CN106622620A - Medium-speed coal mill model building method based on system dynamics - Google Patents
Medium-speed coal mill model building method based on system dynamics Download PDFInfo
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- CN106622620A CN106622620A CN201610853981.3A CN201610853981A CN106622620A CN 106622620 A CN106622620 A CN 106622620A CN 201610853981 A CN201610853981 A CN 201610853981A CN 106622620 A CN106622620 A CN 106622620A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention provides a medium-speed coal mill model building method based on system dynamics. According to the method, two subsystems are arranged in a medium-speed coal mill model and include the coal mill power output subsystem and the coal mill pulverized coal outlet temperature subsystem, wherein the coal feed quantity of a coal feeder is input into the coal mill power output subsystem, and the coal mill power output subsystem outputs power to a coal mill; primary parameters, output power of the coal mill and the coal feed quantity of the coal feeder are input into the coal mill pulverized coal outlet temperature subsystem, and the coal mill pulverized coal outlet temperature subsystem outputs heat of wind-powder mixtures at an outlet of the coal mill. According to the method, the medium-speed coal mill is modeled from the balanced angle of matter and energy according to the system dynamics principle. By means of the method, a simple, practical, reasonable and reliable model can be provided for analysis and control over the medium-speed coal mill, so that guarantees are provided for safe, stable and economical operation of power station boilers.
Description
Technical field
The present invention relates to a kind of method that angle from matter and energy balance is modeled to medium-speed pulverizer, category
In technical field of power generation.
Background technology
Rapid development of economy promotes developing rapidly for electric power, and China's richness coal, oil-poor, few gas and water conservancy power station are by certainly
The energy resource structure situation that so condition is limited, determines that coal remains the main energy sources of China's dependence.With domestic electrical industry
Fast development, the range of application of medium-speed pulverizer constantly expands and has become the main powder manufacturing apparatus of thermal power plant, its operation
The stability and economy that situation is run on boiler of power plant has directly impact.Medium-speed pulverizer belongs to big to postpone and big inertia
Object, the reasonable control to its thermal process is to ensure the technical measures of equipment safety and economical operation, and is automatically controlled
The success or not of system design, has much relations with the reasonability of controlled device Mathematical Modeling.Existing medium-speed pulverizer modeling
The problems of method mainly has following two aspects：
First, ignore the analysis to medium-speed pulverizer system mechanism, the effect of service data is put undue emphasis on, by neutral net
Deng instrument, the complex mappings between input/output are obtained by way of approaching, being fitted, and then simulate the operation of unit.Using this
Model structure complexity, debugging difficulty that the method for kind builds, the physical significance of each variable is indefinite in model.
2nd, the accuracy of model is excessively valued, it is desirable to all take into account internal system, outside various influence factors
Go, mechanically expand the scale of model, it is believed that more complicated model accuracy is higher.This modeling method is not only it cannot be guaranteed that model
Quality, can also to a certain extent reduce the practicality and applicability of model.
The content of the invention
Present invention aims to the drawback of prior art, there is provided a kind of medium-speed pulverizer based on system dynamics
Model building method, to improve the structure quality of medium-speed pulverizer model, it is ensured that the stability and economy of boiler of power plant operation.
Problem of the present invention is with following technical proposals solution：
A kind of medium-speed pulverizer model building method based on system dynamics, methods described is in medium-speed pulverizer model
Two subsystems, respectively pulverizer capacity subsystem and coal pulverizer discharge temperature subsystem are set, wherein, coal pulverizer goes out
The input of power subsystem is feeder coal-supplying amount, is output as pulverizer capacity；The input of coal pulverizer discharge temperature subsystem
For First air parameter, pulverizer capacity and feeder coal-supplying amount, coal pulverizer exit wind powder mixture heat is output as.
The above-mentioned medium-speed pulverizer model building method based on system dynamics, respectively exports in the medium-speed pulverizer model
Variable is obtained as follows：
A. pulverizer capacity BoutFor：
Bout=k × fH×fR×fW×fA×Mm,
K is power factor in formula；Determined according to the design data of coal pulverizer；fHRepresent that erosive index affects on grinding power
Correction factor；fRRepresent that fineness of pulverized coal affects correction factor to grinding power；fWRepresent that raw coal moisture affects amendment system to grinding power
Number；fARepresent that coal ash affects correction factor to grinding power；MmRepresent coal pulverizer coal load quantity, the coal pulverizer coal load quantity M of tm
T () is calculated by following formula：
Mm(t)=Mm(t-1)+(Bin-Bout)×k1×DT,
In formula, Mm(t-1) t-1 moment coal pulverizer coal load quantities are represented；BinRepresent feeder coal-supplying amount；k1Turn for the first unit
Change the factor；DTFor simulation step length；
B. coal pulverizer exit wind powder mixture heat Qair,mfCalculated by following formula：
Qair,mf=Qmf+Qout,air
Q in formulamfRepresent coal pulverizer exit coal dust heat, Qout,airCoal pulverizer outlet wind-heat amount is represented, is entered according to following formula
Row is calculated：
Qmf=k3×Bout×cmf×TOUT
Qout,air=Wair,out×cair,out×TOUT
C. pulverizer outlet temperature TOUTCalculated by following formula：
TOUT=Q/ (cmf×Mmf+cair,in×Mair)
Q represents total amount of heat in coal pulverizer in formula；cmfRepresent the specific heat capacity of coal dust；MmfRepresent the quality of coal dust in coal pulverizer；
cair,inFor First air specific heat capacity；MairFor primary air flow in coal pulverizer, calculated according to following formula：
Q=Q (t-1)+(QIN-QOUT)×DT
QOUT=Qair,mf+Qevp+Qf+Qle,
QIN=QM+Qair+Qmac
QM=k2×Bin×ccoal×Tcoal
Qair=Wair,in×cair,in×Tair,in
Q in formulaevpThe heat that coal dust moisture evaporation is consumed is represented, according to actual conditions, indirect assignment；QfRepresent heating combustion
The heat that material is consumed, according to actual conditions, indirect assignment；QleThe heat that sealing air is taken away is represented, according to actual conditions, is directly assigned
Value；QOUTExpression is taken out of and dispersed heat.Q represents total amount of heat in coal pulverizer；Q (t-1) represents total heat in upper moment coal pulverizer
Amount；QINRepresent the heat of coal pulverizer input；QINRepresent the heat of coal pulverizer input；QMRepresent the heat that raw coal is brought into；QairRepresent
The heat that First air is brought into；QmacIt is the heat produced when coal pulverizer works；k2It is the second unit conversion factor；ccoalRepresent raw coal
Specific heat capacity；TcoalRepresent raw coal temperature；Wair,inRepresent a wind flow；cair,inRepresent First air specific heat capacity；Tair,inRepresent one
Secondary wind inlet temperature.
Application system principle of dynamics of the present invention, builds from the angle of matter and energy balance to medium-speed pulverizer
Mould.The method can provide simple and practical, reasonable reliably model for the analysis of medium-speed pulverizer and control, so as to for power plant's pot
The safe and stable of stove, economical operation are provided and ensured.
Description of the drawings
Fig. 1 is the structural representation based on the medium-speed pulverizer model of system dynamics；
Fig. 2 is the modeling procedure figure of the present invention；
Fig. 3 is medium-speed pulverizer system casual loop diagram；
Fig. 4 is medium-speed pulverizer system storage flow diagram；
Fig. 5, Fig. 6 and Fig. 7 are the simulation design sketch of model of the present invention.
Each symbol is expressed as in text：MmT () represents coal pulverizer coal load quantity, t；Mm(t-1) represent that upper moment coal pulverizer deposits coal
Amount, t；BinRepresent feeder coal-supplying amount, t/h；BoutRepresent pulverizer capacity, t/h；k1For the first unit conversion factor, h/s；DT
For simulation step length, s；Q represents total amount of heat in coal pulverizer, kJ；Q (t-1) represents total amount of heat in upper moment coal pulverizer, kJ, QOUTTable
Show and take out of and dispersed heat, QINRepresent the heat of coal pulverizer input；BoutRepresent pulverizer capacity, t/h；K is power factor,
Determined according to the design data of coal pulverizer；fHRepresent that erosive index affects correction factor to grinding power；fRRepresent fineness of pulverized coal pair
Grinding power affects correction factor；fWRepresent that raw coal moisture affects correction factor to grinding power；fARepresent coal ash to grinding power shadow
Ring correction factor；QINRepresent the heat of coal pulverizer input, kJ/s；QMRepresent the heat that raw coal is brought into, kJ/s；QairRepresent once
The heat that wind is brought into, kJ/s；QmacThe heat produced when being coal pulverizer work, kJ/s；QOUTExpression is taken out of and dispersed heat,
Qair,mfRepresent coal pulverizer exit wind powder mixture heat, QevpRepresent the heat that coal dust moisture evaporation is consumed, QfRepresent fuel
The heat of consumption, QleThe heat that sealing air is taken away is represented, the unit of above-mentioned variable is：kJ/s；QMRepresent the heat that raw coal is brought into
Amount, kJ/s；k2It is the second unit conversion factor, k2=1000,1000kg/t；ccoalRepresent raw coal specific heat capacity, kJ/ (kg DEG C)；
TcoalRaw coal temperature is represented, DEG C；QairRepresent the heat that First air is brought into, kJ/s；Wair,inRepresent a wind flow, kg/s；
cair,inRepresent First air specific heat capacity, kJ/ (kg DEG C)；Tair,inFirst air inlet temperature is represented, DEG C；QmfRepresent coal pulverizer outlet
Place's coal dust heat, k3For the 3rd unit conversion factor,t·h/(kg·s)；cmfFor coal dust specific heat capacity, kJ/
(kg·℃)；TOUTFor pulverizer outlet temperature, DEG C；Qout,airRepresent coal pulverizer outlet wind-heat amount, kJ/s；Wair,outRepresent coal-grinding
Machine exports wind flow, kg/s；cair,outRepresent one's intention as revealed in what one says specific heat capacity, kJ/ (kg DEG C)；Qair,mfRepresent coal pulverizer exit wind
Powder mixture heat, kJ/s；TOUTPulverizer outlet temperature is represented, DEG C；MmfThe quality of coal dust in coal pulverizer is represented, unit is kg；
MairPrimary air flow in coal pulverizer is represented, unit is kg.
Specific embodiment
Below in conjunction with the accompanying drawings the invention will be further described.
Fig. 1 is refer to, the present invention includes pulverizer capacity subsystem and coal pulverizer discharge temperature subsystem.Coal pulverizer
Subsystem exert oneself for studying the impact of coal-supplying amount and ature of coal to pulverizer capacity.Coal pulverizer discharge temperature subsystem is used
To study coal-supplying amount, the impact of ature of coal and First air to coal pulverizer discharge temperature.
Fig. 2 is refer to, the workflow of the present invention is as follows：
1. the primary variables of model is determined
Variable in model has storage variable, flow variable and auxiliary variable.For simplified model parameter, to those at any time
Between change very not significant parameter and be also approx taken as constant.
Storage variable is：Storage heat in coal pulverizer coal load quantity, coal pulverizer.
Flow variable is：Feeder coal-supplying amount, pulverizer capacity, heat, the heat taking out of and consume of coal pulverizer input.
Auxiliary variable is：Raw coal moisture on grind power affect correction factor, fineness of pulverized coal on grind power affect correction factor,
Raw coal moisture affects correction factor, coal ash to grinding heat, raw coal that power affects correction factor, raw coal to bring into grinding power
Heat, wind flow, First air specific heat capacity, First air inlet temperature, a coal-grinding that specific heat capacity, raw coal temperature, First air are brought into
Heat, coal pulverizer exit coal dust heat, pulverizer outlet temperature, coal pulverizer outlet wind-heat amount, coal-grinding that machine is produced when working
Machine exports wind flow, goes out one's intention as revealed in what one says specific heat capacity, coal pulverizer exit wind powder mixture heat, takes out of and dispersed heat, coal dust water
Coal dust in heat, pulverizer outlet temperature, coal pulverizer that heat that point evaporation is consumed, the heat of fuel consumption, sealing air are taken away
Quality, coal pulverizer in primary air flow, raw coal specific heat capacity, coal dust specific heat capacity, the coal pulverizer heat, the coal dust moisture that produce when working
Heat, the first unit conversion factor that evaporation is consumed, the second unit conversion factor.
In the case of being adjusted according to input variable, the variable observed trend over time analyzes input variable pair
The impact of pulverizer capacity and coal pulverizer discharge temperature.
2. the functional expression of model primary variables is determined
System dynamics solve problem, on the basis of qualitative analysis, will finally set up the storage flow diagram of quantitative analysis
Simulation model, the qualitative analysis of conceptual model and logical model above has laid base to set up system dynamics quantitative model
Plinth.
Storage variable function formula：
Mm(t)=Mm(t-1)+(Bin-Bout)×k1×DT,
M in above formulamT () represents coal pulverizer coal load quantity, t；Mm(t-1) upper moment coal pulverizer coal load quantity, t are represented；BinTable
Show feeder coal-supplying amount, t/h；BoutRepresent pulverizer capacity, t/h；k1For the first unit conversion factor, h/s；DTFor emulation step
It is long, s.
Q=Q (t-1)+(QIN-QOUT)×DT,
Q represents total amount of heat in coal pulverizer, kJ in above formula；Q (t-1) represents total amount of heat in upper moment coal pulverizer, kJ, QOUT
Expression is taken out of and dispersed heat, QINRepresent the heat of coal pulverizer input.
Flow variable functional expression：
Bout=k × fH×fR×fW×fA×Mm,
B in above formulaoutRepresent pulverizer capacity, t/h；K is power factor, is determined according to the design data of coal pulverizer；fHTable
Show that erosive index affects correction factor to grinding power；fRRepresent that fineness of pulverized coal affects correction factor to grinding power；fWRepresent raw coal
Moisture affects correction factor to grinding power；fARepresent that coal ash affects correction factor to grinding power.
QIN=QM+Qair+Qmac,
Q in above formulaINRepresent the heat of coal pulverizer input, kJ/s；QMRepresent the heat that raw coal is brought into, kJ/s；QairRepresent one
The heat that secondary wind is brought into, kJ/s；QmacThe heat produced when being coal pulverizer work, kJ/s.
QOUT=Qair,mf+Qevp+Qf+Qle,
Q in above formulaOUTExpression is taken out of and dispersed heat, Qair,mfRepresent coal pulverizer exit wind powder mixture heat, Qevp
Represent the heat that coal dust moisture evaporation is consumed, QfRepresent the heat of fuel consumption, QleRepresent the heat that sealing air is taken away, above-mentioned change
The unit of amount is：kJ/s.
3. determine the functional expression of auxiliary variable, obtain the system dynamics model of medium-speed pulverizer system.
Primary function formula：
Erosive index (HGI) on grind power affect correction factor computing formula be：
Fineness of pulverized coal (R90) be on the computing formula for grinding power impact correction factor：
Raw coal moisture (Mt) be on the computing formula for grinding power impact correction factor：
fW=1.0+ (10-Mt)×0.0114
Coal ash (Aar) be on the computing formula for grinding power impact correction factor：
fA=1.0+ (20-Aar) × 0.005,
Work as AarWhen≤20%, fA=1.
QM=k2×Bin×ccoal×Tcoal,
Q in above formulaMRepresent the heat that raw coal is brought into, kJ/s；k2It is the second unit conversion factor, k2=1000,1000kg/
t；ccoalRepresent raw coal specific heat capacity, kJ/ (kg DEG C)；TcoalRaw coal temperature is represented, DEG C.
Qair=Wair,in×cair,in×Tair,in
Q in above formulaairRepresent the heat that First air is brought into, kJ/s；Wair,inRepresent a wind flow, kg/s；cair,inRepresent
First air specific heat capacity, kJ/ (kg DEG C)；Tair,inFirst air inlet temperature is represented, DEG C.
The output pulverizer capacity B of pulverizer capacity subsystemoutIt is the input of coal pulverizer discharge temperature subsystem,
The flow variable connects two subsystems, according to coal pulverizer out BoutCoal pulverizer exit coal dust heat can be obtained：
Qmf=k3×Bout×cmf×TOUT
Q in above formulamfRepresent coal pulverizer exit coal dust heat, k3For the 3rd unit conversion factor,
t·h/(kg·s)；cmfFor coal dust specific heat capacity, kJ/ (kg DEG C)；TOUTFor pulverizer outlet temperature, DEG C.
Qout,air=Wair,out×cair,out×TOUT
Q in above formulaout,airRepresent coal pulverizer outlet wind-heat amount, kJ/s；Wair,outRepresent coal pulverizer outlet wind flow, kg/s；
cair,outRepresent one's intention as revealed in what one says specific heat capacity, kJ/ (kg DEG C).
Qair,mf=Qmf+Qout,air
Q in above formulaair,mfRepresent coal pulverizer exit wind powder mixture heat, kJ/s.
TOUT=Q/ (cmf×Mmf+cair,in×Mair)
Above formula be pulverizer outlet temperature computing formula, TOUTPulverizer outlet temperature is represented, DEG C；MmfIn representing coal pulverizer
The quality of coal dust, kg；MairRepresent primary air flow in coal pulverizer, kg.
4. the system dynamics model of pair medium-speed pulverizer is debugged.
With Vensim PLE running software model systems, variable and defined variable are set in Vensim PLE emulation platforms
Equation, to system model artificial debugging is carried out.
Fig. 3 and Fig. 4 are respectively medium-speed pulverizer system casual loop diagram and medium-speed pulverizer system storage flow diagram, the figure
The causality between each variable in medium-speed pulverizer system is described and analyzed, is conducive to the Study system of our profound levels.
Storage flow diagram quantitatively describes the direct relation of each variable of system, and the storage flow diagram is the model of medium-speed pulverizer.
Fig. 5, Fig. 6 and Fig. 7 are the simulation design sketch of model of the present invention.The Kazakhstan of the coal that the coal pulverizer grinds when working can
Mill property coefficient (HGI) is 74, ash content (Aar) it is 12.02%, moisture (Mt) it is 15.9%, disintegrating outlet coal dust is assumed in experimentation
Fineness (R90) maintain 23%.According to computing formula above, can obtain：fH=1.25, fR=1.04, fW=0.933, fA=1.It is false
Fixed mill is not affected by abrasion, is grinding into one's intention as revealed in what one says pressure and outlet pressure (furnace pressure) remains unchanged.Below all of test is all from same
What one operating point started, under the initial operating mode, disintegrating outlet temperature is approximately 86 DEG C, and entrance wind-warm syndrome is 298 DEG C, grinds power and to coal
Amount is all 34.92t/h, and a wind flow is 16.78kg/s.Under the steady working condition of coal pulverizer, other conditions of system are constant
In the case of, coal-supplying amount from initial 34.92t/h increase to 39.52t/h when, the change of pulverizer capacity and pulverizer outlet temperature
Change trend is as shown in Figure 5, Figure 6.In the case that other conditions of system are constant, entrance wind-warm syndrome is increased to 305 DEG C from initial 298 DEG C
When, the variation tendency of disintegrating outlet temperature is as shown in Figure 7.
Described above is only the preferred embodiments of the present invention, is not limited to the present invention.All core in the present invention
Within heart technology, any equivalent modifications, replacement, improvement for being done etc. should be included within the scope of the present invention.
Claims (2)
1. a kind of medium-speed pulverizer model building method based on system dynamics, is characterized in that, methods described is in middling speed coal-grinding
Two subsystems, respectively pulverizer capacity subsystem and coal pulverizer discharge temperature subsystem are set in machine model, wherein,
The input of pulverizer capacity subsystem is feeder coal-supplying amount, is output as pulverizer capacity；Coal pulverizer discharge temperature subsystem
The input of system is First air parameter, pulverizer capacity and feeder coal-supplying amount, is output as coal pulverizer exit wind powder mixture heat
Amount.
2. the medium-speed pulverizer model building method based on system dynamics according to claim 1, is characterized in that, described
Each output variable is obtained as follows in medium-speed pulverizer model：
A. pulverizer capacity BoutFor：
Bout=k × fH×fR×fW×fA×Mm
K is power factor in formula；Determined according to the design data of coal pulverizer；fHRepresent that erosive index affects amendment to grinding power
Coefficient；fRRepresent that fineness of pulverized coal affects correction factor to grinding power；fWRepresent that raw coal moisture affects correction factor to grinding power；fA
Represent that coal ash affects correction factor to grinding power；MmRepresent coal pulverizer coal load quantity, the coal pulverizer coal load quantity M of tm(t) by
Following formula is calculated：
Mm(t)=Mm(t-1)+(Bin-Bout)×k1×DT,
M in formulam(t-1) t-1 moment coal pulverizer coal load quantities are represented；BinRepresent feeder coal-supplying amount；k1For the first Conversion of measurement unit because
Son；DTFor simulation step length；
B. coal pulverizer exit wind powder mixture heat Qair,mfCalculated by following formula：
QOUT=Qair,mf+Qevp+Qf+Qle,
Q in formulaevpRepresent the heat that coal dust moisture evaporation is consumed；QfRepresent the heat of fuel consumption；QleRepresent what sealing air was taken away
Heat；QOUTExpression is taken out of and dispersed heat, is calculated according to following formula：
Q=Q (t-1)+(QIN-QOUT)×DT
QIN=QM+Qair+Qmac,
QM=k2×Bin×ccoal×Tcoal
Qair=Wair,in×cair,in×Tair,in,
In formula, Q represents total amount of heat in coal pulverizer；Q (t-1) represents total amount of heat in upper moment coal pulverizer；QINRepresent that coal pulverizer is defeated
The heat for entering；QINRepresent the heat of coal pulverizer input；QMRepresent the heat that raw coal is brought into；QairRepresent the heat that First air is brought into；
QmacIt is the heat produced when coal pulverizer works；k2It is the second unit conversion factor；ccoalRepresent raw coal specific heat capacity；TcoalRepresent former
Coal temperature；Wair,inRepresent a wind flow；cair,inRepresent First air specific heat capacity；Tair,inRepresent First air inlet temperature.
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| CN108636586A (en) * | 2018-04-12 | 2018-10-12 | 中国神华能源股份有限公司 | Determine the method and device of pulverizer capacity correction factor |
| CN109107744A (en) * | 2018-06-15 | 2019-01-01 | 东南大学 | A kind of medium-speed pulverizer coal-air ratio and oil pressure dynamic become excellent method of adjustment |
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| CN110124842A (en) * | 2019-05-15 | 2019-08-16 | 广东电网有限责任公司 | A kind of boiler controller system and its pulverizer outlet temperature control method and system |
| CN111617876A (en) * | 2020-04-10 | 2020-09-04 | 杭州电子科技大学 | Method for optimizing online comprehensive operation of coal mill |
| CN113457791A (en) * | 2021-07-15 | 2021-10-01 | 西安热工研究院有限公司 | Online automatic optimization method for operating parameters of medium-speed coal mill for high-moisture coal |
| CN114602607A (en) * | 2022-03-16 | 2022-06-10 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Positive pressure direct blowing type coal mill inlet air volume correction method |
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| CN109107744B (en) * | 2018-06-15 | 2020-09-01 | 东南大学 | Medium-speed mill air-coal ratio and oil pressure dynamic optimization-approaching adjusting method |
| CN109459102A (en) * | 2018-11-27 | 2019-03-12 | 江苏方天电力技术有限公司 | A kind of medium-speed pulverizer import primary air measuring method and system |
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| CN113457791B (en) * | 2021-07-15 | 2022-05-13 | 西安热工研究院有限公司 | Online automatic optimization method for operating parameters of medium-speed coal mill for high-moisture coal |
| CN114602607A (en) * | 2022-03-16 | 2022-06-10 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Positive pressure direct blowing type coal mill inlet air volume correction method |
| CN114602607B (en) * | 2022-03-16 | 2023-09-22 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Positive pressure direct blowing coal mill inlet air quantity correction method |
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