Method for treating adhesion of early coking of hearth by acoustic fatigue
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUADIAN YILI COAL POWER CO LTD
- Filing Date
- 2026-06-01
- Publication Date
- 2026-08-07
AI Technical Summary
[0005]因此，现有技术存在声波处理时机不精准、不同区域处理参数针对性不足、早期结焦可处理窗口容易错过的问题
[0042] 1. This application uses an early coking risk index to screen early breakable coking zones and limits the timing of acoustic treatment to the stage when ash and slag initially adhere but have not yet hardened. This can improve the effectiveness of acoustic treatment for early coking in the furnace and reduce the risk of coking continuing to accumulate and harden.
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Figure CN122523637A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of coking control technology in coal-fired boiler furnaces, specifically a method for treating acoustic fatigue-induced coking in early-stage furnaces. Background Technology
[0002] During the operation of a coal-fired boiler, ash particles produced by pulverized coal combustion move within the furnace along with the high-temperature flue gas. When the local furnace temperature is high, the ash melting characteristics are mismatched with the combustion environment, or a reducing atmosphere or flame adhesion exists in a localized area, molten or semi-molten ash particles easily adhere to the water-cooled walls or other heated surfaces, gradually forming an initial coking layer. As the boiler continues to operate, this initial coking layer continues to trap ash particles and unburned coke, eventually developing into a thicker and harder coke lump.
[0003] In existing technologies, furnace coking is typically diagnosed through methods such as abnormal furnace temperature, elevated flue gas temperature, changes in wall heat load, pressure differential, manual observation, or furnace shutdown inspection. These methods often have a certain lag, and treatment is usually only carried out after the coking has formed a considerable thickness or even hardened.
[0004] While existing acoustic soot blowing or other online coking methods can treat some of the accumulated ash or coking, their acoustic frequency, sound source pressure, and duration are mostly fixed or empirical values. They usually do not distinguish between the ash and slag adhesion stage, the semi-sintering stage, and the hardened coke stage, nor do they determine targeted acoustic fatigue breaking parameters based on factors such as changes in wall heat transfer in different furnace zones, coal ash softening temperature, reducing atmosphere, ash and alkaline component content, and sound field propagation attenuation.
[0005] Therefore, existing technologies suffer from problems such as inaccurate timing of acoustic wave processing, insufficient targeting of processing parameters for different regions, and easy miss of the processing window for early coking. Summary of the Invention
[0006] The technical problem to be solved by this application is: how to identify early-stage coking zones that can be broken before the early coking in the furnace hardens, based on furnace operation data, coal quality data and wall heat transfer data, and to convert the coking risk, equivalent deposition amount, ash and coke adhesion strength and sound field propagation attenuation of the zone into acoustic fatigue breaking parameters, so as to achieve directional, appropriate and closed-loop treatment of the early coking area in the furnace.
[0007] The present application provides a method for treating early coking in a furnace caused by acoustic fatigue and adhesion breaking, which adopts the following technical solution: including: S1, dividing the furnace water-cooled wall into multiple treatment zones, and acquiring furnace operation data, coal quality data, wall heat transfer data, reference heat transfer data and sound source arrangement information corresponding to each treatment zone;
[0008] S2, Calculate the early coking risk index of each processing zone based on the furnace operation data, coal quality data, wall heat transfer data and reference heat transfer data;
[0009] S3, Based on the early coking risk index, determine the early breakable sticky zone from multiple processing zones;
[0010] S4. Based on the wall heat transfer data and the reference heat transfer data, the wall heat transfer change and the furnace temperature data are determined to determine the equivalent deposition amount of the early brittle zone.
[0011] S5. Based on the equivalent deposition amount, coal ash softening temperature, and reducing atmosphere data characterized by oxygen content and carbon monoxide content, determine the ash and coke adhesion strength evaluation value of the early breakable adhesion zone.
[0012] S6, determine the propagation distance from the sound source to the early breakable adhesive zone based on the sound source arrangement information, and determine the effective sound pressure reaching the early breakable adhesive zone based on the propagation distance and the furnace sound attenuation coefficient;
[0013] S7, determine the acoustic fatigue equivalent cyclic stress acting on the ash and coke deposit layer based on the effective sound pressure;
[0014] S8. Determine the number of cycles required for acoustic fatigue failure based on the ash adhesion strength evaluation value and the acoustic fatigue equivalent cyclic stress.
[0015] S9, determine the duration of action based on the number of cycles and the frequency of sound waves, and generate sound wave action parameters, which include at least the sound source sound pressure, sound wave frequency, duration of action, and sound source combination;
[0016] S10, Perform acoustic fatigue breaking treatment on the early breakable adhesive zone according to the acoustic wave action parameters;
[0017] S11: Obtain feedback data after acoustic fatigue debonding treatment, and correct subsequent acoustic wave action parameters based on the changes in wall heat transfer or early coking risk index after treatment.
[0018] The furnace operation data includes the processing zone temperature, oxygen content, carbon monoxide content, and near-wall flue gas velocity; the coal quality data includes the ash content of the coal entering the furnace, the ash softening temperature, and the sodium and calcium content in the ash; the wall heat transfer data includes the heat load of the processing zone wall; the reference heat transfer data includes the reference heat load of the clean wall under the same load and the reference temperature under the same load clean state; the sound source arrangement information includes the sound pressure of the sound source, the sound source location, the reference distance, and the sound source combination.
[0019] The early coking risk index is determined according to the following formula:
[0020]
[0021] in, To address the early coking risk index of the zone, To handle zone temperature, ST is the coal ash softening temperature. The baseline thermal load for a clean wall surface under the same load is... To handle the heat load on the partition walls, To process the carbon monoxide content corresponding to the partition, This is the baseline value for carbon monoxide. The ash content of the coal entering the furnace. The ash content is the baseline value, and Na and Ca are the evaluation values for sodium and calcium content in coal ash, respectively. This is the baseline value for alkaline components. to These are the weighting coefficients.
[0022] Set a first risk threshold and a second risk threshold, where the first risk threshold is less than the second risk threshold; when the early coking risk index of the processing zone is greater than or equal to the first risk threshold and less than the second risk threshold, the processing zone is identified as an early breakable coking zone; when the early coking risk index of the processing zone is greater than or equal to the second risk threshold, output a combustion adjustment, routine soot blowing, or manual inspection prompt.
[0023] The equivalent deposition amount is determined according to the following formula:
[0024]
[0025] in, This represents the equivalent deposition amount of the early, viscous-breakable zone. The baseline thermal load for a clean wall surface under the same load is... For the early stage of breaking the viscous partition wall heat load, This is the temperature at which early-stage, viscous partitions can be broken. The reference temperature is the same as the clean temperature under the same load. and These are calibration coefficients.
[0026] The ash and coke adhesion strength evaluation value is determined according to the following formula:
[0027]
[0028] in, This is the evaluation quantity for ash and coke adhesion strength corresponding to the stress dimension. For equivalent sediment volume, ST represents the early stage of the breakable viscous zone temperature, and ST represents the coal ash softening temperature. The carbon monoxide content corresponds to the early, breakable viscous zone. Na and Ca are the evaluation values for sodium and calcium content in coal ash, respectively. to These are calibration coefficients.
[0029] Furthermore, the effective sound pressure is determined according to the following formula:
[0030]
[0031] in, To achieve the effective sound pressure level of the early, breakable viscous zone, The sound pressure level of the sound source. For reference distance, The equivalent propagation distance from the sound source to the early breakable zone is denoted by α, and α is the sound attenuation coefficient under the high-temperature flue gas environment in the furnace.
[0032] The acoustic fatigue equivalent cyclic stress is determined based on the effective sound pressure level, and the acoustic fatigue equivalent cyclic stress is determined according to the following formula:
[0033]
[0034] in, The equivalent cyclic stress for acoustic fatigue. This is the proportionality coefficient for the conversion of sound pressure into cyclic stress in the sedimentary layer. To achieve the effective sound pressure level of the early, breakable viscous zone, is the acoustic coupling coefficient.
[0035] Furthermore, the number of cycles required for the acoustic fatigue failure is determined according to the following formula:
[0036]
[0037] in, The number of cycles required for acoustic fatigue-induced adhesion breakdown. As the baseline number of iterations, This is the evaluation quantity for ash and coke adhesion strength corresponding to the stress dimension. The stress is the equivalent cyclic stress for acoustic fatigue, and m is the fatigue index; the duration of the action is determined according to the following formula:
[0038]
[0039] in, Duration of action The frequency is the sound wave frequency; when the acoustic fatigue equivalent cyclic stress is less than the effective breaking stress threshold... At that time, adjust the sound pressure and combination of the sound sources.
[0040] After the acoustic fatigue debonding treatment is completed, the heat load of the treated zone wall, the temperature of the treated zone, and the early coking risk index are obtained. The heat load recovery amount is determined based on the difference in wall heat load before and after treatment, the temperature drop amount is determined based on the difference in temperature of the treated zone before and after treatment, and the risk index reduction amount is determined based on the difference in early coking risk index before and after treatment. When the heat load recovery amount reaches a preset heat load recovery threshold, or the risk index reduction amount reaches a preset risk reduction threshold, the acoustic fatigue debonding treatment is considered complete. When the heat load recovery amount does not reach the preset heat load recovery threshold, and the risk index reduction amount does not reach the preset risk reduction threshold, the acoustic energy coupling coefficient is corrected, and the subsequent acoustic wave action parameters are re-determined based on the corrected acoustic energy coupling coefficient.
[0041] The beneficial effects of this application are as follows:
[0042] 1. This application uses an early coking risk index to screen early breakable coking zones and limits the timing of acoustic treatment to the stage when ash and slag initially adhere but have not yet hardened. This can improve the effectiveness of acoustic treatment for early coking in the furnace and reduce the risk of coking continuing to accumulate and harden.
[0043] 2. This application transforms data such as furnace temperature, wall heat load, coal ash softening temperature and reducing atmosphere into an evaluation metric for acoustic fatigue breaking of adhesion by using equivalent deposition amount and ash adhesion strength evaluation value, so that acoustic processing no longer depends on fixed empirical parameters.
[0044] 3. This application calculates the effective sound pressure based on the propagation distance from the sound source to the target zone and the furnace sound attenuation coefficient, which can compensate for the sound field propagation attenuation in the high-temperature flue gas environment of the furnace and improve the pertinence of sound wave processing parameters in different zones.
[0045] 4. This application determines the duration of acoustic wave action by using the equivalent cyclic stress of acoustic fatigue and the number of cycles required to break the adhesion, so that the acoustic wave treatment process matches the fatigue failure mechanism of the ash and coke adhesion layer, which helps to reduce insufficient or excessive action.
[0046] 5. This application uses the amount of heat load recovery, temperature drop, or risk index decrease to provide feedback correction for acoustic parameters, which can form a closed-loop control process of identification-calculation-processing-feedback, thereby improving the adaptability of early coking treatment under long-term furnace operation conditions. Attached Figure Description
[0047] Appendix Figure 1 This is a schematic flowchart of a method for treating early coking in a furnace that causes fatigue and adhesion.
[0048] Appendix Figure 2 This is a schematic diagram of the water-cooled wall treatment zone in the furnace of this application.
[0049] Appendix Figure 3This is a schematic diagram of the feedback correction process after acoustic fatigue failure treatment in this application. Detailed Implementation
[0050] The following is in conjunction with the appendix Figures 1 to 3 This application will be described in further detail below. It should be noted that the following embodiments are used to illustrate the technical solution of this application and are not intended to limit the scope of protection of this application.
[0051] This embodiment discloses a method for treating early-stage coking in a furnace using acoustic fatigue breaking, applicable to the early-stage coking of water-cooled walls in coal-fired boilers. Early-stage coking refers to the formation of an initial adhesion layer on the surface of the water-cooled wall by ash particles, but this initial adhesion layer has not yet been continuously sintered, compacted, and developed into hardened coke lumps. In this state, the adhesion interface between the ash / coke deposit layer and the water-cooled wall surface is still susceptible to damage from cyclic acoustic pressure disturbances. Therefore, this embodiment does not perform uniform acoustic blowing after severe coking, but rather, after identifying early-stage breakable zones, calculates acoustic wave action parameters based on the coking risk, equivalent deposition amount, ash / coke adhesion strength, and sound field propagation attenuation of each zone, and then uses acoustic fatigue to perform directional breaking treatment on the early-stage adhesion interface.
[0052] The method in this embodiment can be implemented using a boiler operation control system, a coal quality online monitoring system, a furnace heat flux density detection system, a furnace coking visualization model, and a water-cooled wall anti-coking acoustic curtain protection system. Specifically, the boiler operation control system provides operational data such as furnace load, air volume, oxygen content, carbon monoxide content, and burner operating status; the coal quality online monitoring system provides coal quality data such as ash content of the incoming coal, ash softening temperature, sodium content, and calcium content; the furnace heat flux density detection system provides wall heat load data at different locations on the water-cooled wall; the furnace coking visualization model outputs the furnace temperature field, near-wall flue gas velocity, reducing atmosphere distribution, and coking risk distribution; and the water-cooled wall anti-coking acoustic curtain protection system performs acoustic fatigue breaking treatment on the target area according to the calculated acoustic wave action parameters.
[0053] Reference Figure 1 and Figure 2 First, the furnace water-cooled wall is divided into multiple processing zones according to its height and circumference. These processing zones are denoted as:
[0054]
[0055] Where i represents the partition number in the height direction of the furnace, and j represents the partition number in the circumferential direction of the furnace. For example, the water-cooled wall of the furnace can be divided along the height direction into the lower burner area, the main combustion area, the burnout area, and the area near the furnace outlet, and along the circumferential direction into the front wall, rear wall, left wall, and right wall; more refined partitioning can also be made according to the actual furnace structure, burner arrangement, and the location of heat flux density measurement points.
[0056] For each processing partition Get the temperature of the processing partition corresponding to this processing partition. Wall heat load Oxygen content Carbon monoxide content Near-wall flue gas velocity Ash content of coal entering the furnace The evaluation values for sodium (Na) and calcium (Ca) content in coal ash, as well as the coal ash softening temperature (ST), are provided. These data can be obtained from the boiler operation control system, online coal quality monitoring system, furnace heat flux density detection system, furnace coking visualization model, or furnace three-dimensional combustion calculation model.
[0057] After obtaining the above data, an early coking risk index is calculated for each processing partition:
[0058]
[0059] in, The baseline thermal load for a clean wall surface under the same load is... This is the baseline value for carbon monoxide. This is the baseline value for ash content. This is the baseline value for alkaline components. to Let be the weighting coefficients, and satisfy:
[0060]
[0061] The early coking risk index is used to characterize the likelihood of the formation of an initial adhesion layer within a treatment zone. The closer the temperature of the treatment zone is to or exceeds the coal ash softening temperature, the more significant the decrease in wall heat load, the higher the carbon monoxide content, and the higher the ash and sodium-calcium content, the higher the early coking risk of that treatment zone.
[0062] After calculating the early coking risk index, a first risk threshold is set. Second risk threshold ,in:
[0063]
[0064]
[0065]
[0066] When a processing zone meets the following formula, it indicates that the zone may have entered a stage of severe deposition or hardening coking. In this case, early acoustic fatigue debonding treatment should not be prioritized. Instead, output combustion adjustment, routine soot blowing, enhanced inspection, or furnace shutdown inspection should be performed.
[0067]
[0068] By setting the two thresholds mentioned above, this embodiment limits the acoustic processing target to the early-stage debonding window, avoiding ineffective processing of areas where no deposits have formed, and also avoiding the application of the early debonding method to areas of large coke blocks that have already hardened.
[0069]
[0070]
[0071] in, The reference temperature is the same as the clean temperature under the same load. and The calibration coefficient is used. The equivalent deposition amount does not require the direct measurement of the true thickness of the deposition layer. Instead, it is characterized by a comprehensive assessment of the reduction in wall heat load and local temperature deviation, which reveals the degree of heat transfer attenuation by the ash deposition layer, the trend of deposition layer thickness, and the density of the deposition layer.
[0072]
[0073]
[0074] in, to The calibration coefficient is used. The ash-coke adhesion strength evaluation value is used to characterize the adhesion difficulty between the ash-coke deposit layer and the water-cooled wall surface in the early breakable adhesion zone. The higher the equivalent deposition amount, the more significant the weakening of heat transfer by the deposit layer; the greater the range by which the temperature of the treatment zone exceeds the coal ash softening temperature, the higher the possibility that the ash is in a molten or semi-molten state; the higher the carbon monoxide content, the more obvious the local reducing atmosphere, and the higher the risk of coal ash melting and adhesion; the higher the sodium and calcium content, the stronger the tendency to form low-melting-point deposits.
[0075]
[0076]
[0077] in, To achieve the effective sound pressure level of the early, breakable viscous zone, The sound pressure level of the sound source. For reference distance, The equivalent propagation distance from the sound source to the early breakable viscous zone is given by α, where α is the sound attenuation coefficient under the high-temperature flue gas environment in the furnace. This step takes into account the geometric diffusion of sound waves inside the furnace and the absorption and attenuation by high-temperature dust-laden flue gas, avoiding the direct use of the sound pressure at the sound source outlet as the actual sound pressure in the target area.
[0078]
[0079]
[0080] in, The equivalent cyclic stress for acoustic fatigue. This is the proportionality coefficient for the conversion of sound pressure into cyclic stress in the sedimentary layer. The acoustic coupling coefficient is used to characterize the effectiveness of acoustic energy conversion to the adhesion interface of the ash deposit layer after the sound wave enters the target zone.
[0081]
[0082]
[0083] in, The angle between the incident direction of the sound wave and the normal to the water-cooled wall. For the early-stage, viscous-breakable near-wall flue gas velocity, to This is the calibration coefficient. By introducing the acoustic energy coupling coefficient, the adaptability of the acoustic wave action parameters to different furnace regions can be improved.
[0084]
[0085]
[0086] in, The number of cycles required for acoustic fatigue-induced adhesion breakdown. Here, is the baseline number of cycles, and m is the fatigue index. This formula indicates that: the higher the ash adhesion strength evaluation value, the more cycles are required to complete the breakup; and the higher the acoustic fatigue equivalent cyclic stress, the fewer cycles are required to complete the breakup.
[0087] When the equivalent cyclic stress of acoustic fatigue satisfies the following formula, it indicates that the current acoustic wave action is insufficient to form effective adhesion breakdown, where, For effective viscous stress threshold:
[0088]
[0089] At this time, the sound pressure level of the sound source can be increased. Adjust the sound source combination, change the incident direction of the sound waves, or reselect the processing mode. If increasing the sound source sound pressure or adjusting the sound source combination still cannot meet the effective adhesion breaking conditions, then this round of acoustic fatigue adhesion breaking processing will not be executed, and other clearing strategies will be prompted.
[0090]
[0091]
[0092] in, Duration of action The frequency of the sound wave.
[0093] The sound wave frequency can be set to the lower limit of the preset frequency. and preset frequency limit The preset frequency range can be selected from among these. In one embodiment, the preset frequency range can be:
[0094]
[0095] During the frequency selection process, it is possible to and Multiple candidate frequencies are selected, and the comprehensive evaluation value corresponding to each candidate frequency is calculated separately:
[0096]
[0097] Wherein, G(f) is the comprehensive evaluation value corresponding to the candidate frequency f. (f) represents the acoustic coupling coefficient at candidate frequency f, L(f) represents the acoustic field attenuation loss at candidate frequency f, and λ represents the loss weight. The candidate frequency with the largest comprehensive evaluation value is determined as the acoustic frequency. .
[0098]
[0099]
[0100] in, For the set of parameters of sound wave action, For early-stage, unbreakable adhesive partitions, The sound pressure level of the sound source. For sound wave frequency, Duration of action This refers to a combination of sound sources or a sound wave delivery mode.
[0101] Reference Figure 3 The water-cooled wall anti-coking acoustic curtain protection system is based on the set of acoustic wave action parameters. Acoustic fatigue debonding treatment was applied to the early-stage debonding zones. During the treatment, acoustic waves created periodic pressure disturbances on the target water-cooled wall surface, subjecting the adhesion interface between the ash and coke deposits and the water-cooled wall surface to cyclic loading. When the cyclic loading reached the calculated number of cycles, fatigue cracks, interface peeling, or local loosening occurred at the adhesion interface of the ash and coke deposits. The early-stage adhesion layer detached from the water-cooled wall surface and was subsequently carried away by the flue gas or fell into the furnace bottom collection area under gravity.
[0102] After the acoustic fatigue debonding treatment was completed, the post-treatment temperature, post-treatment wall heat load, and post-treatment early coking risk index of the treated zone were re-acquired and recorded as follows: , and Based on the data before and after the treatment, the amount of heat load recovery, the amount of temperature drop, and the amount of risk index decrease were calculated:
[0103]
[0104]
[0105]
[0106]
[0107]
[0108]
[0109] in, To preset the heat load recovery threshold, This is a preset risk reduction threshold.
[0110] When the heat load recovery amount does not reach the preset heat load recovery threshold, and the risk index decrease does not reach the preset risk decrease threshold, it indicates that the acoustic wave action parameters have failed to achieve the expected viscosity-breaking effect. In this case, the acoustic energy coupling coefficient is corrected.
[0111]
[0112] in, This is the corrected acoustic coupling coefficient. For correction factor, The target risk index is set. After correction, the equivalent cyclic stress of acoustic fatigue, the number of cycles required for adhesion breakdown, and the duration of action are recalculated, and the parameters for the next round of acoustic wave action are generated.
[0113] In a specific operational example, the boiler is operating at medium to high load, and the furnace coking visualization model shows a processing zone of the main combustion area on the rear wall. A combination of characteristics was observed: increased temperature, decreased wall heat load, and increased carbon monoxide content. The system acquired the processing zone temperature for this area. Wall heat load Carbon monoxide content Near-wall flue gas velocity And in combination with the ash content of the coal currently being fed into the furnace. Calculate the early coking risk index for this zone based on the sodium content evaluation value (Na), calcium content evaluation value (Ca), and coal ash softening temperature (ST). If the risk index is at the first risk threshold. Second risk threshold In between, It was determined to be an early-stage, breakable adhesive partition.
[0114] Subsequently, the system calculates the equivalent deposition amount based on the change in heat load of the treated zone wall relative to the baseline heat load of a clean wall under the same load, and the change in temperature of the treated zone relative to the baseline temperature of a clean state under the same load. The system calculates the effective sound pressure reaching the target zone based on the equivalent propagation distance between the target zone and the sound source, the sound pressure from the source, and the sound attenuation coefficient α, and then calculates the acoustic fatigue equivalent cyclic stress. After confirming that the acoustic fatigue equivalent cyclic stress reaches the effective debonding stress threshold, the system calculates the number of cycles required for debonding and, combined with the selected frequency, calculates the duration of action, ultimately generating a set of acoustic wave action parameters. The water-cooled wall anti-coking sound curtain protection system performs directional acoustic fatigue debonding treatment on the main combustion zone of the rear wall according to this parameter set.
[0115] After processing, the system retrieves the data again. The wall heat load, temperature, and early coking risk index are calculated, and the heat load recovery, temperature drop, and risk index decrease are calculated. If the heat load recovery or risk index decrease reaches the corresponding threshold, the early adhesion layer of the zone is considered to have been effectively destroyed; if it does not reach the corresponding threshold, the acoustic coupling coefficient is corrected, and the next round of processing is performed under the condition that the safe sound pressure and safe action time are not exceeded.
[0116] Through the above implementation methods, this application can further transform the results of the visual assessment of coking in the furnace into executable parameters for acoustic fatigue debonding, enabling the acoustic processing to change from timed, value-based, and experience-based commissioning to a closed-loop processing of zone identification, quantitative calculation, and feedback correction. At the same time, this application focuses on processing the early debonding zones that have not yet hardened, which can destroy the ash and coke adhesion interface before the coking develops into hard coke blocks, thereby reducing the risk of large-area coking on the water-cooled walls.
[0117] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A method for treating fatigue-induced debonding caused by early coking in a furnace, characterized in that, include: S1, divide the furnace water-cooled wall into multiple processing zones, and acquire furnace operation data, coal quality data, wall heat transfer data, reference heat transfer data and sound source layout information corresponding to each processing zone; S2, Calculate the early coking risk index of each processing zone based on the furnace operation data, coal quality data, wall heat transfer data and reference heat transfer data; S3, Based on the early coking risk index, determine the early breakable sticky zone from multiple processing zones; S4. Based on the wall heat transfer data and the reference heat transfer data, the wall heat transfer change and the furnace temperature data are determined to determine the equivalent deposition amount of the early brittle zone. S5. Based on the equivalent deposition amount, coal ash softening temperature, and reducing atmosphere data characterized by oxygen content and carbon monoxide content, determine the ash and coke adhesion strength evaluation value of the early breakable adhesion zone. S6, determine the propagation distance from the sound source to the early breakable adhesive zone based on the sound source arrangement information, and determine the effective sound pressure reaching the early breakable adhesive zone based on the propagation distance and the furnace sound attenuation coefficient; S7, determine the acoustic fatigue equivalent cyclic stress acting on the ash and coke deposit layer based on the effective sound pressure; S8. Determine the number of cycles required for acoustic fatigue failure based on the ash adhesion strength evaluation value and the acoustic fatigue equivalent cyclic stress. S9, determine the duration of action based on the number of cycles and the frequency of sound waves, and generate sound wave action parameters, which include at least the sound source sound pressure, sound wave frequency, duration of action, and sound source combination; S10, Perform acoustic fatigue breaking treatment on the early breakable adhesive zone according to the acoustic wave action parameters; S11: Obtain feedback data after acoustic fatigue debonding treatment, and correct subsequent acoustic wave action parameters based on the changes in wall heat transfer or early coking risk index after treatment.
2. The method for treating fatigue-induced debonding caused by early coking in the furnace according to claim 1, characterized in that: The furnace operation data includes the processing zone temperature, oxygen content, carbon monoxide content, and near-wall flue gas velocity; the coal quality data includes the ash content of the coal entering the furnace, the ash softening temperature, and the sodium and calcium content in the ash; the wall heat transfer data includes the heat load of the processing zone wall; the reference heat transfer data includes the reference heat load of the clean wall under the same load and the reference temperature under the same load clean state; the sound source arrangement information includes the sound pressure of the sound source, the sound source location, the reference distance, and the sound source combination.
3. The method for treating early-stage coking and fatigue-induced debonding in the furnace according to claim 2, characterized in that: The early coking risk index is determined according to the following formula: in, To address the early coking risk index of the zone, To handle zone temperature, ST is the coal ash softening temperature. The baseline thermal load for a clean wall surface under the same load is... To handle the heat load on the partition walls, To process the carbon monoxide content corresponding to the partition, This is the baseline value for carbon monoxide. The ash content of the coal entering the furnace. The ash content is the baseline value, and Na and Ca are the evaluation values for sodium and calcium content in coal ash, respectively. This is the baseline value for alkaline components. to These are the weighting coefficients.
4. The method for treating fatigue-induced debonding caused by early coking in the furnace according to claim 3, characterized in that: Set a first risk threshold and a second risk threshold, wherein the first risk threshold is less than the second risk threshold; When the early coking risk index of a processing zone is greater than or equal to the first risk threshold and less than the second risk threshold, the processing zone is identified as an early coking zone that can be broken; when the early coking risk index of a processing zone is greater than or equal to the second risk threshold, a combustion adjustment, routine soot blowing, or manual inspection prompt is output.
5. The method for treating early-stage coking and fatigue-induced debonding in the furnace according to claim 1 or 2, characterized in that: The equivalent deposition amount is determined according to the following formula: in, This represents the equivalent deposition amount of early-stage, viscous-breakable zones. The baseline thermal load for a clean wall surface under the same load is... For the early stage of heat load on the wall surface of the viscous partition, This is the temperature at which early-stage, viscous partitions can be broken. The reference temperature is the same as the clean temperature under the same load. and These are calibration coefficients.
6. The method for treating early-stage coking and fatigue-induced debonding in the furnace according to claim 5, characterized in that: The ash and coke adhesion strength evaluation value is determined according to the following formula: in, This is the evaluation quantity for ash and coke adhesion strength corresponding to the stress dimension. For equivalent sediment volume, ST represents the early stage of the breakable viscous zone temperature, and ST represents the coal ash softening temperature. The carbon monoxide content corresponds to the early, breakable viscous zone. Na and Ca are the evaluation values for sodium and calcium content in coal ash, respectively. to These are calibration coefficients.
7. The method for treating early-stage coking and fatigue-induced debonding in the furnace according to claim 1 or 2, characterized in that: The effective sound pressure is determined according to the following formula: in, To achieve the effective sound pressure level of the early, breakable viscous zone, The sound pressure level of the sound source. For reference distance, The equivalent propagation distance from the sound source to the early breakable zone is denoted by α, and α is the sound attenuation coefficient under the high-temperature flue gas environment in the furnace.
8. The method for treating fatigue-induced debonding caused by early coking in the furnace according to claim 7, characterized in that: The acoustic fatigue equivalent cyclic stress is determined based on the effective sound pressure level, and the acoustic fatigue equivalent cyclic stress is determined according to the following formula: in, The equivalent cyclic stress for acoustic fatigue. This is the proportionality coefficient for the conversion of sound pressure into cyclic stress in the sedimentary layer. The acoustic-energy coupling coefficient; The acoustic coupling coefficient is determined according to the following formula: in, This represents the equivalent deposition amount of early-stage, viscous-breakable zones. The angle between the incident direction of the sound wave and the normal to the water-cooled wall. For the early-stage, viscous-breakable near-wall flue gas velocity, to These are calibration coefficients.
9. The method for treating fatigue-induced debonding caused by early coking in the furnace according to claim 8, characterized in that: The number of cycles required for acoustic fatigue-induced adhesion breakdown is determined according to the following formula: in, The number of cycles required for acoustic fatigue-induced adhesion breakdown. As the baseline number of iterations, This is the evaluation quantity for ash and coke adhesion strength corresponding to the stress dimension. The stress is the equivalent cyclic stress for acoustic fatigue, and m is the fatigue index; the duration of the action is determined according to the following formula: in, For duration of action, The frequency is the sound wave frequency; when the acoustic fatigue equivalent cyclic stress is less than the effective breaking stress threshold... At that time, adjust the sound pressure and combination of the sound sources.
10. The method for treating early-stage coking and fatigue-induced debonding in the furnace according to claim 1, characterized in that: After the acoustic fatigue breaking treatment is completed, the heat load of the treatment zone wall, the temperature of the treatment zone, and the early coking risk index are obtained. The heat load recovery amount is determined based on the difference in wall heat load before and after treatment, the temperature drop amount is determined based on the difference in temperature of the treatment zone before and after treatment, and the risk index reduction amount is determined based on the difference in early coking risk index before and after treatment. When the heat load recovery amount reaches the preset heat load recovery threshold, or the risk index decrease amount reaches the preset risk decrease threshold, the acoustic fatigue failure treatment is determined to be completed. When the heat load recovery amount does not reach the preset heat load recovery threshold and the risk index decrease amount does not reach the preset risk decrease threshold, the acoustic coupling coefficient is corrected, and the subsequent acoustic wave action parameters are re-determined based on the corrected acoustic coupling coefficient.