CN112395817A - Method for calculating pipeline efficiency of power plant on line based on real-time data - Google Patents

Method for calculating pipeline efficiency of power plant on line based on real-time data Download PDF

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CN112395817A
CN112395817A CN202011290128.8A CN202011290128A CN112395817A CN 112395817 A CN112395817 A CN 112395817A CN 202011290128 A CN202011290128 A CN 202011290128A CN 112395817 A CN112395817 A CN 112395817A
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罗睿
王智微
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Xian Thermal Power Research Institute Co Ltd
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Abstract

The invention discloses a method for calculating pipeline efficiency of a power plant on line based on real-time data. The method can effectively utilize real-time monitoring data of the power plant, considers the real-time fluctuation condition of the working condition parameters, gives a real-time calculation solution by analyzing the reasons of the state parameter difference of the inlet and the outlet of the pipeline, and provides data support for the online calculation and evaluation of the pipeline efficiency of the power plant.

Description

Method for calculating pipeline efficiency of power plant on line based on real-time data
Technical Field
The invention relates to the technical field of big data application of enterprises in the energy and power industry, in particular to a method for calculating pipeline efficiency of a power plant on line based on real-time data.
Background
The operation economy index of the thermal system of the power plant has important reference value for evaluating and optimizing and adjusting the unit operation level. On a plant-level monitoring information system and other large data application platforms, main economic indicators of power generation coal consumption and power supply coal consumption are calculated on line, and boiler efficiency, steam turbine heat consumption, pipeline efficiency, plant power consumption and the like need to be calculated in real time. The current common treatment methods are: the boiler efficiency, the steam turbine heat consumption and the plant power consumption are obtained through online real-time calculation, but the pipeline efficiency is replaced by a design value or a constant, and then real-time power generation coal consumption and power supply coal consumption indexes are obtained through estimation.
The coal consumption index obtained in this way lacks persuasion of index accuracy due to rough processing of pipeline efficiency; meanwhile, the evaluation of online real-time indexes is lacked in the pipeline system link, and the performance and the design of the pipeline system of the generator set cannot be judged. And when the statistical calculation is carried out under a stable working condition or in a certain period, an accurate result can be obtained according to an industry standard and a literature calculation formula. However, during on-line calculation, fluctuation of real-time state parameters cannot be avoided, particularly when the working condition is unstable, steam parameters change in real time, and the steam parameters at the outlet of the boiler and the steam parameters at the inlet of the steam turbine are not state parameters of the same working medium at the same time node; the heat loss part of the pipeline efficiency is small, and the fluctuation of the steam state parameters obviously affects the tiny heat loss, so that the calculation result of the pipeline efficiency is affected, and even an unreasonable numerical value appears.
Disclosure of Invention
In order to make up the technical defect that the pipeline efficiency is calculated on line by utilizing real-time data, the invention aims to provide the method for calculating the pipeline efficiency of the power plant on line based on the real-time data.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for calculating the pipeline efficiency of a power plant on line based on real-time data is characterized by determining real-time data parameters under a time dimension, considering the flow time in a steam pipeline and establishing a pipeline efficiency on-line calculation formula under a real-time state;
the method comprises the following steps: based on a power plant real-time production data monitoring platform, selecting steam thermodynamic real-time monitoring parameters of an outlet of a main steam pipeline of a boiler:
step two: calculating the flow time of steam in the pipeline, and determining the time corresponding to each parameter for calculating the pipeline efficiency in real time;
step three: establishing a real-time calculation formula of the pipeline efficiency of the power plant under the consideration of the time dimension: according to the current t0Calculating t according to steam thermodynamic parameters of the pipeline entering the steam turbine at the moment0Main steam enthalpy and reheat steam enthalpy at the steam turbine inlet at the moment; calculating t according to steam thermodynamic parameters of the boiler steam outlet at the time of forward deviation of steam flow time delta t to enter the pipeline0-main steam enthalpy and reheat steam enthalpy at the boiler outlet at time Δ t; based on the above results, t is calculated0Instantaneous pipeline real-time efficiency etap(t0)。
The steam thermodynamics real-time monitoring parameters in the step one specifically comprise:
main steam pressure pb,msMain steam temperature Tb,msMain steam flow F of boilerb,ms(ii) a Selecting steam thermodynamic real-time monitoring parameters of a steam turbine main valve inlet: main steam pressure pt,msMain steam temperature Tt,msMain steam flow F of steam turbinet,ms；
According to the actual reheating times i, generally i is 1 or 2, of the thermodynamic system of the power plant, selecting the steam thermodynamic real-time monitoring parameters of all boiler reheating steam pipeline outlets: reheat steam pressure pb,rh,iTemperature T of reheat steamb,rh,iBoiler reheat steam flow rate Fb,rh,i(ii) a Selecting steam thermodynamic real-time monitoring parameters of all steam turbine reheating valve inlets: reheat steam pressure pt,rh,iTemperature T of reheat steamt,rh,iFlow rate of reheat steam F of steam turbinet,rh,i；
The unit of the above parameters is: the pressure unit is MPa, the temperature unit is DEG, and the flow unit is t/h.
In the second step, the time corresponding to each parameter used for calculating the pipeline efficiency in real time is determined by the following specific scheme:
(1) obtaining the total length L of the pipeline from the main steam outlet of the boiler to the main steam inlet of the steam turbine according to the site pipeline layout drawing and the design informationmsThe unit m; total length L of pipeline from each reheat steam outlet of boiler to corresponding reheat steam inlet of steam turbinerh,iThe unit m, in general i, is 1 or2, keeping the actual reheating frequency i consistent with the actual reheating frequency i of the step one;
(2) calculating the volume flow of the steam in the pipeline;
according to thermodynamic parameters state pressure and temperature, looking up a table or an approximate formula, calculating to obtain steam specific volume v, m3/kg；
v＝f(p,T)
Carrying out average treatment on the steam specific volumes respectively obtained by the thermodynamic parameters of the outlet of the boiler steam pipeline and the thermodynamic parameters of the inlet of the steam turbine steam pipeline to obtain the average specific volume of the steam in the pipeline;
vms＝0.5(f(pb,ms,Tb,ms)+f(pt,ms,Tt,ms)
vrh，i＝0.5(f(pb，rh，i，Tb，rh，i)+f(pt，rh，i，Tt，rh，i)
Figure BDA0002783541490000041
Figure BDA0002783541490000042
νmsaverage steam specific volume, m, of the main steam line3/kg；
νrh,i-average steam specific volume, m, of i reheat steam lines3/kg；
VmsVolume flow of the main steam line, m3/s；
Vrh,i-volume flow of i reheat steam lines, m3/s；
Wherein the main steam volume flow V is calculatedmsMass flow F usedb,msDetermining according to a field measuring point; calculating the volume flow V of each reheated steamrh,iMass flow F usedb,rh,iThe heat balance is calculated by a field measuring point or a steam turbine air extraction heat balance method;
(3) according to the main steamPipe diameter D of pipelinemsAnd the pipe diameter D of each reheating steam pipelinerh,iThe flow rate of steam in the pipe is calculated according to the following formula:
Figure BDA0002783541490000043
Figure BDA0002783541490000044
Dmsthe inner diameter of the main steam line, m;
Drh,i-the inner diameter of the i reheat steam lines, m;
ums-the steam flow rate of the main steam line, m/s;
urh,i-steam flow rate of i reheat steam lines, m/s;
(4) calculating the flow time of each steam in the pipeline from the boiler outlet to the steam turbine inlet section as follows:
Figure BDA0002783541490000051
Figure BDA0002783541490000052
Δtms-the flow time, s, of the main steam from the boiler tube outlet to the steam turbine main port inlet;
Δtrh，i-the flow time, s, of i reheat steam from boiler tube outlet to inlet of the steam turbine reheat valve.
T in the third step0Instantaneous pipeline real-time efficiency etap(t0) (ii) a The detailed formula is as follows:
h1，ms(t0)＝G(pt，ms(t0)，Tt，ms(t0))
h2，ms(t0-Δtms)＝G(pb，ms(t0-Δtms)，Tb，ms(t0-Δtms))
h1，rh，i(t0)＝G(pt，rh，i(t0)，Tt，rh，i(t0))
h2，rh，i(t0-Δtrh，i)＝G(pb，rh，i(t0-Δtrh，i)，Tb，rh，i(t0-Δtrh，i))
Figure BDA0002783541490000053
h1，ms(t0)——t0the enthalpy of main steam at the inlet pipeline of the steam turbine at the moment is kJ/kg;
h2，ms(t0-Δtms)——t0-Δtmsthe enthalpy of main steam at the outlet pipeline of the boiler is kJ/kg at the moment;
h1，rh，i(t0)——t0enthalpy of i times of reheat steam at an inlet pipeline of the steam turbine at the moment, kJ/kg;
h2，rh，i(t0-Δtrh，i)——t0-Δtrh，ienthalpy of i times of reheat steam at a boiler outlet pipeline at the moment, kJ/kg;
ηp(t0)——t0power plant pipeline efficiency,%;
g, calculating or looking up a table according to the steam pressure and the temperature to obtain a function corresponding to the enthalpy value;
pt，ms(t0)，Tt，ms(t0)——t0the main steam pressure, MPa, and main steam temperature, DEG C, at the steam turbine inlet at the moment;
pt,rh,i(t0)，Tt,rh,i(t0)——t0at the moment, the pressure of i times of reheat steam at the inlet of the steam turbine is MPa, and the temperature of i times of reheat steam is in DEG C;
pb,ms(t0-Δtms)，Tb,ms(t0-Δtms)——t0-Δtmsthe main steam pressure, MPa, and main steam temperature, DEG C, at the boiler outlet at the moment;
pb,rh,i(t0-Δtrh,i)，Tb,rh,i(t0-Δtrh,i)——t0-Δtrh,ithe pressure of i reheat steam at the boiler outlet at the moment is MPa, and the temperature of the i reheat steam is in DEG C.
Calculating t0At any moment when pipeline efficiency is high, t needs to be called from a real-time database0-ΔtmsTime and t0-Δtrh,iThe real-time parameters of the time are the compressibility of the database and the frequency of data acquisition, and if the time of the database has no specific numerical value, the preferable scheme is a forward interpolation method, namely, the latest historical value stored in the database before the time is selected.
The invention has the beneficial effects that:
in a real-time calculation index system of a power plant, the pipeline efficiency at the present stage is usually used as 1 default constant, and the invention provides a method for calculating the pipeline efficiency on line;
meanwhile, in the previous attempt of calculating the pipeline efficiency in real time, because the fluctuation of real-time state parameters is unavoidable, particularly the steam parameters change in real time, the steam parameters at the outlet of a boiler and the steam parameters at the inlet of a steam turbine are not the state parameters of the same working medium at the same time node, so that the calculation result of the pipeline efficiency is influenced, even unreasonable numerical values appear, and the actual application value of the on-line calculation of the pipeline efficiency is influenced; the calculation method provided by the invention considers the flowing time of steam in the pipeline, carries out time dimension processing and repairing on the fluctuation influence of the steam parameters in the calculation process, and improves the accuracy of the calculation result.
Detailed Description
The present invention will be described in further detail with reference to examples.
A method for calculating pipeline efficiency of a power plant on line based on real-time data comprises the following steps of selecting real-time calculation parameters, determining time scales of the real-time parameters and a calculation formula of the pipeline efficiency at each moment:
the method comprises the following steps: based on a power plant real-time production data monitoring platform, selecting steam thermodynamic real-time monitoring parameters of an outlet of a main steam pipeline of a boiler:
main steam pressure pb,msMain steam temperature Tb,msMain steam flow F of boilerb,ms(ii) a Selecting steam thermodynamic real-time monitoring parameters of a steam turbine main valve inlet: main steam pressure pt,ms，
Temperature T of main steamt,msMain steam flow F of steam turbinet,ms；
According to the actual reheating times i, generally i is 1 or 2, of the thermodynamic system of the power plant, selecting the steam thermodynamic real-time monitoring parameters of all boiler reheating steam pipeline outlets: reheat steam pressure pb,rh,iTemperature T of reheat steamb,rh,iBoiler reheat steam flow rate Fb,rh,i(ii) a Selecting steam thermodynamic real-time monitoring parameters of all steam turbine reheating valve inlets: reheat steam pressure pt,rh,iTemperature T of reheat steamt,rh,iFlow rate of reheat steam F of steam turbinet,rh,i；
The unit of the above parameters is: the pressure unit is MPa, the temperature unit is DEG, and the flow unit is t/h;
step two: calculating the flow time of steam in the pipeline, and determining the time corresponding to each parameter for calculating the pipeline efficiency in real time, wherein the specific determination scheme is as follows:
(1) obtaining the total length L of the pipeline from the main steam outlet of the boiler to the main steam inlet of the steam turbine according to the site pipeline layout drawing and the design informationmsThe unit m; total length L of pipeline from each reheat steam outlet of boiler to corresponding reheat steam inlet of steam turbinerh,iThe unit m, generally i is 1 or 2, and is consistent with the actual reheating frequency i of the step one;
(2) calculating the volume flow of the steam in the pipeline;
according to thermodynamic parameters of state pressure and temperature, a table is looked up or an approximate formula is searched, and the specific volume v, m of steam is obtained through calculation3/kg；
v＝f(p，T)
Carrying out average treatment on the steam specific volumes respectively obtained by the thermodynamic parameters of the outlet of the boiler steam pipeline and the thermodynamic parameters of the inlet of the steam turbine steam pipeline to obtain the average specific volume of the steam in the pipeline;
vms＝0.5(f(pb，ms，Tb，ms)+f(pt，ms，Tt，ms)
vrh，i＝0.5(f(pb，rh，i，Tb，rh，i)+f(pt，rh，i，Tt，rh，i)
Figure BDA0002783541490000081
Figure BDA0002783541490000082
vmsaverage steam specific volume, m, of the main steam line3/kg；
vrh，i-average steam specific volume, m, of i reheat steam lines3/kg；
VmsVolume flow of the main steam line, m3/s；
Vrh，i-volume flow of i reheat steam lines, m3/s；
Wherein the main steam volume flow V is calculatedmsMass flow F usedb，msDetermining according to a field measuring point; calculating the volume flow V of each reheated steamrh，iMass flow F usedb，rh，iThe heat balance is calculated by a field measuring point or a steam turbine air extraction heat balance method;
(3) according to the pipe diameter D of the main steam pipelinemsAnd the pipe diameter D of each reheating steam pipelinerh，iThe flow rate of steam in the pipe is calculated according to the following formula:
Figure BDA0002783541490000083
Figure BDA0002783541490000091
Dmsthe inner diameter of the main steam line, m;
Drh，i-the inner diameter of the i reheat steam lines, m;
ums-the steam flow rate of the main steam line, m/s;
urh，i-steam flow rate of i reheat steam lines, m/s;
(4) calculating the flow time of each steam in the pipeline from the boiler outlet to the steam turbine inlet section as follows:
Figure BDA0002783541490000092
Figure BDA0002783541490000093
Δtms-the flow time, s, of the main steam from the boiler tube outlet to the steam turbine main port inlet;
Δtrh，i-the flow time, s, of i reheat steam from boiler tube outlet to inlet of the turbine reheat valve;
step three: establishing a real-time calculation formula of the pipeline efficiency of the power plant under the consideration of the time dimension: according to the current t0Calculating t according to steam thermodynamic parameters of the pipeline entering the steam turbine at the moment0Main steam enthalpy and reheat steam enthalpy at the steam turbine inlet at the moment; calculating t according to steam thermodynamic parameters of the boiler steam outlet at the time of forward deviation of steam flow time delta t to enter the pipeline0-main steam enthalpy and reheat steam enthalpy at the boiler outlet at time Δ t; based on the above results, t is calculated0Instantaneous pipeline real-time efficiency etap(t0) The detailed formula is as follows:
h1，ms(t0)＝G(pt，ms(t0)，Tt，ms(t0))
h2，ms(t0-Δtms)＝G(pb，ms(t0-Δtms)，Tb，ms(t0-Δtms))
h1，rh，i(t0)＝G(pt，rh，i(t0)，Tt，rh，i(t0))
h2，rh，i(t0-Δtrh，i)＝G(pb，rh，i(t0-Δtrh，i)，Tb，rh，i(t0-Δtrh，i))
Figure BDA0002783541490000101
h1，ms(t0)——t0the enthalpy of main steam at the inlet pipeline of the steam turbine at the moment is kJ/kg;
h2，ms(t0-Δtms)——t0-Δtmsthe enthalpy of main steam at the outlet pipeline of the boiler is kJ/kg at the moment;
h1，rh，i(t0)——t0enthalpy of i times of reheat steam at an inlet pipeline of the steam turbine at the moment, kJ/kg;
h2，rh，i(t0-Δtrh，i)——t0-Δtrh，ienthalpy of i times of reheat steam at a boiler outlet pipeline at the moment, kJ/kg;
ηp(t0)——t0power plant pipeline efficiency,%;
g, calculating or looking up a table according to the steam pressure and the temperature to obtain a function corresponding to the enthalpy value;
pt，ms(t0)，Tt，ms(t0)——t0the main steam pressure, MPa, and main steam temperature, DEG C, at the steam turbine inlet at the moment;
pt，rh，i(t0)，Tt，rh，i(t0)——t0i times of reheating at steam turbine inlet at momentSteam pressure, MPa, and i reheat steam temperature, deg.C;
pb，ms(t0-Δtms)，Tb，ms(t0-Δtms)——t0-Δtmsthe main steam pressure, MPa, and main steam temperature, DEG C, at the boiler outlet at the moment;
pb，rh，i(t0-Δtrh，i)，Tb，rh，i(t0-Δtrh，i)——t0-Δtrh，ithe pressure of i reheat steam at the boiler outlet at the moment is MPa, and the temperature of the i reheat steam is in DEG C.

Claims (5)

1. A method for calculating the pipeline efficiency of a power plant on line based on real-time data is characterized by comprising the following steps:
the method comprises the following steps: based on a power plant real-time production data monitoring platform, selecting steam thermodynamic real-time monitoring parameters of an outlet of a main steam pipeline of a boiler:
step two: calculating the flow time of steam in the pipeline, and determining the time corresponding to each parameter for calculating the pipeline efficiency in real time;
step three: establishing a real-time calculation formula of the pipeline efficiency of the power plant under the consideration of the time dimension: according to the current t0Calculating t according to steam thermodynamic parameters of the pipeline entering the steam turbine at the moment0Main steam enthalpy and reheat steam enthalpy at the steam turbine inlet at the moment; calculating t according to steam thermodynamic parameters of the boiler steam outlet at the time of forward deviation of steam flow time delta t to enter the pipeline0-main steam enthalpy and reheat steam enthalpy at the boiler outlet at time Δ t; based on the above results, t is calculated0Instantaneous pipeline real-time efficiency etap(t0)。
2. The method for calculating the efficiency of the pipeline of the power plant on the basis of the real-time data as claimed in claim 1, wherein the steam thermodynamics real-time monitoring parameters in the step one specifically comprises:
main steam pressure pb，msMain steam temperature Tb，msMain steam flow F of boilerb，ms(ii) a Selecting steam thermodynamic real-time monitoring parameters of a steam turbine main valve inlet: main steam pressure pt，msMain steam temperature Tt，msMain steam flow F of steam turbinet，ms；
Selecting real-time monitoring parameters of steam thermodynamics at outlets of all boiler reheating steam pipelines according to the actual reheating times i, i of the thermodynamic system of the power plant, wherein i is 1 or 2: reheat steam pressure pb，rh，iTemperature T of reheat steamb，rh，iBoiler reheat steam flow rate Fb，rh，i(ii) a Selecting steam thermodynamic real-time monitoring parameters of all steam turbine reheating valve inlets: reheat steam pressure pt，rh，iTemperature T of reheat steamt，rh，iFlow rate of reheat steam F of steam turbinet，rh，i；
The unit of the above parameters is: the pressure unit is MPa, the temperature unit is DEG, and the flow unit is t/h.
3. The method for calculating the pipeline efficiency of the power plant on the line based on the real-time data as claimed in claim 1, wherein the time corresponding to each parameter used for calculating the pipeline efficiency in real time in the second step is determined as follows:
(1) obtaining the total length L of the pipeline from the main steam outlet of the boiler to the main steam inlet of the steam turbine according to the site pipeline layout drawing and the design informationmsThe unit m; total length L of pipeline from each reheat steam outlet of boiler to corresponding reheat steam inlet of steam turbinerh，iThe unit m, i is 1 or 2, and is consistent with the actual reheating time i of the step one;
(2) calculating the volume flow of the steam in the pipeline;
according to thermodynamic parameters state pressure and temperature, looking up a table or an approximate formula, calculating to obtain steam specific volume v, m3/kg；
v＝f(p，T)
Carrying out average treatment on the steam specific volumes respectively obtained by the thermodynamic parameters of the outlet of the boiler steam pipeline and the thermodynamic parameters of the inlet of the steam turbine steam pipeline to obtain the average specific volume of the steam in the pipeline;
vms＝0.5(f(pb，ms，Tb，ms)+f(pt，ms，Tt，ms)
vrh，i＝0.5(f(pb，rh，i，Tb，rh，i)+f(pt，rh，i，Tt，rh，i)
Figure FDA0002783541480000021
Figure FDA0002783541480000022
vmsaverage steam specific volume, m, of the main steam line3/kg；
vrh，i-average steam specific volume, m, of i reheat steam lines3/kg；
VmsVolume flow of the main steam line, m3/s；
Vrh，i-volume flow of i reheat steam lines, m3/s；
Wherein the main steam volume flow V is calculatedmsMass flow F usedb，msDetermining according to a field measuring point; calculating the volume flow V of each reheated steamrh，iMass flow F usedb，rh，iThe heat balance is calculated by a field measuring point or a steam turbine air extraction heat balance method;
(3) according to the pipe diameter D of the main steam pipelinemsAnd the pipe diameter D of each reheating steam pipelinerh，iThe flow rate of steam in the pipe is calculated according to the following formula:
Figure FDA0002783541480000031
Figure FDA0002783541480000032
Dmsthe inner diameter of the main steam line, m;
Drh，i-the inner diameter of the i reheat steam lines, m;
ums-the steam flow rate of the main steam line, m/s;
urh，i-steam flow rate of i reheat steam lines, m/s;
(4) calculating the flow time of each steam in the pipeline from the boiler outlet to the steam turbine inlet section as follows:
Figure FDA0002783541480000033
Figure FDA0002783541480000034
Δtms-the flow time, s, of the main steam from the boiler tube outlet to the steam turbine main port inlet;
Δtrh，i-the flow time, s, of i reheat steam from boiler tube outlet to inlet of the steam turbine reheat valve.
4. The method for calculating the efficiency of the pipeline of the power plant on line based on the real-time data as claimed in claim 1, wherein t is the third step0Instantaneous pipeline real-time efficiency etap(t0) (ii) a The detailed formula is as follows:
h1，ms(t0)＝G(pt，ms(t0)，Tt，ms(t0))
h2，ms(t0-Δtms)＝G(pb，ms(t0-Δtms)，Tb，ms(t0-Δtms))
h1，rh，i(t0)＝G(pt，rh，i(t0)，Tt，rh，i(t0))
h2，rh，i(t0-Δtrh，i)＝G(pb，rh，i(t0-Δtrh，i)，Tb，rh，i(t0-Δtrh，i))
Figure FDA0002783541480000041
h1，ms(t0)——t0the enthalpy of main steam at the inlet pipeline of the steam turbine at the moment is kJ/kg;
h2，ms(t0-Δtms)——t0-Δtmsthe enthalpy of main steam at the outlet pipeline of the boiler is kJ/kg at the moment;
h1，rh，i(t0)——t0enthalpy of i times of reheat steam at an inlet pipeline of the steam turbine at the moment, kJ/kg;
h2，rh，i(t0-Δtrh，i)——t0-Δtrh，ienthalpy of i times of reheat steam at a boiler outlet pipeline at the moment, kJ/kg;
ηp(t0)——t0power plant pipeline efficiency,%;
g, calculating or looking up a table according to the steam pressure and the temperature to obtain a function corresponding to the enthalpy value;
pt，ms(t0)，Tt，ms(t0)——t0the main steam pressure, MPa, and main steam temperature, DEG C, at the steam turbine inlet at the moment;
pt，rh，i(t0)，Tt，rh，i(t0)——t0at the moment, the pressure of i times of reheat steam at the inlet of the steam turbine is MPa, and the temperature of i times of reheat steam is in DEG C;
pb，ms(t0-Δtms)，Tb，ms(t0-Δtms)——t0-Δtmsthe main steam pressure, MPa, and main steam temperature, DEG C, at the boiler outlet at the moment;
pb，rh，i(t0-Δtrh，i)，Tb，rh，i(t0-Δtrh，i)——t0-Δtrh，ithe pressure of i reheat steam at the boiler outlet at the moment is MPa, and the temperature of the i reheat steam is in DEG C.
5. The method for calculating the efficiency of the pipeline of the power plant on the basis of the real-time data as claimed in claim 1, wherein t is calculated0At any moment when pipeline efficiency is high, t needs to be called from a real-time database0-ΔtmsTime and t0-Δtrh，iThe real-time parameters of the time are the compressibility of the database and the frequency of data acquisition, and if the time of the database has no specific numerical value, the scheme is a forward interpolation method, namely the latest historical value stored in the database before the time is selected.
CN202011290128.8A 2020-11-18 2020-11-18 Method for calculating pipeline efficiency of power plant on line based on real-time data Pending CN112395817A (en)

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