Intelligent air-gas linkage control system of gas combustion machine

Abstract

The present application relates to the technical field of combustor, in particular to an intelligent air-gas linkage control system of gas combustor, which determines the smoke air reflection degree at each moment according to the concentration value difference of carbon monoxide and nitrogen oxides in the smoke at the same moment, combines the concentration value difference of smoke particulate matter, the temperature difference of smoke and the pressure difference of combustion air at different moments corresponding to the same gas pressure, determines the flame color health coefficient of the generated flame in the combustion chamber at each moment according to the difference between the flame color spectrum of different light detection intervals in the combustion chamber at each moment, and determines the combustion air pressure input by the combustor at the current moment according to the distance from the flame jet to the highest temperature point of the heat exchanger in the combustion chamber at each moment and the temperature value difference between the flame jet and the highest temperature point of the heat exchanger. The present application adjusts and controls the combustion air pressure by combining the smoke and the flame performance to optimize the intelligent air-gas control effect of the combustor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of burners, in particular to an intelligent air-gas linkage control system of a gas combustion machine. BACKGROUND

[0002] The gas combustion machine is an industrial heat energy equipment that uses gas as fuel and realizes efficient combustion by premixing air. Its core function is to ignite the mixed gas and air in proportion and stably output heat energy to the application end equipment. It is widely used in industries such as coating and electroplating, and is widely used in curing ovens, drying ovens and other equipment ends.

[0003] Gas pressure and combustion air pressure are two core inputs of the combustion machine. The gas pressure needs to be supplied according to the scene requirements, and the combustion air pressure determines the combustion sufficiency of the input gas. In the traditional combustion air pressure control, the gas pressure and the combustion air pressure are supplied according to the preset fixed ratio between the gas pressure and the combustion air pressure, and then the air-gas linkage control is realized.

[0004] The existing problem: the fluctuation of the gas pipe network pressure in the actual scene will affect the increase and decrease of the gas amount injected into the equipment, and then cause the deviation between the input gas pressure and the actual gas pressure. At this time, if the air pressure is controlled according to the fixed ratio between the gas pressure and the combustion air pressure, the adaptation performance of the combustion air pressure and the gas pressure will be reduced, which will affect the smoke and flame generated by the combustion machine, and then reduce the heat supply efficiency. SUMMARY

[0005] The present application provides an intelligent air-gas linkage control system of a gas combustion machine to solve the existing problems.

[0006] The intelligent air-gas linkage control system of the gas combustion machine of the present application adopts the following technical scheme:

[0007] An embodiment of the present application provides an intelligent air-gas linkage control system of a gas combustion machine, which comprises the following modules:

[0008] Data acquisition module: used for acquiring the gas pressure, combustion air pressure, smoke temperature, smoke particulate matter concentration value, carbon monoxide and nitrogen oxide concentration values in the smoke, and flame color spectrum of each light detection interval in the combustion chamber, the distance from the flame jet to the highest temperature point of the heat exchanger in the combustion chamber, and the temperature values of the flame jet and the highest temperature point of the heat exchanger at each moment during the operation of the gas combustion machine;

[0009] Smoke air demand analysis module: used for determining the smoke air demand degree at each moment according to the concentration value difference of carbon monoxide and nitrogen oxides in the smoke at the same moment, combining the concentration value difference of smoke particulate matter at different moments, the temperature difference of the smoke, and the combustion air pressure difference corresponding to the same gas pressure;

[0010] Flame color analysis module: used to determine the flame color health coefficient of the generated flame 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 air demand reflectance.

[0011] Combustion air pressure control module: It is used to determine the combustion 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, the temperature difference between the flame nozzle and the highest temperature point of the heat exchanger, and the flame color health coefficient of the generated flame in the combustion chamber.

[0012] Furthermore, determining the flue gas demand response at each moment includes:

[0013] The ratio of the concentrations of carbon monoxide and nitrogen oxides in the flue gas at each time point is recorded as the carbon-nitrogen ratio of the flue gas at each time point.

[0014] The first The carbon-to-nitrogen ratio of flue gas at time t and the first The ratio of carbon to nitrogen in the flue gas at time t is denoted as the i-th time. The carbon-to-nitrogen ratio of the flue gas tends to be high at any given time.

[0015] In the In all moments before moment , according to the time of , All times with the same gas pressure at time t and the first Differences in particulate matter concentration, flue gas temperature, and combustion air pressure at any given time, combined with the first The carbon-to-nitrogen ratio of the flue gas at a given time tends to be high, determining the first The current flue gas wind needs to reflect the degree of responsiveness.

[0016] Furthermore, the aforementioned in the first In all moments before moment , according to the time of , All times with the same gas pressure at time t and the first Differences in particulate matter concentration, flue gas temperature, and combustion air pressure at any given time, combined with the first The carbon-to-nitrogen ratio of the flue gas at a given time tends to be high, determining the first The current flue gas air demand response includes:

[0017] In the In all moments before moment 1, obtain the information related to the first moment. The average of the particulate matter concentration values ​​of flue gas at all times with the same gas pressure at time t is then obtained, and compared with the value at time t. The maximum flue gas temperature among all flue gas temperatures at the same time under the same gas pressure is recorded as the target combustion air pressure.

[0018] Get the The normalized value of the difference between the particulate matter concentration at time t and the mean of the particulate matter concentration at time t is compared with the value at time t. The product of the carbon-to-nitrogen ratio of the flue gas at time t is denoted as the product of the heights at time t. The oxygen deficiency index of the flue gas mixture at that time;

[0019] Calculate the maximum flue gas temperature minus the first The normalized value of the difference in flue gas temperature at time t is denoted as the first difference value. The target combustion air pressure is calculated by subtracting the first difference value from the second difference value. The normalized value of the difference in combustion air pressure at time t is denoted as the second difference value. The first difference value, the second difference value, and the third difference value are then compared. The product of the oxygen deficiency index of the flue gas mixture at time t is denoted as the i-th time. The current flue gas wind needs to reflect the degree of responsiveness.

[0020] Furthermore, determining the flame color health coefficient of the generated flame in the combustion chamber at each moment includes:

[0021] In the In the combustion chamber at the moment In the flame color spectrum of each photometric detection interval, the sum of the intensities corresponding to all wavelengths is obtained and recorded as the total spectral value. The mean of the intensities corresponding to all wavelengths within the preset wavelength range is obtained and recorded as the mean of the blue light spectrum. The ratio of the mean of the blue light spectrum to the total spectral value is recorded as the i-th value. In the combustion chamber at the moment The percentage of blue light spectrum in each photometric detection range;

[0022] According to the In the combustion chamber at the moment The proportion of blue light spectrum in each photometric detection interval and the first The flue gas wind demand response degree at the current moment is determined to be the first In the combustion chamber at the moment Flame color abundance factor in each photometric detection range;

[0023] According to the The difference in flame abundance factor in different photometric detection ranges in the combustion chamber at a given time was used to determine the first... The flame color health coefficient of the flame generated in the combustion chamber at any given time.

[0024] Furthermore, the statement based on the first In the combustion chamber at the moment The proportion of blue light spectrum in each photometric detection interval and the first The flue gas wind demand response degree at the current moment is determined to be the first In the combustion chamber at the moment The flame color fullness factor of the i-th luminosity detection interval in the combustion chamber at the t-th moment includes:

[0025] The blue light spectrum proportion value of the i-th luminosity detection interval in the combustion chamber at the t-th moment is multiplied by the smoke wind reflection degree ratio at the t-th moment, and the product is recorded as the flame color fullness factor of the i-th luminosity detection interval in the combustion chamber at the t-th moment. The blue light spectrum proportion value of the i-th luminosity detection interval in the combustion chamber at the t-th moment is multiplied by the smoke wind reflection degree ratio at the t-th moment, and the product is recorded as the flame color fullness factor of the i-th luminosity detection interval in the combustion chamber at the t-th moment. The blue light spectrum proportion value of the i-th luminosity detection interval in the combustion chamber at the t-th moment is multiplied by the smoke wind reflection degree ratio at the t-th moment, and the product is recorded as the flame color fullness factor of the i-th luminosity detection interval in the combustion chamber at the t-th moment.

[0026] Further, the flame color health coefficient of the generated flame in the combustion chamber at the t-th moment is determined according to the difference between the flame color fullness factors of different luminosity detection intervals in the combustion chamber at the t-th moment, and includes: The mean value of the difference between the flame color fullness factors of all adjacent luminosity detection intervals in the combustion chamber at the t-th moment is recorded as the flame color loss degree of the flame in the combustion chamber at the t-th moment along the ejection direction.

[0027] The mean value of the flame color fullness factors of all luminosity detection intervals in the combustion chamber at the t-th moment is obtained, and the normalized value of the ratio between the mean value of the flame color fullness factors and the flame color loss degree of the flame in the combustion chamber at the t-th moment along the ejection direction is recorded as the flame color health coefficient of the generated flame in the combustion chamber at the t-th moment.

[0028] The mean value of the flame color fullness factors of all luminosity detection intervals in the combustion chamber at the t-th moment is obtained, and the normalized value of the ratio between the mean value of the flame color fullness factors and the flame color loss degree of the flame in the combustion chamber at the t-th moment along the ejection direction is recorded as the flame color health coefficient of the generated flame in the combustion chamber at the t-th moment. The mean value of the flame color fullness factors of all luminosity detection intervals in the combustion chamber at the t-th moment is obtained, and the normalized value of the ratio between the mean value of the flame color fullness factors and the flame color loss degree of the flame in the combustion chamber at the t-th moment along the ejection direction is recorded as the flame color health coefficient of the generated flame in the combustion chamber at the t-th moment.

[0029] Further, the determination of the combustion machine input combustion supporting wind pressure at the current moment includes:

[0030] The reciprocal of the distance from the flame ejection port to the highest temperature point of the heat exchanger in the combustion chamber at the t-th moment is obtained, and the absolute value of the difference between the temperature values of the flame ejection port and the highest temperature point of the heat exchanger in the combustion chamber at the t-th moment is recorded as the inverse proportional normalized value of The product of the reciprocal and the inverse proportional normalized value of is recorded as the thermal force concentration degree of heat conduction at the t-th moment. The thermal force concentration degree of heat conduction at the t-th moment is determined according to the flame color health coefficient of the generated flame in the combustion chamber at the t-th moment.

[0031] The combustion machine combustion supporting wind pressure requirement degree at the t-th moment is determined according to the thermal force concentration degree of heat conduction at the t-th moment and the flame color health coefficient of the generated flame in the combustion chamber at the t-th moment. The current moment is recorded as the t-th moment.

[0032] The current moment is recorded as the t-th moment. ​​​​​​​​​​​​​The time, the first The time and the first The absolute value of the difference between the gas pressure at the time and the first

[0033] According to the target difference value and the combustion machine combustion air pressure demand degree at the first time, determine the air pressure regulation range of the combustion air pressure at the first time.

[0034] According to the air pressure regulation range of the combustion air pressure at the first time and the combustion air pressure at the first time, determine the combustion air pressure input by the combustion machine at the first time.

[0035] Further, the combustion machine combustion air pressure demand degree at the first time is determined according to the heat concentration degree of heat conduction at the first time and the flame color health coefficient of the generated flame in the combustion chamber at the first time, including:

[0036] The normalized value of the product of the heat concentration degree of heat conduction at the first time and the flame color health coefficient of the generated flame in the combustion chamber at the first time is recorded as the combustion machine combustion air pressure demand degree at the first time.

[0037] Further, the air pressure regulation range of the combustion air pressure at the first time is determined according to the target difference value and the combustion machine combustion air pressure demand degree at the first time, including:

[0038] When the gas pressure at the first time is greater than the gas pressure at the first time, the normalized value of the product of the target difference value and the combustion machine combustion air pressure demand degree at the first time is recorded as the air pressure regulation range of the combustion air pressure at the first time.

[0039] When the gas pressure at the first time is less than or equal to the gas pressure at the first time, the negative value of the normalized value of the ratio of the target difference value to the combustion machine combustion air pressure demand degree at the first time is recorded as the air pressure regulation range of the combustion air pressure at the first time.

[0040] Further, the combustion air pressure at the first time is determined according to the air pressure regulation range of the combustion air pressure at the first At what moment, the combustion-supporting wind pressure is determined. The combustion air pressure input to the burner at this time includes:

[0041] Get preset constant and the first The sum of the pressure control amplitudes of the combustion air pressure at any given time, and the sum of these values ​​with the first... The product of the combustion air pressure at time t is denoted as the i-th The combustion air pressure input to the burner at any given time.

[0042] The beneficial effects of the technical solution of the present invention are:

[0043] In this embodiment of the invention, firstly, an oxygen deficiency index for the mixed gas is obtained based on the carbon and nitrogen content level and particulate size of the flue gas generated by the burner. Then, the flue gas air demand responsiveness is evaluated in conjunction with the flue gas temperature. Subsequently, a flame richness factor is obtained by coordinating the spectral performance of the flame generated in the combustion chamber. The flame health coefficient is obtained by combining the spectral performance of the multi-photometric detection area within the range of the generated flame. Then, the combustion air pressure demand is obtained by combining the thermal concentration reflected by the heat exchanger. The combustion air pressure is then negatively fed back and adjusted through the combustion air pressure demand. Thus, this invention can adaptively adjust the combustion air pressure to a more suitable level based on the flue gas and flame performance generated in the combustion chamber in actual gas burner scenarios, thereby optimizing the air-fuel ratio of the burner and improving the accuracy of intelligent air-fuel linkage control of the burner. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a flowchart of the intelligent air-gas linkage control system for a gas burner according to the present invention.

[0046] Figure 2 This is the first schematic diagram of a gas burner structure;

[0047] Figure 3 This is the second schematic diagram of the gas burner structure;

[0048] Figure 4 A schematic diagram illustrating the application of a burner attached to a coating drying oven;

[0049] Figure 5 This is a schematic diagram showing the division of the photometric detection zone in the combustion chamber;

[0050] Figure 6This is a schematic diagram showing the relationship between flue gas temperature and air-fuel ratio. Detailed Implementation

[0051] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of an intelligent air-gas linkage control system for a gas burner proposed according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0052] Unless otherwise defined, 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 pertains.

[0053] The following description, in conjunction with the accompanying drawings, details the specific scheme of the intelligent air-gas linkage control system for a gas burner provided by the present invention.

[0054] Please see Figure 1 The diagram illustrates a module flowchart of an intelligent air-gas linkage control system for a gas burner according to an embodiment of the present invention. The system includes the following modules:

[0055] Module 101: Data Acquisition Module.

[0056] This module is used to acquire, at every moment during the operation of the gas burner, the gas pressure, combustion air pressure, flue gas temperature, flue gas particulate matter concentration, carbon monoxide and nitrogen oxide concentration in the flue gas, as well as the flame color spectrum of each photometric detection zone 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.

[0057] It should be noted that a gas burner mixes input gas and air, then ignites the mixture in a combustion chamber, thereby converting chemical energy into heat energy which is then transferred to the application end for heat supply. The first diagram shows the structure of a gas burner. Figure 2 As shown, Figure 2 This includes: 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 diagram shows the structure of the gas burner.Figure 3 as shown in FIG. 1, Figure 3 The system includes: 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 device interior according to the thermal 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 equipped in the curing oven, drying oven, etc. in the coating, electroplating, etc. industry, and other application ends with heat demand. The application schematic diagram of the combustion machine attached to the coating drying oven is shown in FIG. 2, Figure 4 as shown in FIG. 3, Figure 4 The system includes: 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 adapt to 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.

[0058] 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.

[0059] 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 air and gas linkage device for subsequent analysis and use.

[0060] 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 in the middle. 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 in the combustion chamber and the temperature value of the flame injection port and the highest temperature point of the heat exchanger.

[0061] Module 102: flue gas wind analysis module.

[0062] 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.

[0063] It should be noted that the purpose of this embodiment is to optimize the air-fuel ratio by adjusting the combustion air pressure. Therefore, the flue gas demand response is first evaluated based on the performance of the flue gas generated during the chemical reaction in the burner. Based on the flue gas demand response, the heating performance of the flame generated in the combustion chamber is analyzed to obtain the combustion air pressure demand. Then, the combustion air pressure of the burner is negatively fed back and controlled based on the combustion air pressure demand. The combustion air and fuel gas mixture undergoes a chemical reaction in the combustion chamber for combustion, producing a large amount of flue gas. Changes in the air-fuel ratio will have a correlated impact on the concentration of carbon and nitrogen oxides, particulate matter, and temperature of the generated flue gas. Therefore, the flue gas demand response is first evaluated based on the flue gas performance. In this embodiment, the combustion air pressure for the first 3 seconds of burner operation is selected using a traditional preset fixed ratio adjustment method. The combustion air pressure for subsequent times is adaptively obtained using the following method.

[0064] Preferably, in one embodiment of the present invention, the method for obtaining the flue gas wind demand response at each moment includes:

[0065] The ratio of the concentrations of carbon monoxide and nitrogen oxides in the flue gas at each time point is recorded as the carbon-nitrogen ratio of the flue gas at each time point.

[0066] The first The carbon-to-nitrogen ratio of flue gas at time t and the first The ratio of carbon to nitrogen in the flue gas at time t is denoted as the i-th time. The carbon-to-nitrogen ratio of the flue gas tends to be high at any given time.

[0067] It should be noted that when the combustion air pressure is too high relative to the gas pressure, the air-fuel ratio is too high. In this case, excess oxygen reacts with nitrogen, generating a large amount of nitrogen oxides in the flue gas. Conversely, when the air-fuel ratio is too low, the combustion reaction is incomplete, leading to a significant increase in carbon monoxide emissions. If the carbon-to-nitrogen ratio in the flue gas increases at each moment compared to the previous moment, it indicates a stronger tendency for the burner's air-fuel ratio to be too low. When the air-fuel ratio is too low, the air content entering the combustion chamber is relatively low, and in an oxygen-deficient environment, the heavier components of the gas do not burn completely, thermally decomposing into solid carbon particles, resulting in a high concentration of particulate matter in the flue gas. The higher the concentration of particulate matter in the flue gas at each moment, and the greater the tendency for the carbon-to-nitrogen ratio to increase at the same moment, the higher the likelihood that the gas mixture in the burner is in an oxygen-deficient state.

[0068] In the In all moments before moment 1, obtain the information related to the first moment. The average of the particulate matter concentration values ​​of flue gas at all times with the same gas pressure at time t is obtained, and then the t is obtained. The normalized value of the difference between the current particulate matter concentration value and the mean value is used to compare the normalized value of the difference with the value at the specified time. The product of the flue gas carbon-nitrogen ratio at the moment and the height is recorded as the flue gas carbon-nitrogen ratio at the moment The flue gas mixed gas oxygen deficiency index at the moment.

[0069] It should be noted that the linear normalization function is used in this embodiment The difference value is normalized to 0 to 1 by the linear normalization function. When the combustion air pressure is too high, that is, the air-fuel ratio is too high, at this time, the excess cold air in the combustion chamber absorbs the combustion heat, causing the flue gas temperature to decrease, resulting in a decrease in heat conversion efficiency. When the combustion air pressure is too low, that is, the air-fuel ratio is too low, at this time, the combustion is insufficient, and the oxygen-deficient environment causes the gas to be incompletely burned, which also causes the flue gas temperature to decrease, resulting in a decrease in heat conversion efficiency. Therefore, when the combustion air pressure tends to be highly adaptive, the flue gas should exhibit a higher temperature at this time, so the flue gas temperature performance is evaluated on the basis of the flue gas mixed gas oxygen deficiency index. The relationship between the flue gas temperature and the air-fuel ratio is shown in FIG. Figure 6 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 the air-fuel ratio is too high, the flue gas temperature is low, and when the air-fuel ratio is moderate, that is, at the dotted line, the flue gas temperature is high.

[0070] At the moment, the maximum flue gas temperature among the flue gas temperatures at all moments with the same gas pressure as the flue gas temperature at the moment is obtained, and the combustion air pressure at the moment corresponding to the maximum flue gas temperature is recorded as the target combustion air pressure. The maximum flue gas temperature among the flue gas temperatures at all moments with the same gas pressure as the flue gas temperature at the moment is obtained, and the combustion air pressure at the moment corresponding to the maximum flue gas temperature is recorded as the target combustion air pressure.

[0071] The normalization value of the difference between the maximum flue gas temperature and the flue gas temperature at the moment is recorded as the first difference value, and the normalization value of the difference between the target combustion air pressure and the combustion air pressure at the moment is recorded as the second difference value. The product of the first difference value, the second difference value, and the flue gas mixed gas oxygen deficiency index at the moment is recorded as the flue gas wind reflection degree at the moment. The normalization value of the difference between the maximum flue gas temperature and the flue gas temperature at the moment is recorded as the first difference value, and the normalization value of the difference between the target combustion air pressure and the combustion air pressure at the moment is recorded as the second difference value. The product of the first difference value, the second difference value, and the flue gas mixed gas oxygen deficiency index at the moment is recorded as the flue gas wind reflection degree at the moment. The product of the first difference value, the second difference value, and the flue gas mixed gas oxygen deficiency index at the moment is recorded as the flue gas wind reflection degree at the moment.

[0072] It should be noted that the linear normalization function is used in this embodiment The difference value is normalized to 0 to 1 by the linear normalization function. When the combustion air pressure is too high, that is, the air-fuel ratio is too high, at this time, the excess cold air in the combustion chamber absorbs the combustion heat, causing the flue gas temperature to decrease, resulting in a decrease in heat conversion efficiency. When the combustion air pressure is too low, that is, the air-fuel ratio is too low, at this time, the combustion is insufficient, and the oxygen-deficient environment causes the gas to be incompletely burned, which also causes the flue gas temperature to decrease, resulting in a decrease in heat conversion efficiency. Therefore, when the combustion air pressure tends to be highly adaptive, the flue gas should exhibit a higher temperature at this time, so the flue gas temperature performance is evaluated on the basis of the flue gas mixed gas oxygen deficiency index. The relationship between the flue gas temperature and the air-fuel ratio is shown in FIG.​​​​

[0073] Module 103: Flame color analysis module.

[0074] This module is used to determine the flame health coefficient of the generated flame 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 air demand reflectance.

[0075] It should be noted that: a combustion air pressure highly compatible with the gas pressure can catalyze a more complete combustion reaction in the combustion chamber, resulting in a strong and healthy flame color and improved heat exchange efficiency. Therefore, this embodiment evaluates the flame appearance in the combustion chamber and then matches the flue gas air demand response with the flame appearance to obtain the combustion air pressure demand at the analysis time. Since the flame generated by the burner is located inside the combustion chamber, and there is a flame color spectral detection module above the combustion chamber, the emission spectrum data of the flame color within the photometric detection range corresponding to different flame ranges in the combustion chamber can be obtained. When the combustion air pressure is highly compatible with the gas pressure, the combustion reaction is more complete, and a blue flame color will appear in the combustion chamber. Since blue light is mainly located in the emission band of 400 to 460 nanometers, for a single photometric detection range in the combustion chamber at a single moment, the spectral value of the blue light band in the flame emission spectrum of that range is extracted to represent the combustion effect.

[0076] Preferably, in one embodiment of the present invention, the method for obtaining the flame color health coefficient of the generated flame in the combustion chamber at each moment includes:

[0077] The preset wavelength range is [400, 460] nanometers, and this will be used as an example for description.

[0078] In the In the combustion chamber at the moment In the flame color spectrum of each photometric detection interval, the sum of the intensities corresponding to all wavelengths is obtained and recorded as the total spectral value. The mean of the intensities corresponding to all wavelengths within the preset wavelength range is obtained and recorded as the mean of the blue light spectrum. The ratio of the mean of the blue light spectrum to the total spectral value is recorded as the i-th value. In the combustion chamber at the moment The percentage of blue light spectrum in each photometric detection range.

[0079] The first In the combustion chamber at the moment The proportion of blue light spectrum in each photometric detection interval and the first The ratio of the flue gas wind demand response rate at a given time is denoted as the first value. In the combustion chamber at the moment Flame color abundance factor in each photometric detection range.

[0080] It should be noted that: the first In the combustion chamber at the moment The higher the proportion of blue light in each photometric detection interval, the greater the likelihood of complete combustion. The smaller the flue gas flow rate of the burner at any given time, the more abundant the flame color.

[0081] Get the The mean of the differences in flame abundance factors among all adjacent photometric detection intervals in the combustion chamber at time t is denoted as the i-th time. Flame color loss in the combustion chamber along the ejection direction at a given moment.

[0082] It should be noted that in this embodiment, the combustion chamber is aligned with the direction of flame ejection, i.e. Figure 5 From left to right, the difference between the flame abundance factor of the preceding and following photometric detection intervals is calculated sequentially, thus obtaining the mean of the differences in flame abundance factors across all adjacent photometric detection intervals. When the combustion air pressure is too low, the proportion of fuel gas in the gas mixture is higher, resulting in a stronger flame and less loss of blue flame color during complete combustion along the flame ejection direction. Conversely, when the combustion air pressure is too high, the proportion of air is higher, resulting in a weaker and more turbulent flame and greater loss of blue flame color during complete combustion along the flame ejection direction. A smaller flame abundance factor at the far end of the photometric detection interval compared to the near end indicates a greater loss of flame color.

[0083] Get the The mean value of the flame abundance factor in all photometric detection intervals in the combustion chamber at time t is used to compare the mean value of this flame abundance factor with the mean value of the first time. The normalized value of the ratio of flame color loss along the ejection direction in the combustion chamber at time t is denoted as the i-th The flame color health coefficient of the flame generated in the combustion chamber at any given time.

[0084] It should be noted that: this embodiment uses The linear normalization function normalizes this ratio to between 0 and 1. If the flame abundance factor level is higher in all photometric detection intervals at each time step, and the flame loss is smaller in the flame ejection direction, it indicates that the flame is stronger and the flame generated in the combustion chamber is healthier.

[0085] Module 104: Combustion-supporting air pressure control module.

[0086] The module is used for determining the combustion-supporting air pressure input by the combustion machine at the current moment according to the distance from the flame spout to the highest temperature point of the heat exchanger and the temperature difference between the flame spout and the highest temperature point of the heat exchanger in the combustion chamber at each moment, and the flame color health coefficient of the generated flame in the combustion chamber.

[0087] It should be noted that: further, the flame color health coefficient needs to be verified by the temperature distribution of the heat exchanger in front of the flame in the combustion chamber, when the generated flame has strong and stable performance, the heat conduction direction of the generated heat is less likely to be deviated, if the highest temperature point of the heat exchanger surface is closer to the flame spout, that is, the flame injection direction is in a straight line, and the temperature difference between the flame spout temperature and the highest temperature of the heat exchanger surface is smaller, then it indicates that the heat conduction direction of the flame has more stable and concentrated performance.

[0088] Preferably, in an embodiment of the present application, the method for obtaining the combustion-supporting air pressure input by the combustion machine at the current moment comprises:

[0089] obtaining the reciprocal of the distance from the flame spout to the highest temperature point of the heat exchanger in the combustion chamber at the first moment, obtaining the absolute value of the difference between the temperature value of the flame spout and the highest temperature point of the heat exchanger in the combustion chamber at the first moment obtaining the inverse proportional normalized value of the absolute value of the difference between the temperature value of the flame spout and the highest temperature point of the heat exchanger in the combustion chamber at the first moment the product of the reciprocal and the inverse proportional normalized value is recorded as the thermal concentration degree of heat conduction at the first moment.

[0090] wherein, the inverse proportional normalized value is taken as

[0091] the normalized value of the product of the thermal concentration degree of heat conduction at the first moment and the flame color health coefficient of the generated flame in the combustion chamber at the first moment is recorded as the combustion-supporting air pressure demand degree of the combustion machine at the first moment. It should be noted that: in the embodiment, the product of the flame color health coefficient is normalized to 0 to 1 by using a linear normalization function. The higher the flame color health coefficient of the generated flame in the combustion chamber at each moment, and the higher the thermal concentration degree of the flame heat conduction, the higher the proportion of the mixed gas at each moment, at this time, the combustion-supporting air pressure can be moderately increased. According to the above manner, the combustion-supporting air pressure demand degree of the combustion machine at each moment can be obtained.

[0092] The current moment is recorded as the first moment, and the first moment is recorded as the first moment.

[0093] According to the above manner, the combustion-supporting air pressure demand degree of the combustion machine at each moment can be obtained.

[0094] The current moment is recorded as the first moment, and the first moment is recorded as the first moment. ​​​​​​​​The time difference between the first time and the second time is recorded as a target difference value. The absolute value of the difference between the gas pressure at the first time and the gas pressure at the second time is recorded as a target difference value.

[0095] When the gas pressure at the first time is greater than the gas pressure at the second time, the product of the target difference value and the normalized value of the combustion-supporting air pressure demand degree at the second time is recorded as the air pressure regulation range of the combustion-supporting air pressure at the first time. When the gas pressure at the first time is greater than the gas pressure at the second time, the product of the target difference value and the normalized value of the combustion-supporting air pressure demand degree at the second time is recorded as the air pressure regulation range of the combustion-supporting air pressure at the first time. When the gas pressure at the first time is greater than the gas pressure at the second time, the product of the target difference value and the normalized value of the combustion-supporting air pressure demand degree at the second time is recorded as the air pressure regulation range of the combustion-supporting air pressure at the first time.

[0096] When the gas pressure at the first time is less than or equal to the gas pressure at the second time, the negative value of the ratio of the target difference value and the normalized value of the combustion-supporting air pressure demand degree at the second time is recorded as the air pressure regulation range of the combustion-supporting air pressure at the first time. When the gas pressure at the first time is less than or equal to the gas pressure at the second time, the negative value of the ratio of the target difference value and the normalized value of the combustion-supporting air pressure demand degree at the second time is recorded as the air pressure regulation range of the combustion-supporting air pressure at the first time. When the gas pressure at the first time is less than or equal to the gas pressure at the second time, the negative value of the ratio of the target difference value and the normalized value of the combustion-supporting air pressure demand degree at the second time is recorded as the air pressure regulation range of the combustion-supporting air pressure at the first time.

[0097] In this embodiment, a 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 0-1.

[0098] The preset constant is 1, which is used as an example for description.

[0099] The sum of the preset constant and the air pressure regulation range of the combustion-supporting air pressure at the first time is recorded as the product of the preset constant and the combustion-supporting air pressure at the second time. The sum of the preset constant and the air pressure regulation range of the combustion-supporting air pressure at the first time is recorded as the product of the preset constant and the combustion-supporting air pressure at the second time. The sum of the preset constant and the air pressure regulation range of the combustion-supporting air pressure at the first time is recorded as the product of the preset constant and the combustion-supporting air pressure at the second time.

[0100] It should be noted that the gas pressure is the main influencing index of the combustion-supporting air pressure regulation, and the changes of the two are approximately proportional, so the regulation direction of the real-time combustion-supporting air pressure is determined by the real-time and the last time gas pressure. If the current gas pressure is greater than the last time, the combustion-supporting air pressure is increased, and the higher the combustion-supporting air pressure demand degree of the last 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 last time, the combustion-supporting air pressure is reduced, but the higher the combustion-supporting air pressure demand degree of the last time, the less the real-time combustion-supporting air pressure needs to be adjusted.

[0101] ​​​​​​It needs to be further explained that: the complete process of the intelligent wind-gas linkage control of the improved gas combustion machine is: (1) for the execution task with low coating drying precision requirement, the combustion machine executes the whole drying process according to the above-mentioned real-time combustion air pressure; (2) for the execution task with high coating drying precision requirement, the combustion machine executes the whole drying process and then enters the wind pressure regulation range fine adjustment stage after 10 seconds; (3) in the wind pressure range fine adjustment stage, the current combustion air pressure requirement degree of the two time points is obtained; (4) in the case that the current gas pressure is large, i.e. the combustion air pressure needs to be adjusted to be high, if the current combustion air pressure requirement degree obtained by the self-adaptive combustion air pressure is higher than the combustion air pressure of the last time point, it indicates that the self-adaptive combustion air pressure range level is lower than the ideal range, so the real-time self-adaptive combustion air pressure range level is adjusted to be higher by a preset 8%, otherwise, it is considered that the self-adaptive combustion air pressure is excellent, and no range fine adjustment is performed; (5) in the case that the current gas pressure is small, i.e. the combustion air pressure needs to be adjusted to be low, if the current combustion air pressure requirement degree obtained by the self-adaptive combustion air pressure is lower than the combustion air pressure of the last time point, it indicates that the self-adaptive combustion air pressure range level is lower than the ideal range, so the real-time self-adaptive combustion air pressure range level is adjusted to be higher by a preset 8%, otherwise, it is considered that the self-adaptive combustion air pressure is excellent, and no range fine adjustment is performed. Thus, the combustion machine with self-adaptive combustion air pressure completes all drying execution tasks, thereby optimizing the air-fuel ratio in the combustion process, and realizing an intelligent wind-gas linkage control method with higher task demand adaptation of the gas combustion machine.

[0102] Thus, the present application is completed.

[0103] In summary, in the embodiment of the present application, according to the concentration value difference of carbon monoxide and nitrogen oxides in the flue gas at the same time, combined with the concentration value difference of flue gas particles, the temperature difference of flue gas and the combustion air pressure difference at different time corresponding to the same gas pressure, the flue gas wind reflection degree at each time is determined, then combined with the difference between the flame color spectrum of different light detection intervals in the combustion chamber at each time, the flame color health coefficient of the generated flame in the combustion chamber at each time is determined, and then combined with the distance from the flame jet to the highest temperature point of the heat exchanger and the temperature value difference between the flame jet and the highest temperature point of the heat exchanger in the combustion chamber at each time, the combustion air pressure input by the combustion machine at the current time is determined. The present application adjusts and controls the self-adaptive combustion air pressure by combining the flue gas and the flame, so as to optimize the intelligent wind-gas control effect of the combustion machine.

[0104] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the principles of the present application should be included in the protection scope of the present application.

Claims

1. An intelligent air-gas linkage control system for a gas burner, characterized in that, The system comprises the following modules: A data acquisition module: used for acquiring 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 photometric 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 machine; A flue gas wind demand analysis module: used for determining the flue gas wind demand reflection degree at each moment according to the difference in the concentration values of carbon monoxide and nitrogen oxides in the flue gas at the same moment, in combination with the differences in the flue gas particulate matter concentration value, flue gas temperature, and combustion air pressure at different moments corresponding to the same gas pressure; A flame color analysis module: used for determining the flame color health coefficient of the generated flame in the combustion chamber at each moment according to the difference between the flame color spectrums of different photometric detection intervals in the combustion chamber at each moment, in combination with the flue gas wind demand reflection degree; A combustion air pressure control module: used for determining the combustion air pressure input by the combustion machine at the current moment according to the distance from the flame spout in the combustion chamber to the highest temperature point of the heat exchanger and the difference in the temperature values of the flame spout and the highest temperature point of the heat exchanger at each moment, in combination with the flame color health coefficient of the generated flame in the combustion chamber; The determination of the flame color health coefficient of the generated flame in the combustion chamber at each moment comprises: In the In the combustion chamber at the moment In the flame color spectrum of each photometric detection interval, the sum of the intensities corresponding to all wavelengths is obtained and recorded as the total spectral value. The mean of the intensities corresponding to all wavelengths within the preset wavelength range is obtained and recorded as the mean of the blue light spectrum. The ratio of the mean of the blue light spectrum to the total spectral value is recorded as the i-th value. In the combustion chamber at the moment The percentage of blue light spectrum in each photometric detection range; The first In the combustion chamber at the moment The proportion of blue light spectrum in each photometric detection interval and the first The ratio of the flue gas wind demand response rate at a given time is denoted as the i-th. In the combustion chamber at the moment Flame color abundance factor in each photometric detection range; According to the difference of the flame color fullness factor of different light intensity detection intervals in the combustion chamber at the first time point, the flame color health coefficient of the generated flame in the combustion chamber at the first time point is determined. According to the difference of the flame color fullness factor of different light intensity detection intervals in the combustion chamber at the first time point, the flame color health coefficient of the generated flame in the combustion chamber at the first time point is determined. According to the difference of the flame color fullness factor of different light intensity detection 2. The intelligent draft gas linkage control system for a gas-fired combustion machine of claim 1, wherein, The determination of the flue gas wind demand reflection degree at each moment comprises: Acquiring the ratio of the concentration values of carbon monoxide and nitrogen oxides in the flue gas at each moment, denoted as the flue gas carbon-nitrogen ratio at each moment; The first The carbon-to-nitrogen ratio of flue gas at time t and the first The ratio of carbon to nitrogen in the flue gas at time t is denoted as the i-th time. The carbon-to-nitrogen ratio of the flue gas tends to be high at any given time. At all times before the first time, according to the same gas pressure as the first time, all times and the first time flue gas particulate matter concentration value difference, flue gas temperature difference and combustion air pressure difference, combined with the first time flue gas carbon nitrogen ratio tends to high, determine the first time flue gas wind needs to reflect the degree.

3. The intelligent draft gas linkage control system for a gas-fired combustion machine of claim 2, wherein, The time before the first all the time, according to the same time as the gas pressure of the first the concentration of flue gas particles at the first The difference between the flue gas temperature difference and the combustion air pressure difference, combined with the flue gas carbon nitrogen ratio at the first The time of the first The flue gas wind needs to reflect the degree of the first In the In all moments before moment 1, obtain the information related to the first moment. The average of the particulate matter concentration values ​​of flue gas at all times with the same gas pressure at time t is then obtained, and compared with the value at time t. The maximum flue gas temperature among all flue gas temperatures at the same time under the same gas pressure is recorded as the target combustion air pressure. Get the The normalized value of the difference between the particulate matter concentration at time t and the mean of the particulate matter concentration at time t is compared with the value at time t. The product of the carbon-to-nitrogen ratio of the flue gas at time t is denoted as the product of the heights at time t. The oxygen deficiency index of the flue gas mixture at that time; a normalized value of a difference between the maximum flue gas temperature and the flue gas temperature at the time point is calculated, and is denoted as a first difference value a normalized value of a difference between the target combustion air pressure and the combustion air pressure at the time point is calculated, and is denoted as a second difference value a product of the first difference value, the second difference value, and an oxygen deficiency index of the flue gas mixed gas at the time point is calculated, and is denoted as a flue gas wind reflection degree at the time point a product of the first difference value, the second difference value, and an oxygen deficiency index of the flue gas mixed gas at the time point is calculated, and is denoted as a flue gas wind reflection degree at the time point a product of the first difference value, the second difference value, and an oxygen deficiency index of the flue gas mixed gas at the time point is calculated, and is denoted as a flue gas wind reflection degree at the time point 4. The intelligent draft gas linkage control system for a gas-fired combustion machine of claim 1, wherein, The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: the average value of the difference of the flame color fullness factors of all adjacent light intensity detection intervals in the combustion chamber at the time point is recorded as the flame color fullness factor difference of the combustion chamber at the time point the average value of the difference of the flame color fullness factors of all adjacent light intensity detection intervals in the combustion chamber at the time point is recorded as the flame color fullness factor difference of the combustion chamber at the time point the flame color loss degree of the flame in the combustion chamber along the eruption direction at the time point acquire the average value of the flame color fullness factor of all the light intensity detection intervals in the combustion chamber at the time point the average value of the flame color fullness factor at the time point 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 point the flame color health coefficient of the generated flame in the combustion chamber at the time point 5. The intelligent draft gas linkage control system for a gas-fired combustion machine of claim 1, wherein, The determination of the combustion air pressure input by the combustion machine at the current moment comprises: the reciprocal of the distance from the flame injection port to the highest temperature point of the heat exchanger in the combustion chamber at the first time point the reciprocal of the distance from the flame injection port to the highest temperature point of the heat exchanger in the combustion chamber at the first time point the absolute value of the difference between the temperature values of the flame injection port and the highest temperature point of the heat exchanger in the combustion chamber at the first time point the reciprocal of the absolute value of the difference between the temperature values of the flame injection port and the highest temperature point of the heat exchanger in the combustion chamber at the first time point the product of the reciprocal and the reciprocal of the absolute value of the difference between the temperature values of the flame injection port and the highest temperature point of the heat exchanger in the combustion chamber at the first time point the thermal force concentration degree of heat conduction at the first time point According to the first The thermal concentration degree of heat conduction at the first The flame color health coefficient of the generated flame in the combustion chamber at the first The combustion-supporting air pressure demand degree at the first Let the current time be the first time, the first time and the first time difference absolute value of the gas pressure, recorded as the target difference value; Based on the target difference value and the first The required combustion air pressure of the burner at a given time is determined. The range of air pressure adjustment for combustion-supporting air pressure at any given time; According to the first The wind pressure control range of the combustion-supporting wind pressure at the second The combustion-supporting wind pressure at the second The combustion-supporting wind pressure inputted by the combustion machine at the second 6. The intelligent draft gas linkage control system of claim 5, wherein, According to the first The thermal concentration of heat conduction at time t and the first The flame color health coefficient of the generated flame in the combustion chamber at a given time is used to determine the first... The current combustion air pressure requirements of the burner include: The first The thermal concentration of heat conduction at time t and the first The normalized value of the product of the flame color health coefficients of the generated flame in the combustion chamber at time t is denoted as the i-th The required combustion air pressure of the burner at any given time.

7. The intelligent draft gas linkage control system for a gas-fired combustion machine of claim 5, wherein, The target difference value is determined according to the combustion-supporting air pressure requirement degree of the target time point and the combustion-supporting air pressure requirement degree of the current time point. The wind pressure regulation range of the combustion-supporting air pressure at the target time point is determined according to the combustion-supporting air pressure requirement degree of the target time point and the combustion-supporting air pressure requirement degree of the current time point. The wind pressure regulation range of the combustion-supporting air When the The gas pressure at time is greater than the first When the gas pressure is at a given time, the target difference value is compared with the first... The normalized value of the product of the combustion air pressure demand of the burner at time t is denoted as the i-th The range of air pressure adjustment for combustion-supporting air pressure at any given time; When the gas pressure at the first moment is less than or equal to the gas pressure at the second moment, the target difference value is multiplied by the negative value of the normalized value of the ratio of the combustion-supporting air pressure demand degree at the first moment, and the result is recorded as the air pressure regulation range of the combustion-supporting air pressure at the second moment.

8. The intelligent draft gas linkage control system of claim 5, wherein, The method according to the first The wind pressure regulation range of the combustion-supporting wind pressure at the second The combustion-supporting wind pressure at the second The combustion-supporting wind pressure input by the combustion machine at the second acquiring a sum value of a product of the preset constant and the wind pressure regulation range of the combustion-supporting wind pressure at the first time point acquiring a sum value of a product of the preset constant and the wind pressure regulation range of the combustion-supporting wind pressure at the first time point acquiring a sum value of a product of the preset constant and the wind pressure regulation range of the combustion-supporting wind pressure at the first time point acquiring a sum value of a product of the preset constant and the wind pressure regulation range of the combustion-supporting wind pressure at the first time point

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