A smart control system and method for burners used in suspension kilns

Abstract

This invention discloses an intelligent control system and method for a burner used in a suspension kiln. The system includes a suspension kiln acquisition module, a PLC control system, a burner control actuator, a combustion air fan, and a primary air fan. The suspension kiln acquisition module collects combustion parameter information from the suspension kiln and transmits it to the PLC control system. The PLC control system, based on the real-time gas flow rate obtained from the combustion parameter information of the suspension kiln and an air-fuel ratio combustion optimization model, generates the ratio of gas flow rate to air flow rate and generates an air-fuel ratio parameter control signal for the igniter. The burner control actuator then adjusts the corresponding pneumatic valves of the burner. This invention, by constructing an integrated intelligent control system for the burner and an intelligent analysis method for combustion energy consumption ratio, enables intelligent analysis in the calculation of combustion energy consumption ratio, thereby improving the effect of the suspension kiln burner on the complete combustion of materials.

Description

Technical Field

[0001] This invention relates to the field of combustion technology for suspension kilns, and in particular to an intelligent control system and method for a burner used in suspension kilns. Background Technology

[0002] The burner of a suspension kiln is a device that continuously feeds fuel and air into the furnace, rationally organizes the coal powder airflow, and ensures good mixing, rapid and stable ignition and combustion. It is also widely used in boilers, asphalt mixing plants, oil fields, incinerators, hot blast stoves, foundry machinery, and industrial kilns.

[0003] Suspension kilns are simple in structure, easy to operate, and have good stability. The material in a suspension kiln is in a suspended state, resulting in a much higher heat and mass transfer rate than in fixed or fluidized beds. The gas inside the kiln is in a state of intense turbulence, leading to uniform fuel combustion, uniform furnace temperature, and uniform material heating. However, existing suspension kilns have low levels of intelligence in controlling reaction time, temperature, and flow rate, mainly in controlling the energy consumption ratio for complete combustion. Optimizing the key parameters of the suspension kiln burner is crucial for further uniform combustion, complete material combustion, and energy saving. Furthermore, traditional methods for optimizing the energy consumption ratio for complete combustion in suspension kilns still rely on manual calculation and analysis, which is generally inaccurate and lagging. Based on the shortcomings of current methods in terms of intelligence, accuracy, efficiency, and real-time performance in calculating the energy consumption ratio for complete combustion in suspension kilns, we propose an intelligent control system and method for suspension kiln burners. Summary of the Invention

[0004] In view of the problems existing in the above-mentioned existing suspension kiln burners, the present invention is proposed.

[0005] Therefore, one of the objectives of this invention is to provide an intelligent control system and method for a burner used in a suspension kiln. By constructing an integrated intelligent control system for the burner and an intelligent analysis method for the combustion energy consumption ratio, it can intelligently analyze and calculate the combustion energy consumption ratio, thereby improving the effect of the suspension kiln burner on the complete combustion of materials and achieving the effects of complete material combustion and energy saving.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] On one hand, the present invention provides an intelligent control system for a burner used in a suspension kiln, comprising:

[0008] The suspension kiln acquisition module is used to collect combustion parameter information of the suspension kiln and transmit it to the PLC control system. The suspension kiln acquisition module includes a temperature transmitter, a pressure transmitter and a gas flow meter. The temperature transmitter, pressure transmitter and gas flow meter are sequentially installed in the gas inlet pipe. After the temperature transmitter, pressure transmitter and gas flow meter convert the combustion parameter information into digital signals, they are transmitted to the PLC control system.

[0009] The PLC control system is connected to the suspension kiln acquisition module. It is used to obtain the real-time gas flow rate from the combustion parameter information of the suspension kiln, and based on the air-fuel ratio combustion optimization model, it generates the ratio of gas flow rate to air flow rate and generates the air-fuel ratio parameter control signal of the igniter to obtain the air flow rate value and gas flow rate for complete combustion.

[0010] The burner control actuator is connected to the PLC control system and is used to respond to the ignition opening parameter signal issued by the PLC control system. During the ignition process of the burner, after receiving the ignition opening parameter signal, the burner control actuator controls the ignition opening of the pneumatic valve according to the ignition opening parameter to adjust the corresponding pneumatic valve of the burner, so as to control the flame shape and temperature of the suspension kiln burner.

[0011] A combustion-supporting fan, connected to the burner, is used to respond to and adjust the parameters of the combustion-supporting fan according to the air-fuel ratio parameter control signal issued by the PLC control system.

[0012] A primary air fan, connected to the burner, is used to perform primary air blowing control in response to the primary air fan target parameters of the PLC control system.

[0013] In a preferred embodiment of the present invention, the pneumatic valve of the burner control actuator includes a large fire valve pneumatic valve and a small fire valve pneumatic valve.

[0014] As a preferred embodiment of the present invention, it further includes: an emergency shut-off valve, a pneumatic regulating valve, a venting valve, a purge valve, and a main emergency valve;

[0015] The emergency shut-off valve is connected to the gas flow meter, the pneumatic regulating valve is connected to the emergency shut-off valve, the main emergency valve is connected to the pneumatic regulating valve, the purge valve is connected to the inlet of the main emergency valve, the purge valve is connected to the outlet of the main emergency valve, the inlets of the large fire valve and the small fire valve are both connected to the outlet of the main emergency valve, and the outlets of the large fire valve and the small fire valve are connected to the inlet of the burner.

[0016] In a preferred embodiment of the present invention, the combustion parameter information includes igniter parameters, purge parameters, flame detector parameters, ignition opening parameters, combustion fan parameters, air-fuel ratio parameters, flame detector status parameters, primary air fan parameters, and combustion fan parameters.

[0017] As a preferred embodiment of the present invention, the igniter parameters include cooling time and ignition time parameters, wherein the cooling time is the time data for the igniter to cool within a preset time threshold after ignition, and the ignition time parameter is the parameter of the longest time for a single continuous ignition.

[0018] The purging parameter is the time parameter for the inert gas to purge the gas in the burner during the ignition or extinguishing process;

[0019] The flame detection parameter is the flame detection delay time parameter in which there is still flame output within the flame detection delay time;

[0020] The ignition opening parameter is the pneumatic valve ignition opening setting parameter during automatic ignition;

[0021] The combustion fan parameters are the combustion fan ignition speed ratio set parameters during automatic ignition;

[0022] The air-fuel ratio parameter includes the gas flow rate and the combustion air flow rate, and is the parameter information of the ratio of the gas flow rate to the combustion air flow rate. At the same time, the combustion air blower automatically adjusts the combustion air flow rate parameter according to the gas flow rate and the air-fuel ratio parameter.

[0023] The flame detection status parameters are those when the burner is in a default flame-on state.

[0024] The primary air fan parameters are changed by switching the source of the primary air fan target parameters in automatic mode, and the primary air fan parameters include the primary air fan hook status. The primary air fan hook status is that the primary air fan target parameters are automatically generated by the gas flow rate.

[0025] The combustion fan parameters are changed by switching the source of the target parameters of the combustion fan in automatic mode. The combustion fan parameters include the status of the combustion fan hook. The status of the combustion fan hook is that the target parameters of the combustion fan are automatically generated by the combustion air flow.

[0026] In a preferred embodiment of the present invention, the air-fuel ratio combustion optimization model is based on online analysis of the suspension kiln for optimized air-fuel ratio control. Specifically, it utilizes a PID control algorithm and parameter tuning calculations to achieve optimal control of the air-fuel ratio within the suspension kiln, as detailed below:

[0027]

[0028] In equation (1), u(t) is the control quantity of the air-fuel ratio, and k pLet T be the proportional gain, e(t) be the deviation between the controlled variable of the air-fuel ratio and the preset value, and T be the proportional gain. I Integral time constant, T D dt is the differential time constant, and dt is the differential sign;

[0029]

[0030] In equation (2), T is the total number of time series, α(t) is the control quantity of the simulated air-fuel ratio at the current time t, and w t The calibration parameter adjustment weighting coefficient for the simulated air-fuel ratio at the current time t;

[0031]

[0032] In equation (3), R t Q is the output value of the ignition opening of the PLC control system. t Let Q be the heat sample value at the current time t. t-1 F is the sampled value of the heat signal at the previous time t-1. t Let F be the sampled value of the combustion air flow rate at the current time t. t-1 This is the sampled value of the combustion air flow rate at the previous time t-1.

[0033] In a preferred embodiment of the present invention, the combustion-supporting fan is equipped with a frequency converter, and the frequency of the fan frequency converter is controlled by a PLC control system to adjust the fan speed, thereby completing the adjustment of the combustion-supporting airflow.

[0034] In a preferred embodiment of the present invention, the PLC control system further includes an early warning module. The early warning module is used to automatically shut down the burner in automatic mode when the flame detector fails to detect a flame signal and issues an alarm message and generates alarm data. Simultaneously, when the flame signal is unstable and the flame detector is disabled, the module notifies and arranges for manual monitoring of the flame status.

[0035] On one hand, this invention provides a method for an intelligent control system of a burner for a suspension kiln, which is an online air-fuel ratio optimization control method for suspension kilns, as detailed below:

[0036] The target data of the combustion parameters of the pre-set suspension kiln are used to automatically control the size of the gas electric regulating valve through the PLC control system to ensure that the actual gas flow rate matches the target flow rate.

[0037] After the gas inlet is connected and the gas volume is increased, the PLC control system obtains the real-time flow, pressure and temperature parameters of the gas through the suspension kiln acquisition module. Combined with the air-fuel ratio combustion optimization model, it analyzes and calculates the optimal combustion ratio of gas and air flow to obtain the air flow value information for complete combustion.

[0038] The PLC control system generates control signals for the combustion fan and burner actuators based on the air flow rate information of fully combusted air. Air flow control is then performed after matching the control signals. Specifically, the air flow control is achieved by using target data of the combustion parameters of the pre-set suspension kiln, which is calculated through real-time gas flow rate and air-fuel ratio analysis. The PLC control system controls the ignition opening parameters to control the ignition opening of the pneumatic valve and adjusts the fan speed by controlling the frequency of the fan inverter to complete the adjustment of the combustion air flow.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows: By constructing an integrated intelligent control system for burners and an intelligent analysis method for combustion energy consumption ratio, the present invention can intelligently analyze and calculate the combustion energy consumption ratio, thereby improving the effect of the suspension kiln burner on the complete combustion of materials, and achieving the effects of complete material combustion and energy saving. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments 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. Wherein:

[0041] Figure 1 This is a schematic diagram of the modular structure of the system of the present invention;

[0042] Figure 2 This is a schematic diagram of the piping connection of the burner for the suspension kiln in the system of the present invention;

[0043] Figure 3 This is another schematic diagram of the burner piping connection for the suspension kiln in the system of the present invention;

[0044] Figure 4 This is a schematic diagram of the graphical interface of the parameter page in the PLC control system of the present invention;

[0045] Figure 5 This is a schematic diagram of the graphical interface of the manual page in the PLC control system of the present invention.

[0046] Figure 6 This is a flowchart of the air-fuel ratio optimization control method for online analysis of a suspension kiln according to the present invention;

[0047] The following are the labeling elements in the diagram: 100, Suspension kiln data acquisition module; 101, PLC control system; 102, Burner control actuator; 103, Combustion fan; 104, Primary air fan; 200, Temperature transmitter; 201, Pressure transmitter; 202, Gas flow meter; 203, Pneumatic regulating valve; 204, Main emergency valve; 205, Main fire valve; 206, Small fire valve. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0049] Reference Figures 1-6 As one embodiment of the present invention, this embodiment provides an intelligent control system and method for a burner used in a suspension kiln. The intelligent control system for a burner used in a suspension kiln includes:

[0050] The suspension kiln acquisition module 100 is used to acquire combustion parameter information of the suspension kiln and transmit it to the PLC control system 101. The suspension kiln acquisition module 100 includes a temperature transmitter 200, a pressure transmitter 201 and a gas flow meter 202. The temperature transmitter 200, pressure transmitter 201 and gas flow meter 202 are sequentially installed in the pipeline of the gas inlet. After the temperature transmitter 200, pressure transmitter 201 and gas flow meter 202 convert the combustion parameter information into digital signals, they are transmitted to the PLC control system 101.

[0051] The PLC control system 101 is connected to the suspension kiln acquisition module 100. It is used to obtain the real-time gas flow rate from the combustion parameter information of the suspension kiln, and generate the ratio of gas flow rate to air flow rate based on the air-fuel ratio combustion optimization model. It also generates the air-fuel ratio parameter control signal of the igniter to obtain the air flow rate value and gas flow rate for complete combustion.

[0052] The burner control actuator 102 is connected to the PLC control system 101 and is used to respond to the ignition opening parameter signal issued by the PLC control system 101. During the ignition process of the burner, after receiving the ignition opening parameter signal, the burner control actuator 102 controls the ignition opening of the pneumatic valve according to the ignition opening parameter to adjust the corresponding pneumatic valve of the burner in order to control the flame shape and temperature of the suspension kiln burner.

[0053] The combustion blower 103 is connected to the burner and is used to adjust the parameters of the combustion blower 103 in response to and according to the air-fuel ratio parameter control signal issued by the PLC control system 101.

[0054] The primary air fan 104 is connected to the burner and is used to perform primary air blowing control work in response to the target parameters of the primary air fan 104 in the PLC control system 101.

[0055] Specifically, in this embodiment, the pneumatic valves of the burner control actuator 102 include a main fire valve 205 and a secondary fire valve 206.

[0056] Specifically, this embodiment also includes: an emergency shut-off valve, a pneumatic regulating valve 203, a vent valve, a purge valve, and a main emergency valve 204; wherein the emergency shut-off valve is connected to the gas flow meter 202, the pneumatic regulating valve 203 is connected to the emergency shut-off valve, the main emergency valve 204 is connected to the pneumatic regulating valve 203, the purge valve is connected to the inlet end of the main emergency valve 204, the purge valve is connected to the outlet end of the main emergency valve 204, the inlets of the large fire valve 205 and the small fire valve 206 are both connected to the outlet end of the main emergency valve 204, and the outlet ends of the large fire valve 205 and the small fire valve 206 are connected to the inlet end of the burner.

[0057] Specifically, in this implementation, the combustion parameter information includes igniter parameters, purge parameters, flame detector parameters, ignition opening parameters, combustion fan 103 parameters, air-fuel ratio parameters, flame detector status parameters, primary air fan 104 parameters, and combustion fan 103 parameters.

[0058] The igniter parameters include cooling time and ignition time parameters. Cooling time is the time data for the igniter to cool down within a preset time threshold after ignition, and ignition time parameter is the parameter of the longest time for a single continuous ignition.

[0059] The purging parameter is the time parameter for inert gas to purge the gas in the burner during the ignition or shutdown process;

[0060] The flame detection parameter is the flame detection delay time parameter that indicates there is still flame output within the flame detection delay time.

[0061] The ignition opening parameter is the setting parameter for the ignition opening of the pneumatic valve during automatic ignition.

[0062] The parameters of combustion fan 103 are the ignition speed ratio settings of combustion fan 103 during automatic ignition;

[0063] The air-fuel ratio parameter includes the gas flow rate and the combustion air flow rate, and is the parameter information of the ratio of the gas flow rate to the combustion air flow rate. At the same time, the combustion air blower 103 automatically adjusts the combustion air flow rate parameter according to the gas flow rate and the air-fuel ratio parameter.

[0064] The flame detection status parameters are those when the burner is in the default flame-on state.

[0065] The primary air fan 104 parameters are changed by switching the source of the target parameters of the primary air fan 104 in automatic mode. The primary air fan 104 parameters include the hook status of the primary air fan 104. The hook status of the primary air fan 104 means that the target parameters of the primary air fan 104 are automatically generated by the gas flow rate.

[0066] The parameters of the combustion fan 103 can be changed by switching the automatic mode to change the source of the target parameters of the combustion fan 103. The parameters of the combustion fan 103 include the hook status of the combustion fan 103. The hook status of the combustion fan 103 means that the target parameters of the combustion fan 103 are automatically generated by the combustion air flow.

[0067] Specifically, in this implementation, the air-fuel ratio combustion optimization model is based on online analysis of the suspension kiln for optimized air-fuel ratio control. Specifically, it utilizes a PID control algorithm and parameter tuning calculations to achieve optimal control of the air-fuel ratio within the suspension kiln, as detailed below:

[0068]

[0069] In equation (1), u(t) is the control quantity of the air-fuel ratio, and k p Let T be the proportional gain, e(t) be the deviation between the controlled variable of the air-fuel ratio and the preset value, and T be the proportional gain. I Integral time constant, T D dt is the differential time constant, and dt is the differential sign;

[0070]

[0071] In equation (2), T is the total number of time series, α(t) is the control quantity of the simulated air-fuel ratio at the current time t, and w t The calibration parameter adjustment weighting coefficient for the simulated air-fuel ratio at the current time t;

[0072]

[0073] In equation (3), R t Q is the output value of the ignition opening of the PLC control system 101. t Let Q be the heat sample value at the current time t. t-1 F is the sampled value of the heat signal at the previous time t-1. t Let F be the sampled value of the combustion air flow rate at the current time t. t-1 This is the sampled value of the combustion air flow rate at the previous time t-1.

[0074] In this preferred embodiment, the combustion fan 103 is equipped with a frequency converter, and the frequency of the fan frequency converter is controlled by the PLC control system 101 to adjust the fan speed, thereby completing the adjustment of the combustion air flow.

[0075] In addition, the PLC control system 101 of this implementation also includes an early warning module. The early warning module is used to automatically shut down the burner in automatic mode when the flame detection function is turned on but the flame detector does not detect a flame signal, and to issue an alarm message and generate alarm data. At the same time, when the flame signal is unstable and the flame detection function is disabled, the module will notify and arrange for manual monitoring of the flame status.

[0076] This embodiment also provides an air-fuel ratio optimization control method for online analysis of the suspension kiln, as detailed below:

[0077] The target data of the combustion parameters of the pre-set suspension kiln are used to automatically control the size of the gas electric regulating valve through the PLC control system 101 to ensure that the actual gas flow rate matches the target flow rate.

[0078] After the gas inlet is connected and the gas volume is increased, the PLC control system 101 obtains the real-time flow, pressure and temperature parameters of the gas through the suspension kiln acquisition module 100, and analyzes and calculates the optimal combustion ratio of gas and air flow by combining the air-fuel ratio combustion optimization model to obtain the air flow value information for complete combustion.

[0079] The PLC control system 101 generates control signals for the combustion fan 103 and the burner control actuator 102 based on the air flow value information of fully combusted air. The air flow is controlled after matching the control signals. Specifically, the air flow is controlled by the target data of the combustion parameters of the suspension kiln, that is, by analyzing and calculating the real-time gas flow and air-fuel ratio. The PLC control system 101 controls the ignition opening parameter to control the ignition opening of the pneumatic valve, and controls the frequency of the fan inverter to adjust the fan speed to complete the adjustment of the combustion air flow.

[0080] In this embodiment, it is important to emphasize that the PLC control system 101 has two PID controls: gas flow control and air flow control. Gas flow control is achieved by setting a target flow rate and automatically controlling the size of the gas electric regulating valve to ensure that the actual gas flow rate matches the target flow rate. Air flow control is achieved by setting a target air flow rate and calculating it based on the real-time gas flow rate and ratio. The PLC then controls the frequency of the fan inverter to adjust the fan speed and thus adjust the air flow rate.

[0081] The main process involves increasing the gas volume, and then the PLC acquires the real-time gas flow rate. By combining the optimal combustion ratio of gas and air flow, a fully combusted air flow rate can be obtained. The PLC then automatically adjusts the fan speed to achieve the target air flow rate.

[0082] The gas and air flow rates are theoretical values, representing the ideal ratio of gas to oxygen for complete combustion. Changes in fan speed affect air flow rate; similar to the speed settings of an electric fan, air flow rate can be considered as oxygen content. The greater the gas supply, the faster the fan should rotate. For example, if the ideal gas-to-oxygen combustion ratio is 1:8, the flame can be controlled to the desired state by adjusting the gas electric regulating valve.

[0083] To further clarify, if the current gas flow rate is 8 m³ / h, then the air flow rate should be 64 m³ / h. 3 / h(8*8). At this time, the fan inverter will automatically adjust the fan speed to achieve an airflow of 64m³ / h. 3 / h; simultaneously, the flow meter will read the real-time flow rates of both gas and air. Assuming the ratio of gas to oxygen for complete combustion is 1:8, and the current real-time gas flow rate is 8m³ / h... 3 / h, then the real-time air flow rate at a 1:8 ratio should be 64m³ / h. 3 / h(8m 3 / h*8).

[0084] In summary, this invention constructs a highly integrated intelligent control system by integrating advanced sensor technology, control algorithms, and data processing technology. This system can monitor key parameters during the combustion process in real time, such as temperature, pressure, and air-fuel ratio, and intelligently analyze and adjust these data using a PID control algorithm to achieve optimal combustion performance. Simultaneously, through parameter tuning calculations, it can identify and predict abnormal situations during combustion, thereby making real-time adjustments to avoid energy waste and improve combustion efficiency. In other words, by precisely controlling the air-fuel ratio and optimizing combustion parameters, the combustion effect of the suspension kiln burner on materials is significantly improved. Furthermore, it not only ensures complete combustion of materials but also reduces pollutant emissions caused by incomplete combustion.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0087] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process. Furthermore, the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functionality involved.

[0088] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus or device (such as a computer-based system, a processor-included system or other system that can fetch and execute instructions from, an instruction execution system, apparatus or device).

[0089] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. All or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware, the program being stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiments.

[0090] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. This storage medium can be a read-only memory, a disk, or an optical disk, etc.

[0091] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An intelligent control system for a burner used in a suspension kiln, characterized in that: include: The suspension kiln acquisition module is used to collect combustion parameter information of the suspension kiln and transmit it to the PLC control system. The suspension kiln acquisition module includes a temperature transmitter, a pressure transmitter and a gas flow meter. The temperature transmitter, pressure transmitter and gas flow meter are sequentially installed in the gas inlet pipe. After the temperature transmitter, pressure transmitter and gas flow meter convert the combustion parameter information into digital signals, they are transmitted to the PLC control system. The PLC control system is connected to the suspension kiln acquisition module. It is used to obtain the real-time gas flow rate from the combustion parameter information of the suspension kiln, and based on the air-fuel ratio combustion optimization model, it generates the ratio of gas flow rate to air flow rate and generates the air-fuel ratio parameter control signal of the igniter to obtain the air flow rate value and gas flow rate for complete combustion. The burner control actuator is connected to the PLC control system and is used to respond to the ignition opening parameter signal issued by the PLC control system. During the ignition process of the burner, after receiving the ignition opening parameter signal, the burner control actuator controls the ignition opening of the pneumatic valve according to the ignition opening parameter to adjust the corresponding pneumatic valve of the burner, so as to control the flame shape and temperature of the suspension kiln burner. The combustion parameter information includes igniter parameters, purge parameters, flame detector parameters, ignition opening parameters, combustion fan parameters, air-fuel ratio parameters, flame detector status parameters, primary air fan parameters, and combustion fan parameters. The igniter parameters include cooling time and ignition time parameters. The cooling time is the time data for the igniter to cool down within a preset time threshold after ignition. The ignition time parameter is the parameter of the longest time for a single continuous ignition. The purging parameter is the time parameter for the inert gas to purge the gas in the burner during the ignition or extinguishing process; The flame detection parameter is the flame detection delay time parameter in which there is still flame output within the flame detection delay time; The ignition opening parameter is the pneumatic valve ignition opening setting parameter during automatic ignition; The combustion fan parameters are the combustion fan ignition speed ratio set parameters during automatic ignition; The air-fuel ratio parameter includes the gas flow rate and the combustion air flow rate, and is the parameter information of the ratio of the gas flow rate to the combustion air flow rate. At the same time, the combustion air blower automatically adjusts the combustion air flow rate parameter according to the gas flow rate and the air-fuel ratio parameter. The flame detection status parameters are those when the burner is in a default flame-on state. The primary air fan parameters are changed by switching the source of the primary air fan target parameters in automatic mode, and the primary air fan parameters include the primary air fan hook status. The primary air fan hook status is that the primary air fan target parameters are automatically generated by the gas flow rate. The combustion fan parameters are changed by switching the source of the target parameters of the combustion fan in automatic mode. The combustion fan parameters include the status of the combustion fan hook. The status of the combustion fan hook indicates that the target parameters of the combustion fan are automatically generated by the combustion air flow. A combustion-supporting fan, connected to the burner, is used to respond to and adjust the parameters of the combustion-supporting fan according to the air-fuel ratio parameter control signal issued by the PLC control system. A primary air fan, connected to the burner, is used to perform primary air blowing control in response to the primary air fan target parameters of the PLC control system.

2. The intelligent control system for a burner in a suspension kiln as described in claim 1, characterized in that, The pneumatic valves of the burner control actuator include a main fire valve pneumatic valve and a secondary fire valve pneumatic valve.

3. The intelligent control system for a burner in a suspension kiln as described in claim 2, characterized in that, Also includes: Emergency shut-off valves, pneumatic regulating valves, venting valves, purge valves, and main emergency valves; The emergency shut-off valve is connected to the gas flow meter, the pneumatic regulating valve is connected to the emergency shut-off valve, the main emergency valve is connected to the pneumatic regulating valve, the purge valve is connected to the inlet of the main emergency valve, the purge valve is connected to the outlet of the main emergency valve, the inlets of the large fire valve and the small fire valve are both connected to the outlet of the main emergency valve, and the outlets of the large fire valve and the small fire valve are connected to the inlet of the burner.

4. The intelligent control system for a burner in a suspension kiln as described in claim 1, characterized in that, The air-fuel ratio combustion optimization model is based on online analysis of the suspension kiln and optimized control of the air-fuel ratio. Specifically, it uses a PID control algorithm and parameter tuning calculations to achieve optimal control of the air-fuel ratio within the suspension kiln, as detailed below: In equation (1), u(t) is the control quantity of the air-fuel ratio, and k p Let T be the proportional gain, e(t) be the deviation between the controlled variable of the air-fuel ratio and the preset value, and T be the proportional gain. I Integral time constant, T D dt is the differential time constant, and dt is the differential sign; In equation (2), T is the total number of time series, α(t) is the control quantity of the simulated air-fuel ratio at the current time t, and w t The calibration parameter adjustment weighting coefficient for the simulated air-fuel ratio at the current time t; In equation (3), R t Q is the output value of the ignition opening of the PLC control system. t Let Q be the heat sample value at the current time t. t-1 F is the sampled value of the heat signal at the previous time t-1. t Let F be the sampled value of the combustion air flow rate at the current time t. t-1 This is the sampled value of the combustion air flow rate at the previous time t-1.

5. The intelligent control system for a burner in a suspension kiln as described in claim 1, characterized in that, The combustion-supporting blower is equipped with a frequency converter, and the frequency of the frequency converter is controlled by a PLC control system to adjust the blower speed, thereby completing the adjustment of the combustion-supporting airflow.

6. The intelligent control system for a burner in a suspension kiln as described in claim 1, characterized in that, The PLC control system also includes an early warning module. When the burner intelligent control system is in automatic mode and the flame detector fails to detect a flame signal, the early warning module will automatically shut down for protection, issue an alarm message and generate alarm data. At the same time, when the flame signal is unstable and the flame detector is disabled, the module will notify and arrange for manual monitoring of the flame status.

7. A method applied to an intelligent control system for a burner in a suspension kiln as described in claim 4, characterized in that, The method is an online air-fuel ratio optimization control method for suspension kilns, as detailed below: The target data of the combustion parameters of the pre-set suspension kiln are used to automatically control the size of the gas electric regulating valve through the PLC control system to ensure that the actual gas flow rate matches the target flow rate. After the gas inlet is connected and the gas volume is increased, the PLC control system obtains the real-time flow, pressure and temperature parameters of the gas through the suspension kiln acquisition module. Combined with the air-fuel ratio combustion optimization model, it analyzes and calculates the optimal combustion ratio of gas and air flow to obtain the air flow value information for complete combustion. The PLC control system generates control signals for the combustion fan and burner actuators based on the air flow rate information of fully combusted air. Air flow control is then performed after matching the control signals. Specifically, the air flow control is achieved by using target data of the combustion parameters of the pre-set suspension kiln, which is calculated through real-time gas flow rate and air-fuel ratio analysis. The PLC control system controls the ignition opening parameters to control the ignition opening of the pneumatic valve and adjusts the fan speed by controlling the frequency of the fan inverter to complete the adjustment of the combustion air flow.

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