CN101625256B - Intelligent correction method for under-pressure weighing - Google Patents
Intelligent correction method for under-pressure weighing Download PDFInfo
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- CN101625256B CN101625256B CN2008100699608A CN200810069960A CN101625256B CN 101625256 B CN101625256 B CN 101625256B CN 2008100699608 A CN2008100699608 A CN 2008100699608A CN 200810069960 A CN200810069960 A CN 200810069960A CN 101625256 B CN101625256 B CN 101625256B
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Abstract
The invention belongs to the technical field of physical automatic control, and discloses a novel intelligent correction method for under-pressure weighing. By detecting parameter variation during pressurization, the corresponding change values of in-tank pressure P and the weight WP of a weighed added part are recorded; an appropriate P-WP fitting curve equation is found out by adopting the principle of an error least-square method; the equation represents a specific detected tank body; in the working state of the current pressurization, a function expression between the in-tank pressure P and the 'the sum of pressurized gas weight and complex mechanical external force' WP is WP = F(P), and is substituted into a pressurization-container under-pressure weighing whole-course dynamic equilibrium expression: WO = WI-WP-WZ; and the weight of materials in a pressurization tank at a certain moment after correction is obtained through calculation. The method applies to blast furnace top discharge, pulverized coal injection, desulfurization and desilication in the steel industry, as well as the fields of electric power and chemical engineering, and can also apply to places where weighing has change caused by the influence of mechanical external force, such as wind load calculation, in-tank pressure changed through chemical reaction, and the like.
Description
Technical field
The invention belongs to technical field of physical automatic control, disclose a kind of band and pressed the intelligent correction method of weighing.
Background technology
Regular meeting runs in the time of in the production operation process, the material in the airtight container under normal conditions weighing weight and airtight after to carry out the weight that pressurising obtains again inequality, some special occasions difference is also very obvious.This is difficult to know after a period of time is carried out in discharging work also remain how many materials for having discharging monitoring, the operation of pressing under the duty to cause great inconvenience actually, can't accurately judge the terminal point of discharging---material dummy status especially.
The reason that causes is concluded main cause three:
1) enters the weight that the body self of calming the anger is arranged in the jar in the pressurising process.Under single material and pressurising medium operating mode, be as the modified computing formulae of employings such as desiliconization of hot metal, hot metal in steelmaking desulfurization, breeze blowing:
Q
Ac---certain is coal dust weight (kg) in the jar through revising after constantly;
Q
a---be by meausring apparatus claim the weight of coal dust in a certain moment jar;
P
a---the gauge pressure (bar) of certain jar of jetting is constantly recorded by tensimeter;
t
a---certain jar interior nitrogen temperature of jetting constantly (℃), record by thermometer;
V---winding-up tank volume (m
3);
ρ
c---the real density of coal dust, ρ
c=1300kg/m
3
ρ
N2---the density of nitrogen under the mark condition, ρ
N2=1.25kg/m
3
Analyze the back and understand this formula: temperature, the pressure surge influence of gas in having eliminated jar, need after pressurising is finished to have considered the shared volume of material in the deduction jar before having the weight of the body self of calming the anger to calculate.But regrettably, do not comprise the mechanical external force computational item in the formula, even therefore in many occasions, adopted this correction formula, yet imperceptible obvious effects.
2) because after jar internal pressure rising, when material inlet dome valve (seal valve) had leakage situation to occur, the body of calming the anger was crossed dome valve and is entered the blanking pipeline, and pressure is acted directly on the wafer type butterfly valve plate, saw Fig. 1.Because its butterfly valve links to each other with feeding bin and is subjected to rigid constraint, the distortion that can not move up, the reacting force that applies downwards is delivered on the tank body on the contrary, makes the weighing value sharply rise.
At mixture and multiple pressurising medium, as the blast furnace furnace roof etc., employing be: according to lower seal valve port footpath and high furnace pressure measured value, calculate the correcting mode of reacting force on the lower seal valve valve plate.In producing discharge process, the reacting force numerical value that deduction bears from actual weighing value.The correction of this kind mode the part mechanical external force, in actual use blast furnace furnace roof material weighing accuracy is had greatly improved.But in the face of the actual working state that varies, only calculated a mode that external force is revised, rather than the mechanical external force summation of considering, also all do not eliminate the weight influence factor of pressurized gas, the body leakage rate of calming the anger simultaneously also may be that part is not 100%, and practicality still has limitation.
The iron and steel enterprise that has in addition recognizes the problem of these current appearance, look for another way and adopt the actual measurement revised law, promptly regularly slack tank is carried out pressurising repeatedly, record obtains the slack tank recruitment of on average weighing and stores as modified value, this value of subduction after each pressurising during real work.This value has comprised calm the anger body weight and mechanical external force, at specific tank body, revises accuracy rate and improves.But test mode and actual working state have very big difference, as the working pressure range of breeze blowing jar between 0.5～1.2MPa, test can only obtain the quantitatively modified value of a bit, and how does this get force value? and this also is one and carries out the static modification mode by the off-line value of obtaining after all.
3) owing to the various technologies that are connected with tank body after the pressurising, detect the phenomenon that " hardening " can appear in pipeline, still see Fig. 1.Even corrugated flexible hose under the normality also can conduct the external force of various levels or inclination this moment.When a plurality of power act on the tank body simultaneously, and during by the tank body center line, rotary torque can occur, act on and also can produce the weighing value on the meausring apparatus sensor big variation takes place.Temporarily also do not seek suitable method at present and calculate, have only from mechanical setting angle and make great efforts to slow down influence.
The comprehensive external force that the mechanical realization aspect causes, mainly be to be subjected to machinery and weighing equipment mounting condition, various valves idol has leakage, the line size that is connected with tank body, quantity, residing physical location, and pressurized can weight transmitting supporting way, deformation constrain condition or the like.
Each pressurized can certainly all has difference on its details, therefore quantitative theory is calculated each external force value to integrate or apply mechanically a certain empirical value more all be impossibility respectively.
Owing to be applied " pressurized gas weight and complicated machinery external force summation " in the actual weighing value that obtains of pressurising container weighing process, and it is still changing along with the difference of external condition, cause actual weighing value can not accurately reflect the true nt wt net weight of material in the pressurising container, need manually estimation by rule of thumb when making the discharging operation.When needs are emptied completely material, has only the proper extension discharging time; And suitably shorten the discharging time need leave certain bed material the time.Not only increase the probability of maloperation, also reduced the utilization ratio of equipment.Contradiction is particularly outstanding running under the emergency operation situation.
Summary of the invention
The present invention proposes a kind of band and presses the intelligent correction method of weighing.The present invention is initial in terminal procedure by pressurising, segmentation detects, record jar internal pressure P increases the corresponding changing value of weight W P partly with weighing, write down one group of P-WP variation relation data set, adopt error least squares method principle to find out its suitable P-WP matched curve equation then, convert data set to pressure and weight change relation equation expression formula:
WP＝F
(P)
It represents certain specific detected tank body, and under this pressurising duty, the function between the jar internal pressure P that makes to measure specially and " pressurized gas weight and complicated machinery external force summation " WP is expressed.Variable is a pressure P in the formula, and dependent variable is corresponding weight change value WP.
According to a large amount of on-site collection data,, proposed pressurising container band and pressed omnidistance mobile equilibrium expression formula: the WI=WO+WP+WZ that weighs in conjunction with the physics Analysis on Mechanism
Conversion obtains: WO=WI-WP-WZ
In the formula: WI relies on weighing to obtain, and WP is the matched curve equation, and WZ calculates by the material fall off rate.
WO---certain is weight of material (thinking normality material net weight) in the pressurized can after revising constantly;
WI---be by meausring apparatus claim the weigh of material in a certain moment pressurized can, i.e. weighing value;
WP---pressurising initial in the terminal procedure weighing increase the weight (thinking pressurized gas weight and complicated machinery external force summation) of part;
WZ---in the tank body discharge process, the volume that material is vacateed after discharging is by the newly-increased gas weight that has the body of calming the anger to insert;
P---certain is the interior meter pressure of pressurized can constantly.
The present invention is applicable to the discharging of steel industry blast furnace furnace roof, breeze blowing, desulfurization, desiliconization etc., and electric power, chemical field.As a kind of bottom technology, also applicable to the mechanical external force influence is arranged, cause weighing the place that changes to occur, change aspects such as jar internal pressure as wind load calculating, chemical reaction.
Description of drawings
Fig. 1 pressurising winding-up jar fundamental diagram
Fig. 2 band of the present invention is pressed the intelligent correction method block diagram of weighing
Fig. 3 error least squares method P-WP match concerns profile
Fig. 4 pressurising process of the present invention material weighing weight and pressure variation relation curve
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing:
Press the intelligent correction method block diagram 2 of weighing according to band of the present invention, it is initial in terminal procedure by pressurising that band is pressed the intelligent correcting mode of weighing, segmentation detects, record jar internal pressure P increases the corresponding changing value of weight W P partly with weighing, write down one group of P-WP variation relation data set, adopt error least squares method principle to find out its suitable P-WP matched curve equation then, that is to say to convert data set to pressure and weight change relation equation expression formula, obtain once a coefficient k value and b.It represents certain specific detected tank body, under this pressurising duty, and the function expression WP=F between jar internal pressure P and " pressurized gas weight and complicated machinery external force summation " WP
(P)Variable is a pressure P in the formula, and dependent variable is corresponding weight change value WP.So far the right side variable all can obtain expressing by number of ways in the pressurising container weighing process weight mobile equilibrium expression transformation formula.
Illustrate: material design maximum weight 20 in jar, 400kg.
Pt05501c＝[00.019671 0.044560 0.068866 0.094329 0.1247110.144676 0.168981 0.195602 0.274306 0.298032 0.328993 0.3478010.376736 0.398727 0.421586 0.447017 0.474537 0.505787 0.5462960.582755 0.5999537 0.627315 0.650463 0.676505]；
Wt05502c＝[9.279875 9.412087 9.507567 9.603047 9.6985389.889509 9.985000 10.080480 10.175960 10.462422 10.55791310.653393 10.844375 10.939855 11.035335 11.130826 11.32180811.417299 11.512779 11.656010 11.799230 11.894721 11.99021212.085692 12.276663]。
Test figure: k=4.310472 b=9.316966
Obtain error least squares method P-WP match and concern profile Fig. 3.
Material weighing weight and pressure variation relation in the winding-up jar are decomposed and redefine, obtain pressurising process material weighing weight and pressure variation relation curve map 4.
In the pressurising container band pressure discharge process, material net weight WO is in continuous decline certainly; Weighing value WI trend also is in continuous decline; Pressurized gas weight and complicated machinery external force summation WP mainly are along with the pressure P in the jar constantly changes, and might increase also to reduce; Newly-increased gas weight WZ is in continuous increase, till the body of calming the anger is full of tank body.
The P-WP matched curve single order linear function equation that adopts error least squares method principle to find out:
Y
*=b+kX; B wherein: be initial weight of material before the pressurising
Jar internal pressure P and weighing increase the function expression WP=F between the weight W P partly
(P)Be described as at this example:
WP＝kP＝4.310472xP(MPa)
Write out pressurising container weighing process mobile equilibrium expression formula:
A-material discharging fall off rate, relevant with the WO rate of change, span is between 1～0;
T-is the interior measurement temperature of pressurized can constantly;
ρ
NThe volume that-material is vacateed after discharging is by the newly-increased gas mark condition density that has the body of calming the anger to insert.
This correction compute mode is calculated and intelligence correction eliminates " pressurized gas weight and complicated machinery external force summation " to the stack interference of pressure vessel material weighing is arranged.
Rise to 6.76505kg/cm as working as a jar interior working pressure P in the example
2The time,
WP＝4.310472P＝4.310472×0.676505＝2.916t＝2,916kg。
Band presses the intelligence correction arithmetical unit of weighing to be furnished with a small amount of I/O interface, estimates to prepare to use the signal that needs to define to have:
AI:WI---be by meausring apparatus claim the weigh of material in a certain moment jar, i.e. weighing value;
P---gauge pressure detected value in certain container of pressurising constantly;
T---temperature detection value in certain container of pressurising constantly.
AO:WO---certain is weight of material (thinking material net weight under the normality) in the pressurising container after the weighing process correction constantly.
DI:STA---pressurising commencing signal;
END---pressurising end signal.
DO:ANN1---weighing process correction computing end signal;
ANN2---weighing process correction computing abnormal alarm signal;
Material spacing wave in ANN3---the pressurising container;
ANN4---weighing process correction arithmetical unit fault-signal.
P-WP matched curve equation, i.e. function expression WP=F between jar internal pressure P and " pressurized gas weight and complicated machinery external force summation " WP
(P)Data analysis can be adopted single order linear function equation by experiment, also can adopt second order and index curve functional equation, both errors were more or less the same in the pressurising starting stage (jar internal pressure P is little), can progressively increase in pressurising ending phase (jar internal pressure P is big) error, can select suitable matched curve equation form according to pressure range.
The present invention has following advantage:
1) this revised law " pressurized gas weight and the complicated machinery external force summation " that will pass by at all can't detect is incorporated in the pressurising container omnidistance dynamic equilibrium expression formula of weighing with pressure with P-WP matched curve equation form. Calculate that also intelligence correction eliminates " pressurized gas weight and complicated machinery external force summation " to the stack interference of pressure vessel material weighing is arranged. The only revisal pressurized gas weight that previous method has, the theory that a certain external force is carried out that has is calculated rear the correction; This method is Promethean have been remedied other and weighs and revise the concept introducing left shortcoming that computing can't " summation ". Rise to 6.76505kg/cm as working as the pressure P of working in the tank2The time,
Static error analysis when the WP pressurising finishes: (12.276663-9.316966)-2.916=43.7kg (counting 4.7 ‰).
2) extremely superior ageing, revising each time the computing data all is from a certain specific detected tank body, under this pressurising work state, make specially weighing of getting to measure and revise the computing formula, any small accidental extraneous machinery or change in process that takes place all will in time be embodied.
3) principle is simple, and is applied widely. Can be used on positive pressurising container weighing process, also can be used for negative pressure of vacuum container weighing process; Introduce temperature, the pressure correction factor, also be suitable for tank body discharge process in the bigger occasion of temperature and pressure fluctuation.
4) the pressurising initial gas can be blending agent. Because P-WP matched curve equation is and the variable quantity of weighing value has relation, what monitor is to change gross weight WP, and irrelevant with fill gas volume density (also being exactly pressurized gas kind and mixing ratio), once all press employing blast furnace coal gas such as the blast furnace furnace roof, secondary is all pressed employing nitrogen. In sum, originally weigh in theory and revise the computing formula and be applicable to material metage process in any Pressure Vessel.
5) extension by expression formula WP is made progress can calculate continue the to rise situation of terminal pressure value when being higher than pressurising and finishing of the pressure of working in the tank body discharge process equally. During such as breeze blowing work process, can continue pressurising, but can't rush down pressure, pressure when causing breeze blowing tank internal pressure to be much higher than pressurising, this moment is the measurable WP that calculates still.
6) real Real-time and Dynamic Detection, online computing model. Adopted and calculated the substepization processing, weighing value reading manner behind the first pressure, detection value value is sieved again rejecting value technology; Last time, the residual error multistep was reduced technology. In the certain situation of outside meausring apparatus system's precision and signal resolution, guarantee that improving weighs as far as possible to revise computing model calculation accuracy also possess certain ability of resisting interference.
The intelligent revised law of weighing with pressure comprises in fact Real-time and Dynamic Detection, online computing model and required hardware device. It is small-sized independently on-the-spot or dish (cabinet) installing is standby that it both can be configured to a cover, also the mode of computing model with software can be embedded in the relevant automation control system. Even and the complete formation electromechanical integrated product of LOAD CELLS.
The present invention is applicable to the discharging of steel industry blast furnace furnace roof, breeze blowing, desulfurization, desiliconization etc., and electric power, chemical field. As a kind of Floor layer Technology, also applicable in the mechanical external force impact is arranged, cause weighing the place that changes to occur, change the aspects such as tank internal pressure such as wind load calculating, chemical reaction.
Claims (6)
1. a band is pressed the intelligent correction method of weighing, it is characterized in that: initial in terminal procedure by pressurising, segmentation detects, record jar internal pressure P increases the corresponding changing value of weight W P partly with weighing, write down one group of P-WP variation relation data set, adopt error least squares method principle to find out its suitable P-WP matched curve equation then, convert data set to pressure and weight change relation equation expression formula:
WP＝F
(P)
It represents certain specific detected tank body, and under this pressurising duty, the function between jar internal pressure P and " pressurized gas weight and complicated machinery external force summation " WP is expressed, and variable is a jar internal pressure P in the formula, and dependent variable is corresponding weight change value WP; Pressurising container band is pressed the omnidistance mobile equilibrium expression formula of weighing:
WO＝WI-WP-WZ
WO-constantly after revising in the pressurized can weight of material promptly think normality material net weight;
WI-be by meausring apparatus claim the weigh of material in a certain moment pressurized can, i.e. weighing value;
The initial weight that weighing increases part in the terminal procedure of WP-pressurising is promptly thought pressurized gas weight and complicated machinery external force summation;
In the WZ-tank body discharge process, the volume that material is vacateed after discharging is by the newly-increased gas weight that has the body of calming the anger to insert;
P-jar internal pressure.
2. band according to claim 1 is pressed the intelligent correction method of weighing, and it is characterized in that: P-WP matched curve equation, i.e. function expression WP=F between jar internal pressure P and " pressurized gas weight and complicated machinery external force summation " WP
(P), adopt single order linear function equation to analyze experimental data.
3. band according to claim 1 is pressed the intelligent correction method of weighing, and it is characterized in that: P-WP matched curve equation, i.e. function expression WP=F between jar internal pressure P and " pressurized gas weight and complicated machinery external force summation " WP
(P), adopt second order and index curve functional equation to analyze experimental data.
4. band according to claim 1 is pressed the intelligent correction method of weighing, it is characterized in that: Real-time and Dynamic Detection, on-line operation model and required hardware device, be configured to a cover independently band press the intelligence of weighing to revise arithmetical unit to be placed in scene or pulpit dish, cabinet and the operator's console.
5. band according to claim 4 is pressed the intelligent correction method of weighing, and it is characterized in that: band presses the intelligence of weighing to revise arithmetical unit and the complete formation electromechanical integrated product of LOAD CELLS.
6. band according to claim 4 is pressed the intelligent correction method of weighing, and it is characterized in that: will band press the intelligence correction operational model of weighing to be embedded in the relevant automation control system in the mode of software module.
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Families Citing this family (6)
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| CN101985669B (en) * | 2010-11-18 | 2012-05-23 | 中冶南方工程技术有限公司 | Method for automatically correcting differential-pressure compensation factors of weighing of top charging bucket |
| CN102559966B (en) * | 2012-02-28 | 2014-04-09 | 中冶南方工程技术有限公司 | Charging bucket weighing differential pressure compensation method for serial bell-less furnace top |
| CN104444383B (en) * | 2014-12-02 | 2017-01-11 | 新奥科技发展有限公司 | High-pressure dense-phase transportation metering method and device |
| CN108255786B (en) * | 2017-11-28 | 2021-07-16 | 中南大学 | Method and system for calculating interference compensation of weighing result |
| CN109648714B (en) * | 2019-01-28 | 2019-08-06 | 河南三和水工机械有限公司 | A method of the additive accurate weighing for environment-friendly dry mortar facilities of mix storied building |
| CN111256802A (en) * | 2020-03-24 | 2020-06-09 | 深圳市润农科技有限公司 | Calibration method of weighing device and weighing device |
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| CN100351349C (en) * | 2005-12-23 | 2007-11-28 | 李园 | Control method for powdered coal pressure and transferring program for powdered coal gasification |
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Effective date of registration: 20190529 Address after: 400013 No. 1, Shuang Steel Road, Yuzhong District, Chongqing, China Co-patentee after: CISDI CHONGQING INFORMATION TECHNOLOGY Co.,Ltd. Patentee after: CISDI ENGINEERING Co.,Ltd. Address before: 400013 No. 1, Shuang Steel Road, Yuzhong District, Chongqing, China Patentee before: CISDI ENGINEERING Co.,Ltd. |
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Address after: 400013 No. 1, Shuang Steel Road, Yuzhong District, Chongqing, China Patentee after: CISDI ENGINEERING Co.,Ltd. Patentee after: MCC CCID information technology (Chongqing) Co.,Ltd. Address before: 400013 No. 1, Shuang Steel Road, Yuzhong District, Chongqing, China Patentee before: CISDI ENGINEERING Co.,Ltd. Patentee before: CISDI CHONGQING INFORMATION TECHNOLOGY Co.,Ltd. |