Gas furnace control method and system suitable for multi-load working condition

Abstract

The invention discloses a gas furnace control method and system suitable for a multi-load working condition, and the method comprises the steps: collecting the real-time concentration of flue gas generated in the operation process of a gas furnace body, and determining the real-time operation load of the gas furnace body in combination with the opening degree of a gas valve; establishing a load-optimal target concentration curve, and matching the optimal target concentration corresponding to the real-time operation load according to the load-optimal target concentration curve; and dynamically adjusting the rotating speed of the smoke exhaust fan according to a comparison result of the real-time concentration and the optimal target concentration. The problem that in an existing gas furnace control scheme, a smoke exhaust fan rotating speed control mode based on a single threshold value can only adapt to a single gas furnace load working condition point and is difficult to cope with parameter dynamic changes caused by gas furnace load complex fluctuation is solved.

Description

Technical Field

[0001] This invention relates to the field of gas furnace control technology, specifically a gas furnace control method and system applicable to multiple load conditions. Background Technology

[0002] In existing gas-fired boiler control schemes, the flue gas containing the gas typically needs to be monitored in real time during boiler operation. Concentration, then compare the real-time concentration with the preset concentration. The concentration threshold is compared, and the speed of the exhaust fan of the gas furnace is adjusted according to the comparison result. However, this exhaust fan speed control method based on a single threshold can only adapt to a single gas furnace load condition point. It is difficult to cope with the dynamic changes in parameters caused by complex fluctuations in the gas furnace load, and cannot achieve accurate adaptation and stable control of the gas furnace across the entire load range. Summary of the Invention

[0003] To address the aforementioned shortcomings, this invention proposes a gas furnace control method and system applicable to multiple load conditions. The aim is to solve the problem that the existing gas furnace control scheme, which uses exhaust fan speed control based on a single threshold, can only adapt to a single gas furnace load condition and is unable to cope with the dynamic changes in parameters caused by complex fluctuations in gas furnace load.

[0004] To achieve this objective, the present invention adopts the following technical solution: A gas furnace control method applicable to multiple load conditions, the gas furnace including a gas furnace body and an exhaust fan, the gas furnace body including a gas valve, the method comprising: Step S1: Collect the real-time opening degree of the gas valve and the amount of gas in the flue gas generated during the operation of the gas furnace. Real-time concentration; Step S2: Determine the real-time operating load of the gas furnace body based on the real-time opening degree of the gas valve; Step S3: Establish load-optimal target Concentration curve; Step S4: Based on load-optimal target Concentration curves are used to find and obtain the optimal target corresponding to the real-time operating load of the gas furnace body. concentration; Step S5: Remove the flue gas generated during the operation of the gas furnace body... The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The concentrations were compared, and the speed of the exhaust fan was dynamically adjusted based on the comparison results to ensure that the concentrations of certain substances in the flue gas generated during the operation of the gas furnace were controlled. The real-time concentration approaches the optimal target corresponding to the real-time operating load of the gas furnace body. concentration.

[0005] Preferably, step S2 specifically includes the following sub-steps: Step S21: Obtain the rated load of the gas furnace body; Step S22: Based on the rated load of the gas furnace body and the real-time opening degree of the gas valve, calculate the real-time operating load of the gas furnace body. The specific calculation formula is as follows: ; in, This indicates the real-time operating load of the gas-fired boiler body; Indicates the rated load of the gas furnace body; This indicates the real-time opening degree of the gas valve.

[0006] Preferably, in step S3, the load-optimal target The specific mathematical expression for the concentration curve is as follows: ; Where y represents the optimal objective. Concentration; x represents the operating load of the gas furnace body.

[0007] Preferably, step S5 specifically includes the following sub-steps: Step S51: Calculate the amount of gas in the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The deviation value d between concentrations; Step S52: Adjust the corresponding exhaust fan speed according to the deviation value d; When d is greater than the first preset threshold, the speed of the exhaust fan is adjusted to 200 rpm / min; when d is greater than the second preset threshold and less than or equal to the first preset threshold, the speed of the exhaust fan is adjusted to 100 rpm / min; when d is greater than the third preset threshold and less than or equal to the second preset threshold, the speed of the exhaust fan is adjusted to 50 rpm / min; when d is less than the fourth preset threshold, the current speed of the exhaust fan remains unchanged.

[0008] Another aspect of this application provides a gas furnace control system suitable for multi-load operating conditions, the system comprising: The data acquisition module is used to collect the real-time opening degree of the gas valve and the amount of gas in the flue gas generated during the operation of the gas furnace. Real-time concentration; The determination module is used to determine the real-time operating load of the gas furnace body based on the real-time opening degree of the gas valve. Establishment module for establishing load-optimal target Concentration curve; The acquisition module is used to determine the load-optimal target. Concentration curves are used to find and obtain the optimal target corresponding to the real-time operating load of the gas furnace body. concentration; The comparison module is used to compare the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. Compare concentrations; The adjustment module is used to dynamically adjust the speed of the exhaust fan based on the comparison results, so that the exhaust gas generated during the operation of the gas furnace body contains... The real-time concentration approaches the optimal target corresponding to the real-time operating load of the gas furnace body. concentration.

[0009] Preferably, the determining module includes: The acquisition submodule is used to acquire the rated load of the gas furnace body; The first calculation submodule is used to calculate the real-time operating load of the gas furnace body based on the rated load of the gas furnace body and the real-time opening degree of the gas valve. The specific calculation formula is as follows: ; in, This indicates the real-time operating load of the gas-fired boiler body; Indicates the rated load of the gas furnace body; This indicates the real-time opening degree of the gas valve.

[0010] Preferably, in the establishment module, the load-optimal target The specific mathematical expression for the concentration curve is as follows: ; Where y represents the optimal objective. Concentration; x represents the operating load of the gas furnace body.

[0011] Preferably, the comparison module includes: The second calculation submodule is used to calculate the content of the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The deviation value d between concentrations; The adjustment module includes: The first adjustment submodule is used to adjust the speed of the exhaust fan to 200 rpm / min when d is greater than the first preset threshold. The second adjustment submodule is used to adjust the speed of the exhaust fan to 100 rpm / min when d is greater than the second preset threshold and less than or equal to the first preset threshold. The third adjustment submodule is used to adjust the speed of the exhaust fan to 50 rpm / min when d is greater than the third preset threshold and less than or equal to the second preset threshold. The fourth adjustment submodule is used to keep the current speed of the exhaust fan unchanged when d is less than the fourth preset threshold.

[0012] The technical solution provided by this invention may include the following beneficial effects: This solution first collects data from the flue gas generated during the operation of the gas furnace. The real-time concentration, combined with the gas valve opening, determines the real-time operating load of the gas furnace body, and then establishes a load-optimal target. Concentration curves are used to match the optimal target corresponding to the real-time operating load. Concentration, finally based on Real-time concentration and the optimal target The concentration comparison results dynamically adjust the speed of the exhaust fan, achieving precise control of the gas boiler. Compared to exhaust fan speed control methods based on a single threshold, this scheme establishes a load-optimal target... The concentration curve represents a unique optimal target for each load condition of the gas-fired boiler. Concentration effectively breaks the limitation that a single threshold can only adapt to a single load, achieving precise adaptation and stable control of the gas furnace across the entire load range. Attached Figure Description

[0013] Figure 1 This is a flowchart of a gas furnace control method applicable to multiple load conditions. Detailed Implementation

[0014] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0015] A gas furnace control method applicable to multiple load conditions, the gas furnace including a gas furnace body and an exhaust fan, the gas furnace body including a gas valve, the method comprising: Step S1: Collect the real-time opening degree of the gas valve and the amount of gas in the flue gas generated during the operation of the gas furnace. Real-time concentration; Step S2: Determine the real-time operating load of the gas furnace body based on the real-time opening degree of the gas valve; Step S3: Establish load-optimal target Concentration curve; Step S4: Based on load-optimal target Concentration curves are used to find and obtain the optimal target corresponding to the real-time operating load of the gas furnace body. concentration; Step S5: Remove the flue gas generated during the operation of the gas furnace body... The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The concentrations were compared, and the speed of the exhaust fan was dynamically adjusted based on the comparison results to ensure that the concentrations of certain substances in the flue gas generated during the operation of the gas furnace were controlled. The real-time concentration approaches the optimal target corresponding to the real-time operating load of the gas furnace body. concentration.

[0016] This solution provides a gas furnace control method applicable to multiple load conditions, such as... Figure 1 As shown, the first step is to collect the real-time opening degree of the gas valve and the amount of gas in the flue gas generated during the operation of the gas furnace. In this embodiment, the gas valve opening is a direct indicator of the gas supply to the gas furnace, and the concentration in the flue gas generated during the operation of the gas furnace is [data missing]. Concentration is a key parameter reflecting the completeness of combustion in a gas-fired boiler. It is obtained by collecting data on the real-time opening of the gas valve and the concentration of [unclear - possibly referring to concentration in the flue gas] generated during the operation of the boiler. Real-time concentration provides a reliable data foundation for subsequent load determination, target matching, and discharge fan speed adjustment. The second step is to determine the real-time operating load of the gas furnace body based on the real-time opening degree of the gas valve. In this embodiment, since the gas valve opening degree is positively correlated with the gas supply, and the gas supply directly determines the heating or heating capacity of the gas furnace, i.e., the operating load, the real-time operating load of the gas furnace body can be accurately determined by the real-time opening degree of the gas valve. The third step is to establish a load-optimal target. In this embodiment, the concentration curve is established by setting a load-optimal target. The concentration curve matches a unique optimal target for each load condition of the gas-fired boiler. Concentration. Further explanation: this load-optimal target... The concentration curve is derived based on a large amount of experimental data and rigorous theoretical calculations. Its core principle is to accurately select specific concentration curves for each specific load condition. Concentration value, which strictly ensures that the flue gas contains The concentration is below the safety limit, ensuring the safety and compliance of the gas-fired boiler operation; it also maximizes the overall thermal efficiency of the gas-fired boiler, achieving efficient energy utilization. Therefore, this load is the optimal target. The concentration curve essentially defines the optimal balance between operational safety and combustion efficiency of a gas-fired boiler under different load conditions. The fourth step is based on the load-optimal target... Concentration curves are used to find and obtain the optimal target corresponding to the real-time operating load of the gas furnace body. In this embodiment, the concentration is determined by the real-time operating load of the gas furnace body from the load to the optimal target. Locate the corresponding optimal target in the concentration curve Concentration not only ensures real-time operating load and optimal target The concentration is perfectly matched, and no additional complex calculations and judgment logic are required, effectively reducing the computational burden on the gas furnace control processor and thus improving control response speed. The fifth step is to analyze the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The concentrations were compared, and the speed of the exhaust fan was dynamically adjusted based on the comparison results to ensure that the concentrations of certain substances in the flue gas generated during the operation of the gas furnace were controlled. The real-time concentration approaches the optimal target corresponding to the real-time operating load of the gas furnace body. Concentration, in this embodiment, is determined by... Real-time concentration and optimal target The concentration comparison results dynamically adjust the speed of the exhaust fan, so that... Real-time concentration tends towards the optimal target The concentration ensures that the gas furnace is always in the ideal combustion state of "optimal air-fuel ratio", maximizing the utilization rate of gas and achieving efficient and energy-saving operation.

[0017] This solution first collects data from the flue gas generated during the operation of the gas furnace. The real-time concentration, combined with the gas valve opening, determines the real-time operating load of the gas furnace body, and then establishes a load-optimal target. Concentration curves are used to match the optimal target corresponding to the real-time operating load. Concentration, finally based on Real-time concentration and the optimal target The concentration comparison results dynamically adjust the speed of the exhaust fan, achieving precise control of the gas boiler. Compared to exhaust fan speed control methods based on a single threshold, this scheme establishes a load-optimal target... The concentration curve represents a unique optimal target for each load condition of the gas-fired boiler. Concentration effectively breaks the limitation that a single threshold can only adapt to a single load, achieving precise adaptation and stable control of the gas furnace across the entire load range.

[0018] Preferably, step S2 specifically includes the following sub-steps: Step S21: Obtain the rated load of the gas furnace body; Step S22: Based on the rated load of the gas furnace body and the real-time opening degree of the gas valve, calculate the real-time operating load of the gas furnace body. The specific calculation formula is as follows: ; in, This indicates the real-time operating load of the gas-fired boiler body; Indicates the rated load of the gas furnace body; This indicates the real-time opening degree of the gas valve.

[0019] In this embodiment, in step S21, the rated load of the gas furnace body is obtained to provide an accurate benchmark for the subsequent calculation of the real-time operating load. In step S22, the real-time operating load of the gas furnace body is calculated based on the rated load of the gas furnace body and the real-time opening degree of the gas valve, which not only provides a basis for subsequent control... The concentration provides a reliable parameter basis, and this calculation method can be achieved solely based on the opening signal of the gas valve, without the need for additional sensors, thereby reducing hardware costs.

[0020] Preferably, in step S3, the load-optimal target The specific mathematical expression for the concentration curve is as follows: ; Where y represents the optimal objective. Concentration; x represents the operating load of the gas furnace body.

[0021] In this embodiment, due to the load-optimal target The mathematical expression for the concentration curve is " This allows the gas furnace to automatically adjust to the optimal operating load range of 0.07 to 1.92. Concentration, to avoid low load Too low a concentration should also be avoided during high loads. The concentration is too high, covering the combustion optimization requirements under complex load conditions. Further explanation is needed, through analysis of the mathematical expression: "load - optimal target" The concentration curve, the peak of which corresponds to an operating load of 0.96, The operating point with a concentration of 0.09" represents a balance between combustion efficiency and emissions. In other embodiments, the load-optimal target... The mathematical expression for the concentration curve can be adaptively adjusted and configured according to the specific parameters of different gas furnace systems.

[0022] Preferably, step S5 specifically includes the following sub-steps: Step S51: Calculate the amount of gas in the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The deviation value d between concentrations; Step S52: Adjust the corresponding exhaust fan speed according to the deviation value d; When d is greater than the first preset threshold, the speed of the exhaust fan is adjusted to 200 rpm / min; when d is greater than the second preset threshold and less than or equal to the first preset threshold, the speed of the exhaust fan is adjusted to 100 rpm / min; when d is greater than the third preset threshold and less than or equal to the second preset threshold, the speed of the exhaust fan is adjusted to 50 rpm / min; when d is less than the fourth preset threshold, the current speed of the exhaust fan remains unchanged.

[0023] In this embodiment, in step S51, the amount of gas in the flue gas generated during the operation of the gas furnace body is calculated. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The deviation value d between concentrations provides a reliable benchmark for subsequent adjustment of the exhaust fan speed. In step S52, the first preset threshold is set to 5%, the second preset threshold is set to 3%, the third preset threshold is set to 1%, and the fourth preset threshold is set to 0.5%. By setting graded speed adjustment rules for different deviation values, it is possible to ensure rapid correction of concentration when there is a large deviation, while avoiding fluctuations in the gas furnace system caused by over-adjustment when there is a small deviation.

[0024] Another aspect of this application provides a gas furnace control system suitable for multi-load operating conditions, the system comprising: The data acquisition module is used to collect the real-time opening degree of the gas valve and the amount of gas in the flue gas generated during the operation of the gas furnace. Real-time concentration; The determination module is used to determine the real-time operating load of the gas furnace body based on the real-time opening degree of the gas valve. Establishment module for establishing load-optimal target Concentration curve; The acquisition module is used to determine the load-optimal target. Concentration curves are used to find and obtain the optimal target corresponding to the real-time operating load of the gas furnace body. concentration; The comparison module is used to compare the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. Compare concentrations; The adjustment module is used to dynamically adjust the speed of the exhaust fan based on the comparison results, so that the exhaust gas generated during the operation of the gas furnace body contains... The real-time concentration approaches the optimal target corresponding to the real-time operating load of the gas furnace body. concentration.

[0025] This solution presents a gas boiler control system suitable for multiple load conditions. Through the coordinated operation of acquisition, determination, establishment, acquisition, comparison, and adjustment modules, it achieves precise control of the gas boiler. Compared to exhaust fan speed control based on a single threshold, this solution establishes a load-optimal target... The concentration curve represents a unique optimal target for each load condition of the gas-fired boiler. Concentration effectively breaks the limitation that a single threshold can only adapt to a single load, achieving precise adaptation and stable control of the gas furnace across the entire load range.

[0026] Preferably, the determining module includes: The acquisition submodule is used to acquire the rated load of the gas furnace body; The first calculation submodule is used to calculate the real-time operating load of the gas furnace body based on the rated load of the gas furnace body and the real-time opening degree of the gas valve. The specific calculation formula is as follows: ; in, This indicates the real-time operating load of the gas-fired boiler body; Indicates the rated load of the gas furnace body; This indicates the real-time opening degree of the gas valve.

[0027] In this embodiment, by setting up an acquisition submodule, an accurate benchmark is provided for subsequent real-time load calculations. By setting up a first calculation submodule, not only can subsequent control... The concentration provides a reliable parameter, and it can be achieved solely based on the opening signal of the gas valve, without the need for additional sensors, thus reducing hardware costs.

[0028] Preferably, in the establishment module, the load-optimal target The specific mathematical expression for the concentration curve is as follows: ; Where y represents the optimal objective. Concentration; x represents the operating load of the gas furnace body.

[0029] In this embodiment, in the establishment module, due to the load-optimal target The mathematical expression for the concentration curve is " This allows the gas furnace to automatically adjust to the optimal operating load range of 0.07 to 1.92. Concentration, to avoid low load Too low a concentration should also be avoided during high loads. The concentration is too high, which covers the combustion optimization requirements under complex load conditions.

[0030] Preferably, the comparison module includes: The second calculation submodule is used to calculate the content of the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The deviation value d between concentrations; The adjustment module includes: The first adjustment submodule is used to adjust the speed of the exhaust fan to 200 rpm / min when d is greater than the first preset threshold. The second adjustment submodule is used to adjust the speed of the exhaust fan to 100 rpm / min when d is greater than the second preset threshold and less than or equal to the first preset threshold. The third adjustment submodule is used to adjust the speed of the exhaust fan to 50 rpm / min when d is greater than the third preset threshold and less than or equal to the second preset threshold. The fourth adjustment submodule is used to keep the current speed of the exhaust fan unchanged when d is less than the fourth preset threshold.

[0031] In this embodiment, a second calculation submodule is provided to offer a reliable benchmark for subsequent adjustments to the exhaust fan speed. By setting up a first, second, third, and fourth adjustment submodule, the system can quickly correct concentrations when there are large deviations, while avoiding fluctuations in the gas furnace system caused by over-adjustment when there are small deviations.

[0032] Furthermore, the functional units in the various embodiments of the present invention 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.

[0033] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for a gas-fired furnace suitable for multiple load conditions, the gas-fired furnace comprising a furnace body and an exhaust fan, the furnace body comprising a gas valve, characterized in that: The method includes: Step S1: Collect the real-time opening degree of the gas valve and the amount of gas in the flue gas generated during the operation of the gas furnace. Real-time concentration; Step S2: Determine the real-time operating load of the gas furnace body based on the real-time opening degree of the gas valve; Step S3: Establish load-optimal target Concentration curve; Step S4: Based on load-optimal target Concentration curves are used to find and obtain the optimal target corresponding to the real-time operating load of the gas furnace body. concentration; Step S5: Remove the flue gas generated during the operation of the gas furnace body... The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The concentrations were compared, and the speed of the exhaust fan was dynamically adjusted based on the comparison results to ensure that the concentrations of certain substances in the flue gas generated during the operation of the gas furnace were controlled. The real-time concentration approaches the optimal target corresponding to the real-time operating load of the gas furnace body. concentration.

2. The gas furnace control method applicable to multi-load conditions according to claim 1, characterized in that: Step S2 specifically includes the following sub-steps: Step S21: Obtain the rated load of the gas furnace body; Step S22: Based on the rated load of the gas furnace body and the real-time opening degree of the gas valve, calculate the real-time operating load of the gas furnace body. The specific calculation formula is as follows: ； in, This indicates the real-time operating load of the gas-fired boiler body; Indicates the rated load of the gas furnace body; This indicates the real-time opening degree of the gas valve.

3. The gas furnace control method applicable to multi-load conditions according to claim 1, characterized in that: In step S3, load-optimal target The specific mathematical expression for the concentration curve is as follows: ； Where y represents the optimal objective. Concentration; x represents the operating load of the gas furnace body.

4. The gas furnace control method applicable to multiple load conditions according to claim 1, characterized in that: Step S5 specifically includes the following sub-steps: Step S51: Calculate the amount of gas in the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The deviation value d between concentrations; Step S52: Adjust the corresponding exhaust fan speed according to the deviation value d; When d is greater than the first preset threshold, the speed of the exhaust fan is adjusted to 200 rpm / min; when d is greater than the second preset threshold and less than or equal to the first preset threshold, the speed of the exhaust fan is adjusted to 100 rpm / min; when d is greater than the third preset threshold and less than or equal to the second preset threshold, the speed of the exhaust fan is adjusted to 50 rpm / min; when d is less than the fourth preset threshold, the current speed of the exhaust fan remains unchanged.

5. A gas furnace control system suitable for multi-load operating conditions, using the gas furnace control method suitable for multi-load operating conditions as described in any one of claims 1-4, characterized in that: The system includes: The data acquisition module is used to collect the real-time opening degree of the gas valve and the amount of gas in the flue gas generated during the operation of the gas furnace. Real-time concentration; The determination module is used to determine the real-time operating load of the gas furnace body based on the real-time opening degree of the gas valve. Establishment module for establishing load-optimal target Concentration curve; The acquisition module is used to determine the load-optimal target. Concentration curves are used to find and obtain the optimal target corresponding to the real-time operating load of the gas furnace body. concentration; The comparison module is used to compare the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. Compare concentrations; The adjustment module is used to dynamically adjust the speed of the exhaust fan based on the comparison results, so that the exhaust gas generated during the operation of the gas furnace body contains... The real-time concentration approaches the optimal target corresponding to the real-time operating load of the gas furnace body. concentration.

6. A gas-fired boiler control system suitable for multi-load conditions according to claim 5, characterized in that: The determining module includes: The acquisition submodule is used to acquire the rated load of the gas furnace body; The first calculation submodule is used to calculate the real-time operating load of the gas furnace body based on the rated load of the gas furnace body and the real-time opening degree of the gas valve. The specific calculation formula is as follows: ； in, This indicates the real-time operating load of the gas-fired boiler body; Indicates the rated load of the gas furnace body; This indicates the real-time opening degree of the gas valve.

7. A gas-fired boiler control system suitable for multi-load conditions according to claim 5, characterized in that: In the establishment module, load-optimal target The specific mathematical expression for the concentration curve is as follows: ； Where y represents the optimal objective. Concentration; x represents the operating load of the gas furnace body.

8. A gas furnace control system suitable for multi-load operating conditions according to claim 5, characterized in that: The comparison module includes: The second calculation submodule is used to calculate the content of the flue gas generated during the operation of the gas furnace. The optimal target corresponding to the real-time concentration and the real-time operating load of the gas furnace body. The deviation value d between concentrations; The adjustment module includes: The first adjustment submodule is used to adjust the speed of the exhaust fan to 200 rpm / min when d is greater than the first preset threshold. The second adjustment submodule is used to adjust the speed of the exhaust fan to 100 rpm / min when d is greater than the second preset threshold and less than or equal to the first preset threshold. The third adjustment submodule is used to adjust the speed of the exhaust fan to 50 rpm / min when d is greater than the third preset threshold and less than or equal to the second preset threshold. The fourth adjustment submodule is used to keep the current speed of the exhaust fan unchanged when d is less than the fourth preset threshold.

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