JPH0457784A - Carrying method of plastic fluid and apparatus therefor - Google Patents

Abstract

PURPOSE:To conduct suction from reservoir tank suction ports efficiently without a break by blowing a thixotropic plastic fluid in a reservoir tank from hierarchically arranged blow-off ports in every stage in the vertical direction to agitate the whole in a common liquid and by carrying the fluid out of discharge pipes adjacent to the blow-off port after agitation. CONSTITUTION:To discharge a thixotropic plastic fluid (a) e.g. in a ship's hold 1, valves 7, 9 are opened and the plastic fluid (a) abundant in fluidity occupying the upper part of a reservoir tank 1 is sucked from any of suction ports 5a-5j by a pump P and carried via pipes 6, 8. A valve 11 is opened so that the fluid is blown from all or any of blow-off ports 4a-4j into the reservoir tank 1 in the manner of circulating therein. The plastic fluid (a) is agitated in a common liquid from the upward side poor in thixotropic properties so as to be agitated by stages in the vertical direction according to the sort, shape, density, etc., of a particle to abound in fluidity. When the fluid has a sufficient fluidity, the plastic fluid (a) in the lower part of the reservoir tank 1 is discharged via discharge pipes 13, 8 by the pump P.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for discharging a thixotropic plastic fluid.

[Prior Art] Conventionally, when transporting Newtonian fluid, such as heavy oil, stored in a storage tank to the outside, heating is used to reduce the viscosity of the cargo handling fluid in order to mix the fluid relatively homogeneously. While pumping, the liquid was stirred using a stirring pump or a stirrer with stirring blades to generate circulation or convection before being transported out.

However, it is known that some types of suspensions have thixotropic properties, which are different from the properties of Newtonian fluids. In other words, thixorhodobic property means that a continuous structure is created inside the suspension due to the traction force between the particles dispersed in the suspension, and flow occurs only when this structure is broken by shearing, but after that, when it is left still This is a physical property in which the structure that was once destroyed by shearing is re-formed and fixed (restored to its original structure).

One such thixotropic plastic fluid is a suspension of calcium carbonate.

This calcium carbonate is used in rubber, plastics,
Demand continues to increase for paints, pigments, paper manufacturing, fertilizers, toothpaste, pharmaceuticals such as acid preparations and antacids, organic synthesis, cosmetics, etc. At present, if the liquid is used for transportation, the liquid cannot be easily fluidized due to the thixolodobic properties of the suspension, so that the inflow of the liquid from the suction port may be interrupted.

For this reason, the actual situation is that the material is transported in a powder or solid state. Therefore, at present, a lot of time, equipment costs, management costs, etc. are spent on transportation and storage.

[Problem to be solved by the invention]

As mentioned above, when transporting a plastic fluid with thixotropy, its structure must be destroyed by shearing due to its characteristics, and if the conventional co-liquid stirring means used for Newtonian fluids were to be adopted, the equipment cost would be high. Moreover, the shearing was insufficient to destroy the structure of the plastic fluid and give it fluidity, and the suction from the suction port tended to be interrupted, making it impossible to perform it smoothly and efficiently. Furthermore, they were unable to respond to the demands of the times because they were unable to respond to the diversification of liquids.

For this reason, the present invention is capable of efficiently transporting a large amount of thixotropic plastic fluid without interrupting the suction from the suction port, without incurring equipment costs, management costs, etc. It is an object of the present invention to provide a method and device for conveying a thixotropic plastic fluid suitable for diversification of liquids.

[Means to solve the problem]

The present invention has been made to achieve the above object, and one of the inventions is to step up and down a thixotropic plastic fluid contained in a storage tank from blow-off ports arranged in layers in the storage tank. We adopted a method consisting of a step of agitating the entire body by blowing out tactile fluid at each time, and a step of carrying out the fluidized plastic fluid from a discharge pipe provided close to the outlet after stirring.

Further, another invention provides a storage tank containing a thixotropic plastic fluid, a stirring outlet arranged hierarchically in the storage tank, a pump as a driving source, and a pump connected to the pump and close to the outlet. The plastic fluid is made up of a suction port arranged hierarchically in the storage tank, and a discharge pipe part provided in the storage tank, and after the plastic fluid is stirred by tactical stirring from the outlet, the plastic fluid is discharged from the discharge pipe part. We adopted the method of transporting the

[Effect]

In order to transport the thixotropic plastic fluid contained in the storage tank to the outside, the thixotropic plastic fluid inside the storage tank is blown out from the blow-off ports arranged in layers in the storage tank, and the thixotropic plastic fluid inside the storage tank is transported step by step. After the plastic fluid is mechanically stirred and sheared to destroy the structure caused by the bonding force due to interparticle bonds, it is fluidized and is sucked out by a pump from a discharge pipe close to each outlet.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention is applied to a ship for marine transportation will be described below with reference to the drawings.

1 is a ship serving as a storage tank in which an appropriate number of tanks are installed at the lower part of the deck 3 of a ship 2, and a thixotropic plastic fluid a is stored in this ship 1 (in the figure, only one ship l is displayed).

4a, 4b, 4c, 4d, 4e, 4f, 4g4h, 4i
, 4j are a large number of air outlets arranged in layers along the vertical direction of the side walls 1a, la so as to face each other at appropriate intervals in the vessel 1, and these air outlets 4a, 4b, 4c, 4
d, 4e, 4f, 4g.

By sequentially blowing out the plastic fluid a circulated from 4h, 4i, and 4j to the ship 1 in the vertical direction from above to the bottom, the plastic fluid a housed in the ship 1 is stirred step by step. The resulting shearing breaks the interparticle bonds in the suspension, destroys the structure and fluidizes it, and prevents it from becoming immobilized again due to changes over time.

Although a suspension of calcium carbonate is used as the plastic fluid a in this embodiment, the plastic fluid a is not limited to this.

5a, 5b, 5c, 5d, 5e,
5f, 5g.

5h, si, and sj are the air outlet ports 4a, 4b, and 4c.

4d, 4e, 4f, 4g, 4h, 4i, and 4j, and are arranged in layers along the side wall 1a at positions slightly above the suction ports 5a, 5b, 5c, 5.
d, 5e, 5f, 5g, 5h.

The plastic fluid a after co-liquid stirring is sucked and circulated into the blow-off ports 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4 into the blow-off ports 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4.
It is used for blowing air from i and 4j into the ship 1.

The plastic fluid a is circulated from the ship 1 to the outlet 4a.

4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4
Each suction port 5a is used to blow air from the air outlet.

5b, 5c, 5d, 5e, 5f, 5g, 5h, 5i, 5
A valve 7 provided in the middle of the primary side pipe section 6 where j is concentrated
is first opened, then sucked by the pump P as a driving source, and then the valve 9 provided in the middle of the secondary side pipe section 8 is opened.
and the air outlet 4a, 4b, 4c, 4d, 4e, 4f, 4
g, 4h, 4i.

By opening the valve 11 connected to the pipework 0 integrated in 4j, the plastic fluid a is circulated and the air outlet 4a, 4b, 4c, 4d+
4 e.

From 4f, 4g, 4h, 4i, and 4j, the air is blown out in stages, for example, from above to below. In this case, if the plastic fluid a is stirred step by step from the top to the bottom, the concentration of the plastic fluid a is lower, the specific gravity is lighter, the degree of sedimentation of particles is less, and the molecular bonding force is weaker. This is because it has a lower degree of thixotropy and more fluidity.

A manifold (not shown) is connected to the rear end of the pipe portion 8 to form a discharge pipe for the plastic fluid a.

Reference numeral 12 denotes a well section provided at a suitable position on the bottom of the vessel 1 so as to be close to at least the air outlet 4j, and one end of the discharge pipe section 13 is disposed at one end of the upper part of the well section 12. The other end of the discharge pipe section 13 is connected to the pump P via a valve 14.

For economic reasons, the pump P is driven to rotate by using the engine E for driving the ship. 15 is a partition wall.

One embodiment of the present invention has the above structure, and the operation will be explained step by step below.

(Storage process) First, a plastic fluid a having thixotropy is placed inside the ship 1.
In order to supply and store a suspension of calcium carbonate, it is supplied from a shipping pump on land through piping (not shown) and stored. By storing the plastic fluid a in the storage tank 1 in this manner, it is used for marine transportation from the loading port to the unloading port.

(Stirring process) After that, the plastic fluid a, which has been fixed again by standing still, is stirred and fluidized to make it easier to discharge the calcium carbonate suspension that settled at the bottom of the ship 1 during transportation. There is a need to.

To do this, first open the valve 7.9 and then drive the pump P to draw the plastic fluid a, which occupies the upper part of the storage tank 1, which has weak interparticle bonding force and is rich in fluidity, into the suction port 5a.
, 5b, 5c, 5d, 5e.

Any one of 5f, 5g, 5h, 5i, and 5j is sucked in and conveyed through pipe portions 6 and 8. Next, open the valve 11 and open the air outlets 4a, 4b, 4c, 4d4e, 4f, 4g, 4.
By circulating the plastic fluid a from all or any of h, 4i, and 4j and blowing it out into the storage tank 1, complicated valve operations are performed by tactically stirring the plastic fluid a from the upper side, which has the least thixotropy. The plastic fluid a in the storage tank 1 is stirred in stages in the vertical direction according to the type, shape, concentration, etc. of the particles. In this manner, the plastic fluid a having thixotropy in the storage tank 1 is stirred as a whole within the storage tank 1, thereby increasing its fluidity.

(Transporting process) When the plastic fluid a has sufficient fluidity, the plastic fluid a in the lower part of the storage tank 1 is sucked by the driving force of the pump P and discharged through the discharge pipe section 13.8.

In the above embodiment, there are suction ports 5a, 5 in the storage tank 1.
b, 5c, 5d, 5e, 5f, 5g, 5h, 5i, 5j
For example, the hierarchy and arrangement are as follows, and the air outlets 4a, 4b, 4
c, 4d, 4e, 4f, 4g.

4h, 4i, and 4j are arranged facing each other, but the number and arrangement of the installed pieces are arbitrary. Factors that determine the thixolodby property of the plastic fluid a, such as the type, shape, particle size distribution, and concentration of particles as dispersoids. , arbitrarily selected depending on the type of dispersion medium. Furthermore, in the above embodiments, a suspension of calcium carbonate was used as a representative example of the thixotropic plastic fluid a, but the present invention is not limited to this, and it goes without saying that other suspensions may be used.

Further, the valves 7.9, 11.14 in the above embodiments are not limited to manual operation, but can be electrically controlled by using electromagnetic valves or the like to automatically control operations such as blowing, suction, and conveyance as necessary. .

Further, although the above embodiment has been described as a typical example in which the device is installed on a ship 1, it goes without saying that the present invention can also be applied to ground equipment.

〔Effect of the invention〕

As described above, by employing tactical stirring, this invention enables efficient and continuous suction of thixotropic plastic fluid from the suction port in the storage tank.
This makes it possible to transport a large amount, lower costs such as equipment costs and management costs, and furthermore, it is possible to handle the diversification of suspensions according to demand.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. 1... Ship, 2... Ship, 4a, 4b, 4
c, 4-d4e, 4f, 4g, 4h, 4i, 4j-
Air outlet, 5a, 5b, 5c, 5d, 5e, 5f, 5g,
5h, 5i, 5j... Suction port, 6, 8, 10.12.
・・Pipe part, 7, 9, 11. 14・・Pulp, 13・・
- Discharge pipe section, a... plastic fluid, E... engine.

Claims (2)

[Claims] (1) A step of stirring the entire thixotropic plastic fluid contained in a storage tank by blowing out the co-liquid in stages in the vertical direction from blow-off ports arranged in layers in the storage tank; A method for discharging a thixotropic plastic fluid, which comprises the step of subsequently discharging the fluidized plastic fluid from a discharge pipe provided close to the outlet. (2) A storage tank containing a thixotropic plastic fluid, a stirring outlet arranged hierarchically in the storage tank, a pump as a driving source, and a pump connected to the pump and close to the outlet. It consists of a suction port arranged hierarchically in the storage tank and a discharge pipe section provided in the storage tank, and after the plastic fluid is stirred by co-liquid stirring from the outlet port, the plastic fluid is discharged from the discharge pipe section. A device for transporting a thixotropic plastic fluid.