CN109141541A - A kind of coal-fired power station boiler reheater working medium flow on-line correction method - Google Patents

A kind of coal-fired power station boiler reheater working medium flow on-line correction method Download PDF

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CN109141541A
CN109141541A CN201810750479.9A CN201810750479A CN109141541A CN 109141541 A CN109141541 A CN 109141541A CN 201810750479 A CN201810750479 A CN 201810750479A CN 109141541 A CN109141541 A CN 109141541A
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working medium
boiler
flow
energy
reheater
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史元浩
崔方舒
温杰
庞晓琼
贾建芳
曾建潮
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North University of China
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North University of China
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00Details of, or accessories for, apparatus of the preceding groups insofar as such details or appliances are not adapted to particular types of such apparatus
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00Details of, or accessories for, apparatus of the preceding groups insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02Compensating or correcting for variations in pressure, density or temperature

Abstract

The invention discloses a kind of coal-fired power station boiler reheater working medium flow on-line correction method, chooses and obtain relevant boiler operatiopn data in real time from the engineer station in Boiler Distributed Control System DCS after the fixed sampling time;Working medium physical parameter library is established for water and steam enthalpy in line computation;The design parameter for the superheater system that boiler is related to is set according to boiler design drawing;Bad point processing and data smoothing processing are carried out to the operating parameter of collected boiler;Establish boiler heat regenerative system working medium quality and energy-balance equation based on quality and energy balance;The accumulation of heat for changing lower working medium and metal heated face according to temperature, pressure changes energy-balance equation described in amendment step four;The temperature, pressure, flow of each measuring point of reheater system are obtained from measuring point;Temperature of Working, pressure, traffic related data;In conjunction with after correction quality and energy-balance equation simultaneous acquire firsts and seconds pumping sucking rate, finally obtain correction after reheater working medium flow.

Description

A kind of coal-fired power station boiler reheater working medium flow on-line correction method
Technical field
The present invention relates to electric power and technical field of information processing, especially a kind of coal-fired power station boiler reheater working medium flow On-line correction method.
Background technique
The power supply in China is based on coal fired power generation, and this situation will not be sent out within expected a very long time It is raw to change.Therefore, how coal-fired electricity is excavated on the basis of guaranteeing safety in production the today being more taken seriously in energy-saving and emission-reduction The potentiality for the energy-saving and emission-reduction stood are problems to be solved.Boiler is one of three big core equipments of fossil power plant, and The key object of entire power station energy-saving and emission-reduction.Optimizing control to coal fired generation process is to realize the important means of energy-saving and emission-reduction One of, and realize this target and need first coal fired generation process accurately monitor in real time.As China automates Universal, China's coal fired power generation enterprise of horizontal raising and Distributed Control System (Distributed Control System, DCS) The real-time measurement of the process data of industry production process has obtained significantly guaranteeing.But with control and optimize mentioning for demand Height, to the real-time accurate measurements of coal fired power plant production process, more stringent requirements are proposed.
To improve the thermal efficiency, most of coal-fired power station boiler all uses reheater system at present in China.Reheater is first is that can To reduce the humidity of vapor, be conducive to protect turbine blade;Second is that can entire unit internal efficiency ratio and absolutely in Efficiency.It flows through the working medium flow of reheater and main steam flow is designed, but due to the complexity of actual production operating condition, very When more can not in strict conformity with design proportion, and will the key indexes such as heat exchange efficiency to reheater system carry out in line computation Need accurate superheater working medium flow data.
But working medium flow measurement point is not pre-designed and reserved inside many coal fired power plant superheaters in China, this just leads It has caused directly measure the working medium flow data obtained inside superheater.Such as pass through main steam flow according to the ratio of realization design Amount is then not accurate enough to directly acquire superheater working medium flow, and control higher for some pairs of required precisions and optimization method are then It is unable to reach requirement.
It is found through being retrieved to existing literature, Chinese Patent Application No. ZL201410025222.9 proposes a kind of " thermal motor Group mesolow cylinder entrance reheat heat steam mass flow real time measure method ", this method is by establishing reheating Passage parameter Database and related data establish reheating channel working medium mass budget model, and mesolow cylinder entrance can be monitored in real time Reheat heat steam mass flow.However this method does not consider heater condensate at different levels in reheater channel, heat regenerative system etc. Pipeline caused by the temperature, pressure of hot switching path changes and working medium accumulation of heat variation, such that calculated result exists centainly Error, real-time control higher for required precision or optimization have certain limitation.
" the nonlinear mathematical model and calculation of Wall Temperature side of boiler superheater and reheater assignment of traffic that poplar winter et al. proposes Method " imports and exports the relationship between pressure drop according to each parallel transistor, establishes the non-linear number of boiler superheater, reheater assignment of traffic Learn model.Empirical parameter used in the model is less, computational accuracy with higher.But this method is emphatically with superheater and again The assignment problem of hot device flow is right not in view of the influence that the factors such as reheater heat regenerative system pumping generate working medium flow There is certain limitation in higher required precision.
Summary of the invention
The invention aims to solve the deficiencies in the prior art, a kind of coal-fired power station boiler reheater work is provided Mass flow amount on-line correction method, the working medium flow of real-time measurement and correction coal-fired power station boiler reheater do not have to additional addition and survey Equipment is measured, can be that the boiler implosion for being related to reheater working medium flow and optimization lay the foundation.
In order to achieve the above objectives, the present invention is implemented according to following technical scheme:
A kind of coal-fired power station boiler reheater working medium flow on-line correction method, comprising the following steps:
Step 1: choose the fixed sampling time, by OPC communications protocol from the work in Boiler Distributed Control System DCS Cheng Shizhan obtains relevant boiler operatiopn data in real time;
Step 2: the IAPWS-IF97 formula based on water and steam thermodynamic properties, establishes working medium physical property for its vectorization Parameter library is for water and steam enthalpy in line computation;According to boiler design drawing, the superheater system that boiler is related to is set Design parameter, mainly include heating surface metal model, heat exchanger tube internal-and external diameter, sectional area;
Step 3: the operating parameter to collected boiler carries out bad point processing and data smoothing processing, to obtain everywhere The real-time data base of boiler reheater system correlation operating parameter after reason;
Step 4: establishing boiler heat regenerative system working medium quality and energy-balance equation based on quality and energy balance, root According to energy and mass balance principle, the caloric receptivity for flowing through the water supply of 1# high-pressure heater and 2# high-pressure heater is respectively 1 grade of pumping The thermal discharge of gas and 2 grades of pumpings, quality and energy-balance equation respectively indicate are as follows:
mfw(hout1-hin1)=me1(hs1-hh1)
mfw(hout2-hin2)=me2(hs2-hh2)+me1(hh1-hh2),
Wherein, hout1And hout2The respectively Enthalpy of Feed Water of 1# high-pressure heater and the outlet of 2# high-pressure heater, kJ;
hin1And hin1The respectively Enthalpy of Feed Water of 1# high-pressure heater and 2# inlet of high pressure heater, kJ;
hs1And hh1The respectively steam enthalpy of 1# inlet of high pressure heater and hydrophobic enthalpy, kJ;
hs2And hh2The respectively steam enthalpy of 2# inlet of high pressure heater and hydrophobic enthalpy, kJ;
mfw、me1And me2The respectively feedwater flow of boiler system, the steam flow of level-one pumping and the steaming of second level pumping Steam flow amount, t/h;
Step 5: changing energy described in amendment step four according to the accumulation of heat that temperature, pressure changes lower working medium and metal heated face Measure equilibrium equation: the quality and energy-balance equation after correction are as follows:
mfw(hout1-hin1)+DQh1=me1(hs1-hh1)+DQe1
mfw(hout2-hin2)+DQh2=me2(hs2-hh2)+DQe1+me1(hh1-hh2)+DQe1,
Wherein DQh1For the accumulation of heat variable quantity in the metal heated face of 1# high-pressure heater, D Qh2For 2# high-pressure heater metal by The accumulation of heat variable quantity in hot face, D Qe1For the working medium accumulation of heat variable quantity of level-one pumping, D Qe2For the working medium accumulation of heat variation of second level pumping Amount;
When operating condition is steady, metal heated face and working medium operating condition are steady, and temperature, pressure are basically unchanged, then D Qh1D Qh2D Qe1With D Qe2It is 0;
When fluctuation of operating conditions,
C in formulaj、CqThe mean specific heat in respectively metal heated face and intraductal working medium, kJ/ (kg g℃);mh1、mh2Respectively 1# and 2# high-pressure heater tube wall metal quality, kg;me1、me2The matter of the working medium of 1 grade and 2 grades pumping Amount, kg;θh1, θh2Respectively 1# and 2# high-pressure heater tube wall temperature, DEG C;θe1, θe2The steam temperature of respectively 1 grade and 2 grades pumping Degree, DEG C;τ is the time;
Step 6: obtaining the temperature, pressure, flow of each measuring point of reheater system from measuring point;Temperature of Working, pressure, stream The related datas such as amount;In conjunction with after the correction in step 5 quality and energy-balance equation simultaneous acquire firsts and seconds pumping Sucking rate:
Wherein, hin1=hout2
Reheater working medium flow after finally obtaining correction as a result, are as follows:
mz=ms-me1-me2, in formula: mzAnd msRespectively indicate reheated steam flow and main steam flow.
As a preferred solution of the present invention, the sampling time is 30 seconds in the step 1.
Further, in the step 3, the described bad point processing be bad point is judged by Absolute mean value method, and to its into What row was rejected, specifically:
To zero-mean data sequence x0(t) the absolute value mean value of its data sample is found outW is determined multiplied by coefficient k Value, when | xiWhen | >=W, that is, think xiIt is the bad point in data sequence, is rejected, W is formulated are as follows:Wherein: k is experience value coefficient;
After Outlier rejeetion in data, substituted with absolute mean, it may be assumed that
The data smoothing processing is realized by the method that data weighting filters, specifically:
Wherein:For filtered result;ymFor the m moment Actual measured value.
The present invention, for since the water supply for entering boiler heat regenerative system, arrives on the basis of unit actual operating data Heat transfer process of the heat regenerative system to this section of economizer out, pumpings at different levels during considering and the working medium stream for removing condenser Amount carries out on-line correction to the working medium flow of reheater by the method for hard measurement using dynamic energy and mass balance;? On the basis of progress quality and energy balance, it is contemplated that fluctuation of operating conditions caused by load large-scope change during boiler for producing, By heating surface metal in this section of production process and working medium, the variation of energy accumulation is joined and is corrected under different operating conditions, is mentioned The accuracy of high hard measurement, it is final to realize to the online real-time soft measuring of reheater working medium flow and correction.Of the invention is real-time Hard measurement and on-line correction technology can preferably overcome existing measuring point deficiency, not account for the certain methods of fluctuation of operating conditions not Foot, more can accurately realize the on-line real time monitoring of coal fired power plant reheater systematic working medium flow, and do not need to install Additional measuring instrument has preferable versatility and robustness.Suitable for coal-fired power station boiler reheater system characteristic parameters Real-time monitoring and optimal control on this basis.
Compared with prior art, a kind of coal-fired power station boiler reheater working medium flow on-line correction method proposed by the present invention It is good with dynamic characteristic, while without the advantages of adding additional hardware;Real-time amendment has been carried out to energy-balance equation, it is contemplated that In the case of fluctuation of operating conditions, heating surface metal and working medium accumulation of heat variation improve the dynamic accuracy of method.Result of the invention is more Help preferably to be evaluated as boiler reheater operating condition overall energy-saving and emission-reduction optimal control offer support.
Detailed description of the invention
Fig. 1 is objective for implementation coal-fired power station boiler heat regenerative system flow diagram of the present invention.
Fig. 2 is that objective for implementation coal-fired power station boiler of the present invention is corrected calculated firsts and seconds sucking rate figure.
Fig. 3 is that objective for implementation coal-fired power station boiler hard measurement of the present invention corrects the reheater flow figure obtained.
Specific embodiment
The invention will be further described combined with specific embodiments below, in the illustrative examples and explanation of the invention For explaining the present invention, but it is not as a limitation of the invention.
Be illustrated firstly the need of to following embodiment: the boiler in the present embodiment is HG-1025/17.3-WM18 type, pot Furnace load 300MW, boiler using subcritical, Natural Circulation, a resuperheat, double arches list burner hearth, " W " flame combustion mode, Tail portion twin flue, gas baffle temperature adjustment, balanced draft, dry ash extraction, outdoor arrangement, all steel frame suspension type drum boiler.
Consider that reheater, heat regenerative system outside hot-fluid are distributed along pipe range and even circumferential;Exchanger tube wall metal only considers Radial heat exchange;Intraductal working medium is incompressible, and parameter uniformity on flow section.
The coal-fired power station boiler reheater working medium flow on-line correction method of the present embodiment, comprising the following steps:
Step 1: boiler DCS control system carries OPC server-side, and program of the embodiment of the present invention passes through OPC client reality When read boiler operation data, the sampling period be 30 seconds.
Main operation data includes feedwater flow, main steam flow.1# and 2# high-pressure heater inlet and outlet Temperature of Working, Pressure, flow etc..
Step 2: its vectorization is established working medium physical property by the IAPWS-IF97 formula based on water and steam thermodynamic properties Parameter library is for water and steam enthalpy in line computation;According to boiler design drawing, the superheater system that boiler is related to is set Design parameter, mainly include heating surface metal model, heat exchanger tube internal-and external diameter, sectional area etc..
All water and steam calculation of thermodynamics are based on IAPWS-IF97 formula in embodiment, which is international Water and steam calculation of thermodynamics formula, details are not described herein.This example can adjust its vectorization in real time in calculating process For calculating the data such as required working medium enthalpy, density.
Objective for implementation boiler declared working condition parameter is as shown in table 1:
The design parameter that boiler heat exchange face reheater system and bypath system is arranged is as shown in table 2.
2 boiler reheater of table and main bypath system major parameter
Step 3: biggish data are fluctuated to collected part and carry out bad point processing and data smoothing processing, will be handled Data afterwards are stored in boiler operating parameter real-time data base.
Bad point processing is bad point to be judged by Absolute mean value method, and rejected to it:
To zero-mean data sequence x0(t) the absolute value mean value of its data sample is found outW is determined multiplied by coefficient k Value, when | xiWhen | >=W, that is, think xiIt is the bad point in data sequence, it should be rejected.W is formulated are as follows:
Wherein: k is experience value coefficient;
After Outlier rejeetion in data, it can be substituted with absolute mean, it may be assumed that
Data smoothing processing is realized by the method that data weighting filters:
Wherein:For filtered result;ymFor the actual measured value at m moment.
Step 4: boiler heat regenerative system working medium quality and energy-balance equation based on quality and energy balance are established
For reheater system, the steam flow inside reheater is measured without direct measuring point, and main steam flow is There is measuring point, we can acquire the steam flow inside reheater by flexible measurement method.
Main steam heat regenerative system principle is as shown in Fig. 1, and for main steam after entering high pressure cylinder, acting expansion while can be through The process for going through a secondary steam extraction, the steam extracted can be sent to 1# and 2# high-pressure heater respectively and heat to water supply, so It is back to oxygen-eliminating device step by step again afterwards.Reheater can be sent to by leaving the steam to get off, further heated, be then sent to middle pressure Cylinder acting.
According to energy and mass balance principle, the caloric receptivity point of the water supply of 1# high-pressure heater and 2# high-pressure heater is flowed through Not Wei 1 grade pumping and 2 grades pumping thermal discharges, indicate are as follows:
mfw(hout1-hin1)=me1(hs1-hh1) (18)
mfw(hout2-hin2)=me2(hs2-hh2)+me1(hh1-hh2) (19)
Wherein, hout1And hout2The respectively Enthalpy of Feed Water of 1# high-pressure heater and the outlet of 2# high-pressure heater, kJ;
hin1And hin1The respectively Enthalpy of Feed Water of 1# high-pressure heater and 2# inlet of high pressure heater, kJ;
hs1And hh1The respectively steam enthalpy of 1# inlet of high pressure heater and hydrophobic enthalpy, kJ;
hs2And hh2The respectively steam enthalpy of 2# inlet of high pressure heater and hydrophobic enthalpy, kJ;
mfw、me1And me2The respectively feedwater flow of boiler system, the steam flow of level-one pumping and the steaming of second level pumping Steam flow amount, t/h;
Step 5: above-mentioned equilibrium equation is corrected according to the accumulation of heat variation that temperature, pressure changes lower working medium and metal heated face.
The accumulation of heat quantitative change in metal heated face and working medium in the case where in view of load large-scope change during boiler for producing Change, the quality and energy-balance equation after being corrected are as follows:
mfw(hout1-hin1)+DQh1=me1(hs1-hh1)+DQe1 (20)
mfw(hout2-hin2)+DQh2=me2(hs2-hh2)+DQe1+me1(hh1-hh2)+DQe1 (21)
Wherein D Qh1For the accumulation of heat variable quantity in the metal heated face of 1# high-pressure heater, D Qh2For 2# high-pressure heater metal The accumulation of heat variable quantity of heating surface, D Qe1For the working medium accumulation of heat variable quantity of level-one pumping, D Qe2Working medium accumulation of heat for second level pumping becomes Change amount.
When operating condition is steady, metal heated face and working medium operating condition are steady, and temperature, pressure are basically unchanged, then D Qh1DQh2D Qe1With D Qe2It is 0.Formula (20) (21) is equal to formula (18) (19).
When fluctuation of operating conditions,
C in formulaj、CqThe mean specific heat in respectively metal heated face and intraductal working medium, kJ/ (kg g DEG C);mh1、mh2Respectively For 1# and 2# high-pressure heater tube wall metal quality, kg;me1、me2The quality of the working medium of 1 grade and 2 grades pumping, kg;θh1, θh2Respectively For 1# and 2# high-pressure heater tube wall temperature, DEG C;θe1, θe2The vapor (steam) temperature of respectively 1 grade and 2 grades pumping, DEG C;τ is the time.
Step 6: the temperature, pressure, flow of each measuring point of reheater system are obtained from measuring point;Temperature of Working, pressure, stream The related datas such as amount;In conjunction in step 4 and step 5 formula (20) and (21) simultaneous acquire firsts and seconds pumping pumping Amount:
Wherein, hin1=hout2
Thus, it is possible to finally obtain the reheater working medium flow after correction are as follows:
mz=ms-me1-me2(28)
In formula: mzAnd msRespectively indicate reheated steam flow and main steam flow.
According to the design parameter of embodiment boiler, using the above method to one day real data of research object calculate one The steam flow result of grade pumping and second level pumping is as shown in Fig. 2.Reheated steam flow after hard measurement calculates correction is such as Shown in attached drawing 3.
The limitation that technical solution of the present invention is not limited to the above specific embodiments, it is all to do according to the technique and scheme of the present invention Technology deformation out, falls within the scope of protection of the present invention.

Claims (3)

1. a kind of coal-fired power station boiler reheater working medium flow on-line correction method, which comprises the following steps:
Step 1: choose the fixed sampling time, by OPC communications protocol from the engineer in Boiler Distributed Control System DCS It stands to obtain relevant boiler operatiopn data in real time;
Step 2: the IAPWS-IF97 formula based on water and steam thermodynamic properties, establishes working medium physical parameter for its vectorization Library is for water and steam enthalpy in line computation;According to boiler design drawing, setting for the superheater system that boiler is related to is set Parameter is counted, mainly includes heating surface metal model, heat exchanger tube internal-and external diameter, sectional area;
Step 3: the operating parameter to collected boiler carries out bad point processing and data smoothing processing, thus after obtaining processing Boiler reheater system correlation operating parameter real-time data base;
Step 4: boiler heat regenerative system working medium quality and energy-balance equation based on quality and energy balance are established, according to energy Amount and mass balance principle, the caloric receptivity for flowing through the water supply of 1# high-pressure heater and 2# high-pressure heater is respectively 1 grade of pumping and 2 The thermal discharge of grade pumping, quality and energy-balance equation respectively indicate are as follows:
mfw(hout1-hin1)=me1(hs1-hh1)
mfw(hout2-hin2)=me2(hs2-hh2)+me1(hh1-hh2),
Wherein, hout1And hout2The respectively Enthalpy of Feed Water of 1# high-pressure heater and the outlet of 2# high-pressure heater, kJ;
hin1And hin1The respectively Enthalpy of Feed Water of 1# high-pressure heater and 2# inlet of high pressure heater, kJ;
hs1And hh1The respectively steam enthalpy of 1# inlet of high pressure heater and hydrophobic enthalpy, kJ;
hs2And hh2The respectively steam enthalpy of 2# inlet of high pressure heater and hydrophobic enthalpy, kJ;
mfw、me1And me2The respectively feedwater flow of boiler system, the steam flow of level-one pumping and the steam stream of second level pumping Amount, t/h;
It is put down Step 5: changing energy described in amendment step four according to the accumulation of heat that temperature, pressure changes lower working medium and metal heated face Weigh equation: the quality and energy-balance equation after correction are as follows:
mfw(hout1-hin1)+D Qh1=me1(hs1-hh1)+D Qe1
mfw(hout2-hin2)+D Qh2=me2(hs2-hh2)+D Qe1+me1(hh1-hh2)+D Qe1,
Wherein D Qh1For the accumulation of heat variable quantity in the metal heated face of 1# high-pressure heater, D Qh2For the metal heated face of 2# high-pressure heater Accumulation of heat variable quantity, D Qe1For the working medium accumulation of heat variable quantity of level-one pumping, D Qe2For the working medium accumulation of heat variable quantity of second level pumping;
When operating condition is steady, metal heated face and working medium operating condition are steady, and temperature, pressure are basically unchanged, then D Qh1D Qh2D Qe1With D Qe2It is 0;
When fluctuation of operating conditions,
C in formulaj、CqThe mean specific heat in respectively metal heated face and intraductal working medium, kJ/ (kgg DEG C); mh1、mh2Respectively 1# and 2# high-pressure heater tube wall metal quality, kg;me1、me2The quality of the working medium of 1 grade and 2 grades pumping, kg; θh1, θh2Respectively 1# and 2# high-pressure heater tube wall temperature, DEG C;θe1, θe2The vapor (steam) temperature of respectively 1 grade and 2 grades pumping, DEG C; τ is the time;
Step 6: obtaining the temperature, pressure, flow of each measuring point of reheater system from measuring point;Temperature of Working, pressure, flow phase Close data;In conjunction with after the correction in step 5 quality and energy-balance equation simultaneous acquire firsts and seconds pumping sucking rate:
Wherein, hin1=hout2
Reheater working medium flow after finally obtaining correction as a result, are as follows:
mz=ms-me1-me2, in formula: mzAnd msRespectively indicate reheated steam flow and main steam flow.
2. coal-fired power station boiler reheater working medium flow on-line correction method according to claim 1, it is characterised in that: institute Stating the sampling time in step 1 is 30 seconds.
3. coal-fired power station boiler reheater working medium flow on-line correction method according to claim 1, it is characterised in that: institute It states in step 3, the bad point processing is bad point to be judged by Absolute mean value method, and rejected to it, specifically:
To zero-mean data sequence x0(t) the absolute value mean value of its data sample is found outW value is determined multiplied by coefficient k, when |xiWhen | >=W, that is, think xiIt is the bad point in data sequence, is rejected, W is formulated are as follows:Its In: k is experience value coefficient;
After Outlier rejeetion in data, substituted with absolute mean, it may be assumed that
The data smoothing processing is realized by the method that data weighting filters, specifically:
Wherein:For filtered result;ymFor the reality at m moment Border measured value.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110274627A (en) * 2019-06-25 2019-09-24 西安交通大学 The measurement method of interior high temperature and pressure working medium flow distribution is restrained in parallel connection
CN110274627B (en) * 2019-06-25 2020-06-19 西安交通大学 Measuring method for high-temperature and high-pressure working medium flow distribution in parallel tube bundle
CN110361064A (en) * 2019-06-26 2019-10-22 贵州茅台酒股份有限公司 Ground pot saturated steam flow metering system
CN112178616A (en) * 2020-10-17 2021-01-05 西安交通大学 Coal-fired unit control method considering heat storage space-time distribution

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