Method and device for determining a soot blowing strategy of a soot blower of a coal-fired boiler, and electronic device

Abstract

The present disclosure relates to a method and device for determining a soot blowing strategy of a soot blower of a coal-fired boiler and an electronic device, and relates to the field of coal-fired power generation. The method comprises: first, obtaining working condition data of the coal-fired boiler unit, wherein the working condition data comprises a unit load and a plurality of parameter values of a heating surface of the boiler; then, according to the working condition data and a set evaluation index, evaluating soot blowing effects of a plurality of pairs of soot blowers in the coal-fired boiler unit to obtain a comprehensive evaluation result of the plurality of pairs of soot blowers; and finally, determining a soot blowing strategy of the plurality of pairs of soot blowers in the unit according to the comprehensive evaluation result. Through the technical solution, the soot blowing effects of the soot blowers of the coal-fired boiler can be obtained by using the working condition data of the coal-fired boiler unit and the set evaluation index, and then the soot blowing strategy of the soot blowers can be adjusted according to the soot blowing effects, so that the overblowing or underblowing situation in the soot blowing process can be avoided.

Description

Technical Field

[0001] This disclosure relates to the field of coal-fired power generation, and more specifically, to a method, apparatus, and electronic equipment for determining the soot blowing strategy of a coal-fired boiler soot blower. Background Technology

[0002] During the operation of coal-fired power plants, ash easily accumulates on the heating surfaces of coal-fired boilers, requiring soot blowers (coal-fired power plants typically use long telescopic steam soot blowers) to remove ash. The soot blowing process generally has a fixed blowing frequency, but this method cannot evaluate the actual soot blowing effect. Long-term adherence to this fixed frequency may lead to over-blowing or under-blowing, affecting production. Therefore, obtaining the actual soot blowing effect and adjusting the soot blowing strategy accordingly has become an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this disclosure is to provide a method, apparatus, and electronic equipment for determining the soot blowing strategy of a coal-fired boiler soot blower, in order to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a method for determining a soot blowing strategy for a coal-fired boiler soot blower, the method comprising: Obtain operating condition data of the coal-fired boiler unit; the operating condition data includes unit load and multiple parameter values ​​of the boiler's heating surface; Based on the operating data and the set evaluation indicators, the soot blowing effect of multiple pairs of soot blowers in the coal-fired boiler unit is evaluated, and the comprehensive evaluation result of the multiple pairs of soot blowers is obtained. The soot blowing strategy for multiple pairs of soot blowers within the unit is determined based on the comprehensive evaluation results.

[0005] Optionally, the evaluation of the sootblowing effect of multiple pairs of sootblowers in the coal-fired boiler unit based on the operating condition data and set evaluation indicators, to obtain a comprehensive evaluation result of the multiple pairs of sootblowers, includes: Based on the operating data and set evaluation indicators, the single-blow soot blowing effect of the multiple pairs of soot blowers is evaluated to obtain the first evaluation result of the multiple pairs of soot blowers; wherein, the multiple parameter values ​​of the boiler's heating surface include one or more of the following: heating surface heat, heating surface inlet flue gas temperature, heating surface outlet flue gas temperature, heating surface inlet steam temperature, and heating surface outlet steam temperature; the set evaluation indicators include the heating surface heat change value, the heating surface outlet flue gas temperature change value, and the heating surface outlet steam temperature change value. The soot blowing effect of multiple heating surfaces on different types of flues is evaluated to obtain a second evaluation result; wherein each of the multiple heating surfaces is provided with at least one pair of soot blowers; The comprehensive evaluation result of the multiple pairs of soot blowers is obtained based on the first evaluation result and the second evaluation result.

[0006] Optionally, the step of evaluating the single-blow sootblowing effect of the multiple pairs of sootblowers based on the operating condition data and set evaluation indicators to obtain a first evaluation result for the multiple pairs of sootblowers includes: Soot blowing is performed sequentially on each pair of soot blowers according to a first soot blowing method; the first soot blowing method is to start each pair of soot blowers sequentially according to a set time interval. Obtain multiple first parameter values ​​of the boiler's heating surface before the soot blowing action of each pair of soot blowers begins; the first parameter values ​​include: heat of the first heating surface, flue gas temperature at the outlet of the first heating surface, and steam temperature at the outlet of the first heating surface; Acquire multiple second parameter values ​​of the boiler's heating surface after the soot blowing action of each pair of soot blowers stops; the second parameter values ​​include: heat of the second heating surface, flue gas temperature at the outlet of the second heating surface, and steam temperature at the outlet of the second heating surface; Based on the plurality of first parameter values ​​and the plurality of second parameter values, a plurality of first evaluation indicators corresponding to the plurality of pairs of soot blowers are determined respectively. The first evaluation indicators include the heat change value of the first heating surface, the flue gas temperature change value of the first heating surface outlet, and the steam temperature change value of the first heating surface outlet. The first evaluation results of the multiple pairs of soot blowers are obtained based on the multiple first evaluation indicators.

[0007] Optionally, obtaining the first evaluation result of the plurality of pairs of sootblowers based on the plurality of first evaluation indicators includes: By standardizing and weighting the change values ​​of heat from the first heating surface, the change values ​​of flue gas temperature at the outlet of the first heating surface, and the change values ​​of steam temperature at the outlet of the first heating surface in any of the first evaluation indicators, a pair of feature quantities for evaluating the effect of the sootblower corresponding to the first evaluation indicator are obtained. The blowing effect of the multiple pairs of soot blowers is ranked according to the characteristic quantity of each pair of soot blowers to obtain a first ranking result of the multiple pairs of soot blowers, and the first ranking result is used as the first evaluation result.

[0008] Optionally, the different types of flue zones include horizontal flues and tail flues. The evaluation of the soot blowing effect on multiple heated surfaces on each of the different types of flues to obtain a second evaluation result includes: The plurality of heated surfaces are blown with soot according to a second soot blowing method; the second soot blowing method is to blow soot sequentially according to the positional distribution of the soot blowers on the heated surfaces. Obtain multiple second evaluation indicators corresponding to the multiple heating surfaces, the second evaluation indicators including the heat change value of the second heating surface, the flue gas temperature change value at the outlet of the second heating surface, and the steam temperature change value at the outlet of the second heating surface; The second evaluation results of the multiple heated surfaces are obtained based on the multiple second evaluation indicators.

[0009] Optionally, obtaining the second evaluation result of the plurality of heated surfaces based on the plurality of second evaluation indicators includes: By standardizing and weighting the heat change value of the second heating surface, the flue gas temperature change value of the second heating surface outlet, and the steam temperature change value of the second heating surface outlet in any of the second evaluation indicators, a characteristic quantity for evaluating the soot blowing effect of a heating surface corresponding to the second evaluation indicator is obtained. The multiple heated surfaces are sorted by their soot blowing effect according to the characteristic quantity of each heated surface, and a second sorting result is obtained. The second sorting result is used as the second evaluation result.

[0010] Optionally, obtaining the comprehensive evaluation result of the multiple pairs of sootblowers based on the first evaluation result and the second evaluation result includes: Based on the first ranking result in the first evaluation result and the second ranking result in the second evaluation result, a comprehensive ranking method for the multiple pairs of soot blowers is obtained, and the comprehensive ranking method is used as the comprehensive evaluation result.

[0011] Optionally, determining the soot blowing strategy for multiple pairs of soot blowers within the unit based on the comprehensive evaluation results includes: The number of soot blowers that need to be started is determined based on the load conditions of the coal-fired boiler unit; Based on the number of soot blowers that need to be activated, the soot blowers are activated in the order of the comprehensive ranking method in the comprehensive evaluation results.

[0012] Optionally, acquiring the operating condition data of the coal-fired boiler unit includes: Obtain the original operating condition data of the coal-fired boiler unit; The original heating surface temperature data in the original operating condition data is filtered and denoised to obtain operating condition data containing optimized heating surface temperature data, which is used as the operating condition data of the coal-fired boiler unit; wherein, the heating surface temperature data includes one or more of the following: heating surface inlet flue gas temperature, heating surface outlet flue gas temperature, heating surface inlet steam temperature, and heating surface outlet steam temperature.

[0013] A second aspect of this disclosure provides a soot blowing strategy apparatus for a coal-fired boiler soot blower, the apparatus comprising: The acquisition module is used to acquire the operating condition data of the coal-fired boiler unit; the operating condition data includes the unit load and multiple parameter values ​​of the boiler's heating surface; The evaluation module is used to evaluate the soot blowing effect of multiple pairs of soot blowers in the coal-fired boiler unit based on the operating data and set evaluation indicators, and to obtain a comprehensive evaluation result of the multiple pairs of soot blowers. The determination module is used to determine the soot blowing strategy for multiple pairs of soot blowers in the unit based on the comprehensive evaluation results.

[0014] A third aspect of this disclosure provides an electronic device, including: A memory on which computer programs are stored; A processor for executing the computer program in the memory to implement the steps of the method according to any one of the first aspects of this disclosure.

[0015] In the above technical solution, the operating condition data of the coal-fired boiler unit is first acquired. This data includes the unit load and multiple parameter values ​​of the boiler's heating surface. Then, based on this operating condition data and set evaluation indicators, the sootblowing effect of multiple pairs of sootblowers within the coal-fired boiler unit is evaluated, resulting in a comprehensive evaluation result. Finally, the sootblowing strategy for the multiple pairs of sootblowers within the unit is determined based on this comprehensive evaluation result. This technical solution utilizes the operating condition data of the coal-fired boiler unit and set evaluation indicators to obtain the sootblowing effect of the coal-fired boiler sootblowers. Adjusting the sootblowing strategy based on this effect can then avoid over-blowing or under-blowing during the sootblowing process.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower for a coal-fired boiler, according to an exemplary embodiment.

[0018] Figure 2 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower for a coal-fired boiler, according to an exemplary embodiment.

[0019] Figure 3 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower for a coal-fired boiler, according to an exemplary embodiment.

[0020] Figure 4This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower for a coal-fired boiler, according to an exemplary embodiment.

[0021] Figure 5 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower for a coal-fired boiler, according to an exemplary embodiment.

[0022] Figure 6 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower for a coal-fired boiler, according to an exemplary embodiment.

[0023] Figure 7 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower for a coal-fired boiler, according to an exemplary embodiment.

[0024] Figure 8 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower for a coal-fired boiler, according to an exemplary embodiment.

[0025] Figure 9 This is a schematic diagram illustrating the correspondence between a heated surface and a soot blower according to an exemplary embodiment.

[0026] Figure 10 This is a block diagram illustrating a soot blowing strategy determination device for a coal-fired boiler soot blower according to an exemplary embodiment.

[0027] Figure 11 This is a block diagram illustrating an electronic device 1100 according to an exemplary embodiment.

[0028] Figure 12 This is a block diagram illustrating an electronic device 1200 according to an exemplary embodiment.

[0029] Explanation of reference numerals in the attached figures A - Partition screen superheater; B - Final stage reheater; C - Final stage superheater; D - Low-temperature reheater; E - Low-temperature superheater; F - Economizer; 1 to 15 - Soot blowers. Detailed Implementation

[0030] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0031] It should be noted that all actions involving the acquisition of signals, information, or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with authorization from the owner of the relevant device.

[0032] To address the problem of ash accumulation on the heating surfaces of boilers, steam is typically used as the soot blowing medium in coal-fired power plants. Long telescopic steam soot blowers are generally used. However, the soot blowing effect of long telescopic soot blowers lacks effective measurement points and algorithms for evaluation in the distributed control system (DCS) of the unit. Long-term soot blowing at a fixed frequency often leads to overblowing or underblowing, resulting in excessive loss of soot blowing steam or damage to the heating surface tube walls.

[0033] The applicant discovered that sootblowers may experience a series of problems during long-term use, such as hardware aging, spray angle deviation, and water carryover in the sootblowing steam. These issues lead to variations in sootblowing performance between different sootblowers. Therefore, to achieve good sootblowing results, conventional sootblowing strategies cannot be simply followed; adjustments must be made based on the performance of each sootblower. Consequently, obtaining the actual sootblowing effect and adjusting the sootblowing strategy accordingly has become a pressing issue. To address these technical problems, this disclosure proposes a method for determining the sootblowing strategy of a coal-fired boiler sootblower, which is described below with reference to the accompanying drawings.

[0034] Figure 1 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower in a coal-fired boiler, according to an exemplary embodiment. Figure 1 As shown, the method includes the following steps: In step S11, the operating condition data of the coal-fired boiler unit is obtained; the operating condition data includes the unit load and multiple parameter values ​​of the boiler's heating surface.

[0035] The heating surfaces of the boiler may include screen-type superheaters, final stage superheaters, final stage reheaters, low-temperature superheaters, low-temperature reheaters, and economizers.

[0036] In step S12, based on the operating data and the set evaluation indicators, the soot blowing effect of multiple pairs of soot blowers in the coal-fired boiler unit is evaluated, and the comprehensive evaluation result of the multiple pairs of soot blowers is obtained.

[0037] For example, the evaluation indicators may include the change in heat of the heating surface, the change in flue gas temperature at the outlet of the heating surface, and the change in steam temperature at the outlet of the heating surface.

[0038] In step S13, the soot blowing strategy for multiple pairs of soot blowers in the unit is determined based on the comprehensive evaluation results.

[0039] For example, the activation priority of multiple pairs of sootblowers can be determined based on the comprehensive evaluation results, thereby determining the sootblowing strategy in the actual sootblowing process according to the activation priority.

[0040] In the above technical solution, the operating condition data of the coal-fired boiler unit is first acquired. This data includes the unit load and multiple parameter values ​​of the boiler's heating surface. Then, based on this operating condition data and set evaluation indicators, the sootblowing effect of multiple pairs of sootblowers within the coal-fired boiler unit is evaluated, resulting in a comprehensive evaluation result. Finally, the sootblowing strategy for the multiple pairs of sootblowers within the unit is determined based on this comprehensive evaluation result. This technical solution utilizes the operating condition data of the coal-fired boiler unit and set evaluation indicators to obtain the sootblowing effect of the coal-fired boiler sootblowers. Adjusting the sootblowing strategy based on this effect can then avoid over-blowing or under-blowing during the sootblowing process.

[0041] Figure 2 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower in a coal-fired boiler, according to an exemplary embodiment. Figure 2 As shown, obtaining the operating condition data of the coal-fired boiler unit in step S11 may include the following steps: Step S111: Obtain the original operating condition data of the coal-fired boiler unit.

[0042] For example, the original operating data of the coal-fired boiler unit may include real-time operating data such as unit load, soot blower start / stop signal data, steam inlet and outlet pressure and heating surface temperature data obtained from the DCS. Among them, the heating surface temperature data may include temperature-related data such as heating surface inlet flue gas temperature, heating surface outlet flue gas temperature, heating surface inlet steam temperature and heating surface outlet steam temperature.

[0043] Step S112: Filter and denoise the original heating surface temperature data in the original operating condition data to obtain operating condition data containing the optimized heating surface temperature data, which is used as the operating condition data of the coal-fired boiler unit.

[0044] It is understandable that the temperature data in the original operating condition data obtained from the DCS will inevitably be accompanied by noise during the data signal acquisition process due to the influence of environmental and instrument factors. Therefore, it is necessary to filter and denoise the temperature data. The processed data can more clearly and intuitively reflect the change range of the sootblower after the sootblowing action.

[0045] It is understandable that a one-dimensional signal model for temperature data containing noise can be represented as:

[0046] In the formula, The original signal; The variance is Gaussian white noise, obeying It follows a normal distribution.

[0047] This disclosure employs a wavelet thresholding denoising algorithm. The algorithm works by setting a threshold value for the wavelet coefficients to distinguish the magnitude of noise in the data signal, extracting and retaining useful signals greater than the threshold, and discarding noise less than the threshold. The algorithm involves the selection of the wavelet basis, the threshold value, and the threshold function.

[0048] Optionally, the wavelet basis can be selected as the db8 wavelet basis, the threshold is a general threshold set to 0.2, and the threshold function is a soft threshold function. Compared with methods such as median filtering and first-order lag filtering, the wavelet thresholding denoising algorithm has no delay and can retain high-frequency signals while removing low-frequency signals. Since the selection of parameters may cause a large deviation between the processed result and the original value, the parameters selected in this algorithm can be adjusted according to the situation of the measurement points in practical applications, and this disclosure does not impose any limitations.

[0049] Optionally, during online calculation, a list of historical temperature measurement points [t0, t1, t2, ..., t] from the current time to a past period can be retrieved. n After wavelet thresholding denoising, the data list [t0] is obtained. w , t1 w , t2 w , ...,t n w ], retrieve the last value t in the data list. n w , which is the temperature value at the current moment.

[0050] After filtering and denoising the temperature-related data, the optimized heating surface temperature data is used as the operating data of the coal-fired boiler unit for subsequent soot blowing effect evaluation.

[0051] Figure 3 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower in a coal-fired boiler, according to an exemplary embodiment. Figure 3 As shown, step S12, which involves evaluating the soot blowing effect of multiple pairs of soot blowers in the coal-fired boiler unit based on the operating data and set evaluation indicators, to obtain a comprehensive evaluation result for the multiple pairs of soot blowers, may include the following steps: Step S121: Based on the working condition data and the set evaluation indicators, evaluate the single-blow effect of the multiple pairs of soot blowers to obtain the first evaluation result of the multiple pairs of soot blowers.

[0052] The boiler's heating surface parameters include one or more of the following: heating surface heat, heating surface inlet flue gas temperature, heating surface outlet flue gas temperature, heating surface inlet steam temperature, and heating surface outlet steam temperature. The evaluation index includes the heating surface heat change value, the heating surface outlet flue gas temperature change value, and the heating surface outlet steam temperature change value.

[0053] Step S122: Evaluate the soot blowing effect of multiple heating surfaces on different types of flues to obtain a second evaluation result; wherein each of the multiple heating surfaces is provided with at least one pair of soot blowers.

[0054] For example, the different types of flues may include horizontal flues and tail flues. The multiple heating surfaces on the horizontal flue may include: partition screen superheaters, final stage reheaters, and final stage superheaters, etc. The multiple heating surfaces on the tail flue may include: low-temperature reheaters, low-temperature superheaters, and economizers, etc.

[0055] Step S123: Obtain the comprehensive evaluation result of the multiple pairs of soot blowers based on the first evaluation result and the second evaluation result.

[0056] It is understandable that the first evaluation result is an evaluation of the soot blowing effect of the soot blowers installed on each heated surface, and the second evaluation result is an evaluation of the soot blowing effect of the heated surface. The two are combined to obtain the comprehensive evaluation result.

[0057] Figure 4 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower in a coal-fired boiler, according to an exemplary embodiment. Figure 4 As shown, step S121, which involves evaluating the single-blow effect of the multiple pairs of sootblowers based on the operating data and set evaluation indicators to obtain the first evaluation result of the multiple pairs of sootblowers, may include the following steps: Step S1211: Soot blowing is performed on each pair of soot blowers in the plurality of pairs of soot blowers in sequence according to the first soot blowing method; the first soot blowing method is to start each pair of soot blowers in sequence according to a set time interval.

[0058] For example, after the preheating preparation work before soot blowing is completed, instead of using the sequential automatic soot blowing mode, each pair of soot blowers is manually started in sequence at set time intervals (e.g., 20 minutes) to perform soot blowing. Only one pair of soot blowers is started at a time. The impact of a single soot blowing can be judged by this soot blowing method.

[0059] Step S1212: Obtain multiple first parameter values ​​of the boiler's heating surface before the soot blowing action of each pair of soot blowers begins; the first parameter values ​​include: heat of the first heating surface, flue gas temperature at the outlet of the first heating surface, and steam temperature at the outlet of the first heating surface.

[0060] Step S1213: Obtain multiple second parameter values ​​of the boiler's heating surface after the soot blowing action of each pair of soot blowers stops; the second parameter values ​​include: heat of the second heating surface, flue gas temperature at the outlet of the second heating surface, and steam temperature at the outlet of the second heating surface.

[0061] For example, data is acquired for a set time (e.g., 5 minutes) before the sootblower start signal, and the average value is used as the first parameter value described in step S1212, namely, the heat of the first heating surface, the flue gas temperature at the outlet of the first heating surface, and the steam temperature at the outlet of the first heating surface; data is acquired for a set time (e.g., 5 minutes) after the sootblower stop signal, and the average value is used as the second parameter value described in step S1213, namely, the heat of the second heating surface, the flue gas temperature at the outlet of the second heating surface, and the steam temperature at the outlet of the second heating surface.

[0062] The formula for calculating the heat of the heated surface is as follows:

[0063] In the formula, Q represents the heat absorbed per unit amount of fuel, and the unit is kJ / kg; This is the enthalpy of the steam at the outlet of the heating surface, expressed in kJ / kg. The enthalpy of the superheated steam can be obtained by consulting a steam property parameter table based on the outlet pressure and temperature of the heating surface. This is the enthalpy of the steam at the inlet of the heating surface, expressed in kJ / kg. This enthalpy can be obtained by consulting a table of steam properties based on the inlet temperature and pressure of the heating surface. V represents the feedwater flow rate, measured in t / h. This value can be obtained in real time through the DCS. If the real-time value is missing, the main steam flow rate can be used instead. To calculate fuel consumption, the unit is t / h, which can be replaced by the total coal feed rate, which can be obtained in real time through the DCS.

[0064] The steam temperature at the outlet of the heating surface can be obtained from the DCS, and the flue gas temperature at the outlet of the heating surface can be calculated from the flue gas temperature at the inlet of the low-temperature reheater.

[0065] Step S1214: Determine multiple first evaluation indicators corresponding to the multiple pairs of soot blowers based on the multiple first parameter values ​​and the multiple second parameter values. The first evaluation indicators include the heat change value of the first heating surface, the flue gas temperature change value at the outlet of the first heating surface, and the steam temperature change value at the outlet of the first heating surface.

[0066] For example, the change value of the first heating surface is obtained based on the difference in heat absorption of the first heating surface and the second heating surface; the change value of the flue gas temperature at the outlet of the first heating surface is obtained based on the difference in flue gas temperature at the outlet of the second heating surface; and the change value of the steam temperature at the outlet of the first heating surface is obtained based on the difference in steam temperature at the outlet of the first heating surface and the steam temperature at the outlet of the second heating surface. Under normal circumstances, the heat absorption of the heating surfaces will increase before and after soot blowing, the outlet flue gas temperature will decrease, and the outlet steam temperature will increase.

[0067] Step S1215: Obtain the first evaluation results of the multiple pairs of soot blowers based on the multiple first evaluation indicators.

[0068] For example, Figure 5 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower in a coal-fired boiler, according to an exemplary embodiment. Figure 5 As shown, step S1215 may include the following steps: Step S12151: By standardizing and weighting the change values ​​of heat from the first heating surface, the change values ​​of flue gas temperature at the outlet of the first heating surface, and the change values ​​of steam temperature at the outlet of the first heating surface in any of the first evaluation indicators, characteristic quantities for evaluating the effect of a pair of soot blowers corresponding to the first evaluation indicator are obtained.

[0069] Step S12152: Sootblowers are sorted by their sootblowing effect according to the characteristic quantity of each pair of sootblowers in the multiple pairs of sootblowers, and a first sorting result of the multiple pairs of sootblowers is obtained. The first sorting result is used as the first evaluation result.

[0070] It can be understood that, since the various evaluation indicators are of different orders of magnitude, they need to be standardized to the same range for comparison, and the evaluation indicators need to be positively evaluated. The specific processing method is as follows: Assume that any given heated surface corresponds to n soot blowers, and there are 3 evaluation indicators forming a data matrix:

[0071] The maximum value V of the j-th evaluation index j,max For [x 1j , … , x nj The maximum value of ]; The minimum value V of the j-th evaluation index j,min For [x 1j , … , x nj The minimum value of ]; For the two evaluation indicators, the change in heat absorption of the heating surface and the change in steam temperature at the outlet of the heating surface, the larger the value, the better. The standardized formula is as follows:

[0072] For the evaluation index of flue gas temperature change at the outlet of the heated surface, a larger value is better. The standardized formula is as follows:

[0073] After standardizing the evaluation indicators, considering the volatility and conflict of the data, a weight analysis of each indicator is necessary. For example, the weight of the j-th evaluation indicator is:

[0074] in, The calculation formula is:

[0075] To evaluate the volatility of the indicator, the calculation formula is as follows:

[0076] This is the average value of the j-th evaluation index after standardization of these n soot blowers.

[0077]

[0078] To evaluate the contradictions in the indicators, the calculation formula is as follows:

[0079] The correlation coefficient between the i-th indicator and the j-th indicator is calculated using the following formula:

[0080] Understandably, after standardizing and positively processing the evaluation index, we can obtain a pair of feature quantities corresponding to the sootblower effect of that evaluation index. For example, the feature quantity of the sootblowing effect of the i-th sootblower can be:

[0081] according to The multiple pairs of soot blowers on the heated surface are evaluated and ranked to obtain the first ranking result of the multiple pairs of soot blowers. The first ranking result can be used as the first evaluation result.

[0082] Figure 6 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower in a coal-fired boiler, according to an exemplary embodiment. Figure 6 As shown, the evaluation of the soot blowing effect on multiple heated surfaces on different types of flues, as described in step S122, to obtain a second evaluation result, may include the following steps: Step S1221: Soot blowing is performed on multiple heated surfaces according to the second soot blowing method; the second soot blowing method is to blow soot sequentially according to the position distribution of soot blowers on the heated surfaces.

[0083] For example, when evaluating the heating surfaces on a horizontal flue, soot blowing can be performed from front to back according to the location distribution of the soot blowers. After all soot blowers have completed soot blowing, the soot blowing effect can be evaluated, thereby obtaining the impact of this soot blowing on each heating surface.

[0084] Step S1222: Obtain multiple second evaluation indicators corresponding to the multiple heating surfaces. The second evaluation indicators include the heat change value of the second heating surface, the flue gas temperature change value at the outlet of the second heating surface, and the steam temperature change value at the outlet of the second heating surface.

[0085] Step S1223: Obtain the second evaluation results of multiple heated surfaces based on the multiple second evaluation indicators.

[0086] Figure 7 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower in a coal-fired boiler, according to an exemplary embodiment. Figure 7 As shown, step S1223 may further include the following steps: Step S12231: By standardizing and weighting the heat change value of the second heating surface, the flue gas temperature change value of the second heating surface outlet, and the steam temperature change value of the second heating surface outlet in any of the second evaluation indicators, a characteristic quantity for evaluating the soot blowing effect of a heating surface corresponding to the second evaluation indicator is obtained. Step S12232: Soot blowing effect is sorted according to the characteristic quantity of each of the multiple heated surfaces to obtain a second sorting result of the multiple heated surfaces, and the second sorting result is used as the second evaluation result.

[0087] Understandably, the method for determining the second evaluation result is similar to that for the first evaluation result, and will not be repeated here. It should be noted that, due to the high flue gas temperature at the location of the horizontal flue and the insufficient number of flue gas temperature measurement points, the flue gas temperature at the turning chamber can be used in conjunction with the principle of heat balance for back-calculation during the evaluation process to obtain the flue gas temperature at the outlet of the heated surface.

[0088] Optionally, the comprehensive evaluation result of the multiple pairs of soot blowers obtained in step S123 above, based on the first evaluation result and the second evaluation result, may include: Based on the first ranking result in the first evaluation result and the second ranking result in the second evaluation result, the comprehensive ranking method of the multiple pairs of soot blowers is obtained, and the comprehensive ranking method is used as the comprehensive evaluation result.

[0089] Understandably, the first evaluation result reflects the ranking of multiple pairs of sootblowers in each heating surface, while the second evaluation result reflects the ranking of each heating surface. Combining the two ranking results yields a comprehensive ranking of multiple pairs of sootblowers.

[0090] Figure 8 This is a flowchart illustrating a method for determining the soot blowing strategy of a soot blower in a coal-fired boiler, according to an exemplary embodiment. Figure 8 As shown, step S13, which involves determining the soot blowing strategy for multiple pairs of soot blowers within the unit based on the comprehensive evaluation result, may include the following steps: Step S131: Determine the number of soot blowers that need to be started based on the load of the coal-fired boiler unit; Step S132: Based on the number of soot blowers that need to be activated, activate the soot blowers in the order of the comprehensive ranking method in the comprehensive evaluation results.

[0091] Understandably, considering energy conservation, in actual production, the number of sootblowers to be activated can be determined based on the unit load, thus achieving on-demand sootblowing. For example, when the unit is operating at high load, the number of sootblowers to be activated can be all the sootblowers; when the unit is operating at medium load, the number of sootblowers to be activated can be 70% of the total number of sootblowers; and when the unit is operating at low load, the number of sootblowers to be activated can be 50% of the total number of sootblowers.

[0092] Based on the number of soot blowers that need to be activated, the soot blowers should be activated in the order of the comprehensive ranking method in the comprehensive evaluation results.

[0093] Then the soot blowing action is performed. Soot blowers that have not yet been blown will continue to be blown in their original order, while soot blowers that have already been started will be reordered and placed at the back.

[0094] In the above technical solution, the operating condition data of the coal-fired boiler unit is first acquired. This data includes the unit load and multiple parameter values ​​of the boiler's heating surface. Then, based on this operating condition data and set evaluation indicators, the sootblowing effect of multiple pairs of sootblowers within the coal-fired boiler unit is evaluated, resulting in a comprehensive evaluation result. Finally, the sootblowing strategy for the multiple pairs of sootblowers within the unit is determined based on this comprehensive evaluation result. This technical solution utilizes the operating condition data of the coal-fired boiler unit and set evaluation indicators to obtain the sootblowing effect of the coal-fired boiler sootblowers. Adjusting the sootblowing strategy based on this effect can then avoid over-blowing or under-blowing during the sootblowing process.

[0095] The above method will be described below with reference to specific embodiments: In one possible implementation, the coal-fired power plant has 9 pairs (18 units) of long telescopic steam sootblowers in the horizontal flue and 6 pairs (12 units) of long telescopic steam sootblowers in the low-temperature superheater area of ​​the tail flue, for a total of 15 pairs of sootblowers. Each pair of sootblowers is located on both the left and right sides. The heating surfaces of the horizontal flue include the partition screen superheater, the final stage superheater, and the final stage reheater, while the heating surfaces of the tail flue include the low-temperature superheater, the low-temperature reheater, and the economizer. Figure 9 This is a schematic diagram illustrating the correspondence between a heated surface and a soot blower according to an exemplary embodiment, such as... Figure 9As shown, A, B, C, D, E and F represent the above 6 heating surfaces: partition screen superheater, final stage reheater, final stage superheater, low temperature reheater, low temperature superheater and economizer, and 1-15 represent the above 15 pairs of soot blowers.

[0096] Based on the soot blowing strategy determination method for a coal-fired boiler provided in this disclosure, the soot blowing effect of the long telescopic soot blower for the coal-fired boiler is evaluated, including the following steps: (1) Obtain real-time data of unit operation and perform data processing.

[0097] For example, real-time data on unit operation is acquired through the DCS. This real-time data may include parameters such as: inlet and outlet steam temperatures of the partition superheater, inlet and outlet steam temperatures of the final stage superheater, inlet and outlet steam temperatures of the final stage reheater, inlet and outlet steam temperatures of the low-temperature superheater, inlet and outlet steam temperatures of the low-temperature reheater, inlet and outlet steam temperatures of the economizer, inlet and outlet flue gas temperatures of the low-temperature reheater, inlet and outlet flue gas temperatures of the low-temperature superheater, outlet flue gas temperature of the economizer, feedwater flow rate, coal feed rate, and sootblower start-up or retraction signals. The real-time data is filtered using a wavelet threshold denoising algorithm.

[0098] (2) Evaluate the effect of a single blowing.

[0099] First, the soot blowers are grouped according to their heated surfaces.

[0100] Group 1: Soot blowers corresponding to superheater A of the partition screen are 1, 2, 3, and 4; Group 2: Soot blowers corresponding to the final stage reheater B are 2, 3, 4, 5, and 6; Group 3: The soot blowers corresponding to the final stage superheater C are 5, 6, 7, 8, and 9; Group 4: The soot blowers corresponding to the low-temperature superheater E are 10, 11, 12, 13, 14, and 15.

[0101] Secondly, according to the preceding text Figures 3-5 In a specific implementation of the embodiment, the evaluation results of all sootblowers corresponding to each heating surface are obtained. For example, for a partition screen superheater, the evaluation indicators of the sootblower corresponding to that heating surface can be formed into an evaluation table as shown in Table 1. The evaluation tables for the other heating surfaces can also be obtained as shown in Table 1. It should be noted that specific data are not shown in Table 1, but are only used to illustrate that when evaluating the sootblower corresponding to the partition screen superheater, at least three dimensions of data need to be considered: the change in heat absorption, the change in outlet steam temperature, and the change in outlet flue gas temperature. The specific values ​​of the heat change, the change in outlet steam temperature, and the change in outlet flue gas temperature can be measured from actual scenarios, and this embodiment does not impose any limitations.

[0102] Table 1. Evaluation Table of Soot Blowers Corresponding to Separator Superheaters

[0103] Finally, by standardizing and weighting the evaluation indicators, the characteristic quantities of the sootblowing effect for each pair of sootblowers can be obtained. (i=1-15), sort multiple pairs of soot blowers according to this feature.

[0104] For example, the sorting results of multiple pairs of soot blowers corresponding to the above four groups of heated surfaces can be as follows: The soot blower sequence corresponding to the superheater A of the partition screen is: 3-1-2-4; The soot blower sequence corresponding to the final stage reheater B is: 4-2-6-5-3; The soot blower sequence corresponding to the final stage superheater C is: 6-9-8-5-7; The soot blower sequence corresponding to the low-temperature superheater E is: 14-12-13-15-10-11.

[0105] (3) Evaluate the soot blowing effect of the heated surface.

[0106] The evaluation was conducted independently in two parts: the horizontal flue and the tail flue. Since the tail flue only has a sootblower for the low-temperature superheater and only one heating surface, the overall evaluation result for the sootblower in the tail flue is 14-12-13-15-10-11. (Based on the previous text...) Figure 7 and Figure 8 The specific implementation methods in this embodiment evaluate the heating surfaces corresponding to the partition screen superheater, the final reheater, and the final superheater in the horizontal flue, resulting in the evaluation table shown in Table 2. It should be noted that specific data is not shown in Table 2; it is only used to illustrate that when evaluating the soot blowing effect of the horizontal flue, for the partition screen heating surface, the final reheater, and the final superheater, at least three dimensions of data need to be considered: the change in heat absorption, the change in outlet steam temperature, and the change in outlet flue gas temperature. The specific values ​​of the heat change, the change in outlet steam temperature, and the change in outlet flue gas temperature can be measured from actual scenarios, and this embodiment does not impose any limitations.

[0107] Table 2 Evaluation Table of Soot Blowing Effect in Horizontal Flue

[0108] By standardizing and weighting the evaluation indicators, the characteristic quantities of the soot blowing effect for each heated surface can be obtained. (m=1-3), sort the above 3 heating surfaces according to the characteristic quantity. For example, the sorting result of the heating surfaces can be: final stage superheater C-partition superheater A-final stage reheater B.

[0109] (4) Obtain the comprehensive evaluation results of multiple pairs of soot blowers, and determine the soot blowing strategy based on the comprehensive evaluation results.

[0110] Combining the results obtained in steps (2) and (3) above, a comprehensive evaluation result of the soot blowing effect of multiple pairs of soot blowers can be formed. Taking the horizontal flue as an example, based on the sorting results of multiple pairs of soot blowers corresponding to the heating surface and the sorting results of the heating surface, Table 3 can be obtained.

[0111] Table 3 Ranking of Sootblowing Effects of Multiple Sootblowers in Horizontal Flues

[0112] Understandably, during the comprehensive evaluation, the comparison of the sootblowers ranked first on each heated surface is prioritized, resulting in a ranking of sootblower 6-3-4. Next, the second-ranked sootblower is considered, leading to a ranking of sootblower 9-1-2. Then, the third and fourth-ranked sootblowers are examined, and the previously existing sootblowers 2 and 6 are removed, resulting in a ranking of sootblower 8-5. Finally, only sootblower 7 remains. Therefore, the final comprehensive ranking of the sootblowers is: 6-3-4-9-1-2-8-5-7.

[0113] In actual production, the corresponding soot blowers can be started sequentially according to the order in this comprehensive sorting method to perform soot blowing operations.

[0114] In the above technical solution, the operating condition data of the coal-fired boiler unit is first acquired. This data includes the unit load and multiple parameter values ​​of the boiler's heating surface. Then, based on this operating condition data and set evaluation indicators, the sootblowing effect of multiple pairs of sootblowers within the coal-fired boiler unit is evaluated, resulting in a comprehensive evaluation result. Finally, the sootblowing strategy for the multiple pairs of sootblowers within the unit is determined based on this comprehensive evaluation result. This technical solution utilizes the operating condition data of the coal-fired boiler unit and set evaluation indicators to obtain the sootblowing effect of the coal-fired boiler sootblowers. Adjusting the sootblowing strategy based on this effect can then avoid over-blowing or under-blowing during the sootblowing process.

[0115] Figure 10 This is a block diagram illustrating a soot blowing strategy determination device for a coal-fired boiler soot blower according to an exemplary embodiment, such as... Figure 10 As shown, the device includes: an acquisition module 1010, an evaluation module 1020, and a determination module 1030; The acquisition module 1010 is used to acquire the operating condition data of the coal-fired boiler unit; the operating condition data includes the unit load and multiple parameter values ​​of the boiler's heating surface; The evaluation module 1020 is used to evaluate the soot blowing effect of multiple pairs of soot blowers in the coal-fired boiler unit based on the operating data and set evaluation indicators, and to obtain the comprehensive evaluation result of the multiple pairs of soot blowers. The determining module 1030 is used to determine the soot blowing strategy for multiple pairs of soot blowers in the unit based on the comprehensive evaluation results.

[0116] Optionally, the evaluation module 1020 is also used for: Based on the operating data and the set evaluation indicators, the single-blow soot blowing effect of the multiple pairs of soot blowers is evaluated, and the first evaluation result of the multiple pairs of soot blowers is obtained. Among them, the multiple parameter values ​​of the boiler's heating surface include one or more of the following: heating surface heat, heating surface inlet flue gas temperature, heating surface outlet flue gas temperature, heating surface inlet steam temperature, and heating surface outlet steam temperature. The set evaluation indicators include the change value of heating surface heat, the change value of heating surface outlet flue gas temperature, and the change value of heating surface outlet steam temperature. The soot blowing effect of multiple heating surfaces on different types of flues is evaluated to obtain a second evaluation result; wherein each of the multiple heating surfaces is equipped with at least one pair of soot blowers; The comprehensive evaluation result of the multiple pairs of soot blowers is obtained based on the first evaluation result and the second evaluation result.

[0117] Optionally, the evaluation module 1020 includes: a soot blowing submodule, an acquisition submodule, a first determination submodule, and an evaluation submodule; The soot blowing submodule is used to sequentially blow soot from each of the multiple pairs of soot blowers according to a first soot blowing method; the first soot blowing method is to sequentially start each pair of soot blowers according to a set time interval. The acquisition submodule is used to acquire multiple first parameter values ​​of the boiler's heating surface before the soot blowing action of each pair of soot blowers begins; the first parameter values ​​include: heat of the first heating surface, flue gas temperature at the outlet of the first heating surface, and steam temperature at the outlet of the first heating surface; The acquisition submodule is also used to acquire multiple second parameter values ​​of the boiler's heating surface after the soot blowing action of each pair of soot blowers stops; the second parameter values ​​include: heat of the second heating surface, flue gas temperature at the outlet of the second heating surface, and steam temperature at the outlet of the second heating surface; The first determining submodule is used to determine multiple first evaluation indicators corresponding to the multiple pairs of soot blowers based on the multiple first parameter values ​​and the multiple second parameter values. The first evaluation indicators include the heat change value of the first heating surface, the flue gas temperature change value of the first heating surface outlet, and the steam temperature change value of the first heating surface outlet. This evaluation submodule is used to obtain the first evaluation results of the multiple pairs of soot blowers based on the multiple first evaluation indicators.

[0118] Optionally, this evaluation submodule is also used for: By standardizing and weighting the heat change value of the first heating surface, the flue gas temperature change value of the first heating surface outlet, and the steam temperature change value of the first heating surface outlet in any of the first evaluation indicators, a pair of characteristic quantities for evaluating the effect of the sootblower corresponding to the first evaluation indicator are obtained. Based on the characteristic quantity of each pair of soot blowers in the multiple pairs of soot blowers, the soot blowing effect of the multiple pairs of soot blowers is ranked to obtain the first ranking result of the multiple pairs of soot blowers, and the first ranking result is used as the first evaluation result.

[0119] Optionally, this different type of flue includes horizontal flues and tail flues. The soot blowing submodule is also used to blow soot onto the multiple heated surfaces according to a second soot blowing method; the second soot blowing method is to blow soot sequentially according to the position distribution of the soot blowers on the heated surfaces. The acquisition submodule is also used to acquire multiple second evaluation indicators corresponding to the multiple heating surfaces. The second evaluation indicators include the heat change value of the second heating surface, the flue gas temperature change value at the outlet of the second heating surface, and the steam temperature change value at the outlet of the second heating surface. The evaluation submodule is also used to obtain the second evaluation results of the multiple heated surfaces based on the multiple second evaluation indicators.

[0120] Optionally, this evaluation submodule is also used for: By standardizing and weighting the heat change value of the second heating surface, the flue gas temperature change value of the second heating surface outlet, and the steam temperature change value of the second heating surface outlet in any of the second evaluation indicators, a characteristic quantity for evaluating the soot blowing effect of a heating surface corresponding to the second evaluation indicator is obtained. Based on the characteristic quantity of each of the multiple heated surfaces, the blowing effect of the multiple heated surfaces is sorted to obtain a second sorting result of the multiple heated surfaces, and the second sorting result is used as the second evaluation result.

[0121] Optionally, the evaluation module 1020 is also used for: Based on the first ranking result in the first evaluation result and the second ranking result in the second evaluation result, the comprehensive ranking method of the multiple pairs of soot blowers is obtained, and the comprehensive ranking method is used as the comprehensive evaluation result.

[0122] Optionally, the determining module 1030 includes: a second determining submodule and a sootblower starting submodule; The second determining submodule is used to determine the number of soot blowers that need to be started based on the load conditions of the coal-fired boiler unit; The sootblower start-up submodule is used to start the sootblowers according to the number of sootblowers that need to be started, and in the order of the comprehensive ranking method in the comprehensive evaluation results.

[0123] Optionally, the acquisition module 1010 is also used for: Obtain the original operating data of the coal-fired boiler unit; The original heating surface temperature data in the original operating condition data is filtered and denoised to obtain operating condition data containing optimized heating surface temperature data, which is used as the operating condition data of the coal-fired boiler unit; wherein, the heating surface temperature data includes one or more of the following: heating surface inlet flue gas temperature, heating surface outlet flue gas temperature, heating surface inlet steam temperature, and heating surface outlet steam temperature.

[0124] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0125] Figure 11 This is a block diagram illustrating an electronic device 1100 according to an exemplary embodiment. (See diagram below.) Figure 11 As shown, the electronic device 1100 may include: a processor 1101 and a memory 1102. The electronic device 1100 may also include one or more of a multimedia component 1103, an input / output (I / O) interface 1104, and a communication component 1105.

[0126] The processor 1101 controls the overall operation of the electronic device 1100 to complete all or part of the steps in the soot blowing strategy determination method for the coal-fired boiler soot blower described above. The memory 1102 stores various types of data to support the operation of the electronic device 1100. This data may include, for example, instructions for any application or method operating on the electronic device 1100, and application-related data such as contact data, sent and received messages, pictures, audio, video, etc. The memory 1102 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. Multimedia component 1103 may include a screen and an audio component. The screen may be, for example, a touchscreen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in memory 1102 or transmitted via communication component 1105. The audio component also includes at least one speaker for outputting audio signals. I / O interface 1104 provides an interface between processor 1101 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual or physical buttons. Communication component 1105 is used for wired or wireless communication between the electronic device 1100 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IoT, eMTC, or other 5G technologies, or combinations thereof, is not limited here. Therefore, the corresponding communication component 1105 may include: a Wi-Fi module, a Bluetooth module, an NFC module, etc.

[0127] In an exemplary embodiment, the electronic device 1100 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described method for determining the soot blowing strategy of a coal-fired boiler soot blower.

[0128] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the soot blowing strategy determination method for a coal-fired boiler as described above. For example, the computer-readable storage medium may be the memory 1102 including program instructions, which may be executed by the processor 1101 of the electronic device 1100 to complete the soot blowing strategy determination method for a coal-fired boiler as described above.

[0129] Figure 12 This is a block diagram illustrating an electronic device 1200 according to an exemplary embodiment. For example, the electronic device 1200 may be provided as a server. (Refer to...) Figure 12 The electronic device 1200 includes a processor 1222, which may be one or more, and a memory 1232 for storing computer programs executable by the processor 1222. The computer program stored in the memory 1232 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processor 1222 may be configured to execute the computer program to perform the aforementioned method for determining the soot blowing strategy of a coal-fired boiler soot blower.

[0130] Additionally, the electronic device 1200 may also include a power supply component 1226 and a communication component 1250. The power supply component 1226 can be configured to perform power management of the electronic device 1200, and the communication component 1250 can be configured to enable communication of the electronic device 1200, such as wired or wireless communication. Furthermore, the electronic device 1200 may also include an input / output (I / O) interface 1258. The electronic device 1200 can operate on an operating system stored in the memory 1232.

[0131] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the soot blowing strategy determination method for a coal-fired boiler as described above. For example, the non-transitory computer-readable storage medium may be the memory 1232 including program instructions, which may be executed by the processor 1222 of the electronic device 1200 to complete the soot blowing strategy determination method for a coal-fired boiler as described above.

[0132] In another exemplary embodiment, a computer program product is also provided, the computer program product comprising a computer program executable by a programmable device, the computer program having a code portion for performing the above-described method for determining the soot blowing strategy of a coal-fired boiler soot blower when executed by the programmable device.

[0133] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0134] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0135] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A method for determining the soot blowing strategy of a soot blower in a coal-fired boiler, characterized in that, The method includes: Obtain operating condition data of the coal-fired boiler unit; the operating condition data includes unit load and multiple parameter values ​​of the boiler's heating surface; Based on the operating data and the set evaluation indicators, the soot blowing effect of multiple pairs of soot blowers in the coal-fired boiler unit is evaluated, and the comprehensive evaluation result of the multiple pairs of soot blowers is obtained. The soot blowing strategy for multiple pairs of soot blowers within the unit is determined based on the comprehensive evaluation results. The evaluation of the sootblowing effect of multiple pairs of sootblowers in the coal-fired boiler unit based on the operating data and set evaluation indicators, to obtain a comprehensive evaluation result of the multiple pairs of sootblowers, includes: Based on the operating data and set evaluation indicators, the single-blow soot blowing effect of the multiple pairs of soot blowers is evaluated to obtain the first evaluation result of the multiple pairs of soot blowers; wherein, the multiple parameter values ​​of the boiler's heating surface include one or more of the following: heating surface heat, heating surface inlet flue gas temperature, heating surface outlet flue gas temperature, heating surface inlet steam temperature, and heating surface outlet steam temperature; the set evaluation indicators include the heating surface heat change value, the heating surface outlet flue gas temperature change value, and the heating surface outlet steam temperature change value. The soot blowing effect of multiple heating surfaces on different types of flues is evaluated to obtain a second evaluation result; wherein each of the multiple heating surfaces is provided with at least one pair of soot blowers; The comprehensive evaluation result of the multiple pairs of soot blowers is obtained based on the first evaluation result and the second evaluation result.

2. The method according to claim 1, characterized in that, The evaluation of the single-blow sootblowing effect of the multiple pairs of sootblowers based on the operating condition data and set evaluation indicators, to obtain the first evaluation result of the multiple pairs of sootblowers, includes: Soot blowing is performed sequentially on each pair of soot blowers according to a first soot blowing method; the first soot blowing method is to start each pair of soot blowers sequentially according to a set time interval. Obtain multiple first parameter values ​​of the boiler's heating surface before the soot blowing action of each pair of soot blowers begins; the first parameter values ​​include: heat of the first heating surface, flue gas temperature at the outlet of the first heating surface, and steam temperature at the outlet of the first heating surface; Acquire multiple second parameter values ​​of the boiler's heating surface after the soot blowing action of each pair of soot blowers stops; the second parameter values ​​include: heat of the second heating surface, flue gas temperature at the outlet of the second heating surface, and steam temperature at the outlet of the second heating surface; Based on the plurality of first parameter values ​​and the plurality of second parameter values, a plurality of first evaluation indicators corresponding to the plurality of pairs of soot blowers are determined respectively. The first evaluation indicators include the heat change value of the first heating surface, the flue gas temperature change value of the first heating surface outlet, and the steam temperature change value of the first heating surface outlet. The first evaluation results of the multiple pairs of soot blowers are obtained based on the multiple first evaluation indicators.

3. The method according to claim 2, characterized in that, The process of obtaining the first evaluation results for the multiple pairs of soot blowers based on the multiple first evaluation indicators includes: By standardizing and weighting the change values ​​of heat from the first heating surface, the change values ​​of flue gas temperature at the outlet of the first heating surface, and the change values ​​of steam temperature at the outlet of the first heating surface in any of the first evaluation indicators, a pair of feature quantities for evaluating the effect of the sootblower corresponding to the first evaluation indicator are obtained. The blowing effect of the multiple pairs of soot blowers is ranked according to the characteristic quantity of each pair of soot blowers to obtain a first ranking result of the multiple pairs of soot blowers, and the first ranking result is used as the first evaluation result.

4. The method according to claim 1, characterized in that, The different types of flue zones include horizontal flues and tail flues. The soot blowing effect on multiple heated surfaces on each of the different types of flues is evaluated to obtain a second evaluation result, including: The plurality of heated surfaces are blown with soot according to a second soot blowing method; the second soot blowing method is to blow soot sequentially according to the positional distribution of the soot blowers on the heated surfaces. Obtain multiple second evaluation indicators corresponding to the multiple heating surfaces, the second evaluation indicators including the heat change value of the second heating surface, the flue gas temperature change value at the outlet of the second heating surface, and the steam temperature change value at the outlet of the second heating surface; The second evaluation results of the multiple heated surfaces are obtained based on the multiple second evaluation indicators.

5. The method according to claim 4, characterized in that, The process of obtaining the second evaluation results of the multiple heated surfaces based on the multiple second evaluation indicators includes: By standardizing and weighting the heat change value of the second heating surface, the flue gas temperature change value of the second heating surface outlet, and the steam temperature change value of the second heating surface outlet in any of the second evaluation indicators, a characteristic quantity for evaluating the soot blowing effect of a heating surface corresponding to the second evaluation indicator is obtained. The multiple heated surfaces are sorted by their soot blowing effect according to the characteristic quantity of each heated surface, and a second sorting result is obtained. The second sorting result is used as the second evaluation result.

6. The method according to claim 1, characterized in that, The process of obtaining a comprehensive evaluation result for the multiple pairs of soot blowers based on the first evaluation result and the second evaluation result includes: Based on the first ranking result in the first evaluation result and the second ranking result in the second evaluation result, a comprehensive ranking method for the multiple pairs of soot blowers is obtained, and the comprehensive ranking method is used as the comprehensive evaluation result.

7. The method according to claim 6, characterized in that, The step of determining the soot blowing strategy for multiple pairs of soot blowers within the unit based on the comprehensive evaluation results includes: The number of soot blowers that need to be started is determined based on the load conditions of the coal-fired boiler unit; Based on the number of soot blowers that need to be activated, the soot blowers are activated in the order of the comprehensive ranking method in the comprehensive evaluation results.

8. The method according to any one of claims 1-7, characterized in that, The acquisition of operating condition data of the coal-fired boiler unit includes: Obtain the original operating condition data of the coal-fired boiler unit; The original heating surface temperature data in the original operating condition data is filtered and denoised to obtain operating condition data containing optimized heating surface temperature data, which is used as the operating condition data of the coal-fired boiler unit; wherein, the heating surface temperature data includes one or more of the following: heating surface inlet flue gas temperature, heating surface outlet flue gas temperature, heating surface inlet steam temperature, and heating surface outlet steam temperature.

9. A device for determining the soot blowing strategy of a coal-fired boiler soot blower, characterized in that, The device includes: The acquisition module is used to acquire the operating condition data of the coal-fired boiler unit; the operating condition data includes the unit load and multiple parameter values ​​of the boiler's heating surface; The evaluation module is used to evaluate the soot blowing effect of multiple pairs of soot blowers in the coal-fired boiler unit based on the operating data and set evaluation indicators, and to obtain a comprehensive evaluation result of the multiple pairs of soot blowers. The determination module is used to determine the soot blowing strategy for multiple pairs of soot blowers in the unit based on the comprehensive evaluation results; The evaluation module is also used for: Based on the operating data and set evaluation indicators, the single-blow soot blowing effect of the multiple pairs of soot blowers is evaluated to obtain the first evaluation result of the multiple pairs of soot blowers; wherein, the multiple parameter values ​​of the boiler's heating surface include one or more of the following: heating surface heat, heating surface inlet flue gas temperature, heating surface outlet flue gas temperature, heating surface inlet steam temperature, and heating surface outlet steam temperature; the set evaluation indicators include the heating surface heat change value, the heating surface outlet flue gas temperature change value, and the heating surface outlet steam temperature change value. The soot blowing effect of multiple heating surfaces on different types of flues is evaluated to obtain a second evaluation result; wherein each of the multiple heating surfaces is provided with at least one pair of soot blowers; The comprehensive evaluation result of the multiple pairs of soot blowers is obtained based on the first evaluation result and the second evaluation result.

10. An electronic device, characterized in that, include: A memory on which computer programs are stored; A processor for executing the computer program in the memory to implement the steps of the method according to any one of claims 1-8.

Images