention, the transported material sent from the discharge port of the transport device is transported by plugging by blowing pressurized air from the ejector through the air blowing pipe provided in the middle of the pressurizing pipe. In this way, the cargo flows in the discharge pipe as a plug flow, is smoothly transported over long distances, and is discharged onto land or into a ship's hold.

The pressure pipe in the mixed pressure feeding device of the present invention has a relatively small diameter in the vicinity of the ejector, and it is easy to form a plug flow. As the diameter of the pipe becomes larger, the cross-sectional area becomes larger and the resistance of the pipe becomes smaller, so that the water flows smoothly thereafter.

[Example] Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 is an overall system diagram showing one embodiment of the present invention, and the main equipment is basically the same as that of the conventional example shown in FIG. In FIG. 1, l indicates the slurry supply hopper 22 is a screw conveyor, 3 indicates a discharge pipe of the screw conveyor, and 4 indicates a screw conveyor.
is a pressurizing device, 5 is a pressure feed pipe (5a is a small diameter pipe, 5b is a medium diameter pipe, 5c is a large diameter pipe), 6 is an ejector, 7 is an Ml electromagnetic on-off valve 8 is a compressed air supply pipe, 9 is a compressor, 1o is'r
rf, magnetic on-off valve, magnetic water-off valve In Fig. 2, it is the same as in Fig. 1 except that the pressure feed pipe 5 has the same diameter (200A).

Next, the operation in the embodiment of the present invention will be explained.

First, the transported material stored in the mud supply hopper 1 is pressurized from the discharge port 3 of the screw conveyor 2 by driving the screw conveyor 2 as a transportation device! H! ! Compressed air is energized by (pressurizing pump) 4 and directed to ejector 6, and then supplied from compressor 9. The compressed air passes through compressed air supply pipe 8 and through electromagnetic on-off valve 7, which is kept open. Then, the air is blown into the pressure feeding pipe 5 from the air blowing pipe 6a.

As a result, the transported material such as sludge or soft mud is discharged into the pressure feeding pipe 5 in a so-called plug flow state in which lumps of the transported material and air lumps are arranged alternately. 0 or more being transported through the tube is a normal transport condition.

The operations described above are basically the same in the conventional example shown in FIG. 2 as in the embodiment of the present invention shown in the first factor.

However, if the transportation distance is particularly long or the nature of the transported material is high, piping resistance may be large due to high viscosity or high specific gravity, and normal plugs or
If transport conditions are poor, such as when it is difficult to form a flow, in the present invention, as shown in the embodiment of FIG.
Same air mixing ratio (air amount kg/dry weight of transported material kg)
In the case of pressure-feeding, the flow velocity in the air pipe increases due to the small transport cross-sectional area, making it easy to form a plug. Also, plug 1
Since the amount of particles is small, the amount of conveying air can also be small.

On the other hand, since the air velocity is high and the piping resistance is also large, long-distance transportation is difficult.Therefore, in the piping after the plug has been formed, the diameter of the pressure feeding pipe 5 is gradually changed to reduce the piping resistance. In the case of this embodiment, among the pressure feed pipes 5, the pressure feed pipe 5a near the ejector 6 is 150A (JIS standard), while the pressure feed pipe 5C on the downstream side is 300A (JIS standard). Good results were obtained when a 200A pipe was used for the intermediate pressure feed pipe 5b, and although the transport distance exceeded 200 m, stable and normal transport could be achieved.

In addition, when the diameters of all the pressure feed pipes 5 are set to 200A, the pipe resistance is small, but because the cross-sectional area is large, the flow velocity in the air pipe near the ejector is slow, making it difficult to form a plug, which often causes clogging in the early stages of operation. Stable operations were not possible.

[Effect of the invention] As explained above, by adopting the configuration of the present invention,
Stable plug formation can be easily achieved, piping resistance is low, so long-distance transportation is possible, and a highly reliable mixed pumping device that can adequately respond to changes in the properties of transported objects can be provided. Furthermore, since piping resistance is reduced, the initial cost and running cost of the compressed air supply device can be reduced.

[Brief explanation of drawings]

FIG. 1 is an overall system diagram showing one embodiment of the present invention, and FIG. 2 is an overall system diagram showing a conventional mixed pumping device. 1...Mud supply hopper, 2...Screw conveyor, 3...Discharge port, 4...
... Pressure device, 5 ... Pressure feed pipe, 6.
... Ejector, 6a... Air blowing pipe, 9
...Compressor, 20...Plug. Patent applicant Ube Industries Co., Ltd.

Claims (2)

[Claims] (1) A mixed pumping device for sludge, soft mud, and other semi-liquid substances, including a transport device, a pressure pipe connected to the discharge port of the transport device, and a compressed air supply device that supplies pressurized air to the pressure pipe; A mixture pumping device comprising an ejector, characterized in that the diameter of the pumping pipe is gradually increased from the upstream side to the downstream side. (2) A mixed pumping device according to claim 1, in which the most upstream diameter of the pressure feeding pipe is 150A and the most downstream diameter is 300A.