JPS63214388A - Waste liquid transfer apparatus - Google Patents

Abstract

PURPOSE:To prevent the output of an unnecessary abnormal alarm, by in hibiting outputting of an abnormality signal from a sump pump operation monitoring means or a sump pump operation interval monitoring means as long as a waste liquid transfer signal is not sent from a waste liquid transfer monitoring means. CONSTITUTION:A waste liquid 4 flows in a sump 3 through an overflow pipe 2 and, when the temp. of the waste liquid 4 is higher than a preset value, a temp. detector 15 is operated to operate a sump pump interlock 17 through a switch 16. By this mechanism, a valve opening signal is outputted to an inlet valve 11 and a start signal is outputted to a sump pump 5. Then, the inlet valve 11 is opened and the pump 5 is started; the waste liquid 4 in the sump 3 is recirculated through transfer piping 6, the inlet valve 11, recirculation piping 9 and a heat exchanger 10 and continuously recirculated until the temp. of the waste liquid is lowered to a prescribed value or less. By this method, plant operating efficiency can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a waste liquid transfer device, and particularly to one that does not unnecessarily output a sump inflow abnormality signal.

(Prior Art) For example, a waste liquid transfer device in a nuclear power plant has a general configuration as follows. First, waste liquid is stored in a storage tank, and the waste liquid that overflows the storage tank flows into the sump via an overflow line. The liquid level of the waste liquid in the sump is detected by a liquid level detector, and when the liquid level reaches a preset regulation i or higher, a level switch connected to the liquid level detector is activated to start the sump pump.

By activating the sump pump, waste liquid in the sump is transferred to a waiting tank via a transfer line.

In the above configuration, for example, when the flow rate of waste liquid flowing into the sump is abnormally large, the sump pump is started frequently and its operating time becomes long. If the start time of the sump pump (continuous operation time) exceeds a certain time, or if the start interval of the sump pump becomes less than a certain time, the flow rate of waste fluid flowing into the sump is considered abnormal and the sump is stopped. The inflow abnormality detection circuit (ANN circuit) is activated and outputs a sump inflow abnormality alarm.

The above alarm output will be explained with reference to FIG. In FIG. 4, reference numeral 101 is a sump pump starting time abnormality detector, and reference numeral 102 is a sump pump starting interval abnormality detector. The abnormality detection signal 5101 from the sump pump startup time abnormality detector 101 and the abnormality detection signal 5102 from the sump pump startup interval abnormality detector 102 are output to the OR circuit 103.
is input. If any of the above abnormality detection signals is input, a signal 5103 is output from the OR circuit 103, and a sump inflow abnormality alarm is output (reference numeral 104 in the figure).
).

The above configuration has the following problems. That is, a waste liquid circulation line is disposed between the transfer line and the sump, and for example, when the waste liquid flowing into the sump is high temperature, the waste liquid is circulated through the circulation line, and in this case, the waste liquid is circulated through the circulation line. The waste liquid is cooled by an inserted cooling equipment such as a heat exchanger. During such waste liquid circulation operation, the sump pump is started, but since the sump pump continues to start as long as the temperature of the waste liquid is above a certain value, the sump inflow abnormality detection circuit is activated.
There was a problem in that the sump pump inflow abnormality alarm was output even though the circulation operation was in progress to lower the temperature of the waste liquid.

(Problems to be Solved by the Invention) In this conventional configuration, a sump flow rate error alarm is output even though circulation operation is in progress to lower the waste liquid temperature. In view of this problem, the present invention has been made and an object of the present invention is to provide a waste liquid transfer device that can prevent the output of unnecessary sump inflow abnormality alarms.

[Structure of the Invention] (Means for Solving Problems) That is, the waste liquid transfer device according to the present invention includes a storage tank for storing waste liquid in a plant, a sump for introducing the waste liquid that overflows the storage tank, and a sump for introducing the waste liquid that overflows the storage tank. a sump pump that transfers the waste liquid in the tank to a receiving tank via a transfer line with a transfer valve inserted therein; a waste liquid circulation line with an inlet valve inserted between the transfer line and the sump; and the sump pump. sump pump start time monitoring means for monitoring the continuous operation time of the sump pump and outputting a sump pump start time abnormal signal when the operation time exceeds a predetermined time; a sump pump start interval monitoring means for outputting a sump pump start interval abnormality signal when the interval becomes shorter than the specified time; When an abnormal signal is input from the waste liquid transfer operation monitoring means and from the sump pump start time monitoring means or the sump pump start interval monitoring means, and an empty signal is input to the waste liquid transfer operation monitoring means. The apparatus is characterized in that the apparatus further comprises a sump inflow amount abnormality monitoring means for outputting a sump inflow amount abnormality signal.

(Function) In other words, even if an abnormal signal is output from the sump pump start time monitoring means or the sump pump start interval monitoring means, at the same time a signal indicating that the waste liquid transfer operation is being performed from the waste liquid transfer operation monitoring means is output. Unless it is output, the sump inflow amount abnormal signal is not output.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a system diagram showing the configuration of the waste liquid transfer device, and reference numeral 1 in the figure is a storage tank. A sump 3 is connected to the storage tank 1 via an overflow pipe 2, and waste liquid overflowing from the storage tank 1 flows into the sump 3. Figure @4 is waste liquid. Two sump pumps 5 are installed in the sump 3, and the waste liquid 4 in the sump 3 is transferred to a receiving tank 7 via a transfer pipe 6 by the sump pumps 5.

A transfer valve 8 is inserted into the transfer pipe 6.

The high-temperature waste liquid 4 is transferred to the heat exchanger 10 via a circulation pipe 9 branched to the transfer pipe 6, cooled there, and then returned to the sump 3 via the circulation pipe 9. A large mouth valve 11 is inserted into the circulation pipe 9.

A liquid level detector 12 is attached to the sump 3,
The liquid level detector 12 detects the liquid level of the waste liquid 4 in the sump 3, and a signal is outputted to the sump pump interlock (I) 14 via the level switch 13. A temperature detector 15 is attached to the sump 3. The temperature detector 15 detects the temperature of the waste liquid 4 in the sump 3, and sends a signal to the sump pump interlock (II) 17 via the temperature switch 16. is output.

Reference numeral 18 in the figure is a sump inflow abnormality detection device, and this sump inflow abnormality detection device 18 detects the inflow of waste liquid 4 into the sump 3 based on the operating status of the sump pump 5 and the opening/closing status of the transfer valve 8. It determines whether there is an abnormality and outputs a sump inflow abnormality alarm as appropriate. This will be explained below with reference to FIG.

The sump pump starting time abnormality detector 21 in FIG. It outputs the abnormal signal S21 to the OR circuit 23. Further, reference numeral 22 is a sump pump starting interval abnormality detector, and this sump pump starting interval abnormality detector 22 monitors the starting interval of the sump pump 5, and when the starting interval of the sump pump 5 falls below a preset value, the sump pump starting interval abnormality detector 22 detects the sump pump starting interval abnormality. It outputs the abnormal signal s22 to the OR circuit 23. The OR circuit 23 outputs a signal s23 to the AND circuit 24 when any abnormal signal is input. When the AND circuit 24 receives both this signal s23 and the transfer valve open signal s25 from the transfer valve open detector 25, it outputs a signal 824, thereby outputting the sump inflow abnormality alarm 26. In other words, the fact that the transfer valve 8 is open means that the waste liquid transfer operation is being performed.
Therefore, the sump inflow abnormality alarm 26 is output only when the waste liquid transfer operation is being performed.

The operation will be explained based on the above configuration.

(1) First, the waste liquid 4 overflowing from the storage tank 1 flows into the sump 3 via the overflow pipe 2.

At this time, if the temperature of the waste liquid 4 is higher than a preset specified value, the temperature detector 15 is activated and the sump pump interlock (II) 17 is activated via the temperature switch 16. Due to this operation, a valve opening signal is output to the inlet valve 11, and a start signal is output to the sump pump 5.

As a result, the large mouth valve 11 is opened and the sump pump 5 is started, and the waste liquid 4 in the sump 3 is transferred to the transfer pipe 6. Oguchi valve 11. Circulation piping9. The waste liquid is circulated through the heat exchanger 10, and this circulation operation is continued until the waste liquid temperature falls below a specified value.

(2) Next, when the liquid level of the waste liquid 4 in the sump 3 is higher than the specified value, the liquid level detector 12 is activated and the sump pump interlock (I) 14 is activated via the level switch 13. As a result, a valve opening signal is output to the transfer valve 8 and a start signal is output to the sump pump 5. The waste liquid 4 in the sump 3 is sucked into the sump pump 5 and transferred to the transfer pipe 6.
It is transferred into the receiving tank 7 via the . This continues until the liquid level in the sump 3 falls below the specified value.

■Furthermore, regarding the output of the sump inflow abnormality alarm 26, the abnormality signal s21 or signal S22 from the sump pump start time abnormality detector 21 or the sump pump start interval abnormality detector 22 is output, and the transfer valve open signal S25 is output. Only when it is output, the sump inflow 1 abnormality alarm 26 is output. In other words, when the temperature of the waste liquid 4 is abnormal to the specified value and the above-mentioned circulation operation is being performed, the sump inflow amount abnormality alarm 26 is not outputted.

According to this embodiment, the following effects can be achieved.

(1) First, it is possible to effectively prevent unnecessary output of the sump inflow abnormality alarm 26, which has been a concern in the past. In other words, when the temperature of the waste liquid 4 in the sump 3 becomes high, the waste liquid circulation operation is performed, and even if the starting time of the sump pump 5 becomes longer or the starting interval becomes shorter, there is no flow to the receiving tank 7. If the waste liquid transfer is not performed, the transfer valve open signal s25 will not be output, and therefore the sump inflow abnormality alarm 26 will not be output. Therefore, it is possible to eliminate unnecessary alarm output, which has been a problem in the past, and it is possible to prevent erroneous judgments by workers and improve the operating rate of the plant.

■It can also be realized without making major improvements to existing equipment.

Next, a second embodiment will be described with reference to FIG.

This embodiment incorporates a large opening valve close detector 27 for detecting that the large opening valve 11 is closed in place of the transfer valve open detector 25 in the first embodiment, and the other configuration is the same as that described above. This is similar to the first embodiment. Note that the fact that the inlet valve 11 is closed means that a transfer operation is being performed instead of a circulation operation.

In this embodiment, even if the abnormal signal S21 or s22 is output from the sump pump start time abnormality detector 21 or the sump pump start interval abnormality detector 22, the large mouth valve close signal S27 is output from the large mouth valve close detector 27. If it is not output, the sump inflow abnormality alarm 26 will not be output, and therefore, as in the case of the first embodiment, unnecessary alarm output can be effectively prevented.

[Effects of the Invention] As detailed above, according to the waste liquid transfer device according to the present invention, it is possible to effectively prevent the output of unnecessary alarms,
The effects are great, such as preventing operators from making erroneous judgments and improving the plant's operating rate.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are diagrams showing a first embodiment of the present invention,
FIG. 1 is a system diagram showing a schematic configuration of a waste liquid transfer device, FIG. 2 is a diagram showing a configuration of a sump inflow abnormality detection device, and FIG. 3 is a configuration of a sump inflow abnormality detection device showing a second embodiment. FIG. 4 is a diagram showing the configuration of a conventional sump inflow amount abnormality detection device. 1... Storage tank, 3... Sump, 4... Waste liquid,
5... Sump pump, 6... Transfer piping, 7... Receiving tank, 8... Transfer valve, 9... Circulation piping, 11...
・Inlet valve, 18...Sump inflow abnormality detection device, 21
... Sump pump start time abnormality detector, 22 ... Sump pump start interval abnormality detector, 23 ... OR circuit,
24...AND circuit, 25...Transfer valve open detector, 2
6...Sump inflow abnormality alarm.

Claims (3)

[Claims] (1) A storage tank that stores waste liquid in the plant, a sump that introduces waste liquid that overflows this storage tank, and a sump that transfers the waste liquid in this sump to a receiving tank via a transfer line with a transfer valve inserted. The continuous operation time of the pump, the waste liquid circulation line installed between the transfer line and the sump, and an inlet valve inserted therein, and the sump pump are monitored, and if the operation time exceeds a predetermined time, the sump pump is activated. a sump pump start time monitoring means for outputting a start time abnormal signal; and a sump pump start interval monitor for monitoring the operation interval of the sump pump and outputting a sump pump start interval abnormal signal when the operation interval becomes less than a predetermined time. means, waste liquid transfer operation monitoring means for monitoring whether or not waste liquid is being transferred to the receiving tank by the sump pump and outputting a signal when the waste liquid is being transferred; and monitoring means for monitoring the start time of the sump pump. sump inflow rate abnormality monitoring means for outputting a sump inflow rate abnormality signal when an abnormal signal from the means or the sump pump start interval monitoring means is inputted and an empty signal is inputted to the waste liquid transfer operation monitoring means. Characteristic waste liquid transfer device. (2) The waste liquid transfer operation monitoring means monitors the opening and closing of the transfer valve, and outputs a signal indicating that the waste liquid transfer operation is being performed when the transfer valve is opened. A waste liquid transfer device according to claim 1. (3) The waste liquid transfer operation monitoring means monitors the opening and closing of the inlet valve, and outputs a signal indicating that the waste liquid transfer operation is being performed when the inlet valve is closed. A waste liquid transfer device according to claim 1.