CN111027186A - Performance diagnosis method and system for moisture separator reheater in running state - Google Patents
Performance diagnosis method and system for moisture separator reheater in running state Download PDFInfo
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Abstract
The disclosure provides a performance diagnosis method and a system under the running state of a moisture separator reheater, which are used for establishing an equivalent thermal drop performance model of the moisture separator reheater: determining a performance parameter threshold of the moisture separator reheater, and determining a final steam extraction efficiency calculation formula of the moisture separator reheater based on the steam extraction equivalent enthalpy drop of the secondary heater and the steam extraction equivalent enthalpy drop of the primary heater; obtaining operation state parameters of a moisture separator reheater in real time, judging the validity of the parameters through a threshold value, judging that a measuring point outside the threshold value range is a dead point, eliminating the dead point, and inputting a residual effective value serving as a model input item into an equivalent thermal drop performance model in real time to obtain the steam extraction efficiency of the moisture separator reheater; the steam extraction efficiency of the steam-water separation reheater is based on the steam extraction flow rate of the steam-water separation reheater, and the electric load power of the steam-water separation reheater is improved. Based on the running state of the moisture separator reheater, the extraction steam flow is adjusted, and the electrical load power of the moisture separator reheater is improved.
Description
Technical Field
The disclosure relates to the technical field of operation state diagnosis, in particular to a method and a system for diagnosing performance of a moisture separator reheater in an operation state.
Background
A steam-water separator reheater (MSR) is an important device of a nuclear power plant, and as shown in fig. 2, has the main functions of separating moisture from high-humidity-discharge steam and reheating the separated steam, and two-stage reheating is generally adopted. After a certain nuclear power station is put into operation, the steam extraction flow of the steam-water separator reheater is adjusted, the electric load is increased from 720MW to 728MW, the running state of the nuclear power station can be diagnosed, the steam extraction flow of the nuclear power station is adjusted, and the economic efficiency of a unit is greatly influenced.
The research of the steam-water separator is most common in the field of equipment design and the field of operational reliability. In the field of equipment design, the design of a steam-water separator body is focused on, and the purposes of improving the separation efficiency, enhancing the heat transfer effect and prolonging the service life are achieved by reasonable design on the equipment hardware level; in the field of operational reliability, the analysis of the safety and reliability of the equipment in the operational process is focused.
Based on the running state of the moisture separator reheater, the extraction steam flow of the moisture separator reheater is adjusted, and the running economy of the moisture separator reheater is improved.
Disclosure of Invention
The purpose of the embodiments of the present specification is to provide a method for diagnosing performance of a moisture separator reheater in an operating state, in which the quality of steam extracted by the moisture separator is obtained through calculation of steam extraction efficiency of the moisture separator, so as to measure the performance of the moisture separator reheater, and various indicators of the moisture separator reheater can be visually observed through real-time calculation, and the influence of the indicators on the operation of a unit is analyzed, so as to achieve the purposes of improving the performance of the moisture separator reheater and increasing the output of the unit.
The embodiment of the specification provides a performance diagnosis method in a steam-water separator reheater operation state, which is realized by the following technical scheme:
the method comprises the following steps:
establishing an equivalent thermal drop performance model of a moisture separator reheater: determining a performance parameter threshold of the moisture separator reheater, and determining a final steam extraction efficiency calculation formula of the moisture separator reheater based on the steam extraction equivalent enthalpy drop of the secondary heater and the steam extraction equivalent enthalpy drop of the primary heater;
obtaining operation state parameters of a moisture separator reheater in real time, judging the validity of the parameters through a threshold value, judging that a measuring point outside the threshold value range is a dead point, eliminating the dead point, and inputting a residual effective value serving as a model input item into an equivalent thermal drop performance model in real time to obtain the steam extraction efficiency of the moisture separator reheater;
the steam extraction efficiency of the steam-water separation reheater is based on the steam extraction flow rate of the steam-water separation reheater, and the electric load power of the steam-water separation reheater is improved.
According to the further technical scheme, after an equivalent thermal drop performance model of the moisture separator reheater is established, performance parameters and threshold values of the moisture separator reheater are marked on a display graphical moisture separator reheater, after a calculation result is obtained, the calculation result is displayed on a display interface based on the moisture separator reheater, and meanwhile deviation of the parameters is displayed.
In a further technical scheme, the inlet and outlet temperature, pressure, dryness, enthalpy and flow of the steam-water separator are respectively arranged into polynomials about electric power by utilizing a PLOT function and are used as threshold values of all parameters.
According to a further technical scheme, the parameters of the steam-water separator comprise: the system comprises a unit electrical load, a stack power, a steam turbine heat rate, a steam turbine steam rate, a main steam temperature, a main steam pressure, a main steam flow, a main steam enthalpy, a high-pressure cylinder steam inlet pressure, a high-pressure cylinder steam inlet enthalpy, a high-pressure cylinder steam inlet flow, a high-pressure cylinder steam exhaust pressure, a high-pressure cylinder steam exhaust temperature, a high-pressure cylinder steam exhaust flow, a preseparator drainage temperature, a preseparator drainage pressure, a preseparator drainage flow, a preseparator drainage enthalpy, a primary reheat steam temperature, a primary reheat steam pressure, a primary reheat steam flow, a primary reheat drainage enthalpy, a primary reheat cold steam flow, a primary reheat cold steam enthalpy, a secondary reheat steam temperature and the like.
According to a further technical scheme, the equivalent thermal drop performance model of the moisture separator reheater comprises the following steps:
standard one kilogram of live steam in the main steam line, the amount that is drawn back at the primary heater:
Bch＝Dhrq1/(h1-cq1*Jcq1-cs1*Jcs1)
bch: standard one kilogram quantity of new steam to be drawn back in the primary heater
h1, primary reheater extraction enthalpy;
dhrq1 where enthalpy of exhaust steam in the primary reheater increases;
cq1, the steam dredging coefficient of the first-stage reheating steam extraction;
jcq 1: the vapor purging enthalpy of the primary reheater;
cs1, the hydrophobic coefficient of the first-stage reheating steam extraction;
jcs 1: the hydrophobic enthalpy of the primary reheater.
In order to achieve the constant outlet temperature of the primary heater, a part of the steam needs to be pumped away to heat the rest part of the steam because one kilogram of new steam is added;
then assume Awch1 is not drawn, Ach1 is drawn
Then for one kilogram of steam:
Awch1+Ach1＝1；
Awch1*Bch＝Ach1；
to obtain:
Awch1＝1/(1+Bch)；
Ach1＝1-Awch1。
the further technical proposal is that the steam extraction equivalent enthalpy drop of the secondary heater and the steam extraction efficiency are
N2＝H/(H2-H2s)
Wherein, H2 s: the average enthalpy of the hydrophobic mixture.
The further technical proposal is that the steam extraction equivalent enthalpy drop of the primary heater and the steam extraction efficiency are
N1＝H/(h1-H1s)
Wherein, H1 s: the average enthalpy of the hydrophobic mixture.
The embodiment of the specification provides a performance diagnosis method in a steam-water separator reheater operation state, which is realized by the following technical scheme:
the method comprises the following steps:
a model building module configured to: establishing an equivalent thermal drop performance model of a moisture separator reheater: determining a performance parameter threshold of the moisture separator reheater, and determining a final steam extraction efficiency calculation formula of the moisture separator reheater based on the steam extraction equivalent enthalpy drop of the secondary heater and the steam extraction equivalent enthalpy drop of the primary heater;
a moisture separator reheater extraction efficiency calculation module configured to: obtaining operation state parameters of a moisture separator reheater in real time, judging the validity of the parameters through a threshold value, judging that a measuring point outside the threshold value range is a dead point, eliminating the dead point, and inputting a residual effective value serving as a model input item into an equivalent thermal drop performance model in real time to obtain the steam extraction efficiency of the moisture separator reheater;
an adjustment module configured to: the steam extraction efficiency of the steam-water separation reheater is based on the steam extraction flow rate of the steam-water separation reheater, and the electric load power of the steam-water separation reheater is improved.
The embodiment of the specification provides a computer device which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of the performance diagnosis method in the running state of the steam-water separation reheater.
The present specification provides a computer readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the steps of the method for diagnosing performance in a moisture separator reheater operating state.
Compared with the prior art, the beneficial effect of this disclosure is:
according to the invention, the result is calculated in real time, and the running state parameters are displayed in real time, so that compared with the existing performance analysis before and after overhaul, the timeliness is improved, and engineers can conveniently master the performance condition of the equipment in time.
The method adopts graphical display, is more visual than a performance diagnosis report, and has an obvious data visualization effect.
The method is based on the operation state of the moisture separator reheater, and based on the calculated steam extraction efficiency (the heat required to be added for exhausting 1kg of steam extraction is qj, the work obtained by exhausting 1kg of steam extraction is Hj, the ratio of Hj to qj becomes the steam extraction efficiency, the parameter represents the change rate of power in a unit caused by steam extraction change) and the enthalpy rise of a medium, the steam extraction flow of the moisture separator reheater is adjusted, and the operation effectiveness and the economy of the moisture separator reheater are improved.
The steam extraction efficiency is the power change rate in the unit caused by the steam extraction change, the medium temperature rise is the temperature change of fluid in the pipe, the performance of the heater is represented, and the steam extraction amount is adjusted according to the steam extraction efficiency and the medium enthalpy rise.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a flow chart of an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of a moisture separator reheater in accordance with an exemplary embodiment of the present disclosure;
fig. 3 is a monitoring screen diagram of an embodiment of the present disclosure.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example of implementation 1
The embodiment discloses a performance diagnosis method for a steam-water separator reheater in an operating state, the performance of the steam-water separator reheater is measured by calculating the steam extraction efficiency (the heat required to be added for extracting 1kg of steam is qj, the work obtained by extracting 1kg of steam is Hj, and the ratio of Hj to qj becomes the steam extraction efficiency) of the steam-water separator and the enthalpy rise of a medium, so that the quality of the steam extracted by the steam-water separator and the power change rate in a unit caused by the change of the steam extraction are obtained, and the heat exchange coefficient and the dirt thermal resistance of a heat exchanger are calculated in combination. Basic relevant indexes (main unit electrical load, stack power, steam turbine heat consumption rate, steam turbine steam consumption rate, main steam temperature, main steam pressure, main steam flow, main steam enthalpy, high-pressure cylinder steam inlet pressure, high-pressure cylinder steam inlet enthalpy, high-pressure cylinder steam inlet flow, high-pressure cylinder steam exhaust pressure, high-pressure cylinder steam exhaust temperature, high-pressure cylinder steam exhaust flow, pre-separator drainage temperature, pre-separator drainage pressure, pre-separator drainage flow, pre-separator drainage enthalpy, primary reheat steam temperature, primary reheat steam pressure, primary reheat steam flow, primary reheat drainage flow, primary reheat steam enthalpy, primary reheat cold steam flow, primary reheat cold steam enthalpy and secondary reheat steam temperature, are usually obtained by time weighted averaging after taking numbers through a real-time database.) of the steam-water separator reheater can be intuitively seen through real-time calculation, and the steam extraction efficiency can be obtained according to the equivalent heat drop performance model in the text. The influence of the change of the steam extraction efficiency on the economic performance of the unit is judged by analyzing the change of the steam extraction efficiency, and the steam extraction flow is adjusted to be proper so as to achieve the purposes of improving the performance of the steam-water separator reheater and increasing the output of the unit.
The steam extraction efficiency is the power change rate in the unit caused by steam extraction change.
Referring to fig. 1, the method for establishing the equivalent thermal drop performance model comprises the following steps:
the method comprises the following steps: and determining a basic index and a threshold value. The recommended base index is shown in table 1. According to the data of the steam-water separation reheater manufacturer during delivery, the data mainly comprise a steam turbine characteristic specification and an equipment specification. According to the inlet and outlet temperature, pressure, dryness, enthalpy and flow of the steam-water separator in the material, the PLOT function of matlab is respectively arranged into polynomial equations related to electric power (or other parameters) to be used as the threshold value of each parameter. The specific method is to arrange parameters in a steam turbine characteristic specification and an equipment specification, such as the primary reheat steam flow rate, so that the parameters are respectively 178.4, 170.5, 145.13, 121.2, 110.22, 78.36 and 59.41 under the condition that the electric power is 705349, 650404, 616037, 544174, 507998, 399039 and 323945kW, and a polynomial of the steam flow rate relative to the electric power can be fitted according to a PLOT function of matlab. And then, taking the difference between the result of the polynomial value and the average value in the historical normal operation data under the corresponding working condition as a floating interval, and taking the confidence coefficient of 97% in the interval as the basis for finally judging the data validity according to the 3 sigma principle. Culling that offsets outside the confidence interval, time-weighted averaging within the interval.
TABLE 1
The model calculation method is as follows: based on an equivalent enthalpy drop and heat balance calculation method, data which can be input into a model is obtained after data in the table I are judged according to a threshold value, and then the enthalpy value (obtained by calculation of an ACS calculation engine of a Lunen software company used in the invention) is obtained by pressure temperature and design dryness of each position (inlet and outlet steam, steam extraction and drainage). Followed by the following steps
According to the theory of equivalent enthalpy drop, assuming a standard kilogram of fresh steam, the amount that is drawn back at the primary heater is:
Bch＝Dhrq1/(h1-cq1*Jcq1-cs1*Jcs1)；
wherein: bch: one kilogram of new steam is pumped back in the primary heater; h1, primary reheater extraction enthalpy; dhrq1 where enthalpy of exhaust steam in the primary reheater increases; cq1, the steam dredging coefficient of the first-stage reheating steam extraction; jcq 1: the vapor purging enthalpy of the primary reheater; cs1, the hydrophobic coefficient of the first-stage reheating steam extraction; jcs 1: the hydrophobic enthalpy of the primary reheater.
To achieve a constant primary heater outlet temperature, a portion of the purge is required to heat the remaining portion of the steam as one kilogram of fresh steam is added.
Ach1 assumes Awch1 is the amount of non-pumped and Ach1 is the amount of pumped
Then for one kilogram of steam:
Awch1+Ach1＝1；
Awch1*Bch＝Ach1；
from the above 2 equations, it can be derived:
Awch1＝1/(1+Bch)；
Ach1＝1-Awch1；
to achieve a constant primary heater outlet temperature, a portion of the purge is required to heat the remaining portion of the steam as one kilogram of fresh steam is added.
One kilogram of fresh steam, as assumed above, is drawn back in the secondary heater in the amount of
One kilogram of extraction steam entering the secondary heater requires the extraction of the main steam:
C＝Dhrq2/(H2-cq2*Jcq2-cs2*Jcs2)；
wherein: dhrq2 where enthalpy of exhaust steam in the secondary reheater increases; h2 extraction enthalpy of the two-stage reheating; cq2 steam thinning coefficient of the two-stage reheating steam extraction; jcq 2: the vapor purging enthalpy of the secondary reheater; cs2, the hydrophobic coefficient of the secondary reheat extraction steam; jcs 2: the hydrophobic enthalpy of the secondary reheater.
To achieve a constant secondary heater outlet temperature, a portion of the purge is required to heat the remaining portion of the steam as one kilogram of fresh steam is added.
One kilogram of new steam is pumped out of the primary heater by the amount of Ach1, and then enters the secondary heater by the amount of 1-Ach 1;
then assume Awch2 is not withdrawn and Ach2 is withdrawn
Then for one kilogram of steam:
Awch2+Ach2＝1-Ach1；
Awch2*C＝Ach2；
from the above 2 equations, it can be derived:
Awch2＝(1-Ach1)/(1+C)；
Ach2＝1-Awch2；
one kilogram of first heater steam (water) mixture benefits the 1 # gaka for Hslh1 calculation for later calculations, where 1kg is one unit of media, unlike the previous assumptions.
If 1kg of hydrophobic soda mixture has a hydrophobic content of cs1, the corresponding enthalpy is Jcs1, the hydrophobic proportion of cq1 and the corresponding enthalpy is Jcq1
The steam is dredged and the work is done less
DHcq1＝cq1*[(Jcq1-Jc1)*n1+Jc1-h0]
Wherein: jc 1: first-stage reheat extraction enthalpy; jcq 1: a first-stage reheater is used for steam drainage; h0 low enthalpy of discharge.
Dewatering and little work:
DHcs1＝cs1*[(Jcs1-Js1)*n2+(Js1-Js2)*n2+(Js2-Ji3)*n3+(Jo4-Jo5)*n4+(Jo5-Jo6)*n5+(Jo6-Jo7)*n6+(Jo7-Ji7)*n7]
wherein: js 1-Js 7, which represent the hydrophobic enthalpy of the condensed water or feedwater heater; N1-N7, representing the steam extraction efficiency of each heater; jo 3-Jo 7: representing the enthalpy of the condensed water at the outlet of each heater; ji 3-Ji 7: representing individual heater inlet condensate enthalpy; the first-stage heater steam (water) dredging mixture is favorable for the No. 1 high-pressure addition:
Hslh1＝DHcq1+DHcs1；
one kilogram of the secondary heater steam (water) mixture benefits the number 2 gaka, calculated Hslh2, for later calculations.
If 1kg of hydrophobic soda mixture has a hydrophobic content of cs2, the corresponding enthalpy is Jcs2, the hydrophobic proportion of cq2 and the corresponding enthalpy is Jcq2
The steam is dredged and the work is done less
DHcq2＝cq2*[(Jcq2-Jc1)*n1+Jc1-h0]
Dewatering and little work:
DHcs2＝cs2*[(Jcs2-Js1)*n2+(Js1-Js2)*n2+(Js2-Ji3)*n3+(Jo4-Jo5)*n4+(Jo5-Jo6)*n5+(Jo6-Jo7)*n6+(Jo7-Ji7)*n7]
the first-stage heater steam (water) dredging mixture is favorable for the No. 1 high-pressure addition:
Hslh2＝DHcq2+DHcs2；
wherein: js 1-Js 7, which represent the hydrophobic enthalpy of the condensed water or feedwater heater; N1-N7, representing the steam extraction efficiency of each heater; jo 3-Jo 7: representing the enthalpy of the condensed water at the outlet of each heater; ji 3-Ji 7: indicating enthalpy of condensate at inlet of each heater
The part has less work
DHjrq＝(DHcq+DHcs)
This portion of the extraction, whether it is withdrawn or not, will be substantially withdrawn, and will not enter the heater, since Ach will be very small and therefore may be disregarded.
The extraction equivalent enthalpy drop of the secondary heater and the results of the previous calculations are for this portion of use.
One kilogram of main steam is pumped out, the main steam is flushed out from the primary heater by the Ach1, and the main steam is pumped out from the secondary heater by the Ach 2.
Part of the extraction steam is drawn back at the first-stage extraction steam position
The influence of this part on the primary heater is
HAch1＝Ach1*Hslh1
Do more work in high-pressure cylinder
HAchz1＝Ach1*(Hz-h1)
Withdrawing part of the heat from the secondary reheater:
the impact this portion has on the primary heater is:
HAch2＝Ach2*Hslh2
this portion of the extracted steam does not work in the high pressure cylinder.
The third part is used for extracting steam from the main steam of the high-pressure cylinder to the final steam exhaust
Hwch＝(1-Ach2-Ach1)*(Hz+Dhrq1+Dhrq2-h0)
h0 is exhaust enthalpy
Finally, one kilogram of steam extraction is extruded, and the work is:
H＝HAch1+HAchz1+HAch2+Hwch；
the final extraction efficiency is
N2＝H/(H2-H2s)
H2 s: average enthalpy of hydrophobic mixture, final overall calculation result N1.N1 includes N2
Extraction equivalent enthalpy drop of primary heater
Less than one kilogram of extraction steam is extracted, and a part of extraction steam Ach1 is extracted from the primary heater
The extraction amount of part of the extracted steam is Ach 1; the steam withdrawn from the part can do more work
DHCH1＝Ach1*(h1-Hgp)
Wherein: hgp, high enthalpy of discharge.
The influence of this part on the primary heater is
HAch1＝Ach1*Hslh1
In order to meet the requirement of the outlet of the secondary heater, more steam is required to be extracted from the main steam, so that more work is done
Hch2n＝(1-Ach1)*Dhrq2*N2
Dhrq2: the heating enthalpy of the secondary heater to the cold end steam is increased; n2: indicating the extraction efficiency of the secondary heater
The part which is not pumped back can smoothly flow to the condenser and do more work
Hwch＝(1-Ach1)*(h1+Dhrq1+Dhrq2-h0)
Wherein: h1 is the extraction enthalpy of the primary heater; h0 is the exhaust enthalpy.
Finally, one kilogram of steam extraction is extruded, and the work is:
H＝DHCH1+HAch1-Hch2n+Hwch
the final steam extraction efficiency is N1 ═ H/(H1-H1s)
Wherein: h: finally, one kilogram of steam extraction is extruded to bring work; h1, primary reheater extraction enthalpy; h1 s: the enthalpy of the average hydrophobic mixture;
step two: calling basic measuring points (see table 1 in detail) required by analysis by using a real-time database scheduling tool according to a set frequency, after configuring a threshold value in the scheduling tool, carrying out threshold value judgment validity on measuring point data by using the tool (judging that the measuring points outside a threshold value range are dead points), removing the dead points, and inputting the residual effective values into a calculation model in real time as model input items; and writing a steam-water separator economic diagnosis performance model based on equivalent heat drop in an MATLAB, receiving data of a scheduling tool by the MATLAB for calculation, and outputting the calculation result back to a real-time database (the intermediate variables and the result calculated in the step one at least need to output a final steam extraction efficiency N1).
Step three: economic monitoring diagnosis picture: the economy monitoring diagnosis screen was drawn using PI-PROCESSSOOK of OSI corporation.
Referring to a DCS side picture and a picture in the KIT system, and combining a thermodynamic system diagram, drawing a monitoring and diagnosis picture of the moisture separator reheater, as shown in FIG. 3.
And marking the performance parameters and the threshold values of the moisture separator reheaters at corresponding positions according to the threshold values.
And (5) index analysis. And comparing the result (mainly the steam extraction efficiency) obtained by calculation with a threshold under the design working condition, and displaying the deviation and the influence of the deviation on the economy.
The steam extraction efficiency index deviation analysis can configure the real-time database basic measuring points related to the performance parameters on the picture, and when the deviation occurs, the difference between the basic measuring point value related to the performance parameters and the design threshold value is displayed at the coincident point, so that an engineer can conveniently and quickly locate the reason of the steam extraction efficiency deviation, the operation is improved conveniently (for example, if the steam extraction flow has larger deviation, the steam extraction efficiency deviation caused by the reason of the steam extraction flow can be judged, the engineer can adjust the steam extraction flow to ensure the best steam extraction efficiency), and the economical efficiency is improved.
It is to be understood that throughout the description of the present specification, reference to the term "one embodiment", "another embodiment", "other embodiments", or "first through nth embodiments", etc., is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or materials described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (9)
1. The method for diagnosing the performance of the moisture separator reheater in the operating state is characterized by comprising the following steps of:
establishing an equivalent thermal drop performance model of a moisture separator reheater: determining a performance parameter threshold of the moisture separator reheater, and determining a final steam extraction efficiency calculation formula of the moisture separator reheater based on the steam extraction equivalent enthalpy drop of the secondary heater and the steam extraction equivalent enthalpy drop of the primary heater;
obtaining operation state parameters of a moisture separator reheater in real time, judging the validity of the parameters through a threshold value, judging that a measuring point outside the threshold value range is a dead point, eliminating the dead point, and inputting a residual effective value serving as a model input item into an equivalent thermal drop performance model in real time to obtain the steam extraction efficiency of the moisture separator reheater;
the steam extraction efficiency of the steam-water separation reheater is based on the steam extraction flow rate of the steam-water separation reheater, and the electric load power of the steam-water separation reheater is improved.
2. The method for diagnosing the performance of the moisture separator reheater in the operating state of the moisture separator reheater, according to claim 1, wherein after the equivalent thermal drop performance model of the moisture separator reheater is established, the performance parameters and the threshold values of the moisture separator reheater are marked on the displayed graphical moisture separator reheater, and after the calculation result is obtained, the calculation result is displayed on a display interface based on the moisture separator reheater, and meanwhile, the deviation of the parameters is displayed.
3. The method of claim 1, wherein the steam-water separator reheater operating condition is characterized in that the inlet and outlet temperatures, pressures, dryness, enthalpy and flow rates of the steam-water separator are respectively arranged into polynomials with respect to electric power by using a PLOT function, and the polynomials are used as the threshold values of the parameters.
4. The method of claim 1, wherein the steam-water separator parameters include: the system comprises a unit electrical load, a stack power, a steam turbine heat rate, a steam turbine steam rate, a main steam temperature, a main steam pressure, a main steam flow, a main steam enthalpy, a high-pressure cylinder steam inlet pressure, a high-pressure cylinder steam inlet enthalpy, a high-pressure cylinder steam inlet flow, a high-pressure cylinder steam exhaust pressure, a high-pressure cylinder steam exhaust temperature, a high-pressure cylinder steam exhaust flow, a preseparator drainage temperature, a preseparator drainage pressure, a preseparator drainage flow, a preseparator drainage enthalpy, a primary reheat steam temperature, a primary reheat steam pressure, a primary reheat steam flow, a primary reheat drainage enthalpy, a primary reheat cold steam flow, a primary reheat cold steam enthalpy, a secondary reheat steam temperature and the like.
5. The method of claim 1, wherein the secondary heater has an equivalent enthalpy drop for steam extraction and an extraction efficiency of
N2＝H/(H2-H2s)
Wherein, H2 s: the average enthalpy of the hydrophobic mixture.
6. The method of claim 1, wherein the primary heater has an equivalent enthalpy drop for steam extraction and an extraction efficiency of
N1＝H/(h1-H1s)
Wherein, H1 s: the average enthalpy of the hydrophobic mixture.
7. The method for diagnosing the performance of the moisture separator reheater in the operating state is characterized by comprising the following steps of:
a model building module configured to: establishing an equivalent thermal drop performance model of a moisture separator reheater: determining a performance parameter threshold of the moisture separator reheater, and determining a final steam extraction efficiency calculation formula of the moisture separator reheater based on the steam extraction equivalent enthalpy drop of the secondary heater and the steam extraction equivalent enthalpy drop of the primary heater;
a moisture separator reheater extraction efficiency calculation module configured to: obtaining operation state parameters of a moisture separator reheater in real time, judging the validity of the parameters through a threshold value, judging that a measuring point outside the threshold value range is a dead point, eliminating the dead point, and inputting a residual effective value serving as a model input item into an equivalent thermal drop performance model in real time to obtain the steam extraction efficiency of the moisture separator reheater;
an adjustment module configured to: the steam extraction efficiency of the steam-water separation reheater is based on the steam extraction flow rate of the steam-water separation reheater, and the electric load power of the steam-water separation reheater is improved.
8. A computer apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to perform the steps of the method for performance diagnosis in a steam-water separator reheater operating condition.
9. A computer-readable storage medium, having a computer program stored thereon, wherein the program, when executed by a processor, performs the steps of a method for diagnosing performance in a moisture separator reheater operating condition.
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