CN107861911A - A kind of coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method - Google Patents

A kind of coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method Download PDF

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CN107861911A
CN107861911A CN201711050194.6A CN201711050194A CN107861911A CN 107861911 A CN107861911 A CN 107861911A CN 201711050194 A CN201711050194 A CN 201711050194A CN 107861911 A CN107861911 A CN 107861911A
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mrow
msub
flue
coal
flue gas
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史元浩
庞晓琼
温杰
崔方舒
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North University of China
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North University of China
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10Complex mathematical operations
    • G06F17/11Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/10Geometric CAD
    • G06F30/17Mechanical parametric or variational design
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/08Thermal analysis or thermal optimisation

Abstract

The invention discloses a kind of coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method, on the basis of unit actual operating data, since being entered afterbody twin flue, tail flue gas baffle plate come out to air preheater untill this section of flue a series of heating surfaces using fume side to working medium side dynamic power and mass balance, the flue gas flow of two side flues is calculated by the method for hard measurement, benchmark flue gas physical parameter is corrected using the industrial data of daily ature of coal simultaneously, the final real-time soft measuring realized to afterbody twin flue flue gas flow.

Description

A kind of coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method
Technical field
The present invention relates to a kind of flue gas flow measuring method, and in particular to a kind of coal-fired power station boiler afterbody twin flue flue gas Flow online soft sensor method, belongs to electric power and technical field of information processing.
Background technology
Since 21st century, energy-conservation and environmentally friendly ever more important.Coal-fired firepower power station, which is used as, is related to that state of China counts The major power consumer of the people's livelihood, how to reduce energy resource consumption as far as possible on the basis of ensureing to keep the safety in production, reduced discharge One through facing as it very urgent problems.
Boiler is one of key equipment of coal fired power plant, and the key object of whole power station energy-saving and emission-reduction.No matter take Which kind of means carries out energy-saving and emission-reduction optimization to boiler, and the accurate measurements to boiler entirety operating mode are important prerequisites, among these flue gas Flow is wherein to need one of variable for monitoring.The existing coal fired power plant in China wherein quite a few boiler is using the double cigarettes of afterbody Road is designed, and flue gas flow is adjusted the gas baffle of two side flues, and its main purpose is reached by the regulation to exhaust gas volumn To the adjustment effect to reheater steam temperature.The flue gas ratio of afterbody twin flue is designed in advance, but due to actual work The influence of the factor such as the complexity of condition, smoke components, flue gas flow rate, the actual flue gas flow of twin flue are not to abide by always Follow ratio.The real-time flue gas of two side flues must then be obtained by carrying out monitoring in real time to the heating surface working condition of two side flues Flow.
It is to use flue gas flow meter to measure flue gas flow conventional method, is previously installed at accordingly in boiler design erection stage Position, or measured in experimental stage using measuring instrument in reserved measurement point.But much use afterbody in China The boiler back end ductwork of twin flue design is not pre-designed or reserved measuring point, and which results in can not direct measurement acquisition tail The real-time flue gas flow of the side flue of portion two, difficulty is caused to the real-time calculation of thermodynamics of both sides heating surface.Such as set according to realization The ratio of meter is then not accurate enough to be allocated to flue gas flow, for some controls higher to required precision and optimization method Then it is unable to reach requirement.Conventional method is that the distribution of flue gas flow is judged according to the opening information of both sides gas baffle, so And because pressure loss coefficient is difficult to obtain, and after long-time produces, gas baffle becomes seal not due to degrading for flue gas Good and opening information is inaccurate, thus this method can not use in actual field.
Found through being retrieved to existing literature, Chinese patent ZL201210046212.4 proposes a kind of " contain based on detection oxygen The plug-in smoke gas flow-measuring method and measurement apparatus of amount ", this method are each from data processing equipment input input fuel Constituent content and fuel flow rate, the theoretical air ratio and theoretical flue gas ratio and theoretical air requirement and theory of the fuel is calculated Exhaust gas volumn;Detect to obtain the oxygen content in flue gas by oxygen content detector measuring probe, finally calculate actual flue gas stream Amount.This method still needs oxygen content detection probe, and the oxygen content of many afterbody double-flue boilers in China probe is in twin flue Afterbody, can not entirely accurate reflection flue in integral status, for the targeted afterbody twin flue of present patent application There is certain limitation for the detection of flue gas flow.
" measurement model of boiler back end ductwork flue gas mass flow " that Wang Jianguo et al. is proposed is with calculation of thermodynamic equilibrium Based on, by the way of industrial computer and harvester are combined, realize to tubular air preheater flue gas mass flow Measurement.This method is mainly for the calculating of flue gas mass flow, the pot calculated for the larger unit this method of coal-fired fluctuation There is certain deviation for the efficiency of furnace and actual value, it is impossible to meets the requirement of a more accurately higher step.
The content of the invention
To solve the deficiencies in the prior art, it is an object of the invention to provide a kind of based on dynamic power and mass balance Coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method, on the basis of unit actual operating data, from entering Enter afterbody twin flue to start, tail flue gas baffle plate come out to air preheater untill this section of flue a series of heating surfaces use Fume side is counted to the dynamic power and mass balance of working medium side by the method for hard measurement to the flue gas flow of two side flues Calculate, while benchmark flue gas physical parameter is corrected using the industrial data of daily ature of coal, finally realize to afterbody twin flue The real-time soft measuring of flue gas flow.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that:
A kind of coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method, it is characterised in that including following Step:
The first step:The coal-fired composition and characteristic of benchmark are determined according to power station actual conditions;The fixed sampling time is chosen, is led to Cross OPC communications protocol and obtain boiler operatiopn related data in real time;
Second step:Based on flue gas physical characteristic, according to the coal-fired composition of the benchmark determined in the first step, it is coal-fired to calculate 1kg Every characteristic of product after burning, and establish the benchmark flue gas Data Base of Chemical Compound of boiler;By water and steam thermodynamic properties The vectorization of IAPWS-IF97 formula is used for the real-time calculating of working medium enthalpy;
3rd step:The boiler operatiopn related data got to the first step carries out bad point processing and data smoothing processing, from And the real-time data base of the related operational factor of the boiler tail flue after being handled;
4th step:The fume side and working medium side established before and after the boiler tail both sides economizer based on quality and energy balance Equilibrium equation, represented with equation below:
mlΔHl+mrΔHr=Qsm (2)
ml+mr=mtotal
In formula, ml、mrAnd mtotalRespectively tail vertical well gas flue left side, right side and total flue gas mass flow, kg/s;
ΔHlWith Δ HrThe enthalpy change of unit mass flue gas, kJ/kg respectively in the flue of the left and right sides;
QsmThe heat absorbed for working medium in the economizer of boiler tail flue both sides, kJ/s;
5th step:Above-mentioned equilibrium equation, amendment are corrected according to the accumulation of heat in working medium under temperature change and metal heated face change Economizer energy and mass balance equation afterwards is represented with equation below:
Q′sm=Qsm+ΔQq+ΔQj (3)
In formula, Q 'smThe heat absorbed for working medium in the economizer of revised boiler tail flue both sides, kJ/s;
ΔQqFor working medium accumulation of heat variable quantity, kJ/kg;
ΔQjFor heating surface metal accumulation of heat variable quantity, kJ/kg;
6th step:According to the benchmark chemical composition that the Industrial Analysis Data correction of fire coal is coal-fired;
7th step:On the basis of coal-fired chemical analysis value after the correction obtained by the 6th step, two side flues are obtained from measuring point The temperature of flue gas, pressure, flow, the related data of Temperature of Working and pressure flow, with reference to formula (2) and formula (3) simultaneous Try to achieve the flue gas flow of two side flues:
Foregoing coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method, it is characterised in that first In step, the sampling time is 5 seconds.
Foregoing coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method, it is characterised in that the 3rd In step, the method being fitted is slided to judge bad point by multinomial, and it is rejected.
Foregoing coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method, it is characterised in that the 3rd In step, data are smoothed by the method for data weighting filtering, are specifically:
In formula,For filtered data;
yiFor the actual measured value at i moment, i=m-3, m-2, m-1, m, m+1, m+2, m+3.
Foregoing coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method, it is characterised in that the 6th In step, correct coal-fired benchmark chemical composition and use following updating formula:
In formula, Xi,arFor calculating carbon, hydrogen, oxygen, nitrogen, element sulphur constituent analysis, %;
For the carbon of season chemical examination, hydrogen, oxygen, nitrogen, element sulphur constituent analysis a reference value, %;
WarFor Analysis Values, base moisture, %;
AarFor Analysis Values, base ash content, %;
For the moisture as received coal of season chemical examination, %;
For the As-received ash content of season chemical examination, %.
The present invention is advantageous in that:
(1) online soft sensor method provided by the invention, coal-fired power station boiler afterbody can be accurately measured in real time Twin flue flue gas flow, there is good dynamic characteristic, while extra measuring instrument need not be installed, have preferably general Property and robustness, real-time monitoring suitable for coal-fired thermal power generation boiler back-end ductwork characteristic parameter and on this basis excellent Change adjustment;
(2) online soft sensor method provided by the invention, real-time amendment has been carried out to energy-balance equation, it is contemplated that operating mode Heating surface metal and working medium accumulation of heat change in the case of fluctuation, improve the dynamic accuracy of method;
(3) online soft sensor method provided by the invention, approach fire coal chemical composition is corrected, it is not necessary to expensive Certain precision can be ensured while the input of in-line analyzer;
(4) measurement result of online soft sensor method provided by the invention helps to carry out more boiler back end ductwork operating mode The good overall energy-saving and emission-reduction optimal control that is evaluated as provides support.
Brief description of the drawings
Fig. 1 is coal-fired power station boiler afterbody twin flue structural representation;
Fig. 2 is left side flue gas flow shares figure.
Embodiment
Make specific introduce to the present invention below in conjunction with the drawings and specific embodiments.
Part I:Boiler
Boiler involved in the present invention is, it is necessary to meet following condition:
(1) load 300MW, use is subcritical, Natural Circulation, a resuperheat, the single burner hearth of double arches, " W " flame combustion Mode, afterbody twin flue, gas baffle temperature adjustment, balanced draft, dry ash extraction, outdoor arrangement, all steel frame suspension type drum boiler;
(2) hot-fluid is distributed along pipe range and even circumferential outside heat exchanger;
(3) exchanger tube wall metal only considers radially to exchange heat;
(4) intraductal working medium is incompressible, and parameter uniformity on flow section.
As a kind of preferable scheme, we use HG-1025/17.3-WM18 type boilers, the afterbody twin flue of the boiler Structural representation is as shown in Figure 1.
Part II:Twin flue flue gas flow online soft sensor method
The coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method of the present invention, it comprises the following steps:
The first step:
First, heat-transfer surface size and flue characteristic of the boiler tail flue including economizer are set, specifically such as the institute of table 1 Show.
The boiler physical characteristic parameter of table 1
Title Unit Numerical value
Economizer tube external diameter mm 51
Economizer tube internal diameter mm 44.5
Horizontal row (parallel transistor number) —— 356
Longitudinal row —— 8
Transverse pitch mm 115
Flue gas flow area m2 135.25
Steam circulation area m2 0.448
Surface heating surface area m2 2539
Wall tube material matter —— SA210C
Then, the coal-fired composition and characteristic of benchmark are determined according to power station actual conditions, it is specific as shown in table 2.
The power station fire coal representative basis composition of table 2 and characteristic
Finally, the fixed sampling time (sampling time is 5 seconds) is chosen, boiler DCS control systems carry OPC services End, boiler operatiopn related data is obtained by OPC communications protocol in real time.
Second step:
Based on flue gas physical characteristic, according to the coal-fired composition of the live benchmark determined in the first step, the coal-fired combustions of 1kg are calculated Every characteristic of product after burning, the enthalpy characteristic of each composition is fitted using high-order moment, establishes the benchmark flue gas thing of boiler Property database, calculated for follow-up flue gas enthalpy.
For the composition in flue gas:CO2、N2, air, the specific heat c of vapor and ash, with way of fitting into five Order polynomial calculates:
C=a0+a1t+a2t2+a3t3+a4t4+a5t5
In formula, a0、a1、a2、a3、a4、a5For fitting coefficient;
T is Temperature of Working, DEG C.
The fitting result of various pieces is shown in Table 3.
The flue gas of table 3 and air physical parameter calculation formula multinomial coefficient
Note:Gas volume refers both to standard state in table.
The enthalpy of working medium water and steam is tried to achieve according to international standard formula IAPWS-IF97.
3rd step:
The boiler operatiopn related data got to the first step carries out bad point processing and data smoothing processing, after processing The related operational parameter data deposit boiler operating parameter real-time data base of boiler tail flue.
1st, bad point is handled
The method being fitted is slided to judge bad point by multinomial, and it is rejected.
2nd, data smoothing is handled
Data are smoothed by the method for data weighting filtering, are specifically:
In formula,For filtered data;
yiFor the actual measured value at i moment, i=m-3, m-2, m-1, m, m+1, m+2, m+3.
4th step:
Based on quality and energy balance, the fume side and the quality of working medium side established before and after the economizer of boiler tail both sides and Energy-balance equation, the flue gas flow sum at left and right sides of back-end ductwork are equal to back-end ductwork and export total flue gas flow, save coal The heat of device flue gas release is equal to the heat that working medium absorbs, and is specifically represented with equation below:
mlΔHl+mrΔHr=Qsm (2)
ml+mr=mtotal
In formula, ml、mrAnd mtotalRespectively tail vertical well gas flue left side, right side and total flue gas mass flow, kg/s;
ΔHlWith Δ HrThe enthalpy change of unit mass flue gas, kJ/kg respectively in the flue of the left and right sides;
QsmThe heat absorbed for working medium in the economizer of boiler tail flue both sides, kJ/s.
5th step:
In the case of considering working conditions change, the change of metal heated face and the working medium amount of stored heat under temperature, pressure change, to the The energy-balance equation of four steps is modified, and obtains dynamic power equilibrium equation, revised economizer energy and mass balance Equation is represented with equation below:
Q′sm=Qsm+ΔQq+ΔQj (3)
In formula, Q 'smThe heat absorbed for working medium in the economizer of revised boiler tail flue both sides, kJ/s;
ΔQqFor working medium accumulation of heat variable quantity, kJ/kg;
ΔQjFor heating surface metal accumulation of heat variable quantity, kJ/kg.
Wherein, heating surface metal accumulation of heat variation delta QjFor:
Working medium (steam) accumulation of heat variation delta QqFor:
And steam side heat absorption is then:
Qsm=D (Hout-Hin)
In formula, Cj、CqThe respectively mean specific heat of metal and working medium, kJ/ (kgg DEG C);
mj、mqFor heating surface tube wall metal quality and the quality of Qi Nei working medium, kg;
θq、θjFor metal pipe-wall temperature and vapor (steam) temperature, DEG C;
D is the working medium mass flow for flowing through both sides economizer, kg/s;
Hout、HinRespectively economizer import and export working medium enthalpy, kJ/kg;
τ is the time.
6th step:
According to the benchmark chemical composition that the Industrial Analysis Data correction of fire coal is coal-fired.
Boiler controller system involved in the present invention, there is daily 4 classes of coal-fired industry analyze data, can be according to the numerical value to combustion The benchmark chemical composition of coal is corrected, and is corrected coal-fired benchmark chemical composition and is used following updating formula:
In formula, Xi,arFor calculating (carbon, hydrogen, oxygen, nitrogen, sulphur), % are analyzed with elemental composition;
Elemental composition for season chemical examination analyzes a reference value, (carbon, hydrogen, oxygen, nitrogen, sulphur), %;
WarFor Analysis Values, base moisture, %;
AarFor Analysis Values, base ash content, %;
For the moisture as received coal of season chemical examination, %;
For the As-received ash content of season chemical examination, %.
7th step:
On the basis of coal-fired chemical analysis value after the correction obtained by the 6th step, the temperature of both sides flue gas is obtained from measuring point The related datas such as degree, pressure, flow, Temperature of Working and pressure flow, both sides are tried to achieve with reference to formula (2) and formula (3) simultaneous The flue gas flow of flue:
According to the design parameter of boiler, the flue gas share of left and right sides flue is about 3 under declared working condition:7, using live real The left side flue gas share that border service data is calculated gained by the above method is as shown in Figure 2.
As seen from Figure 2, the result of calculation in the declared working condition stage is more coincide with design load.
It should be noted that the invention is not limited in any way for above-described embodiment, it is all to use equivalent substitution or equivalent change The technical scheme that the mode changed is obtained, all falls within protection scope of the present invention.

Claims (5)

  1. A kind of 1. coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method, it is characterised in that including following step Suddenly:
    The first step:The coal-fired composition and characteristic of benchmark are determined according to power station actual conditions;The fixed sampling time is chosen, is passed through OPC communications protocol obtains boiler operatiopn related data in real time;
    Second step:Based on flue gas physical characteristic, according to the coal-fired composition of the benchmark determined in the first step, 1kg fired coal combustions are calculated Every characteristic of product afterwards, and establish the benchmark flue gas Data Base of Chemical Compound of boiler;By water and steam thermodynamic properties IAPWS- The vectorization of IF97 formula is used for the real-time calculating of working medium enthalpy;
    3rd step:The boiler operatiopn related data got to the first step carries out bad point processing and data smoothing processing, so as to The real-time data base of the related operational factor of boiler tail flue after to processing;
    4th step:The fume side established before and after the boiler tail both sides economizer based on quality and energy balance and working medium side it is flat Weigh equation, is represented with equation below:
    <mrow> <mtable> <mtr> <mtd> <mrow> <msub> <mi>m</mi> <mi>l</mi> </msub> <msub> <mi>&amp;Delta;H</mi> <mi>l</mi> </msub> <mo>+</mo> <msub> <mi>m</mi> <mi>r</mi> </msub> <msub> <mi>&amp;Delta;H</mi> <mi>r</mi> </msub> <mo>=</mo> <msub> <mi>Q</mi> <mrow> <mi>s</mi> <mi>m</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>m</mi> <mi>l</mi> </msub> <mo>+</mo> <msub> <mi>m</mi> <mi>r</mi> </msub> <mo>=</mo> <msub> <mi>m</mi> <mrow> <mi>t</mi> <mi>o</mi> <mi>t</mi> <mi>a</mi> <mi>l</mi> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
    In formula, ml、mrAnd mtotalRespectively tail vertical well gas flue left side, right side and total flue gas mass flow, kg/s;
    ΔHlWith Δ HrThe enthalpy change of unit mass flue gas, kJ/kg respectively in the flue of the left and right sides;
    QsmThe heat absorbed for working medium in the economizer of boiler tail flue both sides, kJ/s;
    5th step:Above-mentioned equilibrium equation is corrected according to the accumulation of heat in working medium under temperature change and metal heated face change, it is revised Economizer energy and mass balance equation are represented with equation below:
    Q′sm=Qsm+ΔQq+ΔQj (3)
    In formula, Q 'smThe heat absorbed for working medium in the economizer of revised boiler tail flue both sides, kJ/s;
    ΔQqFor working medium accumulation of heat variable quantity, kJ/kg;
    ΔQjFor heating surface metal accumulation of heat variable quantity, kJ/kg;
    6th step:According to the benchmark chemical composition that the Industrial Analysis Data correction of fire coal is coal-fired;
    7th step:On the basis of coal-fired chemical analysis value after the correction obtained by the 6th step, both sides flue gas is obtained from measuring point Temperature, pressure, flow, the related data of Temperature of Working and pressure flow, tried to achieve with reference to formula (2) and formula (3) simultaneous The flue gas flow of two side flues:
    <mrow> <msub> <mi>m</mi> <mi>l</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msubsup> <mi>Q</mi> <mrow> <mi>s</mi> <mi>m</mi> </mrow> <mo>&amp;prime;</mo> </msubsup> <mo>-</mo> <msub> <mi>m</mi> <mrow> <mi>t</mi> <mi>o</mi> <mi>t</mi> <mi>a</mi> <mi>l</mi> <mi>r</mi> </mrow> </msub> <msub> <mi>&amp;Delta;H</mi> <mi>r</mi> </msub> </mrow> <mrow> <msub> <mi>&amp;Delta;H</mi> <mi>l</mi> </msub> <mo>-</mo> <msub> <mi>&amp;Delta;H</mi> <mi>r</mi> </msub> </mrow> </mfrac> </mrow>
    <mrow> <msub> <mi>m</mi> <mi>r</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msubsup> <mi>Q</mi> <mrow> <mi>s</mi> <mi>m</mi> </mrow> <mo>&amp;prime;</mo> </msubsup> <mo>-</mo> <msub> <mi>m</mi> <mrow> <mi>t</mi> <mi>o</mi> <mi>t</mi> <mi>a</mi> <mi>l</mi> </mrow> </msub> <msub> <mi>&amp;Delta;H</mi> <mi>l</mi> </msub> </mrow> <mrow> <msub> <mi>&amp;Delta;H</mi> <mi>r</mi> </msub> <mo>-</mo> <msub> <mi>&amp;Delta;H</mi> <mi>l</mi> </msub> </mrow> </mfrac> <mo>.</mo> </mrow>
  2. 2. coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method according to claim 1, its feature It is, in the first step, the sampling time is 5 seconds.
  3. 3. coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method according to claim 1, its feature It is, in the third step, the method being fitted is slided to judge bad point by multinomial, and it is rejected.
  4. 4. coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method according to claim 1, its feature It is, in the third step, data is smoothed by the method for data weighting filtering, are specifically:
    <mrow> <msub> <mover> <mi>y</mi> <mo>^</mo> </mover> <mi>m</mi> </msub> <mo>=</mo> <mn>0.02</mn> <msub> <mi>y</mi> <mrow> <mi>m</mi> <mo>-</mo> <mn>3</mn> </mrow> </msub> <mo>+</mo> <mn>0.05</mn> <msub> <mi>y</mi> <mrow> <mi>m</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <mo>+</mo> <mn>0.08</mn> <msub> <mi>y</mi> <mrow> <mi>m</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mo>+</mo> <mn>0.7</mn> <msub> <mi>y</mi> <mi>m</mi> </msub> <mo>+</mo> <mn>0.08</mn> <msub> <mi>y</mi> <mrow> <mi>m</mi> <mo>+</mo> <mn>1</mn> </mrow> </msub> <mo>+</mo> <mn>0.05</mn> <msub> <mi>y</mi> <mrow> <mi>m</mi> <mo>+</mo> <mn>2</mn> </mrow> </msub> <mo>+</mo> <mn>0.02</mn> <msub> <mi>y</mi> <mrow> <mi>m</mi> <mo>+</mo> <mn>3</mn> </mrow> </msub> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
    In formula,For filtered data;
    yiFor the actual measured value at i moment, i=m-3, m-2, m-1, m, m+1, m+2, m+3.
  5. 5. coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method according to claim 1, its feature It is, in the 6th step, corrects coal-fired benchmark chemical composition and use following updating formula:
    <mrow> <msub> <mi>X</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>a</mi> <mi>r</mi> </mrow> </msub> <mo>=</mo> <msubsup> <mi>X</mi> <mrow> <mi>i</mi> <mo>,</mo> <mi>a</mi> <mi>r</mi> </mrow> <mn>0</mn> </msubsup> <mfrac> <mrow> <mn>100</mn> <mo>-</mo> <msub> <mi>W</mi> <mrow> <mi>a</mi> <mi>r</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>A</mi> <mrow> <mi>a</mi> <mi>r</mi> </mrow> </msub> </mrow> <mrow> <mn>100</mn> <mo>-</mo> <msubsup> <mi>W</mi> <mrow> <mi>a</mi> <mi>r</mi> </mrow> <mn>0</mn> </msubsup> <mo>-</mo> <msubsup> <mi>A</mi> <mrow> <mi>a</mi> <mi>r</mi> </mrow> <mn>0</mn> </msubsup> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
    In formula, Xi,arFor calculating carbon, hydrogen, oxygen, nitrogen, element sulphur constituent analysis, %;
    For the carbon of season chemical examination, hydrogen, oxygen, nitrogen, element sulphur constituent analysis a reference value, %;
    WarFor Analysis Values, base moisture, %;
    AarFor Analysis Values, base ash content, %;
    For the moisture as received coal of season chemical examination, %;
    For the As-received ash content of season chemical examination, %.
CN201711050194.6A 2017-10-31 2017-10-31 A kind of coal-fired power station boiler afterbody twin flue flue gas flow online soft sensor method Pending CN107861911A (en)

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