CN112085353A - Boiler low-load stable combustion capability evaluation method based on degradation degree analysis - Google Patents
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Abstract
The invention belongs to the technical field of evaluation of low-load operation capability of a coal-fired boiler unit, and particularly relates to a method for evaluating low-load stable combustion capability of a boiler based on degradation degree analysis, which comprises the following steps: preprocessing the online data; step two: establishing a boiler low-load combustion numerical simulation model, and analyzing and obtaining key parameters and weight characteristics influencing combustion stability; step three: verifying the effectiveness of key parameters and weight characteristics influencing combustion stability through a low-load combustion stabilizing test; step four: analyzing the composition factors influencing the low-load stable combustion capacity of the boiler, layering the parameters according to the factor correlation, and constructing a hierarchical structure model; step five: the method has the advantages that the relative importance ratios among the parameters are determined, the judgment matrix of each level is constructed, the structure is reasonable, the mathematical statistics algorithm is utilized to screen, clean, filter and mine the data of the power plant, the invalid data is subjected to numerical reconstruction, the effectiveness and the utilization rate of the data of the power plant are improved, and the data value potential is improved.
Description
Technical Field
The invention relates to the technical field of evaluation of low-load operation capability of a coal-fired boiler unit, in particular to a method for evaluating low-load stable combustion capability of a boiler based on degradation degree analysis.
Background
With the implementation of the low-carbon economic development strategy in China, the new energy power generation technology is greatly developed, and the proportion of new energy in a power grid is increased day by day. Due to discontinuity of new energy power generation and structural characteristics of a power grid in China, a peak regulation technology of a thermal power generating unit is important day by day. The low-load stable combustion capability of the boiler is a key factor for restricting peak regulation of a thermal power generating unit, the minimum output characteristic of the unit is obtained through a low-load stable combustion test of the boiler under a common condition, however, in order to reduce the power generation cost, uncertain poor-quality coal is widely mixed and combusted in each thermal power enterprise, so that the minimum stable combustion capability of the boiler is greatly influenced, the minimum stable combustion capability of the unit cannot be accurately mastered in time by power plant enterprises, and great difficulty is brought to peak regulation of a power grid and new energy consumption. Therefore, the invention provides a boiler low-load stable combustion capability evaluation method based on degradation degree analysis, which fully combines boiler combustion numerical simulation characteristics and low-load stable combustion test data, utilizes an analytic hierarchy process and a system evaluation principle to construct a low-load stable combustion capability evaluation model based on degradation degree analysis, realizes real-time quantitative evaluation and unstable factor tracing of boiler low-load stable operation capability, and has important guiding significance for improving peak regulation capability of a thermal power generating unit and promoting new energy consumption.
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.
Therefore, the invention aims to provide a boiler low-load stable combustion capability evaluation method based on degradation degree analysis, which is based on cleaning and reconstruction of online operation data in a power plant Distributed Control System (DCS) and a plant-level real-time database system (RTDB), analyzes and obtains composition factors influencing the boiler low-load stable combustion capability by using an Analytic Hierarchy Process (AHP) and combining boiler combustion numerical simulation characteristics, low-load stable combustion test data and expert knowledge, and hierarchically forms a three-layer structure model according to the interrelation among the factors. And carrying out simulation analysis on key parameters and weights influencing combustion stability through a boiler low-load combustion numerical value, and carrying out reliability verification on the key parameters by using a low-load stable combustion test technology. And determining the relative importance ratio of each index factor according to hierarchical analysis, constructing a judgment matrix of each hierarchy, and finally obtaining the weight coefficient of the low-level factor to the high level by solving the feature vector after the maximum feature value corresponds to normalization. Based on a system evaluation principle, the system stability has correlation with the index change of each subsystem and the operation parameters, a parameter change threshold range is selected according to numerical simulation and field test, a degradation degree concept is introduced, the abnormal parameter degradation condition of the degradation range between [0 and 1] is calculated, and the rationality of the operation parameters is represented. When the degradation degree tends to 0, the explanation parameter is closer to a stable normal state, and when the degradation degree tends to 1, the explanation parameter is further from the normal state, and the unit stability is deteriorated. And considering the weight coefficient of the parameters to the system target, calculating the stability degradation degree index of the boiler low-load operation by integrating the degradation degree of each parameter, considering the characteristics of each subsystem and the parameter, and evaluating the stable combustion capacity of the boiler low-load on line by using the system degradation degree index. Meanwhile, according to the parameter degradation degree sequence considering the weight, subsystems and factors which cause instability of the low load of the boiler are traced, the combustion influence indexes are evaluated qualitatively, the parameter influence degree is evaluated quantitatively, and analysis guidance is provided for improving the low-load stable combustion capacity of the unit.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a boiler low-load stable combustion capacity evaluation method based on degradation degree analysis comprises the following steps:
the method comprises the following steps: preprocessing the online data;
step two: establishing a boiler low-load combustion numerical simulation model, and analyzing and obtaining key parameters and weight characteristics influencing combustion stability;
step three: verifying the effectiveness of key parameters and weight characteristics influencing combustion stability through a low-load combustion stabilizing test;
step four: analyzing the composition factors influencing the low-load stable combustion capacity of the boiler, layering the parameters according to the factor correlation, and constructing a hierarchical structure model;
step five: determining relative importance ratios among the parameters, constructing a judgment matrix of each layer, and obtaining a weight coefficient of the most-layer factor to the high layer;
step six: according to a parameter threshold range selected by numerical simulation and field test, introducing a degradation degree concept, calculating a parameter degradation condition with a degradation range between [0 and 1], and representing the rationality of an operation parameter;
step seven: considering the parameter weight coefficient, calculating the stability degradation degree index of the low-load operation of the boiler by integrating the degradation degree of each parameter, and evaluating the low-load stable combustion capacity of the boiler on line;
step eight: and tracing subsystems and factors causing instability of the low load of the boiler according to the parameter degradation degree, and providing guidance for improving the low-load stable combustion capability of the unit.
As a preferable scheme of the boiler low-load stable combustion capacity evaluation method based on the degradation degree analysis, the method comprises the following steps: the sources of the online data comprise a power plant distributed control system and a plant-level real-time database system.
As a preferable scheme of the boiler low-load stable combustion capacity evaluation method based on the degradation degree analysis, the method comprises the following steps: the online data is preprocessed, namely, consistency check, data cleaning, bad value elimination and reconstruction are carried out on online operation data, and normalization processing is carried out.
As a preferable scheme of the boiler low-load stable combustion capacity evaluation method based on the degradation degree analysis, the method comprises the following steps: and establishing a boiler low-load combustion numerical simulation model, and analyzing and obtaining key parameters and weight characteristics influencing combustion stability through simulation calculation.
As a preferable scheme of the boiler low-load stable combustion capacity evaluation method based on the degradation degree analysis, the method comprises the following steps: and verifying the validity of key parameters influencing combustion stability and weight characteristics through a low-load combustion stabilizing test, and correspondingly adjusting the existing deviation.
As a preferable scheme of the boiler low-load stable combustion capacity evaluation method based on the degradation degree analysis, the method comprises the following steps: and analyzing the composition factors influencing the low-load stable combustion capacity of the boiler by using an analytic hierarchy process, layering the parameters according to the factor correlation, and constructing a three-layer structure evaluation model.
As a preferable scheme of the boiler low-load stable combustion capacity evaluation method based on the degradation degree analysis, the method comprises the following steps: and determining the relative importance ratio of the parameters by combining numerical simulation calculation and test results, constructing a judgment matrix of each level, and finally obtaining the weight coefficient of the low-level factors to the high level by solving the eigenvector after the maximum eigenvalue corresponds to normalization.
As a preferable scheme of the boiler low-load stable combustion capacity evaluation method based on the degradation degree analysis, the method comprises the following steps: based on a system evaluation principle, the system stability has correlation with the index change of each subsystem and operation parameters, each parameter threshold range is selected according to numerical simulation and field test, a degradation degree concept is introduced, the parameter degradation condition of the degradation range between [0 and 1] is calculated, and the rationality of the operation parameters is represented. When the degradation degree tends to 0, the explanation parameter is closer to a stable normal state, and when the degradation degree tends to 1, the explanation parameter is further from the normal state, and the unit stability is deteriorated.
As a preferable scheme of the boiler low-load stable combustion capacity evaluation method based on the degradation degree analysis, the method comprises the following steps: and considering the weight coefficient of the parameters to the system target, calculating the stability degradation degree index of the low-load operation of the boiler by integrating the degradation degree of each parameter, and evaluating the low-load stable combustion capability of the boiler on line.
As a preferable scheme of the boiler low-load stable combustion capacity evaluation method based on the degradation degree analysis, the method comprises the following steps: and sequencing according to the parameter degradation degree considering the weight, tracing subsystems and factors causing instability of the low load of the boiler, and providing guidance for improving the low-load stable combustion capability of the unit.
Compared with the prior art, the invention has the beneficial effects that:
1. the data of the power plant are screened, cleaned, filtered and mined by using a mathematical statistical algorithm, invalid data are subjected to numerical reconstruction, the effectiveness and the utilization rate of the data of the power plant are improved, and the data value potential is improved.
2. Based on a system evaluation principle and an analytic hierarchy process, professional data and expert knowledge formed by numerical simulation and a low-load stable combustion test are fully utilized, a multi-level multi-factor low-load stable combustion capability comprehensive evaluation model is constructed, influences caused by unknown coal types are avoided, and scientific accuracy of evaluation indexes is guaranteed.
3. An index evaluation system is constructed based on degradation degree analysis, boiler stable combustion capacity is evaluated quantitatively, parameters influencing boiler stable combustion level are analyzed qualitatively, and influence degree is analyzed quantitatively, so that clear basis is provided for operators to evaluate low-load operation capacity of the boiler on line, and unit stable combustion level is improved
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments, 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 without inventive exercise. Wherein:
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic structural diagram of a three-layer structure evaluation model of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
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 herein, and it will be apparent to those of ordinary skill in the art that the present invention may be practiced without departing from the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein for convenience of illustration, the cross-sectional view of the device structure is not enlarged partially according to the general scale, and the drawings are only examples, 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.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides the following technical scheme: a boiler low-load stable combustion capacity evaluation method based on degradation degree analysis comprises the following steps:
s1: and preprocessing the online data.
Data from a power plant distributed control system can cause incorrect measurement results due to the problems of unreasonable parameter measurement positions, measurement point faults, abnormal internal mapping and the like, and finally the effectiveness of the model is influenced. Therefore, it is necessary to perform data consistency check and cleaning on the source data and reconstruct error data.
S2: and establishing a boiler low-load combustion numerical simulation model, and analyzing and obtaining key parameters and weight characteristics influencing combustion stability.
Boiler combustion is a complex physical and chemical comprehensive reaction process, and parameters influencing combustion stability are numerous, so that a fluid calculation tool is used for modeling and simulating a boiler low-load combustion process, and key parameters and weight characteristics influencing boiler low-load operation are obtained theoretically through variable working condition and variable parameter calculation.
S3: and verifying the effectiveness of the key parameters and the weight characteristics influencing the combustion stability through a low-load combustion stabilizing test.
The theoretical simulation calculation result is often deviated from the actual result, so that the theoretical calculation result needs to be verified and corrected through a low-load combustion stabilizing test by using a single-factor test method, and the representativeness and the effectiveness of the key parameters and the weight characteristics are ensured.
S4: and analyzing the composition factors influencing the low-load stable combustion capacity of the boiler, and layering the parameters according to the factor correlation to form a hierarchical structure model.
Analyzing the composition factors influencing the low-load stable combustion capability of the boiler by utilizing an analytic hierarchy process and combining the boiler combustion numerical simulation characteristic and the low-load stable combustion test data, and constructing a three-layer structure evaluation model by parameter layering, wherein the three-layer structure evaluation model comprises a target layer, a criterion layer and a scheme layer from top to bottom.
S5: and determining the relative importance ratio of the parameters, constructing a judgment matrix of each layer, and obtaining the weight coefficient of the low-layer factor to the upper layer.
Combining the boiler combustion numerical simulation characteristic and the low-load stable combustion test data with expert knowledge, constructing judgment matrixes layer by layer according to the weight influencing the stability of the system, and finally obtaining the weight coefficient of the lowest-level factor to the highest layer by solving the eigenvector after the normalization corresponding to the maximum eigenvalue, wherein P1 is the judgment matrix of the second layer, W1 is the weight coefficient vector of the second layer, and the specific formula is as follows.
W1＝(0.24,0.25,0.12,...0.14)TExample of vector of second-layer weight coefficient
S6: according to a parameter threshold range selected by numerical simulation and field test, introducing a degradation degree concept, calculating the parameter degradation condition of the degradation range between [0 and 1], and representing the rationality of the operation parameters.
The combustion stability of the boiler is gradually reduced along with the reduction of the load of the unit, the operation parameters representing the combustion stability can gradually deviate from a normal state, and a certain degradation trend exists. When the parameter change exceeds the normal threshold value and is in a degradation range, introducing the concept of degradation degree, and calculating the degradation condition of the abnormal parameter, wherein the degradation range is between [0 and 1 ]. When the deterioration degree tends to 0, the more the description parameter approaches the normal state; when the degradation degree tends to 1, the more the explanation parameter deviates from the normal state, the worse the stability of the unit is, and the shutdown risk exists, and the degradation degree function is as follows.
Wherein:
m is the number of subsystems influencing combustion stability;
n is the number of key parameters influencing the combustion stability;
xij is the measured value of the jth key parameter of the ith subsystem;
wi is the weight of the influence of the ith subsystem on the low-load stability of the boiler;
wj is the influence weight of the jth key parameter on the stability of the subsystem;
xijmin is the minimum threshold value of the jth key parameter of the ith subsystem;
xijmax, the maximum threshold for the jth key parameter for the ith subsystem.
S7: and considering the parameter weight coefficient, calculating the stability degradation degree index of the low-load operation of the boiler by integrating the degradation degree of each parameter, and evaluating the low-load stable combustion capacity of the boiler on line.
And (4) calculating the stability degradation index of the low-load operation of the boiler by integrating the degradation degree of each system parameter, and evaluating the low-load stable combustion capability of the boiler.
S8: and tracing subsystems and factors causing instability of the low load of the boiler according to the parameter degradation degree, and providing guidance for improving the low-load stable combustion capability of the unit.
The method is based on online operation data in a power plant Distributed Control System (DCS) and a plant-level real-time database system (RTDB) to carry out cleaning and reconstruction, a composition factor influencing the low-load stable combustion capacity of the boiler is obtained through analysis by utilizing an Analytic Hierarchy Process (AHP) and combining boiler combustion numerical simulation characteristics and low-load stable combustion test data and expert knowledge, and the factor is layered according to the interrelation among the factors to form a three-layer structure model. And carrying out simulation analysis on key parameters and weights influencing combustion stability through a boiler low-load combustion numerical value, and carrying out reliability verification on the key parameters by using a low-load stable combustion test technology. And determining the relative importance ratio of each index factor according to hierarchical analysis, constructing a judgment matrix of each hierarchy, and finally obtaining the weight coefficient of the low-level factor to the high level by solving the feature vector after the maximum feature value corresponds to normalization. Based on a system evaluation principle, the system stability has correlation with the index change of each subsystem and the operation parameters, a parameter change threshold range is selected according to numerical simulation and field test, a degradation degree concept is introduced, the abnormal parameter degradation condition of the degradation range between [0 and 1] is calculated, and the rationality of the operation parameters is represented. When the degradation degree tends to 0, the explanation parameter is closer to a stable normal state, and when the degradation degree tends to 1, the explanation parameter is further from the normal state, and the unit stability is deteriorated. And considering the weight coefficient of the parameters to the system target, calculating the stability degradation degree index of the boiler low-load operation by integrating the degradation degree of each parameter, considering the characteristics of each subsystem and the parameter, and evaluating the stable combustion capacity of the boiler low-load on line by using the system degradation degree index. Meanwhile, according to the parameter degradation degree sequence considering the weight, subsystems and factors which cause instability of the low load of the boiler are traced, the combustion influence indexes are evaluated qualitatively, the parameter influence degree is evaluated quantitatively, and analysis guidance is provided for improving the low-load stable combustion capacity of the unit.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A boiler low-load stable combustion capability evaluation method based on degradation degree analysis is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: preprocessing the online data;
step two: establishing a boiler low-load combustion numerical simulation model, and analyzing and obtaining key parameters and weight characteristics influencing combustion stability;
step three: verifying the effectiveness of key parameters and weight characteristics influencing combustion stability through a low-load combustion stabilizing test;
step four: analyzing the composition factors influencing the low-load stable combustion capacity of the boiler, layering the parameters according to the factor correlation, and constructing a hierarchical structure model;
step five: determining relative importance ratios among the parameters, constructing a judgment matrix of each layer, and obtaining a weight coefficient of the most-layer factor to the high layer;
step six: according to a parameter threshold range selected by numerical simulation and field test, introducing a degradation degree concept, calculating a parameter degradation condition with a degradation range between [0 and 1], and representing the rationality of an operation parameter;
step seven: considering the parameter weight coefficient, calculating the stability degradation degree index of the low-load operation of the boiler by integrating the degradation degree of each parameter, and evaluating the low-load stable combustion capacity of the boiler on line;
step eight: and tracing subsystems and factors causing instability of the low load of the boiler according to the parameter degradation degree, and providing guidance for improving the low-load stable combustion capability of the unit.
2. The method for evaluating the low-load stable combustion capacity of the boiler based on the degradation degree analysis is characterized by comprising the following steps of: the sources of the online data comprise a power plant distributed control system and a plant-level real-time database system.
3. The method for evaluating the low-load stable combustion capacity of the boiler based on the degradation degree analysis is characterized by comprising the following steps of: the online data is preprocessed, namely, consistency check, data cleaning, bad value elimination and reconstruction are carried out on online operation data, and normalization processing is carried out.
4. The method for evaluating the low-load stable combustion capacity of the boiler based on the degradation degree analysis is characterized by comprising the following steps of: and establishing a boiler low-load combustion numerical simulation model, and analyzing and obtaining key parameters and weight characteristics influencing combustion stability through simulation calculation.
5. The method for evaluating the low-load stable combustion capacity of the boiler based on the degradation degree analysis is characterized by comprising the following steps of: and verifying the validity of key parameters influencing combustion stability and weight characteristics through a low-load combustion stabilizing test, and correspondingly adjusting the existing deviation.
6. The method for evaluating the low-load stable combustion capacity of the boiler based on the degradation degree analysis is characterized by comprising the following steps of: and analyzing the composition factors influencing the low-load stable combustion capacity of the boiler by using an analytic hierarchy process, layering the parameters according to the factor correlation, and constructing a three-layer structure evaluation model.
7. The method for evaluating the low-load stable combustion capacity of the boiler based on the degradation degree analysis is characterized by comprising the following steps of: and determining the relative importance ratio of the parameters by combining numerical simulation calculation and test results, constructing a judgment matrix of each level, and finally obtaining the weight coefficient of the low-level factors to the high level by solving the eigenvector after the maximum eigenvalue corresponds to normalization.
8. The method for evaluating the low-load stable combustion capacity of the boiler based on the degradation degree analysis is characterized by comprising the following steps of: based on a system evaluation principle, the system stability has correlation with the index change of each subsystem and operation parameters, each parameter threshold range is selected according to numerical simulation and field test, a degradation degree concept is introduced, the parameter degradation condition of the degradation range between [0 and 1] is calculated, and the rationality of the operation parameters is represented. When the degradation degree tends to 0, the explanation parameter is closer to a stable normal state, and when the degradation degree tends to 1, the explanation parameter is further from the normal state, and the unit stability is deteriorated.
9. The method for evaluating the low-load stable combustion capacity of the boiler based on the degradation degree analysis is characterized by comprising the following steps of: and considering the weight coefficient of the parameters to the system target, calculating the stability degradation degree index of the low-load operation of the boiler by integrating the degradation degree of each parameter, and evaluating the low-load stable combustion capability of the boiler on line.
10. The method for evaluating the low-load stable combustion capacity of the boiler based on the degradation degree analysis is characterized by comprising the following steps of: and sequencing according to the parameter degradation degree considering the weight, tracing subsystems and factors causing instability of the low load of the boiler, and providing guidance for improving the low-load stable combustion capability of the unit.
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| CN116339134A (en) * | 2022-12-30 | 2023-06-27 | 华能国际电力股份有限公司德州电厂 | Frequency modulation optimization control system of large-disturbance thermal power generating unit |
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