CN109813782A - A kind of self diagnosis PH on-line monitoring system and method - Google Patents
A kind of self diagnosis PH on-line monitoring system and method Download PDFInfo
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Abstract
The invention discloses a kind of self diagnosis PH on-line monitoring systems: signal acquisition module, the current duty parameter of acquisition atmospheric and vacuum distillation unit；PH control module, the current PH measured value of acquisition atmospheric and vacuum distillation unit；PH estimates module, PH estimated data library is prestored, PH estimated data library includes the pH value of monitoring point and the historical data of duty parameter related to pH value, after receiving current duty parameter, it is compared with PH estimated data library, obtains PH discreet value corresponding to current duty parameter；Fault diagnosis module receives PH measured value and PH discreet value, and the self diagnosis of validity is carried out to PH measured value and such as effectively then using PH measured value as PH right value, and is modified with PH discreet value；As invalid, then using PH discreet value as PH right value.The self diagnosis of the validity to PH measured value may be implemented in the system, avoid electrode when breaking down without exact value for subsequent use, and can occur being modified when deviation to PH measured value.
Description
Technical field
The invention belongs to PH on-line monitoring technique field, in particular to a kind of self diagnosis PH on-line monitoring system and method.
Background technique
PH measurement belongs to galvanic interaction, and principle is to convert electric energy for chemical energy.PH measurement is that industrial circle uses extensively
General process monitoring means have passed through the development in a nearly century, and presently the most the most commonly used is liquid filled type glass electrodes.It should
The major part of electrode is sensing glass film and inner conductor, and inner conductor is made of interior reference solution and internal reference electrode, vitreous electricity
The electric channel that pole forms current potential relies primarily on micro- osmotic pressure of reference solution in electrode.When this electric channel is blocked, such as electrode
It is unsmooth positioned at hyperbaric environment or testing medium excessive concentration and interior reference solution fluid infusion, or when having bubble, it will
The extravasation of reference solution in hindering keeps measurement inaccurate；Another situation is testing medium reverse osmosis into interior reference solution, is made interior
Reference solution pollution even generates chemical reaction, then destroys internal reference electrode, eventually leads to measurement error and increases even electricity
Pole failure.
PH electrode belongs to easily-consumed products, for the service life for extending electrode, has had already appeared the PH with self-stripping unit on the market and has existed
Line monitoring device.The equipment opens medium valve in measurement, into medium；Opening or cleaning penstock after the completion of reading carries out electrode clear
It washes.By intermittent work, shorten the time of electrode contact medium, to extend electrode life.Some PH on-line monitorings
Integration of equipments two sets of PH electrodes, the using and the reserved also improve the service life of system.
But pH value is often obtained different results by different device measurings.The PH electrode of same producer's production exists
When measuring same media, the pH value obtained is also likely to be present biggish deviation.It may be by the result that obtains of large scale equipment chemical examination
Sampling, sample presentation can not reflect PH at that time since illumination, temperature etc. change on the way in time.Therefore, in terms of PH measurement, it is difficult
A correct standard value is found, and how to allow measured value correct as far as possible, there is no reliable algorithm at present.
Especially petroleum chemical enterprise's parameters for needing to pay close attention to water quality and medium in process of production, one of them
Important content is PH monitoring, and the monitoring of water quality or medium PH provide important ginseng for enterprise's technique adjustment and corrosive pipeline situation
Examine foundation.It is the general name of two devices of air-distillation and vacuum distillation, because two devices are usually one such as atmospheric and vacuum distillation unit
It rises, therefore referred to as atmospheric and vacuum distillation unit.It mainly include three processes: desalination, the dehydration of crude oil；Air-distillation；Vacuum distillation.From oil field
It is sent to the crude oil of oil plant often saliferous (mainly oxide) band water (being dissolved in oil or in emulsified state), can lead to the corruption of equipment
Erosion need to remove before processing in the composition of equipment inner wall fouling and influence product oil.
Despite the PH on-line monitoring equipment with self-stripping unit, in the operating condition of the high temperature and pressure high pollution of petroleum chemical enterprise
In, PH electrode is still easily damaged and is contaminated, and in terms of being limited to manpower and funds, the electrode damaged is difficult to timely
Replacement, can only continue to use.This allows for the stability of PH detection system and continues working ability and substantially reduce.With fault electrode
Reading as standard carry out industrial production, gently then production technology is caused to fluctuate, influences product quality；It is heavy then cause production system
It is unstable, cause safety accident.Therefore, how to allow pH value when electrode is normal and failure Shi Junneng is to the maximum extent close to accurate
Value, becomes problem to be solved.
Summary of the invention
The purpose of the present invention is to provide a kind of self diagnosis PH on-line monitoring system and methods, may be implemented to PH measured value
Validity self diagnosis, avoid electrode when breaking down without exact value for subsequent use, and can occur to PH measured value inclined
It is modified when poor.
The invention provides the following technical scheme:
A kind of self diagnosis PH on-line monitoring system, comprising:
Signal acquisition module, the current duty parameter of acquisition atmospheric and vacuum distillation unit, and be sent to PH and estimate module；
PH control module, the current PH measured value of acquisition atmospheric and vacuum distillation unit, and it is sent to self diagnosis module；
PH estimates module, prestores PH estimated data library, and PH estimated data library includes the pH value and and PH of monitoring point
The historical data for being worth related duty parameter compares with PH estimated data library, is worked as after receiving current duty parameter
PH discreet value corresponding to preceding duty parameter, and it is sent to fault diagnosis module；
Fault diagnosis module receives PH measured value and PH discreet value, and the self diagnosis of validity is carried out to PH measured value, if any
Effect, then as PH right value after using PH discreet value to be modified PH measured value；It is as invalid, then PH discreet value is correct as PH
Value.
The monitoring point is the sour water of normal pressure column overhead.
Wherein, PH is estimated in module, when constructing PH estimated data library, since the period of each data acquisition is different, and PH
Collection period be that three-times-weekly, therefore need to filter out as unit of day, the complete historical data of all data.And to history number
According to being pre-processed, the pretreated method are as follows: each duty parameter and corresponding pH value are subjected to Function Fitting, deleted inclined
From biggish data.
It includes: oil component, heat exchanger inlet and outlet temperature that the signal acquisition module and PH, which estimate the duty parameter in module,
Degree, flow, pressure, tower top infuse the pH value and flow of ammonium hydroxide, and tower top infuses the pH value and flow of purified water, and tower top infuses the PH of corrosion inhibiter
The pH value and flow of value and flow and reinjected water.
It is estimated in module in PH, PH estimated data library prestores each duty parameter to the correlation size of pH value,
Sequence of the duty parameter to the correlation size of pH value are as follows: tower top infuses the pH value of ammonium hydroxide and flow > tower top infuses purified water
The pH value and flow > oil component > heat exchanger stream of the pH value and flow > reinjected water of pH value and flow > tower top note corrosion inhibiter
Measure > heat exchanger inlet pressure.
Since heat exchanger inlet and outlet temperature, heat exchanger exit pressure and pH value correlation are relatively small, will not consider this two
A duty parameter.
In a particular application, since the pH value of the tower top note ammonium hydroxide of acquisition, the pH value of tower top note purified water and tower top note are slow
Itself error for losing the pH value of agent is larger, will lead to that PH discreet value is unstable and inaccurate, in duty parameter to the correlation of pH value
This partial data can be rejected when property size, re-starts sequence, sequence of the duty parameter to the correlation size of pH value are as follows: tower top
Infuse the flow > oil component of the flow > reinjected water of the flow > tower top note corrosion inhibiter of the flow > tower top note purified water of ammonium hydroxide
> heat exchanger total flow > heat exchanger inlet pressure.
The duty parameter determines the correlation size order of pH value by regression analysis or variance analysis.Such as scatter plot
The distribution of duty parameter, multiple regression analysis or partial Correlation Analysis under middle different PH.
Specifically, the correlation size order according to the distribution density of duty parameter under different PH in scatter plot or
Each duty parameter is analyzed to analyze the conspicuousness degree of pH value, relative coefficient, it specifically can be using multiple regression point
Analysis or partial Correlation Analysis.
It is estimated in module in PH, according to each duty parameter to the correlation size order and PH estimated data library ratio of pH value
It is right, the screening of historical data is successively carried out, using the pH value in the historical data finally screened as PH discreet value.
The process for carrying out historical data screening are as follows:
(1-1) compares the pH value of current tower top note ammonium hydroxide and flow with the historical data in PH estimated data library,
The pH value and the historical data near flow that screening obtains current tower top note ammonium hydroxide；
(1-2) carries out the historical data after the pH value of current tower top note purified water and flow and step (1-1) screening pair
Than the pH value and the historical data near flow that screening obtains current tower top note purified water；
(1-3) infuses the PH of corrosion inhibiter and the PH and stream of flow, reinjected water according to tower top according to step (1-1) and (1-2)
Amount, oil component, heat exchanger flow, the sequence of heat exchanger inlet pressure successively carry out the screening of historical data, and screening is obtained
Historical data pH value as PH discreet value.
Numerical value near duty parameter be duty parameter float up and down 10% or so historical data.
During being screened, if being left without qualified data group, the screening of the duty parameter is skipped, is pressed
Correlation size order carries out the screening of next duty parameter.
In PH control module, the PH measured value includes PH measured value A and the backup electrode acquisition for monitoring electrode acquisition
PH measured value B；When carrying out validity self diagnosis: as judge that PH measured value A is doubtful invalid when, need to PH measured value B into
Row validity self diagnosis, using PH measured value A or PH measured value B as PH measured value；When such as judging that PH measured value A is effective, it is not required to
Backup electrode is wanted to acquire PH measured value B, using PH measured value A as PH measured value.
In fault diagnosis module, to the method for PH measured value progress validity self diagnosis are as follows:
(2-1) compares the bound of the PH measured value A and pH value that monitor electrode acquisition, described to be limited to 4-12 up and down, such as
Beyond bound, then it is considered as monitoring electrode and breaks down, such as in upper and lower limits, then carry out step (2-2)；
PH measured value A is compared by (2-2) with the PH measured value of previous measurement period, if difference is 0.05-1, then
PH measured value A is effective, as PH measured value, carries out step (2-5)；As difference is greater than 1 or less than 0.05, is then considered as doubtful event
Barrier, PH measured value A is invalid, carries out step (2-3)
(2-3) resurveys PH measured value B using backup electrode, compares PH measured value A and PH measured value B, as difference≤
0.5, then PH measured value A is effective, as PH measured value, carries out step (2-5)；Such as difference > 0.5, then it is considered as and monitors electrode
Failure, and carry out step (2-4)；
(2-4) compares PH measured value B and PH discreet value, and such as difference≤0.5, then PH measured value B is effective, measures as PH
Value carries out step (2-5)；Such as difference > 0.5, then it is considered as backup electrode and breaks down, using PH discreet value as PH right value；
(2-5) is corrected PH measured value with PH discreet value, as PH right value.
Wherein, in step (2-1), the bound of the pH value is point of the historical data and extreme operating condition according to collection
Analysis is considered as and breaks down if exceeding the range, such as transmission signal is disturbed, and reads the case where being 0.
In step (2-5), with PH discreet value by the modified method of PH measured value are as follows: take the flat of PH discreet value and PH measured value
Mean value is as PH right value.
Also very a kind of method using above-mentioned self diagnosis PH on-line monitoring system of the present invention, comprising the following steps:
(1) pH value of monitoring point and the historical data of duty parameter related to pH value are acquired, and by different in scatter plot
The distribution density of duty parameter determines that duty parameter to the correlation size order of pH value, obtains PH estimated data library under pH value；
(2) the current duty parameter of acquisition atmospheric and vacuum distillation unit, and be sent to PH and estimate module, according to each duty parameter pair
The correlation size order of pH value is compared with PH estimated data library, is successively carried out the screening of historical data, will be finally screened to obtain
Historical data in pH value as PH discreet value；
(3) the current PH measured value of acquisition atmospheric and vacuum distillation unit, and be sent to self diagnosis module, according to the bound of pH value,
The PH measured value A's or backup electrode acquisition of the PH measured value of previous measurement period or PH discreet value judgement monitoring electrode acquisition
The validity of PH measured value B；
(4) it if PH measured value A or PH measured value B is effective, using PH measured value A or PH measured value B as PH measured value, is used in combination
PH right value is used as after PH discreet value amendment；If PH measured value A or PH measured value B is effectively invalid, using PH discreet value as
PH right value.
Compared with prior art, it is the advantages of technical solution provided by the invention: even if online PH monitoring device occurs
Biggish deviation also can carry out some amendments to being correctly oriented with PH discreet value；Even if equipment complete failure, is also connected to each other
The result (PH discreet value) of nearly truthful data is avoided for subsequent use using fault electrode pH value as causing to produce when exact value
Technological fluctuation influences product quality, even causes safety accident.
Detailed description of the invention
Fig. 1 is the flow diagram of the method provided by the invention using self diagnosis PH on-line monitoring system；
Fig. 2 is the process schematic that fault diagnosis module provided by the invention carries out self diagnosis；
Fig. 3 is that duty parameter is analyzed in embodiment to the scatter plot of the correlation size order of pH value.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, with reference to the accompanying drawings and embodiments to this
Invention is described in further detail.It should be appreciated that the specific embodiments described herein are only used to explain the present invention,
And the scope of protection of the present invention is not limited.
As Figure 1-Figure 2, self diagnosis PH on-line monitoring system provided by the invention includes:
Signal acquisition module, the current duty parameter of acquisition atmospheric and vacuum distillation unit, and be sent to PH and estimate module；
PH control module, the current PH measured value of acquisition atmospheric and vacuum distillation unit, and it is sent to self diagnosis module；
PH estimates module, prestores PH estimated data library, and PH estimated data library includes the pH value and and PH of monitoring point
The historical data for being worth related duty parameter compares with PH estimated data library, is worked as after receiving current duty parameter
PH discreet value corresponding to preceding duty parameter, and it is sent to fault diagnosis module；
Fault diagnosis module receives PH measured value and PH discreet value, and the self diagnosis of validity is carried out to PH measured value, if any
Effect, then using PH measured value as PH right value, and be modified with PH discreet value；As invalid, then just using PH discreet value as PH
Really value.
In the present embodiment, select the sour water of normal pressure column overhead as monitoring point, carry out PH on-line monitoring and from
Diagnosis.
Using self diagnosis PH on-line monitoring system provided in this embodiment to the pH value of the sour water of normal pressure column overhead into
The process of row monitoring and self diagnosis is as follows:
The historical data of S1, the pH value for acquiring monitoring point and duty parameter related to pH value, and by different in scatter plot
The distribution density of duty parameter determines that duty parameter to the correlation size order of pH value, obtains PH estimated data library under pH value.
In the present embodiment, duty parameter relevant to pH value, that is, influence the master of atmospheric tower sour water PH (PHL) value
It will be because being known as: oil component (salt content NaCl%), each heat exchanger inlet and outlet temperature (TIC), flow (Qi), pressure (PI), tower
(actual measurement is ammonia concn NH to the pH value of teeming ammonium hydroxide3%) and flow (QNH3), the pH value that tower top infuses purified water is (practical
Measurement is purified water naoh concentration H2) and flow (QH O%2O), (actual measurement is slow to the pH value of tower top note corrosion inhibiter
Lose agent dilute strength H%) and flow (QH) and reinjected water pH value (PHL) and flow (QH2OR).Wherein, reinjected water be containing
Remaining part after sulphur foul water fraction outlet, pH value is identical as sour water, therefore is still indicated with PHL
In the present embodiment, 3 annual datas are acquired as historical data, analyze duty parameter to the correlation size of pH value
Sequentially.
Since the period of each data acquisition is different, and the collection period of PH is that three-times-weekly, therefore need to filter out and be with day
Unit, the complete historical data of all data.And historical data is pre-processed, the pretreated method are as follows: will be each
A duty parameter carries out Function Fitting with corresponding pH value, deletes and deviates biggish data.
As shown in Table 1 and Table 2, the historical data for part acquisition passes through different PH in scatter plot in the present embodiment
The distribution density of lower duty parameter determines correlation size order, as shown in figure 3, in the scatter plot of the historical data of acquisition, with
PH value (the NH of oil component (salt content NaCl%) and tower top note ammonium hydroxide3%) and flow (QNH3) for.By analysis, QNH3*
NH3The value of % is bigger, and PHL is more intensive in high-order distribution；And when NaCl% increase, PHL is more equal from low level to high bit distribution
It is even, therefore NaCl% should be lower than QNH to the influence degree of PHL3*NH3%.By comparison repeatedly, finally sort out to PHL's
Influence degree size sequence are as follows: the pH value and flow > tower top note of pH value and flow > tower top note purified water that tower top infuses ammonium hydroxide delay
Lose the pH value of agent and the pH value and flow > oil component > heat exchanger total flow > heat exchanger inlet pressure of flow > reinjected water.
Since the concentration of each injecting is that artificial estimation by rule of thumb obtains, with ammonia concn NH3For %, worker is by estimating
Meter the ratio between ammonia valve and the opening time of water valve obtain its concentration.Thought that such data is unreliable, reject concentration data then,
Influence degree sequence is re-started, as a result are as follows: the flow > tower top that tower top infuses the flow > tower top note purified water of ammonium hydroxide infuses inhibition
The flow > oil component > heat exchanger total flow > heat exchanger inlet pressure of the flow > reinjected water of agent.
The Part load parameter that table 1 acquires
The Part load parameter that table 2 acquires
The current duty parameter of S2, acquisition atmospheric and vacuum distillation unit, and be sent to PH and estimate module, according to each duty parameter pair
The correlation size order of pH value is compared with PH estimated data library, is successively carried out the screening of historical data, will be finally screened to obtain
Historical data in pH value as PH discreet value.
Specifically, the current working parameter of signal acquisition module acquisition are as follows: PH measured value is 7.08, QNH3For 0.101m3/
H, QH2O is 2.14m3/ h, QH 0.025m3/ h, Qi 15.966m3/ h, PI 0.025MPa, NaCl% 6.12, reinjected water
It is closed, flow 0.
Wherein, PH measured value is the PH measured value A for monitoring electrode acquisition.
PH estimates module and is compared according to correlation size order of each duty parameter to pH value with PH estimated data library, according to
The detailed process of the secondary screening for carrying out historical data are as follows:
After carrying out unit conversion, QNH is filtered out3Data group between 111.1-90.9L/h；It is screened out from it QH again2O
In 2.354-1.926m3Data group between/h；It is screened out from it data group of the QH between 27.5-22.5L/h again；Again therefrom
Data group of the NaCl% between 6.732-5.508 is filtered out, then is screened out from it Qi in 17.5626-14.4394m3Between/h
Data group；Finally it is screened out from it data group of the PI between 0.0275-0.0225Mpa, the PHL for taking this group of data group all
For the average value of value as PH discreet value, PH discreet value corresponding to the duty parameter that currently acquires is 6.4.
In above-mentioned screening process, if leaving without qualified data group, the screening of the duty parameter is skipped, by correlation
Property size order carries out the screening of next duty parameter.
S3, the current PH measured value of acquisition atmospheric and vacuum distillation unit, and be sent to self diagnosis module, according to the bound of pH value,
The PH measured value A's or backup electrode acquisition of the PH measured value of previous measurement period or PH discreet value judgement monitoring electrode acquisition
The validity of PH measured value B.
As shown in Fig. 2, self diagnosis module carries out Effective judgement to the PH measured value A in step S3:
The upper and lower of pH value is limited to 4-12, and PH measured value A is without departing from this bound, then it is assumed that failure is not present in monitoring electrode.
PH measured value A is compared with the PH measured value of previous measurement period, the PH measurement of previous measurement period
Value is 7, and the PH measured value A of the currently monitored acquisition is 7.08, and the difference of the two is 0.08, and in the range of 0.05-1, then PH is surveyed
Magnitude A is effective, as PH measured value.
S4, PH measured value is corrected with PH discreet value, as PH right value.
The present embodiment judges that PH measured value 7.08 for virtual value, therefore it is carried out to be averaged operation with discreet value 6.4, obtains
To 6.74 as PH right value corresponding to current working parameter.
By comparing the pH value of PH right value and spot sampling chemical examination that self diagnosis PH on-line monitoring system obtains, to this hair
The reliability of the self diagnosis PH on-line monitoring system of bright offer is verified, its accuracy is examined, by nearly test in 90 days,
The PH right value value of the PH right value that self diagnosis PH on-line monitoring system provided by the invention obtains and the pH value of sampling chemical examination it
Number of days of the difference within 0.5 has high reliability 95% or more.
Technical solution of the present invention and beneficial effect is described in detail in above-described specific embodiment, Ying Li
Solution is not intended to restrict the invention the foregoing is merely presently most preferred embodiment of the invention, all in principle model of the invention
Interior done any modification, supplementary, and equivalent replacement etc. are enclosed, should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of self diagnosis PH on-line monitoring system, comprising:
Signal acquisition module, the current duty parameter of acquisition atmospheric and vacuum distillation unit, and be sent to PH and estimate module；
PH control module, the current PH measured value of acquisition atmospheric and vacuum distillation unit, and it is sent to self diagnosis module；
PH estimates module, prestores PH estimated data library, PH estimated data library include monitoring point pH value and with pH value phase
The historical data for closing duty parameter is compared with PH estimated data library, is obtained current after receiving current duty parameter
PH discreet value corresponding to duty parameter, and it is sent to fault diagnosis module；
Fault diagnosis module receives PH measured value and PH discreet value, and the self diagnosis of validity is carried out to PH measured value, such as effectively,
As PH right value after then using PH discreet value to be modified PH measured value；As invalid, then using PH discreet value as PH right value.
2. self diagnosis PH on-line monitoring system according to claim 1, which is characterized in that the signal acquisition module and PH
Estimating the duty parameter in module includes: oil component, heat exchanger inlet and outlet temperature, flow, pressure, the pH value of tower top note ammonium hydroxide
And flow, tower top infuse the pH value and flow of purified water, tower top infuses the pH value of corrosion inhibiter and the pH value and stream of flow and reinjected water
Amount.
3. self diagnosis PH on-line monitoring system according to claim 1, which is characterized in that it is estimated in module in PH, it is described
PH estimated data library prestores each duty parameter to the correlation size of pH value, and the duty parameter is big to the correlation of pH value
Small sequence are as follows: tower top infuses the PH of the pH value of ammonium hydroxide and the pH value of flow > tower top note purified water and flow > tower top note corrosion inhibiter
The pH value and flow > oil component > heat exchanger flow > heat exchanger inlet pressure of value and flow > reinjected water.
4. self diagnosis PH on-line monitoring system according to claim 3, which is characterized in that the duty parameter is to pH value
Correlation size order is determined by regression analysis or variance analysis.
5. self diagnosis PH on-line monitoring system according to claim 4, which is characterized in that it is estimated in module in PH, according to
Each duty parameter compares the correlation size order of pH value with PH estimated data library, successively carries out the screening of historical data,
Using the pH value in the historical data finally screened as PH discreet value.
6. self diagnosis PH on-line monitoring system according to claim 5, which is characterized in that the progress historical data screening
Process are as follows:
(1-1) compares the pH value of current tower top note ammonium hydroxide and flow with the historical data in PH estimated data library, screens
The pH value for obtaining current tower top note ammonium hydroxide and the historical data near flow；
Historical data after (1-2) screens the pH value of current tower top note purified water and flow with step (1-1) compares, and sieves
The pH value and the historical data near flow that choosing obtains current tower top note purified water；
(1-3) infuses the PH and flow, the PH of reinjected water and flow, original of corrosion inhibiter according to tower top according to step (1-1) and (1-2)
Oil ingredient, heat exchanger flow, the sequence of heat exchanger inlet pressure successively carry out the screening of historical data, the history that screening is obtained
The pH value of data is as PH discreet value.
7. self diagnosis PH on-line monitoring system according to claim 1, which is characterized in that described in PH control module
PH measured value includes the PH measured value A for monitoring electrode acquisition and the PH measured value B of backup electrode acquisition；When progress validity autodiagnosis
When disconnected: if when judge that PH measured value A is doubtful invalid, needed to PH measured value B progress validity self diagnosis, by PH measured value A or
PH measured value B is as PH measured value；When such as judging that PH measured value A is effective, backup electrode acquisition PH measured value B is not needed, by PH
Measured value A is as PH measured value.
8. self diagnosis PH on-line monitoring system according to claim 7, which is characterized in that right in fault diagnosis module
The method of PH measured value progress validity self diagnosis are as follows:
(2-1) compares the bound of the PH measured value A and pH value that monitor electrode acquisition, described to be limited to 4-12 up and down, such as exceeds
Bound is then considered as monitoring electrode and breaks down, such as in upper and lower limits, then carries out step (2-2)；
PH measured value A is compared by (2-2) with the PH measured value of previous measurement period, and if difference is 0.05-1, then PH is surveyed
Magnitude A is effective, as PH measured value, carries out step (2-5)；As difference is greater than 1 or less than 0.05, is then considered as suspected malfunctions, PH
Measured value A is invalid, carries out step (2-3)；
(2-3) resurveys PH measured value B using backup electrode, compares PH measured value A and PH measured value B, such as difference≤0.5,
Then PH measured value A is effective, as PH measured value, carries out step (2-5)；Such as difference > 0.5, then it is considered as monitoring electrode and event occurs
Barrier, and carry out step (2-4)；
(2-4) compares PH measured value B and PH discreet value, and such as difference≤0.5, then PH measured value B is effective, as PH measured value, into
Row step (2-5)；Such as difference > 0.5, then it is considered as backup electrode and breaks down, using PH discreet value as PH right value；
(2-5) is corrected PH measured value with PH discreet value, as PH right value.
9. self diagnosis PH on-line monitoring system according to claim 1 or 8, which is characterized in that in step (2-5), use PH
Discreet value is by the modified method of PH measured value are as follows: takes the average value of PH discreet value and PH measured value as PH right value.
10. a kind of method using any self diagnosis PH on-line monitoring system of claim 1-9, comprising the following steps:
(1) pH value of monitoring point and the historical data of duty parameter related to pH value are acquired, and passes through different PH in scatter plot
The distribution density of lower duty parameter determines that duty parameter to the correlation size order of pH value, obtains PH estimated data library；
(2) the current duty parameter of acquisition atmospheric and vacuum distillation unit, and be sent to PH and estimate module, according to each duty parameter to pH value
Correlation size order compared with PH estimated data library, successively carry out historical data screening, gone through what is finally screened
PH value in history data is as PH discreet value；
(3) the current PH measured value of acquisition atmospheric and vacuum distillation unit, and be sent to self diagnosis module, according to the bound of pH value, previous
The PH of the PH measured value A or backup electrode acquisition of the PH measured value of a measurement period or PH discreet value judgement monitoring electrode acquisition are surveyed
The validity of magnitude B；
(4) if PH measured value A or PH measured value B is effective, using PH measured value A or PH measured value B as PH measured value, and it is pre- with PH
PH right value is used as after valuation amendment；If PH measured value A or PH measured value B is effectively invalid, just using PH discreet value as PH
Really value.
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| CN111882195A (en) * | 2020-07-21 | 2020-11-03 | 清华大学 | Force and flow field data evaluation device and evaluation method |
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| CN114277195A (en) * | 2021-10-18 | 2022-04-05 | 欧尚元(天津)有限公司 | Method, device and equipment for controlling pH value of fermentation liquor in fermentation tank |
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