JPH03113200A - Transferring device by use of ejector - Google Patents

Abstract

PURPOSE:To make it possible to detect jam toward a piping and the like before complete blockade soad to take a countermeasure for removing the jam by installing an ejector, a drive liquid supply line connected thereto, a flow rate detector provided on the supply line, and an indicator connected thereto. CONSTITUTION:Radioactive slurry 12 is transfered to a receiving tank 14 from a supply tank 13 through a delivery line 4 with force of drive liquid 11 supplied to an ejector 1. Here, if partial jam X is generated in the delivery line 4, pressure loss in the delivery line 4 is increased, the drive liquid 11 supplied under low pressure becomes hard to flow, and flow lowering of the drive liquid 11 is caused. This flow lowering is detected by a flow rate detector 5, and indication of generated jam is output from an indicator 7. It is possible thereby to detect jamming tendency of the piping, and to take measures before blockage occurs.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides an ejector configured to detect clogging of piping, etc., which occurs when, for example, a fluid containing a radioactive substance is transferred by the ejector. relating to a transfer device.

(Prior Art) As means for transferring fluids such as slurry containing radioactive substances, it is common to use pumps suitable for each fluid depending on its properties. For example, when transferring fluids containing large amounts of radioactivity, fluid transfer devices such as air lifts, siphons, or ejectors are often used. Compared to mechanical pumps, these fluid transfer devices have no moving parts, so they are less likely to break down and are easier to maintain. However, on the other hand, they are inferior in functions such as flow rate adjustment, and discharge pressure etc. are lower in transfer lines that handle highly radioactive fluids. If changes,
The pressure cannot be easily detected.

(Problems to be Solved by the Invention) When radioactive slurry is transferred by an ejector, it is conceivable that the slurry may clog and block the pipes. Also, when filtering the slurry,
The filter also becomes clogged. However, there is no known appropriate means for detecting clogging that gradually occurs in ejectors that transport radioactive fluids.

Therefore, it is conceivable to provide a differential pressure gauge in the transfer line incorporating the ejector to detect an increase in differential pressure due to blockage of piping or the like. However, when handling highly radioactive slurry, using an ejector without moving parts instead of a mechanical pump has the problem that fluctuations in discharge pressure, etc. cannot be easily detected, as described above.

The present invention has been made to solve the above problems, and is a measure for detecting and removing clogging in piping, etc., which occurs when, for example, radioactive slurry is transferred by an ejector, before it becomes completely blocked. An object of the present invention is to provide a transfer device using an ejector that can take a load.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes an ejector, a driving fluid supply line connected to the ejector, a flow rate detector provided in the supply line, and a flow rate detector provided in the flow rate detector. It is characterized by comprising a connected indicator.

(Function) The flow rate of the driving fluid such as air or steam supplied to the ejector is monitored by a flow rate detector installed in a non-radiation environment, for example, and the setting is made to detect a decrease in the flow rate and issue an instruction.

When partial clogging occurs on the discharge line side, it becomes difficult for the driving fluid to flow. Therefore, the flow rate of the driving fluid that is supplied at a constant pressure decreases. By detecting a decrease in the flow rate of the driving fluid caused by this clogging, it is possible to know the tendency of clogging of the piping. This makes it possible to detect a complete blockage in the discharge line and take measures to remove the blockage.

(Embodiment) An embodiment of a transfer device using an ejector according to the present invention will be described with reference to FIGS. 1 to 3.

Figure 1 shows the basic configuration and principle of the present invention.
Specific examples and functional water are shown in Fig. 3 and Fig. 3.

In FIG. 1, reference numeral 1 indicates an ejector, and this ejector 1 is connected to a supply line 2 for a driving fluid, a suction line 3 for a liquid supply, for example, a radioactive slurry, and a discharge line 4 for discharging the driving fluid and the supply liquid. ing. A flow rate detector 5 and a valve 6 are connected to the supply line 2, and a signal from the flow rate detector 5 is input to an indicator 7.

In addition, the dashed-dotted line in the figure indicates the radiation shielding barrier 8,
The right side of barrier 8 is the radiation environment 9 in the area where highly radioactive fluids are handled.
The left side shows a non-radioactive environment 10 in an area where radioactive materials are not handled. Therefore, ejector 1. The suction line 3 and the discharge line 4 are connected to the radiation environment 9, and the supply line 2. Flow rate detector5. The valve 6 and the indicator 7 are each arranged in a non-radiation environment 10.

Here, when the valve 6 is opened and a constant pressure driving fluid 11 is supplied to the ejector 1 through the supply line 2, a supply liquid (not shown) is sucked through the suction line 3 and flows together with the driving fluid 11 into the ejection line 4 side. If the piping on the discharge line 4 side becomes clogged for some reason,
The flow rate is monitored by the flow rate detector 5 and the driving fluid 11
A decrease in the flow rate is detected and an instruction is issued from the indicator 7.

By detecting a decrease in flow rate in this manner, it is possible to detect a tendency for partial clogging of the piping before a complete blockage occurs.

FIG. 2 shows a specific embodiment based on the principle shown in FIG. 1 above.

That is, in FIG. 2, a supply tank 13 storing radioactive slurry as a supply liquid is connected to the suction line 3,
A receiving tank 14 is connected to the downstream side of the discharge line 4.

The rest of the structure is the same as in Figure 1, so
Description of other structures will be omitted.

Here, the radioactive slurry 12 in the supply tank 13 is sucked by the force of the driving fluid 11 supplied to the ejector 1 through the supply line 2, and this slurry 12 is transferred to the suction line 3. Ejector 1. Passes through the discharge line 4 and enters the receiving tank 1
Transferred to 4.

Note that the driving fluid 11 is supplied to the supply line 2 at low pressure and flows from the non-radiation environment 10 to the radiation environment. The flow rate of the driving fluid 11 is measured by a flow rate detector 5 and a signal is sent to an indicator 7, and fluctuations in the flow rate are outputted from the indicator 7.

Next, the operation of the above embodiment will be explained with reference to FIG.

The driving fluid 11 supplied to the ejector 1 as described above
The radioactive slurry 12 is transferred from the supply tank 13 through the discharge line 4 to the receiving tank 14 by the force of .

Here, as shown in FIG. 3, if (I) partial clogging X occurs in the discharge line 4, (II) the pressure loss in the discharge line 4 increases, and (III) the drive being supplied with low pressure The fluid 11 becomes difficult to flow, causing a decrease in the flow rate of the driving fluid 11. This decrease in flow rate is detected by the flow rate detector 5, and (IV) an indication that clogging has occurred is outputted from the indicator 7. This makes it possible to detect the tendency for pipes to become clogged and take action before blockages occur.

Therefore, in the radiation environment 9 for boat fishing, the use of valves that are easily blocked due to difficult maintenance is restricted or prohibited; however, according to this embodiment, the flow rate detector 5 of the driving fluid 11 is Since it can be installed in a non-radioactive environment 10, there are no restrictions on equipment selection from a maintenance standpoint.

Therefore, any suitable method can be used to measure the flow rate of the driving fluid 11.

FIG. 4 shows another embodiment of the present invention, in which a filter 15 is provided in the discharge line 4. Note that the other parts are the same as those in the above embodiment, so the explanation thereof will be omitted.

That is, in this embodiment, the radioactive slurry 12 in the supply tank 13 is sucked by the force of the driving fluid 11 supplied to the ejector 1 through the supply line 2, and this slurry 12 flows through the suction line 3, the ejector 1. It passes through the filter 15 and is transferred to the receiving tank 14. Here, the driving fluid 11 is supplied at a constant pressure. A flow rate detector 5 that measures the flow rate of the driving fluid 11 sends a signal to an indicator 7, and the indicator 7 outputs a fluctuation in the flow rate. Here, when the differential pressure increases due to the slurry 12 collected by the filter 15,
The driving fluid 11 becomes difficult to flow. Since the driving fluid 11 is supplied from the supply line 2 at a constant pressure, the differential pressure generated in the filter 15 increases the pressure loss, and the driving fluid 11
This causes a decrease in flow rate of 1. By detecting this flow rate drop with the flow rate detector 5, the tendency of clogging of the piping is detected.
You can take action before a blockage occurs.

Note that if filtration progresses and the differential pressure of the filter 15 is left to rise, it will eventually become clogged. If the filter 15 itself becomes clogged, its function can be restored by replacing the filter element, but it is important from an operational management point of view to know the collection status of the filter 15 (specifically, the increase in differential pressure) and to set the timing for replacement. It is. Even in such a situation, measuring the differential pressure of the filter 15 by installing a differential pressure gauge on the filter 15 is severely restricted due to the freedom of maintenance in the radiation environment 9. Therefore, as shown in FIG. 4, a flow rate sensor 5 for the driving fluid 11 is installed in the non-radiation environment 10 to monitor the differential pressure across the filter 15 and replace the filter element at an appropriate time.

[Effects of the Invention] According to the present invention, the flow rate of the driving fluid supplied to the ejector is monitored with a flow rate detector installed in a non-radiation environment, and by detecting a decrease in the flow rate, the tendency of partial clogging of piping is detected. can be detected before a complete blockage occurs. Therefore, it is possible to take measures for removing clogging (passing the cleaning liquid or decontamination liquid) with sufficient margin, and the operation management of the plant including ejector transfer becomes easy.

Furthermore, since maintenance is difficult in a high radiation environment, the use of valves and the like that are prone to blockage is restricted or prohibited. Since it can be installed in a non-radiation environment, there are no restrictions on equipment selection from a maintenance perspective. Therefore, any suitable method can be used to measure the flow rate of the driving fluid.

[Brief explanation of drawings]

Figures 1 to 3 are for explaining one embodiment of the ejector-based transfer device according to the present invention. Figure 1 is a system diagram showing the principle, Figure 2 is a device layout diagram, and Figure 3 is an operational diagram. FIG. 4 is a system diagram showing another embodiment of the present invention. 1... Ejector 2... Supply line 3... Suction line 4... Discharge line 5... Flow rate detection needle 6... Valve 7... Indicator 8... Barrier 9... Radiation environment 10...Non-radiation environment 11...Driving fluid 12...Radioactive slurry 13...Supply tank 14...Receiving tank 15...Filter (8733)

Claims (1)

[Claims] Transfer by an ejector characterized by comprising an ejector, a driving fluid supply line connected to the ejector, a flow rate detector provided on the supply line, and an indicator connected to the flow rate detector. Device.