JP5681863B2 - Clogging detection device for cooling tank - Google Patents

Description

  The present invention relates to a clogging detection device for a cooling tank in which a cooling device installed in a power plant detects clogging due to adhered substances.

  Conventionally, as a cooling device in a power plant, as shown in FIGS. 3 and 4, an inlet 2 and an outlet 3 of cooling water are attached to the end of the cooling tank 1, and the vicinity of the inlet 2 of the cooling tank 1. The tube plate 4 is fixed to the tube plate 5, the tube plate 5 is fixed to the vicinity of the outlet 3, the tube plates 4 and 5 are formed with a plurality of holes, and the ends of the plurality of cooler tubes 6 are inserted into these holes. The observation window 7 is formed in the cooling tank 1 near the inlet 2, and the inlet 8 through which the cooled liquid flows and the outlet 9 from which the cooled liquid flows out are fixed to the side surface of the cooling tank 1. Has been.

In the cooling tank 1 configured in this way, as shown in FIG. 5, when the inlet 6a of the cooler pipe 6 is viewed from the partition plate 4, the inside of the cooler pipe 6 can be seen. As shown in FIG. 6, adhering organisms and mud floating in the cooling water adhere to the inlet 6 a of the cooler pipe 6 and the inside of the cooler pipe 6. There is a problem that the inlet 6a is blocked, the flow rate of the cooling water is lowered, the cooling effect is deteriorated, the cooling pipe 6 is leaked, and the cooling cannot be performed, and it is necessary to detect the state where the cooling cannot be performed. There was a problem that there was. Also, if mud or adhering organisms adhere to the cooler pipe path, the load of the intake pump will increase due to the increase in fluid resistance, cooling efficiency will decrease, and damage such as blockage of the cooler pipe will occur. However, there is a problem that there is no method for confirming the degree of dirt inside the cooler, and it is impossible to grasp the exact cleaning timing.
Japanese Patent Laid-Open No. 9-178373

The problem to be solved is that in the conventional cooling device, adhering organisms and mud floating in the cooling water adhere to the side wall, the inlet 6a of the cooler pipe 6 and the inside of the cooler pipe 6, and the cooler pipe There is a problem that the inlet 6a of the No. 6 is blocked, the flow rate of the cooling water decreases, and cooling cannot be performed, and it is necessary to detect a state in which this cooling cannot be performed.

In the present invention, an ultrasonic vibrator that is attached to a cooling tank and radiates ultrasonic waves toward a tube plate to which one end of a cooling pipe of the cooling tank is fixed, and an oscillation output to the ultrasonic vibrator An oscillation function for transmitting a signal, a reception function for receiving a reception signal from the ultrasonic transducer, a comparison function for inputting a reception signal from the reception function, and a predetermined function for comparison with an input reception signal in the comparison function A threshold signal generating function for generating a threshold signal, and a personal computer comprising an alarm signal generating function generated by a signal output from the comparison function when the received signal becomes larger than the threshold signal, and the receiving function When the received signal is larger than the threshold signal, the comparison function compares the received signal from the threshold signal from the threshold signal generating function with the comparison function. The alarm signal is generated from the alarm signal generation function to notify that the cooler tube is clogged by the comparison signal output from the function, and is input from the temperature sensor to the comparison function. Further, the cooling tank has a temperature correction function based on temperature information, and the cooling tank is fixed to both ends of a plurality of cooler tubes that are substantially parallel to a tube plate that is mounted with a space therebetween. A coolant flowing in from the inlet of one end of the cooler tube flows through the cooler tube, and a liquid inflow tube on the side so that the cooled liquid passes between the cooler tubes. A liquid outflow tube is attached to the opposing portion, and ultrasonic waves are emitted from the ultrasonic transducer toward a tube plate to which one ends of the plurality of cooler tubes are fixed. .

In the clogging detection device of the cooling tank of the present invention, cooling instrumentation 置又 is fitted with ultrasonic transducers in the window except by applying an oscillating signal to the ultrasonic transducer by the oscillation function of the personal computer, the ultrasonic vibrator When the reflected wave of the irradiated ultrasonic wave is irradiated toward the tube plate, the reflected wave does not clog the cooler tube because there is no reflected wave from the hole of the cooler tube of the tube plate. Since detection increases and the reflected wave signal becomes stronger, clogging increases, and if the reflected signal becomes stronger with a predetermined threshold, there is an advantage that it can be notified by an alarm or the like.

In the present invention, the surface of the cooling tank or cooler tube which is secured to the tube sheet was irradiated with ultrasonic waves from the ultrasonic transducer receives the reflected waves at the receiving functions of a personal computer, comparing the received signal The function is sequentially compared with a threshold signal determined in advance by the function, and an alarm is given when the received signal becomes stronger than the threshold signal determined in advance.

  FIG. 1 is a configuration diagram of a cooling tank clogging detection apparatus according to an embodiment of the present invention. Reference numeral 1 denotes a cooling tank, and an ultrasonic transducer 10 is mounted on a side wall 1a inside the cooling tank 1 and faces the opposite side wall. The ultrasonic transducer 10 is connected to the oscillation function 11a and the reception function 11b of the personal computer 11, the reception function 11b is connected to the comparison function 11c, and the comparison function 11c is connected to the threshold signal generation function 11d. A threshold signal is input, and an alarm signal generation function 11e is connected to the output side of the comparison function 11c.

In the clogging detection device of the cooling apparatus of the present embodiment configured as described above, a transmission output is sent from the oscillation function 11a of the personal computer 11 to the ultrasonic vibrator 10 mounted on the side wall 1a of the cooling tank 1 at regular intervals. When applied, ultrasonic waves are radiated from the ultrasonic transducer 10 toward the opposing wall 1b, but the reflected waves remain as they are if no adhering organisms or mud floating in the cooling water is deposited. Since the signal is returned to the ultrasonic transducer 10, there is no change in the received signal. However, if adhering organisms or mud floating in the cooling water accumulates on the opposing wall surface 1b of the ultrasonic transducer 10, the ultrasonic transducer 10 and the opposing wall surface When the reflected wave of the ultrasonic wave becomes strong because the interval with 1b becomes narrow, it is received by the reception function 11b of the personal computer 11, and compared with the threshold signal from the threshold signal generation function 11d by the comparison function 11c. More, the reception of the reception signal becomes higher than the threshold signal, outputs it the signal from the comparison function 11c, an alarm signal is generated from the alarm signal generation function in this signal, alarm buzzer, etc. In this alarm signal is generated To do.

  As described above, the present invention has an advantage that it is possible to detect non-contacting ultrasonic waves on the wall surface of the cooling tank 1 by accumulating living organisms or mud floating in the cooling water.

  FIG. 2 is a block diagram of a cooling tank clogging detection apparatus according to another embodiment of the present invention. Reference numeral 1 denotes a cooling tank, 4 denotes a tube plate, 6a denotes an inlet of the cooler pipe 6, and 7 denotes a viewing window. However, in this embodiment, the ultrasonic transducer 10 is attached in contact with the observation window 7, and the ultrasonic transducer 10 is connected to the personal computer 11. Connected to the oscillation function 11a and the reception function 11b, the reception function 11b is connected to the comparison function 11c, a threshold signal is input from the threshold signal generation function 11d to the comparison function 11c, and an alarm signal is generated on the output side of the comparison function 11c Function 11e is connected.

In the clogging detection apparatus of the cooling apparatus of the present embodiment configured as described above, the ultrasonic vibrator 10 mounted in contact with the observation window 7 of the cooling tank 1 is connected to the ultrasonic vibrator 10 from the oscillation function 11a of the personal computer 11 at regular intervals. Callers output is applied, an ultrasonic from ultrasonic transducer 10 is radiated toward the tube sheet 4, as shown in FIG. 5, clogging the condenser tubes 6 fixed to the tube plate 4 Otherwise, the ultrasonic wave is reflected from the tube plate 4, but the inlet 6a of the cooler tube 6 is a hole, and the reflected wave is deviated and does not return to the ultrasonic transducer 10, so that the ultrasonic wave is received. Since the quantity is small and thus the received ultrasonic waves are input to the reception function 11c and the intensity is lower than the threshold signal from the threshold signal generator 11d, no alarm signal is generated from the comparison function 11c.

Here, when the time is clogged end 6a of the cooler tube 6 that is secured to the tube sheet 4 as shown in FIG. 6 occurs through, ultrasonic waves radiated from the ultrasonic transducer 10 is tubesheet 5 Since the reflected signal from the inlet 6a of the cooler tube 6 becomes stronger, the received signal is received by the receiving function 11b of the personal computer 11 and compared with the threshold signal from the threshold signal generating function 11d by the comparing function 11c . by reception amount is increased, the output signal from the comparison function 11c, thereby generating the alarm signal from the alarm signal generating function, alarm is generated from buzzer in this alarm signal.

In the present invention, the clogging of the cooler tube 6 whose one end is fixed to the tube plate 4 of the cooling tank 1 is thus detected in a non-contact manner by the ultrasonic wave from the ultrasonic vibrator 10 attached to the observation window 7. There is an advantage that you can.

In the above embodiment, the comparison function 11c of the personal computer 11 may have a temperature correction function based on temperature information input from the temperature sensor, and clogging of a large number of cooler tubes 6 in the cooling tank 1 may be performed. Although configured to detect, it can also be used in other cooling devices provided with a thin tube.

It is a block diagram of the clogging detection apparatus of the cooling tank of the Example of this invention. It is a block diagram of the clogging detection apparatus of the cooling tank of the Example of this invention. It is side surface sectional drawing of the conventional cooling tank. It is sectional drawing of the cooling tank of FIG. It is a top view of a part of tube plate of the cooling tank of FIG. It is a top view of a part of clogged tube sheet of the cooling tank of FIG.

DESCRIPTION OF SYMBOLS 1 Cooling tank 2 Inflow port 3 Outlet port 4, 5 Tube plate 6 Cooler tube 7 Peep window 8 Inlet port 9 Outlet port 10 Ultrasonic vibrator 11 Personal computer

Claims (3)

An ultrasonic vibrator mounted on a cooling tank and adapted to irradiate ultrasonic waves toward a tube plate to which one end of a cooling pipe of the cooling tank is fixed, and an oscillation for transmitting an oscillation output to the ultrasonic vibrator Function, a reception function for receiving a reception signal from the ultrasonic transducer, a comparison function for inputting a reception signal from the reception function, and a predetermined threshold signal to be compared with the input reception signal in the comparison function A threshold signal generating function that is generated, and a personal computer having an alarm signal generating function that is generated by a signal output from the comparison function when the received signal is larger than the threshold signal. And the threshold signal from the threshold signal generation function are compared by the comparison function, and when the received signal becomes larger than the threshold signal, the comparison function outputs The comparison signal, and generates an alarm signal from said alarm signal generating function, the clogging detection device of the cooling tank cooler tube is characterized in that informs that clogged.   2. The cooling tank clogging detection apparatus according to claim 1, wherein the comparison function has a temperature correction function based on temperature information input from a temperature sensor. The cooling tank is fixed to both ends of a plurality of cooler tubes that are substantially parallel to a tube plate that is mounted at an interval in the interior thereof, and the coolant that flows in from the inlet of one end of the cooler tube is supplied to the cooler. A liquid inflow tube is attached to the side surface and a liquid outflow tube is attached to the opposite side so that the liquid to be cooled flows between the cooler tubes, and one end of the plurality of cooler tubes clogging detecting device of the cooling tank according to claim 1 or 2, wherein it has to be irradiated with ultrasonic waves from said ultrasonic transducer toward the anchored tube sheet.

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