CN116701908A - Method and device for judging scaling of turbine through-flow part, overhauling method and system - Google Patents
Method and device for judging scaling of turbine through-flow part, overhauling method and system Download PDFInfo
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Abstract
The invention discloses a scaling judgment method, a scaling judgment device, a scaling maintenance method and a scaling maintenance system for a turbine through-flow part. The scaling judging method comprises the following steps: and establishing a data analysis model. And obtaining a characteristic change curve of the through-flow part according to the data analysis model. And according to the data analysis model, a reference change curve of the through-flow part is obtained. Judging whether scaling phenomenon occurs in the through-flow part according to the characteristic change curve and the reference change curve. The method for judging the scaling of the turbine through-flow part does not need to stop the generator set, and can conveniently and effectively judge the scaling state of the turbine through-flow part only by collecting the operation data of the turbine through-flow part.
Description
Technical Field
The invention belongs to a method and a device for judging scaling of a turbine through-flow part, and a method and a system for overhauling the turbine through-flow part.
Background
Among the numerous facilities in thermal power plants, a turbine generator set is an important facility unit for providing power generation capacity for thermal power generation. The safe and stable operation of the steam turbine generator unit is a basic condition for ensuring the normal power generation of the thermal power plant. Steam turbines, also known as steam turbines, are power plants that convert the energy of steam into mechanical work, and are also the most important components of steam power plants. In practical application, the turbine is mainly used as a prime mover for power generation, once salt deposition and scaling are carried out on the through-flow part of the turbine, the output loss and efficiency of the turbine are reduced, and serious accidents of equipment damage are caused, so that the safety, economy and stable operation of the unit are greatly influenced.
At present, whether the through-flow part of the generator set of the steam turbine is scaled is often judged after the judgment, namely the generator set is stopped, and the through-flow part is detached for judgment, so that remedial and relieving measures cannot be timely taken. In the checking process, the generator set is forced to stop and uncover the cylinder, and shot blasting is carried out on the through-flow part, so that the maintenance period is long, the maintenance workload is large, and the problem of the through-flow part can not be found in time, so that uncontrollable risks exist in the safety of the host equipment, and non-stop accidents are caused by the dynamic and static friction unit when serious.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a method and a device for judging scaling in a steam turbine.
According to an embodiment of the first aspect of the present invention, there is provided a fouling judgment method for a turbine through-flow section, including the steps of:
s1: establishing a data analysis model;
S2: according to the data analysis model, a characteristic change curve of the through-flow part is obtained, and according to the data analysis model, a reference change curve of the through-flow part is obtained;
s3: judging whether scaling phenomenon occurs in the through-flow part according to the characteristic change curve and the reference change curve.
Preferably, the step S1 specifically includes: collecting the daily main water supply flow, main steam flow, monitoring section pressure, high-pressure exhaust pressure, monitoring section temperature, main water supply temperature, thrust bearing temperature, axial displacement, condensate flow and regulating stage pressure of the through-flow part; calculating the difference value between the main water supply flow and the main steam flow of each day of the ventilation part to obtain a first flow difference value; calculating the difference value between the high-pressure exhaust pressure of the ventilation part and the pressure of the monitoring section every day to obtain the pressure difference value of the ventilation part every day; calculating the difference value between the temperature of the monitoring section and the temperature of the main water supply to obtain the daily temperature difference value of the ventilation part; calculating the difference value between the daily condensate flow and the main water supply flow of the through-flow part to obtain a second flow difference value; the data are the data analysis model.
Preferably, the characteristic change curve includes a plurality of pieces, respectively: the method comprises the steps of a first flow difference value change curve of a turbine through-flow part, a monitoring section pressure change curve of the through-flow part, a pressure difference value change curve of the through-flow part, a temperature difference value change curve of the through-flow part, a thrust bearing temperature change curve of the through-flow part, an axial displacement change curve of the through-flow part and a second flow difference value change curve of the through-flow part.
Preferably, in the step S2, a characteristic change curve of the through-flow portion is obtained according to the data analysis model, and the method specifically includes: drawing a first flow difference value change curve of the turbine through-flow part according to the first flow difference value, namely a difference value change curve between the main steam flow and the main water supply flow of the through-flow part; drawing a monitoring section pressure change curve of the through-flow part according to the monitoring section pressure; according to the pressure difference, a pressure difference change curve of the ventilation part is drawn, namely, a difference change curve between the high-pressure exhaust pressure of the ventilation part and the pressure of the monitoring section; drawing a temperature difference change curve of the through-flow part according to the temperature difference, namely a difference change curve between the temperature of the monitoring section of the through-flow part and the temperature of main water supply; drawing a thrust bearing temperature change curve of the through-flow part according to the thrust bearing temperature; drawing an axial displacement change curve of the through-flow part according to the axial displacement; and drawing a second flow difference value change curve of the through-flow part according to the second flow difference value, namely a difference value change curve between the condensate flow of the through-flow part and the main water supply flow.
Preferably, in the step S2, a reference change curve of the through-flow portion is obtained according to the data analysis model, and the method specifically includes: and drawing a regulating stage pressure change curve of the through-flow part according to the regulating stage pressure of the through-flow part, thereby obtaining the reference change curve.
Preferably, the step S3 specifically includes: respectively verifying the correlation between a plurality of characteristic change curves and the reference change curve, and acquiring a target characteristic change curve according to the correlation; carrying out scatter diagram analysis on the target characteristic change curve, and carrying out linear fitting to obtain a linear fitting curve; judging whether scaling phenomenon occurs in the through-flow part according to the change trend of the linear fitting curve of all target characteristic change curves: if the linear fitting curve is in an ascending trend, judging that scaling phenomenon occurs in the through-flow part; and if the linear fitting curve is in a leveling or descending trend, judging that the scaling phenomenon does not occur in the through-flow part.
Preferably, the step of verifying the correlation between the plurality of characteristic change curves and the reference change curve, and obtaining the target characteristic change curve according to the correlation, includes the steps of: calculating correlation coefficients of the characteristic change curve and the reference change curve respectively; and judging the correlation of other characteristic change curves by taking the correlation coefficient between the difference change curve between the main steam flow and the main water supply flow of the through flow part and the reference change curve as a reference coefficient: when the correlation coefficient of other characteristic change curves is larger than or equal to the reference coefficient, judging that the characteristic change curve has correlation with a reference change curve; when the correlation coefficient of other characteristic change curves is smaller than the reference coefficient, judging that the characteristic change curve and the reference change curve have no correlation; if the characteristic change curve has correlation with the reference change curve, the characteristic change curve is considered as a reference for judging whether scaling phenomenon occurs in the through-flow part, namely, the characteristic change curve is a target characteristic change curve; and if the characteristic change curve and the characteristic change curve have no correlation, excluding the reference.
According to an embodiment of the second aspect of the present invention, there is provided a method for repairing a turbine through-flow portion, comprising the steps of: judging whether the through-flow part of the steam turbine has a scaling phenomenon or not according to the scaling judging method of the through-flow part of the steam turbine; and if the scaling phenomenon does not occur in the through-flow part, determining that the through-flow part operates normally.
Preferably, if it is determined that the fouling phenomenon occurs in the through-flow part, the fouling treatment process of the through-flow part is started to repair the through-flow part, and whether the repaired through-flow part has the fouling phenomenon is determined again according to the fouling determination method of the turbine through-flow part, so that the cycle is performed until the fouling phenomenon of the through-flow part is eliminated.
According to an embodiment of the third aspect of the present invention, there is provided a fouling judgment apparatus for a turbine through-flow section, comprising: the device comprises a processing module, an analysis module and a judgment module; the processing module is used for establishing a data analysis model; the analysis module is connected with the processing module and is used for obtaining a characteristic change curve of the through-flow part according to the data analysis model and obtaining a reference change curve of the through-flow part according to the data analysis model; the judging module is connected with the analyzing module and is used for judging whether the scaling phenomenon occurs in the through-flow part according to the characteristic change curve and the reference change curve.
Preferably, the processing module comprises an acquisition unit, a first calculation unit, a second calculation unit, a third calculation unit and a fourth calculation unit, wherein the acquisition unit is used for acquiring the main water supply flow, the main steam flow, the monitoring section pressure, the high-pressure exhaust steam pressure, the monitoring section temperature, the main water supply temperature, the thrust bearing temperature, the axial displacement and the condensate flow of the through-flow part every day, and the first calculation unit is connected with the acquisition unit and used for carrying out difference calculation on the main water supply flow and the main steam flow of the through-flow part every day to obtain a first flow difference; the second calculation unit is connected with the acquisition unit and is used for calculating the difference value between the pressure of the high-pressure exhaust steam and the pressure of the monitoring section of the ventilation part every day to obtain the pressure difference value of the ventilation part every day; the third calculation unit is connected with the acquisition unit and is used for calculating the difference value between the temperature of the monitoring section and the temperature of the main water supply to obtain the daily temperature difference value of the ventilation part; the fourth calculation unit is connected with the acquisition unit and is used for calculating the difference value between the daily condensate flow and the main water supply flow of the through flow part to obtain a second flow difference value.
Preferably, the analysis module comprises a first processing unit, a second processing unit, a third processing unit, a fourth processing unit, a fifth processing unit, a sixth processing unit, a seventh processing unit and an eighth processing unit; the first processing unit is connected with the processing module and is used for drawing a first flow difference value change curve of the turbine through-flow part according to the first flow difference value, namely a difference value change curve between the main steam flow and the main water supply flow of the through-flow part; the second processing unit is connected with the processing module and is used for drawing a monitoring section pressure change curve of the ventilation part according to the monitoring section pressure; the third processing unit is connected with the processing module and is used for drawing a pressure difference change curve of the ventilation part according to the pressure difference, namely a difference change curve between the high-pressure exhaust pressure of the ventilation part and the pressure of the monitoring section; the fourth processing unit is connected with the processing module and is used for drawing a temperature difference change curve of the through-flow part according to the temperature difference, namely a difference change curve between the temperature of the monitoring section of the through-flow part and the temperature of main water supply; the fifth processing unit is connected with the processing module and is used for drawing a thrust bearing temperature change curve of the ventilation part according to the thrust bearing temperature; the sixth processing unit is connected with the processing module and is used for drawing an axial displacement change curve of the ventilation part according to the axial displacement; the seventh processing unit is connected with the processing module and is used for drawing a second flow difference value change curve of the through-flow part according to the second flow difference value, namely a difference value change curve between the condensate flow of the through-flow part and the main water supply flow; and the eighth processing unit is connected with the processing module and is used for drawing a regulating stage pressure change curve of the through-flow part according to the regulating stage pressure of the through-flow part so as to obtain the reference change curve.
Preferably, the judging module includes: the linear fitting unit is used for generating linear fitting signals according to the first control unit; the first control unit is connected with the analysis module and used for respectively verifying the correlation between the characteristic change curves and the reference change curve and acquiring a target characteristic change curve according to the correlation; the linear fitting unit is connected with the first control unit and is used for carrying out scatter diagram analysis on the target characteristic change curve and carrying out linear fitting so as to obtain a linear fitting curve; the second control unit is connected with the linear fitting unit and is used for judging whether scaling phenomenon occurs in the through-flow part according to the change trend of the linear fitting curve of all target characteristic change curves: if the linear fitting curve is in an ascending trend, judging that scaling phenomenon occurs in the through-flow part; and if the linear fitting curve is in a leveling or descending trend, judging that the scaling phenomenon does not occur in the through-flow part.
According to an embodiment of the fourth aspect of the present invention, there is provided an inspection system for a turbine through-flow section, comprising: the scaling judgment device and the scaling treatment unit of the turbine through-flow part are arranged on the turbine; the judging device of the turbine through-flow part is used for judging whether the through-flow part has scaling phenomenon or not:
If the through-flow part is judged to not have the scaling phenomenon, an ending signal is sent out;
if the scaling phenomenon of the through-flow part is judged, a starting signal is sent out;
the scaling treatment unit is connected with the judging device of the turbine through-flow part and is used for controlling the scaling treatment flow of the through-flow part to start when receiving a starting signal and controlling the scaling treatment flow of the through-flow part to end when receiving an ending signal.
The scaling judgment method of the turbine through-flow part can establish a data analysis model by collecting the operation data of the turbine through-flow part. And then, obtaining a characteristic change curve and a reference change curve according to the data analysis model. Then, the characteristic change curve and the reference change curve are compared, so that whether the scaling phenomenon occurs in the through-flow part can be judged. Therefore, the method for judging the scaling of the turbine through-flow part does not need to stop the generator set, and the scaling state of the turbine through-flow part can be conveniently and effectively judged only by collecting the operation data of the turbine through-flow part.
Drawings
FIG. 1 is a flow chart of a fouling determination method in some embodiments of the invention;
FIG. 2 is a graph comparing a primary feedwater flow profile with a regulation stage pressure profile without initiating scale-related adjustments in some embodiments of the present invention;
FIG. 3 is a graph comparing a primary feedwater flow profile with a regulation stage pressure profile after initiating scale-related adjustment actions in some embodiments of the present invention;
FIG. 4 is a linear fit of a regulator stage pressure change curve in a scatter plot in accordance with some embodiments of the invention;
FIG. 5 is a linear fit of the main feedwater flow variation curve in a scatter plot in some embodiments of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, each unit and module involved may correspond to only one physical scale, may be composed of a plurality of physical scales, or may be integrated into one physical scale; the units and modules involved may be implemented in software or in hardware, e.g. the units and modules may be located in a processor.
In the description of the present invention, the functions and steps noted in the flowcharts and block diagrams of the present invention may occur out of the order noted in the figures without conflict.
Example 1
Referring to FIG. 1, the invention discloses a method for judging scaling of a turbine through-flow part, which comprises the following steps:
s1: and establishing a data analysis model.
S2: according to the data analysis model, obtaining a characteristic change curve of the through-flow part, and according to the data analysis model, obtaining a reference change curve of the through-flow part;
s3: judging whether scaling phenomenon occurs in the through-flow part according to the characteristic change curve and the reference change curve.
In this embodiment, step S1: and establishing a data analysis model. The method specifically comprises the following steps:
collecting the daily main water supply flow, main steam flow, monitoring section pressure, high-pressure exhaust pressure, monitoring section temperature, main water supply temperature, thrust bearing temperature, axial displacement, condensate flow and regulating stage pressure of the through-flow part;
calculating the difference value between the main water supply flow and the main steam flow of each day of the through-flow part to obtain a first flow difference value;
calculating the difference value between the high-pressure exhaust pressure of the ventilation part and the pressure of the monitoring section to obtain the pressure difference value of the ventilation part every day;
Calculating the difference value between the temperature of the monitoring section and the temperature of the main water supply to obtain the daily temperature difference value of the through-flow part;
calculating the difference value between the daily condensate flow and the main water supply flow of the through-flow part to obtain a second flow difference value; the data are data analysis models.
Specifically, various operational data may be collected by the DCS controller. The process of collecting 7 sets of data and establishing a data analysis model will be further described below:
(1) the acquisition process of the main water supply flow, the main steam flow and the first flow difference value comprises the following steps: and (3) respectively obtaining main water supply flow operation curves and main steam flow operation curves of each hour, each day and each month by collecting DCS operation data.
It should be noted that the main water supply flow rate of the through-flow portion may be collected once per hour to obtain the main water supply flow rate of the through-flow portion per hour. Then, the main water supply flow rate per hour can be calculated to obtain the main water supply flow rate per day and month. Then, based on the monthly operation data, carrying out linear engagement curve and scatter diagram combination on the daily operation data of the month to obtain the flow change trend of the main water supply flow and the main steam flow of the month; and calculating the difference value between the main steam flow and the main water supply flow, and then combining the flow difference value with a linear meshing curve and a scatter diagram to obtain the change trend of the difference value between the main steam flow and the main water supply flow in the month.
(2) The collecting process of the pressure of the monitoring section of the through-flow part comprises the following steps: first, the monitoring section refers to each section of extraction chamber in the steam turbine. Specifically, the monitoring section pressure operation curves of each hour, each day and each month are respectively obtained by collecting DCS operation data (mainly collecting pressure data of one, two and three sections of steam extraction, if no external heat supply unit can be added with four sections and five sections); and (3) carrying out linear meshing curve and scatter diagram combination on the daily operation data of the month on the basis of the monthly operation data to obtain the pressure change trend of the month.
(3) The collecting process of the pressure difference value between the high-pressure exhaust pressure and the monitoring section comprises the following steps: respectively obtaining pressure operation curves of high-pressure exhaust steam pressure and monitoring sections of each hour, each day and each month by collecting DCS operation data; based on monthly operation data, linear meshing curve is carried out on the daily operation data of the month to obtain pressure change trend of the month in a mode of combining a scatter diagram; and calculating the difference value between the high-pressure discharge and the pressure of the monitoring section, and then combining the pressure difference value with a linear meshing curve and a scatter diagram to obtain the pressure difference value change trend of the high-pressure discharge and the monitoring section in the month.
(4) Monitoring the temperature of the section, the main water supply temperature and the acquisition process of the temperature difference value: acquiring temperature of monitoring sections of each hour, each day and each month and main water supply temperature operation curves respectively by collecting DCS operation data; based on month operation data, linear meshing curve and scatter diagram are combined on the month daily operation data to obtain the month temperature change trend; and respectively carrying out difference calculation on the temperature of the monitoring section and the temperature of the main water supply, and then carrying out linear meshing curve and scatter diagram combination on the temperature difference to obtain the change trend of the difference between the temperature of the monitoring section and the temperature of the main water supply in the month.
(5) The collecting process of the thrust bearing temperature during the same load period comprises the following steps: by collecting DCS operation data, metal temperature operation curves of the front side and the back side of the thrust bearing in each hour, each day and each month are respectively obtained (mainly collecting temperatures of 4 measuring points of the front side thrust tile temperature center and temperatures of 4 measuring points of the back side thrust tile temperature center). And then, carrying out linear engagement curve and scatter diagram combination on the daily operation data of the month on the basis of the monthly operation data to obtain the metal temperature change trend of the thrust bearing of the month.
(6) The acquisition process of the axial displacement change of the same load comprises the following steps: by collecting DCS operation data, 4 measuring point operation curves of axial displacement in each hour, each day and each month are respectively obtained. Based on month operation data, linear meshing curve is carried out on the month operation data every day, and a scatter diagram is combined to obtain the axial displacement change trend of the month;
(7) the collection process of condensate flow, main water supply flow and second flow difference value: acquiring DCS operation data to respectively obtain operation curves of the condensed water flow rate and the main water supply flow rate in each hour, each day and each month; based on monthly operation data, linear meshing curve is carried out on the daily operation data of the month to obtain the flow change trend of the month in a mode of combining a scatter diagram; and respectively calculating the difference value of the condensate flow and the main water supply flow, and then combining the linear meshing curve and the scatter diagram of the flow difference value to obtain the variation trend of the difference value of the condensate flow and the main water supply flow in the month.
In this embodiment, in step S2: and obtaining a characteristic change curve of the through-flow part according to the data analysis model. The method specifically comprises the following steps:
drawing a first flow difference value change curve of the through-flow part according to the first flow difference value, namely a difference value change curve between the main steam flow and the main water supply flow of the through-flow part;
drawing a monitoring section pressure change curve of the ventilation part according to the monitoring section pressure;
according to the pressure difference, a pressure difference change curve of the ventilation part is drawn, namely, the difference change curve between the high-pressure exhaust steam pressure of the ventilation part and the pressure of the monitoring section;
drawing a temperature difference change curve of the through-flow part according to the temperature difference, namely, a difference change curve between the temperature of the monitoring section of the through-flow part and the temperature of main water supply;
drawing a thrust bearing temperature change curve of the through-flow part according to the thrust bearing temperature;
drawing an axial displacement change curve of the through-flow part according to the axial displacement;
and drawing a second flow difference value change curve of the through-flow part according to the second flow difference value, namely a difference value change curve between the condensate flow of the through-flow part and the main water supply flow.
In particular, step 2 may be implemented by a computer device. The DCS controller is connected with the computer equipment, all parameters acquired by the DCS controller are transmitted to the computer equipment, and data in the data analysis model are analyzed through an analysis module in the computer equipment, so that a characteristic change curve of the circulation part is obtained.
It should be noted that, the characteristic change curve includes a plurality of pieces, respectively: the method comprises the steps of a first flow difference value change curve of a turbine through-flow part, a monitoring section pressure change curve of the through-flow part, a pressure difference value change curve of the through-flow part, a temperature difference value change curve of the through-flow part, a thrust bearing temperature change curve of the through-flow part, an axial displacement change curve of the through-flow part and a second flow difference value change curve of the through-flow part.
In this embodiment, in step S2: and according to the data analysis model, a reference change curve of the through-flow part is obtained. The method specifically comprises the following steps: and drawing a regulating stage pressure change curve of the through-flow part according to the regulating stage pressure of the through-flow part, thereby obtaining a reference change curve.
As shown in fig. 2 and 3, the lower half of fig. 2 and 3 shows the variation of the regulating stage pressure.
In this embodiment, step S3: judging whether scaling phenomenon occurs in the through-flow part according to the characteristic change curve and the reference change curve. The method specifically comprises the following steps:
respectively verifying the correlation between the characteristic change curves and the reference change curve, and acquiring a target characteristic change curve according to the correlation;
carrying out scatter diagram analysis on the target characteristic change curve, and carrying out linear fitting to obtain a linear fitting curve;
Judging whether scaling phenomenon occurs in the through-flow part according to the change trend of the linear fitting curve of all target characteristic change curves:
if the linear fitting curve is in an ascending trend, judging that scaling phenomenon occurs in the through-flow part;
if the linear fitting curve is in a leveling or descending trend, judging that the scaling phenomenon does not occur in the through-flow part.
It should be noted that, before verifying the correlation between the characteristic change curves and the pressure of the regulating stage, whether the scaling phenomenon occurs in the through-flow portion may be determined preliminarily by a plurality of characteristic change curves. Specifically, firstly, the characteristic change curve is used for carrying out overall trend analysis, the running condition of the whole through-flow part can be obtained according to the change trend of 7 curves, if the curve rises gradually, the scaling phenomenon of the through-flow part is shown, and if the trend is stable, the scaling phenomenon is not shown or the scaling is not continuously developed in the normal running of the through-flow part. When the characteristic change curve has obvious rising trend, especially the deviation of the main water supply and main steam flow increases, the temperature and the pressure of the monitoring section increase, the scaling problem of the flow passing part is shown, the flow passing part is blocked by scaling, the flow passing area is reduced, the throttling loss increases, the heat consumption of the unit increases, and the efficiency decreases.
It should be further noted that, the characteristic change curves in the method are all affected by the scaling phenomenon, so that when the scaling phenomenon occurs in the through-flow part, the curves all have rising trend, and the situation that one characteristic change curve rises and the other characteristic change curves fall does not occur.
After preliminary verification of whether scaling phenomenon exists in the through-flow part, correlation between a plurality of characteristic change curves and a reference change curve is required to be verified, and a target characteristic change curve is acquired according to the correlation, and the method comprises the following steps:
calculating correlation coefficients R of the characteristic change curve and the reference change curve respectively;
and judging the correlation of other characteristic change curves by taking the correlation coefficient between the difference change curve between the main steam flow of the through-flow part and the main water supply flow and the reference change curve as a reference coefficient:
when the correlation coefficient of other characteristic change curves is larger than or equal to the reference coefficient, judging that the characteristic change curve and the reference change curve have correlation;
when the correlation coefficient of other characteristic change curves is smaller than the reference coefficient, judging that the characteristic change curve and the reference change curve have no correlation;
if the characteristic change curve has correlation with the reference change curve, the characteristic change curve is considered as a reference for judging whether scaling phenomenon occurs in the through-flow part, namely, the characteristic change curve is a target characteristic change curve;
And if the characteristic change curve and the characteristic change curve have no correlation, excluding the reference.
In this embodiment, it is mainly determined whether the through-flow portion has a scaling phenomenon by a trend of a variation in a difference between the main steam flow rate and the main feedwater flow rate of the through-flow portion. Other characteristic change curves can be used for assisting in judging whether scaling phenomenon exists in the through-flow part. The other characteristic curves are considered to have a reference value only if their correlation R is equal to or greater than the correlation R between the first flow difference and the regulating-stage pressure.
Specifically, judging whether scaling phenomenon occurs in the through-flow part according to the change trend of the linear fitting curve of all the characteristic change curves which are counted into the reference: if the linear fitting curve is in an ascending trend, judging that scaling phenomenon occurs in the through-flow part; if the linear fitting curve is in a leveling or descending trend, judging that the scaling phenomenon does not occur in the through-flow part. Thus, the scaling judgment of the turbine through-flow part is completed.
In other embodiments, the primary feed water flow may also be compared to the regulator stage pressure profile to assist in determining the risk of fouling of the flow-through portion. Referring to fig. 2 and 3, fig. 2 illustrates exemplary relationships between main feedwater flow and regulation stage pressure for a period of time for a turbine set. It can be seen that the trend of the regulation stage pressure change increases month by month before the relevant adjustment measures after fouling are not started (for example: putting condensate device into operation), and that the regulation stage pressure has reached 18.97MPa when the feedwater flow is as low as 989t/h, thus suggesting that the unit economy decreases month by month. At this time, it can be judged that the fouling phenomenon has occurred in the through-flow portion.
In addition, FIG. 3 shows a graph of the trend of the unit regulation stage pressure versus the main feedwater flow after relevant measures to inhibit scaling are taken, i.e., during a period of time after the condensate system is put into operation, under conditions where condensate is treated at full operating conditions. It can be seen that the pressure change of the regulating stage is stable under the same working condition, no obvious increase occurs, which indicates that the scaling problem of the through-flow part is controlled, and the output of the unit is not reduced.
In still other embodiments, referring to fig. 4 and 5, fig. 4 is a linear fit of the flow portion regulation stage pressure profile in a scatter plot and fig. 5 is a linear fit of the main feedwater flow profile in a scatter plot. It can be seen that the linear fitting curve of the main feedwater flow has a decreasing trend, and it can be judged that no obvious scaling phenomenon occurs in the flow-through part.
In summary, the method for judging scaling of the turbine through-flow part has the following advantages: the measuring principle is simple, the implementation is convenient, the collection and the measurement of the operation data of the steam turbine can be completed by using the DCS controller, and a sensor is not required to be additionally arranged. Not only meets the daily data acquisition and measurement requirements; the scale fault early warning of the through-flow part can be realized through data analysis and an online monitoring system.
Example 2
The invention also discloses a maintenance method of the turbine through-flow part, which comprises the following steps:
according to the method for judging scaling of the turbine through-flow portion in example 1, it is judged whether or not scaling phenomenon occurs in the through-flow portion;
and if the scaling phenomenon does not occur in the through-flow part, determining that the through-flow part operates normally.
If it is determined that the fouling phenomenon occurs in the through-flow portion, the fouling treatment flow of the through-flow portion is started to repair the through-flow portion, and whether the repaired through-flow portion has the fouling phenomenon is judged again according to the fouling judgment method of the turbine through-flow portion in embodiment 1, and the cycle is performed until the fouling phenomenon of the through-flow portion is eliminated.
Specifically, after confirming that the parameters are abnormal and there is a risk of scaling, a scaling treatment process is performed on the flow-through portion. The scaling treatment flow comprises unit operation mode adjustment, unit operation parameter adjustment, unit steam-water system inspection, unit cylinder uncovering maintenance planning and the like.
Further, the unit operation mode adjustment and the unit operation parameter adjustment include: and the unit logic protection and parameter alarm are strictly executed, the phenomena of axial displacement increase, thrust tile temperature rise and pressure rise of the monitoring section occur, the unit load is timely reduced, and the steam inlet of the ventilation part of the unit is reduced. The unit steam-water system inspection comprises: the quality of steam and water supply of the unit is strictly checked, and the water quality problem is timely treated. The unit uncovering cylinder maintenance planning comprises the following steps: and (5) performing unit cylinder uncovering treatment preparation work in advance, and performing shot blasting treatment after preparing the unit cylinder uncovering.
In conclusion, the overhaul method for the turbine through-flow part conveniently and rapidly judges whether the turbine through-flow part is abnormal or not, and can timely start relevant adjustment measures after confirming that the through-flow part has a scaling phenomenon, slow down scaling rate, reduce the influence of scaling on unit efficiency and safety, carry out cylinder uncovering overhaul preparation in advance, and emphasize start of steam-water system inspection to solve the problem of a system, thereby ensuring safe, reliable and economic operation of other units.
Example 3
The invention also discloses a scaling judgment device of the turbine through-flow part, which comprises: the device comprises a processing module, an analysis module and a judgment module.
The processing module is used for establishing a data analysis model. The analysis module is connected with the processing module and used for obtaining a characteristic change curve of the through-flow part according to the data analysis model and obtaining a reference change curve of the through-flow part according to the data analysis model. And the judging module is connected with the analyzing module and is used for judging whether the scaling phenomenon occurs in the through-flow part according to the characteristic change curve and the reference change curve.
In this embodiment, the processing module includes an acquisition unit, a first calculation unit, a second calculation unit, a third calculation unit, and a fourth calculation unit.
The collecting unit is used for collecting the daily main water supply flow, main steam flow, monitoring section pressure, high-pressure exhaust steam pressure, monitoring section temperature, main water supply temperature, thrust bearing temperature, axial displacement and condensate flow of the through-flow part. The first calculation unit is connected with the acquisition unit and is used for calculating the difference value between the main water supply flow and the main steam flow of the through-flow part every day to obtain a first flow difference value. The second calculation unit is connected with the acquisition unit and is used for calculating the difference value between the high-pressure exhaust pressure and the monitoring section pressure of the ventilation part every day to obtain the pressure difference value of the ventilation part every day. And the third calculation unit is connected with the acquisition unit and is used for calculating the difference between the temperature of the monitoring section and the temperature of the main water supply to obtain the daily temperature difference of the ventilation part. And the fourth calculation unit is connected with the acquisition unit and is used for calculating the difference value between the daily condensate flow and the main water supply flow of the through flow part to obtain a second flow difference value.
Specifically, the processing module may employ an existing DCS controller.
In this embodiment, the analysis modules may be software modules on a computer device. The interface of the computer equipment is connected with the DCS controller, so that the main water supply flow, the main steam flow, the monitoring section pressure, the high-pressure steam exhaust pressure, the monitoring section temperature, the main water supply temperature, the thrust bearing temperature, the axial displacement and the condensate flow, as well as the first flow difference value, the second flow difference value, the pressure difference value and the temperature difference value which are output by the DCS controller can be obtained.
Specifically, the analysis module includes a first processing unit, a second processing unit, a third processing unit, a fourth processing unit, a fifth processing unit, a sixth processing unit, a seventh processing unit, and an eighth processing unit.
The first processing unit is connected with the processing module and is used for drawing a first flow difference value change curve of the turbine through-flow part according to the first flow difference value, namely a difference value change curve between the main steam flow of the through-flow part and the main water supply flow. And the second processing unit is connected with the processing module and is used for drawing a monitoring section pressure change curve of the ventilation part according to the monitoring section pressure. And the third processing unit is connected with the processing module and is used for drawing a pressure difference change curve of the ventilation part according to the pressure difference, namely, the difference change curve between the high-pressure exhaust pressure of the ventilation part and the pressure of the monitoring section. And the fourth processing unit is connected with the processing module and is used for drawing a temperature difference change curve of the through-flow part according to the temperature difference, namely, the difference change curve between the temperature of the monitoring section of the through-flow part and the temperature of the main water supply. And the fifth processing unit is connected with the processing module and is used for drawing a thrust bearing temperature change curve of the through-flow part according to the thrust bearing temperature. And the sixth processing unit is connected with the processing module and is used for drawing an axial displacement change curve of the through-flow part according to the axial displacement. And the seventh processing unit is connected with the processing module and is used for drawing a second flow difference value change curve of the through flow part according to the second flow difference value, namely a difference value change curve between the condensate flow of the through flow part and the main water supply flow. And the eighth processing unit is connected with the processing module and is used for drawing a regulating stage pressure change curve of the through-flow part according to the regulating stage pressure of the through-flow part so as to obtain a reference change curve.
In this embodiment, the judging module may also be a software module on the computer device, and the judging module is connected to the analyzing module.
Specifically, the judging module includes: the device comprises a first control unit, a linear fitting unit and a second control unit.
The first control unit is connected with the analysis module and is used for respectively verifying the correlation between the characteristic change curves and the reference change curve and acquiring the target characteristic change curve according to the correlation.
In addition, the linear fitting unit is connected with the first control unit and is used for carrying out scatter diagram analysis on the target characteristic change curve and carrying out linear fitting so as to obtain a linear fitting curve.
The second control unit is connected with the linear fitting unit and is used for judging whether scaling phenomenon occurs in the through-flow part according to the change trend of the linear fitting curve of all target characteristic change curves: if the linear fitting curve is in an ascending trend, judging that scaling phenomenon occurs in the through-flow part; if the linear fitting curve is in a leveling or descending trend, judging that the scaling phenomenon does not occur in the through-flow part.
Specifically, the working principle of the scaling judgment device of the turbine through-flow part is as follows: first, each item of data of the turbine through-flow part and each monitoring section is collected by a processing module. And then, based on the pressure of the regulating stage of the steam turbine, the analyzing module combines the data of the pressure of the regulating stage, the pressure of each monitoring stage, the main steam flow, the main water supply flow, the unit load and the like with the operation parameters of the whole ventilation part and the unit load and output, and classifies and sorts the data of each stage and the system through big data analysis to generate a plurality of characteristic change curves and reference change curves. After finishing data arrangement, comparing and analyzing the characteristic change curves of the same working condition, the same load, the same flow and the same time period with the reference change curve by a judging module, analyzing a scatter diagram of each characteristic change curve by a linear fitting method, and solving an R value (namely a correlation coefficient) between each characteristic change curve and the reference change curve. And determining the linear relation among the characteristic change curves according to the magnitude of the R value, and determining whether the characteristic change curves have reference values or not. And further determining the running condition of the through-flow part of the unit and whether scaling phenomenon exists.
In summary, the scaling judgment device for the turbine through-flow part has the following beneficial effects: the measuring principle is simple, the implementation is convenient, and the scaling phenomenon can be judged by collecting and measuring the operation data of the DCS controller of the steam turbine without additionally installing a sensor. Not only meets the daily data acquisition and measurement requirements; and the early warning of scaling faults of the through-flow part can be realized through data analysis and matching with an online monitoring system.
Example 4
The invention also discloses a maintenance system of the turbine through-flow part, which comprises: the judgment device of the turbine through-flow portion and the fouling treatment unit in example 3.
Wherein, the judgment device of the turbine through-flow part in embodiment 3 is used for judging whether the scaling phenomenon occurs in the through-flow part:
if the scaling phenomenon does not occur in the through-flow part, sending out an ending signal;
if the scaling phenomenon occurs in the through-flow part, sending a starting signal;
and the scaling treatment unit is connected with the judging device of the turbine through-flow part and is used for controlling the scaling treatment flow of the through-flow part to start when receiving a starting signal and controlling the scaling treatment flow of the through-flow part to end when receiving an ending signal.
The maintenance system of the turbine through-flow part can intuitively judge the running condition of the through-flow part of the steam turbine generator unit in the current running period. On the basis, the unit operation mode and the load belt connection mode can be adjusted through the scaling treatment unit, and water quality adjustment is matched, so that the scaling problem of the pre-controlled ventilation part is solved, the scaling rate is slowed down, and the unit operation risk is reduced.
In addition, after the scaling phenomenon occurs in the through-flow system of the unit, the data analysis and parameter adjustment can be further performed to prolong the running time of the unit, provide the preparation time for the cylinder uncovering maintenance, ensure the maintenance quality, prolong the average failure-free time and shorten the average repair time, reduce the shutdown, reduce the maintenance cost and improve the equipment utilization rate of the power generation equipment.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (14)
1. A method for determining fouling of a turbine bleed portion, comprising:
S1: establishing a data analysis model;
s2: according to the data analysis model, a characteristic change curve of a turbine through-flow part is obtained, and according to the data analysis model, a reference change curve of the through-flow part is obtained;
s3: judging whether scaling phenomenon occurs in the through-flow part according to the characteristic change curve and the reference change curve.
2. The method according to claim 1, wherein the step S1 specifically comprises:
collecting the daily main water supply flow, main steam flow, monitoring section pressure, high-pressure exhaust pressure, monitoring section temperature, main water supply temperature, thrust bearing temperature, axial displacement, condensate flow and regulating stage pressure of the through-flow part;
calculating the difference value between the main water supply flow and the main steam flow of each day of the ventilation part to obtain a first flow difference value;
calculating the difference value between the high-pressure exhaust pressure of the ventilation part and the pressure of the monitoring section every day to obtain the pressure difference value of the ventilation part every day;
calculating the difference value between the temperature of the monitoring section and the temperature of the main water supply to obtain the daily temperature difference value of the ventilation part;
calculating the difference value between the daily condensate flow and the main water supply flow of the through-flow part to obtain a second flow difference value;
The data are the data analysis model.
3. The method of claim 2, wherein the characteristic change curve comprises a plurality of: the method comprises the steps of a first flow difference value change curve of a turbine through-flow part, a monitoring section pressure change curve of the through-flow part, a pressure difference value change curve of the through-flow part, a temperature difference value change curve of the through-flow part, a thrust bearing temperature change curve of the through-flow part, an axial displacement change curve of the through-flow part and a second flow difference value change curve of the through-flow part.
4. A method according to claim 3, wherein in the step S2, a characteristic change curve of the through-flow portion is obtained according to the data analysis model, and the method specifically includes:
drawing a first flow difference value change curve of the turbine through-flow part according to the first flow difference value, namely a difference value change curve between the main steam flow and the main water supply flow of the through-flow part;
drawing a monitoring section pressure change curve of the through-flow part according to the monitoring section pressure;
according to the pressure difference, a pressure difference change curve of the ventilation part is drawn, namely, a difference change curve between the high-pressure exhaust pressure of the ventilation part and the pressure of the monitoring section;
Drawing a temperature difference change curve of the through-flow part according to the temperature difference, namely a difference change curve between the temperature of the monitoring section of the through-flow part and the temperature of main water supply;
drawing a thrust bearing temperature change curve of the through-flow part according to the thrust bearing temperature;
drawing an axial displacement change curve of the through-flow part according to the axial displacement;
and drawing a second flow difference value change curve of the through-flow part according to the second flow difference value, namely a difference value change curve between the condensate flow of the through-flow part and the main water supply flow.
5. The method according to claim 4, wherein in the step S2, a reference change curve of the through-flow portion is obtained according to the data analysis model, and the method specifically includes:
and drawing a regulating stage pressure change curve of the through-flow part according to the regulating stage pressure of the through-flow part, thereby obtaining the reference change curve.
6. The method according to claim 5, wherein the step S3 specifically includes:
respectively verifying the correlation between a plurality of characteristic change curves and the reference change curve, and acquiring a target characteristic change curve according to the correlation;
Carrying out scatter diagram analysis on the target characteristic change curve, and carrying out linear fitting to obtain a linear fitting curve;
judging whether scaling phenomenon occurs in the through-flow part according to the change trend of the linear fitting curve of all target characteristic change curves:
if the linear fitting curve is in an ascending trend, judging that scaling phenomenon occurs in the through-flow part;
and if the linear fitting curve is in a leveling or descending trend, judging that the scaling phenomenon does not occur in the through-flow part.
7. The method of claim 6, wherein each of said plurality of said characteristic curves is verified for correlation with said reference curve and a target characteristic curve is obtained therefrom, comprising the steps of:
calculating correlation coefficients of the characteristic change curve and the reference change curve respectively;
and judging the correlation of other characteristic change curves by taking the correlation coefficient between the difference change curve between the main steam flow and the main water supply flow of the through flow part and the reference change curve as a reference coefficient:
when the correlation coefficient of other characteristic change curves is larger than or equal to the reference coefficient, judging that the characteristic change curve has correlation with a reference change curve;
When the correlation coefficient of other characteristic change curves is smaller than the reference coefficient, judging that the characteristic change curve and the reference change curve have no correlation;
if the characteristic change curve has correlation with the reference change curve, the characteristic change curve is considered as a reference for judging whether scaling phenomenon occurs in the through-flow part, namely, the characteristic change curve is a target characteristic change curve;
and if the characteristic change curve and the characteristic change curve have no correlation, excluding the reference.
8. The maintenance method of the turbine through-flow part is characterized by comprising the following steps:
the method for determining scaling of a turbine through-flow portion according to any one of claims 1 to 7, determining whether scaling phenomenon occurs in the through-flow portion;
and if the scaling phenomenon does not occur in the through-flow part, determining that the through-flow part operates normally.
9. The method of claim 8, wherein if it is determined that the fouling phenomenon occurs in the through-flow portion, the fouling treatment process of the through-flow portion is started to repair the through-flow portion, and,
the method for judging the scaling of the through-flow portion of a steam turbine according to any one of claims 1 to 7, further judging whether the scaling phenomenon occurs in the through-flow portion after maintenance, and circulating in this way until the scaling phenomenon of the through-flow portion is eliminated.
10. A fouling judgment device for a turbine through-flow section, comprising: the device comprises a processing module, an analysis module and a judgment module;
the processing module is used for establishing a data analysis model;
the analysis module is connected with the processing module and is used for obtaining a characteristic change curve of the through-flow part according to the data analysis model and obtaining a reference change curve of the through-flow part according to the data analysis model;
the judging module is connected with the analyzing module and is used for judging whether the scaling phenomenon occurs in the through-flow part according to the characteristic change curve and the reference change curve.
11. The apparatus of claim 10, wherein the processing module comprises an acquisition unit and first, second, third, and fourth computing units,
the acquisition unit is used for acquiring the daily main water supply flow, main steam flow, monitoring section pressure, high-pressure steam exhaust pressure, monitoring section temperature, main water supply temperature, thrust bearing temperature, axial displacement and condensate flow of the through-flow part,
the first calculation unit is connected with the acquisition unit and is used for calculating the difference value between the main water supply flow and the main steam flow of the through-flow part every day to obtain a first flow difference value;
The second calculation unit is connected with the acquisition unit and is used for calculating the difference value between the pressure of the high-pressure exhaust steam and the pressure of the monitoring section of the ventilation part every day to obtain the pressure difference value of the ventilation part every day;
the third calculation unit is connected with the acquisition unit and is used for calculating the difference value between the temperature of the monitoring section and the temperature of the main water supply to obtain the daily temperature difference value of the ventilation part;
the fourth calculation unit is connected with the acquisition unit and is used for calculating the difference value between the daily condensate flow and the main water supply flow of the through flow part to obtain a second flow difference value.
12. The apparatus of claim 11, wherein the analysis module comprises a first processing unit, a second processing unit, a third processing unit, a fourth processing unit, a fifth processing unit, a sixth processing unit, a seventh processing unit, and an eighth processing unit;
the first processing unit is connected with the processing module and is used for drawing a first flow difference value change curve of the turbine through-flow part according to the first flow difference value, namely a difference value change curve between the main steam flow and the main water supply flow of the through-flow part;
The second processing unit is connected with the processing module and is used for drawing a monitoring section pressure change curve of the ventilation part according to the monitoring section pressure;
the third processing unit is connected with the processing module and is used for drawing a pressure difference change curve of the ventilation part according to the pressure difference, namely a difference change curve between the high-pressure exhaust pressure of the ventilation part and the pressure of the monitoring section;
the fourth processing unit is connected with the processing module and is used for drawing a temperature difference change curve of the through-flow part according to the temperature difference, namely a difference change curve between the temperature of the monitoring section of the through-flow part and the temperature of main water supply;
the fifth processing unit is connected with the processing module and is used for drawing a thrust bearing temperature change curve of the ventilation part according to the thrust bearing temperature;
the sixth processing unit is connected with the processing module and is used for drawing an axial displacement change curve of the ventilation part according to the axial displacement;
the seventh processing unit is connected with the processing module and is used for drawing a second flow difference value change curve of the through-flow part according to the second flow difference value, namely a difference value change curve between the condensate flow of the through-flow part and the main water supply flow;
And the eighth processing unit is connected with the processing module and is used for drawing a regulating stage pressure change curve of the through-flow part according to the regulating stage pressure of the through-flow part so as to obtain the reference change curve.
13. The apparatus of claim 12, wherein the determining module comprises: the linear fitting unit is used for generating linear fitting signals according to the first control unit;
the first control unit is connected with the analysis module and used for respectively verifying the correlation between the characteristic change curves and the reference change curve and acquiring a target characteristic change curve according to the correlation;
the linear fitting unit is connected with the first control unit and is used for carrying out scatter diagram analysis on the target characteristic change curve and carrying out linear fitting so as to obtain a linear fitting curve;
the second control unit is connected with the linear fitting unit and is used for judging whether scaling phenomenon occurs in the through-flow part according to the change trend of the linear fitting curve of all target characteristic change curves:
if the linear fitting curve is in an ascending trend, judging that scaling phenomenon occurs in the through-flow part;
and if the linear fitting curve is in a leveling or descending trend, judging that the scaling phenomenon does not occur in the through-flow part.
14. A service system for a turbine bleed portion, comprising: a fouling judgment device and a fouling treatment unit for a through-flow section of a steam turbine according to any one of claims 10 to 13;
the judging device of the turbine through-flow part is used for judging whether the through-flow part has scaling phenomenon or not:
if the through-flow part is judged to not have the scaling phenomenon, an ending signal is sent out;
if the scaling phenomenon of the through-flow part is judged, a starting signal is sent out;
the scaling treatment unit is connected with the judging device of the turbine through-flow part and is used for controlling the scaling treatment flow of the through-flow part to start when receiving a starting signal and controlling the scaling treatment flow of the through-flow part to end when receiving an ending signal.
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| CN202310638305.4A CN116701908A (en) | 2023-05-31 | 2023-05-31 | Method and device for judging scaling of turbine through-flow part, overhauling method and system |
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