JP2008123463A - Test operation method of water treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform test operation of a mounting facility/equipment of a system as a control object by eliminating artificial failure of an operator. <P>SOLUTION: In this water treatment system, a series constitution where various water treatment facility/equipment are disposed and controlled by a programmable controller is used, this series is constituted by two series A and B. In this test operation method of the water treatment system, the test operation that is limited to non-operation series, of the series A and B, is performed every test operation (rest time, water level, or the like) of the facility and equipment mounted to the system or a test operation switch operation by the operator (S1-S3), when there is a failure or abnormality in the facility and equipment during test operation, the operator is informed of the fact with the display and the operation of the series during the operation is held (S4, S6, S7, S8, S10 and S11), and when there is no failure or abnormality, the normal display output can be acquired (S5 and S9). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a test operation method for a water treatment system such as sewage treatment or clean water treatment.

  FIG. 2 exemplifies a sewage treatment system, and shows a biological nitrogen removal treatment system by a cyclic nitrification denitrification method in a step method. This system is a method for supplying organic substances necessary for denitrification and sufficient nitrification of nitrogen, ensuring anoxic conditions in denitrification, by combining nitrification reaction and denitrification reaction.

  Reaction tanks (aerobic tanks) 1 and 2 for oxidizing ammonia nitrogen to nitrate nitrogen and nitrite nitrogen have denitrification tanks (anoxic tanks) 3 and 4 for converting nitrification gas into nitrogen gas at the inlets, respectively. Air is blown into the aerobic tanks 1 and 2 by the blower 5, and the nitrification liquid in the reaction tanks 1 and 2 is circulated to the denitrification tanks 3 and 4 by the pumps 6 and 7. The treated water denitrified in the reaction tank 2 is separated into sludge and treated water by the final sedimentation basin 8, and a part of the sludge is returned by the return sludge pump 9 to supply organic substances necessary for denitrification in the denitrification tank 3. Excess sludge is extracted by the pump 10.

  The programmable controller 11 is equipped with a surplus sludge control function 11A, a return sludge control function 11B, and a DO control function 11C having a software configuration. Based on a comparison with the set value (target value), control amounts such as excess sludge extraction amount, return sludge amount, aeration air amount, etc. are obtained to control the rotation speed and on / off control of the pumps 9, 10 and blower 5. I do.

  Such a water treatment system is usually provided with a plurality of series of facilities / equipment (tank equipment, pumps, measuring instruments) constituting the system in order to enable scale expansion, adjustment of the processing amount, and maintenance.

  In the water treatment system in which these multiple systems are arranged in parallel, the programmable controller 11 is provided with a test operation control function 11D for performing a test operation when the system is restarted or started up in addition to the functions necessary for system operation (for example, Patent Document 1).

In the test operation control, for example, in the system of FIG. 2, the operator determines the test operation conditions such as the inflow water level of the tanks 1 to 4 and then manually operates each facility / equipment, and this operation signal is used as a test operation control function. 11D, the test operation control function inputs the test operation measurement signal and the set value instead of the measurement signal and the set value input to each control function 11A to 11C such as the excess sludge control function, The trial run control function 11D determines and outputs whether or not the desired control amount can be obtained for each of the control functions 11A to 11C.
Japanese Patent Laid-Open No. 06-250712

  Since the conventional test operation method manually sets the test operation conditions based on the determination by the operator, there is a risk that an artificial determination error or an operation error may occur. If a trial run is performed with these mistakes occurring, the facility / equipment may be overloaded, resulting in failure or damage to the actual facility / equipment.

  As another test operation method for the controller, a simulated load is applied when the controller is shipped, but this test operation method is not possible for a test operation in which the system is actually operating and its facilities and equipment are connected. Further, it is impossible to find inconveniences of each control function assumed when mounted on the system.

  An object of the present invention is to provide a test operation method for a water treatment system that eliminates an operator's human error and can perform a test operation with a system installation facility / equipment as a control target.

  In order to solve the above problems, the present invention utilizes the fact that the system has a plurality of series configurations, and allows automatic input of test operation conditions for various facilities and equipment installed in the system or operation of a test run switch by an operator. A trial run is started, and this trial run is limited to a series that is not in operation for each trial run condition, and if there is a failure (abnormality) in equipment or equipment during the trial run, the operator is informed by that display and running This system is configured to maintain the following operation and is characterized by the following method.

(1) It is composed of various water treatment facilities / equipment, and is a series configuration in which these are controlled by a programmable controller, and this is a trial operation method of a water treatment system configured in multiple series.
A trial run limited to a series that is not in operation for each trial run condition is performed by automatic input of trial run conditions for the equipment / equipment installed in the system or by a trial run switch operation by the operator. In some cases, the display is provided with a test operation control means for notifying the operator of the display and holding the operation of the operating series and obtaining a normal display output when there is no failure or abnormality.

  As described above, according to the present invention, the trial operation is started by automatically inputting the trial operation conditions for the various facilities and equipment installed in the system or by the operator's trial operation switch operation. A trial run limited to non-trains was performed, and when there was a failure (abnormality) in equipment / equipment during the trial run, the operator was informed by the display and the operation of the current train was retained. is there.

  (1) Trial operation that does not require the operator to set trial operation conditions is possible, and human error of the operator is eliminated.

  (2) A test run can be performed with the system installation equipment / devices being controlled.

  (3) A test operation that avoids the operation stop of the entire system can be performed.

  (4) Failure / abnormal equipment / equipment can be repaired before actual operation.

  FIG. 1 is a trial operation sequence for realizing the trial operation control function 11D of the water treatment system according to the embodiment of the present invention, and is a trial operation sequence in the case where the system is configured by two systems A and B.

  The trial operation control function 11D is provided in one of the two series of programmable controllers, and each time one of various trial operation conditions such as equipment downtime (α hours or more) and inflow water level (change rate of β% or more) is given. Start test run control. Further, the trial run control is started by the operator turning on the trial run switch.

  To start the trial operation, first, it is determined whether or not the A-series operation is being performed among the two-series configuration systems A and B (S1). If the A-series operation is being performed, the B-series trial operation is started (S2), If the A series operation is not in progress, the A series trial operation is started (S3). In these test runs, the equipment / devices of the relevant series are sequentially operated for a short time, and the presence or absence of failures (including abnormalities) is checked.

  Next, the trial operation control function 11D determines whether or not there is a failure in the B-series facility / equipment during the B-series trial operation (S4). If there is no failure, all the B-series facilities / equipment are normal. A determination is made and an output signal indicating that the B series can be operated is generated (S5). If there is a failure in the B-series facility / equipment, the B-sequence failure indicator is turned on (S6), and the output of the A-series operation hold is obtained (S7).

  Similarly, the trial operation control function 11D determines whether or not there is a failure in the A-series facility / equipment during the A-series trial operation (S8), and if there is no failure, all the A-series facilities / equipment are normal. A determination is obtained and an output signal indicating that the A series can be operated is generated (S9). If there is a failure in the A-line facility / equipment, the A-line failure indicator is turned on (S10), and the B-series operation hold output is obtained (S11).

  The trial run control up to the above is repeated control by sequentially switching the trial run conditions. For example, at the end of the trial run for a certain trial run condition, switching to the A / B series run / stop by the start of the trial run for the next trial run condition is possible. When waking up, a trial run is performed on the other train that is not in operation.

  As described above, in the present embodiment, in the trial operation of the two-system system A and B, the system that is not in operation is caused to perform a trial operation for each trial operation condition, thereby preventing the entire system from being stopped due to the trial operation. In addition, the presence or absence of a malfunction due to the actual machine is confirmed by operating the facility / equipment of the stopped series for a short time.

  And if there is a failure, turn on the failure indicator to inform the operator, hold the operation of the other series to prohibit operation switching to the faulty series, using this holding period, Enables repair of faulty facilities and equipment. If there is no failure, display the normality of the equipment / equipment and inform the operator, and perform a trial run according to the following trial run conditions.

  In the embodiment, a case where the system has a two-line configuration of A and B is shown, but the same sequence can be realized even when the system is formed of three or more lines. That is, one series is set as a trial run target series, and the remaining series is handled as another series.

The trial run sequence of the water treatment system which shows embodiment of this invention. Configuration example of a sewage treatment system.

Explanation of symbols

1, 2 Aerobic tank 3, 4 Anoxic tank 5 Blower 6, 7, 9, 10 Pump 8 Final sedimentation tank 11 Programmable controller 12 Flow meter 13 DO meter 11D Test run control function

Claims (1)

It is composed of various water treatment facilities / equipment, and is a series configuration that controls these with a programmable controller.
A trial run limited to a series that is not in operation for each trial run condition is performed by automatic input of trial run conditions for the equipment / equipment installed in the system or by a trial run switch operation by the operator. In this case, the water treatment system is provided with a trial operation control means for notifying the operator by the display and holding the operation of the operating series and obtaining the normal display output when there is no failure or abnormality. Test run method.

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