A method and device for adjusting air distribution of a pulverized coal boiler and a storage medium

Abstract

Embodiments of the present application disclose a kind of coal powder boiler air distribution adjustment method, device and storage medium.The method comprises: obtaining the flue gas temperature data of multiple measuring points at furnace outlet and the operating condition parameters of coal powder boiler;The operating condition parameters include at least one of the following: unit load, coal quality, mill combination mode;According to flue gas temperature data and operating condition parameters, determine the current furnace outlet cross section temperature field and the reference furnace outlet cross section temperature field;Compare and analyze the current furnace outlet cross section temperature field and the reference furnace outlet cross section temperature field, obtain comparison and analysis result;According to comparison and analysis result, judge whether the combustion state in furnace is abnormal;If the combustion state in furnace is abnormal, then according to comparison and analysis result, determine the change of furnace flame center position, and adjust the air distribution of furnace according to the change of furnace flame center position.This can accurately calculate the change of flame center position, and realize the reasonable adjustment of coal powder boiler air distribution.

Description

Technical Field

[0001] This invention relates to the field of boilers, and more specifically, to a method, apparatus, and storage medium for adjusting the air distribution of a pulverized coal boiler. Background Technology

[0002] During the operation of pulverized coal boilers in power plants, the combustion state inside the furnace has always been one of the important factors affecting the safe and economical operation of the generating units. In particular, in recent years, the proportion of intermittent renewable energy connected to the grid has increased significantly, causing thermal power units to operate in peak-shaving or low-load conditions for a long time. This has further aggravated the instability of combustion inside the furnace, leading to a series of problems such as overheating and tube rupture of heating surfaces, reduced combustion efficiency, and high nitrogen oxide emissions, resulting in huge economic losses for power plants.

[0003] However, due to insufficient on-site measuring points and data delays, operators may misjudge the combustion status inside the furnace, leading to unreasonable air distribution. Therefore, how to rationally adjust the air distribution of pulverized coal boilers has become an urgent technical problem to be solved. Summary of the Invention

[0004] In view of this, embodiments of the present invention disclose a method, apparatus and storage medium for adjusting the air distribution of a pulverized coal boiler, so as to reasonably adjust the air distribution of a pulverized coal boiler.

[0005] The technical solutions provided by the embodiments of the present invention are as follows:

[0006] The first aspect of this invention provides a method for adjusting the air distribution of a pulverized coal boiler, the method comprising:

[0007] Acquire flue gas temperature data and operating parameters of the pulverized coal boiler from multiple measuring points at the furnace outlet; the operating parameters include at least one of the following: unit load, coal quality, and coal mill combination mode;

[0008] Based on the flue gas temperature data and the operating condition parameters, determine the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field;

[0009] By comparing and analyzing the current furnace outlet cross-sectional temperature field with the reference furnace outlet cross-sectional temperature field, the comparison and analysis results are obtained.

[0010] Based on the comparative analysis results, determine whether the combustion state inside the furnace is abnormal;

[0011] If the combustion state inside the furnace is abnormal, the change in the position of the furnace flame center is determined based on the comparison analysis results, and the furnace air distribution is adjusted according to the change in the position of the furnace flame center.

[0012] In one possible implementation, determining the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field based on the flue gas temperature data and the operating condition parameters includes:

[0013] The initial temperature field prediction model is corrected using the flue gas temperature data to obtain the final temperature field prediction model; wherein, the initial temperature field prediction model is trained by the furnace outlet cross-sectional temperature field samples under different operating conditions, and the furnace outlet cross-sectional temperature field samples are samples under normal combustion conditions in the furnace.

[0014] The operating condition parameters are input into the final temperature field prediction model to obtain the temperature field of the reference furnace outlet cross section.

[0015] The operating condition parameters and the flue gas temperature data are input into the final temperature field prediction model to obtain the current furnace outlet cross-sectional temperature field.

[0016] In one possible implementation, the process of constructing the initial temperature field prediction model includes:

[0017] Numerical simulation was used to obtain samples of the temperature field at the furnace outlet cross section under different operating conditions.

[0018] The initial least squares support vector machine model is trained using the temperature field samples from the furnace outlet cross section to obtain the initial temperature field prediction model.

[0019] In one possible implementation, the comparison analysis results include: the deviation between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field; and determining the change in the furnace flame center position based on the comparison analysis results includes:

[0020] If the deviation result is greater than the first preset value and less than or equal to the second preset value, the position of the furnace flame center is determined to be slightly moved upward.

[0021] If the deviation result is greater than the second preset value, it is determined that the center position of the furnace flame has shifted upward significantly.

[0022] In one possible implementation, adjusting the furnace air distribution based on changes in the furnace flame center position includes:

[0023] If the center of the flame in the furnace moves slightly upward, the proportion of burnout air is reduced and the air coefficient of the main combustion zone in the furnace is increased.

[0024] If the center of the furnace flame shifts significantly upwards, the top coal mill will be shut down, the top primary air supply will be turned off, and the combustion of the lower burners will be maintained.

[0025] In one possible implementation, the comparison analysis results include: the current furnace outlet.

[0026] The method further includes the following: the deviation between the cross-sectional temperature field and the cross-sectional temperature field at the outlet of the reference furnace.

[0027] If the deviation result is greater than the third preset value and less than or equal to the first preset value, then increase the speed of the dynamic separator, and / or increase the hydraulic loading force of the medium-speed mill, and / or level the primary air-powder pipe, and / or adjust the opening of the secondary air damper.

[0028] In one possible implementation, the comparison analysis result includes: the deviation result between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field; the comparison analysis of the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field to obtain the comparison analysis result includes:

[0029] Determine the highest temperature point of the current furnace outlet cross-sectional temperature field and the highest temperature point of the reference furnace outlet cross-sectional temperature field;

[0030] Using the highest temperature point of the current furnace outlet cross-sectional temperature field as the first center, a first temperature distribution curve of the current furnace outlet cross-sectional temperature field along the x-direction is obtained; using the highest temperature point of the reference furnace outlet cross-sectional temperature field as the second center, a second temperature distribution curve of the reference furnace outlet cross-sectional temperature field along the x-direction is obtained; or, using the highest temperature point of the current furnace outlet cross-sectional temperature field as the first center, a first temperature distribution curve of the current furnace outlet cross-sectional temperature field along the y-direction is obtained; using the highest temperature point of the reference furnace outlet cross-sectional temperature field as the second center, a second temperature distribution curve of the reference furnace outlet cross-sectional temperature field along the y-direction is obtained.

[0031] Calculate the average deviation between the first temperature distribution curve and the second temperature distribution curve to obtain the deviation result between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field.

[0032] A second aspect of this application provides a pulverized coal boiler air distribution adjustment device, the device comprising:

[0033] The acquisition unit is used to acquire flue gas temperature data and operating parameters of the pulverized coal boiler from multiple measuring points at the furnace outlet; the operating parameters include at least one of the following: unit load, coal quality, and coal mill combination mode;

[0034] The determining unit is used to determine the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field based on the flue gas temperature data and the operating condition parameters.

[0035] The comparison and analysis unit is used to compare and analyze the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field to obtain the comparison and analysis results.

[0036] The judgment unit is used to determine whether the combustion state inside the furnace is abnormal based on the comparison and analysis results.

[0037] The adjustment unit is used to determine the change in the position of the furnace flame center based on the comparison analysis results if the combustion state inside the furnace is abnormal, and to adjust the furnace air distribution according to the change in the position of the furnace flame center.

[0038] Thirdly, this application provides a pulverized coal boiler air distribution adjustment device, the device comprising: a processor, a memory, and a system bus;

[0039] The processor and the memory are connected via the system bus;

[0040] The memory is used to store one or more programs, the one or more programs including instructions, which, when executed by the processor, cause the processor to perform the pulverized coal boiler air distribution adjustment method described in any of the first aspects above.

[0041] Fourthly, embodiments of this application provide a computer-readable storage medium storing instructions that, when executed on a terminal device, cause the terminal device to perform the pulverized coal boiler air distribution adjustment method described in any of the first aspects above.

[0042] Fifthly, embodiments of this application provide a computer program product that, when run on a terminal device, causes the terminal device to execute the pulverized coal boiler air distribution adjustment method described in any of the first aspects above.

[0043] Based on the above technical solution, this application has the following beneficial effects:

[0044] This invention discloses a method, apparatus, and storage medium for adjusting the air distribution of a pulverized coal boiler. The method includes: acquiring flue gas temperature data from multiple measuring points at the furnace outlet and operating parameters of the pulverized coal boiler; these operating parameters include at least one of the following: unit load, coal quality, and pulverizer configuration; determining the current furnace outlet cross-sectional temperature field and a reference furnace outlet cross-sectional temperature field based on the flue gas temperature data and operating parameters; comparing and analyzing the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field to obtain a comparison analysis result; determining whether the combustion state inside the furnace is abnormal based on the comparison analysis result; if the combustion state is abnormal, determining the change in the furnace flame center position based on the comparison analysis result, and adjusting the furnace air distribution accordingly. As can be seen, the embodiments of this application can track the operating conditions of pulverized coal boilers in real time. Based on the acquired flue gas temperature data and operating parameters, the combustion state inside the furnace can be identified in real time and effectively, and the changes in the flame center position can be accurately calculated. In this way, the furnace air distribution can be reasonably adjusted according to the changes in the flame center position, thereby achieving reasonable adjustment of the air distribution of the pulverized coal boiler. This avoids the misjudgment of the combustion state inside the furnace and the inability to start combustion in a timely manner caused by interference such as insufficient actual measuring points and data delays.

[0045] The issue of adjustment. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the published drawings without creative effort.

[0047] Figure 1 This is a flowchart of a method for adjusting the air distribution of a pulverized coal boiler, as disclosed in an embodiment of this application.

[0048] Figure 2 This is a schematic diagram of the arrangement of flue gas temperature measuring points in a pulverized coal boiler disclosed in an embodiment of this application;

[0049] Figure 3 This is a cross-sectional schematic diagram of the arrangement of flue gas temperature measuring points in a tangentially circular pulverized coal boiler disclosed in an embodiment of this application;

[0050] Figure 4 This is a cross-sectional schematic diagram of the arrangement of flue gas temperature measuring points in a wall-mounted counter-pressure pulverized coal boiler disclosed in an embodiment of this application;

[0051] Figure 5 This is a schematic diagram of temperature distribution, a first temperature distribution curve, and a second temperature distribution curve disclosed in an embodiment of this application;

[0052] Figure 6 This is a flowchart of another method for adjusting the air distribution of a pulverized coal boiler, as disclosed in an embodiment of the present invention.

[0053] Figure 7 This is a schematic diagram of the structure of a pulverized coal boiler air distribution adjustment device disclosed in an embodiment of the present invention. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] This invention discloses a method, apparatus, and storage medium for adjusting the air distribution of a pulverized coal boiler. The method includes: acquiring flue gas temperature data from multiple measuring points at the furnace outlet and operating parameters of the pulverized coal boiler; these operating parameters include at least one of the following: unit load, coal quality, and pulverizer configuration; determining the current furnace outlet cross-sectional temperature field and a reference furnace outlet cross-sectional temperature field based on the flue gas temperature data and operating parameters; comparing and analyzing the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field to obtain a comparison analysis result; and judging the boiler's performance based on the comparison analysis result.

[0056] The system monitors whether the internal combustion state is abnormal. If the internal combustion state is abnormal, the changes in the position of the flame center in the furnace are determined based on the comparative analysis results, and the furnace air distribution is adjusted accordingly. It is evident that this embodiment can track the operating conditions of the pulverized coal boiler in real time. Based on the acquired flue gas temperature data and operating parameters, it can effectively identify the internal combustion state and accurately calculate the changes in the flame center position. This allows for reasonable adjustment of the furnace air distribution based on the changes in the flame center position, thus avoiding errors in assessing the internal combustion state and delays caused by insufficient actual measuring points or data delays. Ultimately, this ensures that the performance and environmental protection indicators of pulverized coal boiler combustion are met.

[0057] See Figure 1 The present invention discloses a flowchart of a method for adjusting the air distribution of a pulverized coal boiler, the method comprising:

[0058] S101. Obtain flue gas temperature data and operating parameters of the pulverized coal boiler from multiple measuring points at the furnace outlet; the operating parameters include at least one of the following: unit load, coal quality, and coal mill combination mode;

[0059] In this application embodiment, multiple measuring points may include at least two of the following: the upper part of the flame deflector, the bottom of the screen-type superheater, the rear of the screen-type superheater, the rear of the high-temperature reheater, and the rear of the high-temperature superheater. That is, the installation position of the flue gas temperature detection device in this application embodiment can be the upper part of the flame deflector or the bottom of the screen-type superheater, or it can be behind the screen-type superheater, the high-temperature reheater, or the high-temperature superheater; there is no specific limitation, and it can be set according to the actual situation. The flue gas temperature detection device in this application embodiment can be an infrared thermometer or an acoustic thermometer; there is no specific limitation, and it can be set according to the actual situation.

[0060] In one possible implementation, the arrangement of flue gas temperature measuring points in the pulverized coal boiler in this embodiment is as follows: Figure 2 As shown. More specifically, in one possible implementation, the flue gas temperature measuring points of the pulverized coal boiler are arranged in a tangential circle at the four corners as follows: Figure 3 As shown; the arrangement of flue gas temperature measuring points in a wall-mounted, counter-pressure pulverized coal boiler is as follows. Figure 4 As shown. Among them, Figure 3 and Figure 4 The multiple small white icons in the diagram indicate the locations of the measuring points.

[0061] It should be noted that the current unit load and pulverizer combination of the pulverized coal boiler can be obtained from the Distributed Control System (DCS), while the current coal quality of the pulverized coal boiler can be obtained by manually inputting coal quality information. The coal quality can include any of the following: lignite, bituminous coal, anthracite, etc. Based on the composition of carbon (Carb), hydrogen (Har), oxygen (Oar), nitrogen (Nar), sulfur (Sar), moisture (Mar), and ash (Aar), the coal quality can be further classified into: Class I lignite, Class II lignite, Class I bituminous coal, Class II bituminous coal, etc. The pulverized coal boiler uses ABCDE pulverizers, and at least one of the following can be selected based on actual conditions: A, B, C, D, and E pulverizers.

[0062] A single coal mill can be combined in the following ways: A coal mill combination; A coal mill, B coal mill and C coal mill combination; C coal mill and E coal mill combination; C coal mill, D coal mill and E coal mill combination, etc.

[0063] The operating parameters in this embodiment may also include: main reheater steam temperature, main reheater steam pressure, main reheater flow rate, coal feed rate, economizer outlet flue gas oxygen content, and blower inlet air temperature, etc. There are no specific limitations; these parameters can be set according to actual conditions. These parameters can also be obtained from the DCS.

[0064] S102. Determine the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field based on the flue gas temperature data and the operating condition parameters.

[0065] S103. Compare and analyze the current furnace outlet cross-sectional temperature field with the reference furnace outlet cross-sectional temperature field to obtain the comparison and analysis results;

[0066] The comparison analysis results in this application embodiment may include the deviation results between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field. For example, the deviation result is 3%, the deviation result is 9%, the deviation result is 15%, etc. It is understood that the above is only an exemplary illustration and should not be construed as a limitation of this application.

[0067] S104. Determine whether the combustion state inside the furnace is abnormal based on the comparison and analysis results.

[0068] In this embodiment, the abnormality of the combustion state inside the furnace can be determined based on the deviation between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field. Specifically: if the deviation is greater than a first preset value, the combustion state inside the furnace is determined to be abnormal; if the deviation is less than or equal to the first preset value, the combustion state inside the furnace is determined to be normal. The first preset value can be 9%, 9.5%, etc., and is not specifically limited; it can be set according to actual conditions.

[0069] S105. If the combustion state inside the furnace is abnormal, the change in the position of the furnace flame center is determined according to the comparison analysis results, and the furnace air distribution is adjusted according to the change in the position of the furnace flame center.

[0070] It should be noted that the highest temperature zone in the furnace is the center of the furnace flame. For example, if the calculated highest temperature is 1600K, the highest temperature zone can be selected between 1550 and 1600K. It is understood that the above is merely an illustrative example and should not be construed as a limitation of this application.

[0071] In this embodiment of the application, determining the change in the furnace flame center position based on the comparison analysis results may specifically include: if the deviation result is greater than a first preset value and less than or equal to a second preset value, determining that the furnace flame center position has shifted slightly upward; if the deviation result is greater than the second preset value, determining that the furnace flame center position has shifted slightly upward.

[0072] The flame center position shifts significantly upwards. For example, if the first preset value is 9% and the second preset value is 13.6%, when the deviation is greater than 9% but less than or equal to 13.6%, the furnace temperature is determined to be overheating, and the flame center position shifts slightly upwards; when the deviation is greater than 13.6%, the furnace temperature is determined to be severely overheating, and the flame center position shifts significantly upwards. It is understood that the above is merely an illustrative example and should not be construed as a limitation of this application.

[0073] In this embodiment, when the center of the furnace flame shifts slightly upward, the secondary air distribution and burnout air in the main combustion zone of the furnace need to be adjusted to control the center of the furnace flame; when the center of the furnace flame shifts significantly upward, the air distribution method needs to be changed to make the center of the furnace flame shift downward. Specifically, if the center of the furnace flame shifts slightly upward, the proportion of burnout air is reduced and the air coefficient in the main combustion zone of the furnace is increased; if the center of the furnace flame shifts significantly upward, the uppermost coal mill is shut down, the uppermost primary air is turned off, and combustion in the lower burners is maintained.

[0074] In one possible implementation, if the combustion state inside the furnace is normal, the original damper opening is maintained. Further, if the deviation is less than or equal to a third preset value, the original damper opening is maintained; if the deviation is greater than the third preset value but less than or equal to the first preset value, the dynamic separator speed is increased, and / or the hydraulic loading force of the medium-speed mill is increased, and / or the primary air-coal pipe is leveled, and / or the secondary air damper opening is adjusted. For example, if the first preset value is 9% and the third preset value is 4.5%, when the deviation is determined to be less than or equal to 4.5%, the furnace temperature fluctuation is normal, and the original damper opening is maintained; when the deviation is determined to be greater than 4.5% but less than or equal to 9%, the furnace temperature is slightly overheated, and no air distribution adjustment is needed, maintaining the original damper opening. In this case, the dynamic separator speed can be increased, and / or the hydraulic loading force of the medium-speed mill can be increased, and / or the primary air-coal pipe can be leveled, and / or the secondary air damper opening can be adjusted. It is understood that the above is merely an illustrative example and should not be construed as a limitation of this application. It should be noted that increasing the speed of the dynamic separator and / or increasing the hydraulic loading force of the medium-speed mill can improve the fineness of the pulverized coal, thereby increasing the pulverized coal combustion rate and keeping the center of the furnace flame in the middle position; leveling the primary air-coal pipe can ensure that the momentum of each burner nozzle is consistent, preventing flame deviation; adjusting the opening of the secondary air damper can assist the primary air in regulating the oxygen content during operation, promoting uniform flame combustion. In actual operation, the instruments may show that the primary air-coal pipe is leveled, but due to the long length of the pipes and the resistance deviations between the pipes, there will be differences after entering the furnace. Therefore, secondary air adjustment is required to match the local airflow and coal flow ratio at the burner nozzles. Thus, the opening of the secondary air damper is adjusted according to the actual situation, resulting in some openings being larger and others smaller.

[0075] As can be seen, the embodiments of the present invention disclose a method for adjusting the air distribution of a pulverized coal boiler, and obtaining the furnace outlet air distribution.

[0076] The system collects flue gas temperature data from multiple measuring points and operating parameters of the pulverized coal boiler. These operating parameters include at least one of the following: unit load, coal quality, and pulverizer combination mode. Based on the flue gas temperature data and operating parameters, the system determines the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field. The system compares and analyzes the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field to obtain the comparison analysis results. Based on the comparison analysis results, the system determines whether the combustion state inside the furnace is abnormal. If the combustion state inside the furnace is abnormal, the system determines the change in the furnace flame center position based on the comparison analysis results and adjusts the furnace air distribution accordingly. This allows for real-time tracking of the pulverized coal boiler's operating conditions. Based on the acquired flue gas temperature data and operating parameters, it can effectively identify the combustion state inside the furnace and accurately calculate changes in the flame center position. This enables reasonable adjustments to the furnace air distribution based on the changes in the flame center position, thus avoiding errors in assessing the combustion state inside the furnace and failing to make timely combustion adjustments due to insufficient actual measuring points or data delays. Ultimately, this ensures that the performance and environmental protection indicators of pulverized coal boiler combustion are met.

[0077] In one possible implementation, step S102 of the pulverized coal boiler air distribution adjustment method provided in this application embodiment specifically includes:

[0078] S1021. The initial temperature field prediction model is corrected using the flue gas temperature data to obtain the final temperature field prediction model; wherein, the initial temperature field prediction model is trained by the furnace outlet cross-sectional temperature field samples under different operating conditions, and the furnace outlet cross-sectional temperature field samples are samples under normal combustion conditions inside the furnace.

[0079] The construction process of the initial temperature field prediction model in this embodiment specifically includes: calculating the temperature field samples of the furnace outlet cross section under different working conditions through numerical simulation; training the initial least squares support vector machine model using the temperature field samples of the furnace outlet cross section to obtain the initial temperature field prediction model.

[0080] In one possible implementation, the flue gas temperature sample can be nonlinearly interpolated to obtain a temperature field sample of the furnace outlet cross-section. It is understood that this application can choose different methods for numerical simulation calculations according to actual needs, and no specific limitations are imposed.

[0081] It should be noted that different operating conditions are determined based on different operating parameters. For example, operating parameters include unit load, coal quality, and mill combination. Different unit loads, different coal qualities, and different mill combinations constitute different operating conditions. For instance, the first operating condition is a unit load of 'a', coal quality of type I lignite, and mill combination of mills A, B, and D.

[0082] The first operating condition is as follows: The unit load is 'a', the coal quality is Class II bituminous coal, and the mill combination is a combination of mills A, B, and D, etc. Operating parameters include coal quality, mill combination, and main reheater steam temperature. Different coal qualities, mill combinations, and main reheater steam temperatures constitute different operating conditions. For example, the first operating condition is Class I lignite, with mill combination A, B, and D, and main reheater steam temperature 'b'; the second operating condition is Class II bituminous coal, with mill combination A, B, and D, and main reheater steam temperature 'b', etc. It is understood that the above is merely illustrative and should not be construed as a limitation of this application.

[0083] S1022. Input the operating condition parameters into the final temperature field prediction model to obtain the temperature field of the reference furnace outlet cross section.

[0084] S1023. Input the operating condition parameters and the flue gas temperature data into the final temperature field prediction model to obtain the current furnace outlet cross-sectional temperature field.

[0085] As can be seen, in this embodiment of the application, an initial temperature field prediction model is obtained by training the temperature field samples of the furnace outlet cross section under different operating conditions, and the initial model is corrected by using the flue gas temperature collected in real time. This allows the corrected final temperature field prediction model to obtain an accurate reference furnace outlet cross section temperature field and the current furnace outlet cross section temperature field, thereby enabling the accurate determination of the combustion state in the furnace and the accurate determination of the change in the position of the furnace flame center.

[0086] In one possible implementation, S103 of the pulverized coal boiler air distribution adjustment method provided in this application embodiment specifically includes:

[0087] S1031. Determine the highest temperature point of the current furnace outlet cross-sectional temperature field and the highest temperature point of the reference furnace outlet cross-sectional temperature field.

[0088] S1032. Using the highest temperature point of the current furnace outlet cross-sectional temperature field as the first center, obtain a first temperature distribution curve of the current furnace outlet cross-sectional temperature field along the x-direction; using the highest temperature point of the reference furnace outlet cross-sectional temperature field as the second center, obtain a second temperature distribution curve of the reference furnace outlet cross-sectional temperature field along the x-direction; or, using the highest temperature point of the current furnace outlet cross-sectional temperature field as the first center, obtain a first temperature distribution curve of the current furnace outlet cross-sectional temperature field along the y-direction; using the highest temperature point of the reference furnace outlet cross-sectional temperature field as the second center, obtain a second temperature distribution curve of the reference furnace outlet cross-sectional temperature field along the y-direction.

[0089] See Figure 5 This is a schematic diagram of temperature distribution disclosed in an embodiment of this application, and a first temperature.

[0090] Distribution curve and schematic diagram of the second temperature distribution curve. Figure 5 The left sub-figure shows a partial temperature distribution diagram of the furnace outlet cross-section, centered on the highest temperature point of the furnace outlet cross-section temperature field and extending outwards by a certain distance R. The highest temperature point in this figure gradually decreases along the x and y directions. The current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field can both obtain their corresponding partial temperature distribution diagrams in this way. Figure 5 The right sub-figure shows the temperature distribution curves corresponding to the temperature distribution along the x-direction in the temperature distribution diagram. The first temperature distribution curve corresponds to the temperature field of the current furnace outlet cross-section, and the second temperature distribution curve corresponds to the temperature field of the reference furnace outlet cross-section. There is a deviation between the first temperature distribution curve and the second temperature distribution curve.

[0091] S1033. Calculate the average deviation between the first temperature distribution curve and the second temperature distribution curve to obtain the deviation result between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field.

[0092] For example: The first and second temperature distribution curves are obtained along the x-direction. The highest temperature point on the first temperature distribution curve is at coordinate 0, with a temperature of 1060℃. The highest temperature point on the second temperature distribution curve is at coordinate 0, with a temperature of 1000℃. Therefore, (1060-1000) / 1000 = 6%, yielding a first deviation result of 6%. The coordinate of temperature point 1 on the first temperature distribution curve is 1, with a temperature of 1055℃. The coordinate of temperature point 1 on the second temperature distribution curve is 1, with a temperature of 997℃. Therefore, (1055-997) / 997 ≈ 5.8%, yielding a second deviation result of 5.8%. The coordinate of temperature point 2 on the first temperature distribution curve is -1, with a temperature of 1054℃. The coordinate of temperature point 2 on the second temperature distribution curve is -1, with a temperature of 995℃. Therefore, (1054-995) / 995 ≈ 5.9%, yielding a third deviation result of 5.9%. The temperature deviations of multiple temperature points at the same coordinates on the first and second temperature distribution curves are obtained in the same manner. Then, the average value of the temperature deviations at these multiple temperature points is calculated to obtain the final deviation between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field. For example, if (6% + 5.8% + 5.9%) = 5.9%, then the deviation between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field is 5.9%. It should be understood that the above is merely an illustrative example and should not be construed as a limitation of this application.

[0093] As can be seen, in this embodiment of the application, the average deviation between the first temperature distribution curve corresponding to the current furnace outlet cross-sectional temperature field and the second temperature distribution curve corresponding to the reference furnace outlet cross-sectional temperature field can be calculated to obtain an accurate deviation result between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field. This enables the accurate determination of the combustion state in the furnace, the accurate determination of the change in the furnace flame center position, and the reasonable adjustment of the air distribution of the pulverized coal boiler.

[0094] See Figure 6 This is a flowchart of another method for adjusting the air distribution of a pulverized coal boiler, as disclosed in an embodiment of the present invention. The data acquisition module acquires the flue gas temperature at the furnace outlet in real time and reads other parameters from the DCS; the data processing module calculates the temperature field of the furnace outlet cross-section based on the flue gas temperature data acquired from each measuring point; the database module stores the numerical simulation calculation results under different operating conditions and performs calibration to obtain a reference temperature field; the data analysis module compares and analyzes the furnace cross-sectional temperature at each measuring point with the reference value to determine whether the combustion inside the furnace is abnormal; if the combustion inside the furnace is normal, the original damper opening is maintained unchanged; if the combustion inside the furnace is abnormal, the execution module adjusts the furnace according to the location of the combustion center.

[0095] See Figure 7The present invention discloses a schematic diagram of a pulverized coal boiler air distribution adjustment device, which includes:

[0096] The acquisition unit 701 is used to acquire flue gas temperature data and operating parameters of the pulverized coal boiler from multiple measuring points at the furnace outlet; the operating parameters include at least one of the following: unit load, coal quality, and coal mill combination mode;

[0097] The determining unit 702 is used to determine the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field based on the flue gas temperature data and the operating condition parameters.

[0098] The comparison and analysis unit 703 is used to compare and analyze the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field to obtain the comparison and analysis results.

[0099] The judgment unit 704 is used to determine whether the combustion state inside the furnace is abnormal based on the comparison analysis results.

[0100] The adjustment unit 705 is used to determine the change in the position of the furnace flame center based on the comparison analysis results if the combustion state inside the furnace is abnormal, and to adjust the furnace air distribution based on the change in the position of the furnace flame center.

[0101] As can be seen, this invention discloses a pulverized coal boiler air distribution adjustment device. The acquisition unit is used to acquire flue gas temperature data from multiple measuring points at the furnace outlet and the operating parameters of the pulverized coal boiler. These operating parameters include at least one of the following: unit load, coal quality, and pulverizer combination mode. The determination unit is used to determine the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field based on the flue gas temperature data and operating parameters. The comparison and analysis unit is used to compare and analyze the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field to obtain the comparison and analysis results. The judgment unit is used to judge whether the combustion state inside the furnace is abnormal based on the comparison and analysis results. The adjustment unit is used to determine the change in the furnace flame center position based on the comparison and analysis results if the combustion state inside the furnace is abnormal, and adjusts the adjustment according to the furnace...

[0102] The change in the position of the flame center in the furnace is used to adjust the air distribution in the furnace. This allows for real-time tracking of the pulverized coal boiler's operating conditions. Based on the acquired flue gas temperature data and operating parameters, the combustion state inside the furnace can be identified in real time and effectively. The change in the flame center position can be accurately calculated, and the air distribution in the furnace can be reasonably adjusted accordingly. This avoids the problems of incorrect assessment of the combustion state and failure to make timely combustion adjustments caused by insufficient actual measuring points or data delays, thus ensuring that the performance and environmental protection indicators of pulverized coal boiler combustion are met.

[0103] In one possible implementation, the determining unit 702 in the pulverized coal boiler air distribution adjustment device provided in this embodiment specifically includes:

[0104] The correction unit is used to correct the initial temperature field prediction model using the flue gas temperature data to obtain the final temperature field prediction model; wherein, the initial temperature field prediction model is trained by the furnace outlet cross-sectional temperature field samples under different operating conditions, and the furnace outlet cross-sectional temperature field samples are samples under normal combustion conditions in the furnace.

[0105] A subunit is defined to input the operating condition parameters into the final temperature field prediction model to obtain the temperature field of the reference furnace outlet cross section.

[0106] The sub-unit is also used to input the operating condition parameters and the flue gas temperature data into the final temperature field prediction model to obtain the current furnace outlet cross-sectional temperature field.

[0107] In one possible implementation, the pulverized coal boiler air distribution adjustment device provided in this embodiment further includes a building unit; the building unit specifically includes:

[0108] The numerical simulation unit is used to obtain samples of the temperature field of the furnace outlet cross section under different operating conditions through numerical simulation.

[0109] The training unit is used to train the initial least squares support vector machine model using the temperature field samples of the furnace outlet cross section to obtain the initial temperature field prediction model.

[0110] In one possible implementation, the comparison analysis results in the pulverized coal boiler air distribution adjustment device provided in this embodiment include: the deviation results between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field. The adjustment unit 705 specifically includes:

[0111] The flame center determination unit is used to determine that the position of the furnace flame center is slightly moved upward if the deviation result is greater than a first preset value and less than or equal to a second preset value.

[0112] The flame center determination unit is also used to determine that the position of the furnace flame center has been significantly moved upward if the deviation result is greater than the second preset value.

[0113] In one possible implementation, the adjustment unit 705 in the pulverized coal boiler air distribution adjustment device provided in this embodiment of the application further includes:

[0114] The adjustment subunit is used to reduce the proportion of burnout air and increase the air coefficient of the main combustion zone of the furnace if the center of the flame in the furnace moves up slightly.

[0115] The adjustment subunit is also used to shut down the uppermost coal mill and close the uppermost primary air supply if the center of the furnace flame shifts significantly upwards, while maintaining combustion in the lower burners.

[0116] In one possible implementation, the pulverized coal boiler air distribution adjustment device provided in this embodiment includes the comparison analysis results as follows: the deviation between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field. The adjustment unit 705 is further used for:

[0117] If the deviation result is greater than the third preset value and less than or equal to the first preset value, then increase the speed of the dynamic separator, and / or increase the hydraulic loading force of the medium-speed mill, and / or level the primary air-powder pipe, and / or adjust the opening of the secondary air damper.

[0118] In one possible implementation, the air distribution adjustment device for a pulverized coal boiler provided in this embodiment includes the comparison analysis results as follows: the deviation between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field. The comparison analysis unit 703 specifically includes:

[0119] Temperature point determination unit, used to determine the highest temperature point of the current furnace outlet cross-sectional temperature field and the highest temperature point of the reference furnace outlet cross-sectional temperature field;

[0120] The curve acquisition unit is used to acquire a first temperature distribution curve of the current furnace outlet cross-sectional temperature field along the x-direction, with the highest temperature point of the current furnace outlet cross-sectional temperature field as the first center; and to acquire a second temperature distribution curve of the reference furnace outlet cross-sectional temperature field along the x-direction, with the highest temperature point of the reference furnace outlet cross-sectional temperature field as the second center; or, to acquire a first temperature distribution curve of the current furnace outlet cross-sectional temperature field along the y-direction, with the highest temperature point of the current furnace outlet cross-sectional temperature field as the first center; and to acquire a second temperature distribution curve of the reference furnace outlet cross-sectional temperature field along the y-direction, with the highest temperature point of the reference furnace outlet cross-sectional temperature field as the second center.

[0121] The calculation unit is used to calculate the average deviation between the first temperature distribution curve and the second temperature distribution curve, and to obtain the deviation result between the current furnace outlet cross-sectional temperature field and the reference furnace outlet cross-sectional temperature field.

[0122] Furthermore, this application embodiment also provides a pulverized coal boiler air distribution adjustment device, including: a processor, a memory, and a system bus;

[0123] The processor and the memory are connected via the system bus;

[0124] The memory is used to store one or more programs, the one or more programs including instructions, which, when executed by the processor, cause the processor to perform any of the above-described implementation methods of the pulverized coal boiler air distribution adjustment method.

[0125] Furthermore, embodiments of this application also provide a computer-readable storage medium storing instructions that, when executed on a terminal device, cause the terminal device to perform any of the above-described methods for adjusting the air distribution of a pulverized coal boiler.

[0126] Furthermore, this application embodiment also provides a computer program product, which, when run on a terminal device, causes the terminal device to execute any of the above-described methods for adjusting the air distribution of a pulverized coal boiler.

[0127] It should be noted that the specific working principles of each component in the device embodiment can be found in the corresponding sections of the method embodiment, and will not be repeated here.

[0128] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0129] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0130] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of adjusting air distribution in a pulverized coal boiler, characterized by, The method comprises: acquiring flue gas temperature data of multiple measuring points at the furnace outlet and operating condition parameters of the pulverized coal boiler; the operating condition parameters comprise at least one of the following: unit load, coal quality, and mill combination mode; determining a current furnace outlet cross-section temperature field and a reference furnace outlet cross-section temperature field according to the flue gas temperature data and the operating condition parameters; wherein the determination of the current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field according to the flue gas temperature data and the operating condition parameters comprises: correcting an initial temperature field prediction model by using the flue gas temperature data to obtain a final temperature field prediction model; wherein the initial temperature field prediction model is obtained by training furnace outlet cross-section temperature field samples under different conditions, and the furnace outlet cross-section temperature field samples are samples under normal combustion state in the furnace; the construction process of the initial temperature field prediction model comprises: obtaining furnace outlet cross-section temperature field samples under different conditions by numerical simulation; and training an initial least squares support vector machine model by using the furnace outlet cross-section temperature field samples to obtain the initial temperature field prediction model; inputting the operating condition parameters into the final temperature field prediction model to obtain the reference furnace outlet cross-section temperature field; inputting the operating condition parameters and the flue gas temperature data into the final temperature field prediction model to obtain the current furnace outlet cross-section temperature field; comparing and analyzing the current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field to obtain a comparison and analysis result; judging whether the combustion state in the furnace is abnormal according to the comparison and analysis result; if the combustion state in the furnace is abnormal, determining a change of the center position of the furnace flame according to the comparison and analysis result, and adjusting the air distribution of the furnace according to the change of the center position of the furnace flame.

2. The method of claim 1, wherein, The comparison and analysis result comprises a deviation result of the current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field, and the determination of the change of the center position of the furnace flame according to the comparison and analysis result comprises: if the deviation result is greater than a first preset value and less than or equal to a second preset value, determining that the center position of the furnace flame is slightly upwardly moved; if the deviation result is greater than the second preset value, determining that the center position of the furnace flame is greatly upwardly moved.

3. The method of claim 2, wherein, The adjustment of the air distribution of the furnace according to the change of the center position of the furnace flame comprises: if the center position of the furnace flame is slightly upwardly moved, reducing the proportion of the overfire air and increasing the air coefficient of the main combustion zone of the furnace; if the center position of the furnace flame is greatly upwardly moved, stopping the operation of the uppermost mill, closing the uppermost primary air, and keeping the combustion of the lower burner.

4. The method of claim 1, wherein, The comparison and analysis result comprises a deviation result of the current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field, and the method further comprises: if the deviation result is greater than a third preset value and less than or equal to a first preset value, increasing the rotational speed of the dynamic separator, and / or increasing the hydraulic loading force of the medium-speed mill, and / or adjusting the primary air powder pipe to be flat, and / or adjusting the opening degree of the secondary air baffle door.

5. The method of claim 1, the alignment analysis results comprising: The deviation result of the current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field, the comparison and analysis of the current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field, and the comparison and analysis result, include: determining the highest temperature point of the current furnace outlet cross-section temperature field and the highest temperature point of the reference furnace outlet cross-section temperature field; taking the highest temperature point of the current furnace outlet cross-section temperature field as a first center, obtaining a first temperature distribution curve of the current furnace outlet cross-section temperature field along the x direction; or taking the highest temperature point of the current furnace outlet cross-section temperature field as a first center, obtaining a first temperature distribution curve of the current furnace outlet cross-section temperature field along the y direction; taking the highest temperature point of the reference furnace outlet cross-section temperature field as a second center, obtaining a second temperature distribution curve of the reference furnace outlet cross-section temperature field along the y direction; calculating the average deviation between the first temperature distribution curve and the second temperature distribution curve to obtain the deviation result of the current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field.

6. A coal powder boiler air distribution adjusting device, characterized by, The device includes: The acquisition unit is configured to acquire flue gas temperature data of a plurality of measuring points at a furnace outlet and operating condition parameters of a pulverized coal boiler; the operating condition parameters include at least one of the following: unit load, coal quality, and mill combination mode; The determination unit is configured to determine a current furnace outlet cross-section temperature field and a reference furnace outlet cross-section temperature field according to the flue gas temperature data and the operating condition parameters. The determination of the current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field according to the flue gas temperature data and the operating condition parameters includes: The initial temperature field prediction model is corrected by using the flue gas temperature data to obtain a final temperature field prediction model; wherein the initial temperature field prediction model is obtained by training furnace outlet cross-section temperature field samples under different conditions, and the furnace outlet cross-section temperature field samples are samples under normal combustion state in the furnace; The construction process of the initial temperature field prediction model includes: obtaining furnace outlet cross-section temperature field samples under different conditions through numerical simulation; and training an initial least squares support vector machine model by using the furnace outlet cross-section temperature field samples to obtain an initial temperature field prediction model; The operating condition parameters are input into the final temperature field prediction model to obtain the reference furnace outlet cross-section temperature field; The operating condition parameters and the flue gas temperature data are input into the final temperature field prediction model to obtain the current furnace outlet cross-section temperature field; The comparison and analysis unit is configured to compare and analyze the current furnace outlet cross-section temperature field and the reference furnace outlet cross-section temperature field to obtain a comparison and analysis result. The judgment unit is configured to determine whether the combustion state in the furnace is abnormal according to the comparison and analysis result. An adjusting unit is configured to determine a change of a furnace flame center position according to the comparison analysis result if the combustion state in the furnace is abnormal, and to adjust the air distribution of the furnace according to the change of the furnace flame center position.

7. A device for adjusting air distribution in a pulverized coal boiler, characterized in that The device comprises a processor, a memory, and a system bus; The processor and the memory are connected through the system bus; The memory is configured to store one or more programs, the one or more programs comprising instructions that, when executed by the processor, cause the processor to perform the coal powder boiler air distribution adjustment method of any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores instructions, and when the instructions run on the terminal device, the terminal device performs the coal powder boiler air distribution adjustment method of any one of claims 1 to 5.

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