CN115355064A - Historical data analysis-based performance judgment method for TCA cooler of combustion engine - Google Patents

Historical data analysis-based performance judgment method for TCA cooler of combustion engine Download PDF

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Publication number
CN115355064A
CN115355064A CN202210774718.0A CN202210774718A CN115355064A CN 115355064 A CN115355064 A CN 115355064A CN 202210774718 A CN202210774718 A CN 202210774718A CN 115355064 A CN115355064 A CN 115355064A
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tca
tca cooler
cooler
combustion engine
water inlet
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赵永江
魏小庆
陈松
陈福兵
赵子哲
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Luculent Smart Technologies Co ltd
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Luculent Smart Technologies Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/003—Arrangements for testing or measuring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/12—Cooling of plants
    • F02C7/16—Cooling of plants characterised by cooling medium
    • F02C7/18—Cooling of plants characterised by cooling medium the medium being gaseous, e.g. air
    • F02C7/185—Cooling means for reducing the temperature of the cooling air or gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/80—Diagnostics

Abstract

The invention discloses a method for judging performance of a TCA cooler of a combustion engine based on historical data analysis, which comprises the following steps: acquiring historical data of parameters of a gas turbine set, screening the historical data, and acquiring a data sample under a normal working condition; performing correlation analysis on the data samples to obtain parameter correlation results; according to the load of the gas turbine, carrying out interval division on the data samples to obtain the minimum value of the water inlet flow of the TCA cooler in each interval; combining the design value of the water inlet flow of the TCA cooler with the actual operation characteristic thereof to obtain the minimum value of the water inlet flow of the TCA cooler under different loads of the combustion engine; and judging the performance condition of the TCA cooler according to the deviation of the real-time value and the minimum value of the water inlet flow of the TCA cooler. The invention can monitor the change of the water inflow of the TCA cooler under different gas turbine load working conditions, thereby judging the performance of the TCA cooler; can in time report to the police when TCA cooler inflow is unusual, avoid turbine rotor and moving blade to be in for a long time and work under the overtemperature condition and reduce turbine rotor and moving blade's life-span.

Description

Historical data analysis-based performance judgment method for TCA cooler of combustion engine
Technical Field
The invention relates to the technical field of combustion engine performance analysis, in particular to a method for judging performance of a combustion engine TCA cooler based on historical data analysis.
Background
During normal operation of the combustion engine, the turbine rotor and the turbine blades exposed to the hot combustion gases must be cooled by the turbine cooling air. The cooling air is pumped out from the air pumping port of the compressor, cooled by the TCA cooler and sent to the turbine rotor and the front of the blades. The performance of a TCA (ternary content addressable computing) system, namely a turbine cooling air system and a TCA cooler of the gas turbine is good and bad, and the performance becomes an important judgment basis for the working life of a turbine rotor and a moving blade in a high-temperature environment.
At present, a mode for judging the performance of a TCA cooler by field operation and inspection personnel is mainly characterized in that the performance of the TCA cooler is judged according to the opening feedback of a TCA cooler water inlet temperature control valve in a TCS system and a design value provided by a TCA cooler manufacturer of the water inlet flow of the TCA cooler; however, when the gas turbine unit participates in peak shaving of the power grid, the load is variable and the influence of multi-parameter variables often causes the TCA cooler to deviate from the design working condition to operate; meanwhile, after the gas turbine unit operates for a long time, the design value of the original parameter also has a deviation condition, so that the performance of the TCA cooler is difficult to judge, and the false alarm condition of the TCS system is more.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the technical problem solved by the invention is as follows: when the TCA cooler runs off the design working condition or after the gas turbine unit runs for a long time and the design value of the original parameter is deviated, the performance of the TCA cooler is difficult to judge, and the false alarm condition of the TCS system is more.
In order to solve the technical problems, the invention provides the following technical scheme: a method for judging performance of a TCA cooler of a combustion engine based on historical data analysis comprises the following steps: obtaining historical data of parameters of the gas turbine set, screening the historical data, and obtaining a data sample under a normal working condition;
performing correlation analysis based on the data sample to obtain a strong correlation between the water inflow of the TCA cooler and the load of the combustion engine;
according to the load of the gas turbine, carrying out interval division on the data sample to obtain the minimum value of the water inlet flow of the TCA cooler in each interval;
combining the design value of the water inlet flow of the TCA cooler with the actual operation characteristic thereof to obtain the minimum value of the water inlet flow of the TCA cooler under different loads of the combustion engine;
and judging the performance condition of the TCA cooler according to the deviation of the real-time value and the minimum value of the water inlet flow of the TCA cooler.
As a preferable scheme of the method for judging performance of the TCA cooler of the combustion engine based on the historical data analysis, the method comprises the following steps: the historical data of the gas turbine set parameters comprises:
the method comprises the steps of measuring load of the gas turbine, TCA cooler water inlet pressure, TCA cooler water inlet flow, TCA shutoff valve A state, TCA shutoff valve B state, TCA return water flow control valve position on the HRSG side, TCA return water flow control valve state on the COND side and historical data of TCA return water pressure on the HRSG side within a period of time.
As a preferable scheme of the method for judging performance of the TCA cooler of the combustion engine based on the historical data analysis, the method comprises the following steps: the acquiring of the data sample D under the normal working condition comprises the following steps:
data in the unit shutdown period are removed according to the load of the combustion engine;
according to the states of a TCA shut-off valve A and a TCA shut-off valve B, rejecting data that the TCA water inlet shut-off valve is not opened and the water inlet flow of the TCA cooler is 0;
according to the state of a TCA return water flow control valve on the COND side, special working condition data that TCA cooling return water is returned to the condenser side are removed, and only data that TCA cooling return water is completely returned to a high-pressure steam drum of the boiler are reserved;
and eliminating data abnormal due to data acquisition reasons.
As a preferable scheme of the method for judging performance of the TCA cooler of the combustion engine based on the historical data analysis, the method comprises the following steps: the correlation analysis comprises:
analyzing the correlation among the engine load, the TCA cooler water inlet pressure, the TCA return water pressure on the HRSG side, the TCA return water flow control valve position on the HRSG side and the TCA cooler water inlet flow based on the data sample D, wherein the obtained analysis result shows that: the water inlet flow of the TCA cooler has strong correlation with the load of the gas turbine, the water inlet pressure of the TCA cooler, the TCA return water pressure on the HRSG side and the valve position of the TCA return water flow control valve on the HRSG side, wherein the correlation degrees are 0.9246, 0.9101, 0.8797 and 0.8195 respectively; based on the correlation data, it can be known that: the TCA cooler water intake flow correlates most strongly with the engine load.
As a preferable scheme of the method for judging performance of the TCA cooler of the combustion engine based on the historical data analysis, the method comprises the following steps: the interval division of the data samples includes:
based on the correlation analysis result, taking the load of the combustion engine with the highest correlation degree with the water inlet flow of the TCA cooler as a reference, and performing ascending arrangement on the data sample D to obtain a sample Ds; and the engine load in the sample Ds is divided into sections.
As a preferable scheme of the method for judging performance of the TCA cooler of the combustion engine based on the historical data analysis, the method comprises the following steps: the section division of the combustion engine load in the sample Ds comprises the following steps:
starting from the minimum load of the gas turbine, each interval is 1MW and is divided into intervals I 1 、I 2 …I n (ii) a When the interval is divided, if the size of the interval where the maximum load value of the gas turbine is less than 1MW, the actual size of the interval where the maximum load value of the gas turbine is located is taken as the standard.
As a preferable scheme of the method for judging performance of the TCA cooler of the combustion engine based on the historical data analysis, the method comprises the following steps: the step of obtaining the minimum value of the water inlet flow of the TCA cooler in each interval comprises the following steps:
in a sectionI k Performing ascending arrangement according to the water inlet flow of the TCA cooler, wherein k is more than or equal to 1 and less than or equal to n;
screening the data of each interval after ascending sequence arrangement, and eliminating the data which do not accord with the valve position changes of the TCA cooler water inlet pressure, the TCA return water pressure HRSG side and the TCA return water flow control valve HRSG side to obtain an interval I 1 '，I 2 '，…，I n '；
In the interval I k ' Internally, the minimum value of the TCA cooler inlet flow is obtained.
As a preferable scheme of the method for judging performance of the TCA cooler of the combustion engine based on the historical data analysis, the method comprises the following steps: the acquiring of the minimum value of the water inlet flow of the TCA cooler under different combustion engine loads comprises the following steps:
and (4) carrying out interval division on the engine load again by combining a TCA cooler water inflow design value provided by an equipment manufacturer and the actual operation characteristic of the TCA cooler.
As a preferable scheme of the method for judging performance of the TCA cooler of the combustion engine based on the historical data analysis, the method comprises the following steps: the method for acquiring the minimum value of the water inlet flow of the TCA cooler under different combustion engine loads further comprises the following steps:
and calculating to obtain the minimum value of the TCA cooler water inflow in different engine load intervals or a linear function relation between the engine load and the minimum value of the TCA cooler water inflow, thereby obtaining the minimum value of the TCA cooler water inflow at different engine loads.
As a preferable scheme of the method for judging performance of the TCA cooler of the combustion engine based on the historical data analysis, the method comprises the following steps: the judging of the performance condition of the TCA cooler comprises the following steps:
if the deviation delta is less than a preset value and lasts for a preset time, the performance of the TCA cooler is abnormal;
wherein the deviation δ = TCA cooler intake flow real-time value — minimum value of TCA cooler intake flow at current engine load.
The invention has the beneficial effects that: the method can monitor the change condition of the water inflow flow of the TCA cooler in real time during the running of the combustion engine under different load working conditions of the combustion engine, thereby judging the performance of the TCA cooler; can in time remind the operation personnel to adjust when TCA cooler inflow is unusual, avoid turbine rotor and moving blade to be in work under the overtemperature condition for a long time and reduce the life-span of turbine rotor and moving blade.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic diagram of a basic flow chart of a method for determining performance of a TCA cooler of a combustion engine based on historical data analysis according to an embodiment of the invention;
fig. 2 is a schematic diagram of a minimum piecewise function of intake flow rates of TCA coolers at different load segments of a combustion engine TCA cooler performance determination method based on historical data analysis according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a mechanism rule model of a method for determining performance of a TCA cooler of a combustion engine based on historical data analysis according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures of the present invention are described in detail below, and it is apparent that the described embodiments are a part, not all or all of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not necessarily enlarged to scale, and are merely exemplary, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Also in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1-2, for an embodiment of the present invention, a method for determining performance of a TCA cooler of a combustion engine based on historical data analysis is provided, including:
s1: obtaining historical data of parameters of the gas turbine set, screening the historical data, and obtaining a data sample under a normal working condition;
it should be noted that, in this embodiment, historical data of the gas turbine set parameters in a period of time is acquired through a data interface system of a gas Turbine Control System (TCS) or a plant-level monitoring information system (SIS system), and the data distribution table 1 shows that the data amount is greater than 100000 pieces;
TABLE 1 historical data distribution Table
Figure BDA0003726368240000051
Figure BDA0003726368240000061
Further, the relevant parameters involved in the historical data include: the method comprises the steps of load of the gas turbine, water inlet pressure of a TCA cooler, water inlet flow of the TCA cooler, state of a TCA shutoff valve A, state of a TCA shutoff valve B, valve position of a TCA return water flow control valve (HRSG side), state of the TCA return water flow control valve (COND side) and pressure of TCA return water (HRSG side).
Further, the historical data is filtered, and the method comprises the following steps:
firstly, data of a unit during shutdown are removed through load of a combustion engine;
then, data that the TCA water inlet shutoff valve is not opened and the water inlet flow of the TCA cooler is 0 are eliminated according to the states of the TCA shutoff valve A and the TCA shutoff valve B;
then, according to the state (COND side) of the TCA return water flow control valve, eliminating special working condition data of TCA cooling return water to the side of the condenser, and only keeping data that the TCA cooling return water completely returns to a high-pressure steam drum of the boiler;
and finally, rejecting abnormal data caused by data acquisition reasons such as measuring point drift and the like, and finally obtaining a data sample D under a normal working condition.
S2: performing correlation analysis based on the data sample to obtain a strong correlation between the water inflow of the TCA cooler and the load of the combustion engine;
further, by means of data analysis, correlation between the engine load, the TCA cooler water inlet pressure, the TCA return water pressure (HRSG side), the TCA return water flow control valve (HRSG side) valve position and the TCA cooler water inlet flow is analyzed based on the data sample D; the analysis results show that the TCA cooler inlet water flow rate has correlations with the load of the combustion engine, the TCA cooler inlet water pressure, the TCA return water pressure (HRSG-side) and the TCA return water flow control valve (HRSG-side) valve positions, and the correlations are 0.9246, 0.9101, 0.8797 and 0.8195, respectively, as shown in table 2.
TABLE 2 correlation analysis results of parameters
Figure BDA0003726368240000071
As can be seen from the above table, the dependence of the TCA cooler water inflow rate on the engine load is the strongest.
Note that, since the TCA shutoff valve a state, the TCA shutoff valve B state are on-off values, and the TCA return water flow rate control valve state (COND side) is a normally-off state, the correlation analysis of the parameters is not performed.
S3: according to the load of the gas turbine, carrying out interval division on the data sample to obtain the minimum value of the water inlet flow of the TCA cooler in each interval;
it should be noted that, based on the correlation analysis result, it is known that the correlation between the TCA cooler intake flow and the engine load is the strongest, and therefore, the data sample D is processed by taking the engine load as a reference.
Further, arranging the data samples D in an ascending order by taking the load of the gas turbine as a reference to obtain samples Ds;
furthermore, the load of the gas turbine in the sample Ds is divided into intervals, starting from the minimum value of the load of the gas turbine, the size of each interval is 1MW, and an interval I is obtained 1 、I 2 …I n ；
It should be noted that, when the interval is divided, if the maximum value of the load of the combustion engine falls in the interval smaller than 1MW, the actual size of the interval is taken as the standard.
Further, in the interval I k (1K is more than or equal to k and less than or equal to n), and the water inlet flow of the TCA cooler is taken as a reference to carry out ascending arrangement; screening the data after the ascending sequence of each interval to obtain an interval I 1 '、I 2 '…I n '；
It should be noted that the data re-screening based on the TCA cooler water inlet flow rate is to remove data that does not comply with the TCA cooler water inlet pressure, the TCA return water pressure (HRSG side), and the TCA return water flow control valve (HRSG side) valve position variation.
Further, in the interval I k ' (k is more than or equal to 1 and less than or equal to n) and finding out the minimum value of the water inlet flow of the TCA cooler;
it should be noted that, in the interval I k ' k is more than or equal to 1 and less than or equal to n, and respectively finding out the minimum value of the water inlet flow of the TCA cooler, thereby obtaining the minimum value of the water inlet flow of the TCA cooler in different load sections of the combustion engine.
S4: combining the design value of the water inlet flow of the TCA cooler with the actual operation characteristic thereof to obtain the minimum value of the water inlet flow of the TCA cooler under different loads of the combustion engine;
further, by combining a TCA cooler intake flow design value and a TCA cooler actual operation characteristic provided by an equipment manufacturer, interval division is performed on the load of the combustion engine again based on a principle that the manufacturer divides the load interval of the combustion engine when the TCA cooler leaves the factory, linear fitting is performed on the minimum value of the intake flow of the TCA cooler in each interval, and a calculation method for obtaining the minimum value of the intake flow of the TCA cooler in different load intervals of the combustion engine is obtained, as shown in table 3, and then the minimum value of the intake flow of the TCA cooler in different load of the combustion engine is obtained, as shown in fig. 2.
TABLE 3 minimum value calculation method for TCA cooler inflow water flow under different gas turbine load intervals
Gas turbine load interval (MW) TCA cooler inlet flow minimum (t/h)
s＝0～130 q＝35
s＝130～150 q＝0.1s+22
s＝150～200 q＝0.16s+13
s＝200～260 q＝0.283s-11.667
s＝260～290 q＝0.1s+36
s =290 or more q＝65
It should be noted that, the re-dividing of the intervals is based on the principle of combining the actual operation situation on site and the division of the fuel load intervals by the manufacturer when the equipment leaves the factory; in each interval divided by a manufacturer to the engine load when the equipment leaves a factory, the TCA cooler water inlet flow rate and the engine load have a better primary linear relation, so that the minimum value of the TCA cooler water inlet flow rate at different engine loads can be obtained through the primary linear relation of the TCA cooler water inlet flow rate and the engine load.
S5: judging the performance condition of the TCA cooler according to the deviation of the real-time value and the minimum value of the water inlet flow of the TCA cooler;
it should be noted that the deviation δ between the real-time value and the minimum value of the TCA cooler intake water flow rate is calculated by the formula: δ = TCA cooler intake flow real-time value — minimum value of TCA cooler intake flow at current engine load.
Furthermore, when the delta is less than the preset value and the preset time is continued for a long time, the water inlet flow of the TCA cooler is abnormal, and the performance of the TCA cooler is judged to be abnormal.
It should be noted that the invention finds out the relationship between the load of the combustion engine and the water inlet flow of the TCA cooler by analyzing historical data; the method comprises the steps of carrying out interval division on the load of the gas turbine, finding out the minimum value of the water inlet flow of the TCA cooler when the load of the gas turbine is different, calculating the deviation between the real-time value and the minimum value of the water inlet flow of the TCA cooler, and judging whether the water inlet flow of the TCA cooler is abnormal or not, so that whether the performance of the TCA cooler is abnormal or not is quickly judged.
Example 2
Referring to fig. 3, for an embodiment of the present invention, a verification test of a method for determining performance of a TCA cooler of a combustion engine based on historical data analysis is provided, and to verify and explain technical effects adopted in the method, the embodiment uses a method for monitoring performance of the TCA cooler by a TCS system of the combustion engine to perform a comparison test with the method for monitoring performance of the TCA cooler of the present invention, and uses a scientific demonstration means to compare test results to verify a real effect of the present invention.
Regarding the judgment of the performance of the TCA cooler, the TCS system is mainly based on the "opening feedback of the TCA cooler inlet temperature control valve" and the deviation of the real-time value of the "TCA cooler inlet flow rate" from the design value (provided by the TCA cooler manufacturer). However, when the gas turbine unit participates in peak shaving of the power grid, the load is variable and the influence of multi-parameter variables often causes the TCA cooler to deviate from the design working condition to operate; meanwhile, after the gas turbine unit operates for a long time, the design value of the original parameter also has a deviation condition, so that the performance of the TCA cooler is difficult to judge, and the false alarm condition of the TCS system is more.
According to the method, through analysis of historical data, the relation between the load of the combustion engine and the water inflow rate of the TCA cooler is found, a plurality of combustion engine load sections are divided, and the alarm limit value of the water inflow rate of the TCA cooler is set under different working conditions.
In field application, the alarm accuracy rate of performance abnormity of the TCA cooler based on the TCS system is far lower than that of the method, and the alarm limit value of the TCS system is fixed and the TCA cooler can be influenced by load and other factors during operation, so that the alarm limit value of the TCS system cannot be matched with an actual application scene, and the function of accurate alarm is realized; the method can adjust the alarm limit value based on different working conditions, so that the alarm can be timely and accurately given out when the inflow of the TCA cooler is abnormal.
The two methods are applied and found in a real scene, so that the method has high alarm accuracy, and the false alarm rate is far lower than that of a TCS (train control system); while the TCA cooler performance was found to be abnormally faster than the TCS system, where the comparative data for the two methods are shown in tables 4 and 5.
TABLE 4 comparison of the effects of TCS system and the method
Figure BDA0003726368240000101
TABLE 5TCS System and method comparison test data
TCS system The method of the invention
Total number of tests 17 12
Number of correct alarms 11 12
Ratio of correct alarm times 64.7％ 100％
Number of false alarms 6 0
Ratio of false alarm times 35.3％ 0
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (10)

1. A method for judging performance of a TCA cooler of a combustion engine based on historical data analysis is characterized by comprising the following steps:
acquiring historical data of parameters of a gas turbine set, screening the historical data, and acquiring a data sample under a normal working condition;
performing correlation analysis based on the data sample to obtain a strong correlation between the water inflow of the TCA cooler and the load of the combustion engine;
according to the load of the gas turbine, carrying out interval division on the data sample to obtain the minimum value of the water inlet flow of the TCA cooler in each interval;
combining a design value of the water inlet flow of the TCA cooler with the actual operation characteristic of the TCA cooler to obtain the minimum value of the water inlet flow of the TCA cooler under different loads of the combustion engine;
and judging the performance condition of the TCA cooler according to the deviation of the real-time value and the minimum value of the water inlet flow of the TCA cooler.
2. A method of determining the performance of a TCA cooler of a combustion engine based on historical data analysis, as claimed in claim 1, wherein: the historical data of the gas turbine unit parameters comprises:
the load of the gas turbine, the water inlet pressure of a TCA cooler, the water inlet flow of the TCA cooler, the state of a TCA shutoff valve A, the state of a TCA shutoff valve B, the valve position of a TCA return water flow control valve on the HRSG side, the state of the TCA return water flow control valve on the COND side and the historical data of the TCA return water pressure on the HRSG side within a period of time.
3. The method for judging performance of a TCA cooler of a combustion engine based on historical data analysis as claimed in claim 2, wherein the obtaining data samples D under normal conditions comprises:
data of the unit during the shutdown period are removed according to the load of the combustion engine;
according to the states of a TCA shut-off valve A and a TCA shut-off valve B, rejecting data that the TCA water inlet shut-off valve is not opened and the water inlet flow of the TCA cooler is 0;
according to the state of a TCA return water flow control valve on the COND side, special working condition data of TCA cooling return water to the condenser side are removed, and only data of TCA cooling return water returning to a boiler high-pressure steam drum are reserved;
and eliminating data which cause abnormity due to data acquisition.
4. A method of determining the performance of a TCA cooler of a combustion engine based on historical data analysis according to claim 1 or 3, wherein the correlation analysis includes:
analyzing the correlation among the engine load, the TCA cooler water inlet pressure, the TCA return water pressure on the HRSG side, the TCA return water flow control valve position on the HRSG side and the TCA cooler water inlet flow based on the data sample D, wherein the obtained analysis result shows that: the water inlet flow of the TCA cooler has strong correlation with the load of the gas turbine, the water inlet pressure of the TCA cooler, the TCA return water pressure on the HRSG side and the valve position of the TCA return water flow control valve on the HRSG side, wherein the correlation degrees are 0.9246, 0.9101, 0.8797 and 0.8195 respectively; based on the correlation data, it can be known that: the TCA cooler water intake flow correlates most strongly with the engine load.
5. The method for determining performance of a TCA cooler of a combustion engine based on historical data analysis of claim 4, wherein the dividing the interval of the data samples includes:
based on the correlation analysis result, taking the load of the combustion engine with the highest correlation degree with the water inlet flow of the TCA cooler as a reference, performing ascending arrangement on the data sample D to obtain a sample Ds; and the load of the combustion engine in the sample Ds is divided into sections.
6. The method for judging performance of a TCA cooler of a combustion engine based on historical data analysis according to claim 5, wherein the dividing the interval of the load of the combustion engine in the sample Ds includes:
starting from the minimum load of the gas turbine, each interval is 1MW and is divided into intervals I 1 、I 2 …I n (ii) a When the interval is divided, if the size of the interval where the maximum load value of the gas turbine is less than 1MW, the actual size of the interval where the maximum load value of the gas turbine is located is taken as the standard.
7. The method for judging performance of a TCA cooler of a combustion engine based on historical data analysis of claim 6, wherein obtaining the minimum value of the TCA cooler inlet flow in each interval comprises:
in the interval I k Performing ascending arrangement according to the water inlet flow of the TCA cooler, wherein k is more than or equal to 1 and less than or equal to n;
screening the data of each interval after ascending sequence arrangement, and eliminating the data which do not accord with the TCA cooler water inlet pressure, the TCA backwater pressure HRSG side and the TCA backwater flow control valve HRSG side valve position change to obtain an interval I 1 '，I 2 '，…，I n '；
In the interval I k ' Internally, the minimum value of the TCA cooler inlet flow is obtained.
8. The method for judging performance of the TCA cooler of the combustion engine based on historical data analysis of claim 7, wherein the obtaining the minimum value of the intake flow of the TCA cooler under different loads of the combustion engine comprises:
and (4) carrying out interval division on the engine load again by combining a TCA cooler water inflow design value provided by an equipment manufacturer and the actual operation characteristic of the TCA cooler.
9. The method for determining performance of a TCA cooler of a combustion engine based on historical data analysis of claim 8, wherein the obtaining of the minimum value of the TCA cooler water inflow at different combustion engine loads further comprises:
and calculating to obtain the minimum value of the TCA cooler water inflow in different engine load intervals or a linear function relation between the engine load and the minimum value of the TCA cooler water inflow, thereby obtaining the minimum value of the TCA cooler water inflow at different engine loads.
10. The method of claim 9, wherein the determining TCA cooler performance based on historical data analysis comprises:
if the deviation delta is less than a preset value and lasts for a preset time, the performance of the TCA cooler is abnormal;
wherein the deviation δ = TCA cooler intake flow real-time value — minimum value of TCA cooler intake flow at current engine load.
CN202210774718.0A 2022-07-01 2022-07-01 Historical data analysis-based performance judgment method for TCA cooler of combustion engine Pending CN115355064A (en)

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