JPH05261316A - Collected amount monitor of solid/liquid separator - Google Patents

Abstract

PURPOSE:To improve the operating efficiency, safety and reliability of a solid/ liquid separator by providing a means to calculate and store the amount of a solid and a means to sound a warning, if the amount of a collected solid reaches the first stage setting level and close the introduced flow of a spent liquid, if the amount reaches the second stage setting level. CONSTITUTION:A solid/liquid separator 1 consists of a rotary container 1d, a drive device 1a, a rotating shaft 1c, a bearing 1b and a casing 1e. The amount of a solid collected in the rotary container 1d is calculated in terms of a voltage value obtained by a piezoelectric element 1f attached to the lower part of the bearing 1b. This calculation value is constantly displayed and stored by a calculation/storage device 1j. The separator 1 is equipped with this device 1j and an indicator 1k. If the collected amount of the solid reaches a specified level in the first stage, a warning is sounded by an alarm 11. Further, if the amount of the solid reaches a specified level in the second stage, a liquid feed valve 2a on a liquid feed pipe 2 which introduces a spent liquid is closed using an indicator 1m.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collection amount monitoring device for a solid-liquid separator equipped with a rotary container for centrifuging solid and liquid components from waste liquid containing the solid component.

[0002]

2. Description of the Related Art Generally, in reprocessing nuclear fuel, a solid-liquid separator is used which separates and removes solid fine particles of insoluble fission products from a nitric acid solution in which spent nuclear fuel is dissolved, by using centrifugal force.

In this solid-liquid separator, a rotary container having an open lower part or an upper part is rotated at a high speed, and a liquid supply pipe is inserted from the opening part of the lower part or the upper part so as to contain a solid content in the rotary container. The waste liquid as a solution is supplied to separate the solid liquid.

Conventionally, the amount of the solid content separated and removed in the rotary container is determined by the concentration of the solid content in the waste liquid before being supplied to the solid-liquid separator and in the treatment liquid after the solid-liquid separation treatment. It was calculated by measuring the concentration of the residual solid content of and measuring the difference in the solid content.

FIG. 3 is a schematic diagram showing a conventional solid-liquid separator and its piping system. That is, in FIG.
A liquid supply pipe 2, a cleaning liquid pipe 3, a treatment liquid discharge pipe 4 and a solid content discharge pipe 5 are connected to the solid-liquid separator 1, and the liquid supply pipe 2 is provided with a liquid supply sampling device 6 and a treatment liquid discharge pipe. A processing liquid sampling device 7 is connected to 4. The solid-liquid separator 1 is composed of a drive device 1a, a bearing 1b, a rotary shaft 1c, a rotary container 1d and a casing 1e.

Waste liquid containing solids is supplied from a liquid supply pipe 2 into a rotating container 1d which rotates at a high speed via a rotating shaft 1c supported by a bearing 1b by a driving device 1a, and is discharged from the liquid by a centrifugal force. Solid container with a large specific gravity is 1d
Are attached and collected on the inner wall of the. The processing liquid from which the solid content has been separated overflows to the outside of the rotary container 1d and is recovered from the inside of the casing 1e through the processing liquid discharge pipe 4.

A washing process in which the supply of the waste liquid is stopped when a predetermined amount of solid content is collected, and the solid solution is washed away by injecting the cleaning liquid sent from the cleaning liquid pipe 3 while rotating the rotary container 1d at a low speed. Then, the washed solid content is collected through the solid content discharge pipe 5.

In the above solid content collection step, the solid content collection amount in the rotary container 1d is measured by the concentration of solid content in the waste liquid measured by the feed liquid sampling device 6 and the treatment liquid sampling device 7. The concentration of solids in the treatment liquid,
Calculated from the total amount of waste liquid supplied.

[0009]

However, in the above-described conventional solid content collection amount calculation method, it is necessary to sample the solution periodically when the concentration of the solid content in the waste liquid is not constant. The analysis of the liquid also requires a great deal of labor and time, which hinders the efficient operation of the solid-liquid separator.

Further, since the collection performance of the solid-liquid separator largely depends on the supply flow rate of the waste liquid, it is necessary to keep the supply flow rate constant at all times. Furthermore, there is a possibility that an error may occur between the specific gravity of the solid content in the sampling liquid and the specific gravity of the collected solid content. There are problems such as container damage and abnormal vibration.

The present invention has been made to solve the above problems, and improves the operation efficiency of a solid-liquid separator, avoids an overload state, and maintains stable operation without fear of damage to the rotary container. In order to do so, it is an object to provide a highly reliable collection amount monitoring device for a solid-liquid separator.

[0012]

The present invention relates to a cylindrical rotary container for centrifuging the introduced waste liquid into a solid content and a supernatant.
A drive device that rotationally drives the rotary container, a rotary shaft that connects the rotary container and the drive device, a bearing that supports the rotary shaft and the rotary container, and a bearing that fixedly supports the bearing and includes the rotary container. A solid-liquid separator including a casing; means for calculating the amount of solids collected in the rotary container from a voltage value obtained by a piezoelectric element attached to the lower portion of the bearing, and the solids collection Means for constantly displaying and storing the amount, means for issuing an alarm when the amount of the solids collected reaches a predetermined amount set in the first stage, and the amount of the solids collected is the second stage It is characterized by comprising means for closing the valve of the pipe for introducing the waste liquid when the predetermined amount set in (1) is reached.

[0013]

[Operation] When solids are collected and collected in the rotating container,
The weight of the rotating container increases. This increase in weight increases the thrust static load of the bearing through the rotary shaft connected to the rotary container.

The piezoelectric element attached to the lower part of the bearing generates a voltage proportional to the applied load. Therefore, the relationship between the collected amount of solids and the voltage value generated by the piezoelectric element is experimentally obtained in advance, and this relational expression is stored in the calculation / storage device, and the actual machine data is processed and calculated to perform the actual operation. The amount of solids collected can be easily grasped.

As a result, it is possible to easily judge whether the operation is continued or stopped while monitoring the state of the collected amount.
It can improve the operating rate of the operation and greatly contribute to prevention of accidents due to overload operation.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the collection amount monitoring device for a solid-liquid separator according to the present invention will be described with reference to FIGS.
FIG. 1 is a system diagram showing an embodiment of a collection amount monitoring device for a solid-liquid separator according to the present invention. In FIG. 1, reference numeral 1 is a solid-liquid separator, and the solid-liquid separator 1 is a cylindrical rotary container 1d for centrifuging solids, a drive device 1a for rotating the rotary container 1d, and the rotary container. A rotating shaft 1c that connects 1d and the driving device 1a, a bearing 1b that supports the rotating shaft 1c and the rotating container 1d, and a bearing 1b.
And a casing 1e for fixedly supporting the. A piezoelectric element 1f is attached below the bearing 1b, and the piezoelectric element 1f is connected to the charge amplifier 1g through a lead wire. The output signal of the charge amplifier 1g is monitored by the monitor 1h. An A / D converter 1i that converts the output signal of the charge amplifier 1g into a digital signal is connected, and this A / D converter 1i is connected to a calculation / storage device 1j that calculates the trapped amount of solids. Arithmetic / storage device 1
j is an indicator 1k that displays the collected amount every moment, an alarm device 11 that sounds when a predetermined collected amount is reached, and a liquid supply valve 2
An indicator 1m for sending an opening / closing instruction signal is connected to a.

FIG. 2 is a characteristic diagram showing an empirical formula incorporated in the calculation / storage device 1j for calculating the amount of collected solids. This empirical formula is obtained by empirically obtaining the relationship between the amount W of collected solids and the voltage value V of the piezoelectric element, and calibrating the experimental data by performing regression analysis processing. For example, the formula W = aV + b It is represented by. Here, a and b are obtained as regression coefficients when the regression analysis processing is performed.

Since the weight of the experiment is known, it suffices to add a weight to the rotary container, and sufficient data can be obtained to easily derive the empirical formula.

During operation of the solid-liquid separator 1, the bearing 1 is continuously
The voltage V generated in proportion to the thrust load is measured by the piezoelectric element 1f attached to the lower part of b, and the A / D converter 1i is measured.
By inputting the signal converted into the digital amount in the arithmetic / storage device 1j and calculating it, the trapped amount W of the solid content can be calculated. Since this result is displayed on the display 1k, the current collection amount can be constantly monitored online.

When the predetermined collection amount set in the first stage is reached, the alarm device 1l utters and notifies the operator. When the operator hears this alarm, the operator stops the supply of waste liquid and moves to the cleaning process. Even if the alarm device 1l breaks down or the operator misses the alarm, if the rotating container 1d reaches the set second-stage collection amount within a sufficiently safe range, the indicator 1m A signal is sent to close the liquid supply valve 2a installed in the supply pipe 2, and the liquid supply valve 2a is closed, so that the supply of waste liquid is stopped. Therefore, it is possible to avoid collecting the solid content in excess of the collection capacity of the solid-liquid separator 1.

With the collection amount monitoring device of the solid-liquid separator having the structure as shown in this embodiment, it is not necessary to perform complicated sampling work of the solution, and much labor and time required for analysis of the sampling liquid are required. Can be reduced. Furthermore, even if the collection performance of the solid-liquid separator changes greatly depending on the supply flow rate of the waste liquid, it is not necessary to keep the supply flow rate constant at all times.
The solid-liquid separator can be operated efficiently, and there is no possibility of collecting a certain amount of solids or more and operating in an overloaded state, resulting in damage to the rotating container or abnormal vibration. There is no fear, and safety and reliability are improved.

In this embodiment, the voicing voltage of the piezoelectric element is used for measurement, but the method is not limited to this method. For example, a load meter using a strain gauge can be used to measure the thrust load.

[0023]

According to the present invention, the operating rate of the solid-liquid separator can be improved, and the safety and reliability of the main body of the solid-liquid separator can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a part of an embodiment of a collection amount monitoring device for a solid-liquid separator according to the present invention.

2 is a calculation for calculating the amount of solids collected in FIG.
FIG. 3 is a characteristic diagram showing an example of an empirical formula incorporated in a storage device.

FIG. 3 is a configuration diagram showing a collection amount monitoring device of a conventional solid-liquid separator.

[Explanation of symbols]

1 ... Solid-liquid separator, 1a ... Drive device, 1b ... Bearing, 1c ...
Rotating shaft, 1d ... Rotating container, 1e ... Casing, 1f ... Piezoelectric element, 1g ... Charge amplifier, 1h ... Monitor, 1i
... A / D converter, 1j ... Calculation / storage device, 1k ... Display device, 1l ... Alarm device, 1m ... Indicator, 2 ... Liquid supply pipe, 2a ...
Liquid supply valve, 3 ... Cleaning liquid pipe, 4 ... Treatment liquid discharge pipe, 5 ... Solid content discharge pipe, 6 ... Liquid supply sampling device, 7 ... Treatment liquid sampling device.

Claims (1)

[Claims] 1. A cylindrical rotary container for centrifuging the introduced waste liquid into a solid content and a supernatant liquid, a drive device for rotationally driving the rotary container, and a rotary device for connecting the rotary container and the drive device. A solid-liquid separator comprising a shaft, a bearing for supporting the rotary shaft and the rotary container, and a casing for fixedly supporting the bearing and enclosing the rotary container; solid content collected in the rotary container Means for calculating the amount from a voltage value obtained by a piezoelectric element attached to the lower part of the bearing, means for constantly displaying and storing the amount of the solid content collected, and the amount of the solid content collected in the first stage Means for issuing an alarm when the set predetermined amount is reached, and means for closing the valve of the pipe for introducing the waste liquid when the collected amount of the solid content reaches the predetermined amount set in the second stage And a collection amount monitoring device for a solid-liquid separator characterized by comprising: .