Detection method and detection device for flue gas thermal state flow field in hearth of double tangent circle boiler

Abstract

The invention discloses a detection method and a detection device for a flue gas thermal state flow field in a hearth of a bisecting circle boiler. The detection method comprises the following steps: S1, acquiring static pressure values of all monitoring points; s2, calculating a first average value, a second average value, a third average value, a fourth average value, a fifth average value and a sixth average value based on the static pressure values of all the monitoring points; s3, based on the first average value, the second average value and the third average value, the variance of the static pressure values of the whole hearth is calculated, and when the variance of the static pressure values of the whole hearth is larger than a first preset variance, it is determined that the smoke flow field deviates from the design expectation; based on the fourth average value, the fifth average value and the sixth average value, the variance of the static pressure value of each monitoring area of the whole hearth is calculated, and when the variance of the static pressure value of each monitoring area of the whole hearth is larger than a second preset variance, it is determined that the flue gas flow field deviates from the designed expected section. According to the detection method provided by the invention, online detection of the flue gas flow field can be realized during operation of the boiler.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas flow field in a boiler furnace, and in particular to a method and a device for detecting the hot flow field of flue gas in a double tangential circle boiler furnace. Background Art

[0002] As the country's requirements for power system economics and environmental protection continue to increase, the development of high-parameter, large-capacity power plant boilers is imperative. Currently, large-capacity power plant boilers often use a double-tangential circle combustion arrangement. By increasing the number of burners, the thermal power of each burner is reduced, resulting in uniform heat load distribution, a short pulverized coal range, and excellent anti-slagging performance.

[0003] However, the double-tangential combustion method increases the furnace width, forming two flame centers on the left and right during the combustion process. The relative positions of the two flame centers can easily deviate significantly from the design expectations due to mutual crowding, leading to flue gas velocity deviations (i.e., flue gas volume deviations) at the furnace outlet. This in turn causes high-speed flue gas carrying pulverized coal and fly ash to directly scour the boiler water-wall heating surfaces, burners, furnace sootblowers, and other equipment, causing equipment wear and failure. Excessive deviations in the flue gas flow fields on either side of the boiler can also lead to long-term overheating of the boiler water-wall heating surfaces and the platen superheater heating surfaces, burnout, and extensive coking in the furnace, among other operational safety issues. Furthermore, this can cause deviations in the main steam and reheat steam temperatures on the left and right sides, which can, in severe cases, lead to overheating and tube bursts in the superheater and reheater. Therefore, preventing the high-temperature flue gas distribution parameters within the furnace from significantly deviating from the design expectations has always been a key task in power plant boiler operation.

[0004] Currently, the primary method for testing the flow distribution of high-temperature flue gas in power plant boilers is cold-state aerodynamic testing. This test involves starting the blower in a cold furnace state to observe and measure the aerodynamic conditions around the burner and furnace. Common observation methods include the ribbon method, the paper scrap method, the spark method, and measurement. These methods are primarily used for qualitative analysis and observation of in-furnace air flow conditions, such as flame center deviation, wall scouring, actual tangential circle size, burner installation angle, and its impact on the jet flow.

[0005] However, the existing methods of on-site cold aerodynamic characteristics test of boilers have the following problems: (1) The results of on-site cold aerodynamic characteristics test of boilers are significantly different from the actual results when the boilers are in hot operation, and are difficult to correct systematically; (2) Due to constraints in manpower, material resources, financial resources, time, etc., it is impossible to simulate the distribution of high-temperature flue gas flow field in the power plant boiler furnace under all common operating conditions during hot operation of the boiler; (3) The cold aerodynamic characteristics test conditions of boilers basically ignore the influencing factors other than the ideal operation of the equipment, such as damper jamming, burner nozzle ash blockage, uneven coal powder distribution, furnace bottom air leakage, coal type change, mill output change, etc., making it impossible to accurately detect whether the hot flow field of high-temperature flue gas (flame) burning in the furnace deviates from the design expectation.

[0006] In general, the existing combustion high-temperature flue gas flow field distribution test method cannot evaluate the degree of deviation of the hot flow field in the boiler furnace. Summary of the Invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for detecting the hot flow field of flue gas in the furnace of a double tangential circle boiler, which can realize online detection of the flue gas flow field during boiler operation.

[0008] The present invention also provides a device for detecting the hot flow field of flue gas in the furnace of a double-tangential-circle boiler.

[0009] The present invention also provides a double-tangential circle boiler having the above-mentioned detection device.

[0010] According to the first aspect of the present invention, a method for detecting the hot flow field of flue gas in a double-tangential circle boiler furnace, the furnace includes a first inner wall and a second inner wall arranged relative to each other in the left-right direction, the inner wall of the furnace includes a plurality of monitoring areas arranged in the up-down direction, each monitoring area includes: a first monitoring area and a second monitoring area, a plurality of the first monitoring areas are located on the first inner wall, a plurality of the second monitoring areas are located on the second inner wall, the first monitoring area and the second monitoring area are both provided with a plurality of monitoring points arranged in a matrix, the method includes: step S1, obtaining the static pressure values ​​of all monitoring points; step S2, based on the static pressure values ​​of all monitoring points, calculating a first average value, a second average value, a third average value, a fourth average value, a fifth average value and a sixth average value, wherein the first average value is the arithmetic average of the static pressure values ​​of all monitoring points, the second average value and the third average value are respectively the arithmetic average of the static pressure values ​​of all monitoring points, and the fourth average value and the fifth average value are respectively the arithmetic average of the static pressure values ​​of all monitoring points, and the fifth average value and the sixth ... The average values ​​are the arithmetic average values ​​of the static pressure values ​​of multiple monitoring points of the first inner wall and the multiple monitoring points of the second inner wall, the fourth average value is the arithmetic average value of the static pressure values ​​of multiple monitoring points in each monitoring area, the fifth average value is the arithmetic average value of the static pressure values ​​of multiple monitoring points in each first monitoring area, and the sixth average value is the arithmetic average value of the static pressure values ​​of multiple monitoring points in each second monitoring area; step S3, based on the first average value, the second average value and the third average value, calculate the variance of the static pressure value of the entire furnace, when the variance of the static pressure value of the entire furnace is greater than the first preset variance, determine that the flue gas flow field deviates from the design expectation; based on the fourth average value, the fifth average value and the sixth average value, calculate the variance of the static pressure value of each monitoring area of ​​the entire furnace, when the variance of the static pressure value of each monitoring area of ​​the entire furnace is greater than the second preset variance, determine that the flue gas flow field deviates from the design expected section.

[0011] According to the detection method of the hot flow field of flue gas in the furnace of a double-tangential circle boiler of the present invention, the flue gas flow field can be directly monitored during operation, and thus the performance of the boiler under actual working conditions can be reflected, including various factors that may affect the combustion efficiency, such as poor operation of the air damper, blockage of the burner nozzle, uneven distribution of coal powder, air leakage at the bottom of the furnace, changes in coal type, changes in the output of the pulverizer, etc., so that the test results can be made more real and comprehensive, which is helpful to discover and solve actual problems in the operation of the boiler; at the same time, it can also overcome the disadvantage that the test results of the cold-state aerodynamic characteristics of the boiler are significantly different from the actual results when the boiler is in hot operation and are difficult to compare and analyze, and thus the actual working state of the boiler can be more accurately reflected, avoiding the difference between the cold-state test results and the hot-state actual operation results; in addition, compared with the prior art, the test process of the above embodiment is relatively simple, thereby facilitating the examination of the distribution of the high-temperature flue gas flow field of the boiler furnace under all commonly used operating conditions in the hot operation of the boiler.

[0012] According to some embodiments of the present invention, step S3 includes: Using formula (1), calculate the variance of the static pressure value of the entire furnace: , (1) in, is the first average value; is the second average value; is the third average value; Using formula (2), calculate the variance of the static pressure value of each monitoring area in the entire furnace: , (2) in, is the fourth average value of the jth monitoring area; is the fifth average value of the jth first monitoring area; is the sixth average value of the j-th second monitoring area.

[0013] According to some embodiments of the present invention, the plurality of monitoring points on the first inner wall and the plurality of monitoring points on the second inner wall are symmetrically arranged about a center line in the left-right direction of the boiler furnace.

[0014] According to the second aspect of the present invention, a device for detecting the hot flow field of flue gas in a double-tangential circle boiler furnace, the furnace includes a first inner wall and a second inner wall arranged relative to each other in the left-right direction, the furnace includes a plurality of monitoring areas arranged in the up-down direction, the plurality of monitoring areas include: a plurality of first monitoring areas and a plurality of second monitoring areas, a plurality of the first monitoring areas are arranged on the first inner wall, a plurality of the second monitoring areas are arranged on the second inner wall, each of the monitoring areas is provided with a plurality of monitoring points arranged in a matrix, the detection device includes: a plurality of detection modules, the plurality of detection modules correspond one-to-one to the plurality of the monitoring points, and are used to detect the static pressure values ​​of the corresponding monitoring points; a data acquisition module, used to obtain the static pressure values ​​of the plurality of monitoring points on each inner wall; a calculation module, used to calculate a first average value, a second average value, a third average value, a fourth average value, a fifth average value and a sixth average value, and Calculate the variance of the static pressure values ​​of the entire furnace and the variance of the static pressure values ​​of each monitoring area of ​​the entire furnace, wherein the first average value is the arithmetic average of the static pressure values ​​of all monitoring points, the second average value and the third average value are the arithmetic average of the static pressure values ​​of multiple monitoring points on the first inner wall and the multiple monitoring points on the second inner wall, respectively, the fourth average value is the arithmetic average of the static pressure values ​​of multiple monitoring points in each monitoring area, the fifth average value is the arithmetic average of the static pressure values ​​of multiple monitoring points in each first monitoring area, and the sixth average value is the arithmetic average of the static pressure values ​​of multiple monitoring points in each second monitoring area; a deviation judgment module is used to determine that the flue gas flow field deviates from the design expectation when the variance of the static pressure values ​​of the entire furnace is greater than a first preset variance, and / or to determine that the flue gas flow field deviates from the design expected section when the variance of the static pressure values ​​of each monitoring area of ​​the entire furnace is greater than a second preset variance.

[0015] The detection device according to the present invention can realize real-time monitoring and analysis of the thermal flow field of flue gas in the furnace of a double-tangential-circle boiler, thereby making the test results more realistic and comprehensive, and facilitating the timely discovery and resolution of practical problems in boiler operation. According to some embodiments of the present invention, the furnace includes: fins, each having a through hole formed thereon that passes through the fin along the thickness direction of the fin, the through hole being connected to the internal space of the furnace, and the detection module is adapted to be fixed to the side of the fin facing away from the boiler furnace, and is used to detect the static pressure of the flue gas at the location of the through hole.

[0016] According to some embodiments of the present invention, the detection module includes: a metal tube, an air duct is formed inside the metal tube, the air duct is suitable for being connected to the through hole, and a first interface connected to the air duct is formed on the metal tube; a pressure sensor, the pressure sensor is fixedly connected to the metal tube through the first interface, and the pressure sensor is used to detect the static pressure of the flue gas in the boiler furnace.

[0017] According to some embodiments of the present invention, the metal tube includes: a main tube, the first end of the main tube is configured to be suitable for being fixed to the fin, a first channel is formed in the main tube, and the first channel is suitable for being connected to the through hole; a branch tube, the branch tube is arranged at an angle to the main tube, and the first end of the branch tube is connected to the main tube, a second channel is formed in the branch tube and is connected to the first channel, and the first interface is formed on the branch tube; and a blocking piece, the blocking piece is used to block the second end of the main tube and the second end of the branch tube.

[0018] According to some embodiments of the present invention, the blocking member is detachably connected to the main pipe and / or the branch pipe.

[0019] According to the third aspect of the present invention, a double-tangential circle boiler includes: a furnace, the furnace includes a first inner wall and a second inner wall arranged relative to each other in the left-right direction, the inner wall of the furnace includes a plurality of monitoring areas arranged in the up-down direction, each monitoring area includes: a first monitoring area and a second monitoring area, a plurality of the first monitoring areas are located on the first inner wall, a plurality of the second monitoring areas are located on the second inner wall, and the first monitoring areas and the second monitoring areas are both provided with a plurality of monitoring points arranged in a matrix; and a detection device according to the second aspect of the present invention.

[0020] According to the double tangential circle boiler of the present invention, the overall performance of the double tangential circle boiler is improved by providing the detection device of the second embodiment.

[0021] According to some embodiments of the present invention, the furnace further includes: fins, each of which is provided with a through hole extending through the fin in the thickness direction of the fin; the detection module further includes a metal tube, an air duct is formed inside the metal tube, the air duct is suitable for being connected to the through hole; a second interface connected to the air duct is formed on the metal tube; the double-cut circle boiler further includes: an injection assembly, the injection assembly is suitable for providing gas to the air duct through the second interface.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of a double tangential circle boiler according to an embodiment of the present invention; Figure 2 is a schematic diagram of a furnace according to an embodiment of the present invention; Figure 3 is a partial schematic diagram of a furnace according to an embodiment of the present invention; Figure 4 is a partial schematic diagram of a furnace from another angle according to an embodiment of the present invention; Figure 5 is a schematic diagram of a detection device according to an embodiment of the present invention; Figure 6 is a schematic diagram of a detection module according to an embodiment of the present invention; Figure 7 is a flow chart of a detection method according to an embodiment of the present invention.

[0024] Reference numerals: 100. Double tangential circle boiler; 10. Furnace; 11. First inner wall; 12. Second inner wall; 13. Monitoring area; 131. First monitoring area; 132. Second monitoring area; 133. Monitoring point; 14. Fin; 141. Through hole; 15. Water-cooling pipe; 20. Detection device; 21. Detection module; 211. Metal pipe; 2111. Main pipe; 2112. Branch pipe; 2113. First interface; 2114. Second interface; 2115. Blocking member; 2116. Airway; 22. Data acquisition module; 23. Calculation module; 24. Deviation determination module; 30. Burner. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0026] Reference below Figure 1-Figure 7 A method for detecting the hot flow field of flue gas in the furnace 10 of a double tangential circle boiler 100 according to an embodiment of the first aspect of the present invention is described.

[0027] like Figure 2 As shown, a method for detecting the hot flow field of flue gas in the furnace 10 of a double-tangential boiler 100 according to an embodiment of the first aspect of the present invention is shown, wherein the furnace 10 includes a first inner wall 11 and a second inner wall 12 arranged relatively along the left-right direction, and the inner wall of the furnace 10 includes a plurality of monitoring areas 13 arranged along the up-down direction, each monitoring area 13 includes: a first monitoring area 131 and a second monitoring area 132, multiple first monitoring areas 131 are located on the first inner wall 11, and multiple second monitoring areas 132 are located on the second inner wall 12, and the first monitoring area 131 and the second monitoring area 132 are both provided with a plurality of monitoring points 133 arranged in a matrix.

[0028] It should be noted that the burners 30 of a double-tangential-circle-fired power plant boiler are typically located on the front and rear walls of the furnace 10. Due to the high air velocity at the burner 30 outlet, the velocity gradient is large, and the resulting disturbance to the flue gas flow is significant. Therefore, the static pressure values ​​at these burner 30 outlets are not suitable for analysis. The static pressure distribution characteristics of the two side walls of the furnace 10 better reflect the degree to which the relative positions of the two flue gas flow tangential circles (flame centers) within the furnace deviate from the design expectations. Therefore, the flue gas static pressure data from the left and right side walls of the boiler are used as the basis for comparative analysis, and monitoring points 133 are then placed on the first and second inner walls 11, 12, spaced apart on the left and right sides.

[0029] It should be further explained that each monitoring area 13 refers to a cross-section of a layer of the first inner wall 11 and the second inner wall 12 of the furnace 10, that is, a cross-section of the boiler furnace 10. The first monitoring area 131 refers to a cross-section of a layer of the first inner wall 11 of the furnace 10, and the second monitoring area 132 refers to a cross-section of a layer of the second inner wall 12 of the furnace 10.

[0030] Because the boiler burners 30 are located on the front and rear walls of the furnace 10, during normal operation, the static pressure distribution characteristics of the flue gas near the centerline of the inner wall of the furnace 10 will differ from those near the corners. Therefore, providing multiple monitoring areas 13 and multiple monitoring points 133 can further improve monitoring accuracy.

[0031] Reference Figure 7 , detection methods include: Step S1, obtain the static pressure value of all monitoring points 133; refer to Figure 5 The detection module 21 detects the static pressure value at the corresponding monitoring point 133; the data acquisition module 22 then acquires the static pressure values ​​at multiple monitoring points 133 on each inner wall. It should be noted that because the boiler burners 30 are located on the front and rear walls of the furnace 10, during normal operation, the static pressure distribution characteristics of the flue gas near the centerline of the inner wall of the furnace 10 will differ from those near the corners. Therefore, it is necessary to acquire the static pressure values ​​at all monitoring points 133.

[0032] Step S2, based on the static pressure values ​​of all monitoring points 133, calculate the first average value, the second average value, the third average value, the fourth average value, the fifth average value and the sixth average value, wherein the first average value is the arithmetic average of the static pressure values ​​of all monitoring points 133, the second average value and the third average value are the arithmetic average of the static pressure values ​​of multiple monitoring points 133 of the first inner wall 11 and the multiple monitoring points 133 of the second inner wall 12, respectively, the fourth average value is the arithmetic average of the static pressure values ​​of multiple monitoring points 133 of each monitoring area 13, the fifth average value is the arithmetic average of the static pressure values ​​of multiple monitoring points 133 of each first monitoring area 131, and the sixth average value is the arithmetic average of the static pressure values ​​of multiple monitoring points 133 of each second monitoring area 132.

[0033] It is understandable that the above-mentioned arithmetic means can be calculated by the calculation module 23. It should be noted that the arithmetic mean in the above-mentioned embodiment can be a weighted arithmetic mean or a simple arithmetic mean.

[0034] It should be further explained that when the number of columns of monitoring points 133 arranged on the first inner wall 11 and the second inner wall 12 is small, for example, only three columns are included as shown in the figure, then the arithmetic mean of the above embodiment is a weighted arithmetic mean, and the weights of the flue gas static pressure measurement values ​​of each column in the non-central area of ​​the first inner wall 11 and the second inner wall 12 need to be reduced during the calculation, where 0<weight value F<1.

[0035] Specifically, the first average , the second average , the third average ,in, is the static pressure value of the monitoring point 133 in the j-th layer and k-th column of the first inner wall 11, is the weight value of the monitoring point 133 in the j-th layer and the k-th column of the first inner wall 11, is the static pressure value of the monitoring point 133 in the j-th layer and k-th column of the second inner wall 12, is the weight value of the monitoring point 133 in the j-th layer and the k-th column of the second inner wall 12 .

[0036] Fourth average , the fifth average , the sixth average ,in, is the static pressure value of the monitoring point 133 in the j-th layer and k-th column of the first inner wall 11, is the weight value of the monitoring point 133 in the j-th layer and the k-th column of the first inner wall 11, is the static pressure value of the monitoring point 133 in the j-th layer and k-th column of the second inner wall 12, is the weight value of the monitoring point 133 in the j-th layer and the k-th column of the second inner wall 12 .

[0037] When the number of columns of monitoring points 133 arranged in the first inner wall 11 and the second inner wall is large, for example greater than or equal to five columns, then the number of flue gas static pressure measurement points in each column of the non-central area of ​​the left and right side walls accounts for a small proportion. Therefore, the arithmetic mean in the above embodiment can be a simple arithmetic mean.

[0038] Specifically, the first average , the second average , the third average ,in, is the static pressure value of the monitoring point 133 in the jth layer and kth column of the i-th inner wall, is the weight value of the monitoring point 133 in the jth layer and kth column of the i-th inner wall, is the static pressure value of the monitoring point 133 in the j-th layer and k-th column of the first inner wall 11, is the weight value of the monitoring point 133 in the j-th layer and the k-th column of the first inner wall 11, is the static pressure value of the monitoring point 133 in the j-th layer and k-th column of the second inner wall 12, is the weight value of the monitoring point 133 in the j-th layer and the k-th column of the second inner wall 12 , n is the number of monitoring areas 13 , and K is the number of monitoring points 133 in each monitoring area 13 .

[0039] Fourth average , the fifth average , the sixth average ,in, is the static pressure value of the monitoring point 133 in the j-th layer and k-th column of the first inner wall 11, is the weight value of the monitoring point 133 in the j-th layer and the k-th column of the first inner wall 11, is the static pressure value of the monitoring point 133 in the j-th layer and k-th column of the second inner wall 12, is the weight value of the monitoring point 133 in the j-th layer and the k-th column of the second inner wall 12 , and K is the number of monitoring points 133 in each monitoring area 13 .

[0040] In addition, since the relative importance of different data points in the population is taken into account in the process of calculating the weighted arithmetic mean, by calculating the arithmetic mean of the static pressure values ​​of all monitoring points 133, the overall distribution of the static pressure of the entire boiler furnace 10 can be reflected, and by calculating the arithmetic mean of the static pressure values ​​of each monitoring area 13, the distribution of the static pressure of each layer of the boiler furnace 10 can be reflected.

[0041] Step S3, based on the first average value, the second average value and the third average value, calculate the variance of the static pressure value of the entire furnace 10, when the variance of the static pressure value of the entire furnace 10 is greater than the first preset variance, determine that the flue gas flow field deviates from the design expectation; based on the fourth average value, the fifth average value and the sixth average value, calculate the variance of the static pressure value of each monitoring area 13 of the entire furnace 10, when the variance of the static pressure value of each monitoring area 13 of the entire furnace 10 is greater than the second preset variance, determine that the flue gas flow field deviates from the design expected section.

[0042] It can be understood that the calculation module 23 calculates the variance of the static pressure value of the entire furnace 10 and the variance of the static pressure value of each monitoring area 13 of the entire furnace 10, and then the deviation judgment module 24 determines whether the flue gas flow field deviates from the design expectation and whether it deviates from the design expected cross-section.

[0043] Specifically, probability theory shows that the variance characterizes the degree of dispersion of a random variable relative to its mathematical expectation. The larger the variance, the wider the distribution of the random variable's values ​​around the mathematical expectation. Specifically, in the above embodiment, the arithmetic mean of the test values ​​of all flue gas static pressure points on both side walls of the furnace 10 is the mathematical expectation, and the arithmetic mean of the test values ​​of the flue gas static pressure points on each side wall of the boiler, i.e., the first inner wall 11 or the second inner wall 12, is the random variable. Therefore, the variance of the static pressure values ​​of the entire furnace 10 can be calculated using the first, second, and third average values.

[0044] Specifically, according to some embodiments of the present invention, step S3 includes: using formula (1), calculating the variance of the static pressure value of the entire furnace 10 , (1), where is the first average value; is the second average value; The third average value.

[0045] It should be noted that after confirming that the flue gas flow field deviates from the design expectations through the static pressure values ​​of the entire furnace 10, in order to further understand the degree to which the relative positions of the two flow tangent circles (flame centers) within the furnace 10 deviate from the design starting position, it is necessary to analyze the degree to which the relative positions of the two flue gas tangent circles deviate from the design expectations for each test cross-section of the boiler furnace 10. In this case, when calculating the variance, the mathematical expectation is the arithmetic mean of all the flue gas static pressure test values ​​for the walls on both sides of the same cross-section of the furnace 10. The random variable is the arithmetic mean of the flue gas static pressure test values ​​for each side wall of the same cross-section of the furnace 10, that is, the first inner wall 11 or the second inner wall 12.

[0046] Specifically, according to some embodiments of the present invention, step S3 further includes: using formula (2), calculating the variance of the static pressure value of each monitoring area 13 of the entire furnace 10 , (2), where is the fourth average value of the j-th monitoring area 13; is the fifth average value of the j-th first monitoring area 131; is the sixth average value of the j-th second monitoring area 132.

[0047] It should be noted that the first preset variance is the variance analysis benchmark value for the static pressure test values ​​of the entire furnace 10, and the second preset variance is the variance analysis benchmark value for the static pressure test values ​​of the same cross-section of the entire furnace 10. It should be further explained that the variance analysis benchmark value can be determined in two ways: first, by referring to previous test results of similar boilers; second, by performing computer numerical simulations based on the boiler design structure to make reasonable adjustments to the operating parameter imbalance. While ensuring boiler operational safety, environmental protection, and economic efficiency, acceptable two-circle offset (imbalance) operating conditions can be determined, and the overall static pressure distribution of the furnace 10 wall can be determined through numerical calculations. Static pressure data from the simulation results is then extracted according to the actual measurement points throughout the entire furnace 10, and the variance analysis benchmark value is calculated based on this static pressure data.

[0048] It can be understood that the detection method of this embodiment is to obtain the static pressure value of the flue gas at each monitoring point 133 during the actual operation of the boiler, and based on the static pressure value of each monitoring point 133, combine aerodynamic theory and probability theory to analyze the relative position offset problem and the degree of offset of the tangential circles on both sides of the double-tangential-circle combustion boiler.

[0049] In the existing technology, the main method for testing the air flow field distribution of high-temperature flue gas burning in the furnace of a power station boiler is the boiler cold-state aerodynamic characteristics test. The test results of this test are significantly different from the actual results when the boiler is running hot, and are difficult to correct systematically. In addition, this test is generally conducted with reference to the typical operating conditions of the boiler, and it is unable to simulate the air flow field distribution of high-temperature flue gas burning in the furnace of a power station boiler under all common operating conditions during the hot operation of the boiler. In addition, when conducting the boiler cold-state aerodynamic characteristics test, it is necessary to conduct it during the boiler shutdown period, which results in the neglect of influencing factors other than the ideal operation of the equipment during the test process.

[0050] This embodiment, however, obtains the static pressure value of the flue gas generated during boiler operation and analyzes the variance of the static pressure value to analyze the relative position offset of the two tangential circles of the double tangential combustion boiler and the degree of offset. Thus, compared to the prior art, the above embodiment can directly monitor the flue gas flow field during operation, thereby reflecting the performance of the boiler under actual operating conditions, including various factors that may affect combustion efficiency, such as poor damper operation, burner 30 nozzle blockage, uneven coal distribution, furnace bottom air leakage, coal type changes, mill output changes, etc., thereby making the test results more realistic and comprehensive, helping to discover and solve actual problems in boiler operation. At the same time, it can also overcome the disadvantage that the cold-state aerodynamic characteristics test results of the boiler differ significantly from the actual results of the boiler during hot operation and are difficult to compare and analyze, thereby more accurately reflecting the actual operating state of the boiler and avoiding the discrepancy between the cold-state test results and the actual hot-state operation results. In addition, compared to the prior art, the testing process of the above embodiment is relatively simple, thereby facilitating the examination of the high-temperature flue gas flow field distribution in the boiler furnace under all common operating conditions during hot operation.

[0051] According to the method for detecting the hot flow field of flue gas in the furnace 10 of the double-tangential circle boiler 100 according to the embodiment of the present invention, the flue gas flow field can be directly monitored during operation, thereby reflecting the performance of the boiler under actual working conditions, including various factors that may affect the combustion efficiency, such as poor operation of the air damper, blockage of the burner 30 nozzle, uneven distribution of coal powder, air leakage at the bottom of the furnace, changes in coal type, changes in mill output, etc., so that the test results can be made more real and comprehensive, which helps to discover and solve actual problems in boiler operation; at the same time, it can also overcome the disadvantage that the test results of the cold-state aerodynamic characteristics of the boiler are significantly different from the actual results when the boiler is in hot operation and are difficult to compare and analyze, thereby more accurately reflecting the actual working state of the boiler and avoiding the difference between the cold-state test results and the hot-state actual operation results; in addition, compared with the prior art, the testing process of the above embodiment is relatively simple, thereby facilitating the examination of the distribution of the high-temperature flue gas flow field of the boiler furnace under all commonly used operating conditions in the hot operation of the boiler.

[0052] According to some embodiments of the present invention, referring to Figure 2 The plurality of monitoring points 133 on the first inner wall 11 and the plurality of monitoring points 133 on the second inner wall 12 are symmetrically arranged about the left-right center line of the boiler furnace 10. This can help improve the accuracy of the test results.

[0053] According to the second aspect of the present invention, the detection device 20 of the flue gas hot state flow field in the furnace 10 of the double tangential circle boiler 100 is as follows: Figure 2 and Figure 5 The furnace 10 includes a first inner wall 11 and a second inner wall 12 arranged relatively to each other in the left-right direction. The furnace 10 includes a plurality of monitoring areas 13 arranged in the up-down direction. The plurality of monitoring areas 13 include: a plurality of first monitoring areas 131 and a plurality of second monitoring areas 132. The plurality of first monitoring areas 131 are arranged on the first inner wall 11, and the plurality of second monitoring areas 132 are arranged on the second inner wall 12. Each monitoring area 13 is provided with a plurality of monitoring points 133 arranged in a matrix. The detection device 20 includes: a plurality of detection modules 21, a data acquisition module 22, a calculation module 23 and a deviation judgment module 24.

[0054] The plurality of detection modules 21 correspond one-to-one to the plurality of monitoring points 133 and are used to detect the static pressure values ​​of the corresponding monitoring points 133; The data acquisition module 22 is used to obtain the static pressure values ​​of multiple monitoring points 133 on each inner wall; a calculation module 23, configured to calculate a first average value, a second average value, a third average value, a fourth average value, a fifth average value, and a sixth average value, and to calculate a variance of the static pressure value of the entire furnace 10 and a variance of the static pressure value of each monitoring area 13 of the entire furnace 10, wherein the first average value is the arithmetic average of the static pressure values ​​of all monitoring points 133, the second average value and the third average value are respectively the arithmetic averages of the static pressure values ​​of the multiple monitoring points 133 of the first inner wall 11 and the multiple monitoring points 133 of the second inner wall 12, the fourth average value is the arithmetic average of the static pressure values ​​of the multiple monitoring points 133 of each monitoring area 13, the fifth average value is the arithmetic average of the static pressure values ​​of the multiple monitoring points 133 of each first monitoring area 131, and the sixth average value is the arithmetic average of the static pressure values ​​of the multiple monitoring points 133 of each second monitoring area 132; The deviation judgment module 24 is used to determine that the flue gas flow field deviates from the design expectation when the variance of the static pressure value of the entire furnace 10 is greater than the first preset variance, and / or to determine that the flue gas flow field deviates from the design expected section when the variance of the static pressure value of each monitoring area 13 of the entire furnace 10 is greater than the second preset variance.

[0055] Specifically, the multiple detection modules 21 in the detection device 20 correspond one-to-one to the multiple monitoring points 133, and are used to detect the static pressure values ​​of the corresponding monitoring points 133; the data acquisition module 22 is used to receive the static pressure values ​​of the multiple detection modules 21 and transmit them to the calculation module 23. The calculation module 23 calculates the static pressure value of the entire furnace 10 and the variance of the static pressure value of each monitoring area 13 of the entire furnace 10 and transmits them to the deviation judgment module 24. The deviation judgment module 24 determines whether the flue gas flow field deviates from the design expectation by judging whether the static pressure value of the entire furnace 10 is greater than the first preset variance, and determines whether the flue gas flow field deviates from the design expected section by judging whether the variance of the static pressure value of each monitoring area 13 of the entire furnace 10 is greater than the second preset variance.

[0056] It is understood that this device corresponds to the aforementioned embodiment of the method for detecting the hot flow field of flue gas within the boiler furnace 10 and is capable of executing each of the steps involved in the aforementioned method embodiment. The specific functions of this device can be found in the description above, and a detailed description is omitted here to avoid repetition. The device includes at least one software functional module that can be stored in a memory in the form of software or firmware or embedded in the device's operating system.

[0057] According to the detection device 20 of the present invention, real-time monitoring and analysis of the hot flow field of flue gas in the furnace 10 of the double-tangential circle boiler 100 can be achieved, thereby making the test results more real and comprehensive, and helping to promptly discover and solve actual problems in boiler operation.

[0058] According to some embodiments of the present invention, referring to Figure 3-Figure 6 The furnace 10 includes a fin 14, each having a through hole 141 extending through the fin 14 along its thickness. The through hole 141 communicates with the interior of the furnace 10. The detection module 21 is adapted to be fixed to the side of the fin 14 facing away from the boiler furnace 10, and is configured to detect the static pressure of the flue gas at the location of the through hole 141. The through hole 141 communicates with the interior of the furnace 10, allowing the flue gas within the furnace 10 to enter the detection module 21 through the through hole 141, thereby enabling the detection module 21 to detect the static pressure of the flue gas. Furthermore, the detection module 21 is adapted to be fixed to the side of the fin 14 facing away from the furnace 10, enabling detection during boiler operation without damaging the detection module 21. This overcomes the drawback that the test results of the cold-state aerodynamic characteristics of the boiler differ significantly from the actual results during hot-state operation, making comparison and analysis difficult.

[0059] It should be noted that the fin 14 is the connecting portion between two adjacent water-cooling tubes 15 , and the through hole 141 of the fin 14 is the aforementioned monitoring point 133 .

[0060] According to some embodiments of the present invention, referring to Figure 6The detection module 21 includes: a metal tube 211 and a pressure sensor. An air passage 2116 is formed inside the metal tube 211, and the air passage 2116 is suitable for being connected to the through hole 141. A first interface 2113 that is connected to the air passage 2116 is formed on the metal tube 211. The pressure sensor is fixedly connected to the metal tube 211 via the first interface 2113. The pressure sensor is used to detect the static pressure of the flue gas in the boiler furnace 10. The metal tube 211 provides a mounting platform for the pressure sensor. Specifically, when the detection module 21 detects the static pressure of the flue gas, the flue gas enters the air passage 2116 through the through hole 141, and then enters the pressure sensor through the first interface 2113. The pressure sensor detects and reads the static pressure value online, thereby realizing the static pressure detection function.

[0061] According to some embodiments of the present invention, referring to Figure 6 The metal tube 211 includes a main tube 2111, a branch tube 2112, and a plugging member 2115. The first end of the main tube 2111 is configured to be fixed to the fin 14. The main tube 2111 defines a first channel therein, which is adapted to communicate with the through-hole 141. The branch tube 2112 is arranged at an angle to the main tube 2111, and the first end of the branch tube 2112 is connected to the main tube 2111. The branch tube 2112 defines a second channel therein, which communicates with the first channel. A first interface 2113 is formed on the branch tube 2112. The plugging member 2115 is used to seal the second ends of the main tube 2111 and the second ends of the branch tube 2112. It is understood that the second ends of both the main tube 2111 and the branch tube 2112 are blocked, thereby ensuring the accuracy of the static pressure value and preventing flue gas from flowing out of the furnace 10 through the gas passage 2116, thereby improving boiler operation safety.

[0062] Here, “the branch pipe 2112 and the main pipe 2111 are arranged at an angle” can be understood as follows: the branch pipe 2112 and the main pipe 2111 can be arranged vertically or non-vertically, and the specific angle can be designed according to actual conditions.

[0063] According to some embodiments of the present invention, blocking member 2115 is detachably connected to main pipe 2111 and / or branch pipe 2112. It is understood that blocking member 2115 may be detachably connected only to main pipe 2111, only to branch pipe 2112, or both to main pipe 2111 and branch pipe 2112. In this way, if blockage occurs in through hole 141 and the first and second channels, blocking member 2115 can be removed and foreign matter can be manually cleared from metal pipe 211, thereby ensuring the normal operation of the detection system.

[0064] According to the double-cut circle boiler 100 of the third embodiment of the present invention, it includes: a furnace 10 and a detection device 20 according to the second embodiment of the present invention, the furnace 10 includes a first inner wall 11 and a second inner wall 12 arranged relatively in the left-right direction, the inner wall of the furnace 10 includes a plurality of monitoring areas 13 arranged in the up-down direction, each monitoring area 13 includes: a first monitoring area 131 and a second monitoring area 132, the plurality of first monitoring areas 131 are located on the first inner wall 11, and the plurality of second monitoring areas 132 are located on the second inner wall 12, and the first monitoring area 131 and the second monitoring area 132 are both provided with a plurality of monitoring points 133 arranged in a matrix.

[0065] Specifically, the detection device 20 is used to detect and analyze the static pressure values ​​of multiple monitoring points 133 to confirm whether the flue gas flow field in the furnace 10 is offset, thereby helping the staff to discover and solve actual problems in the operation of the boiler, thereby ensuring the reliability of the boiler operation process. Specifically, the multiple detection modules 21 in the detection device 20 correspond one-to-one to the multiple monitoring points 133, and are used to detect the static pressure values ​​of the corresponding monitoring points 133; the data acquisition module 22 is used to receive the static pressure values ​​of the multiple detection modules 21 and transmit them to the calculation module 23. The calculation module 23 calculates the static pressure value of the entire furnace 10 and the variance of the static pressure value of each monitoring area 13 of the entire furnace 10 and transmits it to the deviation judgment module 24. The deviation judgment module 24 judges whether the flue gas flow field deviates from the design expectation by judging whether the static pressure value of the entire furnace 10 is greater than the first preset variance, and judges whether the flue gas flow field deviates from the design expectation cross section by judging whether the variance of the static pressure value of each monitoring area 13 of the entire furnace 10 is greater than the second preset variance.

[0066] According to the double tangential circle boiler 100 of the embodiment of the present invention, the overall performance of the double tangential circle boiler 100 is improved by providing the detection device 20 of the second embodiment.

[0067] According to some embodiments of the present invention, referring to Figure 6 The furnace 10 also includes: fins 14, on which are formed through-holes 141 that pass through the fins 14 along the thickness direction of the fins 14; the detection module 21 also includes a metal tube 211, an air passage 2116 is formed inside the metal tube 211, the air passage 2116 is suitable for being connected to the through-hole 141, and a second interface 2114 that is connected to the air passage 2116 is formed on the metal tube 211; the double-tangential boiler 100 also includes: an injection assembly, which is suitable for providing gas to the air passage 2116 through the second interface 2114. In this way, foreign matter accumulated in the metal tube 211 can be cleaned by gas, thereby ensuring the normal operation of the detection system. It should be noted that the gas ejected by the injection assembly is compressed air, wherein the compressed air has a certain pressure, thereby better cleaning foreign matter in the metal tube 211.

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0070] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0071] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0072] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for detecting the hot flow field of flue gas in a double tangential circle boiler furnace, characterized in that: The furnace (10) comprises a first inner wall (11) and a second inner wall (12) arranged opposite to each other in a left-right direction, the inner wall of the furnace (10) comprises a plurality of monitoring areas (13) arranged in an up-down direction, each monitoring area (13) comprises: a first monitoring area (131) and a second monitoring area (132), a plurality of the first monitoring areas (131) are located on the first inner wall (11), a plurality of the second monitoring areas (132) are located on the second inner wall (12), and the first monitoring areas (131) and the second monitoring areas (132) are both provided with a plurality of monitoring points (133) arranged in a matrix. The method comprises: Step S1, obtaining the static pressure values ​​of all monitoring points (133); Step S2, based on the static pressure values ​​of all monitoring points (133), calculating a first average value, a second average value, a third average value, a fourth average value, a fifth average value and a sixth average value, wherein the first average value is the arithmetic average value of the static pressure values ​​of all monitoring points (133), the second average value and the third average value are the arithmetic average values ​​of the static pressure values ​​of multiple monitoring points (133) of the first inner wall (11) and multiple monitoring points (133) of the second inner wall (12), respectively, the fourth average value is the arithmetic average value of the static pressure values ​​of multiple monitoring points (133) of each monitoring area (13), the fifth average value is the arithmetic average value of the static pressure values ​​of multiple monitoring points (133) of each first monitoring area (131), and the sixth average value is the arithmetic average value of the static pressure values ​​of multiple monitoring points (133) of each second monitoring area (132); Step S3, calculating the variance of the static pressure value of the entire furnace (10) based on the first average value, the second average value, and the third average value, and determining that the flue gas flow field deviates from the design expectation when the variance of the static pressure value of the entire furnace (10) is greater than the first preset variance; Based on the fourth average value, the fifth average value and the sixth average value, the variance of the static pressure value of each monitoring area (13) of the entire furnace (10) is calculated, and when the variance of the static pressure value of each monitoring area (13) of the entire furnace (10) is greater than the second preset variance, it is determined that the flue gas flow field deviates from the designed expected cross-section.

2. The method for detecting the hot flow field of flue gas in the furnace of a double tangential circle boiler according to claim 1, characterized in that: Step S3 includes: Using formula (1), calculate the variance of the static pressure value of the entire furnace (10) , （1） in, is the first average value; is the second average value; is the third average value; Using formula (2), calculate the variance of the static pressure value of each monitoring area (13) in the entire furnace (10): , （2） in, is the fourth average value of the jth monitoring area (13); is the fifth average value of the j-th first monitoring area (131); is the sixth average value of the j-th second monitoring area (132).

3. The method for detecting the hot flow field of flue gas in the furnace of a double tangential circle boiler according to claim 1, characterized in that: The plurality of monitoring points (133) on the first inner wall (11) and the plurality of monitoring points (133) on the second inner wall (12) are symmetrically arranged about a center line in the left-right direction of the boiler furnace (10).

4. A device for detecting the hot flow field of flue gas in a double tangential circle boiler furnace, characterized in that: The furnace (10) comprises a first inner wall (11) and a second inner wall (12) arranged opposite to each other in a left-right direction, the furnace (10) comprises a plurality of monitoring areas (13) arranged in an up-down direction, the plurality of monitoring areas (13) comprising: a plurality of first monitoring areas (131) and a plurality of second monitoring areas (132), the plurality of first monitoring areas (131) being arranged on the first inner wall (11), the plurality of second monitoring areas (132) being arranged on the second inner wall (12), each of the monitoring areas (13) being provided with a plurality of monitoring points (133) arranged in a matrix, and the detection device (20) comprising: A plurality of detection modules (21), each of the plurality of detection modules (21) corresponds to a plurality of monitoring points (133) on a one-to-one basis and is used to detect static pressure values ​​of corresponding monitoring points (133); A data acquisition module (22) is used to obtain static pressure values ​​of multiple monitoring points (133) on each inner wall; A calculation module (23) is used to calculate a first average value, a second average value, a third average value, a fourth average value, a fifth average value and a sixth average value, and to calculate the variance of the static pressure value of the entire furnace (10) and the variance of the static pressure value of each monitoring area (13) of the entire furnace (10), wherein the first average value is the arithmetic average value of the static pressure values ​​of all monitoring points (133), the second average value and the third average value are respectively the arithmetic average values ​​of the static pressure values ​​of multiple monitoring points (133) of the first inner wall (11) and multiple monitoring points (133) of the second inner wall (12), the fourth average value is the arithmetic average value of the static pressure values ​​of multiple monitoring points (133) of each monitoring area (13), the fifth average value is the arithmetic average value of the static pressure values ​​of multiple monitoring points (133) of each first monitoring area (131), and the sixth average value is the arithmetic average value of the static pressure values ​​of multiple monitoring points (133) of each second monitoring area (132); A deviation judgment module (24) is used to determine that the flue gas flow field deviates from the design expectation when the variance of the static pressure value of the entire furnace (10) is greater than a first preset variance, and / or to determine that the flue gas flow field deviates from the design expectation cross-section when the variance of the static pressure value of each monitoring area (13) of the entire furnace (10) is greater than a second preset variance.

5. The device for detecting the hot flow field of flue gas in the furnace of a double tangential circle boiler according to claim 4, characterized in that: The furnace (10) comprises a fin (14), wherein a through hole (141) is formed on the fin (14) and passes through the fin (14) along the thickness direction of the fin (14), and the through hole (141) is connected to the internal space of the furnace (10). The detection module (21) is suitable for being fixed on a side of the fin (14) facing away from the boiler furnace (10), and is used for detecting the static pressure of the flue gas at the position of the through hole (141).

6. The device for detecting the hot flow field of flue gas in the furnace of a double tangential circle boiler according to claim 5, characterized in that: The detection module (21) comprises: a metal tube (211), an air passage (2116) formed inside the metal tube (211), the air passage (2116) being adapted to communicate with the through hole (141), and a first interface (2113) communicating with the air passage (2116) being formed on the metal tube (211); A pressure sensor is fixedly connected to the metal pipe (211) via the first interface (2113), and the pressure sensor is used to detect the static pressure of the flue gas in the boiler furnace (10).

7. The device for detecting the hot flow field of flue gas in the furnace of a double tangential circle boiler according to claim 6, characterized in that: The metal tube (211) comprises: a main pipe (2111), wherein a first end of the main pipe (2111) is configured to be fixed to the fin (14), and a first channel is formed in the main pipe (2111), and the first channel is adapted to be in communication with the through hole (141); a branch pipe (2112), the branch pipe (2112) being arranged at an angle to the main pipe (2111), and a first end of the branch pipe (2112) being connected to the main pipe (2111), a second channel being formed in the branch pipe (2112) and being connected to the first channel, and the first interface (2113) being formed on the branch pipe (2112); A blocking member (2115) is used to block the second end of the main pipe (2111) and the second end of the branch pipe (2112).

8. The device for detecting the hot flow field of flue gas in the furnace of a double tangential circle boiler according to claim 7, characterized in that: The blocking member (2115) is detachably connected to the main pipe (2111) and / or the branch pipe (2112).

9. A double tangential circle boiler, characterized in that: include: A furnace (10), the furnace (10) comprising a first inner wall (11) and a second inner wall (12) arranged opposite to each other in a left-right direction, the inner wall of the furnace (10) comprising a plurality of monitoring areas (13) arranged in an up-down direction, each monitoring area (13) comprising: a first monitoring area (131) and a second monitoring area (132), a plurality of the first monitoring areas (131) being located on the first inner wall (11), a plurality of the second monitoring areas (132) being located on the second inner wall (12), and a plurality of monitoring points (133) arranged in a matrix are provided in each of the first monitoring areas (131) and the second monitoring areas (132); The detection device (20) according to any one of claims 4 to 8.

10. The double tangential circle boiler according to claim 9, characterized in that: The furnace (10) further comprises: a fin (14), wherein the fin (14) is formed with a through hole (141) penetrating the fin (14) along the thickness direction of the fin (14), The detection module (21) further comprises a metal tube (211), an air passage (2116) is formed inside the metal tube (211), the air passage (2116) is adapted to be connected to the through hole (141), and a second interface (2114) is formed on the metal tube (211) and is in communication with the air passage (2116). The double tangential circle boiler further comprises: an injection assembly, wherein the injection assembly is adapted to provide gas to the gas channel (2116) through the second interface (2114).

Images