CN107577844A - The Forecasting Methodology and system of a kind of slot type photo-thermal power station mirror field outlet temperature - Google Patents

The Forecasting Methodology and system of a kind of slot type photo-thermal power station mirror field outlet temperature Download PDF

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CN107577844A
CN107577844A CN201710659592.1A CN201710659592A CN107577844A CN 107577844 A CN107577844 A CN 107577844A CN 201710659592 A CN201710659592 A CN 201710659592A CN 107577844 A CN107577844 A CN 107577844A
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mrow
msub
slot type
mfrac
power station
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CN107577844B (en
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朱凌志
陈宁
王湘艳
姚志豪
张亚南
王宇扬
施涛
曲立楠
于若英
赵大伟
赵亮
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Suncan Energy-Saving Photothermal Technology Co Ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanxi Electric Power Co Ltd
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Suncan Energy-Saving Photothermal Technology Co Ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanxi Electric Power Co Ltd
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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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

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Abstract

The present invention proposes the Forecasting Methodology and system of a kind of slot type photo-thermal power station mirror field outlet temperature, and methods described includes：Obtain the actual operation parameters in preset time period slot type photo-thermal power station；The actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature prediction model pre-established, to determine heat collector optical efficiency actual value；According to the beam radia prediction of strength value of temperature prediction model, heat collector optical efficiency actual value and period to be predicted, slot type photo-thermal power station mirror field exit temperature prediction value is determined.Forecasting Methodology and system provided by the invention can be in Accurate Prediction a period of time in future mirror field outlet temperature；For the concentrator tracking angle of adjustment control in time, prevent that conduction oil overtemperature in thermal-collecting tube, cracking are significant.

Description

The Forecasting Methodology and system of a kind of slot type photo-thermal power station mirror field outlet temperature
Technical field
The present invention relates to power station automation control technology field, and in particular to a kind of slot type photo-thermal power station mirror field outlet temperature Forecasting Methodology and system.
Background technology
Slot type Jing Chang is the collection of energy part in groove type solar photo-thermal power station, and slot type Jing Chang mainly includes some parallel connections Slot type loop, be mainly made up of some heat collectors per long tank type loop, heat collector mainly include collector bracket, thermal-collecting tube, The core components such as speculum, tracking control system.Slot type photo-thermal power generation focuses on beam radia using paraboloidal concentrator The heat-transfer fluid in thermal-collecting tube is heated, conventional heat-transfer fluid is conduction oil, and highest can be warming up to 400 DEG C, by heat-conducting oil heating To the condition of high temperature, Steam Turbine is driven to generate electricity for producing steam.Temperature of the conduction oil in slot type photo-thermal power station Jing Chang exits Also referred to as slot type photo-thermal power station mirror field outlet temperature.
Slot type photo-thermal power station mirror field outlet temperature is determined by many factors, includes intensity of solar radiation, site environment temperature Degree, wind speed and heat transfer oil flow etc..In the power generation process of slot type photo-thermal power station, because above-mentioned factor can change at any time, such as Fruit is controlled to the heat transfer oil flow of thermal-arrest Bottomhole pressure not in time, and mirror field outlet temperature is too high to cause heat conduction oil-breaking, The relevant device in photo-thermal power station is caused damage, is also possible to that production accident can be caused when serious.Therefore, accurately predict slot type Photo-thermal power station mirror field outlet temperature, adjusts heat transfer oil flow in time, is played in the optimal control in slot type photo-thermal power station very heavy The effect wanted.Also the problem of those skilled in the art are in the urgent need to address is turned into.
The content of the invention
In order to solve in the prior art can not Accurate Prediction go out slot type photo-thermal power station mirror field outlet temperature the defects of, the present invention Purpose be the method for proposing a kind of slot type photo-thermal power station mirror field exit temperature prediction, this method is by following technical solution Realize：
Obtain the actual operation parameters in preset time period slot type photo-thermal power station；
The actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature prediction model pre-established, To determine heat collector optical efficiency actual value；
It is strong according to the beam radia of temperature prediction model, heat collector optical efficiency actual value and period to be predicted Predicted value is spent, determines slot type photo-thermal power station mirror field exit temperature prediction value.
Further, the actual operation parameters in the preset time period slot type photo-thermal power station are substituted into temperature prediction model, To determine heat collector optical efficiency actual value, including：
The actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature prediction model such as following formula：
In formula, actual operation parameters include：The slot type circuit entrance temperature T of default initial timein, preset termination moment Slot type circuit outlet actual temperature Tout, heat-transfer fluid mean temperature TmAnd default starting, the relevant parameter of end time are put down Average；The default starting, the relevant parameter average value of end time include heat-transfer fluid mass flow average valueHeat transfer stream Body specific heat capacity average value cf, slot type loop thermal-arrest area average Aa, heat collector heat dissipation capacity average value Qloss, connection heat collector Pipe heat dissipation average value Qloss,pipeWith the hot melt average value C in slot type looploop；
η is heat collector optical efficiency actual value；Kθb(θ) is the incident angle function of beam radia；GeFor direct sunlight Radiation intensity；Tm=(Tout+Tin)/2；
Heat collector optical efficiency actual value η is calculated according to the temperature prediction model.
Further, according to the sun of temperature prediction model, heat collector optical efficiency actual value and period to be predicted Direct solar radiation prediction of strength value, determine that slot type photo-thermal power station mirror field exit temperature prediction value includes：
Heat collector optical efficiency actual value is substituted into temperature prediction model；
Slot type photo-thermal power station mirror field exit temperature prediction value T is calculated by temperature prediction modelout,cal, such as following formula：
In formula, Ge,calFor the beam radia prediction of strength value of period to be predicted；Tin,realFor the groove at current time Formula circuit entrance temperature.
Another object of the present invention is to propose a kind of forecasting system of slot type photo-thermal power station mirror field outlet temperature, including：
Acquisition module, obtain the actual operation parameters in preset time period slot type photo-thermal power station；
Computing module, the actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature pre-established Forecast model, to determine heat collector optical efficiency actual value；
Prediction module, according to the sun of temperature prediction model, heat collector optical efficiency actual value and period to be predicted Direct solar radiation prediction of strength value, determine slot type photo-thermal power station mirror field exit temperature prediction value；
Modeling module, for pre-establishing and storage temperature forecast model.
Compared with immediate prior art, technical scheme provided by the invention has the advantages that：
The Forecasting Methodology and system of a kind of slot type photo-thermal power station mirror field outlet temperature provided by the invention, it is first pre- according to temperature The heat collector optical efficiency actual value that model determines preset time period is surveyed, is then imitated according to temperature prediction model and heat collector optics Rate actual value determines slot type photo-thermal power station mirror field exit temperature prediction value, and temperature prediction model therein according to obtaining too in advance Positive direct solar radiation intensity and the actual operation parameters in slot type photo-thermal power station structure.Forecasting Methodology and system and the existing skill of the present invention The optical efficiency of estimation is tried to achieve in art with minimum variance, then according to the method phase of the follow-up circuit outlet temperature of the numerical prediction Compare, more can accurately predict slot type photo-thermal power station mirror field outlet temperature, realize following one section to slot type photo-thermal power station The Accurate Prediction of mirror field outlet temperature in time, it is ensured that the safe and reliable operation in slot type photo-thermal power station.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of slot type photo-thermal power station mirror field exit temperature prediction method in the embodiment of the present invention.
Fig. 2 is the source figure of advance gathered data in the embodiment of the present invention；
Fig. 3 is the beam radia DNI distribution maps in the embodiment of the present invention；
Fig. 4 is the comparison diagram of the exit temperature prediction value that method is drawn in the embodiment of the present invention and measured value.
Embodiment
For a better understanding of the present invention, present disclosure is done further with reference to Figure of description and example Explanation.
Slot type photo-thermal power station mirror field exit temperature prediction method in the embodiment of the present invention can be predicted accurately Slot type photo-thermal power station mirror field outlet temperature interior in short-term, can be with caution system certainly when finding that outlet temperature exceedes predetermined threshold value Dynamic or on-site personnel manually adjusts heat-transfer fluid mass flow, to prevent conduction oil overtemperature in thermal-collecting tube, cracking to slot type The safe operation in photo-thermal power station impacts.
Involved slot type photo-thermal power station is composed in parallel by substantial amounts of slot type loop in the present invention, the heat transfer in each loop Fluid flow is basically identical, and the outlet temperature in each slot type loop is also consistent during normal operation, and therefore, each slot type loop goes out Mouth temperature is slot type photo-thermal power station mirror field outlet temperature.The method of the present invention is needed when realizing with as shown in Figure 2 too Based on the data that positive radiation monitoring station, weather station, slot type mirror field operational monitoring station are collected, to predict slot type photo-thermal electricity The mirror field outlet temperature stood.
Particular flow sheet such as Fig. 1 institutes of slot type photo-thermal power station mirror field exit temperature prediction method in the embodiment of the present invention Show, it comprises the following steps：
Step S101, obtain the actual operation parameters in preset time period slot type photo-thermal power station；
Step S102, the actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature pre-established Forecast model, to determine heat collector optical efficiency actual value；
Step S103, according to the sun of temperature prediction model, heat collector optical efficiency actual value and period to be predicted Direct solar radiation prediction of strength value, determine slot type photo-thermal power station mirror field exit temperature prediction value.
In above-mentioned steps S101, obtaining the actual operation parameters in preset time period slot type photo-thermal power station includes：
The slot type circuit entrance temperature T of default initial timeinThe slot type circuit outlet at (unit DEG C), preset termination moment is real Border temperature ToutThe mean temperature T of (unit DEG C), heat-transfer fluidm(unit DEG C) and default starting, the relevant parameter of end time Average value；The default starting, the relevant parameter average value of end time include heat-transfer fluid mass flow average value(unit Kg/s), heat-transfer fluid specific heat capacity average value cf(unit J/ (kg DEG C)), slot type loop thermal-arrest area average Aa(unit m2)、 Heat collector heat dissipation capacity average value Qloss, connection heat collector pipe heat dissipation average value Qloss,pipePut down with the hot melt in slot type loop Average Cloop(J/ DEG C of unit).
In above-mentioned steps S102, the actual operation parameters in the preset time period slot type photo-thermal power station are substituted into and pre-established Temperature prediction model, to determine heat collector optical efficiency actual value, may include steps of：
The actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature prediction model such as following formula：
For the slot-type optical collector of every day operation, its optical property changes with the time, but relatively stable in a short time, Actual operating data based on the short time, above-mentioned formula (1) is deformed into equation below (2), heat collector is calculated by formula (2) Optical efficiency actual value：
In formula, Tm=(Tout+Tin)/2；
η is heat collector optical efficiency actual value, and for slot type photo-thermal power station, the efficiency covers condenser mirrors minute surface The parameters such as reflectivity, cleannes, thermal-collecting tube transmitance, absorptivity, surface cleanness；
Kθb(θ) is the incident angle function of beam radia, for slot type photo-thermal power station, then for normal direction direct solar radiation Incident angle function related DNI；
GeFor beam radia intensity DNI, DNI distribution maps are illustrated in figure 3.
Actual operating data based on the short time, heat collector optical efficiency actual value η is calculated according to formula (1), then may be used To predict the mirror field outlet temperature in follow-up a period of time according to said temperature forecast model.It is signified short in the embodiment of the present invention Time refers generally to the slot type photo-thermal power station mirror field outlet temperature within predicting 5 minutes, it is necessary to the reality in the slot type photo-thermal power station of collection The preset time of border operational factor can take the actual parameter within 30 minutes to be advisable.
K in above-mentioned formula (1) and (2)θb(θ) can be calculated as follows：
In formula, θ is default starting, the beam radia DNI of end time incidence angle average value, unit °；IAM is Incident angle modifier；F is heat collector focal length, unit m；L be heat collector length, unit m.
IAM in above-mentioned formula (3) can be calculated as follows：
Q in above-mentioned formula (1) and (2)lossIt may be calculated as：
In formula, θ is default starting, the beam radia DNI of end time incidence angle average value；IAM is incidence angle Correction factor, the same formula of computational methods (3)；VwFor default starting, the ambient wind velocity average value of end time, unit m/s；TaFor Default starting, the environment temperature average value of end time, unit DEG C；A0~A6For the design factor of thermal-collecting tube heat dissipation capacity, the coefficient Any group of data in table 1 below can be selected, two groups of data are by the parameter of two kinds of experimental methods fittings, the substantially detailed phase of numerical value Closely.
The thermal-collecting tube heat dissipation capacity design factor of table 1
Q in above-mentioned formula (1) and (2)loss,pipeIt can be calculated as follows：
In formula, DoTo connect the external diameter after the duct wraps insulation material of heat collector, unit m；DiTo connect the pipe of heat collector Road internal diameter, unit m；λ be insulation material thermal conductivity, unit W/ (m DEG C)；α is the pipe surface heat transfer system of connection heat collector Number, unit W/ (m2DEG C),Wherein ω is to preset starting, the ambient wind velocity average value of end time, The general values of α are 11.63W/ (m2·℃)；Ta1For default starting, the pipeline external surface temperature of the connection heat collector of end time Average value, unit DEG C；Ta2For default starting, the environment temperature average value of end time, unit DEG C.
In above-mentioned steps S102, slot type photo-thermal power station is determined according to temperature prediction model and heat collector optical efficiency actual value Mirror field exit temperature prediction value, may include steps of：
Heat collector optical efficiency actual value is substituted into temperature prediction model；
Slot type photo-thermal power station mirror field exit temperature prediction value T is calculated by temperature prediction modelout,cal, such as following formula：
In formula, Ge,calFor the beam radia prediction of strength value of period to be predicted；Tin,realFor the groove at current time Formula circuit entrance temperature, remaining parameter are identical with parameter in formula (1).
Ge,calIt can use well known to a person skilled in the art prior art to be in the prior art predicted, such as：To going through The result that the history same period and the suitable data of weather conditions are fitted is as predicted value, or according to Application No. Direct sunlight spoke of the CN201710103508.8 solar energy direct solar radiation strength information Forecasting Methodology and system to future time Intensity is penetrated to be predicted.
In order to verify a kind of standard of the Forecasting Methodology of slot type photo-thermal power station mirror field outlet temperature provided in an embodiment of the present invention True property, when 10, the experimental data of 15 minutes before calculating, try to achieve slot type loop optical efficiency actual value, as shown in figure 4, The loop heat transfer oil outlet temperature of prediction and the outlet temperature trend surveyed are unanimous on the whole.30 divide when maximum deviation appears in 10, Reach 4.86 DEG C, undergo 3 minutes or so, hereafter prediction deviation gradually reduces, and average deviation is at 1.07 DEG C during test.It can be seen that Slot type photo-thermal power station mirror field provided in an embodiment of the present invention exit temperature prediction method can relatively accurately predict that appearance field goes out Mouth temperature.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of the pre- of slot type photo-thermal power station mirror field outlet temperature Examining system, the principle that these equipment solve problem is similar to the Forecasting Methodology of slot type photo-thermal power station mirror field outlet temperature, the one kind The forecasting system of slot type photo-thermal power station mirror field outlet temperature mainly includes acquisition module, structure module, computing module and prediction mould Block, the function of aforementioned four module is further described below：
Acquisition module, obtain the actual operation parameters in preset time period slot type photo-thermal power station；
Computing module, the actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature pre-established Forecast model, to determine heat collector optical efficiency actual value；
Prediction module, according to the sun of temperature prediction model, heat collector optical efficiency actual value and period to be predicted Direct solar radiation prediction of strength value, determine slot type photo-thermal power station mirror field exit temperature prediction value；
Modeling module, for pre-establishing and storage temperature forecast model.
Acquisition module obtains the actual operation parameters in preset time period slot type photo-thermal power station, can include：
The slot type circuit entrance temperature T of default initial timein, the preset termination moment slot type circuit outlet actual temperature Tout, heat-transfer fluid mean temperature TmAnd default starting, the relevant parameter average value of end time；The default starting, end Only the relevant parameter average value at moment includes heat-transfer fluid mass flow average valueHeat-transfer fluid specific heat capacity average value cf, groove Formula loop thermal-arrest area average Aa, heat collector heat dissipation capacity average value Qloss, connection heat collector pipe heat dissipation average value Qloss,pipeWith the hot melt average value C in slot type looploop。
Modeling module, it can be used for building the temperature prediction model such as following formula：
In formula, η is heat collector optical efficiency actual value；Kθb(θ) is the incident angle function of beam radia；GeFor the sun Direct solar radiation intensity；Tm=(Tout+Tin)/2。
Computing module, it can be used for the actual operation parameters in the preset time period slot type photo-thermal power station substituting into such as above formula Temperature prediction model in, and calculate heat collector optical efficiency actual value.
Q in temperature prediction modellossIt can be calculated as follows by computing module：
In formula, θ is the incidence angle average value of the beam radia of default starting and end time；IAM repaiies for incidence angle Positive coefficient；VwFor default starting and the ambient wind velocity average value of end time；A0~A6For the design factor of thermal-collecting tube heat dissipation capacity； TaFor default starting and the environment temperature average value of end time.
The A0~A6A can be selected0=0.357, A1=0.0524, A2=-2.96 × 10-4、A3=1.126 × 10-6、A4 =1.068 × 10-8、A5=-0.0224, A6=0.002012, A can also be selected0=0.801, A1=0.0494, A2=- 2.92×10-4、A3=1.13 × 10-6、A4=1.524 × 10-8、A5=-0.34, A6=0.0025
IAM in temperature prediction model can be calculated as follows by computing module：
K in temperature prediction modelθb(θ) can be calculated as follows by computing module：：
In formula, f is heat collector focal length；L is the length of heat collector.
Q in temperature prediction modelloss,pipeIt can be calculated as follows by computing module：：
In formula, DoTo connect the external diameter after the duct wraps insulation material of heat collector；DiTo connect in the pipeline of heat collector Footpath；λ is the thermal conductivity of insulation material；α is the pipe surface heat transfer coefficient of connection heat collector；Ta1For default starting, end time Connection heat collector pipeline external surface temperature averages；Ta2For default starting, the environment temperature average value of end time.
Prediction module can be used for：
Heat collector optical efficiency actual value is substituted into temperature prediction model；
Slot type photo-thermal power station mirror field exit temperature prediction value T is calculated by temperature prediction modelout,cal, such as following formula：
In formula, Ge,calFor the beam radia prediction of strength value of period to be predicted；Tin,realFor the groove at current time Formula circuit entrance temperature.
Forecasting Methodology and system provided by the invention pass through the temperature that calculates heat collector optical efficiency actual value and build in advance Forecast model is spent, mirror field outlet temperature that can be in Accurate Prediction a period of time in future, this gathers for the slot type of adjustment control in time Light device tracks angle, prevents that conduction oil overtemperature, cracking etc. are significant in thermal-collecting tube.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program Product.Therefore, the application can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware Apply the form of example.Moreover, the application can use the computer for wherein including computer usable program code in one or more The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.) The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in individual square frame or multiple square frames.
Embodiments of the invention are these are only, are not intended to limit the invention, it is all in the spirit and principles in the present invention Within, any modification, equivalent substitution and improvements done etc., be all contained in apply pending scope of the presently claimed invention it It is interior.

Claims (13)

  1. A kind of 1. Forecasting Methodology of slot type photo-thermal power station mirror field outlet temperature, it is characterised in that including：
    Obtain the actual operation parameters in preset time period slot type photo-thermal power station；
    The actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature prediction model pre-established, with true Determine heat collector optical efficiency actual value；
    It is pre- according to the beam radia intensity of temperature prediction model, heat collector optical efficiency actual value and period to be predicted Measured value, determine slot type photo-thermal power station mirror field exit temperature prediction value.
  2. 2. the Forecasting Methodology of slot type photo-thermal power station mirror field as claimed in claim 1 outlet temperature, it is characterised in that will be described pre- If the actual operation parameters in period slot type photo-thermal power station substitute into temperature prediction model, to determine heat collector optical efficiency reality Value, including：
    The actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature prediction model such as following formula：
    <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>T</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mi>&amp;eta;K</mi> <mrow> <mi>&amp;theta;</mi> <mi>b</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> <msub> <mi>G</mi> <mi>e</mi> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> <mo>-</mo> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> <mo>-</mo> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> <mo>,</mo> <mi>p</mi> <mi>i</mi> <mi>p</mi> <mi>e</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> <mo>-</mo> <msub> <mi>C</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>o</mi> <mi>p</mi> </mrow> </msub> <mfrac> <mrow> <msub> <mi>dT</mi> <mi>m</mi> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> </mrow>
    In formula, actual operation parameters include：The slot type circuit entrance temperature T of default initial timein, the preset termination moment slot type Circuit outlet actual temperature Tout, heat-transfer fluid mean temperature TmAnd default starting, the relevant parameter of end time are averaged Value；The default starting, the relevant parameter average value of end time include heat-transfer fluid mass flow average valueHeat-transfer fluid Specific heat capacity average value cf, slot type loop thermal-arrest area average Aa, heat collector heat dissipation capacity average value Qloss, connection heat collector pipe Road heat dissipation capacity average value Qloss,pipeWith the hot melt average value C in slot type looploop；
    η is heat collector optical efficiency actual value；Kθb(θ) is the incident angle function of beam radia；GeFor beam radia Intensity；Tm=(Tout+Tin)/2；
    Heat collector optical efficiency actual value η is calculated according to the temperature prediction model.
  3. 3. the Forecasting Methodology of slot type photo-thermal power station mirror field as claimed in claim 2 outlet temperature, it is characterised in that the Qloss It is calculated as follows：
    <mrow> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>A</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>A</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>m</mi> </msub> <mo>-</mo> <msub> <mi>T</mi> <mi>a</mi> </msub> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>A</mi> <mn>2</mn> </msub> <msup> <msub> <mi>T</mi> <mi>m</mi> </msub> <mn>2</mn> </msup> <mo>+</mo> <msub> <mi>A</mi> <mn>3</mn> </msub> <msup> <msub> <mi>T</mi> <mi>m</mi> </msub> <mn>3</mn> </msup> <mo>+</mo> <msub> <mi>A</mi> <mn>4</mn> </msub> <msup> <msub> <mi>T</mi> <mi>m</mi> </msub> <mn>2</mn> </msup> <msub> <mi>G</mi> <mi>e</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> <mi>I</mi> <mi>A</mi> <mi>M</mi> <mo>+</mo> <msqrt> <msub> <mi>V</mi> <mi>w</mi> </msub> </msqrt> <mrow> <mo>(</mo> <msub> <mi>A</mi> <mn>5</mn> </msub> <mo>+</mo> <msub> <mi>A</mi> <mn>6</mn> </msub> <mo>(</mo> <mrow> <msub> <mi>T</mi> <mi>m</mi> </msub> <mo>-</mo> <msub> <mi>T</mi> <mi>a</mi> </msub> </mrow> <mo>)</mo> <mo>)</mo> </mrow> </mrow>
    In formula, θ is default starting, the beam radia incidence angle average value of end time；IAM is incident angle modifier；Vw For default starting, the ambient wind velocity average value of end time；A0~A6For the design factor of thermal-collecting tube heat dissipation capacity；TaTo preset Begin, the environment temperature average value of end time.
  4. 4. the Forecasting Methodology of slot type photo-thermal power station mirror field as claimed in claim 3 outlet temperature, it is characterised in that the A0= 0.357、A1=0.0524, A2=-2.96 × 10-4、A3=1.126 × 10-6、A4=1.068 × 10-8、A5=-0.0224, A6= 0.002012, or A0=0.801, A1=0.0494, A2=-2.92 × 10-4、A3=1.13 × 10-6、A4=1.524 × 10-8、 A5=-0.34, A6=0.0025.
  5. 5. the Forecasting Methodology of prediction slot type photo-thermal power station mirror field outlet temperature as claimed in claim 3, it is characterised in that described IAM is calculated as follows：
    <mrow> <mi>I</mi> <mi>&amp;Lambda;</mi> <mi>M</mi> <mo>=</mo> <mn>1</mn> <mo>+</mo> <mn>0.000884</mn> <mfrac> <mi>&amp;theta;</mi> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>-</mo> <mn>0.00005369</mn> <mfrac> <msup> <mi>&amp;theta;</mi> <mn>2</mn> </msup> <mrow> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>.</mo> </mrow>
  6. 6. the Forecasting Methodology of prediction slot type photo-thermal power station mirror field outlet temperature as claimed in claim 4, it is characterised in that described Kθb(θ) is calculated as follows：
    <mrow> <msub> <mi>K</mi> <mrow> <mi>&amp;theta;</mi> <mi>b</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> <mo>=</mo> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> <mi>I</mi> <mi>A</mi> <mi>M</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mi>f</mi> <mi>L</mi> </mfrac> <mi>t</mi> <mi>a</mi> <mi>n</mi> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> <mo>)</mo> </mrow> </mrow>
    In formula, f is heat collector focal length；L is the length of heat collector.
  7. 7. the Forecasting Methodology of slot type photo-thermal power station mirror field as claimed in claim 2 outlet temperature, it is characterised in that described Qloss,pipeIt is calculated as follows：
    <mrow> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> <mo>,</mo> <mi>p</mi> <mi>i</mi> <mi>p</mi> <mi>e</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mrow> <mi>a</mi> <mn>1</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>T</mi> <mrow> <mi>a</mi> <mn>2</mn> </mrow> </msub> <mo>)</mo> </mrow> </mrow> <mrow> <mfrac> <mn>1</mn> <mi>&amp;lambda;</mi> </mfrac> <mi>l</mi> <mi>n</mi> <mfrac> <msub> <mi>D</mi> <mi>o</mi> </msub> <msub> <mi>D</mi> <mi>i</mi> </msub> </mfrac> <mo>+</mo> <mfrac> <mn>2</mn> <mrow> <msub> <mi>&amp;alpha;D</mi> <mi>o</mi> </msub> </mrow> </mfrac> </mrow> </mfrac> </mrow>
    In formula, DoTo connect the external diameter after the duct wraps insulation material of heat collector；DiTo connect the internal diameter of the pipeline of heat collector；λ is The thermal conductivity of insulation material；α is the pipe surface heat transfer coefficient of connection heat collector；Ta1For default starting, the connection of end time The pipeline external surface temperature averages of heat collector；Ta2For default starting, the environment temperature average value of end time.
  8. 8. the Forecasting Methodology of slot type photo-thermal power station mirror field as claimed in claim 2 outlet temperature, it is characterised in that according to temperature The beam radia prediction of strength value of forecast model, heat collector optical efficiency actual value and period to be predicted, determines groove Formula photo-thermal power station mirror field exit temperature prediction value includes：
    Heat collector optical efficiency actual value is substituted into temperature prediction model；
    Slot type photo-thermal power station mirror field exit temperature prediction value T is calculated by temperature prediction modelout,cal, such as following formula：
    <mrow> <msub> <mi>T</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> <mo>,</mo> <mi>c</mi> <mi>a</mi> <mi>l</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&amp;eta;K</mi> <mrow> <mi>&amp;theta;</mi> <mi>b</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> <msub> <mi>G</mi> <mrow> <mi>e</mi> <mo>,</mo> <mi>c</mi> <mi>a</mi> <mi>l</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> </mrow> <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> </mrow> </mfrac> <mo>-</mo> <mfrac> <mrow> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> </mrow> <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> </mrow> </mfrac> <mo>-</mo> <mfrac> <mrow> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> <mo>,</mo> <mi>p</mi> <mi>i</mi> <mi>p</mi> <mi>e</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> </mrow> <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> </mrow> </mfrac> <mo>-</mo> <mfrac> <msub> <mi>C</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>o</mi> <mi>p</mi> </mrow> </msub> <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> </mrow> </mfrac> <mfrac> <mrow> <msub> <mi>dT</mi> <mi>m</mi> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>+</mo> <msub> <mi>T</mi> <mrow> <mi>i</mi> <mi>n</mi> <mo>,</mo> <mi>r</mi> <mi>e</mi> <mi>a</mi> <mi>l</mi> </mrow> </msub> </mrow>
    In formula, Ge,calFor the beam radia prediction of strength value of period to be predicted；Tin,realReturned for the slot type at current time Road inlet temperature.
  9. A kind of 9. forecasting system of slot type photo-thermal power station mirror field outlet temperature, it is characterised in that including：
    Acquisition module, obtain the actual operation parameters in preset time period slot type photo-thermal power station；
    Computing module, the actual operation parameters in the preset time period slot type photo-thermal power station are substituted into the temperature prediction pre-established Model, to determine heat collector optical efficiency actual value；
    Prediction module, according to the direct sunlight of temperature prediction model, heat collector optical efficiency actual value and period to be predicted Radiation intensity predicted value, determine slot type photo-thermal power station mirror field exit temperature prediction value；
    Modeling module, for pre-establishing and storage temperature forecast model.
  10. 10. the forecasting system of slot type photo-thermal power station mirror field as claimed in claim 9 outlet temperature, it is characterised in that described to adopt Collect the actual operation parameters that module obtains preset time period slot type photo-thermal power station, including：
    The slot type circuit entrance temperature T of default initial timein, the preset termination moment slot type circuit outlet actual temperature Tout, pass The mean temperature T of hot fluidmAnd default starting, the relevant parameter average value of end time；The default starting, end time Relevant parameter average value include heat-transfer fluid mass flow average valueHeat-transfer fluid specific heat capacity average value cf, slot type loop collection Hot area average Aa, heat collector heat dissipation capacity average value Qloss, connection heat collector pipe heat dissipation average value Qloss,pipeAnd groove The hot melt average value C in formula looploop。
  11. 11. the forecasting system of slot type photo-thermal power station mirror field as claimed in claim 10 outlet temperature, it is characterised in that described to build Mould module, for building the temperature prediction model such as following formula：
    <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>T</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mi>&amp;eta;K</mi> <mrow> <mi>&amp;theta;</mi> <mi>b</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> <msub> <mi>G</mi> <mi>e</mi> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> <mo>-</mo> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> <mo>-</mo> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> <mo>,</mo> <mi>p</mi> <mi>i</mi> <mi>p</mi> <mi>e</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> <mo>-</mo> <msub> <mi>C</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>o</mi> <mi>p</mi> </mrow> </msub> <mfrac> <mrow> <msub> <mi>dT</mi> <mi>m</mi> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> </mrow>
    In formula, η is heat collector optical efficiency actual value；Kθb(θ) is the incident angle function of beam radia；GeFor direct sunlight Radiation intensity；Tm=(Tout+Tin)/2。
  12. 12. the forecasting system of slot type photo-thermal power station mirror field as claimed in claim 11 outlet temperature, it is characterised in that the meter Module is calculated, for the actual operation parameters in the preset time period slot type photo-thermal power station to be substituted into temperature prediction model and calculate collection Hot device optical efficiency actual value.
  13. 13. the forecasting system of slot type photo-thermal power station mirror field as claimed in claim 12 outlet temperature, it is characterised in that described pre- Module is surveyed to be used for,
    Heat collector optical efficiency actual value is substituted into temperature prediction model；
    Slot type photo-thermal power station mirror field exit temperature prediction value T is calculated by temperature prediction modelout,cal, such as following formula：
    <mrow> <msub> <mi>T</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> <mo>,</mo> <mi>c</mi> <mi>a</mi> <mi>l</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&amp;eta;K</mi> <mrow> <mi>&amp;theta;</mi> <mi>b</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> <msub> <mi>G</mi> <mrow> <mi>e</mi> <mo>,</mo> <mi>c</mi> <mi>a</mi> <mi>l</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> </mrow> <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> </mrow> </mfrac> <mo>-</mo> <mfrac> <mrow> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> </mrow> <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> </mrow> </mfrac> <mo>-</mo> <mfrac> <mrow> <msub> <mi>Q</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>s</mi> <mi>s</mi> <mo>,</mo> <mi>p</mi> <mi>i</mi> <mi>p</mi> <mi>e</mi> </mrow> </msub> <msub> <mi>A</mi> <mi>a</mi> </msub> </mrow> <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> </mrow> </mfrac> <mo>-</mo> <mfrac> <msub> <mi>C</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>o</mi> <mi>p</mi> </mrow> </msub> <mrow> <mover> <mi>m</mi> <mo>&amp;CenterDot;</mo> </mover> <msub> <mi>c</mi> <mi>f</mi> </msub> </mrow> </mfrac> <mfrac> <mrow> <msub> <mi>dT</mi> <mi>m</mi> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>+</mo> <msub> <mi>T</mi> <mrow> <mi>i</mi> <mi>n</mi> <mo>,</mo> <mi>r</mi> <mi>e</mi> <mi>a</mi> <mi>l</mi> </mrow> </msub> </mrow>
    In formula, Ge,calFor the beam radia prediction of strength value of period to be predicted；Tin,realReturned for the slot type at current time Road inlet temperature.
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CN109520159A (en) * 2018-10-16 2019-03-26 北京拉夫堡太阳能技术有限公司 A kind of temprature control method and system of solar energy heat collection pipe
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