JPH0112183Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a device for measuring the content of oil, pollutants, etc. that has entered a liquid, and is used to detect sampling pipes and other related conduits caused by these contaminants. The present invention relates to a measuring device that can reliably wash parts and obtain reliable measurement results.

[Conventional technology] Devices that continuously measure the content of substances mixed in liquids in an ON-LINE manner to prevent environmental pollution include oil concentration meters and oil discharge monitoring and control devices that measure oil content in wastewater discharged from ships. It is also used as an oil concentration meter to measure the oil content in factory wastewater, and a turbidity meter to measure the turbidity in factory wastewater.

In such a measuring device, a part of the liquid to be measured is sucked by a pump through a sampling pipe and sent to the detection unit, and the content of contaminants in the liquid is continuously measured to ensure strict compliance with contamination standards. Recording of measurement results is required. However, the sampling pipes and fittings, valves, etc. installed in the pipelines are contaminated with filth, high viscosity oil, etc. in wastewater such as sewage and residual water from ships or industrial wastewater, and measurements cannot be performed while they are contaminated. When the equipment is stopped, the pipes are blocked by these filth and oils, and the next time the equipment is used, normal operation may be inhibited and measurement may become impossible, or even if the level of contamination of the liquid is small, it may become impossible to make measurements. Accurate measurements cannot be made due to contamination. Therefore, cleaning is an essential condition for such measurements.

[Problems that the invention aims to solve] In conventional equipment, contamination countermeasures and cleaning are mainly aimed at the detection part, and sufficient consideration is not given to the entire system including sampling pipes, fittings, valves, etc. In addition, there was no consideration given to the methods to ensure that cleaning was carried out before and after the measurement, and cleaning errors were caused by forgetting or erroneously performing cleaning operations that depended on the manual opening and closing of pipe valves by cleaning personnel. There was a defect in cleaning that often occurs. As a result, the sampling pipe becomes blocked and the liquid to be measured cannot flow through, requiring a large amount of time to recover from the problem, and in some cases, it may be necessary to replace the pipe with a new one. did. In particular, when measuring the concentration of oil contained in wastewater in the tanks of oil tankers, various petroleum products and crude oils are loaded as cargo, and some of these crude oils have extremely high viscosity or have high pour points. The sampling pipes were often contaminated or blocked by these oils. Additionally, measurement equipment on these oil tankers is used infrequently and is not used for long periods of time, making contamination problems especially likely to occur under these operating conditions, making this type of measurement difficult on ships. It was about right.

In view of these circumstances, the present invention eliminates such deficiencies related to contamination, satisfies various measurement conditions, performs reliable measurements through sequential operations, and also ensures that cleaning is performed in between. This is to ensure that what has been said has been confirmed.

[Means and effects for solving the problem] Therefore, the present invention branches from the branch port A of the measurement tube 2 through which the liquid to be measured flows, passes through the switching device 4, the suction pump 5, and the detection section 6 in sequence. In the apparatus for measuring contaminants in the liquid to be measured, which is provided with sampling pipes 3 and 11 for discharging to the discharge port B and measuring the contaminants in the liquid to be measured, the cleaning pipe sends the cleaning water from its inlet C to the switching device 4, and the suction pipe A control unit 7 controls the operation of the pump 5 and switches each flow path, and a first flow path from the inlet C to the outlet B and from the inlet C to the branch port A according to a switching operation signal from the control unit 7. A switch 4 is installed in the washing pipe 10 to measure the flow rate of the washing water, and when the flow rate is below a predetermined flow rate, It is equipped with a flow detector 8 that transmits an alarm detection signal to the control section 7, and the control section 7 performs a cleaning operation of the first flow path and the second flow path before starting the measurement, Measurement is possible only after the operation is completed, and sequence control is performed so that the cleaning operation of the first flow path and the second flow path is performed again after the measurement is completed, and an alarm is issued by the signal detected by the flow detector 8. Then, when an alarm occurs, the pipeline is repaired, and measurements are always performed with the above-mentioned cleaning performed reliably.

[Example] Next, an example will be described based on the drawings.
FIG. 1 is a system diagram of one embodiment of the measuring device according to the present invention. 1 and 1' are liquids to be measured, and 2 and 2' are measurement tubes through which the liquids to be measured flow. 11 is measurement tube 2
The liquid to be measured 1 is branched from branch ports A and A' of
This is a pipe line for sampling which sequentially passes through the switching device 4, the suction pump 5, and the detection section 6, and then discharges the samples 1' and 1' to the outlet B. 3 and 3' are sampling pipes connecting the branch ports A and A' and the switching device 4. Reference numeral 8 denotes a flow detector provided between the inlet C and the switching device 4, which detects whether the cleaning water is flowing normally in the cleaning process described later. 9 is the cleaning water, 10 is the cleaning water 9 from the inlet C to the switching device 4
This is the cleaning pipe that sends the water to the The switch 4 receives a switching operation signal c according to various operations from the control unit 7, and flows the liquid to be measured 1 into the measurement sampling pipe 11 from the branch port A to the discharge port B, or flows the washing water 9 into the inlet C.
For example, it is a directional switching valve that switches each flow path from the inlet C to the first flow path from the outlet B to the second flow path from the inlet C to the branch port A. The suction pump 5 sucks the liquid to be measured 1 and the cleaning water 9 according to the control signal b for starting and stopping suction according to each operation from the control unit 7, sends them from the switch 4 to the detection unit 6, and discharges them to the discharge port B. It's a pump. The detection section 6 is a detection sensor that detects contaminants in the flowing fluid such as the liquid to be measured 1 and the washing water 9 and sends a measurement signal a to the control section 7 . The control unit 7 is a sequence control unit that is equipped with, for example, an operation panel, an indicating instrument, and a recorder, and the operation panel has push buttons and indicator lights arranged to indicate the order of operations so that various operations can be performed in an orderly manner while confirming the results. It is. In other words, the measurement process begins only after the cleaning process and calibration, which begin with the operation of the suction pump to start the measurement process, are input, and the measurement signal a is input, the measured value is displayed on the indicator, and recorded on the recorder at the same time. to end the measurement. After the measurement process is completed, the sequence operation is controlled so that the cleaning process is performed again and all measurements are completed by stopping the operation of the suction pump. Furthermore, the operation of the measuring device according to the present invention will be explained.

First, in the present invention, a cleaning process is provided before and after the measurement process, and the pipe line 11 including the sampling pipe 3, the switching device 4, the suction pump 5, the detection unit 6, etc. are thoroughly washed with the cleaning water 9, so that accurate measurements can always be made. I have to. Before measurement, the first flow path in the switching device 4 through which the cleaning water 9 flows from the inlet C to the outlet B is opened. Therefore, the cleaning water 9 flows through the switching device 4, the suction pump 5 and the detection unit 6. A part of the pipe line 11, the switching device 4, the suction pump 5, and the detection section 6 are washed by the flow of the washing water 9. The washing period continues until sufficient washing is achieved. Further, in response to another switching operation signal c from the control section 7, the second flow path of the switching device 4 is opened so that the cleaning water 9 flows from the inlet C to the branch port A. Therefore, the cleaning water 9 passes through the control section 7, flows through the sampling pipe 3 in a direction opposite to the flow direction of the liquid to be measured 1, and flows into the measuring pipe 2 through the branch port A. This flow washes the switching device 4 and the sampling pipe 3. The washing period continues until sufficient washing is achieved. This second
For example, the cleaning of the flow path automatically stops when the cleaning time exceeds the time set by the timer of the control unit 7.
The switching device 4 closes the flow path from the inlet C to the branching port A, and when the measurement is completed, the switching device 4 switches the cleaning water 9 to the first flow path and the second flow path in response to a switching operation signal c from the control unit 7. The flow path is opened to allow flow into the flow path. Therefore, the flow of the liquid 1 to be measured from the measuring tube 2 is stopped, and the washing water 9 flows through the sampling pipe 3, the switching device 4, and the branch port A to the measuring tube 2. This operation is automatically performed by the measurement end operation. In the cleaning process after this measurement, the liquid to be measured 1 in the pipe line 11, the switching device 4, the suction pump 5, and the detection unit 6 is removed.
Contamination caused by contaminants inside is thoroughly washed away and prepared for next use. The cleaning of the second flow path is set for a cleaning time using a timer, for example, similar to the cleaning process before measurement, and is automatically stopped when this set time has elapsed. However, the cleaning of the first channel continues and ends when the suction pump 5 starts to be stopped.

As explained above, cleaning is performed by sequence control of various operations that occur sequentially in all pipelines before and after the measurement process. If a manual valve (not shown) provided in the middle of the pipe line 11 is closed or if the pipe line 11 is blocked by contaminants in the liquid to be measured 1, the cleaning water 9 When the flow becomes sluggish, the flow detector 8 measures the flow rate in the first flow path or the second flow path, detects that the predetermined flow rate is not present, and sends a flow detection signal d to the control unit 7 indicating an abnormality. . The control unit 7 issues an alarm based on this signal to notify the operator that the washing water 9 is not flowing. The operator can immediately stop the suction pump, press the power button to turn off the power, and proceed to repair the pipeline. Further, contaminants in the original liquid can be accurately measured in a state where the liquid is always properly washed at a predetermined time. Therefore, there is no possibility that the conduit 11 or other equipment is contaminated or blocked by contaminants contained in the liquid 1 to be measured, which makes measurement impossible, unlike in the conventional case. Further, since the operator operates the valve manually even though there is a cleaning channel, there is no possibility of forgetting the cleaning operation or causing a cleaning mistake due to an erroneous operation. The inability of oil concentration meters in conventional ships to measure water content was mostly due to the fact that even if a washing channel was provided, it was not used or washing was insufficient.

By carrying out cleaning through various sequential operations without leaving it to the judgment of the operator as in the present invention, it has become possible to measure contaminants in liquid, which was previously considered difficult.

FIG. 2 is an explanatory diagram of a sequence operation pattern of the measuring device according to the present invention. In Fig. 2, the horizontal axis shows the passage of time, and A is from the inlet C to the outlet B.
Cleaning of the first flow path from the inlet C to the branch A
Cleaning of the second flow path from branch port A to discharge port B
d shows the calibration during washing. When the power button is pressed in the control unit 7, power is supplied. Next, the operation of the suction pump is started at time E, and the first
When cleaning of the flow path is started, the cleaning water 9 is transferred to the switching device 4,
It flows to the discharge port B through the suction pump 5 and the detection unit 6.

Next, a calibration operation, which always carries out zero adjustment and span adjustment of the device before the measurement process, is started by a calibration start operation at the point in time. At the same time, cleaning of the second flow path is started, and the cleaning water 9 is transferred to the switching device 4 and the sampling pipe 3.
It flows through the branch to branch A. This cleaning of the second channel automatically ends when the timer set time T elapses. Calibration also automatically ends at point K after a certain period of time has elapsed. An interlock is provided in the control unit 7 so that the measurement start operation is performed at point F only after the cleaning and calibration of the second flow path are completed. Therefore, measurement cannot be started until the above two operations are completed. Next, the cleaning of the first channel is completed by the measurement start operation, and the measurement liquid 1 flows through the measurement channel from the branch port A to the discharge port B of the measurement tube 2, and the detection unit 6 detects the amount of water in the liquid. Measurement of contaminants begins. Next, to end the measurement, the measurement end operation is performed at time G, and the switching device 4 is switched from the measurement flow path to the first flow path and the second flow path by the switching operation signal c from the control unit 7. , suction of the liquid to be measured 1 is stopped, and at the same time the washing water 9 is discharged from the outlet B.
Then, the water flows in the direction of the branch port A and starts washing.
The cleaning of the second flow path continues for a time T set by a timer in the same manner as before the measurement process, and automatically ends when this time T elapses. The cleaning of the first flow path continues and is only completed when the operation of the suction pump is stopped at time H. As explained above, the cleaning process starts from point E when the suction pump is started and ends at point H when the suction pump is stopped. After the measurement is completed, the pump and detection unit can be thoroughly cleaned and prepared for next reuse.

In FIG. 1, the flow detector 8 is arranged to detect the flow in common to the first flow path and the second flow path, but it is also possible to arrange it separately in both flow paths. The effect remains the same. Furthermore, even when there are multiple objects to be measured, that is, when the liquid to be measured 1' shown in Fig. 1 flows through the measuring tube 2' and there is a sampling pipe 3' from the branch port A', multiple objects can be measured using a switching device. Exactly the same sequence operation is possible by switching from two sampling pipes to one in which the liquid to be measured can be sucked through one sampling pipe. Furthermore, if you gain experience in measuring with the measuring device of the present invention, you will be able to automatically set each point after point E when the suction pump is started manually, using a timer, etc. It is also easy to do everything automatically.

[Effects of the invention] The present invention prevents contamination of sampling pipes, other related pipes, detection parts, etc. by these contaminants, and further prevents contamination of sampling pipes, other related pipes, detection parts, etc. Cleaning is performed through sequence operations to prevent blockage of these pipes, and to ensure that this cleaning is performed correctly.
The flow rate of cleaning water during cleaning operation is measured, and if the flow rate is below a predetermined level, a countermeasure is taken by sending an alarm detection signal to the control unit of the measuring device, ensuring that cleaning is always performed correctly and reliably. This allows for flexible measurements to be carried out.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the measuring device according to the present invention, and FIG. 2 is an explanatory diagram of a sequence operation pattern of the measuring device according to the present invention. DESCRIPTION OF SYMBOLS 1...Liquid to be measured, 2...Measurement tube, 3...Sampling pipe, 4...Switcher, 5...Suction pump, 6...Detection section, 7...Control section, 8...Flow detector, 9...Washing water, 10...Washing pipe, 11
...Pipeline.

Claims (1)

[Scope of utility model registration request] Sampling pipes 3 and 11 are provided which branch from the branch port A of the measurement pipe 2 through which the liquid to be measured flows, pass through the switching device 4, the suction pump 5, and the detection unit 6 in order, and then discharge to the discharge port B for measurement. The device for measuring contaminants in the liquid to be measured includes a cleaning pipe that sends cleaning water from its inlet C to the switching device 4, and a control unit 7 that controls the operation of the suction pump 5 and controls the switching of each flow path. , a first flow path from inlet C to outlet B, a second flow path from inlet C to branch port A, and a second flow path from branch port A to outlet B according to a switching operation signal from control unit 7.
a switching device 4 that switches between the measurement flow path and the measurement flow path;
The controller 7 is installed in the cleaning pipe 10 to measure the flow rate of the cleaning water, and when the flow rate is less than a predetermined value, the controller 7
A flow detector 8 is provided to send an alarm detection signal to the flow detector 8. Prior to the start of measurement, the control unit 7 performs a cleaning operation of the first flow path and the second flow path, and the operation is completed. It becomes possible to measure only after
Further, after the measurement is completed, sequence control is performed so that the cleaning operation of the first flow path and the second flow path is performed again, and an alarm is issued by a signal detected by the flow detector 8. measuring device.