JPS6216383A - Storage tank for suspension - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial usage total] The present invention relates to a suspension storage tank.

[Conventional technology]

Conventionally, storage tanks have been used as equipment to store suspensions, but in order to supply the stored suspensions to the intended process, it is necessary to discharge the suspensions at the same concentration as when they were received. However, when the suspension is stored in a storage tank, the solid particles settle and separate, increasing the concentration of the suspension in the lower part of the storage tank. This not only causes problems in transporting the dispensed suspension, but also causes the suspension to be out of the operating range of the process to which it is supplied.

Therefore, in conventional suspension storage tanks, a highly concentrated suspension is extracted from the bottom of the storage tank and circulated to the top of the storage tank using a pump.
The suspension in the storage tank is kept uniform.

[Problem that the invention seeks to solve]

In the conventional suspension storage tank as described above, the highly concentrated suspension at the bottom of the tank is simply circulated to the top of the tank, so it is difficult to determine how well the suspension in the storage tank is mixed. There is a problem in that it is unclear whether the concentration is uniform, and that the concentration is not uniform when the suspension is circulated.

In addition, if the concentration is not sufficiently homogenized and high concentration suspension is discharged, low concentration suspension remains in the storage tank, and if these decreases repeatedly, the concentration of the discharged suspension will increase. There is a problem with unevenness.

[Means for solving problems]

The suspension storage tank according to the present invention includes a storage tank provided at the bottom of the storage tank body, a delivery pipe having an opening in the storage tank, a delivery pipe communicating with a float suction on the liquid surface of the suspension in the storage tank, and a delivery pipe having an opening in the storage tank. A means for mixing high-concentration and low-concentration suspensions extracted from a dispensing pipe and a device for measuring the concentration of the mixed suspension are provided, and a circulation pipe for circulating the mixed suspension into the storage tank and discharging it to the outside are provided. A dispensing pipe is provided, and the dispensing amount of the high concentration and/or low concentration suspension is adjusted based on the measured value with the measuring device so that the concentration of the mixed suspension becomes the known concentration at the time of receiving. The water is then discharged to the outside or circulated into a storage tank.

[Effect]

In this invention, the %S'fA liquid stored in the storage tank (D Even if the solid particles are separated, the suspension is high in volume and concentration,
The suspension with the lowest concentration is discharged and mixed, and the concentration of this mixed suspension is measured and the discharge amount is adjusted to make it the same as the concentration at the time of reception, so the suspension has almost the same concentration as at the time of reception. be able to circulate it or send it out.

〔Example〕

FIG. 1 is an explanatory diagram of an embodiment of the invention of B.

In the figure, (1) is the storage tank, and (2) is the bottom of the storage tank (1).
a).

(2b) and (2e) are formed. (3) is a dispensing pipe for high concentration suspension arranged horizontally near the bottom of the storage tank (1), (3m), (3b), (3c)
are connected to the dispensing pipe, and the bottom reservoirs (2a), (2b,
(2c) a vertical dispensing pipe having an opening at (4);
(5) is a line mixing device installed in the dispensing pipe (3), (6) is a dispensing pump for high concentration suspension, ( 8)
is a mixing device attached to the service tank (8), (8
b) is the concentration measurement bag installed in the service tank (8)
It is a place.

(10) is a float suction that suspends the suspended fA liquid on the liquid surface (33) in the storage tank (1), and (11) is a flexible delivery pipe connected to the float suction pump from the storage tank (1). The discharge pipe (11) extending outside communicates with the service tank (8), and there is a valve (12) on the way.
.

(14) and a pump (13) are provided.

(20) says 'ay!' from the service tank (8). This is a dispensing pipe for withdrawing liquid A. This is branched into a circulation pipe (20a) and a discharging pipe (2Qb), and the tip of the circulation pipe (20m) is near the liquid level of the suspension in the storage tank (11). The discharge pipe (20b) is open and communicates with the pipe to the process for supplying the suspension.(21) is connected to the circulation pipe (20b).
20a) is the circulation pump, (22) is the dispensing pump, and (23) and (24) are the pumps (21).
, (22) is a valve provided before.

Figure 2 is a diagram showing the experimental results of changes over time in the concentration distribution of the suspension stored in the storage tank (1) of B's invention, where the vertical axis is the height direction of the suspension liquid level, and the horizontal axis is The axis shows the concentration of the suspension. In the figure, (30) is the concentration distribution curve of the suspension;
(31) indicates the position on the concentration distribution curve (30) at the time when the suspension is received in the storage tank (1). Also (3
2) is the position on the concentration distribution curve (30) of the suspension at the time of dispensing after the number of days has passed since the suspension was received; (33)
is the liquid level of the suspension.

From this concentration distribution curve (30), it can be seen that when the suspension is received, the concentration in the height direction up to the liquid level (30) of the suspension in the storage tank (1) is almost uniform; At times,
The concentration at a position near the bottom of the suspension in the liquid level height direction is thick (becomes), and the concentration at a position close to the liquid level (33) is significantly small.

Suspension storage tank (1) configured as shown in Figure 1 above
In order to receive and then discharge a suspension whose concentration distribution curve (30) changes over time as shown in FIG. 2, the following operation is performed. Bottom storage of storage tank (1) (2a) j (2b)
.

The high concentration suspension stored in (2c) is transferred to the dispensing pipe (3a).
).

(3b), (3e) and (3) through the pump (
6), mixed by a line mixing device (5), and put into a service tank (8). Also storage tank (1
The low-concentration suspension at the liquid level (33) in the tank () is taken in by the float pump 9, discharged by the pump (13) through the discharge pipe (11), and then transferred to the service tank (
8).

In this way, the high concentration and low concentration suspensions placed in the service tank (8) are transferred to the mixing device (8a).
The concentration is made uniform while mixing with a measuring device (8b), and the concentration is measured with a measuring device (8b). Based on the measurement results, the valves (4) and (71) are set so that the concentration in the service tank (8) becomes the known suspension concentration at the time of reception.

(12) Adjust the opening degree of (14) to adjust the amount of highly concentrated suspension to be put into the service tank (8).

Then, the valves (23) and (24) are opened, and the suspension in the service tank (8) is pumped by the pump (22) to the target process through the discharge pipes (20) and (20b).

As mentioned above, the mixture is mixed in the service tank (8) and the concentration is measured, and high concentration and Once the relationship between the amount of low-concentration suspension and the amount dispensed to the service tank (8) is determined, if the conditions are maintained, the suspension in the storage tank (1) will be continuously mixed while being mixed in the service tank (8). can be pumped to the desired process at the same concentration as when received.

In addition, in order to equalize the concentration of the suspension in the storage tank (1), the suspension that has almost the same concentration as when it was received must be pumped through the valve (23).
) is opened and the pump (21) is opened to circulate the liquid to the liquid level in the service tank (8) and storage tank (1).

As a result, even if the suspension is stored for a long time, the storage tank (1)
Since the concentration of the suspension in the storage tank (1) is made uniform, the solid particles in the highly concentrated suspension at the bottom of the storage tank (1) will not be separated and settled, compressed, and become unable to flow.

FIG. 3 is an explanatory diagram of another embodiment of the invention.

In the figure, (1) to (5), (8) to (8a), (1
0) to (14) and (33) are the same as the embodiment shown in FIG. In the figure, (40) is a discharge pipe of the service tank (8) equipped with a discharge pump (41), and the tip communicates with the discharge pipe (3), and there is also a branch pipe (42) in the middle. It is communicated. (43) is a pump provided between the dispensing pipe (40) and the branch pipe (42) which are communicated with the dispensing pipe (3);
45) is a valve attached to the dispensing pipe (40) and the branch pipe (42), and (4B) is a concentration measuring device provided in the dispensing pipe (3). The dispensing pipe (3) extending outside the storage tank (1) has a circulation pipe (47) and a dispensing pipe (4) at its tip.
7a), and the circulation pipe (47) is arranged so that the open end thereof is located near the liquid level (33) of the suspension in the storage tank (1). (48) and (49) are valves attached to the circulation pipe (47) and the discharge pipe (47a).

In this example, the following operation is performed to dispense a suspension having approximately the same concentration as when received.

First, pay out from the bottom storage (2m), (2b), (2e)! (3a) (3b), (3e) and (
3) through which the highly concentrated suspension is extracted by a pump (43). In addition, low concentration suspensions can also be prepared using float succilin (l
It is extracted from the pump (13) through the discharge pipe (11) and put into the service tank (81).
m) to make the concentration uniform. The concentration of this uniformly concentrated low-concentration suspension is measured by a concentration measuring device, and the pump (41) flows from the dispensing pipe (40) into the dispensing pipe (3). The high and/or low concentration suspensions are mixed and measured by the concentration meter N (46), so that the concentration of the mixed suspension is approximately the same as the concentration at the time of reception. The amount of low concentration suspension is controlled by valves (4), (44), (42).
) is adjusted by the opening degree of the pipe (47m), and is delivered to the target process through the delivery pipe (47m).

In addition, in order to equalize the concentration of the suspension in the storage tank (1),
The mixture of the above-mentioned high concentration and low concentration suspensions is returned to the storage tank (1) through the circulation pipe (47).

〔Effect of the invention〕

As explained above, even if the suspension contains solid particles that separate and settle in the storage tank, the present invention can dispense the suspension at the same concentration as when it was received into the storage tank, and moreover, Since the concentration of the suspension to be stored can be made uniform, it has the effect of enabling long-term storage.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of this invention, FIG. 2 is a diagram of a concentration distribution curve of a suspension, and FIG. 3 is an explanatory diagram of another embodiment of this invention. In the figure, (1) is the storage tank, (2) is the bottom of the storage tank, and (3) is the bottom of the storage tank.
1゜(3a), (3b), (3c), (11),
(20), (20a), (40), (47m)
is the discharge pipe, 14), (7), (12), (14
), (23), (44), (45). (48) (49J is a valve, (5) is a line mixing device, (61, (13), (21), (22)
), (41), and (43) are pumps, (8) is a service tank, (8a), (46) are concentration measuring devices, and (10) is a float succincon. Agent Patent Attorney Tadashi Sato Figure 2 4m (A ← High) Figure 3

Claims (1)

[Scope of Claims] (a) A storage tank with a reservoir at the bottom for storing the suspension; (b) a dispensing pipe having an opening in the reservoir; (c) a discharge pipe for storing the suspension stored in the storage tank; A float suction on the liquid surface and a dispensing pipe communicating therewith; (d) means for mixing each of the suspensions discharged by the dispensing pipes in (B) and (C) above; (e) in (d) above; A device for measuring the concentration of the mixed suspension; (f) a pipe for discharging the mixed suspension in (d) above to the outside of the pipe circulating to the storage tank, and measuring the concentration measured in (e) above. , above (d)
Adjust the amount of the suspension to be dispensed in (B) and (C) above so that the concentration of the mixed suspension is the same as the concentration of the suspension when received into the storage tank. A suspension storage tank in which a suspension having approximately the same concentration as the liquid is discharged to the outside or circulated into the storage tank.