Method for monitoring adherent atmosphere of water cooling wall of boiler and boiler system

Abstract

The invention discloses a boiler water-cooled wall adherent atmosphere monitoring method and a boiler system. The boiler water-cooled wall adherent atmosphere monitoring method comprises the following steps: S1, constructing a flue gas component prediction equation database of all working conditions of a monitored boiler; s2, acquiring flue gas component real data of sampling points on the boiler, and acquiring a corresponding flue gas component prediction equation according to the flue gas component real data of the sampling points; and S3, according to the flue gas component real data of the sampling point and the corresponding flue gas component prediction equation, flue gas component prediction data of the prediction point are obtained, and the flue gas component real data of the sampling point and the flue gas component prediction data of the prediction point form adherent atmosphere monitoring data of the water cooling wall. According to the method for monitoring the adherent atmosphere of the water cooling wall of the boiler, the real data of the sampling points and the prediction data of the prediction points are combined, so that the adherent atmosphere of the water cooling wall of the boiler can be comprehensively monitored, and the accuracy degree of judging the corrosivity of the adherent atmosphere of the water cooling wall is improved.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to a method for monitoring the atmosphere of a boiler water-cooled wall and a boiler system. Background Art

[0002] Coal-fired boilers are used to control nitrogen oxides (NO x ) Emissions generally use air classification, low NO x Low-nitrogen combustion technologies such as burners can effectively reduce NO by controlling the amount of oxygen in the initial stage of coal combustion. x The formation of sulfur, but also aggravates the high-temperature corrosion problem of the water-cooled wall, especially the boiler burning high-sulfur coal is more prone to water-cooled wall tube burst and other accidents. During the combustion of pulverized coal, sulfur is mainly released in the form of H2S, which is then oxidized to SO2. However, in the oxygen-deficient reducing atmosphere, H2S cannot be completely oxidized to SO2, so it is easy to form a high H2S concentration area on the wall. H2S is highly corrosive and can react with Fe and FeO on the tube wall to form FeS. In addition, the temperature of the main combustion zone of the furnace is high, which further aggravates the corrosion reaction of the water-cooled wall.

[0003] Therefore, monitoring the corrosive atmosphere in the water-cooled wall area has become a key issue in the safety protection of the heating surface tube wall of a coal-fired boiler.

[0004] The wall atmosphere monitoring of coal-fired boilers usually adopts the flue gas sampling and testing method. When selecting the location of the flue gas sampling point, it is necessary to consider the influence of the ring beam and support beam on the sampling duct. At the same time, the insulation structure of the boiler must be maintained. In addition, considering the construction volume and economic cost of flue gas sampling, the flue gas sampling point cannot cover the entire water-cooled wall.

[0005] However, due to the different flame heights and combustion oxygen amounts under different working conditions, the locations of high-risk areas for high-temperature corrosion are also different. Judging the corrosiveness of the wall-attached atmosphere through local measuring points is not comprehensive, and the accuracy of judging the corrosiveness of the wall-attached atmosphere is low. Summary of the invention

[0006] 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 boiler water-cooled wall atmosphere monitoring method, which can realize all-round monitoring of the water-cooled wall.

[0007] The present invention also provides a boiler system using the above boiler water-cooled wall atmosphere monitoring method.

[0008] According to the first aspect of the present invention, the method for monitoring the atmosphere of a water-cooled wall of a boiler is provided with a plurality of sampling points, and the water-cooled wall is further divided into a plurality of prediction points, and the sampling points and the prediction points are staggered on the water-cooled wall. The method for monitoring the atmosphere of a water-cooled wall of a boiler comprises: S1, constructing a flue gas component prediction equation database for all operating conditions of the monitored boiler; S2, obtaining the real data of the flue gas components of the sampling points on the boiler, and obtaining the corresponding flue gas component prediction equations in the flue gas component prediction equation database according to the real data of the flue gas components of the sampling points; S3, obtaining the predicted data of the flue gas components at the prediction points according to the real data of the flue gas components at the sampling points and the corresponding flue gas component prediction equations, and the real data of the flue gas components at the sampling points and the predicted data of the flue gas components at the prediction points constitute the monitoring data of the atmosphere of the water-cooled wall.

[0009] According to the boiler water-cooled wall atmosphere monitoring method of the first aspect of the present invention, by combining the real data of the sampling point and the predicted data of the prediction point, it is possible to realize all-round monitoring of the boiler water-cooled wall atmosphere. When judging the corrosiveness of the water-cooled wall atmosphere, the reference water-cooled wall atmosphere monitoring data is highly consistent with the actual water-cooled wall atmosphere, thereby improving the accuracy of judging the corrosiveness of the water-cooled wall atmosphere.

[0010] According to some embodiments of the present invention, step S1 includes: S11, constructing a water-cooled wall atmosphere database of the monitored boiler under all operating conditions; S12, dividing the working process of the boiler into N1 calculation conditions within the full operating range of the boiler;

[0011] S13. Under the same calculation condition, obtain the real data of the flue gas components at the sampling point on the boiler, and obtain the flue gas component data of the prediction point in the water-cooled wall atmosphere database; S14. Calculate the correspondence between the real data of the flue gas components at the sampling point and the flue gas component data at the prediction point to obtain the flue gas component prediction equation of the monitored boiler under the condition; S15. Repeat steps S12 and S13, and calculate the flue gas component prediction equations corresponding to N1 calculation conditions respectively, to obtain the flue gas component prediction equation database of the full working conditions of the monitored boiler.

[0012] According to some embodiments of the present invention, N1 workload ratios are divided within the full-operating-condition workload interval of the boiler, and the full-operating condition of the boiler is divided into N1 calculation conditions using the N1 workload ratios as variables.

[0013] According to some embodiments of the present invention, step S11 includes: S111, constructing a simulation model of the monitored boiler in simulation software; S112, simulating the combustion process of the boiler under full operating conditions in the simulation model, and obtaining combustion simulation data of the boiler under full operating conditions; S113, recording the flue gas component data of the predicted points corresponding to all the calculated operating conditions to obtain a water-cooled wall atmosphere database of the monitored boiler under full operating conditions.

[0014] According to some embodiments of the present invention, step S111 includes: S1111, constructing an initial model; S1112, operating the boiler under comparative working conditions, and obtaining real data of flue gas components at the sampling points on the boiler, simulating the combustion process of the boiler under the comparative working conditions in the initial model, and obtaining simulation data of the flue gas components at the sampling points in the initial model; S1113, comparing the real data and simulation data of the flue gas components at the sampling points under the comparative working conditions. If the deviation between the simulation data and the real data is less than or equal to 5%, the initial model is a simulation model, and step S112 is entered. If the deviation between the simulation data and the real data is greater than 5%, the parameters in the initial model are adjusted, and steps S1112 and S1113 are repeated.

[0015] According to some embodiments of the present invention, step S2 includes: S21, obtaining flue gas at a sampling point; S22, performing dust removal and dehumidification pretreatment on the obtained flue gas; S23, detecting flue gas components to obtain flue gas component data at the sampling point.

[0016] According to some embodiments of the present invention, the flue gas component data includes: concentrations of O2, CO and H2S.

[0017] According to the boiler system of the second aspect of the present invention, the above-mentioned boiler water-cooled wall atmosphere monitoring method according to the first aspect of the present invention is applied, and the boiler system includes: a boiler, the boiler has a furnace, the water-cooled wall is arranged on the inner wall of the furnace, and an openable sampling hole is formed on the water-cooled wall, and the sampling hole is formed as the sampling point; a flue gas analysis device, the flue gas analysis device is suitable for being connected to the sampling hole; and a server, the server is electrically connected to the flue gas analysis device.

[0018] According to the boiler system of the second aspect of the present invention, by applying the boiler water-cooled wall atmosphere monitoring method according to the first aspect of the present invention, the accuracy of judging the corrosiveness of the water-cooled wall atmosphere can be improved, thereby improving the reliability of the boiler system during operation.

[0019] According to some embodiments of the present invention, the boiler system further comprises: a flue gas duct and a flue gas filter, the flue gas duct is connected between the sampling hole and the flue gas analysis device, and the flue gas filter is serially connected to the flue gas duct.

[0020] According to some embodiments of the present invention, the flue gas analysis device includes: an O2 analyzer, a CO analyzer and a H2S analyzer, the O2 analyzer is used to analyze the O2 concentration in the flue gas, the CO analyzer is used to analyze the CO concentration in the flue gas, and the H2S analyzer is used to analyze the H2S concentration in the flue gas.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flow chart of a method for monitoring boiler water wall atmosphere according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Flow chart of step S1 shown in FIG.

[0024] Figure 3 yes Figure 2 The flowchart of step S11 shown in FIG.

[0025] Figure 4 yes Figure 3 The flowchart of step S111 shown in FIG.

[0026] Figure 5 yes Figure 1 The flowchart of step S2 shown in FIG.

[0027] Figure 6 is a schematic diagram of a boiler system according to an embodiment of the present invention;

[0028] Figure 7 yes Figure 6 Schematic diagram of the boiler shown in .

[0029] Reference numerals:

[0030] 100. Boiler system;

[0031] 10. Boiler; 11. Water-cooled wall; 12. Sampling point; 13. Prediction point; 14. Burner; 15. Burnout air nozzle;

[0032] 20. Flue gas analysis device; 21. O2 analyzer; 22. CO analyzer; 23. H2S analyzer;

[0033] 30. Server;

[0034] 40. Flue gas duct;

[0035] 50. Flue gas filter. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which 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 be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] Reference below Figure 1-Figure 7 A method for monitoring the atmosphere of a water-cooled wall 11 of a boiler 10 according to an embodiment of the first aspect of the present invention is described.

[0038] like Figure 1 , Figure 6 and Figure 7 As shown, according to the method for monitoring the atmosphere of the water-cooled wall 11 of a boiler 10 according to the first aspect of the present invention, a plurality of sampling points 12 are provided on the water-cooled wall 11, and a plurality of prediction points 13 are also divided into the water-cooled wall 11, and the sampling points 12 and the prediction points 13 are staggered on the water-cooled wall 11.

[0039] It can be understood that the flue gas component data monitored at the sampling point 12 is the real data at the sampling point 12. The flue gas component data at the sampling point 12 cannot truly reflect the flue gas component data in the non-sampling point 12 area. The non-sampling point 12 area on the water-cooled wall 11 is divided into multiple areas, and a single area is the prediction point 13.

[0040] The method for monitoring the atmosphere of the water-cooled wall 11 of the boiler 10 includes:

[0041] S1. Construct a flue gas composition prediction equation database for all operating conditions of the monitored boiler 10.

[0042] The smoke component prediction equation is the correspondence between the smoke component data of the prediction point 13 and the real smoke component data of the corresponding sampling point 12 . The prediction point 13 can correspond to a single sampling point 12 , or a combination of multiple sampling points 12 .

[0043] S2. Acquire the real data of the flue gas components at the sampling point 12 on the boiler 10, and acquire the corresponding flue gas component prediction equation in the flue gas component prediction equation database according to the real data of the flue gas components at the sampling point 12.

[0044] During the monitoring of the water-cooled wall 11, the flue gas at the sampling point 12 is collected, and the flue gas analysis device 20 analyzes the collected flue gas to obtain the flue gas component data at the sampling point 12, wherein the sampling points 12 and the prediction points 13 are pre-grouped in the server 30, and a group of sampling points 12 corresponds to a group of prediction points 13. The server 30 receives the data transmitted by the flue gas analysis device 20 and compares it, and obtains the corresponding flue gas component prediction equation in the flue gas component prediction equation database of the full operating conditions of the monitored boiler 10.

[0045] Among them, the flue gas sampling and composition testing process should comply with the "Technical Guidelines for Wall Atmosphere Testing in High-Temperature Corrosion Zones of Water-Cooled Walls of Coal-Fired Boilers 10" (T / CSEE 0182-2021), and the number and location of sampling points 12 should be determined according to different furnace types such as opposed combustion, four-corner cut-circle or W-type boilers 10. The number of sampling points 12 shall not be less than 20.

[0046] S3. According to the real data of the flue gas components at the sampling point 12 and the corresponding flue gas component prediction equation, the predicted data of the flue gas components at the prediction point 13 are obtained. The real data of the flue gas components at the sampling point 12 and the predicted data of the flue gas components at the prediction point 13 constitute the wall atmosphere monitoring data of the water-cooled wall 11.

[0047] After the server 30 obtains the flue gas component prediction equation, the server 30 calculates the real data of the flue gas component at the sampling point 12 and the corresponding flue gas component prediction equation to obtain the flue gas component prediction data at the prediction point 13. The server 30 repeats the above steps to calculate the flue gas component prediction data of all the prediction points 13 in turn, and outputs the all-round wall atmosphere data of the water-cooled wall 11 composed of the real data of the flue gas component at the sampling point 12 and the flue gas component prediction data, thereby realizing all-round monitoring of the wall atmosphere of the water-cooled wall 11.

[0048] Therefore, in the process of monitoring the atmosphere attached to the water-cooled wall 11, the monitoring data of the water-cooled wall 11 can more truly reflect the actual situation of the surface of the water-cooled wall 11. When judging the corrosiveness of the atmosphere attached to the water-cooled wall 11, the basis for judgment is more realistic. In this way, the accuracy of judging the corrosiveness of the atmosphere attached to the water-cooled wall 11 can be improved.

[0049] According to the method for monitoring the atmosphere of the water-cooled wall 11 of the boiler 10 in the first aspect of the present invention, by combining the real data of the sampling point 12 and the predicted data of the prediction point 13, it is possible to realize all-round monitoring of the atmosphere of the water-cooled wall 11 of the boiler 10 in the wall. When judging the corrosiveness of the atmosphere of the water-cooled wall 11 in the wall, the reference monitoring data of the water-cooled wall atmosphere data is highly consistent with the actual atmosphere of the water-cooled wall 11 in the wall, thereby improving the accuracy of judging the corrosiveness of the atmosphere of the water-cooled wall 11 in the wall.

[0050] In some embodiments of the present invention, Figure 2 As shown, step S1 includes:

[0051] S11, constructing a database of the atmosphere of the water-cooled wall 11 of the monitored boiler 10 under all operating conditions.

[0052] Among them, the water-cooled wall 11 wall atmosphere database includes the water-cooled wall 11 wall atmosphere data of the boiler 10 under all operating conditions. The water-cooled wall 11 wall atmosphere database can be obtained by collecting data on the actual operating conditions of the boiler 10, and the water-cooled wall 11 wall atmosphere database can also be obtained by simulating the operating conditions of the boiler 10. The water-cooled wall 11 wall atmosphere data includes each water-cooled wall 11 around the combustion area. The data points on each water-cooled wall 11 are spaced at intervals of 0.2 to 1 meter, and the flue gas component data of the point is stored.

[0053] S12, dividing the working process of the boiler 10 into N1 calculation conditions within the full working condition range of the boiler 10.

[0054] Among them, the calculation conditions include full-load operating conditions from the lowest stable combustion condition to the maximum evaporation condition of the boiler 10. For example, in the working load range of the boiler 10 from 20% load to 100% load, one condition is selected at every 2% load interval, and a total of 41 calculation conditions are divided.

[0055] S13, under the same calculation condition, obtain the real data of the flue gas composition at the sampling point 12 on the boiler 10, and obtain the flue gas composition data at the prediction point 13 in the wall atmosphere database of the water-cooled wall 11;

[0056] S14, calculating the correspondence between the actual data of the flue gas components at the sampling point 12 and the data of the flue gas components at the prediction point 13, so as to obtain a prediction equation for the flue gas components of the monitored boiler 10 under the working condition.

[0057] Among them, one sampling point 12 can correspond to multiple prediction points 13, or a combination of multiple sampling points 12 can correspond to a combination of multiple prediction points 13. When calculating the correspondence between the real data of the smoke components at the sampling point 12 and the smoke component data at the prediction point 13, multivariate linear regression analysis is used for calculation.

[0058] S15 . Repeat steps S12 and S13 to respectively calculate the flue gas component prediction equations corresponding to N1 calculation conditions, so as to obtain a flue gas component prediction equation database for all conditions of the monitored boiler 10 .

[0059] Exemplarily, the water-cooled wall 11 includes: a front wall, a rear wall, a left wall and a right wall, the front wall, the rear wall, the left wall and the right wall enclose a combustion area, and the flue gas component data include: the concentrations of O2, CO and H2S.

[0060] Take a single prediction point 13 as an example: if the point is located on the left wall or the right wall, select 9 sampling points 12 on the left wall or the right wall at the three nearest horizontal heights (such as Figure 4As shown in the figure, the O2, CO and H2S component data of 9 points (a total of 27 data) are used as independent variables, and the O2, CO and H2S component data of the prediction point 13 are used as dependent variables, and the multivariate regression coefficient matrix is ​​calculated by the least square method; if the point is located on the front wall, 10 sampling points 12 in the two vertical directions on the left wall or the right wall are selected, and the O2, CO and H2S component data of the 10 points (a total of 30 data) are used as independent variables; if the point is located on the back wall, 10 sampling points 12 in the two vertical directions on the left wall or the right wall are selected, and the O2, CO and H2S component data of the 10 points (a total of 30 data) are used as independent variables. Through the above method, the O2, CO and H2S component calculation coefficient matrix of any prediction point 13 in the combustion zone wall area can be obtained, that is, the flue gas component prediction equation of any prediction point 13 in the combustion zone wall area can be obtained, and a total of 8000 flue gas component prediction equations of all prediction points 13 can be stored in the server 30.

[0061] Therefore, the flue gas component prediction equation database can be obtained by processing the water-cooled wall 11 wall atmosphere database. During the operation of the server 30, the amount of data calculated is relatively small, which can increase the speed of data output during the water-cooled wall 11 monitoring process.

[0062] In some embodiments of the present invention, N1 workload ratios are divided within the full-operating load interval of the boiler 10, and the full operating condition of the boiler 10 is divided into N1 calculation conditions using the N1 workload ratios as variables.

[0063] The workload ratio is relatively easy to adjust during actual operation, and the adjustment accuracy is relatively high, thereby improving the data accuracy in the process of constructing the flue gas component prediction equation database and the water-cooled wall 11 wall atmosphere database.

[0064] Exemplarily, within the working load range of the boiler 10 from 20% load to 100% load, one working condition is selected at every 2% load interval, and a total of 41 calculation working conditions are divided.

[0065] In some embodiments of the present invention, Figure 3 As shown, step S11 includes:

[0066] S111 . Construct a simulation model of the monitored boiler 10 in simulation software.

[0067] S112, simulating the combustion process of the boiler 10 under full working conditions in the simulation model, and obtaining combustion simulation data of the boiler 10 under full working conditions;

[0068] S113, recording the flue gas component data of the prediction point 13 corresponding to all calculation conditions, so as to obtain a database of the water-cooled wall 11 atmosphere of the monitored boiler 10 under all conditions.

[0069] Exemplarily, the water-cooled wall 11 includes: a front wall, a rear wall, a left wall and a right wall, the front wall, the rear wall, the left wall and the right wall enclose a combustion area, and the flue gas component data include: the concentrations of O2, CO and H2S.

[0070] In the working load range of the boiler 10 from 20% load to 100% load, one working condition is selected every 2% load interval, and a total of 41 calculation working conditions are divided. In each simulated combustion process, the O2, CO and H2S concentration data of the flue gas in the wall area of ​​each water-cooled wall 11 are obtained. Each wall surface is divided into 40 grids in the vertical direction and 20 grids in the horizontal direction, and a total of 800 data points are obtained, and a total of 3200 points on the four walls are taken as prediction points 13. According to the O2, CO and H2S concentration data of each point, a water-cooled wall 11 wall atmosphere database is established.

[0071] Therefore, by constructing a water-cooled wall 11 wall atmosphere database through simulation, the difficulty of constructing the water-cooled wall 11 wall atmosphere database can be reduced, and the cost of constructing the water-cooled wall 11 wall atmosphere database can be reduced.

[0072] In some embodiments of the present invention, Figure 4 As shown, step S111 includes:

[0073] S1111. Build an initial model.

[0074] For example, Ansys Fluent software is used to establish a three-dimensional numerical calculation initial model for the combustion area of ​​the boiler 10, the three-dimensional area of ​​the combustion area is divided into 1 million structural grids, and the inlet area of ​​the burner 14 is encrypted. The Realizable k-ε model is used to simulate turbulent flow, the random orbit method is used to simulate the movement of coal powder particles, the discrete coordinate method is used to simulate radiation heat transfer, the gray gas weighted sum model is used to calculate the flue gas emissivity, the eddy dissipation model is used to simulate the turbulent reaction rate, and the kinetic / diffusion control model is used to simulate the pyrolysis of coal powder and the combustion of carbon particles. The working fluid in the water-cooled wall 11 tube adopts a one-dimensional flow model, and the sulfur evolution model is used to predict the concentration distribution of H2S.

[0075] S1112, operating the boiler 10 under the comparative working condition, and obtaining the real data of the flue gas components at the sampling point 12 on the boiler 10,

[0076] The combustion process of the boiler 10 under the comparative working condition is simulated in the initial model, and the simulation data of the flue gas components at the sampling point 12 in the initial model are obtained.

[0077] Exemplarily, the comparison operating conditions include: 20% boiler 10 workload, 50% boiler 10 workload, and 100% boiler 10 workload.

[0078] S1113. Compare the real data and simulated data of the flue gas components at sampling point 12 under the working conditions.

[0079] If the deviation between the simulated data and the real data is less than or equal to 5%, the initial model is a simulation model, and the process goes to step S112.

[0080] If the deviation between the simulated data and the real data is greater than 5%, the parameters in the initial model are adjusted and steps S1112 and S1113 are repeated.

[0081] In this way, the similarity between the simulation model of the monitored boiler 10 and the real boiler 10 can be improved, thereby improving the similarity between the water-cooled wall 11 wall atmosphere database constructed by simulation and the water-cooled wall 11 wall atmosphere database in real state, thereby further improving the accuracy of judging the corrosiveness of the water-cooled wall 11 wall atmosphere.

[0082] In some embodiments of the present invention, Figure 5 As shown, step S2 includes:

[0083] S21, obtaining flue gas at sampling point 12;

[0084] S22, performing dust removal and dehumidification pretreatment on the obtained flue gas;

[0085] S23, detecting the smoke components to obtain smoke component data at the sampling point 12.

[0086] Therefore, on the one hand, the accuracy of the smoke analysis by the smoke analysis device 20 can be improved, and on the other hand, the pollution to the smoke analysis device 20 can be reduced and the service life of the smoke analysis device 20 can be increased.

[0087] In some embodiments of the present invention, the flue gas component data includes: the concentrations of O2, CO and H2S. O2, CO and H2S have strong corrosiveness, and by detecting the concentrations of O2, CO and H2S, the corrosiveness of the atmosphere adhering to the water-cooled wall 11 can be judged more accurately.

[0088] The boiler system 100 according to the second embodiment of the present invention applies the above-mentioned boiler 10 water-cooled wall 11 wall atmosphere monitoring method according to the first embodiment of the present invention, such as Figure 6 As shown, the boiler system 100 includes: a boiler 10 , a flue gas analysis device 20 and a server 30 .

[0089] Specifically, the boiler 10 has a furnace, a water-cooled wall 11 is arranged on the inner wall of the furnace, an openable sampling hole is formed on the water-cooled wall 11, the sampling hole is formed as a sampling point 12, the flue gas analysis device 20 is suitable for being connected to the sampling hole, and the server 30 is electrically connected to the flue gas analysis device 20.

[0090] Among them, the inner wall of the boiler 10 is provided with a burner 14 and a burnout air nozzle 15. For example, the water-cooled wall 11 includes: a front wall, a rear wall, a left wall and a right wall, and the front wall, the rear wall, the left wall and the right wall enclose a combustion area. The front wall and the rear wall are each arranged with 3 layers of burners 14, 4 swirl burners 14 are arranged on each layer, and a total of 24 swirl burners 14 are arranged. Two layers of burnout air nozzles 15 are arranged above the burners 14 on the front wall and the rear wall, respectively. Five layers of sampling points 12 are arranged on the left wall and the right wall of the boiler 10, respectively. The upper two layers of sampling points 12 are at the same horizontal elevation as the burnout air nozzles 15, and the lower three layers of sampling points 12 are at the same horizontal elevation as the burners 14. There are three sampling points 12 on each layer, which are evenly arranged along the wall width.

[0091] During the operation of the boiler 10, the burner 14 mixes the fuel and air and burns them in the combustion area, and the burnt air nozzle 15 introduces the burnt air. At the same time, the sampling point 12 collects the flue gas on the surface of the water-cooled wall 11, and the flue gas analysis device 20 analyzes the flue gas and transmits the flue gas component data to the server 30. The server 30 processes the real data of the flue gas component at the sampling point 12 to obtain the predicted data of the flue gas component at the prediction point 13. The real data of the flue gas component at the sampling point 12 and the predicted data of the flue gas component at the prediction point 13 constitute the monitoring data of the wall atmosphere of the water-cooled wall 11.

[0092] According to the boiler system 100 of the second aspect of the present invention, by applying the above-mentioned method for monitoring the atmosphere attached to the water-cooled wall 11 of the boiler 10 according to the first aspect of the present invention, the accuracy of judging the corrosiveness of the atmosphere attached to the water-cooled wall 11 can be improved, thereby improving the reliability of the boiler system 100 during operation.

[0093] In some embodiments of the present invention, Figure 6 As shown, the boiler system 100 further includes: a flue gas duct 40 and a flue gas filter 50 . The flue gas duct 40 is connected between the sampling hole and the flue gas analysis device 20 , and the flue gas filter 50 is serially connected to the flue gas duct 40 .

[0094] During the operation of the boiler system 100 , the flue gas enters the flue gas duct 40 from the sampling hole, and then passes through the flue gas filter 50 along the flue gas duct 40 and enters the flue gas analysis device 20 .

[0095] By setting up the flue gas duct 40, the transmission of flue gas between the sampling point 12 and the flue gas analysis device 20 can be realized. During the product design process, the path of the flue gas pipeline can be adjusted to meet more product design needs. By setting up the flue gas filter 50, the flue gas filter 50 can dehumidify and remove dust from the flue gas. On the one hand, the accuracy of the flue gas analysis by the flue gas analysis device 20 can be improved. On the other hand, the pollution to the flue gas analysis device 20 can be reduced, and the service life of the flue gas analysis device 20 can be improved.

[0096] Preferably, the flue gas duct 40 is a TP304 stainless steel pipe.

[0097] In some embodiments of the present invention, Figure 6 As shown, the flue gas analysis device 20 includes: an O2 analyzer 21, a CO analyzer 22 and a H2S analyzer 23. The O2 analyzer 21 is used to analyze the O2 concentration in the flue gas, the CO analyzer 22 is used to analyze the CO concentration in the flue gas, and the H2S analyzer 23 is used to analyze the H2S concentration in the flue gas.

[0098] During the operation of the boiler system 100, after passing through the flue gas filter 50, the flue gas is divided into three paths and enters the O2 analyzer 21, the CO analyzer 22 and the H2S analyzer 23 respectively. The O2 analyzer 21, the CO analyzer 22 and the H2S analyzer 23 respectively analyze the O2 concentration, CO concentration and H2S concentration of the flue gas, and transmit the O2 concentration, CO concentration and H2S concentration data to the server 30.

[0099] Among them, preferably, the O2 analyzer 21 is a zirconium oxide oxygen meter, the CO analyzer 22 is an infrared absorption analyzer, and the H2S analyzer 23 is a gas chromatography analyzer.

[0100] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships are 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, and do not indicate or imply 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.

[0101] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0102] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0104] Although the 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 present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for monitoring the atmosphere of a boiler water-cooled wall, wherein the water-cooled wall is provided with a plurality of sampling points, and the water-cooled wall is further divided into a plurality of prediction points, and the sampling points and the prediction points are staggered on the water-cooled wall, characterized in that: The boiler water-cooled wall atmosphere monitoring method comprises: S1. Construct a flue gas component prediction equation database for all operating conditions of the monitored boiler; S2. Acquire the real data of the flue gas components at the sampling point on the boiler, and acquire the corresponding flue gas component prediction equation in the flue gas component prediction equation database according to the real data of the flue gas components at the sampling point; S3. According to the real data of the flue gas components at the sampling point and the corresponding flue gas component prediction equation, the predicted data of the flue gas components at the prediction point are obtained. The real data of the flue gas components at the sampling point and the predicted data of the flue gas components at the prediction point constitute the wall atmosphere monitoring data of the water-cooled wall.

2. The method for monitoring the atmosphere of a boiler water-cooled wall according to claim 1, characterized in that: The step S1 comprises: S11, constructing a water-cooled wall atmosphere database for all operating conditions of the monitored boiler; S12, dividing the working process of the boiler into N1 calculation conditions within the full working condition range of the boiler; S13, under the same calculation condition, obtaining the real data of flue gas components at the sampling point on the boiler, and obtaining the flue gas component data at the prediction point in the water-cooled wall atmosphere database; S14, calculating the correspondence between the real data of the flue gas components at the sampling point and the data of the flue gas components at the prediction point, so as to obtain a prediction equation for the flue gas components of the monitored boiler under the working condition; S15. Repeat steps S12 and S13 to respectively calculate the flue gas component prediction equations corresponding to N1 calculation conditions, so as to obtain the flue gas component prediction equation database for all conditions of the monitored boiler.

3. The method for monitoring the atmosphere of a boiler water-cooled wall according to claim 2, characterized in that: N1 workload ratios are divided within the full working load range of the boiler, and the full working condition of the boiler is divided into N1 calculation conditions using the N1 workload ratios as variables.

4. The method for monitoring the atmosphere of a boiler water-cooled wall according to claim 2, characterized in that: The step S11 comprises: S111. constructing a simulation model of the monitored boiler in the simulation software; S112, simulating the combustion process of the boiler under full working conditions in the simulation model, and obtaining combustion simulation data of the boiler under full working conditions; S113, recording the flue gas component data of the predicted points corresponding to all the calculated operating conditions, so as to obtain a water-cooled wall atmosphere database of the monitored boiler under all operating conditions.

5. The method for monitoring the atmosphere of a boiler water-cooled wall according to claim 4, characterized in that: The step S111 comprises: S1111, constructing an initial model; S1112, operating the boiler under the comparative working condition, and obtaining the real data of the flue gas components at the sampling point on the boiler, Simulating the combustion process of the boiler under the comparative working condition in the initial model, and obtaining simulation data of the flue gas components at the sampling point in the initial model; S1113, comparing the real data and the simulated data of the flue gas components at the sampling point under the comparison conditions, If the deviation between the simulated data and the real data is less than or equal to 5%, the initial model is a simulation model, and the process goes to step S112. If the deviation between the simulated data and the real data is greater than 5%, the parameters in the initial model are adjusted and steps S1112 and S1113 are repeated.

6. The method for monitoring the atmosphere of a boiler water-cooled wall according to claim 1, characterized in that: The step S2 comprises: S21, obtaining flue gas at a sampling point; S22, performing dust removal and dehumidification pretreatment on the obtained flue gas; S23. Detect smoke components to obtain smoke component data at the sampling point.

7. The method for monitoring the atmosphere of a boiler water-cooled wall according to any one of claims 1 to 6, characterized in that: The flue gas component data include: the concentrations of O2, CO and H2S.

8. A boiler system, characterized in that: The method for monitoring the atmosphere of a water-cooled wall of a boiler according to any one of claims 1 to 7 is applied, wherein the boiler system comprises: A boiler, wherein the boiler has a furnace, the water-cooled wall is arranged on the inner wall of the furnace, an openable sampling hole is formed on the water-cooled wall, and the sampling hole is formed as the sampling point; a flue gas analysis device, the flue gas analysis device being adapted to be in communication with the sampling hole; A server is electrically connected to the flue gas analysis device.

9. The boiler system according to claim 8, characterized in that: The boiler system further comprises: a flue gas pipe and a flue gas filter, wherein the flue gas pipe is connected between the sampling hole and the flue gas analysis device, and the flue gas filter is serially connected to the flue gas pipe.

10. The boiler system according to claim 8, characterized in that The flue gas analysis device comprises: an O2 analyzer, a CO analyzer and a H2S analyzer, wherein the O2 analyzer is used to analyze the O2 concentration in the flue gas, the CO analyzer is used to analyze the CO concentration in the flue gas, and the H2S analyzer is used to analyze the H2S concentration in the flue gas.

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