CN102486390A - Method for steam pipe network of iron and steel enterprise to correct metering data - Google Patents

Method for steam pipe network of iron and steel enterprise to correct metering data Download PDF

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CN102486390A
CN102486390A CN2010105728572A CN201010572857A CN102486390A CN 102486390 A CN102486390 A CN 102486390A CN 2010105728572 A CN2010105728572 A CN 2010105728572A CN 201010572857 A CN201010572857 A CN 201010572857A CN 102486390 A CN102486390 A CN 102486390A
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data
value
flow
flowmeter
steam
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CN102486390B (en
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罗先喜
苑明哲
王宏
庞强
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Shenyang Institute of Automation of CAS
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Shenyang Institute of Automation of CAS
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Abstract

The invention relates to a method for a steam pipe network of an iron and steel enterprise to correct metering data, which comprises the following steps of: judging whether the working state of a flow meter is normal or not; if YES, judging whether flow data received by the flow meter has abnormal data; if YES, removing the abnormal data; accumulating the flow data after removing the abnormal data into a certification cycle, and carrying out certification to obtain certification data; and comparing the accumulated data and the certification data, if the accumulated data and the certification data have obvious differences, correcting the errors of the flow meter; accurately correcting the corrected flow data according to production consumption balance by a method of data coordination to obtain reasonable metering data of the steam pipe network. According to the method disclosed by the invention, when the flow meter has faults, the data of a point to be metered can be estimated, abnormal values in the measurement values can be timely found and removed, and the accuracy, the reliability and the rationality of the values of the steam flow meter can be improved. The method has an important significance for the iron and steel enterprise to improve the steam management level and reduce the energy consumption.

Description

A kind of iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to
Technical field
The present invention relates to a kind ofThe continuous data bearing calibration, a kind of specifically iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to.
Background technology
In iron and steel enterprise,, generally all there is complicated steam pipe system that multiple steaming a little with the vapour point connected together in order to realize the comprehensive utilization of waste heat complementary energy.Monitoring in real time and the generation and the use amount of accurately measuring steam, is the basis of iron and steel enterprise's steam scheduling and energy management.
Traditional pipe network measuring system relies on the variable of flowmeter fully to the flow measurement of pipeline each point.But because flowmeter calibration difficulties; Precision reduces with extending service time; And when flowmeter damage, converting means fault, transmission channel occurring and situation such as break down; The continuous data of steam pipe system differs and correctly reflects the real traffic of steam in the pipe network surely, thereby has a strong impact on production scheduling and managing power consumption and examination.
The actual value based on steam pipe system is always hoped in scheduling of iron and steel enterprise production of steam and management, what can access is variable (measured value), and error is always arranged between continuous data and the actual value.The adjustment of data is to adopt certain algorithm to eliminate the appreciable error in the measured value to measurement data, and reduces stochastic error, makes the data that obtain more near a kind of method of actual value.This method is proposed in 1961 by Kuehn and Davidson the earliest, and the correlative study of Chinese scholars afterwards makes the progressively systematization of this method, also has all difficulties but in actual production, apply.
The difficult point of iron and steel enterprise's steam measurement adjustment of data shows the following aspects.
1. the characteristic of steam is complicated, is difficult to accurate metering
Steam is different in different pressure and temperature lower densities, and the thermal loss of steam in transmission causes producing two-phase fluid, and the amount that produces condensate water also is difficult to estimate.Be difficult to steam is implemented the temperature and pressure compensation with traditional flowmeter, and the loss of estimation pipe network.Therefore steam flow measurement is existed than large deviation.
2. the precision of flowmeter itself is not high, and with lengthening service time, error can strengthen
The main orifice plate of flowmeter, V awl are main, and it is obvious that the precision of this type flow meter receives the influence of environment, tenure of use, and measuring error can progressively enlarge.And at the flowmeter of iron and steel enterprise's steam pipe system in case install, be difficult to calibration.
3. steam pipe system complex structure, the situation of have stoichiometric point not, diffusing and leaking,
The steam pipe system complex structure of iron and steel enterprise, outer contact is many.And the steam production and the steam consumption of major equipment often only are concerned about in the production run of enterprise, generally all do not have metering for little with vapour point.Therefore the metering redundance of iron and steel enterprise's steam pipe system is very little, brings difficulty to the adjustment of data.And diffusing and leakage problem of steam pipe system also aggravated the gap between the metering of vapour source and the user's variable.Can not simply carry out the adjustment of data, but the data at scene rationally handled according to practical experience according to the material balance principle.
4. stop the generation of the situation of measuring, aggravation cumulative flow value departs from its actual value.
When flowmeter fault or communication disruption, the situation that stops to measure will appear in the long-range measurement centre that does cummulative metering, and it is farther to make generating capacity and the use amount of steam depart from actual value.
Summary of the invention
To the above-mentioned weak point that exists in the prior art, what the technical matters that the present invention will solve provided a kind of precision that improves the steam-flow meter value, reliability is applicable to iron and steel enterprise's steam pipe system continuous data method of correcting.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is:
The present invention is applicable to that iron and steel enterprise's steam pipe system continuous data method of correcting may further comprise the steps:
Judge whether the flowmeter duty is normal;
If the flowmeter duty is normal, judge in the data on flows that flowmeter receives whether have abnormal data;
If there is abnormal data, then remove;
Data on flows behind the removal abnormal data is accumulate to an authentication period, carries out authentication, obtain verify data;
The data and the verify data of accumulation are compared,, then the flowmeter error is proofreaied and correct if there is significant difference in the two;
Data on flows after proofreading and correct is carried out fine correction according to producing the consumption balance through the method for data coordination, obtain rational steam pipe system continuous data.
The data and the verify data of accumulation are compared,, then directly data on flows is carried out fine correction according to producing the consumption balance through the method for data coordination, obtain rational steam pipe system continuous data if there is not significant difference in the two.
If there is not abnormal data, then continuing is accumulate to an authentication period with data on flows, carries out authentication, obtains the verify data step.
If the flowmeter working state abnormal is then estimated the flowmeter variable, obtain the estimated value of data on flows, whether there is the abnormal data step in the data on flows of judging the flowmeter reception that continues.
It is said that the flowmeter survey value is carried out estimation procedure is following:
According to pipe network structure, confirm with this flowmeter measuring point recently and be in the flowmeter of normal metering state, it is designated as REF;
If:
Figure 154668DEST_PATH_IMAGE001
In the formula,
Figure 552151DEST_PATH_IMAGE002
Be the flow actual value of this flowmeter position, Be the flow actual value of REF position, kBe correlation coefficient.Choosing available N history samples value of up-to-date preservation calculates k:
Wherein i=1 ~ NBe integer, represent the sampled value sequence number; NLength for sample sequence.
Figure 982499DEST_PATH_IMAGE005
Be this flowmeter i flow measurements in N history samples value,
Figure 488566DEST_PATH_IMAGE006
For REF exists NI measured value of individual history samples value;
The estimated value of this measurement point present flow rate is:
Figure 767101DEST_PATH_IMAGE007
Figure 714853DEST_PATH_IMAGE008
is the measured value of current sampling instant REF in the formula.
Saidly judge the flowmeter duty whether normal processes is following;
The absolute undulate quantity of definition data on flows is:
Figure 67337DEST_PATH_IMAGE009
Wherein
Figure 72202DEST_PATH_IMAGE010
(r=1 ~ M) for to begin, to length the data on flows sequence of M by the some cycles continuous acquisition from current time; R is an integer, represents the sequence number of sampled value, MLength for sample sequence;
During the flowmeter operate as normal VThe minimum of variation range and maximum statistical value do
Figure 572453DEST_PATH_IMAGE011
With
Figure 993070DEST_PATH_IMAGE012
During as
Figure 527957DEST_PATH_IMAGE013
, then think this flowmeter communication disruption;
During as
Figure 375827DEST_PATH_IMAGE014
, then think this flowmeter fault;
The process that judges whether there is abnormal data and remove is following:
If the measured value of t sampling instant is
Figure 363375DEST_PATH_IMAGE015
, then normal should meet the following conditions:
i)? ;
ii)?
Figure 323743DEST_PATH_IMAGE017
；
In the formula,
Figure 736270DEST_PATH_IMAGE018
, represent the minimum and maximum value that this measurement point steam flow can reach respectively in technological design;
Figure 801977DEST_PATH_IMAGE020
representes the sampling period;
Figure 257229DEST_PATH_IMAGE021
is illustrated in the maximum possible rate of change of steam flow in the sampling period;
Be i that do not satisfy condition simultaneously like measured value), ii); Then think exceptional value; This measuring point data is removed, and substituted current measurement data with the measurement data in the previous moment.
Be accumulate to an authentication period to carry out verification process following removing data on flows behind the abnormal data:
The data on flows of judging accumulation is from vapour source or user, if from the vapour source, then authentication method is following:
Adopt formula
Figure 785479DEST_PATH_IMAGE022
that the integrated flux that the vapour source produces is carried out authentication; Obtain flow authentication value
Figure 883885DEST_PATH_IMAGE023
;
Figure 510038DEST_PATH_IMAGE024
=1 ~ m (steam source adds up to m in the pipe network) in the formula, the numbering in expression vapour source.
Where,
Figure 959474DEST_PATH_IMAGE025
, ,
Figure 282188DEST_PATH_IMAGE027
denote steam source in a certification period, the cumulative flow of water, equipment used or consumed itself the accumulated flow and diffuse flow;
Figure 141560DEST_PATH_IMAGE028
,
Figure 750396DEST_PATH_IMAGE029
, These three were the actual flow of steam flow correction factor.
To some situation that steel enterprise does not have
Figure 996886DEST_PATH_IMAGE026
,
Figure 27159DEST_PATH_IMAGE027
measures, adopt the experimental formula estimation:
Figure 123291DEST_PATH_IMAGE031
Figure 634563DEST_PATH_IMAGE032
Figure 765330DEST_PATH_IMAGE033
,
Figure 966504DEST_PATH_IMAGE034
are respectively the instant flow of two kinds of situation in the formula, ,
Figure 861965DEST_PATH_IMAGE036
be respectively the time that continues at this metering section.
Figure 909555DEST_PATH_IMAGE037
Figure 219314DEST_PATH_IMAGE038
is respectively the flow formula calculation constant, and P is the gauge pressure in vapour source.
As the accumulation data on flows from the user, then authentication method is following:
If this measuring point is b user (b=1 ~ n of steam pipe system; The steam total number of users is n in the pipe network); Total p of this user uses the vapour point, and each uses the flow measurements of vapour point is
Figure 352355DEST_PATH_IMAGE039
(j=1,2;, p)
In the formula;
Figure 307858DEST_PATH_IMAGE041
(j=1; 2;, p) expression is respectively with the flow correction coefficient after the vapour point consideration loss.
If sub-metering is inaccurate or when not having sub-metering, adopt following method validation at all:
Figure 788518DEST_PATH_IMAGE042
Figure 143276DEST_PATH_IMAGE043
representative should be used to produce e (e=1 with the vapour point in the formula; 2; Q) quantity of kind product, the quantity of steam that the e kind product of the every production unit quantity of
Figure 62691DEST_PATH_IMAGE044
representative consumes.
The data and the verify data of accumulation are compared,, then non intelligent flowmeter error are carried out trimming process and be if there is significant difference in the two:
There is the situation identification of directional bias:
As
Figure 756977DEST_PATH_IMAGE045
; And the difference of measured value and authentication value is always greater than zero or less than zero the time; Think and have directional bias; U=1 ~ n+m in the formula, the outer contact numbering of expression steam pipe system. is the accumulated value of the measured value of u outer contact an authentication period, and
Figure 637876DEST_PATH_IMAGE047
is the authentication value of this node flow accumulated value.
The method of estimation of directional bias Wu:
Suppose u the continuous H of a node CMA cycle T to pipe network; Measured value is
Figure 33085DEST_PATH_IMAGE048
; Authentication value is
Figure 644195DEST_PATH_IMAGE049
; H=1; 2 ..., H
Figure 794554DEST_PATH_IMAGE050
The accumulated value of this flow after secondary is proofreaied and correct is:
Figure 61587DEST_PATH_IMAGE051
To carry out the fine correction process following according to producing method that the consumption balance coordinates through data to the data on flows after proofreading and correct:
1), and forms incidence matrix with outer contact numbering A
　A＝（1,...,-1,…）；
A is a number equal to the total number of steam source m; -1 point number equal to the total number of steam n; 2) empirically determined loss per hour of steam pipe network
Figure 57225DEST_PATH_IMAGE052
, and the total loss
Figure 726103DEST_PATH_IMAGE053
:
, TBe authentication period;
3) data are coordinated:
31) establish each outer contact flow measurements of steam pipe system be X (u, y), unit: the ton/hour;
U=1 ~ m+n, the outer contact numbering of steam pipe system.Y=1 ~ Z represents y measured value in the metering cycle, and each authentication period is measured Z time;
If instrument fault or the exceptional value situation occurs is pressed preceding method and is handled the back and substitute measured value with estimated value.
32) calculate the instant flow sample average of the outer contact of u
Figure 536114DEST_PATH_IMAGE055
Figure 601022DEST_PATH_IMAGE056
33) calculate in the metering cycle integrated flux of steam pipe system u outer contact:
Figure 124407DEST_PATH_IMAGE057
In the formula TsBe traffic sampling cycle, unit hour; If authentication is not passed through, then proofread and correct integrated flux and substitute this value with the secondary after the authentication.
Remember
Figure 353918DEST_PATH_IMAGE058
and be the cumulative flow value vector after the secondary correction;
Note
Figure 657861DEST_PATH_IMAGE059
is the flow vector after coordinating through data:
The objective function that fetches data and coordinate:
Constraint condition is:
Figure 638772DEST_PATH_IMAGE061
Get weighting matrix:
In the formula:
Figure 765177DEST_PATH_IMAGE063
, R (u) is the precision of the measurement of u flowmeter;
34) flow totalizer volume production consumption difference d:
Figure 109571DEST_PATH_IMAGE064
35) Calculation
Figure 669865DEST_PATH_IMAGE065
matrix:
Figure 238250DEST_PATH_IMAGE066
36) calculate Lagrange multiplier battle array K:
Figure 454467DEST_PATH_IMAGE067
37) Coordination residual matrix calculations
Figure 399290DEST_PATH_IMAGE068
:
Figure 751774DEST_PATH_IMAGE069
38) After calculating coordinate data flow
Figure 491059DEST_PATH_IMAGE070
:?
Figure 928994DEST_PATH_IMAGE071
The data coordination value of trying to achieve is carried out boundary value verification and equation of constraint verification: verification is not passed through like boundary value, then resets weight matrices; As reset and to pass through, then authentication flow and pipe network waste again.
The present invention has following beneficial effect and advantage:
1. the inventive method can be estimated the data of this measuring point when flowmeter breaks down;
2. the inventive method can in time be found in the measured value indivedual exceptional values and remove.
3. the inventive method can be implemented authentication to the data of cummulative metering according to the production process of steam and the method that is associated with steel manufacture process according to a CMA cycle.Analyze the deviation of metering result and authentication result, the appreciable error that possibly exist when confirming flowmeter survey (directional bias), and in metering, remove appreciable error.
To authentication period occur total generation and the difference between the total flow of steam, the method that adopts data to coordinate is rationally removed.
5. the inventive method has improved precision, reliability and the rationality of steam-flow meter value, and the vapor management level is improved in iron and steel enterprise, and it is significant to cut down the consumption of energy.
Description of drawings
Fig. 1 is a typical iron and steel enterprise steam pipe system observing and controlling structural drawing.
Fig. 2 is a principle of work sketch of the present invention.
Fig. 3 is that flowmeter state judgement in proper working order, estimation and exceptional value are removed journey figure.
Fig. 4 is the elimination process flow diagram of the authentication and the appreciable error (directional bias) of steam integrated flux.
Fig. 5 is the data tuning algorithm process flow diagram that produces the consumption difference.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
As shown in Figure 1; The TT&C system of iron and steel enterprise's steam pipe system mainly is to be the basis with the Distributed Control System (DCS) at present; To pass through data acquisition unit and industrial network from the flowmeter side of pipe network with steam pipe system holds state variables associated (temperature, pressure, flow) and control variable (valve opening), be transferred to energy management center or measurement centre.And administrative center or measurement centre can be sent to the scene through network and controller with the operational order of setting, diagnostic instruction and the electric control valve of sensing transducer according to the needs of producing.
The informationization of steam pipe system is the basic condition of embodiment of the present invention.
As shown in Figure 2, the present invention is applicable to iron and steel enterprise's steam pipe system continuous data method of correcting, may further comprise the steps:
Judge whether the flowmeter duty is normal;
If the flowmeter duty is normal, judge in the data on flows that flowmeter receives whether have abnormal data;
If there is abnormal data, then remove;
Data on flows behind the removal abnormal data is accumulate to an authentication period, carries out authentication, obtain verify data;
The data and the verify data of accumulation are compared,, then the flowmeter error is proofreaied and correct if there is significant difference in the two;
Data on flows after proofreading and correct is carried out fine correction according to producing the consumption balance through the method for data coordination, obtain rational steam pipe system continuous data.
As shown in Figure 3; The present invention is according to on-site experience, and the data characteristics that flowmeter is transferred to measurement centre (or command centre) when improper metering shows the curvilinear characteristic that comes, design discharge meter state discriminant function; Under function satisfies certain condition, judge that automatically this flowmeter metering is unusual.This moment, the reading of flowmeter was unreliable, need estimate data on flows.
According to on-site experience, mainly show two kinds of characteristics when flowmeter is unusual, a kind of is exactly that data do not change (generally being to be caused by communication disruption) for a long time, and another kind is that measured value is in short time fluctuation (sensor or flowmeter fault) up and down by a relatively large margin.In addition, to pipe network a certain vapour source or user, the statistical law during according to operate as normal is removed some obvious unusual data.
1. the automatic judging method of flow flowmeter operation irregularity state.
If the actual value of the instant flow variable that a certain flowmeter is measured is X (t), to M (SF 1Hz perhaps selects according to actual conditions) data of this measuring point continuous acquisition, whether normal duty is discerned to accomplish a flowmeter.
Definition: the absolute undulate quantity of data on flows is:
Wherein
Figure 967322DEST_PATH_IMAGE010
(r=1 ~ M) for to begin, to length the data on flows sequence of M by the some cycles continuous acquisition from current time; R is an integer, represents the sequence number of sampled value, and M is the length of sample sequence;
When the flowmeter operate as normal, to different measurement points, the V value is in a specific interval.
That is:
Figure 80772DEST_PATH_IMAGE072
In the formula;
Figure 68319DEST_PATH_IMAGE011
and
Figure 292627DEST_PATH_IMAGE012
when being the flowmeter operate as normal, the minimum of V variation range and maximum statistical value.
During as
Figure 682020DEST_PATH_IMAGE013
, then think this flowmeter communication disruption.
During as
Figure 966371DEST_PATH_IMAGE014
, then think this flowmeter fault.
For the probability that reduces to judge by accident,
Figure 237953DEST_PATH_IMAGE011
and
Figure 265951DEST_PATH_IMAGE012
need confirm according to on-the-spot actual operating data.
2. the monolithic flowmeter is unusually or in short-term during communication disruption, to the method for estimation of the instant data on flows of this measuring point.
According to pipe network structure, confirm with this flowmeter measuring point recently and be in the flowmeter of normal metering state, it is designated as REF;
If:
Figure 509851DEST_PATH_IMAGE001
In the formula;
Figure 965103DEST_PATH_IMAGE002
is the flow actual value of this flowmeter position;
Figure 927243DEST_PATH_IMAGE003
is the flow actual value of REF position, and k is a correlation coefficient.Choose available N history samples value of up-to-date preservation, adopt the correlation coefficient k in the least square method estimation formula.
Figure 493353DEST_PATH_IMAGE004
Wherein i=1 ~ N is an integer, represents the sampled value sequence number; N is the length of sample sequence.
Figure 594689DEST_PATH_IMAGE005
is this flowmeter i flow measurements in N history samples value,
Figure 283159DEST_PATH_IMAGE006
be i the measured value of REF N history samples value;
The estimated value of this measurement point present flow rate is:
Figure 836818DEST_PATH_IMAGE008
is the measured value of current sampling instant REF in the formula.
Unusual or communication disruption just adopts the flow authentication method among the present invention to long-time flowmeter, with authentication value as measured value.
3. the identification of exceptional value and removal in the measured value
When the flowmeter operate as normal, promptly so-called wild value the point that the outer signals disturbing effect obviously departs from other measured values can appear receiving.
If the measured value of t sampling instant is
Figure 992992DEST_PATH_IMAGE015
, then normal
Figure 852364DEST_PATH_IMAGE015
should meet the following conditions:
i)?
Figure 461200DEST_PATH_IMAGE016
;
ii)?
Figure 431430DEST_PATH_IMAGE017
；
In the formula,
Figure 504428DEST_PATH_IMAGE018
,
Figure 472384DEST_PATH_IMAGE019
represent the minimum and maximum value that this measurement point steam flow can reach respectively in technological design;
Figure 630833DEST_PATH_IMAGE020
representes the sampling period;
Figure 342437DEST_PATH_IMAGE021
is illustrated in the maximum possible rate of change of steam flow in the sampling period;
Be
Figure 535521DEST_PATH_IMAGE015
i that do not satisfy condition simultaneously like measured value), ii); Then think exceptional value; This measuring point data is removed, and substituted current measurement data with the measurement data in the previous moment.
Above condition shows, between a set scope, and rate of change also receives the restriction of pipe network and technology inevitable less than a definite value to the numerical value of steam pipe system flow measurement.
One of above condition does not satisfy, and then can this measuring point data be removed, and substitute current measurement data with the measurement data in the previous moment.
Be to reduce the probability of erroneous judgement, ,
Figure 51614DEST_PATH_IMAGE019
,
Figure 566909DEST_PATH_IMAGE021
three parameters need be according to historical data and experience adjustments.
As shown in Figure 4, the elimination process flow diagram of the authentication of steam integrated flux and appreciable error (directional bias).
Through differentiation and data estimation to flowmeter abnormal work state, obtain availability data preferably, accumulate with these data, just can obtain the integrated flux of CMA cycle (like an order of classes or grades at school).
But in practical application, some flowmeter often occurs when measuring steam flow, have appreciable error unidirectional and that numerical value is constant basically between measured value and the actual value always, this appreciable error is a kind of directional bias.
The measurement point of u steam flow on the steam pipe system (the vapour source of steam or the user of steam) is at an authentication period integrated flux actual value, and measured value is
Figure 986575DEST_PATH_IMAGE074
.Then have
Figure 791720DEST_PATH_IMAGE075
In the formula;
Figure 907444DEST_PATH_IMAGE076
is directional bias;
Figure 747224DEST_PATH_IMAGE077
is stochastic error, and:
Figure 290201DEST_PATH_IMAGE078
；
Figure 848221DEST_PATH_IMAGE079
；
Figure 502056DEST_PATH_IMAGE080
Wu is the directional bias between measured value and the actual value.
When iron and steel enterprise's ordinary production; According to certain measurement period; Write down its measured value series
Figure 461922DEST_PATH_IMAGE074
(u=1; 2 ..., m+n); And press following method to
Figure 175800DEST_PATH_IMAGE074
(i=1; 2 ..., m+n) carry out authentication.
1. steam source is to the feed flow authentication of pipe network
Steam source feed flow authentication formula:
Figure 17854DEST_PATH_IMAGE022
The integrated flux that the vapour source is produced carries out authentication; Obtain flow authentication value
Figure 413063DEST_PATH_IMAGE023
;
Figure 292682DEST_PATH_IMAGE024
=1 ~ m (steam source adds up to m in the pipe network) in the formula, the numbering in expression vapour source.
Where, ,
Figure 444495DEST_PATH_IMAGE026
,
Figure 643395DEST_PATH_IMAGE027
denote steam source in a certification period, the cumulative flow of water, equipment used or consumed itself the accumulated flow and diffuse flow;
Figure 374591DEST_PATH_IMAGE028
, , These three were the actual flow of steam flow correction factor.
To some situation that steel enterprise does not have
Figure 249509DEST_PATH_IMAGE026
,
Figure 772894DEST_PATH_IMAGE027
measures, can adopt the experimental formula estimation.
Figure 999476DEST_PATH_IMAGE031
Figure 241101DEST_PATH_IMAGE032
Figure 844121DEST_PATH_IMAGE033
,
Figure 222013DEST_PATH_IMAGE034
are respectively the instant flow of two kinds of situation in the formula,
Figure 885075DEST_PATH_IMAGE035
,
Figure 407805DEST_PATH_IMAGE036
be respectively the time that continues at this metering section.
Figure 752198DEST_PATH_IMAGE037
Figure 46914DEST_PATH_IMAGE038
constants were calculated flow.P is the gauge pressure in vapour source.
In above formula, confirm under the condition that
Figure 818560DEST_PATH_IMAGE037
,
Figure 831516DEST_PATH_IMAGE038
need can both correctly measure in pressure, flow and time.Little variation takes place in temperature, the pressure of it is pointed out that
Figure 776338DEST_PATH_IMAGE037
,
Figure 128822DEST_PATH_IMAGE038
understanding with steam.When the integrated flux authentication, its influence can be ignored.
2. steam pipe system is to the authentication of user's operational throughput
If this measuring point is b user (b=1 ~ n of steam pipe system; The steam total number of users is n in the pipe network); Total p of this user uses the vapour point, and each uses the flow measurements of vapour point is
Figure 133687DEST_PATH_IMAGE039
(j=1,2;, p)
Figure 571622DEST_PATH_IMAGE040
In the formula; (j=1; 2;, p) expression is respectively with the flow correction coefficient after the vapour point consideration loss.
If sub-metering is inaccurate or when not having sub-metering, adopt following method validation at all:
Figure 702892DEST_PATH_IMAGE043
representative should be used to produce e (e=1 with the vapour point in the formula; 2; Q) quantity of kind product, the quantity of steam that the e kind product of the every production unit quantity of
Figure 628122DEST_PATH_IMAGE044
representative consumes.
For reliability and the rationality that improves authentication;
Figure 979994DEST_PATH_IMAGE041
, need confirm in conjunction with historical data and experience under the condition of flowmeter through calibration.
3. the identification of directional bias and removal
According to the practical experience of metering, when in the appearance of certain section time measured value and authentication value than big-difference, and this species diversity is unidirectional all the time, promptly measured value is always greater than authentication value, or always less than authentication value, it is generally acknowledged to have directional bias, remove.
As
Figure 388158DEST_PATH_IMAGE081
; And the difference of measured value and authentication value is always greater than zero or less than zero the time; Think and have directional bias; U=1 ~ n+m in the formula, the outer contact numbering of expression steam pipe system.
Figure 863002DEST_PATH_IMAGE046
is the accumulated value of the measured value of u outer contact an authentication period, and
Figure 891001DEST_PATH_IMAGE047
is the authentication value of this node flow accumulated value.
The method of estimation of directional bias Wu:
Suppose u the continuous H of a node CMA cycle T to pipe network; Measured value is
Figure 134901DEST_PATH_IMAGE048
; Authentication value is
Figure 590153DEST_PATH_IMAGE049
; H=1; 2 ..., H
Figure 286713DEST_PATH_IMAGE050
The accumulated value of this flow after secondary is proofreaied and correct is:
Figure 852824DEST_PATH_IMAGE051
Figure 216809DEST_PATH_IMAGE082
assert the important parameter that whether has appreciable error between measured value and the authentication value; Generally need be according to on-site experience, factors such as the precision of instrument are confirmed between 10%-20%.
For intelligent flow meter, can remove measurement deviation through biasing setting, to non intelligent flowmeter, then on production commander or measurement centre's computing machine, handle.
 
As shown in Figure 5 is according to order of classes or grades at school or some cycles (CMA cycle T hour), according to total principle that produces with the wastage in bulk or weight balance, implements data and coordinates (adjustment) algorithm flow chart.
The method design that this method is found the solution according to least-squares estimation and Lagrange multiplier, its method step is explained as follows:
1. user's input parameter
1) externally contact is numbered, and forms incidence matrix A by certain requirement.
To each vapour source with vapour point numbering, and require the vapour source preceding during numbering, with vapour point after.
Obtain matrix A=(1 ... ,-1 ...)
1 number equals vapour source sum m among the A.
-1 number equals the total n with vapour point among the A.
2) loss per hour of steam pipe network
Figure 905279DEST_PATH_IMAGE052
, and the total loss
Figure 26819DEST_PATH_IMAGE053
:
Be the leakage of the condensate water that per hour produces of steam pipe system, pipe network, the normal amount of diffusing.Unit: ton/hour.The foundation of this value: the calculating of pipe network model, historical data statistics, experience estimation.
Figure 458937DEST_PATH_IMAGE054
TBe authentication period.
2. data coordination process.
1) establish each outer contact flow measurements of steam pipe system be X (u, y), unit: the ton/hour;
U=1 ~ m+n, the outer contact numbering of steam pipe system.Y=1 ~ Z represents y measured value in the metering cycle, and each authentication period is measured Z time;
If instrument fault or the exceptional value situation occurs is pressed preceding method and is handled the back and substitute measured value with estimated value.
2) calculate the instant flow sample average of the outer contact of u
Figure 736816DEST_PATH_IMAGE055
3) in metering cycle, the integrated flux of steam pipe system u outer contact:
Figure 267341DEST_PATH_IMAGE057
Ts is the traffic sampling cycle in the formula, unit hour.
In the formula TsBe traffic sampling cycle, unit hour; If authentication is not passed through, then proofread and correct integrated flux and substitute this value with the secondary after the authentication.
Remember
Figure 175254DEST_PATH_IMAGE058
and be the cumulative flow value vector after the secondary correction;
Note
Figure 248252DEST_PATH_IMAGE059
is the flow vector after coordinating through data:
The objective function that fetches data and coordinate:
Constraint condition is:
Get weighting matrix:
Figure 86261DEST_PATH_IMAGE062
In the formula:
Figure 13766DEST_PATH_IMAGE063
; R (u) confirms the precision (relative error) of the measurement of this flowmeter for for to u flowmeter dimension inspection experience, calibration and authentication.
Finding the solution data coordination value (smart calibration) promptly is to find the solution under constraint condition, and making objective function is that minimum least square is found the solution problem.The process of finding the solution is according to the 4th) to 11) step enforcement according to this.
4) flow totalizer volume production consumption difference d:
Figure 214940DEST_PATH_IMAGE064
　
5) calculate matrix:
Figure 378910DEST_PATH_IMAGE066
6) Lagrange multiplier battle array K:
Figure 98604DEST_PATH_IMAGE067
7) data are coordinated residual matrix
Figure 470679DEST_PATH_IMAGE068
:
Figure 541404DEST_PATH_IMAGE069
8) data are coordinated back flow
Figure 657127DEST_PATH_IMAGE070
:
Figure 559224DEST_PATH_IMAGE071
9) the data coordination value of trying to achieve is carried out boundary value verification and equation of constraint verification:
Do not pass through like verification, then need reset weight matrices.
As reset and to pass through, then authentication flow and pipe network waste again.

Claims (13)

1. one kind is applicable to iron and steel enterprise's steam pipe system continuous data method of correcting, it is characterized in that may further comprise the steps:
Judge whether the flowmeter duty is normal;
If the flowmeter duty is normal, judge in the data on flows that flowmeter receives whether have abnormal data;
If there is abnormal data, then remove;
Data on flows behind the removal abnormal data is accumulate to an authentication period, carries out authentication, obtain verify data;
The data and the verify data of accumulation are compared,, then the flowmeter error is proofreaied and correct if there is significant difference in the two;
Data on flows after proofreading and correct is carried out fine correction according to producing the consumption balance through the method for data coordination, obtain rational steam pipe system continuous data.
2. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 1; It is characterized in that: the data and the verify data of accumulation are compared; If there is not significant difference in the two; Then directly data on flows is carried out fine correction according to producing the consumption balance through the method for data coordination, obtain rational steam pipe system continuous data.
3. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 1, it is characterized in that: if there is not abnormal data, then continuing is accumulate to an authentication period with data on flows, carries out authentication, obtains the verify data step.
4. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 1; It is characterized in that: if the flowmeter working state abnormal; Then the flowmeter variable is estimated; Obtain the estimated value of data on flows, whether have the abnormal data step in the data on flows of judging the flowmeter reception that continues.
5. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 4, it is characterized in that: said that the flowmeter survey value is carried out estimation procedure is following:
According to pipe network structure, confirm with this flowmeter measuring point recently and be in the flowmeter of normal metering state, it is designated as REF;
If:
In the formula,
Figure 498603DEST_PATH_IMAGE002
Be the flow actual value of this flowmeter position,
Figure 554283DEST_PATH_IMAGE003
Be the flow actual value of REF position, kBe correlation coefficient; Getting available N history samples value of up-to-date preservation calculates k:
Figure 308613DEST_PATH_IMAGE004
Wherein i=1 ~ NBe integer, represent the sampled value sequence number; NLength for sample sequence;
Figure 107941DEST_PATH_IMAGE005
Be this flowmeter i flow measurements in N history samples value, For REF exists NI measured value of individual history samples value;
The estimated value of this measurement point present flow rate is:
Figure 123488DEST_PATH_IMAGE007
Figure 427430DEST_PATH_IMAGE008
is the measured value of current sampling instant REF in the formula.
6. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 1, it is characterized in that: saidly judge the flowmeter duty whether normal processes is following;
The absolute undulate quantity of definition data on flows is:
Figure 702554DEST_PATH_IMAGE009
Wherein (r=1 ~ M) for to begin, to length the data on flows sequence of M by the some cycles continuous acquisition from current time; R is an integer, represents the sequence number of sampled value, MLength for sample sequence;
During the flowmeter operate as normal VThe minimum of variation range and maximum statistical value do
Figure 743508DEST_PATH_IMAGE011
With
During as , then think this flowmeter communication disruption;
During as
Figure 170926DEST_PATH_IMAGE014
, then think this flowmeter fault.
7. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 1, it is characterized in that: judge whether to exist the process of abnormal data and removal following:
If the measured value of t sampling instant is
Figure 4889DEST_PATH_IMAGE015
, then normal
Figure 955528DEST_PATH_IMAGE015
should meet the following conditions:
i)?
Figure 900350DEST_PATH_IMAGE016
;
ii)?
Figure 252834DEST_PATH_IMAGE017
；
In the formula,
Figure 257699DEST_PATH_IMAGE018
,
Figure 695634DEST_PATH_IMAGE019
represent the minimum and maximum value that this measurement point steam flow can reach respectively in technological design;
Figure 178568DEST_PATH_IMAGE020
representes the sampling period;
Figure 713454DEST_PATH_IMAGE021
is illustrated in the maximum possible rate of change of steam flow in the sampling period;
Be
Figure 826904DEST_PATH_IMAGE015
i that do not satisfy condition simultaneously like measured value), ii); Then think exceptional value; This measuring point data is removed, and substituted current measurement data with the measurement data in the previous moment.
8. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 1, it is characterized in that being accumulate to an authentication period to carry out verification process following with removing data on flows behind the abnormal data:
The data on flows of judging accumulation is from vapour source or user, if from the vapour source, then authentication method is following:
Adopt formula
Figure 814451DEST_PATH_IMAGE022
that the integrated flux that the vapour source produces is carried out authentication; Obtain flow authentication value
Figure 38759DEST_PATH_IMAGE023
;
Figure 165503DEST_PATH_IMAGE024
=1 ~ m (steam source adds up to m in the pipe network) in the formula, the numbering in expression vapour source;
Where,
Figure 449854DEST_PATH_IMAGE025
, ,
Figure 952696DEST_PATH_IMAGE027
denote steam source in a certification cycle, add water, cumulative flow, the device itself for use or consumption flow and diffuse the cumulative flow;
Figure 196596DEST_PATH_IMAGE028
,
Figure 448585DEST_PATH_IMAGE029
,
Figure 348408DEST_PATH_IMAGE030
These three were the actual flow of steam flow correction factor.
9. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 8, it is characterized in that:
To some situation that steel enterprise does not have
Figure 976836DEST_PATH_IMAGE026
,
Figure 278504DEST_PATH_IMAGE027
measures, adopt the experimental formula estimation:
Figure 701395DEST_PATH_IMAGE031
Figure 88514DEST_PATH_IMAGE032
,
Figure 473545DEST_PATH_IMAGE034
are respectively the instant flow of two kinds of situation in the formula,
Figure 270600DEST_PATH_IMAGE035
,
Figure 938823DEST_PATH_IMAGE036
be respectively the time that continues at this metering section;
Figure 112315DEST_PATH_IMAGE037
is respectively the flow formula calculation constant, and P is the gauge pressure in vapour source.
10. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 8, it is characterized in that: as the accumulation data on flows from the user, then authentication method is following:
If this measuring point is b user (b=1 ~ n of steam pipe system; The steam total number of users is n in the pipe network); Total p of this user uses the vapour point, and each uses the flow measurements of vapour point is
Figure 185313DEST_PATH_IMAGE038
(j=1,2;, p)
Figure 153269DEST_PATH_IMAGE039
In the formula;
Figure 311718DEST_PATH_IMAGE040
(j=1; 2;, p) expression is respectively with the flow correction coefficient after the vapour point consideration loss.
11., it is characterized in that by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 10:
If sub-metering is inaccurate or when not having sub-metering, adopt following method validation at all:
Figure 85639DEST_PATH_IMAGE041
Figure 950827DEST_PATH_IMAGE042
representative should be used to produce e (e=1 with the vapour point in the formula; 2; Q) quantity of kind product, the quantity of steam that the e kind product of the every production unit quantity of representative consumes.
12. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 1; It is characterized in that: the data and the verify data of accumulation are compared; If there is significant difference in the two, then non intelligent flowmeter error is carried out trimming process and is:
There is the situation identification of directional bias:
As
Figure 735429DEST_PATH_IMAGE044
; And the difference of measured value and authentication value is always greater than zero or less than zero the time; Think and have directional bias; U=1 ~ n+m in the formula, the outer contact numbering of expression steam pipe system; Be the accumulated value of the measured value of u outer contact an authentication period,
Figure 47462DEST_PATH_IMAGE045
is the authentication value of this node flow accumulated value;
The method of estimation of directional bias Wu:
Suppose u the continuous H of a node CMA cycle T to pipe network; Measured value is
Figure 32736DEST_PATH_IMAGE046
; Authentication value is
Figure 404811DEST_PATH_IMAGE047
; H=1; 2 ..., H
Figure 537852DEST_PATH_IMAGE048
The accumulated value of this flow after secondary is proofreaied and correct is:
Figure 591259DEST_PATH_IMAGE049
.
13. by the described iron and steel enterprise's steam pipe system continuous data method of correcting that is applicable to of claim 1, it is characterized in that: to carry out the fine correction process following according to producing method that the consumption balance coordinates through data to the data on flows after proofreading and correct:
1), and forms incidence matrix with outer contact numbering A
　A＝（1,...,-1,…）；
A is a number equal to the total number of steam source m; -1 point number equal to the total number of steam n; 2) empirically determined loss per hour of steam pipe network
Figure 496285DEST_PATH_IMAGE050
, and the total loss
Figure 976945DEST_PATH_IMAGE051
:
Figure 331703DEST_PATH_IMAGE052
, TBe authentication period;
3) data are coordinated:
31) establish each outer contact flow measurements of steam pipe system be X (u, y), unit: the ton/hour;
U=1 ~ m+n, the outer contact numbering of steam pipe system; Y=1 ~ Z represents y measured value in the metering cycle, and each authentication period is measured Z time;
If instrument fault or the exceptional value situation occurs is pressed preceding method and is handled the back and substitute measured value with estimated value;
32) calculate the instant flow sample average of the outer contact of u
Figure 188801DEST_PATH_IMAGE053
Figure 945404DEST_PATH_IMAGE054
33) calculate in the metering cycle integrated flux of steam pipe system u outer contact:
Figure 596965DEST_PATH_IMAGE055
In the formula TsBe traffic sampling cycle, unit hour; If authentication is not passed through, then proofread and correct integrated flux and substitute this value with the secondary after the authentication;
Remember
Figure 704599DEST_PATH_IMAGE056
and be the cumulative flow value vector after the secondary correction;
Note
Figure 162125DEST_PATH_IMAGE057
is the flow vector after coordinating through data:
The objective function that fetches data and coordinate:
Figure 710918DEST_PATH_IMAGE058
Constraint condition is:
Figure 861277DEST_PATH_IMAGE059
Get weighting matrix:
In the formula:
Figure 389527DEST_PATH_IMAGE061
, R (u) is the precision of the measurement of u flowmeter;
34) flow totalizer volume production consumption difference d:
35) Calculation
Figure 114086DEST_PATH_IMAGE063
matrix:
Figure 927803DEST_PATH_IMAGE064
36) calculate Lagrange multiplier battle array K:
Figure 664815DEST_PATH_IMAGE065
37) Coordination residual matrix calculations
Figure 250517DEST_PATH_IMAGE066
:
Figure 680361DEST_PATH_IMAGE067
38) After calculating coordinate data flow
Figure 718724DEST_PATH_IMAGE068
:?
Figure 259427DEST_PATH_IMAGE069
The data coordination value of trying to achieve is carried out boundary value verification and equation of constraint verification: verification is not passed through like boundary value, then resets weight matrices; As reset and to pass through, then authentication flow and pipe network waste again.
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