JPH0210033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tank for storing a suspension containing components that may settle out.

Recently, there has been a rapid increase in demand for tanks that store suspensions such as heavy oil and heavy oil/coal mixtures that contain components that may settle and accumulate. Development of a tank is requested.

On the other hand, conventional large storage tanks generally have an upright cylindrical shape with a flat bottom, and when a suspension containing components that may settle and accumulate in the tank is stored, the sediment will accumulate at the bottom of the tank. In addition to reducing the effective storage volume of the tank, when the deposit solidifies, it requires a great deal of effort and time to remove it when the tank is opened.

The present invention has been developed in view of the above-mentioned circumstances, and aims to provide a tank suitable for storing a suspension containing components that are likely to settle and accumulate. , a funnel-shaped slanted bottom having an upwardly facing side wall on the periphery is installed at a distance from the side wall of the tank, and a discharge pipe for discharging the stored liquid on the slanted bottom to the outside of the tank is installed at the lowest part of the slanted bottom, and An annular cover having a downward side wall located opposite to the inside of the above upward side wall is attached to the side wall of the tank in an inverted U-shaped cross section that connects the upper side wall with the space on the lower side of the inclined bottom. A pressure communication chamber of the shape of the shape is formed, and a pipe for supplying and discharging liquid to the lower space is provided on the side wall of the tank, and a release pipe for the sealed air is provided at the highest part of the pressure communication chamber. It is characterized by points.

The present invention has the above-described configuration, and has the basic structure of an upright cylindrical tank with a flat bottom, which has been proven in the past, and is versatile enough to be easily attached and configured without making any special modifications to the tank body. and a sloping bottom is attached to the bottom of the tank,
By utilizing the bottom slope of the tank, it is possible to flow and collect the settled sediment at the lowest part before it begins to solidify, and to take out the settled sediment at the same time as the stored liquid is discharged. This tank is suitable for storing suspensions without stagnation.

Further, in the present invention, a pressure communication chamber (inverted U-shaped ) is provided in the space between the flat bottom and the sloping bottom of the tank itself, so that liquid that does not cause any particular problems even if mixed with the stored liquid (for example, if the stored liquid is mixed with COM→Coal−Oil
When filled (in the case of Mixture, heavy oil), the liquid pressure of the stored liquid is transmitted to the liquid in the space, and the liquid pressure acting on the upper and lower surfaces of the sloping bottom becomes balanced or the liquid pressure difference becomes minimal, causing damage and deformation of the slanted bottom. Not done. Therefore, materials for the inclined bottom can be saved and construction costs can be reduced. Further, it is possible to heat the liquid filling the space and indirectly heat the stored liquid to facilitate dispensing. Incidentally, the increase in volume due to heating of the liquid in the space is communicated with the inside of the tank through the pressure communication chamber, and therefore does not cause any trouble to the tank. Furthermore, in the present invention, an escape pipe for sealed air is provided at the highest part of the bent pressure communication chamber provided extending from the upper peripheral edge of the inclined bottom to the lower side of the inclined bottom, and the escape pipe and the lower part of the inclined bottom are provided with an escape pipe. The sealed air in the pressure communication chamber that is interposed between the liquid stored above the inclined bottom and the liquid in the space is removed by operating the pipe for supplying and discharging liquid into the space provided on the side space. This eliminates the risk of creating an explosive mixture between the two liquids, which is advantageous in terms of tank operation and operating costs.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows an outline of one embodiment, and in the figure A
is an upright cylindrical tank with a flat bottom 1a constructed on ground C and used to store suspension a containing components that may settle and deposit.

The bottom of the tank A is provided with a conical sloped bottom 2 whose lowest point is at the center of the tank, and a space is formed between the sloped bottom 2 and the flat bottom 1a of the tank A.
A discharge pipe 4 for the stored liquid a is provided which extends from the vicinity of the lowest point of the inclined bottom 2 and penetrates the side wall 1 of the tank A.

Furthermore, as shown in FIGS. 2 and 3, the inclined bottom 2
A short cylindrical upward side wall 2' extending upward is provided on the periphery of the tank A, and the upward side wall 2' is arranged at an appropriate distance from the side wall 1 of the tank A. The cover 5 is made up of an upper surface 5' that is sloped low toward the inside in the same way, and a short cylindrical downward side wall 5'' that extends downward from the inner peripheral edge of the upper surface 5'.
Attach the cover 5 to the inside of the side wall 1 of the tank A.
Appropriate intervals are provided between the upper surface 5' and the upper edge of the upper side wall 2', between the lower side wall 5'' of the cover 5 and the upper side wall 2', and between the lower line of the lower side wall 5'' and the inclined bottom 2. The upper side wall 2' of the inclined bottom 2 is covered with a cover 5, and an inverted U is connected from the upper peripheral edge of the inclined bottom 2 to the lower space 2' of the inclined bottom 2 through the upper part of the upward side wall 2'. In addition to providing a pressure communication chamber B bent in the shape of a letter, a relief pipe 7 is provided on the side wall 1 of the tank A to eliminate the air enclosed in the pressure communication chamber B, and the relief pipe 7 is communicated with the highest part of the pressure communication chamber B. It has a similar structure. Furthermore, numeral 6 in the figure is a pipe provided for supplying and discharging liquid b into the spacey. Also,
The upper surface 5' of the cover 5 and the inclined bottom 2 are inclined so that the sediments of the stored liquid a in the tank A flow toward the lower side, thereby preventing the sediments from accumulating.

Since the illustrated embodiment has the above-described structure, when using the tank A, before the storage liquid a is introduced, the storage liquid Filled with liquid b that does not cause any particular problems when mixed, for example, heavy oil/
When storing a coal mixture, it is filled with heavy oil, and then the above-mentioned suspension or storage liquid a is received on the inclined bottom 2.

Figures 4 to 9 show that there is a liquid b inside the spacey.
The procedure is shown in which the stored liquid a is introduced onto the inclined bottom 2, and the sealed air C is removed from the pressure communication chamber B at that time.First, as shown in FIG.
After feeding liquid B into the space I and filling the space I with liquid B to reach the liquid level f, and closing the valve of pipe 6, I feed the stored liquid A into tank A as shown in Fig. 5. When the liquid is filled up to the liquid level g, air C is sealed in the pressure communication chamber B, and the liquid level of the stored liquid A on both sides of the downward side wall 5'' becomes g and g' due to the sealed air C, and the g' side becomes It gets lower.

Therefore, when the valve of the relief pipe 7 is opened to release the sealed air C out of the tank A as shown in FIG. 6, the liquid levels g and g' of the stored liquid A on both sides of the downward side wall 5'' become equal. .

Next, as shown in FIG. 7, the valve of the relief pipe 7 is closed, and the liquid b is sent out from the pipe 6 until the liquid level f reaches the upper edge of the upward side wall 2', and the supply is continued. When the storage liquid a overflows onto the liquid level g', the downward side wall 5''
The liquid level g' of the stored liquid a inside the upward side wall 2' falls, and the liquid level g outside thereof rises, and the liquid level f' of the fluid b is created above the liquid level g' of the stored liquid a. When the volume v ₄ of the fluid b between the liquid level g' and the liquid level f' exceeds the volume v ₅ of the residual air c above it, the flow of the fluid b is stopped and the valve of the pipe 6 is closed. Close.

Furthermore, when the valve of the relief pipe 7 is opened as shown in FIG. is closed, and as shown in FIG. 9, the pressure communication chamber B is completely filled with both liquids a and b, and the boundary between the two liquids is 2. Thereafter, the stored liquid a in tank A can be freely supplied and discharged.

The above procedure is necessary when the tank is put into use or when it is reused after opening the tank, and is usually not necessary. In addition, the storage liquid a is a mixed liquid of heavy oil/coal,
When liquid b is heavy oil, since heavy oil has a lower specific gravity, the liquid level will change as shown in Figures 7 to 9.
At the boundary of the portion g', the mutual diffusion between the liquids a and b is practically negligible and can be ignored.

Therefore, according to the illustrated embodiment, the liquid pressure corresponding to the increase or decrease in the stored liquid in tank A is directly applied to liquid b in space I via both liquids a and b in pressure communication chamber b. The hydraulic pressure transmitted and applied to the inclined bottom 2 becomes substantially equal to both the upper and lower pressures and cancels each other out, so that the hydraulic pressure load on the inclined bottom 2 becomes almost zero. Therefore, damage and deformation of the inclined bottom 2 are prevented, the structural dimensions of the inclined bottom 2 can be reduced, and construction costs can be significantly reduced.

When storing stored liquid a under heating, a necessary insulation structure is provided in advance on the side wall 1 and the roof of tank A,
And, or a heater is provided (not shown).

In addition, a heater (not shown) is provided in the bottom space to heat the liquid b filled inside and indirectly heat the stored liquid a, eliminating the need to provide a heater on the inclined bottom 2. It is possible to make the top of the inclined bottom 2 smooth and to promote the flow of sediment to the dispensing side, thereby promoting the flow and discharge of the stored liquid a and its sediment when discharging the stored liquid a. be.

Furthermore, if the sealed air is stored in the pressure communication chamber B, the sealed air absorbs and buffers the volume increase or decrease in the liquid B in the space B, but the volume of the sealed air C is Since the amount of liquid A fluctuates due to changes in pressure and temperature, it is difficult to accurately grasp the amount of stored liquid A and its changes, and there is also the possibility that the enclosed air C may form an explosive mixture. Although there are drawbacks such as the need to inject active gas, in this embodiment,
As described above, the enclosed air can be easily and completely removed, which is advantageous in terms of tank operation, operating costs, etc.

Furthermore, this embodiment can be attached to a conventional upright cylindrical tank body with a flat bottom without any special modification, and the inclined bottom allows sediment to be collected at the bottom and taken out together with the dispensing liquid. It is ideal as a storage tank for suspensions containing sediment.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an outline of an embodiment of the present invention, FIG. 2 is a plan view of the - cross section of FIG.
The figure is an enlarged view of the part in Figure 1, Figures 4 to 9.
The figure is an explanatory diagram of how the embodiment is used. A: Tank, a: Storage liquid, b: Liquid, A: Space, B: Pressure communication chamber, 1: Side wall of tank, 1
a: flat bottom of the tank, 2: slanted bottom, 2': upward side wall of the slanted bottom, 4: discharge pipe, 5: cover, 5': upper surface of the cover, 5'': downward side wall of the cover, 6: pipe,
7: Escape pipe.

Claims (1)

[Claims] 1 Inside an upright cylindrical tank with a flat bottom, a funnel-shaped sloped bottom with an upward side wall on the periphery is installed with a gap from the side wall of the tank, and the stored liquid on the sloped bottom is placed in the lowest part of the sloped bottom of the tank. In addition to attaching a discharge pipe to the outside, an annular cover having a downward side wall located opposite to the inside of the above upward side wall is attached to the side wall of the tank, and the upward side wall is sandwiched between the upper and lower sides of the inclined bottom. A pressure communication chamber with an inverted U-shaped cross section communicating with the lower space is formed, and a pipe for supplying and discharging liquid to the lower space and the highest part of the pressure communication chamber are attached to the side wall of the tank. A suspension tank characterized in that it is provided with a release pipe for sealed air.