JPS63116762A - Control apparatus for clad separator - Google Patents

Abstract

PURPOSE:To prevent the damage of a clad separator at the time of urgent stoppage, by urgently stopping the clad separator when the vibration value of said separator reaches a predetermined value and allowing the injection flow rate of a treatment liquid to correspond to the number of rotations of the separator. CONSTITUTION:The vibration value of a clad separator 1 is detected by a vibration detector 10. When the vibration value detected exceeds a definite preset value, an urgent stoppage signal output means 13 outputs an urgent stoppage signal S4 and the separator 1 gradually lowers in the number of rotations in order to stop urgently. At this time, the injection quantity of the treatment liquid to be injected in the clad separator 1 is adjusted to the quantity corresponding to the number of rotations of the separator 1 lowered by a flow rate control circuit 12. Therefore, the interior of the separator 1 becomes filled with a proper amount of the treatment liquid before reaching stoppage and the separator 1 is rapidly stopped without deteriorating wt. balance.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a clad separator control device, and in particular,
The present invention relates to a clad separator control device suitable for controlling a clad separator used in a radioactive waste treatment system of a nuclear facility.

(Prior Art) A clad separator device is used in an atomic couplant, for example, a radioactive waste treatment system of a nuclear power plant, to effectively remove and reduce the volume of clad from various drain waste liquids and recycled waste liquids. The above-mentioned crud separator device injects a processing liquid containing crud from the inlet, rotates the separator mechanism with a drive motor, causes the crud to precipitate and accumulate, and discharges the clarified liquid from the outlet. This is a device that discharges working water by injecting it and stores it in a cladding receiving tank.

In this clad separator device, the clad, which should originally be deposited and accumulated evenly throughout the separator, sometimes accumulates unevenly. In that case, the vibration of the clad separator increases. When the vibration value reaches a certain value or more, it is necessary to make an emergency stop to prevent the clad separator from being destroyed. Conventional emergency stop control for clad separator equipment is a system that stops the clad separator drive motor in response to a clad separator stop command, and quickly closes the large mouth valve to stop the supply of processing liquid to the clad separator. There is.

(Problems to be Solved by the Invention) In the conventional clad separator control device, when the vibration value of the clad separator reaches a certain level,
When the drive motor is stopped, the injection of the processing liquid is stopped by the sudden closing of the large mouth valve, and the processing liquid inside the clad separator is discharged to the outside by centrifugal force until the rotation becomes extremely low, so that it rapidly disappears.

As a result, the weight balance within the clad separator is extremely influenced by the uneven cladding, and
Higher vibration values can be reached.

In addition, the stopping time is prolonged due to inertia, and there is a risk that the clad separator may be damaged in some cases until the clad separator comes to a complete stop.

An object of the present invention is to provide a clad separator control device that can safely stop a clad separator in a short time without causing damage even when the clad separator is stopped in an emergency.

[Structure of the invention]

(Means for Solving Problems) A control device of the present invention is a control device for controlling a clad separator that separates a cladding from a processing liquid containing the cladding, and includes a vibration detector for detecting a vibration value of the cladding separator, and a vibration detector for detecting a vibration value of the cladding separator. Emergency stop 1-signal output means for outputting an emergency stop signal for emergency stopping the clad separator when the vibration value detected by the vibration detector reaches a predetermined constant value, and the emergency stop signal is output. and a flow rate control means for later controlling the flow rate of the treatment liquid injected into the clad separator to an amount appropriate to the rotational speed of the clad separator.

(Function) The vibration value of the clad separator is detected by a vibration detector. When the detected vibration value exceeds a predetermined constant value, the emergency stop signal output means outputs an emergency stop signal. This signal causes the clad separator to gradually reduce its rotation speed in order to make an emergency stop. The amount of processing liquid to be injected into the clad separator is adjusted by the flow rate control means in accordance with the aforementioned decreasing rotational speed. This results in
The inside of the clad separator is filled with the processing liquid in an appropriate state until it stops, and the weight balance inside the clad separator is not further upset, and due to the resistance of the processing liquid, the clad separator remains in the correct state at the time of an emergency stop. It also does not show high vibration values, does not break, and comes to a quick stop.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, 1 is a clad separator, and the clad separator 1 is equipped with an inlet pipe 2 for injecting the treatment liquid containing the clad, and the inlet pipe 2 is equipped with a large-mouth valve 3 and an orifice 4 whose opening degree can be adjusted. It is set up. In addition, an outlet pipe 5 is provided to the clad separator 1 for discharging the clarified liquid after the clad has already been precipitated inside the clad separator 1.
This piping 5 is provided with an outlet valve 6.

A driving clad separator motor 7 connected to the clad separator 1 rotates a separator mechanism (not shown) in the TARAD separator 1 to separate the clad from the processing liquid.

The clarified water from which the cladding has been separated in this manner is discharged through the outlet pipe 5. Further, the separated cladding is deposited and accumulated on the inner wall of the cladding separator 1.

The control circuit for this clad separator 1 is for performing control based on the principle described below. That is, the processing liquid is supplied so that the amount of inflow is commensurate with the discharge of clear water due to rotation.

Therefore, when the rotation decreases, the discharge volume decreases and the inflow volume must be reduced. Adjust the population valve to ensure that the water is always full until the plant is shut down. The control circuit is composed of a detection system and a control system. The detection system includes a flow meter 8 connected to the orifice 4 of the inlet pipe 2, a rotation speed detector 9 that detects the rotation speed of the clad separator motor, and a vibration detector 10 that detects the vibration of the shaft of the clad separator 1. has. The control system includes a vibration value check circuit 11 and a flow rate control circuit 12. A vibration signal S1 from the vibration detector 10 is input to the vibration value check circuit 11. Here, the vibration value check circuit 11 operates as follows. That is, during normal operation, the vibration signal S is at a constant value V. It is as follows. In that case, the vibration value check circuit 11 determines that the vibration value is normal and issues an operation continuation command S2 to the process control device 13.
Output. Furthermore, when there is an abnormality in the processing operation, that is, when cladding is unevenly accumulated inside the cladding separator 1, the vibration signal S is set to a constant value V. Exceed. In that case, the vibration value check circuit 11 determines that there is an abnormality, and transmits the clad separator motor emergency stop command S3 to the process control device 13 to stop the clad separator motor 7, and also sends the same signal to the flow rate control circuit 12. A stop command S3 is output. The process control device 13 outputs an emergency stop signal S4 to the clad separator motor to stop it urgently, and turns off the power. That is, this process control device 13 functions as an emergency stop signal output means.

As a result, the clad separator motor 7 gradually reduces its rotational speed and eventually stops.

When the clad separator motor emergency stop command S3 is input, the flow rate control circuit 12 receives a motor rotation speed signal S input from the rotation speed detector 9 of the clad separator motor.
After setting the injection processing flow rate of the processing liquid according to No. 5 and comparing it with the flow rate signal S6 inputted from the flow rate detector 8, the appropriate inflow processing ia and the quantity signal are output to the process control device 13. As a result, the process control device 13 outputs the flow rate control signal S8 to the large mouth valve 3, the opening degree of the artificial valve 3 is gradually narrowed down, and at the same time, the rotation speed of the clad separator motor 7 is also reduced, and the clad separator motor 7 stops. That is, the flow rate control circuit 12, the process control device 13, and the inlet valve 3 constitute a flow rate control means. In this way, the appropriate inflow processing flow rate signal S7 and the flow rate control signal S8 can be made into signals proportional to the attenuating motor rotation speed signal S5.

When the cladding separator motor 7 is stopped, the injection process flow is continuously adjusted to match the rotational speed of the attenuated cladding separator motor 7, and the inside of the cladding separator 1 can always be filled with the processing liquid. The separator 1 can be stopped in a short time.

Next, with reference to FIGS. 2A to 2C, the control action by the above-mentioned control device will be described from the time when the clad separator 1 goes from a normal operating state to an abnormal operating state and then stops.

FIG. 2A shows changes in the shaft vibration value of the clad separator motor, FIG. 2B shows changes in the rotational speed of the clad separator motor 7, and FIG. 2C shows changes in the injection flow rate.

During normal operation, if the cladding or cladding separator 1 is accumulated evenly throughout the cladding, the characteristic a shown in figure A
As shown in Fig. 1, the shaft vibration value is almost constant. In this case, the rotational speed of the clad separator motor 7 is also approximately constant, as shown by characteristic b1 in FIG.

Eventually, as the accumulation of cladding becomes uneven, the rotational speed of the clad separator motor 7 becomes irregular, as shown by characteristic b2 in FIG. The shaft vibration value of No. 7 also gradually increases. This shaft vibration value is a constant value V at time t2
When bo is exceeded, the vibration value check circuit 11 transmits the clad separator motor emergency stop command S3 to the process control device 13, as described above. Accordingly, the process control device 13 outputs a signal S4 to stop the clad separator motor 7. As a result, the characteristic b in Figure B
As shown in FIG. 3, the photographing force of the clad separator motor 7 connected to the clad separator 1 is lost, the rotational speed gradually decreases, and it completely stops at time t4. As the rotational speed of the clad separator motor 7 decreases, the shaft vibration value also gradually decreases, as shown by characteristic a3 in FIG.

Next, we will look at the relationship between the rotation speed of the clad separator motor and the flow rate of the treatment liquid injected into the clad separator 1. The above-mentioned clad separator emergency stop command S is
At time t2, the flow rate control circuit 12 is also informed.

As a result, the above-mentioned injection flow rate, which had been a constant value Fo as shown in characteristics C1 and 2 in FIG. It decreases in accordance with the decrease in the rotation speed of the motor 7.

As a result, the inside of the clad separator 1 is always filled with the processing liquid, the weight balance between the processing liquid and the unevenly stacked clad remains unchanged, and the vibration value gradually decreases as the rotational speed decreases. Moreover, at this time, since the processing liquid acts as a brake to absorb the inertial energy of the rotating portion of the clad separator 1, the clad separator motor 7 comes to a stop within a short time (time 14).

〔Effect of the invention〕

As described above, according to the present invention, even when the clad separator is to be stopped in an emergency, it is possible to stop the clad separator in a short time while preventing damage to the clad separator, thereby improving the reliability of the clad separator device as a whole. can be improved.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the device of the present invention, and FIG. 2 shows different characteristic diagrams for explaining control modes by the device. 1... Clad separator, 10... Vibration detector,
S4...Emergency stop signal. Applicant's agent: Sato - Yudokoro 1 Figure ↑2 Pipe 4"BA Ni;)] Flood 2 Figure

Claims (1)

[Scope of Claim] A clad separator control device that controls a clad separator that separates a clad from a processing liquid containing the clad, including a vibration detector that detects a vibration value of the clad separator, and a vibration detected by the vibration detector. emergency stop signal output means for outputting an emergency stop signal for emergency stopping the clad separator when the value reaches a predetermined constant value; and after the emergency stop signal is output, the processing liquid is supplied to the clad separator. A control device for a clad separator, comprising: flow rate control means for controlling the injection flow rate to an amount appropriate to the rotational speed of the clad separator.