Intelligent air-gas linkage control system of gas burner

Abstract

The invention relates to the technical field of combustors, in particular to an intelligent air-gas linkage control system of a fuel gas combustor. The method comprises the following steps: determining a smoke air demand reflection degree at each moment by combining a smoke particulate matter concentration value difference, a smoke temperature difference and a combustion-supporting air pressure difference at different moments corresponding to the same gas pressure, and determining a smoke air demand reflection degree at each moment by combining a difference between flame color spectrums of different luminosity detection intervals in a combustion chamber at each moment; the flame color health coefficient of flames generated in the combustion chamber at each moment is determined, and the combustion-supporting air pressure input by the combustion engine at the current moment is determined by combining the distance from a flame nozzle in the combustion chamber to the highest-temperature point of the heat exchanger at each moment and the temperature value difference between the flame nozzle and the highest-temperature point of the heat exchanger. According to the invention, self-adaptive combustion-supporting air pressure regulation and control are represented by combining flue gas and flame, so that the intelligent air-gas control effect of the combustion engine is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and in particular to an intelligent air-gas linkage control system for a gas burner. Background Art

[0002] Gas burners are industrial thermal energy devices that use natural gas as fuel and achieve efficient combustion through premixing with air. Their core function is to mix gas and air in a suitable ratio, ignite the mixture, and steadily output heat energy to the application equipment. They are widely used in curing ovens, drying ovens, and other equipment in industries such as coating and electroplating.

[0003] Gas pressure and combustion-supporting air pressure are the two core inputs to a burner. Gas pressure is adjusted based on the application's needs, while combustion-supporting air pressure determines the degree of combustion of the input gas. Traditionally, combustion-supporting air pressure is regulated based on a preset fixed ratio between gas and combustion-supporting air pressures, thereby achieving coordinated air-gas control.

[0004] Existing problem: In actual scenarios, fluctuations in gas pipeline pressure will affect the increase or decrease in the amount of gas injected into the equipment, which in turn causes a deviation between the input gas pressure and the actual gas pressure. At this time, if the air pressure is controlled by relying on a fixed ratio between the gas pressure and the combustion-supporting air pressure, the adaptation performance of the combustion-supporting air pressure and the gas pressure will be reduced, causing the flue gas and flame generated by the burner to be correlated, thereby reducing the heat supply efficiency. Summary of the Invention

[0005] The present invention provides an intelligent air-gas linkage control system for a gas burner to solve the existing problems.

[0006] The intelligent air-gas linkage control system of a gas burner of the present invention adopts the following technical solutions: An embodiment of the present invention provides an intelligent air-gas linkage control system for a gas burner, the system comprising the following modules: Data acquisition module: used to obtain gas pressure, combustion air pressure, flue gas temperature, flue gas particulate matter concentration, carbon monoxide and nitrogen oxide concentrations in the flue gas, as well as the flame color spectrum of each photometric detection interval in the combustion chamber, the distance from the flame nozzle to the highest temperature point of the heat exchanger in the combustion chamber, and the temperature values ​​of the flame nozzle and the highest temperature point of the heat exchanger at every moment during the operation of the gas burner; Flue gas air demand analysis module: used to determine the flue gas air demand at each moment based on the concentration differences of carbon monoxide and nitrogen oxides in the flue gas at the same moment, combined with the differences in flue gas particulate matter concentration, flue gas temperature and combustion air pressure at different moments corresponding to the same gas pressure; Flame color analysis module: used to determine the flame color health coefficient of the flame generated in the combustion chamber at each moment based on the difference between the flame color spectra in different photometric detection intervals in the combustion chamber at each moment, combined with the flue gas wind reflection requirement; Combustion-supporting air pressure control module: used to determine the combustion-supporting air pressure input by the burner at the current moment based on the distance from the flame nozzle to the highest temperature point of the heat exchanger in the combustion chamber at each moment and the temperature difference between the flame nozzle and the highest temperature point of the heat exchanger, combined with the flame color health coefficient of the flame generated in the combustion chamber.

[0007] Furthermore, the determination of the required flue gas wind response at each moment includes: Obtain the ratio of the concentration values ​​of carbon monoxide and nitrogen oxides in the flue gas at each moment, which is recorded as the flue gas carbon-nitrogen ratio at each moment; The first The carbon-nitrogen ratio of flue gas at the time The ratio of the carbon-nitrogen ratio of the flue gas at the time is recorded as The carbon-nitrogen ratio of flue gas tends to be high at the moment; In the Among all the moments before the moment, according to the The gas pressure at the same time is the same as that at the first time. The difference in the concentration of flue gas particulate matter, flue gas temperature and combustion air pressure at the time of The carbon-nitrogen ratio of the flue gas at the time is high, and the The flue gas wind speed at the time needs to reflect the degree.

[0008] Furthermore, the Among all the moments before the moment, according to the The gas pressure at the same time is the same as that at the first time. The difference in the concentration of flue gas particulate matter, flue gas temperature and combustion air pressure at the time of The carbon-nitrogen ratio of the flue gas at the time is high, and the The flue gas wind speed at the time needs to reflect the following: In the Among all the moments before the moment, get the The average of the flue gas particulate matter concentration values ​​at all times with the same gas pressure at the time, and then obtain the value of the average of the flue gas particulate matter concentration values ​​at the time The maximum flue gas temperature among all flue gas temperatures at the same time when the gas pressure is the same at the same time, and the combustion-supporting air pressure at the time corresponding to the maximum flue gas temperature is recorded as the target combustion-supporting air pressure; Get the The normalized value of the difference between the smoke particulate matter concentration value at the time and the mean value of the smoke particulate matter concentration value is the same as the normalized value of the difference between the smoke particulate matter concentration value at the time The product of the carbon-nitrogen ratio of the flue gas at the time is recorded as The oxygen deficiency index of flue gas mixture at the moment; Calculate the maximum flue gas temperature minus the The normalized value of the difference in flue gas temperature at the time is recorded as the first difference value, and the target combustion air pressure is calculated by subtracting the first difference value. The normalized value of the difference in the combustion-supporting air pressure at the moment is recorded as the second difference value, and the first difference value is combined with the second difference value and the first difference value. The product of the oxygen deficiency index of the flue gas mixture at the time is recorded as The flue gas wind speed at the time needs to reflect the degree.

[0009] Furthermore, determining the flame color health coefficient of the flame generated in the combustion chamber at each moment includes: In the The combustion chamber at the moment In the flame color spectrum of the photometric detection interval, the sum of the intensities corresponding to all wavelengths is obtained and recorded as the total spectrum value. The mean of the intensities corresponding to all wavelengths in the preset wavelength range is obtained as the blue light spectrum mean. The ratio of the blue light spectrum mean to the total spectrum value is recorded as the first The combustion chamber at the moment The proportion of blue light spectrum in each photometric detection interval; According to The combustion chamber at the moment The blue light spectrum ratio of the first photometric detection interval is The flue gas wind at the moment needs to reflect the degree of The combustion chamber at the moment Flame color abundance factor of each photometric detection interval; According to The difference in flame color abundance factor in different photometric detection intervals in the combustion chamber at the time is used to determine the The flame color health coefficient of the flame generated in the combustion chamber at the moment.

[0010] Furthermore, according to The combustion chamber at the moment The blue light spectrum ratio of the first photometric detection interval is The flue gas wind at the moment needs to reflect the degree of The combustion chamber at the moment The flame color richness factors for each photometric detection interval include: The first The combustion chamber at the moment The blue light spectrum ratio of the first photometric detection interval is The ratio of the flue gas wind to reflect the degree of the moment is recorded as The combustion chamber at the moment The flame color richness factor of the photometric detection interval.

[0011] Furthermore, according to The difference in flame color abundance factor in different photometric detection intervals in the combustion chamber at the time is used to determine the The flame health factor of the flame generated in the combustion chamber at the time includes: Get the The mean of the differences in the flame color abundance factors of all adjacent photometric detection intervals in the combustion chamber at the time is recorded as The flame color loss degree of the flame in the combustion chamber along the eruption direction at the time; Get the The average value of the flame color fullness factor of all the photometric detection intervals in the combustion chamber at the time is calculated, and the average value of the flame color fullness factor is added to the first The normalized value of the ratio of the flame color loss degree of the flame in the combustion chamber along the eruption direction at the time is recorded as The flame color health coefficient of the flame generated in the combustion chamber at the moment.

[0012] Furthermore, the determining of the combustion-supporting air pressure input by the burner at the current moment includes: Get the The inverse of the distance from the flame nozzle in the combustion chamber to the highest temperature point of the heat exchanger at the time is obtained. The absolute value of the temperature difference between the flame nozzle in the combustion chamber and the highest temperature point of the heat exchanger at the time The inverse normalized value of The product of the inverse proportional normalized values ​​of The thermal concentration of heat conduction at the moment; According to The thermal concentration of heat conduction at the moment The flame color health coefficient of the flame generated in the combustion chamber at the time is determined The combustion-supporting air pressure requirement of the burner at the moment; Record the current moment as moment, the first Moment and The absolute value of the difference in gas pressure at the time is recorded as the target difference value; According to the target difference value and The combustion air pressure requirement of the burner at the moment is determined The wind pressure control range of the combustion-supporting wind pressure at the moment; According to The wind pressure control range of the combustion air pressure at the moment is the same as that of the first The combustion air pressure at the moment is determined The combustion-supporting air pressure input by the burner at this moment.

[0013] Furthermore, according to The thermal concentration of heat conduction at the moment The flame color health coefficient of the flame generated in the combustion chamber at the time is determined The burner combustion air pressure requirements at the moment include: The first The thermal concentration of heat conduction at the moment The normalized value of the product of the flame color health coefficient of the flame generated in the combustion chamber at the time is recorded as The burner combustion air pressure requirement at the moment.

[0014] Further, the target difference value and the The combustion air pressure requirement of the burner at the moment is determined The wind pressure control range of the combustion-supporting wind pressure at the moment includes: When The gas pressure at the moment is greater than When the gas pressure at the moment The normalized value of the product of the burner combustion air pressure requirements at the time is recorded as The wind pressure control range of the combustion-supporting wind pressure at the moment; When The gas pressure at the moment is less than or equal to When the gas pressure is lowered, the target difference value is The negative value of the normalized value of the ratio of the combustion air pressure demand of the burner at the time is recorded as The wind pressure control range of the combustion-supporting wind pressure at the moment.

[0015] Furthermore, according to The wind pressure control range of the combustion air pressure at the moment is the same as that of the first The combustion air pressure at the moment is determined The combustion-supporting air pressure input by the burner at this moment includes: Get the preset constant and The sum of the wind pressure control amplitudes of the combustion-supporting wind pressure at the moment The product of the combustion-supporting air pressure at the time is recorded as The combustion-supporting air pressure input by the burner at this moment.

[0016] The beneficial effects of the technical solution of the present invention are: In an embodiment of the present invention, first, an oxygen deficiency index of the mixed gas is obtained based on the carbon and nitrogen content level of the flue gas generated by the burner and the flue gas particle size performance, and then the flue gas wind demand response is evaluated in combination with the flue gas temperature performance, and then the flame color abundance factor is obtained in combination with the spectral performance of the flame generated in the combustion chamber, and the flame color health coefficient is obtained in combination with the spectral performance of the multi-photometric detection area within the range of the generated flame, and then the combustion-supporting wind pressure demand is obtained in combination with the thermal concentration reflected by the heat exchanger, and the combustion-supporting wind pressure demand is negatively feedback-regulated by the combustion-supporting wind pressure demand. At this point, the present invention can adapt to a more suitable combustion-supporting wind pressure in combination with the flue gas generated in the combustion chamber and the flame performance in the actual gas burner scenario, thereby optimizing the burner air-fuel ratio and improving the accuracy of the intelligent air-gas linkage control of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a module flow chart of an intelligent air-gas linkage control system for a gas burner according to the present invention; Figure 2 This is the first gas burner structural diagram; Figure 3 This is the second gas burner structure diagram; Figure 4 This is a schematic diagram of the application of the burner attached to the coating drying furnace; Figure 5 Schematic diagram of the division of the photometric detection interval in the combustion chamber; Figure 6 Schematic diagram of the relationship between flue gas temperature and air-fuel ratio. DETAILED DESCRIPTION

[0019] To further illustrate the technical means and effectiveness of the present invention in achieving its intended objectives, the following, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed description of the specific implementation, structure, features, and effectiveness of an intelligent air-gas linkage control system for a gas burner according to the present invention. In the following description, references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0020] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0021] The specific scheme of the intelligent wind-gas linkage control system of the gas combustion engine provided by the present application is specifically described below in combination with the drawings.

[0022] Please refer to Figure 1 which shows the module flow chart of the intelligent wind-gas linkage control system of the gas combustion engine provided by an embodiment of the present application, the system comprising the following modules: Module 101: data acquisition module.

[0023] This module is used to acquire the gas pressure, combustion air pressure, flue gas temperature, flue gas particulate matter concentration value, concentration values of carbon monoxide and nitrogen oxides in the flue gas, and the flame color spectrum of each light detection interval in the combustion chamber, the distance from the flame spout in the combustion chamber to the highest temperature point of the heat exchanger, and the temperature values of the flame spout and the highest temperature point of the heat exchanger at each moment during the operation of the gas combustion engine.

[0024] It should be noted that the gas combustion engine mixes the input gas and air, ignites the mixed gas into a flame in the combustion chamber, thereby converting chemical energy into heat energy and transmitting it to the application end to achieve heat energy supply. The first gas combustion engine structure diagram is shown in Figure 2 , Figure 2 which comprises A (gas control valve group), B (premixed combustion engine head), C (wind and air linkage device), D (premixed ignition device), and E (combustion air valve device). The second gas combustion engine structure diagram is shown in Figure 3 , Figure 3The system comprises: F (gas pressure detection), G (gas turbine controller), H (combustion air pressure detection), I (light flame detection), J (gas proportional valve group), and K (combustion air filter). The combustion machine inputs the required amount of gas into the equipment interior according to the heat energy demand and the gas pressure applied by the gas control valve group, and then inputs the appropriate combustion air pressure in a fixed preset ratio with the gas pressure through the combustion air valve device, and then mixes the air supplied by the gas and combustion air pressure into mixed gas, and ignites the mixed gas by the premix ignition device to generate a flame that can provide heat, and then the combustion machine is installed in the curing oven, drying oven, and other application ends with heat demand in the coating, electroplating, and other industries. The application schematic diagram of the combustion machine attached to the coating drying oven is shown in Figure 4 Figure 4 The system comprises: a burner, a combustion air filtration device, return air, air supply, and burning flames. The traditional method of adjusting the combustion air pressure according to the fixed ratio between the gas pressure and the combustion air pressure has low adaptability to the combustion scene of the combustion machine, so in this embodiment, the actual scene is combined to generate flue gas and flame to adaptively adjust the combustion air pressure, so as to optimize the air-fuel ratio and improve the accuracy of intelligent air-gas linkage control of the combustion machine.

[0025] At each moment during the operation of the gas combustion machine, the gas pressure, combustion air pressure, flue gas temperature, flue gas particulate matter concentration value, concentration values of carbon monoxide and nitrogen oxides in the flue gas, and the flame color spectrum of each light detection interval in the combustion chamber, the distance from the flame jet of the combustion chamber to the highest temperature point of the heat exchanger, and the temperature values of the flame jet and the highest temperature point of the heat exchanger are obtained. Among them, the horizontal and vertical of the flame color spectrum are wavelength, and the vertical axis is intensity.

[0026] ​It is required to be explained: in this embodiment, the operation data of the gas combustion machine in the past two months is collected, and the collection frequency is once per second. The gas pressure data input in the gas machine is read through the data storage module. It should be noted that the gas pressure is determined in advance according to the heat demand in the application task, so the gas pressure can be directly read. The concentration data of carbon monoxide and nitrogen oxides in the generated flue gas is read through the carbon and nitrogen oxides monitor at the flue gas outlet. The flue gas particle concentration data in the generated flue gas is read through the CEMS particulate matter monitoring unit at the flue gas outlet. The temperature distribution data of the flue gas temperature and the heat exchanger in the combustion chamber is read through the temperature monitoring module. The atomic emission spectrum data of each flame range corresponding to the luminosity detection interval in the combustion chamber is read through the flame color spectrum acquisition module. It should be noted that the range of the luminosity detection interval is determined by the accuracy of the light sensing flame detection module, so the number of luminosity detection intervals is affected by the accuracy of the flame detection module. Finally, the read data is uploaded to the wind-gas linkage device for subsequent analysis and use.

[0027] It is further required to be explained: the division diagram of the luminosity detection interval in the combustion chamber is as shown in Figure 5 In the combustion chamber, along the direction of the combustion flame emitted by the gas combustion machine on the left side of the combustion chamber, the combustion chamber is equally divided into several luminosity detection intervals, the flame color spectrum of a single luminosity detection interval is obtained using the flame color spectrum acquisition module above the combustion chamber, thereby obtaining the flame color spectrum of multiple luminosity detection intervals, the heat exchanger is located on the right side of the combustion chamber, and the flame injection port in the combustion chamber is Figure 5 The black solid point. The temperature of the flame injection port in the combustion chamber and the temperature at different positions of the heat exchanger are read through the temperature monitoring module, and the point with the highest temperature on the heat exchanger is selected, thereby obtaining the distance from the flame injection port to the highest temperature point of the heat exchanger and the temperature value of the flame injection port and the highest temperature point of the heat exchanger.

[0028] Module 102: flue gas wind analysis module.

[0029] This module is used to determine the flue gas wind reflection degree at each moment according to the concentration value difference of carbon monoxide and nitrogen oxides in the flue gas at the same moment, combined with the concentration value difference of flue gas particles at different moments corresponding to the same gas pressure, the temperature difference of flue gas, and the combustion-supporting wind pressure difference.

[0030] It is required to be explained: the purpose of the embodiment is to optimize the air-fuel ratio by regulating the combustion air pressure, so first of all, the smoke air reflection degree is evaluated according to the smoke performance generated by the chemical reaction of the combustion machine, and the combustion air pressure demand degree is obtained by cooperating with the heating performance of the flame generated in the combustion chamber based on the smoke air reflection degree, and then the combustion air pressure of the combustion machine is negatively fed back and regulated through the combustion air pressure demand degree. Combustion air and gas generate mixed gas in the combustion chamber, and a large amount of smoke is generated in the combustion process. The change of the air-fuel ratio will have a related influence on the concentration of carbon, nitrogen oxides, smoke particle size and temperature of the generated smoke after the reaction, so the smoke air reflection degree is evaluated according to the smoke performance. The combustion air pressure of the combustion machine in the first 3 seconds of the initial operation is selected as the traditional preset fixed proportion adjustment mode, and the combustion air pressure of the combustion machine at each moment is adaptively obtained by using the following mode.

[0031] Preferably, in an embodiment of the present application, the method for obtaining the smoke air reflection degree at each moment comprises: Obtain the ratio of the concentration values of carbon monoxide and nitrogen oxides in the smoke at each moment, denoted as the smoke carbon-nitrogen ratio at each moment.

[0032] The ratio of the smoke carbon-nitrogen ratio at the first moment to the smoke carbon-nitrogen ratio at the first moment is denoted as the smoke carbon-nitrogen ratio trend height at the first moment.

[0033] It is required to be explained: when the combustion air pressure is relatively high relative to the gas pressure, the air-fuel ratio is high, at this time, the excessive oxygen reacts with nitrogen to generate a large amount of nitride in the smoke, on the contrary, when the air-fuel ratio is low, the combustion reaction is insufficient, at this time, the emission of carbon monoxide in the smoke increases significantly. If the carbon-nitrogen ratio in the smoke at each moment is more and more increasing compared with the last moment, it means that the performance of the air-fuel ratio of the combustion machine is lower. When the air-fuel ratio performance is low, the air content input into the combustion chamber is relatively small, and the heavy components of the gas are not completely burned in the oxygen-deficient environment, and are thermally decomposed into solid carbon particles, resulting in a strong performance of the particulate matter concentration in the smoke. When the particulate matter concentration in the generated smoke at each moment is strong, and the smoke carbon-nitrogen ratio trend height is large at the same moment, it can further effectively indicate that the possibility of the mixed gas in the combustion machine being in an oxygen-deficient state is higher.

[0034] Before the first moment, the average value of the smoke particulate matter concentration values at all moments with the same gas pressure as the first moment is obtained, and then the normalized value of the difference between the smoke particulate matter concentration value at the first moment and the average value is obtained, and the normalized value of the difference is compared with the first The product of the carbon-nitrogen ratio of the flue gas at the time is recorded as The oxygen deficiency index of flue gas mixture at the moment.

[0035] It should be noted that: In this embodiment, The linear normalization function normalizes the difference to between 0 and 1. When the combustion-supporting air pressure is too high, that is, the air-fuel ratio is too high, the excess cold air in the combustion chamber absorbs the combustion heat, causing the flue gas temperature to drop, and the heat conversion efficiency to drop. When the combustion-supporting air pressure is too low, that is, the air-fuel ratio is too low, the combustion is incomplete, and the oxygen-deficient environment causes incomplete combustion of the gas, which also causes the flue gas temperature to drop, and the heat conversion efficiency to drop. Therefore, when the combustion-supporting air pressure tends to be more adaptable, the flue gas should show a higher temperature effect. Therefore, based on the mixed gas hypoxia index and the flue gas temperature performance, the real-time flue gas wind response needs to be evaluated. The relationship diagram of flue gas temperature and air-fuel ratio is shown as follows. Figure 6 As shown, Figure 6 The horizontal axis is the air-fuel ratio, and the vertical axis is the flue gas temperature. When the air-fuel ratio is too low or too high, the flue gas temperature is low. When the air-fuel ratio is moderate, that is, at the dotted line, the flue gas temperature is high.

[0036] In the Among all the moments before the moment, get the The maximum flue gas temperature among all flue gas temperatures at the same time when the gas pressure at the time is the same, and the combustion-supporting air pressure at the time corresponding to the maximum flue gas temperature is recorded as the target combustion-supporting air pressure.

[0037] Calculate the maximum flue gas temperature minus the The normalized value of the difference in flue gas temperature at the time is recorded as the first difference value, and the target combustion air pressure is calculated by subtracting the first difference value. The normalized value of the difference in the combustion-supporting air pressure at the moment is recorded as the second difference value, and the first difference value is combined with the second difference value and the first difference value. The product of the oxygen deficiency index of the flue gas mixture at the time is recorded as The flue gas wind speed at the time needs to reflect the degree.

[0038] It should be noted that: In this embodiment, The linear normalization function normalizes the flue gas temperature difference and the combustion-supporting air pressure difference to a value between 0 and 1. The target combustion-supporting air pressure is the combustion-supporting air pressure corresponding to the historical peak flue gas temperature (maximum flue gas temperature) under the same gas pressure. If the combustion-supporting air pressure corresponding to the historical peak flue gas temperature under the same gas pressure is greater than the combustion-supporting air pressure at each moment, and if the historical peak flue gas temperature under the same gas pressure is higher than the flue gas temperature at each moment, then the necessity of increasing the combustion-supporting air pressure at each moment, as reflected by the flue gas temperature, is greater. Furthermore, if the mixed gas oxygen deficiency index is greater, then the need for flue gas wind pressure to be reflected at each moment is greater.

[0039] Module 103: Flame color analysis module.

[0040] This module is used to determine the flame color health coefficient of the flame generated in the combustion chamber at each moment based on the difference between the flame color spectra in different photometric detection intervals in the combustion chamber at each moment, combined with the flue gas wind reflection requirement.

[0041] It should be noted that a combustion-supporting air pressure that is highly compatible with the gas pressure can catalyze a relatively complete combustion reaction within the combustion chamber, resulting in a strong, healthy flame color and improved heat exchange efficiency. Therefore, in this embodiment, the combustion flame presentation effect in the combustion chamber is evaluated, and the flue gas air response requirement is matched in conjunction with the flame performance to obtain the combustion-supporting air pressure requirement at the time of analysis. Because the flame generated by the burner is present within the combustion chamber, and a flame color spectrum detection module is located above the combustion chamber, emission spectrum data of the flame color within the corresponding photometric detection intervals of different flame ranges in the combustion chamber can be obtained. When the combustion-supporting air pressure is highly compatible with the gas pressure, the combustion reaction is relatively complete, resulting in a blue flame color within the combustion chamber. Since blue light primarily resides in the luminescence band of 400 to 460 nanometers, the spectral value of the blue light band in the flame color emission spectrum collected within a single photometric detection interval within the combustion chamber at a single moment is extracted to represent the combustion effect.

[0042] Preferably, in one embodiment of the present invention, the method for obtaining the flame color health coefficient of the flame generated in the combustion chamber at each moment includes: The preset wavelength range is [400, 460] nanometers, which is used as an example for description.

[0043] In the The combustion chamber at the moment In the flame color spectrum of the photometric detection interval, the sum of the intensities corresponding to all wavelengths is obtained and recorded as the total spectrum value. The mean of the intensities corresponding to all wavelengths in the preset wavelength range is obtained as the blue light spectrum mean. The ratio of the blue light spectrum mean to the total spectrum value is recorded as the first The combustion chamber at the moment The proportion of blue light spectrum in each photometric detection interval.

[0044] The first The combustion chamber at the moment The blue light spectrum ratio of the first photometric detection interval is The ratio of the flue gas wind to reflect the degree of the moment is recorded as The combustion chamber at the moment The flame color richness factor of the photometric detection interval.

[0045] What needs to be explained is: The combustion chamber at the moment The larger the proportion of blue light spectrum in the first photometric detection interval, the greater the possibility of complete combustion. The smaller the flue gas wind response of the burner at this moment, the more abundant the flame color performance is.

[0046] Get the The mean of the differences in the flame color abundance factors of all adjacent photometric detection intervals in the combustion chamber at the time is recorded as The flame color loss degree of the flame in the combustion chamber along the eruption direction at the time.

[0047] It should be noted that: in this embodiment, according to the direction of flame eruption in the combustion chamber, Figure 5 From left to right in the figure, the difference between the flame color abundance factor of the first photometric detection interval and the flame color abundance factor of the second photometric detection interval is calculated, thereby obtaining the average of the differences in the flame color abundance factors of all adjacent photometric detection intervals. When the combustion-supporting air pressure is too low, the proportion of gas in the mixed gas is high, and the resulting flame is more vigorous, resulting in less loss of blue light flame color during complete combustion along the direction of flame eruption. When the combustion-supporting air pressure is too high, the proportion of air is high, and the resulting flame is weak and turbulent, resulting in greater loss of blue light flame color during complete combustion along the direction of flame eruption. If the flame color abundance factor corresponding to the photometric detection interval at the far end of the flame eruption direction is smaller than that at the near end, it means that the flame color loss is greater.

[0048] Get the The average value of the flame color richness factor of all the photometric detection intervals in the combustion chamber at the time is obtained, and the average value of the flame color richness factor is compared with the value of the first The normalized value of the ratio of the flame color loss degree of the flame in the combustion chamber along the eruption direction at the time is recorded as The flame color health coefficient of the flame generated in the combustion chamber at the moment.

[0049] It should be noted that: In this embodiment, The linear normalization function normalizes the ratio to between 0 and 1. If the flame color richness factor level of all photometric detection intervals at each moment is higher and the flame color loss in the flame eruption direction is smaller, it means that the flame color is stronger and the flame color of the flame generated in the combustion chamber is healthier.

[0050] Module 104: Combustion-supporting air pressure control module.

[0051] This module is used to determine the combustion-supporting air pressure input to the burner at the current moment based on the distance from the flame nozzle to the highest temperature point of the heat exchanger in the combustion chamber at each moment and the temperature difference between the flame nozzle and the highest temperature point of the heat exchanger, combined with the flame color health coefficient of the flame generated in the combustion chamber.

[0052] What needs to be explained is: further, it is necessary to verify the flame color health coefficient through the temperature distribution of the heat exchanger in front of the flame in the combustion chamber. When the flame performance is strong and stable, the heat conduction direction of the generated heat is less likely to deviate. If the highest temperature point on the heat exchanger surface is closer to the flame nozzle, that is, the flame injection direction is straight, and the temperature difference between the flame nozzle temperature and the highest temperature of the heat exchanger surface is smaller, it means that the heat conduction direction of the flame is more stable and concentrated.

[0053] Preferably, in one embodiment of the present invention, the method for obtaining the combustion-supporting air pressure input by the burner at the current moment includes: Get the The inverse of the distance from the flame nozzle in the combustion chamber to the highest temperature point of the heat exchanger at the time is obtained. The absolute value of the temperature difference between the flame nozzle in the combustion chamber and the highest temperature point of the heat exchanger at the time The inverse normalized value of The product of the inverse proportional normalized values ​​of The thermal concentration of heat conduction at the moment.

[0054] Among them, As The inversely proportional normalized value of .

[0055] The first The thermal concentration of heat conduction at the moment The normalized value of the product of the flame color health coefficient of the flame generated in the combustion chamber at the time is recorded as The burner combustion air pressure requirement at the moment.

[0056] It should be noted that: In this embodiment, The linear normalization function normalizes the product of the flame health coefficient to a value between 0 and 1. A higher flame health coefficient and a higher heat concentration in the flame heat conduction at each moment indicate a relatively high proportion of fuel gas in the mixed gas at each moment. In this case, the combustion air pressure can be appropriately increased.

[0057] According to the above method, the combustion-supporting air pressure requirement of the burner at each moment can be obtained.

[0058] Record the current moment as moment, the first Moment and The absolute value of the difference in gas pressure at the time is recorded as the target difference value.

[0059] When The gas pressure at the moment is greater than the product of the target difference value and the combustion-supporting air pressure demand degree at the first time point is normalized, and the normalized value is recorded as the first time point air pressure control range of the combustion-supporting air pressure. the product of the target difference value and the combustion-supporting air pressure demand degree at the first time point is normalized, and the normalized value is recorded as the first time point air pressure control range of the combustion-supporting air pressure.

[0060] When the gas pressure at the first time point is less than or equal to the gas pressure at the second time point, the negative value of the normalized value of the ratio of the target difference value to the combustion-supporting air pressure demand degree at the first time point is recorded as the first time point air pressure control range of the combustion-supporting air pressure. When the gas pressure at the first time point is less than or equal to the gas pressure at the second time point, the negative value of the normalized value of the ratio of the target difference value to the combustion-supporting air pressure demand degree at the first time point is recorded as the first time point air pressure control range of the combustion-supporting air pressure. the product of the target difference value and the combustion-supporting air pressure demand degree at the first time point is normalized, and the normalized value is recorded as the first time point air pressure control range of the combustion-supporting air pressure. the product of the target difference value and the combustion-supporting air pressure demand degree at the first time point is normalized, and the normalized value is recorded as the first time point air pressure control range of the combustion-supporting air pressure.

[0061] In this embodiment, the linear normalization function is used to normalize the product of the combustion-supporting air pressure demand degree and the ratio of the combustion-supporting air pressure demand degree to 0 to 1. The preset constant is 1, which is used as an example for description.

[0062] The sum of the preset constant and the air pressure control range of the combustion-supporting air pressure at the first time point is recorded as the product of the target difference value and the combustion-supporting air pressure at the first time point.

[0063] the product of the target difference value and the combustion-supporting air pressure demand degree at the first time point is normalized, and the normalized value is recorded as the first time point air pressure control range of the combustion-supporting air pressure.

[0064] It should be noted that the gas pressure is the main influencing index of the combustion-supporting air pressure control, and the changes of the two are approximately proportional, so the real-time combustion-supporting air pressure control direction is determined by the real-time and the previous time gas pressure. If the current gas pressure is greater than the previous time, the combustion-supporting air pressure is increased, and the higher the combustion-supporting air pressure demand degree of the previous time, the more the real-time combustion-supporting air pressure needs to be adjusted. If the current gas pressure is less than or equal to the previous time, the combustion-supporting air pressure is reduced, and the higher the combustion-supporting air pressure demand degree of the previous time, the less the real-time combustion-supporting air pressure needs to be adjusted.

[0065] ​​​​​It should be further explained that the complete process of the intelligent air-gas linkage control of the perfect gas burner is as follows: (1) For execution tasks with low requirements for coating drying accuracy, the burner executes the entire drying process based on the above-mentioned real-time combustion-supporting air pressure. (2) For execution tasks with high requirements for coating drying accuracy, the burner executes the drying process based on the above-mentioned real-time combustion-supporting air pressure. After 10 seconds of executing the drying process, it enters the air pressure control amplitude fine-tuning stage. (3) In the air pressure amplitude fine-tuning stage, the combustion-supporting air pressure demand at the current two moments is obtained. (4) In the case where the gas pressure at the current moment is large, that is, the combustion-supporting air pressure needs to be increased, if the combustion-supporting air pressure demand at the current moment obtained by the adaptive combustion-supporting air pressure is higher than the combustion-supporting air pressure at the previous moment, it means that the adaptive combustion-supporting air pressure amplitude level is lower than the ideal amplitude, and the real-time adaptive combustion-supporting air pressure amplitude level is increased by a preset 8%. Otherwise, it is considered that the adaptive combustion-supporting air pressure effect is excellent and the amplitude fine-tuning process is not performed. (5) When the gas pressure at the current moment is low, that is, when the combustion-supporting air pressure needs to be lowered, if the combustion-supporting air pressure requirement at the current moment obtained by the adaptive combustion-supporting air pressure is lower than the combustion-supporting air pressure at the previous moment, it means that the adaptive combustion-supporting air pressure amplitude level is lower than the ideal amplitude, and the real-time adaptive combustion-supporting air pressure amplitude level is increased by a preset 8%. Otherwise, it is considered that the adaptive combustion-supporting air pressure effect is excellent and no amplitude fine-tuning is performed. In this way, all drying execution tasks are completed by the burner with adaptive combustion-supporting air pressure, thereby optimizing the air-fuel ratio in the combustion process and realizing a gas burner with a higher adaptability to task requirements. In this embodiment, when calculating the ratio, if the denominator is 0, the denominator is set to 1 to ensure that the calculation of the ratio is established. This example is used for description.

[0066] So far, the present invention is completed.

[0067] In summary, in an embodiment of the present invention, based on the difference in the concentration values ​​of carbon monoxide and nitrogen oxides in the flue gas at the same moment, combined with the difference in the concentration values ​​of flue gas particulate matter, flue gas temperature, and combustion-supporting air pressure at different moments corresponding to the same gas pressure, the flue gas wind reflection requirement at each moment is determined. Then, combined with the difference between the flame color spectra in different photometric detection intervals in the combustion chamber at each moment, the flame color health coefficient of the flame generated in the combustion chamber at each moment is determined. Then, combined with the distance from the flame nozzle to the highest temperature point of the heat exchanger in the combustion chamber at each moment and the temperature difference between the flame nozzle and the highest temperature point of the heat exchanger at each moment, the combustion-supporting air pressure input to the burner at the current moment is determined. The present invention optimizes the intelligent air and gas control effect of the burner by adaptively regulating the combustion-supporting air pressure in combination with flue gas and flame performance.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An intelligent air-gas linkage control system for a gas burner, characterized in that: The system includes the following modules: Data acquisition module: used to obtain gas pressure, combustion air pressure, flue gas temperature, flue gas particulate matter concentration, carbon monoxide and nitrogen oxide concentrations in the flue gas, as well as the flame color spectrum of each photometric detection interval in the combustion chamber, the distance from the flame nozzle to the highest temperature point of the heat exchanger in the combustion chamber, and the temperature values ​​of the flame nozzle and the highest temperature point of the heat exchanger at every moment during the operation of the gas burner; Flue gas air demand analysis module: used to determine the flue gas air demand at each moment based on the concentration differences of carbon monoxide and nitrogen oxides in the flue gas at the same moment, combined with the differences in flue gas particulate matter concentration, flue gas temperature and combustion air pressure at different moments corresponding to the same gas pressure; Flame color analysis module: used to determine the flame color health coefficient of the flame generated in the combustion chamber at each moment based on the difference between the flame color spectra in different photometric detection intervals in the combustion chamber at each moment, combined with the flue gas wind reflection requirement; Combustion-supporting air pressure control module: used to determine the combustion-supporting air pressure input by the burner at the current moment based on the distance from the flame nozzle to the highest temperature point of the heat exchanger in the combustion chamber at each moment and the temperature difference between the flame nozzle and the highest temperature point of the heat exchanger, combined with the flame color health coefficient of the flame generated in the combustion chamber.

2. The intelligent air-gas linkage control system for a gas burner according to claim 1, characterized in that: Determining the flue gas wind response required at each moment includes: Obtain the ratio of the concentration values ​​of carbon monoxide and nitrogen oxides in the flue gas at each moment, which is recorded as the flue gas carbon-nitrogen ratio at each moment; The first The carbon-nitrogen ratio of flue gas at the time The ratio of the carbon-nitrogen ratio of the flue gas at the time is recorded as The carbon-nitrogen ratio of flue gas tends to be high at the moment; In the Among all the moments before the moment, according to the The gas pressure at the same time is the same as that at the first time. The difference in the concentration of flue gas particulate matter, flue gas temperature and combustion air pressure at the time of The carbon-nitrogen ratio of the flue gas at the time is high, and the The flue gas wind speed at the moment needs to reflect the degree.

3. The intelligent air-gas linkage control system for a gas burner according to claim 2, characterized in that: As stated in Among all the moments before the moment, according to the The gas pressure at the same time is the same as that at the first time. The difference in the concentration of flue gas particulate matter, flue gas temperature and combustion air pressure at the time of The carbon-nitrogen ratio of the flue gas at the time is high, and the The flue gas wind speed at the time needs to reflect the following: In the Among all the moments before the moment, get the The average of the flue gas particulate matter concentration values ​​at all times with the same gas pressure at the time, and then obtain the value of the average of the flue gas particulate matter concentration values ​​at the time The maximum flue gas temperature among all flue gas temperatures at the same time when the gas pressure is the same at the same time, and the combustion-supporting air pressure at the time corresponding to the maximum flue gas temperature is recorded as the target combustion-supporting air pressure; Get the The normalized value of the difference between the smoke particulate matter concentration value at the time and the mean value of the smoke particulate matter concentration value is the same as the normalized value of the difference between the smoke particulate matter concentration value at the time The product of the carbon-nitrogen ratio of the flue gas at the time is recorded as The oxygen deficiency index of flue gas mixture at the moment; Calculate the maximum flue gas temperature minus the The normalized value of the difference in flue gas temperature at the time is recorded as the first difference value, and the target combustion air pressure is calculated by subtracting the first difference value. The normalized value of the difference in the combustion-supporting air pressure at the moment is recorded as the second difference value, and the first difference value is combined with the second difference value and the first difference value. The product of the oxygen deficiency index of the flue gas mixture at the time is recorded as The flue gas wind speed at the moment needs to reflect the degree.

4. The intelligent air-gas linkage control system for a gas burner according to claim 1, characterized in that: Determining the flame color health coefficient of the flame generated in the combustion chamber at each moment includes: In the The combustion chamber at the moment In the flame color spectrum of the photometric detection interval, the sum of the intensities corresponding to all wavelengths is obtained and recorded as the total spectrum value. The mean of the intensities corresponding to all wavelengths in the preset wavelength range is obtained as the blue light spectrum mean. The ratio of the blue light spectrum mean to the total spectrum value is recorded as the first The combustion chamber at the moment The proportion of blue light spectrum in each photometric detection interval; According to The combustion chamber at the moment The blue light spectrum ratio of the first photometric detection interval is The flue gas wind at the moment needs to reflect the degree of The combustion chamber at the moment Flame color abundance factor of each photometric detection interval; According to The difference in flame color abundance factor in different photometric detection intervals in the combustion chamber at the time is used to determine the The flame color health coefficient of the flame generated in the combustion chamber at the moment.

5. The intelligent air-gas linkage control system for a gas burner according to claim 4, characterized in that: According to the The combustion chamber at the moment The blue light spectrum ratio of the first photometric detection interval is The flue gas wind at the moment needs to reflect the degree of The combustion chamber at the moment The flame color richness factors for each photometric detection interval include: The first The combustion chamber at the moment The blue light spectrum ratio of the first photometric detection interval is The ratio of the flue gas wind to reflect the degree of the moment is recorded as The combustion chamber at the moment The flame color richness factor of the photometric detection interval.

6. The intelligent air-gas linkage control system for a gas burner according to claim 4, characterized in that: According to the The difference in flame color abundance factor in different photometric detection intervals in the combustion chamber at the time is used to determine the The flame health factor of the flame generated in the combustion chamber at the time includes: Get the The mean of the differences in the flame color abundance factors of all adjacent photometric detection intervals in the combustion chamber at the time is recorded as The flame color loss degree of the flame in the combustion chamber along the eruption direction at the time; Get the The average value of the flame color fullness factor of all the photometric detection intervals in the combustion chamber at the time is calculated, and the average value of the flame color fullness factor is added to the first The normalized value of the ratio of the flame color loss degree of the flame in the combustion chamber along the eruption direction at the time is recorded as The flame color health coefficient of the flame generated in the combustion chamber at the moment.

7. The intelligent air-gas linkage control system for a gas burner according to claim 1, characterized in that: Determining the combustion-supporting air pressure input by the burner at the current moment includes: Get the The inverse of the distance from the flame nozzle in the combustion chamber to the highest temperature point of the heat exchanger at the time is obtained. The absolute value of the temperature difference between the flame nozzle in the combustion chamber and the highest temperature point of the heat exchanger at the time The inverse normalized value of The product of the inverse proportional normalized values ​​of The thermal concentration of heat conduction at the moment; According to The thermal concentration of heat conduction at the moment The flame color health coefficient of the flame generated in the combustion chamber at the time is determined The combustion-supporting air pressure requirement of the burner at the moment; Record the current moment as moment, the first Moment and The absolute value of the difference in gas pressure at the time is recorded as the target difference value; According to the target difference value and The combustion air pressure requirement of the burner at the moment is determined The wind pressure control range of the combustion-supporting wind pressure at the moment; According to The wind pressure control range of the combustion air pressure at the moment is the same as that of the first The combustion air pressure at the moment is determined The combustion-supporting air pressure input by the burner at this moment.

8. The intelligent air-gas linkage control system for a gas burner according to claim 7, characterized in that: According to the The thermal concentration of heat conduction at the moment The flame color health coefficient of the flame generated in the combustion chamber at the time is determined The burner combustion air pressure requirements at the moment include: The first The thermal concentration of heat conduction at the moment The normalized value of the product of the flame color health coefficient of the flame generated in the combustion chamber at the time is recorded as The burner combustion air pressure requirement at the moment.

9. The intelligent air-gas linkage control system for a gas burner according to claim 7, characterized in that: The target difference value and the The combustion air pressure requirement of the burner at the moment is determined The wind pressure control range of the combustion-supporting wind pressure at the moment includes: When The gas pressure at the moment is greater than When the gas pressure at the moment The normalized value of the product of the burner combustion air pressure requirements at the time is recorded as The wind pressure control range of the combustion-supporting wind pressure at the moment; When The gas pressure at the moment is less than or equal to When the gas pressure is lowered, the target difference value is The negative value of the normalized value of the ratio of the burner combustion air pressure demand at the moment is recorded as The wind pressure control range of the combustion-supporting wind pressure at the moment.

10. The intelligent air-gas linkage control system for a gas burner according to claim 7, characterized in that: According to the The wind pressure control range of the combustion air pressure at the moment is the same as that of the first The combustion air pressure at the moment is determined The combustion-supporting air pressure input by the burner at this moment includes: Get the preset constant and The sum of the wind pressure control amplitudes of the combustion-supporting wind pressure at the moment The product of the combustion-supporting air pressure at the time is recorded as The combustion-supporting air pressure input by the burner at this moment.

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