JP3018753B2 - Cell life prediction system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a loss of accuracy and sensitivity of one detector of the detection amount plurality of O ₂ detectors located in each point of less unchanged for example flue by location The present invention relates to a cell life prediction system for making a prediction by comparing with a trend of another detector.

[0002]

2. Description of the Related Art FIG. 4 shows a configuration example of a conventional cell life prediction system. In the drawing, reference numeral 10 denotes, for example, a concentration cell type zirconia O ₂ detector comprising a sensor portion and a converter, and a plurality of these detectors are arranged, for example, in the middle of a flue. The detection signal from each detector is sent to the arithmetic unit via the data bus 12. Arithmetic unit 11
Calibrates the detector every fixed period (for example, every month), measures the response speed and cell resistance, corrects the zero point fluctuation and span fluctuation, and monitors the deviation of each value from the set value. ing.

[0005] For example, as shown in FIG. 5, scores of one to five levels are set for each value. That is, if the response speed is within 5 seconds, the score is set to 5 if the response speed is 5, 30 seconds or more. The score is 5 when the cell resistance is within 0.3 kΩ, and 1 when the cell resistance is 10 kΩ or more.
Further, a zero point and a span point of each detector are determined in advance, and a score is determined according to a deviation amount from the point. And
As shown in FIG. 6, when the scores are all 4 or more, the cell life is predicted to be 1 year or more. When the scores are all 3 or more, the cell life is predicted to be about 3 months. If so, the cell life is predicted to be within one month. According to the above configuration, the life of the cell can be predicted every time calibration is performed, and appropriate measures such as replacing parts can be performed before the detector is damaged.

[0004]

In the above-described conventional cell prediction system, the cell life is determined at the time of calibration. If an abnormality occurs in the detector during the calibration period, the next calibration is performed from that point. In the meantime, the detector is unaware of the abnormality of the detector, which results in an undesirable operation of the process. The present invention has been made in order to solve the above-mentioned conventional problems, and monitors a trend of a response time at the time of calibration of a specific detector among a plurality of sensors and a trend of a physical quantity detected by each detector at the time of sampling. Another object of the present invention is to provide a more elaborate cell life prediction system by monitoring the abnormality of the detector from these trends.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of detectors for detecting physical quantities at three or more measurement points, and inputs signals from the detectors, In a life estimation system having an arithmetic unit for monitoring at least a response time of a detector, the arithmetic unit includes a trend operation unit for the detected physical quantity and a cell life setting unit, and the response of all the detectors after calibration of each detector. The average value of the time is calculated, the difference between the response time of each detector is calculated, and the difference from the average value of each detector is calculated. If the maximum permissible difference in the response time of the detectors exceeds a predetermined number of times continuously, an alarm is issued to notify that the detector has deteriorated, and the physical quantity measurement results of all the detectors are taken at a predetermined sampling time. Average and each The physical quantity measurement results of the transmitters are compared, and if the difference exceeds the maximum allowable value of the difference between the average physical quantity detection quantity of all detectors and the physical quantity detection quantity of each detector continuously for a predetermined number of times, It is characterized by having means for issuing an alarm for notifying that the detector has deteriorated.

[0006]

The arithmetic unit calculates the average value of the response time of each detector at the time of calibration (for example, once a month), and calculates the difference between the average value and the response time of each measured value. Further, the average value of the detection signal related to O ₂ of all the detector to a preset each sampling (for example, several seconds) and calculates the difference between the average value and the detection signal of each measurement. By monitoring the state of deviation from those average values, the degree of deterioration of each detector can be known.

[0007]

FIG. 1 is a block diagram showing an embodiment of a cell life prediction system according to the present invention. In the figure, FIG.
Although the same elements are denoted by the same reference numerals and redundant description is omitted, in the present invention, the trend calculating means 11a and the cell life setting means 11c for monitoring the trend and setting the cell life are provided in the arithmetic unit 11. Has been added. In the above configuration, the operation unit 11a has a function similar to that of the conventional method, and takes in a signal from the detector 10 every time calibration is performed to display the cell life.

In the present invention, in addition to the above functions, the average of the response times of all the detectors is obtained every calibration, and the difference between the response time of each detector and the average response time is obtained. FIG. 2 shows a flowchart performed at the time of calibration. In general, the response time of a detector deteriorates and becomes longer as time elapses, but here the response time of each detector is calculated from the average value (τ _n ) of the response times of all detectors during calibration performed before the start of measurement. The difference (τ _n −τ) of (τ) is calculated by the calculating means 11b. The calculating means is provided with setting means for setting the maximum allowable value of the difference between the average response time of all the detectors and the response time of each detector. The difference between the average response time and the response time of each detector (Δ
When τ) exceeds the set value, the detector is specified and stored as, for example, plus one.

In the next calibration, the same calculation is performed. For example, if the difference between the response time of the specified detector and the average value does not exceed the maximum allowable value, the numerical value stored as plus 1 is set to 0. Return (assuming it did not exist). In this case, if the value again exceeds the maximum allowable value, 1 is added to the specified detector, and the result is added to 2. If the tendency of exceeding the maximum allowable value continues, for example, five times, the specified detector judges that deterioration has started and issues an alarm.

[0010] Each detector is to measure the amount of O ₂ at the time of sampling every few seconds, where at the same time all the detectors of O ₂ detected amount of average (O _2n) and the O ₂ detected amount of each detector Difference (O ₂ −
O _{2 n} ). FIG. 3 shows a flowchart performed at the time of sampling. The computing unit is provided with setting means for setting the maximum allowable value of the difference between the average value of the O ₂ amount detected by all the detectors and the O ₂ value detected by each of the detectors. said stored identified by for example plus 1 and the detector when the difference between the average of the amount of O ₂ of each detector of the amount of O ₂ and the total detector (delta O.D. ₂₎ is beyond the set value.

In the next sampling, the same operation is performed.
For example, the difference between the O ₂ detected amount of the identified detector and the average value may not exceed the maximum allowable value (assumed did) that the numerical value stored as the plus one to return 0. In this case, if the value again exceeds the maximum allowable value, 1 is added to the specified detector, and the result is added to 2. If the tendency of exceeding the maximum allowable value continues, for example, five times, the specified detector judges that deterioration has started and issues an alarm. It may be other detector without in the above embodiment has been described with reference to O ₂ detector is limited to O ₂ detector.

[0012]

According to the present invention as specifically described with above embodiments according to the present invention, it was set to determine the deterioration by comparing the change in response time and O ₂ detected amount with other detectors of variation Therefore, the tendency of deterioration can be known early, and a fine-grained cell life prediction system can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing a cell life prediction system of the present invention.

FIG. 2 is a flowchart for determining a cell life from a response time.

FIG. 3 is a flowchart for determining a cell life from an O ₂ measurement amount.

FIG. 4 is a configuration block diagram showing a conventional cell life prediction system.

FIG. 5 is a diagram showing an example of evaluation items and scores of a conventional cell life prediction system.

FIG. 6 is a diagram showing the relationship between a conventional cell life prediction value and conditions.

[Explanation of symbols]

 Reference Signs List 10 Detector 11 Computing device 11a Trend computing section-11c Cell life setting means 12 Data bus

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-16757 (JP, A) JP-A-4-132948 (JP, A) JP-A-4-152220 (JP, A) JP-A-62-162 289753 (JP, A) JP-A-3-175460 (JP, A) JP-A-52-120857 (JP, A) JP-A-63-153422 (JP, A) JP-A-3-253219 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01N 27/26 391

Claims (1)

(57) [Claims] 1. A life prediction system comprising: a plurality of detectors for detecting physical quantities at three or more measurement points; and an arithmetic unit for receiving a signal from the detector and monitoring at least a response time of each detector. In the system, the computing device has a means for calculating the trend of the detected physical quantity and a cell life setting means, and calculates the average value of the response times of all the detectors after the calibration of each detector, and calculates the average value of the response times of the detectors. The difference is calculated to obtain the difference from the average value of each detector, and the difference is determined by continuously setting a predetermined maximum response time between the average response time of all the detectors and the response time of each detector. If the number of times exceeds the limit, an alarm is issued to notify that the detector has deteriorated, and at every predetermined sampling time, the average value of the physical quantity measurement results of all detectors is compared with the physical quantity measurement result of each detector. Difference is preset If the maximum allowable value of the difference between the average physical quantity detected by all the detectors and the physical quantity detected by each detector exceeds a predetermined number of times continuously, a means for issuing an alarm for notifying that the detector has deteriorated is provided. A cell life prediction system, comprising: