Full-premixing type gas heating stove control method and related equipment

Abstract

The invention discloses a full premixing type gas heating stove control method and related equipment, and the method comprises the steps that the maximum correction coefficient delta Pmax corresponding to the maximum fan rotating speed and the minimum correction coefficient delta Pmin corresponding to the minimum fan rotating speed are obtained, and the correction coefficients are the difference value of air pressure and gas pressure; when the gas heating furnace operates at the maximum fan rotating speed under the condition of the maximum correction coefficient delta Pmax and operates at the minimum fan rotating speed under the condition of the minimum correction coefficient delta Pmin, the oxygen content of the flue gas is within the preset oxygen content standard range; fitting according to the parameters to obtain a relation function of the fan rotating speed and the correction coefficient; the real-time fan rotating speed only needs to be determined, the real-time fan rotating speed is substituted into the relation function to obtain the corresponding correction coefficient, the opening degree of the gas proportional valve is adjusted, and the difference value between the air pressure and the gas pressure is the correction coefficient corresponding to the real-time fan rotating speed. The opening degree of the gas proportional valve is adjusted according to the correction coefficient, so that the quality of smoke can meet the smoke standard, and the whole debugging process is simple and rapid.

Description

Technical Field

[0001] The present invention relates to the technical field of gas heating, and in particular to a control method for a full premixed gas heating furnace and related equipment. Background Art

[0002] The operation mode of the fully premixed gas heating furnace is: the air and gas are fully mixed before entering the combustion chamber for combustion. There is no secondary air involved in the combustion process. It has the advantages of full combustion, high thermal efficiency and low harmful smoke emissions.

[0003] At present, the gas proportional valve in the fully prefabricated gas heating furnace in the domestic market is a pneumatic proportional valve. The opening of the pneumatic proportional valve depends on the negative pressure generated by the fan, that is, the pneumatic proportional valve is controlled by a mechanical mechanism. In order to make the oxygen content of the flue gas obtained after the combustion of the mixed gas meet the standard, the pneumatic proportional valve needs to be debugged with a flue gas analyzer before the machine leaves the factory. Not only is the debugging time long, but the debugging process is also relatively complicated. Summary of the Invention

[0004] The present invention provides a control method for a full premix gas heating furnace, which solves the problem of long debugging time and complicated debugging process when debugging a pneumatic proportional valve of the full premix gas heating furnace according to flue gas standards.

[0005] In a first aspect, the present invention provides a control method for a fully premixed gas heating furnace, wherein the premixer of the gas heating furnace includes an air inlet and a gas inlet, and the method comprises:

[0006] Get the maximum correction coefficient ΔP corresponding to the maximum fan speed max The minimum correction coefficient ΔP corresponding to the minimum fan speed min Wherein, the correction coefficient is the difference between the air pressure at the air inlet and the gas pressure at the gas inlet, and the gas heating furnace is at the maximum correction coefficient ΔP max When the fan is running at the maximum speed and at the minimum correction factor ΔP min When the fan is running at the minimum speed under the following conditions, the oxygen content of the flue gas from the mixed combustion of air and gas is within the preset oxygen content standard range;

[0007] According to the maximum fan speed, the maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Perform function fitting to obtain the relationship function between the fan speed and the correction coefficient;

[0008] Obtaining a real-time fan speed, and substituting the real-time fan speed into the relationship function to obtain a correction coefficient corresponding to the real-time fan speed;

[0009] The opening of the gas proportional valve is adjusted so that the difference between the air pressure and the gas pressure becomes the correction coefficient corresponding to the real-time fan speed.

[0010] The full premix gas heating furnace control method provided by the embodiment of the present invention has the following beneficial effects:

[0011] Maximum fan speed and maximum correction factor ΔP max , minimum fan speed and minimum correction factor ΔP min They both reflect the correlation between the correction coefficient and the fan speed (positively correlated with the combustion load), so the relationship function between the correction coefficient and the fan speed can be fitted based on the above two pairs of known parameters, and the maximum fan speed and the minimum fan speed are the limit values of the fan speed, then the fitted relationship function can cover the correlation between other fan speeds and the correction coefficient between the limit values; both pairs of known parameters have the characteristic that the flue gas quality meets the flue gas standard, then other data points in the fitted relationship function also have the characteristic that the flue gas quality meets the flue gas standard, on the basis of obtaining the relationship function, in actual application, it is only necessary to determine the real-time fan speed, then the correction coefficient corresponding to the real-time fan speed can be obtained according to the relationship function, and the opening of the gas proportional valve can be adjusted according to the correction coefficient, that is, the quality of the flue gas when the gas heating furnace runs at the real-time fan speed under the correction coefficient condition can meet the flue gas standard, and the whole debugging process is simple and fast.

[0012] In a second aspect, the present invention provides a fully premixed gas heating furnace, wherein the premixer of the gas heating furnace includes an air inlet and a gas inlet, and the gas heating furnace includes a main controller, wherein the main controller includes:

[0013] Parameter acquisition module, used to obtain the maximum correction coefficient ΔP corresponding to the maximum fan speed max The minimum correction coefficient ΔP corresponding to the minimum fan speed min Wherein, the correction coefficient is the difference between the air pressure at the air inlet and the gas pressure at the gas inlet, and the gas heating furnace is at the maximum correction coefficient ΔP max When the fan is running at the maximum speed and at the minimum correction factor ΔP min When the fan is running at the minimum speed under the following conditions, the oxygen content of the flue gas from the mixed combustion of air and gas is within the preset oxygen content standard range;

[0014] Function fitting module, used for according to the maximum fan speed, maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Perform function fitting to obtain the relationship function between the fan speed and the correction coefficient;

[0015] a correction coefficient calculation module, configured to obtain a real-time fan speed, and substitute the real-time fan speed into the relationship function to obtain a correction coefficient corresponding to the real-time fan speed;

[0016] The proportional valve adjustment module is used to adjust the opening of the gas proportional valve so that the difference between the air pressure and the gas pressure becomes the correction coefficient corresponding to the real-time fan speed.

[0017] In a third aspect, the present invention provides an electronic device, comprising:

[0018] at least one processor; and

[0019] a memory communicatively connected to the at least one processor; wherein,

[0020] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the full premix gas heating furnace control method described in the first aspect of the present invention.

[0021] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer instructions, which are used to enable a processor to implement the full-premix gas heating furnace control method described in the first aspect of the present invention when executed.

[0022] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a structural diagram of a full premix gas heating furnace provided by an embodiment of the present invention;

[0025] Figure 2 This is a flow chart of a method for controlling a full premixed gas heating furnace provided by an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of a fitting curve corresponding to a relationship function provided by an embodiment of the present invention;

[0027] Figure 4is a parabolic function curve corresponding to different ρ values provided by an embodiment of the present invention;

[0028] Figure 5 This is a schematic structural diagram of a main controller in a full premix gas heating furnace provided by an embodiment of the present invention;

[0029] Figure 6 It is a structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0031] An embodiment of the present invention provides a method for controlling a fully premixed gas heating furnace. This embodiment is applicable to the control of a fully premixed gas heating furnace. The method can be executed by a main controller in the control of the fully premixed gas heating furnace. The main controller can be implemented in the form of hardware and / or software, and the main controller can be configured in an electronic device.

[0032] Figure 1 This is a structural diagram of a gas heating furnace, which includes a main heat exchanger 1, a burner 2, an air pressure pipe 4, a premixer 4, a gas pressure pipe 5, a wind pressure sensor 6, a mixing pipe 7, an expansion water tank 8, a premixing fan 9, a gas inlet pipe 10, and a gas proportional valve 11. The premixer 4 includes an air inlet and a gas inlet. One end of the air pressure pipe 4 is connected to the air inlet, and the other end is connected to the wind pressure sensor 6. One end of the gas pressure pipe 5 is connected to the gas inlet, and the other end is connected to the wind pressure sensor 6. The wind pressure sensor 6 can then obtain the air pressure P at the air inlet. Air and the gas pressure P at the gas inlet Gas The difference is sent to the main control board of the gas heating furnace. Figure 1 Among them, A is the condensate outlet, B is the heating outlet, C is the bathroom outlet, D is the gas inlet, E is the bathroom inlet, and F is the heating return outlet.

[0033] Working process of gas heating furnace: When the full premix heating furnace is working, the premix fan 9 is started, so that the air inlet of the premixer 4 generates a certain negative pressure P Air (i.e. air pressure), part of the air enters the premixer 4, and the opening of the gas proportional valve 11 is adjusted according to the size of the wind pressure, so that a certain negative pressure P is generated at the gas inlet of the premixer 4.Gas (i.e. gas pressure), so that the corresponding volume of gas enters the premixer 4, and the air and gas are fully mixed through the premixer 4 and the premixing fan 9 impeller, and are then input into the burner 2 for combustion through the mixing pipe 7.

[0034] Under ideal conditions, as long as the diameter of the air inlet and the diameter of the gas nozzle remain unchanged, the air pressure P Air Equal to the gas pressure P Gas , the mixing ratio of air and gas remains unchanged, so it is only necessary to determine the diameter of the air port and the diameter of the gas port to ensure the correct air-fuel ratio. However, in actual application, the present invention takes into account the influence of deviation factors such as fan and intake resistance. In different load sections, even if P Air =P Gas , the flue gas quality will also be different. Overall, under the condition of meeting the flue gas quality requirements, in the small load section, P Air ≈P Gas , but as the load section increases (i.e. the fan speed increases), P Air and P Gas will increase simultaneously, but P Air The rate of increase will be less than P Gas Therefore, P is corrected by matching different correction coefficients ΔP in different load sections. Air The error is adjusted, and the gas proportional valve opening is adjusted so that P Air =P Gas +ΔP, in order to ensure that the oxygen content of the flue gas corresponding to different load sections meets the standard. Therefore, the above-mentioned purpose is achieved through the control method of the full premix gas heating furnace of the present invention.

[0035] Figure 2 A flow chart of a method for controlling a fully premixed gas heating furnace is provided in an embodiment of the present invention. Figure 2 As shown, the full premix gas heating furnace control method includes:

[0036] S201, obtaining the maximum correction coefficient ΔP corresponding to the maximum fan speed max The minimum correction coefficient ΔP corresponding to the minimum fan speed min .

[0037] Among them, the correction coefficient is the difference between the air pressure at the air inlet and the gas pressure at the gas inlet. The gas heating furnace has a maximum correction coefficient ΔP max When the fan is running at the maximum speed and at the minimum correction factor ΔP min When the fan is running at the minimum speed under the same conditions, the oxygen content of the flue gas from the mixed combustion of air and gas is within the preset oxygen content standard range. Among them, the fan speed is positively correlated with the combustion load.

[0038] Maximum correction coefficient ΔP max and the minimum correction coefficient ΔP min Can be obtained during the debugging process, the specific ΔP max and ΔP min The acquisition steps are:

[0039] (1) Determine the diameter of the air inlet and the gas nozzle.

[0040] Changes in the diameter of the air inlet will cause changes in air pressure, and changes in the diameter of the gas nozzle will cause changes in gas pressure. Therefore, it is necessary to first determine the diameters of the air inlet and the gas nozzle.

[0041] (2) After the burner is ignited, adjust the gas heating furnace to the maximum fan speed S max (corresponding to the maximum combustion load), adjust the opening of the gas proportioning valve, and then adjust the gas premix ratio to make the oxygen content of the flue gas reach the optimal level (within the preset oxygen content range).

[0042] For example, ΔP is set to a value, and then the gas heating furnace is adjusted to the maximum fan speed S max If the oxygen content is too low, increase ΔP; if the oxygen content is too high, decrease ΔP.

[0043] (3) Record the wind pressure of the wind pressure sensor at this time (i.e., the air pressure P Air With gas pressure P Gas The difference between the fan speed and the maximum fan speed is ΔP max .

[0044] (4) Adjust the gas heating furnace to the minimum load speed S min (corresponding to the minimum combustion load), adjust the opening of the gas proportioning valve, and then adjust the gas premix ratio to achieve the best flue gas quality.

[0045] (5) Record the wind pressure of the wind pressure sensor at this time, which is ΔP at the minimum fan speed. min .

[0046] Two control parameters are reserved in the main controller of the gas heating furnace: the maximum correction coefficient ΔP at the maximum fan speed max and the minimum correction factor ΔP at the minimum fan speed min ,After obtaining the specific values, these two parameters can be set through the ,control panel.

[0047] S202, based on the maximum fan speed and the maximum correction coefficient ΔP max , minimum fan speed and minimum correction factor ΔP min Function fitting is performed to obtain the relationship function between the fan speed and the correction coefficient.

[0048] The relationship function between fan speed and correction coefficient is a function with fan speed as independent variable and correction function as dependent variable. Specifically, the relationship function can be obtained by curve fitting. The maximum fan speed and the maximum correction coefficient ΔP max , minimum fan speed and minimum correction factor ΔP min For two points in the curve, the curve is fitted by combining the expressions of a linear function, a quadratic function or other multi-time function to obtain the relationship function between the fan speed and the correction coefficient.

[0049] Maximum fan speed, maximum correction factor ΔP max , minimum fan speed and minimum correction factor ΔP min Both pairs of known parameters have the characteristic that the oxygen content of the flue gas is within a preset oxygen content range, and each data point in the fitted relationship function also has the characteristic that the oxygen content of the flue gas is within the preset oxygen content range.

[0050] S203 , obtaining a real-time fan speed, and substituting the real-time fan speed into the relationship function to obtain a correction coefficient corresponding to the real-time fan speed.

[0051] The relationship function is a function with the fan speed as the independent variable and the correction function as the dependent variable. When the real-time fan speed is known, the correction coefficient corresponding to the real-time fan speed can be quickly calculated.

[0052] S204: Adjust the opening of the gas proportional valve so that the difference between the air pressure and the gas pressure becomes a correction coefficient corresponding to the real-time fan speed.

[0053] The correction coefficient is the difference between the air pressure and the gas pressure. When the fan speed of the premixing fan is constant, the air pressure is constant. Therefore, it is only necessary to adjust the opening of the gas proportional valve to adjust the gas pressure so that the difference between the air pressure and the gas pressure is the correction coefficient corresponding to the real-time fan speed.

[0054] Each data point in the relationship function has the characteristic that the oxygen content of the flue gas is within the preset oxygen content range, so the real-time fan speed and the correction coefficient calculated according to the relationship function also have the characteristic that the oxygen content of the flue gas is within the preset oxygen content range. The opening of the gas proportional valve is adjusted according to the correction coefficient, so that the quality of the flue gas can meet the flue gas standard when the gas heating furnace operates at the real-time fan speed under the correction coefficient condition.

[0055] In actual application scenarios, the main control panel of the gas heating furnace determines the combustion load based on the user-set hot water temperature or heating environment temperature and other requirements, and then determines the corresponding fan speed based on the combustion load, controls the premixing fan to rotate at the fan speed, and calculates the corresponding correction coefficient based on the corresponding relationship function, and then adjusts the opening of the gas proportional valve. At the same time, the wind pressure sensor is used to monitor whether the wind pressure ΔP (the difference between the air pressure and the gas pressure) is the correction coefficient. When ΔP is the correction coefficient corresponding to the fan speed, it is determined that the adjustment is completed.

[0056] The full premix gas heating furnace control method provided by the embodiment of the present invention has the following beneficial effects:

[0057] Maximum fan speed and maximum correction factor ΔP max , minimum fan speed and minimum correction factor ΔP min They both reflect the correlation between the correction coefficient and the fan speed (positively correlated with the combustion load), so the relationship function between the correction coefficient and the fan speed can be fitted based on the above two pairs of known parameters, and the maximum fan speed and the minimum fan speed are the limit values of the fan speed, then the fitted relationship function can cover the correlation between other fan speeds and the correction coefficient between the limit values; both pairs of known parameters have the characteristic that the flue gas quality meets the flue gas standard, then other data points in the fitted relationship function also have the characteristic that the flue gas quality meets the flue gas standard, on the basis of obtaining the relationship function, in actual application, it is only necessary to determine the real-time fan speed, then the correction coefficient corresponding to the real-time fan speed can be obtained according to the relationship function, and the opening of the gas proportional valve can be adjusted according to the correction coefficient, that is, the quality of the flue gas when the gas heating furnace runs at the real-time fan speed under the correction coefficient condition can meet the flue gas standard, and the whole debugging process is simple and fast.

[0058] In an optional embodiment, according to the maximum fan speed, the maximum correction coefficient ΔP max , minimum fan speed and minimum correction factor ΔP min Perform function fitting to obtain the relationship function between the fan speed and the correction coefficient, including:

[0059] Construct a linear function expression with the fan speed as the independent variable and the correction coefficient as the dependent variable;

[0060] The maximum fan speed and the maximum correction coefficient ΔP max , minimum fan speed and minimum correction factor ΔP min Substituting into the linear function expression, we can obtain the relationship function between the fan speed and the correction coefficient.

[0061] Optionally, a function expression is:

[0062]

[0063] Where ΔP is the correction coefficient, S tgt is the fan speed, S max 、S min are the maximum fan speed and the minimum fan speed respectively, ΔP max , ΔP min are the maximum correction factor and the minimum correction factor respectively.

[0064] That is, the above two pairs of parameters are used as two points on the curve, and the functional relationship is simply fitted into a linear function (i.e., a straight line with a fixed slope). The fitting method of this embodiment has the advantages of a simple fitting process and a fast calculation speed.

[0065] Figure 3 It is a schematic diagram of the fitting curve corresponding to a relationship function, where the horizontal axis S represents the fan speed, and the vertical axis ΔP represents the difference between the air pressure and the gas pressure, that is, the correction coefficient. Figure 3 The average score curve in is the fitting curve corresponding to the fitted linear function expression.

[0066] In an optional embodiment, according to the maximum fan speed, the maximum correction coefficient ΔP max , minimum fan speed and minimum correction factor ΔP min Perform function fitting to obtain the relationship function between fan speed and correction coefficient, which also includes:

[0067] Construct a parabolic function expression with the fan speed as the independent variable and the correction coefficient as the dependent variable;

[0068] The maximum fan speed and the maximum correction coefficient ΔP max , minimum fan speed and minimum correction factor ΔP min Substituting into the parabolic function expression, we can obtain the relationship function between the fan speed and the correction coefficient.

[0069] In actual applications, after testing multiple gas heating furnace prototypes, it was found that for a curve with a fixed slope, in the intermediate load section (combustion loads corresponding to other fan speeds between the maximum fan speed and the minimum fan speed), the oxygen content may be too high, resulting in flameout. The high oxygen content means that the difference ΔP (correction coefficient) between the air pressure and the gas pressure is too large. Therefore, when fitting the relationship function in this embodiment, the linear function expression with a fixed slope is modified to a parabolic function expression, such as Figure 3 As shown, Figure 3 The parabolic function curve in is the fitting curve corresponding to the parabolic function expression. Figure 3The measured data curve in the figure is a plot of the correction coefficient ΔP and the fan speed when the oxygen content of the flue gas collected during the actual debugging process is within the preset oxygen content range. The measured data curve is equivalent to the standard curve, which reflects the correction coefficient ΔP required for different fan speeds in the actual application process. Figure 3 Compared with the measured data curve in the load and speed range in the middle section, for the linear function curve, the correction coefficient ΔP usually exceeds the pressure difference actually required, that is, the correction coefficient ΔP is too large, while for the parabolic function curve, the correction coefficient ΔP is very close to the actual requirement, that is, the parabolic function curve is more in line with the actual demand than the linear function curve.

[0070] Specifically, the parabolic function expression is:

[0071]

[0072] Where ΔP is the correction coefficient, S tgt is the fan speed, S max 、S min are the maximum fan speed and the minimum fan speed respectively, ΔP max , ΔP min are the maximum correction coefficient and the minimum correction coefficient respectively, and the initial value of ρ is 2. When ρ=2, the parabolic function curve is a quadratic function curve.

[0073] A parabola with a fixed curvature is usually difficult to adapt to all models, and the correction coefficient ΔP may be too large or too small. In an optional embodiment, after adjusting the opening of the gas proportional valve so that the difference between the air pressure and the gas pressure is the correction coefficient corresponding to the real-time fan speed, it also includes: obtaining the real-time oxygen content of the flue gas after the mixture of air and gas enters the combustion chamber for combustion; judging whether the real-time oxygen content is within the preset oxygen content standard range; if not, adjusting the value of ρ based on the size relationship between the real-time oxygen content and the boundary value of the oxygen content standard range. Specifically, when the real-time oxygen content is greater than the upper limit of the oxygen content standard range, the ρ value is reduced; when the real-time oxygen content is less than the upper limit of the oxygen content standard range, the ρ value is increased.

[0074] Figure 4 is the parabolic function curve corresponding to different ρ values. Figure 4 In the figure, the linear function curve is used as the basic curve, and the parabolic function curves with different ρ values are shown, as shown in Figure 4As shown, the curvature of the parabolic function curves for different ρ values is different. For the same fan speed, the greater the curvature of the curve, the smaller the correction coefficient ΔP corresponding to the fan speed. Especially in the middle fan speed range, the difference between the correction coefficients ΔP corresponding to parabolas with different curvatures (ρ values) is relatively large. By adjusting the curvature of the curve (ρ value), the corresponding relationship between the fan speed and the correction coefficient ΔP can be adjusted, making the parabolic function expression more consistent with the actual situation. For example, when the load or power of the gas heating furnace is relatively small, its fan speed is relatively small and the fluctuation range is also small. The air pressure is less affected by the fan speed, that is, the correction coefficient ΔP corresponding to the fan speed is also relatively small. Therefore, the ρ value can be set to a relatively large value.

[0075] ΔP max , ΔP min and ρ are parameters that can be set in the control panel of the gas heating furnace. After the whole machine structure is determined, ΔP max and ΔP min The values of the two parameters, ΔP max and ΔP min After inputting the initial ρ value into the main controller, the main controller calculates the ΔP corresponding to each fan speed using a formula. If the oxygen content is too high or too low during the test, the ρ parameter can be fine-tuned. This control method for fully premixed gas heating furnaces shortens the commissioning process, improves gas combustion efficiency, and ensures that the flue gas oxygen content meets the standard.

[0076] Corresponding to the above-mentioned full premixed gas heating furnace control method, the present invention also provides a full premixed gas heating furnace, the premixer of the gas heating furnace includes an air inlet and a gas inlet, the full premixed gas heating furnace includes a main controller, Figure 5 This is a schematic diagram of the structure of the main controller in a full premixed gas heating furnace provided by an embodiment of the present invention. Figure 5 As shown, the main controller includes:

[0077] The parameter acquisition module 100 is used to obtain the maximum correction coefficient ΔP corresponding to the maximum fan speed max The minimum correction coefficient ΔP corresponding to the minimum fan speed min Wherein, the correction coefficient is the difference between the air pressure at the air inlet and the gas pressure at the gas inlet, and the gas heating furnace is at the maximum correction coefficient ΔP max When the fan is running at the maximum speed and at the minimum correction factor ΔP min When the fan is running at the minimum speed under the following conditions, the oxygen content of the flue gas from the mixed combustion of air and gas is within the preset oxygen content standard range;

[0078] Function fitting module 200, for the maximum fan speed, the maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Perform function fitting to obtain the relationship function between the fan speed and the correction coefficient;

[0079] The correction coefficient calculation module 300 is used to obtain the real-time fan speed and substitute the real-time fan speed into the relationship function to obtain the correction coefficient corresponding to the real-time fan speed;

[0080] The proportional valve adjustment module 400 is used to adjust the opening of the gas proportional valve so that the difference between the air pressure and the gas pressure becomes a correction coefficient corresponding to the real-time fan speed.

[0081] Optionally, the proportional valve adjustment module 400 includes:

[0082] A linear function construction module is used to construct a linear function expression with the fan speed as the independent variable and the correction coefficient as the dependent variable;

[0083] A linear function fitting module is used to convert the maximum fan speed and the maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Substituting into the linear function expression, the relationship function between the fan speed and the correction coefficient is obtained.

[0084] Optionally, the linear function expression is:

[0085]

[0086] Where ΔP is the correction coefficient, S tgt is the fan speed, S max 、S min are the maximum fan speed and the minimum fan speed respectively, ΔP max , ΔP min are the maximum correction factor and the minimum correction factor respectively.

[0087] Optionally, the proportional valve adjustment module 400 further includes:

[0088] A parabolic function construction module is used to construct a parabolic function expression with the fan speed as the independent variable and the correction coefficient as the dependent variable;

[0089] The parabola function fitting module is used to convert the maximum fan speed and the maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Substituting this into the parabolic function expression, we can obtain the relationship function between the fan speed and the correction coefficient.

[0090] Optionally, the parabolic function expression is:

[0091]

[0092] Where ΔP is the correction coefficient, S tgt is the fan speed, S max 、S min are the maximum fan speed and the minimum fan speed respectively, ΔP max , ΔP min are the maximum correction coefficient and the minimum correction coefficient respectively, and the initial value of ρ is 2.

[0093] Optionally, the main controller also includes:

[0094] A real-time oxygen content acquisition module is used to obtain the real-time oxygen content of the flue gas after the mixture of air and gas enters the combustion chamber for combustion;

[0095] A real-time oxygen content determination module is used to determine whether the real-time oxygen content is within a preset oxygen content standard range; if not, the contents of the correction coefficient adjustment module are executed;

[0096] The correction coefficient adjustment module is used to adjust the value of ρ according to the relationship between the real-time oxygen content and the boundary value of the oxygen content standard range.

[0097] Optionally, the correction coefficient adjustment module includes:

[0098] A first regulating submodule is configured to reduce the ρ value when the real-time oxygen content is greater than the upper limit of the oxygen content standard range;

[0099] The second regulating submodule is configured to increase the ρ value when the real-time oxygen content is less than the upper limit of the oxygen content standard range.

[0100] The main controller of the full premix gas heating furnace provided in the embodiment of the present invention can execute the full premix gas heating furnace control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0101] Figure 6A schematic diagram of the structure of an electronic device 40 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0102] like Figure 6 As shown, the electronic device 40 includes at least one processor 41 and a memory, such as a read-only memory (ROM) 42, a random access memory (RAM) 43, etc., which is communicatively connected to the at least one processor 41. The memory stores a computer program that can be executed by the at least one processor, and the processor 41 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 42 or the computer program loaded from the storage unit 48 into the random access memory (RAM) 43. Various programs and data required for the operation of the electronic device 40 can also be stored in the RAM 43. The processor 41, ROM 42, and RAM 43 are connected to each other via a bus 44. An input / output (I / O) interface 45 is also connected to the bus 44.

[0103] Multiple components in the electronic device 40 are connected to the I / O interface 45, including an input unit 46, such as a keyboard, a mouse, etc.; an output unit 47, such as various types of displays, speakers, etc.; a storage unit 48, such as a magnetic disk, an optical disk, etc.; and a communication unit 49, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 49 allows the electronic device 40 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0104] Processor 41 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of processor 41 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any other suitable processor, controller, microcontroller, etc. Processor 41 executes the various methods and processes described above, such as the fully premixed gas heating furnace control method.

[0105] In some embodiments, the full premix gas heating furnace control method can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 48. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 40 via the ROM 42 and / or the communication unit 49. When the computer program is loaded into the RAM 43 and executed by the processor 41, one or more steps of the full premix gas heating furnace control method described above can be performed. Alternatively, in other embodiments, the processor 41 can be configured to execute the full premix gas heating furnace control method by any other appropriate means (for example, by means of firmware).

[0106] Various embodiments of the systems and techniques described above can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0107] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0108] In the context of the present invention, a computer readable storage medium may be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device.

[0109] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a monitor having a cathode ray tube or a liquid crystal display) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0110] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0111] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A control method for a fully premixed gas heating furnace, characterized in that: The premixer of the gas heating furnace includes an air inlet and a gas inlet, and the method includes: Get the maximum correction coefficient ΔP corresponding to the maximum fan speed max The minimum correction coefficient ΔP corresponding to the minimum fan speed min Wherein, the correction coefficient is the difference between the air pressure at the air inlet and the gas pressure at the gas inlet, and the gas heating furnace is at the maximum correction coefficient ΔP max When the fan is running at the maximum speed and at the minimum correction factor ΔP min When the fan is running at the minimum speed under the following conditions, the oxygen content of the flue gas from the mixed combustion of air and gas is within the preset oxygen content standard range; According to the maximum fan speed, the maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Perform function fitting to obtain the relationship function between the fan speed and the correction coefficient; Obtaining a real-time fan speed, and substituting the real-time fan speed into the relationship function to obtain a correction coefficient corresponding to the real-time fan speed; The opening of the gas proportional valve is adjusted so that the difference between the air pressure and the gas pressure becomes the correction coefficient corresponding to the real-time fan speed.

2. The method according to claim 1, wherein According to the maximum fan speed, the maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Perform function fitting to obtain the relationship function between the fan speed and the correction coefficient, including: Construct a linear function expression with the fan speed as the independent variable and the correction coefficient as the dependent variable; The maximum fan speed, the maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Substituting into the linear function expression, the relationship function between the fan speed and the correction coefficient is obtained.

3. The method according to claim 2, wherein The linear function expression is: Where ΔP is the correction coefficient, S tgt is the fan speed, S max 、S min are the maximum fan speed and the minimum fan speed respectively, ΔP max , ΔP min are the maximum correction factor and the minimum correction factor respectively.

4. The method according to claim 1, wherein According to the maximum fan speed, the maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Perform function fitting to obtain the relationship function between fan speed and correction coefficient, which also includes: Construct a parabolic function expression with the fan speed as the independent variable and the correction coefficient as the dependent variable; The maximum fan speed, the maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Substituting this into the parabolic function expression, we can obtain the relationship function between the fan speed and the correction coefficient.

5. The method according to claim 4, wherein The parabolic function expression is: Where ΔP is the correction coefficient, S tgt is the fan speed, S max 、S min are the maximum fan speed and the minimum fan speed respectively, ΔP max , ΔP min are the maximum correction coefficient and the minimum correction coefficient respectively, and the initial value of ρ is 2.

6. The method according to claim 5, wherein After adjusting the opening of the gas proportional valve so that the difference between the air pressure and the gas pressure is equal to the correction coefficient corresponding to the real-time fan speed, the method further includes: After the mixture of air and gas enters the combustion chamber and burns, the real-time oxygen content of the flue gas is obtained; Determining whether the real-time oxygen content is within a preset oxygen content standard range; If not, the value of ρ is adjusted according to the relationship between the real-time oxygen content and the boundary value of the oxygen content standard range.

7. The method according to claim 6, wherein The adjusting the value of ρ according to the relationship between the real-time oxygen content and the boundary value of the standard range of oxygen content includes: When the real-time oxygen content is greater than the upper limit of the oxygen content standard range, the ρ value is adjusted to a smaller value; When the real-time oxygen content is less than the upper limit of the oxygen content standard range, the ρ value is increased.

8. A fully premixed gas heating furnace, characterized in that: The premixer of the gas heating furnace includes an air inlet and a gas inlet, and the gas heating furnace includes a main controller, which includes: Parameter acquisition module, used to obtain the maximum correction coefficient ΔP corresponding to the maximum fan speed max The minimum correction coefficient ΔP corresponding to the minimum fan speed min Wherein, the correction coefficient is the difference between the air pressure at the air inlet and the gas pressure at the gas inlet, and the gas heating furnace is at the maximum correction coefficient ΔP max When the fan is running at the maximum speed and at the minimum correction factor ΔP min When the fan is running at the minimum speed under the following conditions, the oxygen content of the flue gas from the mixed combustion of air and gas is within the preset oxygen content standard range; Function fitting module, used for according to the maximum fan speed, maximum correction coefficient ΔP max , the minimum fan speed and the minimum correction coefficient ΔP min Perform function fitting to obtain the relationship function between the fan speed and the correction coefficient; a correction coefficient calculation module, configured to obtain a real-time fan speed, and substitute the real-time fan speed into the relationship function to obtain a correction coefficient corresponding to the real-time fan speed; The proportional valve adjustment module is used to adjust the opening of the gas proportional valve so that the difference between the air pressure and the gas pressure becomes the correction coefficient corresponding to the real-time fan speed.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the full-premix gas heating furnace control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the full-premix gas heating furnace control method according to any one of claims 1 to 7 when executed.

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