Method and device for monitoring air leakage rate of air preheater, storage medium and equipment

Abstract

The invention relates to a monitoring method and device for the air leakage rate of an air preheater, a storage medium, electronic equipment and a computer program product. The method comprises the following steps: acquiring initial inlet flue gas oxygen content data of at least three measuring points of an inlet flue of the air preheater, initial outlet flue gas oxygen content data of at least three measuring points of an outlet flue of the air preheater and current unit load data in a current scene; in response to the situation that the current scene meets the monitoring condition based on the current unit load data, the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data are determined as effective data; and determining the air leakage rate of the air preheater according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data. On the basis of realizing automatic monitoring of the air leakage rate of the air preheater, the monitoring frequency of the air leakage rate of the air preheater is improved, so that the monitoring requirement of the air leakage rate of the air preheater is met.

Description

Technical Field

[0001] The present disclosure relates to the technical field of boiler energy-saving equipment, and in particular, to a method for monitoring an air preheater leakage rate, an air preheater leakage rate monitoring device, a non-temporary computer-readable storage medium, an electronic device, and a computer program product. Background Art

[0002] Air preheater is a preheating device in thermal power plants that improves boiler heat exchange performance and reduces heat loss. Its function is to transfer the heat carried by the flue gas discharged from the tail flue of the boiler to the air before entering the boiler through the heat sink to preheat the air to a certain temperature. Since the air leakage rate of the air preheater will affect the economy and reliability of the entire unit, how to increase the monitoring frequency of the air preheater leakage rate to meet the monitoring needs of the air preheater leakage rate is an issue that power plants need to focus on.

[0003] In the related art, the air leakage rate of the air preheater is mainly monitored manually and regularly by relevant personnel carrying special equipment. If a high monitoring frequency is to be ensured, a high intensity of human labor is required. Summary of the invention

[0004] The purpose of the present invention is to provide a method for monitoring the air leakage rate of an air preheater, aiming to improve the monitoring frequency of the air leakage rate of the air preheater on the basis of realizing automatic monitoring of the air leakage rate of the air preheater, so as to meet the monitoring needs of the air leakage rate of the air preheater.

[0005] In order to achieve the above object, the present disclosure provides a method for monitoring the air leakage rate of an air preheater, the method comprising:

[0006] Obtain the initial inlet flue gas oxygen content data of at least three measuring points of the air preheater inlet flue, the initial outlet flue gas oxygen content data of at least three measuring points of the air preheater outlet flue and the current unit load data in the current scenario;

[0007] In response to determining that the current scenario meets a monitoring condition based on the current unit load data, determining that the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data are valid data;

[0008] The air preheater leakage rate is determined according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data.

[0009] Optionally, when the current unit load data is greater than or equal to a preset proportion of the unit rated load, and the duration of the unit rated load being greater than or equal to the preset proportion is greater than or equal to a preset duration, it is determined that the current scenario meets the monitoring condition.

[0010] Optionally, determining the air preheater leakage rate according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data includes:

[0011] Determining a target inlet flue gas oxygen content of the air preheater inlet flue according to the initial inlet flue gas oxygen content data, and determining a target outlet flue gas oxygen content of the air preheater outlet flue according to the initial outlet flue gas oxygen content data;

[0012] Determine a first excess air coefficient at an air preheater inlet according to the target inlet flue gas oxygen content, and determine a second excess air coefficient at an air preheater outlet according to the target outlet flue gas oxygen content;

[0013] Obtaining an air leakage coefficient according to a difference between the first excess air coefficient and the second excess air coefficient;

[0014] The air preheater leakage rate is determined according to the air leakage coefficient and the first excess air coefficient.

[0015] Optionally, the initial inlet flue gas oxygen content data at least includes first inlet flue gas oxygen content data at a first measuring point, second inlet flue gas oxygen content data at a second measuring point, and third inlet flue gas oxygen content data at a third measuring point, and determining the target inlet flue gas oxygen content of the air preheater inlet flue according to the initial inlet flue gas oxygen content data includes:

[0016] Determine the average value of the first inlet smoke oxygen content data, the second inlet smoke oxygen content data and the third inlet smoke oxygen content data to obtain average inlet smoke oxygen content data;

[0017] The weighted average value of the average inlet flue gas oxygen content data is determined within the duration that the current unit load data is greater than or equal to a preset proportion of the unit rated load to obtain the target inlet flue gas oxygen content.

[0018] Optionally, determining a weighted average of the average inlet flue gas oxygen content data within the duration to obtain the target inlet flue gas oxygen content includes:

[0019] The target inlet flue gas oxygen content is obtained according to the following formula:

[0020]

[0021] Wherein, a is the target inlet flue gas oxygen content; is the average inlet flue gas oxygen content data; a 1 is the oxygen content data of the first inlet flue gas; 2 is the oxygen content data of the second inlet flue gas;3 is the oxygen content data of the flue gas at the third inlet; 0 is the starting time point when the current unit load data is greater than or equal to the preset ratio of the unit rated load; t 1 It is the end time point when the current unit load data is greater than or equal to the preset proportion of the unit rated load.

[0022] Optionally, the initial outlet flue gas oxygen content data at least includes first outlet flue gas oxygen content data at a fourth measuring point, second outlet flue gas oxygen content data at a fifth measuring point, and third outlet flue gas oxygen content data at a sixth measuring point, and determining the target outlet flue gas oxygen content of the air preheater outlet flue according to the initial outlet flue gas oxygen content data includes:

[0023] Determine an average value of the first outlet flue gas oxygen content data, the second outlet flue gas oxygen content data, and the third outlet flue gas oxygen content data to obtain average outlet flue gas oxygen content data;

[0024] The weighted average value of the average outlet flue gas oxygen content data is determined within the duration that the current unit load data is greater than or equal to a preset proportion of the unit rated load to obtain the target outlet flue gas oxygen content.

[0025] Optionally, determining a weighted average of the average outlet flue gas oxygen content data within the duration to obtain the target outlet flue gas oxygen content includes:

[0026] The target outlet flue gas oxygen content is obtained according to the following formula:

[0027]

[0028] Wherein, b is the target outlet flue gas oxygen content; is the average outlet flue gas oxygen content data; b 1 b is the oxygen content data of the first outlet flue gas; 2 is the oxygen content data of the second outlet flue gas; b 3 is the oxygen content data of the flue gas at the third outlet; 0 is the starting time point when the current unit load data is greater than or equal to the preset ratio of the unit rated load; t 1 It is the end time point when the current unit load data is greater than or equal to the preset proportion of the unit rated load.

[0029] Optionally, determining the air preheater leakage rate according to the air leakage coefficient and the first excess air coefficient includes:

[0030] The air preheater leakage rate is determined according to the ratio of the air leakage coefficient to the first excess air coefficient.

[0031] Optionally, determining the air preheater leakage rate according to the ratio of the air leakage coefficient to the first excess air coefficient includes:

[0032] The air preheater leakage rate is determined according to the following formula:

[0033]

[0034] Among them, A L is the air preheater leakage rate; Δα is the leakage coefficient; α' is the first excess air coefficient.

[0035] Optionally, determining a first excess air coefficient at an air preheater inlet according to the target inlet flue gas oxygen content, and determining a second excess air coefficient at an air preheater outlet according to the target outlet flue gas oxygen content, comprises:

[0036] The first excess air coefficient and the second excess air coefficient are determined according to the following formula:

[0037]

[0038] Wherein, α' is the first excess air coefficient, α" is the second excess air coefficient; a is the target inlet flue gas oxygen content; b is the target outlet flue gas oxygen content.

[0039] In order to achieve the above object, the present disclosure also provides a monitoring device for air leakage rate of an air preheater, comprising:

[0040] A data monitoring module is used to obtain the initial inlet flue gas oxygen content data of at least three measuring points of the air preheater inlet flue, the initial outlet flue gas oxygen content data of at least three measuring points of the air preheater outlet flue and the current unit load data in the current scenario;

[0041] A valid data determination module, configured to determine that the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data are valid data in response to determining that the current scene meets the monitoring condition based on the current unit load data;

[0042] The air preheater air leakage rate calculation module is used to determine the air preheater air leakage rate according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data.

[0043] In order to achieve the above-mentioned purpose, the present disclosure also provides a non-temporary computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for monitoring the air leakage rate of an air preheater provided by the present disclosure are implemented.

[0044] In order to achieve the above object, the present disclosure further provides an electronic device, including:

[0045] a memory having a computer program stored thereon;

[0046] A processor is used to execute the computer program in the memory to implement the steps of the method for monitoring the air leakage rate of an air preheater provided in the present disclosure.

[0047] In order to achieve the above-mentioned purpose, the present disclosure also provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the method for monitoring the air leakage rate of an air preheater provided by the present disclosure.

[0048] Through the above technical solution, the initial inlet flue gas oxygen content data of at least three measuring points of the air preheater inlet flue, the initial outlet flue gas oxygen content data of at least three measuring points of the air preheater outlet flue and the current unit load data can be obtained in the current scene, and in response to the current scene being determined to meet the monitoring conditions based on the current unit load data, the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data are determined to be valid data, and finally the air preheater leakage rate can be determined based on the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data. The above method does not require manual regular monitoring of the air preheater leakage rate, and can realize automatic monitoring of the air preheater leakage rate when it is determined that the current scene meets the monitoring conditions, thereby increasing the monitoring frequency of the air preheater leakage rate and meeting the monitoring requirements of the air preheater leakage rate.

[0049] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0051] Figure 1 The present invention is a flow chart of a method for monitoring the air leakage rate of an air preheater according to an exemplary embodiment.

[0052] Figure 2 It is a schematic structural diagram of an air preheater according to an exemplary embodiment.

[0053] Figure 3The present invention is a block diagram of a device for monitoring air leakage rate of an air preheater according to an exemplary embodiment.

[0054] Figure 4 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0055] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0056] The embodiments described in some embodiments of the present disclosure below do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0057] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0058] Figure 1 The present invention is a flow chart showing a method for monitoring the air leakage rate of an air preheater according to an exemplary embodiment. The method may include the following steps.

[0059] In step S11, the initial inlet flue gas oxygen content data of at least three measuring points of the air preheater inlet flue, the initial outlet flue gas oxygen content data of at least three measuring points of the air preheater outlet flue and the current unit load data are obtained in the current scenario.

[0060] For example, the current unit load data is used to represent the load data of the power plant unit under the current operating state, and the current unit load data can be determined by obtaining the current reading result of the smart meter; at least three measuring points of the air preheater inlet flue can be evenly spaced and arranged on the same horizontal line of the air preheater inlet flue, and each measuring point is arranged at an equal distance from the air preheater body; at least three measuring points of the air preheater outlet flue can be evenly spaced and arranged on the same horizontal line of the air preheater outlet flue, and each measuring point is arranged at an equal distance from the air preheater body.

[0061] To understand the location of the above measurement points, please refer to Figure 2 , Figure 21 is a schematic diagram showing the structure of an air preheater according to an exemplary embodiment. The air preheater may include: an air preheater body 200 , an air preheater inlet flue 201 , and an air preheater outlet flue 202 .

[0062] Take the air preheater inlet flue 201 and the air preheater outlet flue 202 as an example, each of which includes three measuring points: the air preheater inlet flue 201 includes the first measuring point A 1 , Second measuring point A 2 And the third measuring point A 3 Among them, the first measuring point A 1 , Second measuring point A 2 And the third measuring point A 3 Evenly spaced and arranged on the same horizontal line of the air preheater inlet flue 201, that is, the first measuring point A in the horizontal direction 1 The distance d from the air preheater inlet flue 201 1 、First measuring point A 1 With the second measuring point A 2 The distance between 2 , Second measuring point A 2 With the third measuring point A 3 The distance between 3 、The third measuring point A 3 The horizontal distance d from the air preheater inlet flue 201 4 Equal, and the first measuring point A 1 , Second measuring point A 2 And the third measuring point A 3 Furthermore, each measuring point is arranged at an equal distance from the air preheater body 200, that is, measuring point A in the vertical direction 1 Distance from air preheater body 200, measuring point A 2 The distance from the air preheater body 200 and the measuring point A 3 The distance from the air preheater body 200 is D 1 .

[0063] The air preheater outlet flue 202 includes a fourth measuring point B 1 、Fifth measuring point B 2 And the sixth measuring point B 3 Among them, the fourth measuring point B 1 、Fifth measuring point B 2 And the sixth measuring point B 3 Evenly spaced and arranged on the same horizontal line of the air preheater outlet flue 202, that is, the fourth measuring point B in the horizontal direction 1 The distance d from the air preheater outlet flue 202 5 、The fourth measuring point B 1With the fifth measuring point B 2 The distance between 6 、Fifth measuring point B 2 With the sixth measuring point B 3 The distance between 7 、The sixth measuring point B 3 The horizontal distance d from the air preheater outlet flue 202 8 Equal, and the fourth measuring point B 1 、Fifth measuring point B 2 And the sixth measuring point B 3 Furthermore, each measuring point is arranged at an equal distance from the air preheater body 200, that is, the fourth measuring point B in the vertical direction 1 The distance from the air preheater body 200 and the fifth measuring point B 2 The distance from the air preheater body 200 and the sixth measuring point B 3 The distance from the air preheater body 200 is D 2 .

[0064] It is understandable that in actual operation, the flue gas flow in the air preheater flue may be affected by many factors (such as pipeline design, airflow resistance, etc.), which may lead to different flue gas flow at different positions in the flue. Therefore, at least three measuring points are evenly spaced on the same horizontal line of the corresponding flue, and each measuring point is arranged at an equal distance from the air preheater body, which can reduce the impact of different local flow rates on the measurement results.

[0065] For example, the air preheater inlet flue may include 3 measuring points, 4 measuring points, 5 measuring points, etc.; the air preheater outlet flue may include 3 measuring points, 4 measuring points, 5 measuring points, etc., which is not limited in the present disclosure.

[0066] For example, the flue gas oxygen content at each measuring point of the air preheater inlet flue duct can be measured by a flue gas analyzer to obtain initial inlet flue gas oxygen content data; similarly, the flue gas oxygen content at each measuring point of the air preheater outlet flue duct can be measured by a flue gas analyzer to obtain initial outlet flue gas oxygen content data.

[0067] In step S12, in response to determining that the current scenario meets the monitoring condition based on the current unit load data, the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data are determined to be valid data.

[0068] For example, the monitoring condition is a condition for determining whether the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data collected in the current scene are valid data.

[0069] It is understandable that, since the current unit load data can be used to characterize the current operating state of the power plant unit, it is possible to determine whether the current operating state of the power plant unit is a stable state based on the current unit load data, and then when it is determined that the current operating state of the power plant unit is a stable state, it is determined that the current scene meets the monitoring conditions. For example, when it is determined that the current operating state of the power plant unit is not a stable state based on the current unit load data, it is determined that the current scene does not meet the monitoring conditions.

[0070] It should be noted that the present disclosure does not limit the method of judging whether the current operating state of the power plant unit is a stable state based on the current unit load data, that is, the method of determining whether the current scene meets the monitoring conditions based on the current unit load data of the power plant unit is not limited. For example, when the current unit load data remains unchanged within a preset time (for example, 1 hour, 2 hours), it is determined that the current operating state of the power plant unit is a stable state, that is, the current scene meets the monitoring conditions; otherwise, it is determined that the current operating state of the power plant unit is not a stable state, that is, the current scene does not meet the monitoring conditions; for another example, if the change amplitude of the current unit data within a preset time (for example, 1 hour, 2 hours) is less than a preset amplitude (such as 5%, 8%), it is determined that the current operating state of the power plant unit is a stable state, that is, the current scene meets the monitoring conditions; otherwise, it is determined that the current operation of the power plant unit is not a stable state, that is, the current scene does not meet the monitoring conditions.

[0071] The above method can ensure that when the current operating state of the power plant unit is stable, valid initial inlet flue gas oxygen content data and initial outlet flue gas oxygen content data are obtained, so as to subsequently analyze and process the valid initial inlet flue gas oxygen content data and initial outlet flue gas oxygen content data.

[0072] In step S13, the air preheater leakage rate is determined according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data.

[0073] Air preheater leakage refers to the situation in which smoke leaks during the operation of the air preheater due to poor sealing of the equipment or other reasons. Correspondingly, the air preheater leakage rate indicates the proportion of the leaked smoke content to the total smoke content.

[0074] In some embodiments, the middle value of at least three initial inlet flue gas oxygen content data can be determined to obtain the target inlet flue gas oxygen content data of the air preheater inlet flue; similarly, the middle value of at least three initial outlet flue gas oxygen content data can be determined to obtain the target outlet flue gas oxygen content data of the air preheater outlet flue. Thus, the difference between the target inlet flue gas oxygen content data and the target outlet flue gas oxygen content data can be determined, and the ratio of the difference to the target inlet flue gas oxygen content data is determined as the air preheater leakage rate.

[0075] Through the above technical solution, the initial inlet flue gas oxygen content data of at least three measuring points of the air preheater inlet flue, the initial outlet flue gas oxygen content data of at least three measuring points of the air preheater outlet flue and the current unit load data can be obtained in the current scene, and in response to the current scene being determined to meet the monitoring conditions based on the current unit load data, the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data are determined to be valid data, and finally the air preheater leakage rate can be determined based on the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data. The above method does not require manual regular monitoring of the air preheater leakage rate, and can realize automatic monitoring of the air preheater leakage rate when it is determined that the current scene meets the monitoring conditions, thereby increasing the monitoring frequency of the air preheater leakage rate and meeting the monitoring requirements of the air preheater leakage rate.

[0076] Optionally, when the current unit load data is greater than or equal to a preset proportion of the unit rated load, and the duration of the unit rated load being greater than or equal to the preset proportion is greater than or equal to a preset duration, it is determined that the current scenario meets the monitoring conditions.

[0077] It should be noted that the present application does not limit the preset ratio and the preset duration, for example, the preset ratio is 70%, 80% or 90%, etc.; the preset duration is 1.5 hours, 2 hours or 3 hours, etc. For example, the preset ratio is 80%; the preset duration is 2 hours.

[0078] It can be understood that when the current unit load data is greater than or equal to a preset proportion of the unit rated load, and the duration of the unit rated load greater than or equal to the preset proportion is greater than or equal to the preset duration, it means that the current operating state of the power plant unit is a stable high-load state. In this way, more accurate and stable data can be collected in the current scenario, and it can be determined that the current scenario meets the monitoring conditions.

[0079] Therefore, it is possible to determine that the current operating state of the power plant unit is a stable state based on the current unit load data, and further determine that the data collected in the current scenario is valid data.

[0080] Optionally, the air preheater leakage rate is determined according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data, including: determining the target inlet flue gas oxygen content of the air preheater inlet flue according to the initial inlet flue gas oxygen content data, and determining the target outlet flue gas oxygen content of the air preheater outlet flue according to the initial outlet flue gas oxygen content data; determining a first excess air coefficient at the air preheater inlet according to the target inlet flue gas oxygen content, and determining a second excess air coefficient at the air preheater outlet according to the target outlet flue gas oxygen content; obtaining the leakage coefficient according to the difference between the first excess air coefficient and the second excess air coefficient; and determining the air preheater leakage rate according to the leakage coefficient and the first excess air coefficient.

[0081] Among them, the excess air coefficient is the ratio of the actual air consumption to the theoretical air consumption. During the calibration, calculation or control of the heating furnace combustion, the excess air coefficient can be obtained from the flue gas composition (for example, the oxygen content of the flue gas, the nitrogen content of the flue gas): The leakage coefficient refers to the proportion of flue gas leaked when the boiler or combustion equipment leaks due to poor sealing and other reasons during operation. It is usually the difference in the excess air coefficients in the flue gas at the inlet and outlet of the flue gas channel or the ratio of the air volume difference at the inlet and outlet of the air channel to the theoretical air volume.

[0082] For example, the average value of the initial inlet flue gas oxygen content data of at least three measuring points can be determined to obtain the target inlet flue gas oxygen content of the air preheater inlet flue; and the average value of the initial outlet flue gas oxygen content data of at least three measuring points can be determined to obtain the target outlet flue gas oxygen content of the air preheater outlet flue. In this way, the first excess air coefficient can be determined according to the target inlet flue gas oxygen content, and the second excess air coefficient can be determined according to the target outlet flue gas oxygen content. Furthermore, the air leakage coefficient can be obtained according to the difference between the first excess air coefficient and the second excess air coefficient, and the air leakage rate of the air preheater can be determined according to the ratio of the air leakage coefficient to the first excess air coefficient.

[0083] Optionally, the initial inlet flue gas oxygen content data at least includes the first measuring point A 1 The oxygen content data of the first inlet flue gas and the second measuring point A 2 The oxygen content data of the second inlet flue gas and the third measuring point A 3 The target inlet flue gas oxygen content of the air preheater inlet flue is determined according to the initial inlet flue gas oxygen content data, including: determining the average of the first inlet flue gas oxygen content data, the second inlet flue gas oxygen content data and the third inlet flue gas oxygen content data to obtain the average inlet flue gas oxygen content data; determining the weighted average of the average inlet flue gas oxygen content data within the duration that the current unit load data is greater than or equal to a preset proportion of the unit rated load to obtain the target inlet flue gas oxygen content.

[0084] Based on the above embodiment, the target inlet flue gas oxygen content can be obtained by the following formula:

[0085]

[0086] Where a is the target inlet flue gas oxygen content; is the average inlet flue gas oxygen content data; a 1 is the oxygen content data of the flue gas at the first inlet; a 2 is the oxygen content data of the flue gas at the second inlet; a 3 is the oxygen content data of the flue gas at the third inlet; t 0The starting time point when the current unit load data is greater than or equal to the preset ratio of the unit rated load; t 1 It is the end time point when the current unit load data is greater than or equal to the preset ratio of the unit rated load.

[0087] Optionally, the initial outlet flue gas oxygen content data includes at least the fourth measuring point B 1 The oxygen content of flue gas at the first outlet and the fifth measuring point B 2 The oxygen content data of the second outlet flue gas and the sixth measuring point B 3 The target outlet flue gas oxygen content of the air preheater outlet flue is determined according to the initial outlet flue gas oxygen content data, including: determining the average of the first outlet flue gas oxygen content data, the second outlet flue gas oxygen content data and the third outlet flue gas oxygen content data to obtain the average outlet flue gas oxygen content data; determining the weighted average of the average outlet flue gas oxygen content data within the duration that the current unit load data is greater than or equal to a preset proportion of the unit rated load to obtain the target outlet flue gas oxygen content.

[0088] On the basis of the above embodiment, a weighted average value of the average outlet flue gas oxygen content data is determined within the duration to obtain the target outlet flue gas oxygen content, including: obtaining the target outlet flue gas oxygen content according to the following formula:

[0089]

[0090] Wherein, b is the target outlet flue gas oxygen content; is the average outlet flue gas oxygen content data; b 1 is the oxygen content data of the flue gas at the first outlet; b 2 is the oxygen content data of the flue gas at the second outlet; b 3 is the oxygen content data of the flue gas at the third outlet; t 0 The starting time point when the current unit load data is greater than or equal to the preset ratio of the unit rated load; t 1 It is the end time point when the current unit load data is greater than or equal to the preset ratio of the unit rated load.

[0091] Optionally, determining a first excess air coefficient at an air preheater inlet according to a target inlet flue gas oxygen content, and determining a second excess air coefficient at an air preheater outlet according to a target outlet flue gas oxygen content, comprises: determining the first excess air coefficient and the second excess air coefficient according to the following formula:

[0092]

[0093] Wherein, α' is the first excess air coefficient, α" is the second excess air coefficient; a is the target inlet flue gas oxygen content; b is the target outlet flue gas oxygen content.

[0094] Based on the above embodiment, the air leakage coefficient can be determined by the following formula:

[0095] Δα=α'-α"

[0096] Among them, Δα is the air leakage coefficient; α' is the first excess air coefficient, and α" is the second excess air coefficient.

[0097] Optionally, determining the air preheater leakage rate according to the air leakage coefficient and the first excess air coefficient includes: determining the air preheater leakage rate according to the ratio of the air leakage coefficient to the first excess air coefficient.

[0098] Based on the above embodiment, the air preheater leakage rate is determined according to the ratio of the air leakage coefficient to the first excess air coefficient, including: determining the air preheater leakage rate according to the following formula:

[0099]

[0100] Among them, A L is the air preheater leakage rate; Δα is the leakage coefficient; α' is the first excess air coefficient.

[0101] Through the above technical scheme, it is possible to realize automatic monitoring of the air preheater leakage rate and increase the monitoring frequency of the air preheater leakage rate to meet the monitoring needs of the air preheater leakage rate.

[0102] See also Figure 3 , Figure 3 is a block diagram of a device for monitoring air leakage rate of an air preheater according to an exemplary embodiment. Figure 3 The air preheater leakage rate monitoring device 100 may include a data monitoring module 101 , a valid data determination module 102 , and an air preheater leakage rate calculation module 103 .

[0103] The data monitoring module 101 is configured to obtain the initial inlet flue gas oxygen content data of at least three measuring points of the air preheater inlet flue, the initial outlet flue gas oxygen content data of at least three measuring points of the air preheater outlet flue and the current unit load data in the current scenario.

[0104] The valid data determination module 102 is configured to determine that the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data are valid data in response to determining that the current scenario meets the monitoring condition based on the current unit load data.

[0105] The air preheater leakage rate calculation module 103 is configured to determine the air preheater leakage rate according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data.

[0106] Optionally, the valid data determination module 102 is also configured to determine that the current scenario satisfies the monitoring condition when the current unit load data is greater than or equal to a preset proportion of the unit rated load, and the duration of the unit rated load being greater than or equal to the preset proportion is greater than or equal to a preset duration.

[0107] The air preheater leakage rate calculation module 103 is also configured to determine the target inlet flue gas oxygen content of the air preheater inlet flue according to the initial inlet flue gas oxygen content data, and determine the target outlet flue gas oxygen content of the air preheater outlet flue according to the initial outlet flue gas oxygen content data; determine the first excess air coefficient at the air preheater inlet according to the target inlet flue gas oxygen content, and determine the second excess air coefficient at the air preheater outlet according to the target outlet flue gas oxygen content; obtain the leakage coefficient according to the difference between the first excess air coefficient and the second excess air coefficient; determine the air preheater leakage rate according to the leakage coefficient and the first excess air coefficient.

[0108] The air preheater leakage rate calculation module 103 is also configured to determine the average of the first inlet flue gas oxygen content data, the second inlet flue gas oxygen content data and the third inlet flue gas oxygen content data to obtain the average inlet flue gas oxygen content data; determine the weighted average of the average inlet flue gas oxygen content data within the duration when the current unit load data is greater than or equal to a preset proportion of the unit rated load to obtain the target inlet flue gas oxygen content.

[0109] The air preheater leakage rate calculation module 103 is also configured to obtain the target inlet flue gas oxygen content according to the following formula:

[0110]

[0111] Wherein, a is the target inlet flue gas oxygen content; is the average inlet flue gas oxygen content data; a 1 is the oxygen content data of the first inlet flue gas; 2 is the oxygen content data of the second inlet flue gas; 3 is the oxygen content data of the flue gas at the third inlet; 0 is the starting time point when the current unit load data is greater than or equal to the preset ratio of the unit rated load; t 1 It is the end time point when the current unit load data is greater than or equal to the preset proportion of the unit rated load.

[0112] The air preheater leakage rate calculation module 103 is also configured to determine the average of the first outlet flue gas oxygen content data, the second outlet flue gas oxygen content data and the third outlet flue gas oxygen content data to obtain the average outlet flue gas oxygen content data; determine the weighted average of the average outlet flue gas oxygen content data within the duration that the current unit load data is greater than or equal to a preset proportion of the unit rated load to obtain the target outlet flue gas oxygen content.

[0113] The air preheater leakage rate calculation module 103 is also configured to obtain the target outlet flue gas oxygen content according to the following formula:

[0114]

[0115] Wherein, b is the target outlet flue gas oxygen content; is the average outlet flue gas oxygen content data; b 1 b is the oxygen content data of the first outlet flue gas; 2 is the oxygen content data of the second outlet flue gas; b 3 is the oxygen content data of the flue gas at the third outlet; 0 is the starting time point when the current unit load data is greater than or equal to the preset ratio of the unit rated load; t 1 It is the end time point when the current unit load data is greater than or equal to the preset proportion of the unit rated load.

[0116] The air preheater leakage rate calculation module 103 is further configured to determine the air preheater leakage rate according to the ratio of the leakage coefficient to the first excess air coefficient.

[0117] The air preheater leakage rate calculation module 103 is also configured to determine the air preheater leakage rate according to the following formula:

[0118]

[0119] Among them, A L is the air preheater leakage rate; Δα is the leakage coefficient; α' is the first excess air coefficient.

[0120] The air preheater leakage rate calculation module 103 is further configured to determine the first excess air coefficient and the second excess air coefficient according to the following formula:

[0121]

[0122] Wherein, α' is the first excess air coefficient, α" is the second excess air coefficient; a is the target inlet flue gas oxygen content; b is the target outlet flue gas oxygen content.

[0123] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0124] Figure 4 is a block diagram of an electronic device 1900 according to an exemplary embodiment. Figure 4 The electronic device 1900 includes a processor 1922, which may be one or more, and a memory 1932 for storing a computer program executable by the processor 1922. The computer program stored in the memory 1932 may include one or more modules, each corresponding to a set of instructions. In addition, the processor 1922 may be configured to execute the computer program to perform the steps of the above-mentioned method for monitoring the air leakage rate of the air preheater.

[0125] In addition, the electronic device 1900 may further include a power supply component 1926 and a communication component 1950, wherein the power supply component 1926 may be configured to perform power management of the electronic device 1900, and the communication component 1950 may be configured to implement communication, for example, wired or wireless communication, of the electronic device 1900. In addition, the electronic device 1900 may further include an input / output (I / O) interface 1958. The electronic device 1900 may operate based on an operating system stored in the memory 1932.

[0126] In an exemplary embodiment, a non-transitory computer-readable storage medium is also provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned method for monitoring the air leakage rate of the air preheater are implemented. The non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0127] In another exemplary embodiment, a computer program product is also provided. When the computer program is executed by a processor, the computer program is used to perform the steps of the above-mentioned method for monitoring the air leakage rate of the air preheater.

[0128] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0129] It should also be noted that the various specific technical features described in the above specific implementation methods can be combined in any suitable manner without contradiction.

[0130] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A method for monitoring air leakage rate of an air preheater, characterized in that: The method comprises: Obtain the initial inlet flue gas oxygen content data of at least three measuring points of the air preheater inlet flue, the initial outlet flue gas oxygen content data of at least three measuring points of the air preheater outlet flue and the current unit load data in the current scenario; In response to determining that the current scenario meets a monitoring condition based on the current unit load data, determining that the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data are valid data; The air preheater leakage rate is determined according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data.

2. The method according to claim 1, characterized in that When the current unit load data is greater than or equal to a preset proportion of the unit rated load, and the duration of the unit rated load being greater than or equal to the preset proportion is greater than or equal to a preset duration, it is determined that the current scenario meets the monitoring condition.

3. The method according to claim 1, characterized in that The determining the air preheater air leakage rate according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data comprises: Determining a target inlet flue gas oxygen content of the air preheater inlet flue according to the initial inlet flue gas oxygen content data, and determining a target outlet flue gas oxygen content of the air preheater outlet flue according to the initial outlet flue gas oxygen content data; Determine a first excess air coefficient at an air preheater inlet according to the target inlet flue gas oxygen content, and determine a second excess air coefficient at an air preheater outlet according to the target outlet flue gas oxygen content; Obtaining an air leakage coefficient according to a difference between the first excess air coefficient and the second excess air coefficient; The air preheater leakage rate is determined according to the air leakage coefficient and the first excess air coefficient.

4. The method according to claim 3, characterized in that The initial inlet flue gas oxygen content data at least includes first inlet flue gas oxygen content data at a first measuring point, second inlet flue gas oxygen content data at a second measuring point, and third inlet flue gas oxygen content data at a third measuring point. Determining the target inlet flue gas oxygen content of the air preheater inlet flue duct according to the initial inlet flue gas oxygen content data includes: Determine the average value of the first inlet smoke oxygen content data, the second inlet smoke oxygen content data and the third inlet smoke oxygen content data to obtain average inlet smoke oxygen content data; The weighted average value of the average inlet flue gas oxygen content data is determined within the duration that the current unit load data is greater than or equal to a preset proportion of the unit rated load to obtain the target inlet flue gas oxygen content.

5. The method according to claim 4, characterized in that Determining the weighted average of the average inlet flue gas oxygen content data within the duration to obtain the target inlet flue gas oxygen content includes: The target inlet flue gas oxygen content is obtained according to the following formula: Wherein, a is the target inlet flue gas oxygen content; is the average inlet flue gas oxygen content data; a1 is the first inlet flue gas oxygen content data; a2 is the second inlet flue gas oxygen content data; a3 is the third inlet flue gas oxygen content data; t0 is the starting time point when the current unit load data is greater than or equal to the preset proportion of the unit rated load; t1 is the ending time point when the current unit load data is greater than or equal to the preset proportion of the unit rated load.

6. The method according to claim 3, characterized in that The initial outlet flue gas oxygen content data at least includes first outlet flue gas oxygen content data at a fourth measuring point, second outlet flue gas oxygen content data at a fifth measuring point, and third outlet flue gas oxygen content data at a sixth measuring point. Determining the target outlet flue gas oxygen content of the air preheater outlet flue according to the initial outlet flue gas oxygen content data includes: Determine an average value of the first outlet flue gas oxygen content data, the second outlet flue gas oxygen content data, and the third outlet flue gas oxygen content data to obtain average outlet flue gas oxygen content data; The weighted average value of the average outlet flue gas oxygen content data is determined within the duration that the current unit load data is greater than or equal to a preset proportion of the unit rated load to obtain the target outlet flue gas oxygen content.

7. The method according to claim 6, characterized in that Determining the weighted average of the average outlet flue gas oxygen content data within the duration to obtain the target outlet flue gas oxygen content includes: The target outlet flue gas oxygen content is obtained according to the following formula: Wherein, b is the target outlet flue gas oxygen content; is the average outlet flue gas oxygen content data; b1 is the first outlet flue gas oxygen content data; b2 is the second outlet flue gas oxygen content data; b3 is the third outlet flue gas oxygen content data; t0 is the starting time point when the current unit load data is greater than or equal to the preset proportion of the unit rated load; t1 is the ending time point when the current unit load data is greater than or equal to the preset proportion of the unit rated load.

8. The method according to claim 3, characterized in that The determining the air preheater leakage rate according to the air leakage coefficient and the first excess air coefficient comprises: The air preheater leakage rate is determined according to the ratio of the air leakage coefficient to the first excess air coefficient.

9. The method according to claim 8, characterized in that The determining the air preheater leakage rate according to the ratio of the air leakage coefficient to the first excess air coefficient comprises: The air preheater leakage rate is determined according to the following formula: Among them, A L is the air preheater leakage rate; Δα is the leakage coefficient; α' is the first excess air coefficient.

10. The method according to claim 3, characterized in that The method of determining a first excess air coefficient at an air preheater inlet according to the target inlet flue gas oxygen content, and determining a second excess air coefficient at an air preheater outlet according to the target outlet flue gas oxygen content, comprises: The first excess air coefficient and the second excess air coefficient are determined according to the following formula: Wherein, α' is the first excess air coefficient, α" is the second excess air coefficient; a is the target inlet flue gas oxygen content; b is the target outlet flue gas oxygen content.

11. A device for monitoring air leakage rate of an air preheater, characterized in that: include: A data monitoring module is used to obtain the initial inlet flue gas oxygen content data of at least three measuring points of the air preheater inlet flue, the initial outlet flue gas oxygen content data of at least three measuring points of the air preheater outlet flue and the current unit load data in the current scenario; A valid data determination module, configured to determine that the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data are valid data in response to determining that the current scene meets the monitoring condition based on the current unit load data; The air preheater air leakage rate calculation module is used to determine the air preheater air leakage rate according to the initial inlet flue gas oxygen content data and the initial outlet flue gas oxygen content data.

12. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

13. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 10.

14. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

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