Control method of combustion system and combustion system

Abstract

The invention discloses a control method of a combustion system and the combustion system, and belongs to the technical field of combustion control. The control method of the combustion system comprises the steps that fuel gas is controlled to be input into the first-stage combustion module, so that the fuel gas and air in the first-stage combustion module are subjected to mixed combustion, and gas which is not fully combusted enters the second-stage combustion module through flow guide fins; and gas is controlled to be input into the second-stage combustion module, so that the gas is mixed with gas which is not fully combusted in the second-stage combustion module and air in the second-stage combustion module for combustion. According to the control method of the combustion system, the emission amount of harmful gas is reduced, and the combustion heat efficiency of the system is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of combustion control, and particularly relates to a control method of a combustion system and the combustion system. BACKGROUND

[0002] With the increasingly stringent requirements of the state on the emission standards of household and commercial gas equipment, the combustion emission and energy efficiency of the combustion system have attracted widespread attention. In order to meet the requirements of low pollution and low energy consumption, the industry has carried out a large number of researches and improvements on the combustion performance and emission control of the combustion system. In the related art, high carbon monoxide emission is easily generated in the combustion process, resulting in a low level of combustion thermal efficiency. In addition, the existing combustion system is usually equipped with only an electronic control or mechanical control combustion adjusting device, and it is difficult to implement accurate gas pressure compensation based on the state in the combustion system. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a control method of a combustion system and the combustion system, which realizes staged combustion and accurate gas pressure compensation, reduces the emission amount of harmful gas, and improves the combustion thermal efficiency of the system.

[0004] In a first aspect, the present application provides a control method of a combustion system, the combustion system comprising a primary combustion module and a secondary combustion module, the primary combustion module and the secondary combustion module being in gas exchange through a guide fin, the primary combustion module sucking air through a primary air inlet, and the secondary combustion module sucking air through a secondary air inlet; the method comprising:

[0005] controlling input of fuel gas into the primary combustion module, so that the fuel gas is mixed with the air in the primary combustion module and burns, and the unburned gas enters the secondary combustion module through the guide fin;

[0006] controlling input of fuel gas into the secondary combustion module, so that the fuel gas is mixed with the unburned gas in the secondary combustion module and the air in the secondary combustion module and burns.

[0007] According to the control method of the combustion system of the present application, staged combustion is realized by controlling the input of fuel gas in the primary combustion module and the secondary combustion module in the combustion system, the accuracy of gas pressure compensation in the system is improved, so that the unburned gas, air and fuel gas in the system are fully mixed and burned, thereby reducing the emission amount of harmful gas and improving the combustion thermal efficiency of the system.

[0008] According to an embodiment of the present application, the controlling input of fuel gas into the secondary combustion module comprises:

[0009] obtaining the gas concentration of the unburned gas;

[0010] Based on the gas concentration, adjust the damper opening of the secondary air inlet to achieve a target ratio of the fuel gas concentration to the air concentration.

[0011] According to one embodiment of the present application, based on the gas concentration, adjusting the damper opening of the secondary air inlet comprises:

[0012] In the case that the CO gas concentration parameter in the insufficiently combusted gas is less than a first target concentration threshold, the control system maintains the current damper opening of the secondary air inlet;

[0013] In the case that the CO gas concentration parameter in the insufficiently combusted gas is greater than or equal to the first target concentration threshold and less than or equal to a second target concentration threshold, the damper opening of the secondary air inlet of the control system is a first target opening;

[0014] In the case that the CO gas concentration in the insufficiently combusted gas is greater than the second target concentration threshold, the damper opening of the secondary air inlet of the control system is a second target opening.

[0015] According to one embodiment of the present application, controlling the input of fuel gas into the primary combustion module comprises:

[0016] Obtaining a gas flow rate in the primary air inlet;

[0017] Based on the gas flow rate, adjusting at least one of the damper opening of the secondary air inlet and the intake valve opening of the primary combustion module.

[0018] According to one embodiment of the present application, based on the gas flow rate, adjusting at least one of the damper opening of the secondary air inlet and the intake valve opening of the primary combustion module comprises:

[0019] In the case that the gas flow rate is less than a first flow rate threshold and greater than or equal to a second flow rate threshold, adjusting the damper opening of the secondary air inlet;

[0020] In the case that the gas flow rate is less than the second flow rate threshold and greater than a third flow rate threshold, adjusting the damper opening of the secondary air inlet and the intake valve opening of the primary combustion module;

[0021] In the case that the gas flow rate is less than the third flow rate threshold, adjusting the intake valve opening of the primary combustion module;

[0022] The first flow rate threshold is greater than the second flow rate threshold and greater than the third flow rate threshold; the second flow rate threshold is greater than the third flow rate threshold.

[0023] According to one embodiment of the present application, before controlling the input of fuel gas into the primary combustion module, the method further comprises:

[0024] Obtaining pressure data at the fuel gas inlet of the primary combustion module and the secondary combustion module;

[0025] In a case where it is determined that the pressure is normal based on the pressure data, the current intake valve opening degree is maintained unchanged;

[0026] In a case where it is determined that the pressure is abnormal based on the pressure data, the air pressure compensation is controlled.

[0027] According to an embodiment of the present application, the combustion system further comprises an electronic compensation system and a mechanical compensation system; the air pressure compensation is controlled, comprising:

[0028] The air pressure compensation is performed based on the electronic compensation system and / or the mechanical compensation system.

[0029] According to an embodiment of the present application, the air pressure compensation is performed based on the electronic compensation system and / or the mechanical compensation system, comprising:

[0030] In a case where the electronic compensation system is normal and the fluctuation value of the pressure data is less than a first threshold value, the air pressure compensation is performed by using the electronic compensation system;

[0031] In a case where the electronic compensation system is normal and the fluctuation value of the pressure data is greater than or equal to the first threshold value, the air pressure compensation is performed by using the electronic compensation system and the mechanical compensation system;

[0032] In a case where the electronic compensation system fails, the air pressure compensation is performed by using the mechanical compensation system.

[0033] In a second aspect, the present application provides a combustion system, comprising:

[0034] A primary combustion module, which sucks in air through a primary air inlet;

[0035] A secondary combustion module, which exchanges gas with the primary combustion module through a guide fin, and sucks in air through a secondary air inlet;

[0036] A control module, which is used to execute the control method of the combustion system according to the first aspect.

[0037] According to an embodiment of the present application, the primary combustion module comprises:

[0038] A primary gas inlet;

[0039] A primary combustion area;

[0040] A primary air inlet connected between the primary gas inlet and the primary combustion area;

[0041] The secondary combustion module comprises:

[0042] A secondary gas inlet;

[0043] A secondary combustion area;

[0044] a secondary air inlet connected between the secondary gas inlet and the secondary combustion area.

[0045] According to the combustion system, by controlling the input of the gas in the primary combustion module and the secondary combustion module, the staged combustion is realized, the accuracy of the gas pressure compensation in the system is improved, the unburned gas, the air and the gas in the system are fully mixed and combusted, the emission of the harmful gas is reduced, and the combustion heat efficiency of the combustion system is improved.

[0046] In a third aspect, the present application provides a control device of a combustion system, the control device of the combustion system comprising a primary combustion module and a secondary combustion module, the primary combustion module and the secondary combustion module being in gas exchange through a flow guide fin, the primary combustion module sucking in air through a primary air inlet, and the secondary combustion module sucking in air through a secondary air inlet; the device comprising:

[0047] a first processing module configured to control the input of the gas into the primary combustion module, so that the gas is mixed and combusted with the air in the primary combustion module, and the unburned gas enters the secondary combustion module through the flow guide fin;

[0048] a second processing module configured to control the input of the gas into the secondary combustion module, so that the gas is mixed and combusted with the unburned gas in the secondary combustion module and the air in the secondary combustion module.

[0049] According to the control device of the combustion system, by controlling the input of the gas in the primary combustion module and the secondary combustion module, the staged combustion is realized, the accuracy of the gas pressure compensation in the system is improved, the unburned gas, the air and the gas in the system are fully mixed and combusted, the emission of the harmful gas is reduced, and the combustion heat efficiency of the system is improved.

[0050] In a fourth aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the control method of the combustion system according to the first aspect when executing the computer program.

[0051] In a fifth aspect, the present application provides a non-transitory computer readable storage medium, having a computer program stored thereon, and the computer program is executable on a processor to implement the control method of the combustion system according to the first aspect.

[0052] In a sixth aspect, the present application provides a computer program product, comprising a computer program, and the computer program is executable on a processor to implement the control method of the combustion system according to the first aspect.

[0053] The one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0054] By controlling the gas input in the primary combustion module and the secondary combustion module in the combustion system, staged combustion is realized, the accuracy of the gas pressure compensation in the system is improved, so that the unburned gas, air and gas in the system are fully mixed and burned, thereby reducing the emission of harmful gases and improving the combustion thermal efficiency of the system.

[0055] Further, based on the state of the electronic compensation system and the range in which the fluctuation value of the pressure data is located, the system can realize gas pressure compensation in the mode of electronic compensation, mechanical compensation or combination of both, so that the system can maintain a stable air-fuel ratio, improve the flexibility and accuracy of gas pressure compensation, and in the case of failure of the electronic compensation system, automatically switch to the mechanical compensation mode, improve the stability of system combustion, reduce the risk of flameout, thereby reducing the emission of harmful gases and improving the combustion thermal efficiency of the system.

[0056] Further, based on the CO concentration parameter, the system dynamically adjusts the opening degree of the secondary air door, and according to different CO concentrations, realizes staged adjustment of air flow, so that the unburned gas is fully mixed and burned with air, thereby reducing the emission of harmful gases and improving the combustion thermal efficiency of the system.

[0057] Further, by acquiring multiple state parameters such as flame signal, CO concentration parameter and power supply voltage in the system, it can be more comprehensive to judge whether the system is in normal state. When detecting system failure, a multi-mode switching strategy is adopted to ensure safe operation of the system, and a safety alarm is triggered when necessary, thereby improving the combustion stability, safety and system response speed.

[0058] Additional aspects and advantages of the application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0059] The above and / or additional aspects and advantages of the application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0060] Figure 1 is one of the flowcharts of the control method of the combustion system provided by the embodiments of the application;

[0061] Figure 2 is a structural schematic diagram of the combustion module provided by the embodiments of the application;

[0062] Figure 3 is another flowchart of the control method of the combustion system provided by the embodiments of the application;

[0063] Figure 4Figure 3 is a flowchart of a third embodiment of the control method of the combustion system provided in the present application;

[0064] Figure 5 Figure 4 is a flowchart of a fourth embodiment of the control method of the combustion system provided in the present application;

[0065] Figure 6 Figure 5 is a flowchart of a fifth embodiment of the control method of the combustion system provided in the present application;

[0066] Figure 7 Figure 6 is a flowchart of a sixth embodiment of the control method of the combustion system provided in the present application;

[0067] Figure 8 Figure 7 is a structural diagram of the control device of the combustion system provided in the present application;

[0068] Figure 9 Figure 8 is a structural diagram of the electronic device provided in the present application.

[0069] Reference signs:

[0070] Primary combustion zone 210, primary air inlet 220, primary gas inlet 230;

[0071] Secondary combustion zone 240, secondary air inlet 250, secondary gas inlet 260. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0073] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a category and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0074] The control method of the combustion system, the combustion system, the control device of the combustion system and the readable storage medium provided in the embodiments of the present application will be described in detail below with reference to the drawings, through specific embodiments and their application scenarios.

[0075] The control method of the combustion system can be applied to a terminal and can be executed by hardware or software in the terminal.

[0076] The control method of the combustion system provided in the embodiments of the present application can be executed by the combustion system or a functional module or functional entity in the combustion system that can implement the control method of the combustion system. The control method of the combustion system provided in the embodiments of the present application is described below with the combustion system as an example.

[0077] It should be noted that the combustion system in the embodiments of the present application can be understood as a general combustion system, including but not limited to a gas stove, a gas water heater, a gas wall-hanging stove, a gas boiler, and an industrial combustion furnace, and the like. The combustion system has various structural forms and is widely applied.

[0078] Reference is made to Figure 2 The combustion system includes a primary combustion module and a secondary combustion module. The primary combustion module and the secondary combustion module exchange gas through a guide fin.

[0079] The primary combustion module can include a primary gas inlet 230, a primary combustion zone 210, and a primary air inlet 220 connected between the primary gas inlet 230 and the primary combustion zone 210, and the like. The primary combustion zone 210 is a main combustion zone, and about 80% of the gas completes basic combustion in the primary combustion zone.

[0080] Reference is made to Figure 2 The secondary combustion module can include a secondary gas inlet 260, a secondary combustion zone 240, and a secondary air inlet 250 connected between the secondary gas inlet 260 and the secondary combustion zone 240, and the like. The secondary combustion zone 240 is a supplementary combustion zone, which is used for completely oxidizing the incompletely combusted gas to reduce CO emissions.

[0081] As shown in Figure 1 The control method of the combustion system includes steps 110 and 120.

[0082] In step 110, the gas is input into the primary combustion module, so that the gas is mixed with air in the primary combustion module and combusted, and the incompletely combusted gas enters the secondary combustion module through the guide fin.

[0083] In some embodiments, reference is made to Figure 2 The primary combustion module inhales air through the primary air inlet 220, and the secondary combustion module inhales air through the secondary air inlet 250.

[0084] Reference is made to Figure 2In this embodiment, the gas is input into the primary combustion module through the primary gas inlet 230, such as a small-hole nozzle, and the primary air is input into the primary combustion module through the primary air inlet 220, such as a Venturi tube; the gas and the air are mixed and combusted in the primary combustion zone 210.

[0085] The Venturi tube includes a contraction section, a throat section, and an expansion section. When the gas is sprayed at high speed through the small-hole nozzle and enters the contraction section of the Venturi tube, the gas flow rate increases and the static pressure decreases, forming a negative pressure area in the throat section of the Venturi tube. Through the negative pressure effect, the primary air is introduced into the primary combustion module through the Venturi tube.

[0086] In this embodiment, the aperture gradient design range of the small-hole nozzle can be 0.8-1.0 mm, and the input rate of the gas can be 10-15 m / s; the throat diameter of the Venturi tube can be Φ8±0.1 mm.

[0087] The primary gas and the primary air are mixed according to the preset air-fuel ratio through the small-hole nozzle and the Venturi structure, and enter the primary combustion zone 210. The air-fuel ratio refers to the ratio of the gas to the total air amount, and the total air amount refers to the total air amount in the primary combustion zone 210 and the secondary combustion zone 240.

[0088] In some embodiments, the preset air-fuel ratio α can be controlled in the range of 0.6-0.8.

[0089] In some embodiments, referring to Figure 2 , the gas can also be input into the secondary combustion module through the secondary gas inlet 260, such as a small-hole nozzle, the secondary air is input into the secondary combustion module through the secondary air inlet 250, such as an annular structure with a gap, and the insufficiently combusted gas, the gas, and the air are mixed and combusted in the secondary combustion zone 240.

[0090] In this embodiment, the aperture gradient design range of the small-hole nozzle can be 1.0-1.2 mm; the width of the annular structure with a gap can be 3-5 mm, and the width of the annular structure can be adjusted. The proportion of the secondary air in the total air amount can be controlled in the range of 20%-30%, so that the air-fuel ratio α is increased and controlled in the range of 1.1-1.3.

[0091] In some embodiments, when the combustion system is started, the primary combustion zone 210 and the secondary combustion zone 240 are ignited at the same time.

[0092] In some embodiments, the primary combustion zone 210 can also include an annular flame stabilizing tooth structure and an ion probe.

[0093] The parameters of the annular flame stabilizing tooth can be a tooth height of 2 mm and a tooth spacing of 5 mm, which are used to form a low-speed recirculation zone at the root of the flame; and the ion probe is used to monitor the flame signal.

[0094] In some embodiments, when the flame signal frequency is stabilized in the range of 8-12 Hz, it can be determined that the combustion condition is normal; and when the flame signal frequency is less than 5 Hz, an emergency protection is triggered.

[0095] Reference Figure 3 During the air supply process, the primary air is injected into the combustion module through the Venturi tube, and participates in combustion after being fully mixed with the fuel gas; when the fuel gas pressure is 0.5 kPa, the suction amount of the primary air is 0.32 m 3 / h, and the injection efficiency is about 85%; when the fuel gas pressure rises to 1.0 kPa, the suction amount of the primary air increases to 0.65 m 3 / h, and the injection efficiency increases to about 92%; when the fuel gas pressure further rises to 2.0 kPa, the suction amount of the primary air reaches 1.30 m 3 / h, and the injection efficiency is about 88%.

[0096] Table 1 below shows the relationship between the fuel gas pressure, the suction amount of the primary air, and the Venturi injection efficiency in the system.

[0097] Table 1

[0098] Gas pressure (kPa) Air intake (m 3 / h)]]> Ejection efficiency 0.5 0.32 85％ 1.0 0.65 92％ 2.0 1.30 88％

[0099] In some embodiments, the insufficiently combusted gas is the product after the fuel gas and air are mixed and combusted, and the components include carbon monoxide (CO), carbon dioxide (CO2), unburned combustible hydrocarbons, and a small amount of nitrogen, etc.; wherein, CO is the main component.

[0100] In some embodiments, the input of the fuel gas into the primary combustion module is controlled, including:

[0101] Obtaining the gas flow rate in the primary air inlet 220;

[0102] Based on the gas flow rate, adjusting at least one of the damper opening degree of the secondary air inlet 250 and the air inlet valve opening degree of the primary combustion module.

[0103] In this embodiment, the obtained gas flow rate is the gas flow rate at the throat of the primary air inlet 220.

[0104] It should be noted that the gas flow rate at the primary air inlet 220 should be controlled to be 12±2m / s; in the case that the gas flow rate is less than <10m / s, it may cause the flame to be extinguished or extinguished in the system, so it is necessary to adjust at least one of the damper opening degree of the secondary air inlet 250 and the air inlet valve opening degree of the primary combustion module based on the gas flow rate to implement the gas supplement measure.

[0105] In some embodiments, adjusting at least one of the damper opening degree of the secondary air inlet 250 and the air inlet valve opening degree of the primary combustion module based on the gas flow rate comprises:

[0106] in the case that the gas flow rate is less than the first flow rate threshold and greater than or equal to the second flow rate threshold, adjusting the damper opening degree of the secondary air inlet 250;

[0107] in the case that the gas flow rate is less than the second flow rate threshold and greater than the third flow rate threshold, adjusting the damper opening degree of the secondary air inlet 250 and the air inlet valve opening degree of the primary combustion module;

[0108] in the case that the gas flow rate is less than the third flow rate threshold, adjusting the air inlet valve opening degree of the primary combustion module;

[0109] In this embodiment, the first flow rate threshold is greater than the second flow rate threshold and greater than the third flow rate threshold; the second flow rate threshold is greater than the third flow rate threshold.

[0110] Reference Figure 3 In the process of gas distribution, the specific implementation of the above-mentioned gas supplement measures is described in combination with a certain working condition.

[0111] in the case that the gas flow rate is less than 12m / s and greater than or equal to 10m / s, fine-tuning the damper opening degree of the secondary air inlet 250, so that the damper opening degree increases by 5%, the response time of this gas supplement measure is less than 200ms;

[0112] in the case that the gas flow rate is less than 10m / s and greater than or equal to 8m / s, the gas supplement solenoid valve is opened, the duty cycle of the gas supplement solenoid valve is set to 30%, the response time of this gas supplement measure is less than 100ms;

[0113] in the case that the gas flow rate is less than 8m / s, the gas supplement solenoid valve is opened to the full open state, and the gas pressure is increased by 10% based on the original gas pressure, the response time of this gas supplement measure is less than 50ms.

[0114] The following Table 2 illustrates the judgment logic of adjusting the actuator based on the flow rate threshold in the system.

[0115] Table 2

[0116] Judgment condition Air supplement measure Response time 10 m / s < flow rate < 12 m / s Fine-tune secondary air damper opening (+5%) <200 ms 8 m / s < flow rate < 10 m / s Open air supplement solenoid valve (duty cycle 30%) <100 ms Flow rate < 8 m / s Fully open air supplement valve + increase gas pressure (+10%) <50 ms

[0117] In this embodiment, the gas replenishment measure can be represented in code as follows:

[0118] void adjust_combustion(float velocity){

[0119] if (velocity < 10.0f) {

[0120] float deficit = 12.0f - velocity; / / velocity gap

[0121] / / Calculation of air replenishment volume (proportional control)

[0122] float gas_boost = deficit * 0.15f; / / Gas boosting coefficient (calibrated value)

[0123] set_gas_valve(gas_boost); / / Adjust the gas valve

[0124] set_air_damper(gas_boost*0.8f); / / Simultaneously increase secondary airflow

[0125] }}

[0126] Specifically, when the detected gas velocity is less than 10.0 m / s, the difference between the gas velocity and the gas velocity is calculated to obtain the velocity gap (deficit). Based on this, the gas boost is calculated by multiplying the pre-set proportional coefficient 0.15 by the velocity gap (deficit). The gas boost is then adjusted using the gas boost solenoid valve (set_gas_valve) to implement the gas boost. Simultaneously, the secondary air damper opening (set_air_damper) is adjusted based on the product of the gas boost and the proportional coefficient 0.8 to implement the gas boost.

[0127] In some embodiments, before controlling the input of fuel gas into the primary combustion module, the method further includes:

[0128] Acquire pressure data at the gas inlet in the primary and secondary combustion modules;

[0129] If the pressure is determined to be normal based on the pressure data, maintain the current intake valve opening unchanged;

[0130] When an abnormal pressure is identified based on pressure data, pressure compensation is performed by the control system.

[0131] In this embodiment, the pressure data at the gas inlet can be obtained by a pressure sensor, such as a MEMS sensor or a piezoresistive sensor.

[0132] Reference Figure 3 In actual implementation, determining whether the pressure is normal based on the pressure data can be performed through the following embodiments:

[0133] In the case that the pressure data is in the range of 0.5-3.0 kPa, it is determined that the pressure is normal, and the current intake valve opening degree is maintained unchanged;

[0134] In the case that the pressure data is less than 0.4 kPa, it is determined that the pressure is abnormal, and a low-pressure alarm is triggered;

[0135] In the case that the pressure data is greater than 3.5 kPa, it is determined that the pressure is abnormal, and a high-pressure alarm is triggered.

[0136] Step 120, control input of the fuel gas into the secondary combustion module, so that the fuel gas is mixed with the insufficiently combusted gas in the secondary combustion module and the air in the secondary combustion module and combusted.

[0137] In some embodiments, referring to Figure 2 , the fuel gas can be input into the secondary combustion module through a secondary fuel gas inlet 260, such as a small-hole nozzle, and the secondary air can be input into the secondary combustion module through a secondary air inlet 250, such as an annular structure with a gap; the insufficiently combusted gas, the fuel gas and the air are combusted in the secondary combustion zone 240.

[0138] In this embodiment, the aperture gradient design range of the small-hole nozzle can be 1.0-1.2 mm; the width of the annular structure with a gap can be 3-5 mm, and the width of the annular structure can be adjusted. The proportion of the secondary air in the total air volume can be controlled in the range of 20%-30%, so that the air-fuel ratio a is increased and controlled in the range of 1.1-1.3.

[0139] The inventors found in the research and development process that in the related art, a primary combustion strategy is mostly used, and the combustion thermal efficiency is low and the emission amount of harmful gas is high

[0140] In the present application, by setting a multi-stage combustion structure, the input of the fuel gas in the primary combustion module and the secondary combustion module in the combustion system is controlled to be fully mixed with the air, so that staged combustion is realized, so that the insufficiently combusted gas, the air and the fuel gas in the system are fully mixed and combusted, thereby reducing the emission amount of harmful gas and improving the combustion thermal efficiency.

[0141] In some embodiments, the combustion system further comprises an electronic compensation system and a mechanical compensation system; the gas pressure compensation is controlled, comprising:

[0142] The gas pressure compensation is performed based on the electronic compensation system and / or the mechanical compensation system.

[0143] In this embodiment, reference is made to Figure 6 , the gas pressure compensation is started from the start-up stage of the combustion system, in the case of abnormal pressure, the gas flow is adjusted by the electronic compensation system and / or the mechanical compensation system, and the pressure is restored to the normal range. The gas pressure control measures, for example: in the low pressure state, the system increases the gas flow by appropriately increasing the opening degree of the gas valve, and the pressure is increased and stabilized in the range of 0.5-3.0 kPa.

[0144] In some embodiments, the gas pressure compensation can also be performed during the entire combustion stage of the system, or can be executed synchronously with the secondary combustion. It should be noted that there is also a priority between the two, the gas pressure compensation guarantees the basic combustion, and the secondary combustion follows, and under the premise of stable gas pressure, the air door adjustment opening degree is used to supplement the combustion.

[0145] In some embodiments, the process of gas pressure compensation based on the electronic compensation system and / or the mechanical compensation system can refer to Figure 7 , including: the electronic compensation system obtains pressure data through the pressure sensor, and feeds back the pressure data to the electronic system; the electronic system calculates the gas pressure compensation amount based on the pressure data, combined with the PID control algorithm, the compensation calculation algorithm, etc.; the actuator is adjusted based on the gas pressure compensation amount, the opening degree of the valve is controlled, the gas flow is adjusted, and the gas pressure compensation is realized.

[0146] In this embodiment, the pressure sensor can be a MEMS pressure sensor; the actuator can include solenoid valves, micro pumps, and stepper motors, etc.

[0147] In some embodiments, the feedforward compensation formula for adjusting the gas flow through the gas pressure compensation can be determined based on the gas flow and the pressure difference between the gas inlet and outlet, which is expressed as:

[0148] Q=K√ΔP

[0149] Where Q represents the gas flow, unit m 3 / h, that is, the instantaneous flow of gas through the valve; K represents the flow coefficient (dimensionless), which is determined by the valve structure, the type of gas (natural gas / liquefied gas) and temperature. The value of K can be obtained based on experimental data; ΔP represents the pressure difference between the gas inlet and outlet, unit kPa.

[0150] Referring to Figure 4 , the process of adjusting the gas flow to realize the gas pressure compensation is described below.

[0151] In actual operation, the electronic compensation system acquires pressure data ΔP via a MEMS pressure sensor at a frequency of 100ms / time. Based on the pressure data ΔP and substituting it into the formula, the required gas flow rate Q is calculated. The position of the valve core driven by the stepper motor is dynamically adjusted through a PID control algorithm. For example, when ΔP decreases from 1.0kPa to 0.6kPa, the target valve core opening is calculated to increase by 15%, and the stepper motor drives the valve core to a step angle of 0.1° for pressure compensation. The Hall sensor detects whether the target valve core opening matches the actual opening, and the electronic compensation system adjusts the valve core opening based on the detection result to achieve pressure compensation. The response time of the PID control should be less than 100ms.

[0152] In some embodiments, the range of the MEMS pressure sensor can be set to 0–5 kPa, using I0 2 The C interface output has an accuracy of ±0.1 kPa; the stall torque of the stepper motor can be set to 0.5 N·m.

[0153] Based on the parameters and hardware settings in this embodiment, the process of adjusting the valve core position driven by the stepper motor using the PID control algorithm can be represented in code as follows:

[0154] void advanced_PID(){

[0155] static float integral = 0;

[0156] float error=target_pressure-sensor_read();

[0157] float dP = (error - prev_error) / 0.1f; / / Pressure change rate (100ms period)

[0158] / / Variable parameter PID

[0159] float Kp=0.8f+0.05f*fabs(error);

[0160] output=Kp*error+0.1f*integral+0.4f*dP;

[0161] / / Output limiting protection

[0162] if(output>130.0f)output=130.0f;

[0163] set_valve(output);}

[0164] Wherein, the deviation value error between the target pressure target pressure and the current pressure sensor_read() is calculated; under the fixed sampling period of 100 ms, the deviation difference between the deviation value error and the adjacent sampling point prev_error is calculated to obtain the pressure change rate dP; the proportional coefficient Kp is calculated based on the product of the absolute value of the deviation value error and the adjustment factor, the sum of the product and the constant bias term; the product of the deviation value error and the proportional coefficient Kp, the product of the integral of the deviation over time integral and the integral coefficient Ki (Ki is 0.1 in this algorithm), and the product of the pressure change rate dP and the proportional coefficient are calculated, and the sum of the above three types of products is calculated to obtain the output output; in the case where the calculated output output is greater than 130.0f, the output output is limited to 130.0f, and the output amplitude limiting protection is implemented; based on the output output, the valve actuator set_valve is controlled to adjust the position of the valve core driven by the stepper motor, so as to adjust the gas flow.

[0165] The following will take the process of pressure compensation of an electronic compensation system through a compensation calculation algorithm as an example for description.

[0166] In some embodiments, the compensation calculation algorithm can be represented by code as follows:

[0167] float calculate compensation (float P) {

[0168] / / Standard parameter definition

[0169] const float BASE OPEN = 60.0f; / / Reference opening (1.0 kPa)

[0170] const float COMP FACTOR = 0.5f; / / Pressure compensation coefficient

[0171] const float P MIN = 0.2f; / / Effective lower limit of pressure (to prevent sensor abnormalities)

[0172] const float P MAX = 5.0f; / / Effective upper limit of pressure

[0173] / / Data validity check

[0174] if (P < P MIN || P > P MAX) {

[0175] log error ("Invalid pressure: %.2f kPa", P);

[0176] return BASE_OPEN; / / return safe base value

[0177] }

[0178] / / sliding average filter (boost stability)

[0179] static float prev_values[3] = {0};

[0180] static int idx = 0;

[0181] prev_values[idx++] = P;

[0182] if(idx >= 3) idx = 0;

[0183] float filtered_P = (prev_values[0] + prev_values[1] + prev_values[2]) / 3.0f;

[0184] / / non-linear compensation calculation (with deadband rejection perturbations)

[0185] float delta = 1.0f - filtered_P;

[0186] if(fabs(delta) < 0.05f) delta = 0.0f; / / deadband ±0.05kPa

[0187] / / final compensation opening

[0188] return BASE_OPEN * (1.0f + COMP_FACTOR * delta);

[0189] wherein a base opening BASE_OPEN, a pressure compensation factor COMP_FACTOR, and a pressure effective lower limit P_MIN, a pressure effective upper limit P_MAX are set.

[0190] The current pressure P is obtained, and in the case that P is less than P_MIN or greater than P_MAX, the current pressure P is determined as invalid data and the reference opening BASE_OPEN is returned; in the case that the current pressure P is determined as valid data, the current pressure P is stored in an array prev_values with a fixed length of 3, an average value of the latest three pressure values including the current value in the array is calculated as a filtered pressure value filtered_P; a difference value delta of 1.0f and the filtered pressure value filtered_P is calculated, and in the case that the absolute value of delta is less than 0.05, delta is set to zero; a first product of a compensation factor COMP_FACTOR and the difference value delta is calculated, and a second product of the sum of the first product and 0.1 and BASE_OPEN is taken as a final opening output, the valve opening is controlled, the gas flow is adjusted, and the gas pressure compensation is realized.

[0191] It should be noted that the reference opening BASE_OPEN is the opening of the actuator when the system pressure is 1.0kPa.

[0192] Reference Figure 4 In some embodiments, during the operation of the system, for example, in the case that the system startup phase or the system running time is greater than 24h, the system will perform a self-check to determine whether the system itself and the electronic compensation system are in a normal working state; wherein the state detection of the electronic compensation system starts from the system startup and continues until the system is turned off.

[0193] The mechanical compensation system obtains pressure data through a pressure sensor and adjusts the gas flow through a pure mechanical execution structure to implement gas pressure compensation.

[0194] In some embodiments, the pressure sensor can be a MEMS sensor; the pure mechanical structure can include a spring, a diaphragm, a lever mechanism, etc.

[0195] In this embodiment, the range of the MEMS pressure sensor can be set to 0-5kPa, and the accuracy can be ±0.1kPa; the spring constant of the spring can be 5-8N / mm; the diaphragm can be a silica gel diaphragm with a diameter of 30-50mm.

[0196] It can be understood that the accuracy of the mechanical compensation mode can be slightly lower than that of the electronic compensation mode, but it can still ensure the stable operation of the system in the case of electronic failure.

[0197] In the actual execution process, the mechanical compensation system under low pressure working condition and high pressure working condition is taken as an example for illustration.

[0198] In the low pressure condition, such as the air pressure is greater than 1 kPa, the silica gel diaphragm in the mechanical compensation system is retracted due to insufficient air pressure, driving the valve stem to compress the spring, so that the valve core opening is increased by the first percentage on the basis of the reference opening, and the first percentage can be in the range of 15-20%, adjusting the gas flow to increase to 1.2-1.5 times the standard value;

[0199] In the high pressure condition, such as the air pressure is greater than 2.5 kPa, the air pressure drives the diaphragm in the mechanical compensation system to expand, the spring is stretched, and the valve core opening is reduced by the second percentage on the basis of the reference opening, and the second percentage can be in the range of 70-80%, adjusting the gas flow, thereby reducing the air pressure.

[0200] It should be noted that the valve stem and valve core in the electronic compensation and mechanical compensation are arranged at the inlet of the gas main pipe, i.e. upstream of the primary gas inlet 230, and the valve core is located in the gas main passage, and the valve stem is connected to the nonlinear spring, which is suitable for all combustion stages.

[0201] In some embodiments, the process of air pressure driving the diaphragm in the mechanical compensation system to expand can be implemented based on a diaphragm displacement-pressure model. In the diaphragm displacement-pressure model, the hyperparameters can be based on user customization or historical experience.

[0202] In this embodiment, the diaphragm displacement-pressure model can be represented as: ΔL = 0.15*(P^-0.7)-0.02%

[0203] Where ΔL represents the diaphragm displacement, in mm; P represents the pressure, in kPa. It should be noted that this model is suitable for the pressure range of 0.5-3 kPa.

[0204] In some embodiments, the spring is designed to be nonlinear, which can be represented as:

[0205] In the interval of 0-2 mm of diaphragm stroke, the spring stiffness is 5 N / mm;

[0206] In the interval of 2-4 mm of diaphragm stroke, the spring stiffness is 8 N / mm.

[0207] In some embodiments, the air pressure compensation based on the electronic compensation system and / or the mechanical compensation system includes:

[0208] In the case that the electronic compensation system is normal and the fluctuation value of the pressure data is less than the first threshold value, the electronic compensation system is used for air pressure compensation;

[0209] In the case that the electronic compensation system is normal and the fluctuation value of the pressure data is greater than or equal to the first threshold value, the electronic compensation system and the mechanical compensation system are used for air pressure compensation;

[0210] In the case of failure of the electronic compensation system, the mechanical compensation system is used for air pressure compensation.

[0211] According to the gas system control method provided in the embodiments of the present application, based on the state of the electronic compensation system and the range in which the fluctuation value of the pressure data is located, the system can select the electronic compensation, the mechanical compensation or the combination of the two to realize air pressure compensation, so that the system can maintain stable air-fuel ratio, improve the flexibility and accuracy of air pressure compensation, and in the case of failure of the electronic compensation system, can automatically switch to the mechanical compensation mode, improve the stability of system combustion, reduce the risk of flameout, thereby reducing the emission of harmful gases and improving the combustion thermal efficiency of the system.

[0212] The first threshold is used to judge the fluctuation amplitude of the gas pressure data, and when the fluctuation value of the pressure data reaches the first threshold, the electronic compensation system and the mechanical compensation system need to be enabled at the same time for air pressure compensation.

[0213] In this embodiment, the first threshold can be customized by the user or obtained based on historical experience; the pressure data can be obtained by a pressure sensor in the system.

[0214] In some embodiments, the determination of the judgment logic for using the electronic compensation system and / or for air pressure compensation can be represented as:

[0215]

[0216] In this embodiment, the function is_electronics_ok() is used to determine whether the electronic system fails, the first threshold is 0.1; the fluctuation value of the pressure data is variance, P1 is the pure electronic compensation mode, P2 is the electronic compensation + mechanical compensation auxiliary mode, and P3 is the pure mechanical compensation mode.

[0217] Table 3 below illustrates the judgment logic for executing electronic compensation and mechanical compensation in the above system.

[0218] Table 3

[0219]

[0220] In the case of determining that the electronic system fails, the mechanical compensation mode MECHANICAL_MODE is forced to be used for air pressure compensation, and the response time is less than 500s;

[0221] In the case of determining that the electronic compensation system is normal and the fluctuation value of the pressure data is greater than or equal to 0.1, the electronic compensation system and the mechanical compensation system dual mode HYBRID_MODE is used for air pressure compensation, and the response time is less than 200ms;

[0222] In the case that the electronic compensation system is determined to be normal and the fluctuation value of the pressure data is less than 0.1, the electronic compensation system is used for pressure compensation, and the response time is less than 100 ms.

[0223] In some embodiments, the working logic of the dual-mode pressure compensation using the electronic compensation system and the mechanical compensation system can include: when the system starts to start, the electronic compensation system and the mechanical compensation system start synchronously; in the case that the system startup time is less than or equal to 200 ms, the electronic compensation system is used for pressure compensation; in the case that the system startup time is greater than 200 ms, the electronic compensation system and the mechanical compensation system work together to perform pressure compensation.

[0224] In this embodiment, the logic of the electronic compensation system and the mechanical compensation system working together to perform pressure compensation can be expressed as:

[0225] float electronic_weight=1.0-(variance / MAX_VARIANCE);

[0226] float final_output=e_output*electronic_weight+

[0227] m_output*(1.0-electronic_weight);

[0228] Wherein, the electronic compensation weight electronic_weight is calculated based on the ratio of the fluctuation value variance of the pressure data to the maximum fluctuation value MAX_VARIANCE; the final output final_output is calculated by weighted average based on the electronic compensation output value e_output, the multiplication of the electronic compensation electronic_weight, and the mechanical compensation output value m_output, and is used to perform subsequent pressure compensation adjustment; the dual-mode pressure compensation of the electronic compensation system and the mechanical compensation system is realized based on the above logic.

[0229] The inventors found in the development process that in the related art, the existing combustion system uses a pressure compensation measure with slow response, low combustion thermal efficiency, and high emission of harmful gases.

[0230] In the present application, by acquiring the flame temperature, pressure and other combustion parameters in the combustion system, and combining with the control logic algorithm, the electronic compensation mode, the mechanical compensation mode or the combined dual-mode is used to adjust the air flow and the gas flow, thereby improving the accuracy of pressure compensation, reducing the emission of CO, and improving the combustion thermal efficiency.

[0231] In the case of determining that the electronic compensation system is normal and the fluctuation value of the pressure data is less than or equal to 0.1, the electronic compensation system is used for air pressure compensation, and the response time is less than 100 ms.

[0232] In some embodiments, determining that the electronic compensation system is normal can be expressed as code:

[0233]

[0234] Wherein, in the case of valid sensor status sensor_status, control system response time control_response_time less than 50 ms and voltage power supply voltage greater than 4.5 v, that is, in the case of meeting three conditions at the same time, it is determined that the electronic compensation system is normal; otherwise, it is determined that the electronic compensation system fails.

[0235] In some embodiments, the fluctuation value of the pressure data can be expressed as code:

[0236]

[0237] variance += fabs(prev_p[i+1]-prev_p[i]);

[0238] }

[0239] return variance / 4.0f; / / return average change rate (kPa / ms)

[0240] Wherein, the array prev_p saves the latest five times of pressure data; the absolute value of the difference between each pair of adjacent pressure values prev_p[i] and prev_p[i+1] in the array prev_p is calculated, and the absolute values of the differences are summed to obtain the sum variance of four times of pressure change; the average value obtained by dividing the sum variance of four times of pressure change by 4 is taken as the fluctuation value of the pressure data.

[0241] In some embodiments, the failure of the electronic compensation system means that due to sensor signal loss or communication interruption, sensor data out of range, sensor verification failure, etc., the electronic system cannot normally perform air pressure compensation work.

[0242] The following takes sensor signal loss or communication interruption, sensor data out of range, sensor verification failure and conflict with mechanical state as an example.

[0243] In the case of signal loss or communication interruption, such as due to magnet falling off, line circuit breaking and other failures: the duration of not detecting the Hall feedback signal of the valve core position is greater than 300 ms, I2 If the duration of no response of the MEMS pressure sensor on the C bus is greater than 100 ms or invalid data (such as check failure, timeout) is returned, it can be determined that the electronic system has failed;

[0244] If the sensor data is out of range, such as detecting a pressure less than 0.2 kPa due to sensor zero drift, detecting a pressure greater than 5 kPa due to pipeline rupture, or a change of > 3 kPa / ms between adjacent sampling periods due to signal interference, it can be determined that the electronic system has failed;

[0245] If the sensor check fails, such as a gas pressure sensor reading of 1.5 kPa and a flowmeter feedback gas flow value lower than the normal value, it can be determined that the electronic system has failed.

[0246] In the case of conflict with the mechanical state, such as the electronic system controlling the valve core opening degree to be 50%, but the Hall element detecting the actual opening degree of the valve core to be less than 30% and the actual opening degree state lasting for 200 ms, indicating that the actuator is stuck, it can be determined that the electronic system has failed.

[0247] In actual implementation, the process and recovery of the failure process can be represented as follows: in the case of failure of the electronic compensation system, an alarm is triggered and the mechanical compensation system is automatically connected to perform pressure compensation; the failure is recorded and, in the case of recovery of the electronic system, the electronic compensation mode is automatically switched back.

[0248] The following will be described with reference to a certain process and recovery of the failure process.

[0249] Reference Figure 5 If it is detected that a click stall occurs and the current lasts more than 1.2 A and the duration reaches 0.5 s, the system determines that there is a risk of failure, and then sends three reverse pulses to attempt to restore the normal state; if the failure is restored after three reverse pulse processes, the process ends; if it cannot be restored, the system records the failure code F001 and switches to mechanical mode operation, and triggers an audible and light alarm to prompt the user that the device has entered a degraded working state.

[0250] It should be noted that although the mechanical compensation system can maintain the basic pressure compensation function, the electronic system needs to be repaired as soon as possible until the electronic system is restored to normal, and the electronic compensation mode is automatically switched back.

[0251] In some embodiments, before performing pressure compensation based on the electronic compensation system and / or the mechanical compensation system, the following can also be included:

[0252] In the system startup phase, the electronic compensation mode is entered by default for pressure compensation.

[0253] In this embodiment, the pressure sensor needs to be calibrated during the system startup phase to avoid the influence of errors.

[0254] In some embodiments, pressure compensation based on an electronic compensation system and / or a mechanical compensation system may further include:

[0255] In the event of an emergency protection system being activated, a mechanical compensation system is used to compensate for the air pressure.

[0256] According to the control method of the combustion system provided in the embodiments of this application, staged combustion is achieved by controlling the gas input in the primary combustion module and the secondary combustion module of the combustion system, which improves the accuracy of gas pressure compensation in the system, so that the unburned gas, air and gas in the system are fully mixed and burned, thereby reducing the emission of harmful gases and improving the combustion thermal efficiency.

[0257] In some embodiments, controlling the input of fuel gas into the secondary combustion module includes:

[0258] To obtain the gas concentration of the incompletely combusted gas;

[0259] Based on the gas concentration, adjust the damper opening at the secondary air inlet 250 to achieve the target ratio of gas concentration to air concentration.

[0260] refer to Figure 6 In this embodiment, the concentration of the incompletely combusted gas refers to the concentration of CO. Since the main component of the incompletely combusted gas is CO, the opening of the damper of the secondary air inlet 250 is adjusted based on the CO gas concentration to control the input secondary air, so that the incompletely combusted gas, fuel gas and air are mixed and fully combusted in the secondary combustion zone 240. The chemical formula for the combustion of unburned gas in the secondary combustion zone can be expressed as: 2CO + O2 → 2CO2.

[0261] The target ratio can be based on user-defined criteria or obtained based on historical experience; in some embodiments, the target ratio can be in the range of 1.1 to 1.3.

[0262] In some embodiments, adjusting the damper opening (e.g., baffle opening) of the secondary air inlet 250 based on the gas concentration to achieve a target ratio of gas concentration to air concentration can be expressed as:

[0263] float calc_damper_angle(float CO_ppm){

[0264] float base_angle = 45.0f; / / Base angle

[0265] if (CO_ppm > 30.0f) {

[0266] return base_angle + 0.5f * (CO_ppm - 30.0f); / / Increase by 5° for every 10ppm increase.

[0267] }

[0268] return base_angle;

[0269] In this embodiment, the base angle of the baffle is set to 45.0°. When the detected CO concentration value CO_ppm is greater than 30.0ppm, the product of the excess CO concentration value and the adjustment coefficient 0.5 is calculated, and this product is added to the base angle to obtain the corrected baffle opening as the output. When the detected CO concentration value CO_ppm is less than or equal to 30.0ppm, the base angle is directly used as the baffle opening. Based on the above calculation results, the baffle angle is controlled to adjust the opening of the damper at the secondary air inlet 250 to adjust the airflow so that the ratio of gas concentration to air concentration reaches the target ratio.

[0270] In some embodiments, adjusting the damper opening of the secondary air inlet 250 based on the gas concentration includes:

[0271] If the CO concentration parameter in the incompletely combusted gas is less than the first target concentration threshold, the control system maintains the current damper opening of 250 at the secondary air inlet.

[0272] When the CO gas concentration parameter in the incompletely combusted gas is greater than or equal to the first target concentration threshold and less than or equal to the second target concentration threshold, the damper opening of the secondary air inlet 250 of the control system is the first target opening.

[0273] When the CO concentration in the incompletely combusted gas is greater than the second target concentration threshold, the damper opening of the secondary air inlet 250 of the control system is the second target opening.

[0274] According to the control method of the combustion system provided in the embodiments of this application, the system dynamically adjusts the opening of the secondary air damper based on the CO concentration parameter, and realizes graded adjustment of air flow according to different CO concentrations, so that the incompletely combusted gas is fully mixed and combusted with air, thereby reducing the emission of harmful gases and improving the combustion thermal efficiency of the system.

[0275] In this embodiment, the first target concentration threshold, the second target concentration threshold, the first target opening degree, and the second target opening degree can all be customized by the user or obtained based on historical experience.

[0276] refer to Figure 6The CO gas concentration parameter can be obtained by an infrared CO sensor. The range of the infrared CO sensor can be set to 0-1000 ppm, and the measurement accuracy can be set to ±5 ppm.

[0277] Reference Figure 3 The following is an example of adjusting the damper opening degree of the secondary air inlet 250 based on the CO gas concentration obtained by the CO sensor.

[0278] In the case where the CO gas concentration parameter is less than 30 ppm, the secondary air damper maintains the current opening degree;

[0279] In the case where the CO gas concentration parameter is greater than or equal to 30 ppm and less than or equal to 50 ppm, the opening degree of the secondary air damper is increased linearly, for example, for every 10 ppm increase in CO gas concentration, the opening degree of the secondary air damper is increased by 5% based on the last opening degree, and the response time of this adjustment measure is less than 2 s;

[0280] In the case where the CO gas concentration parameter is greater than 50 ppm, the opening degree of the secondary air damper is adjusted to full opening and an alarm is triggered, and this adjustment measure is executed immediately.

[0281] In this embodiment, the adjustment logic of the secondary air damper can be specifically represented as:

[0282]

[0283] wherein CO_ppm represents the CO gas concentration parameter, and angle represents the damper opening degree.

[0284] The damper opening degree angle is initially set to 30°; in the case where the CO gas concentration parameter CO_ppm is greater than 30 ppm, the difference between the CO gas concentration parameter CO_ppm and 30 ppm is calculated, and the product of the difference and the proportional coefficient 0.5f is added to the damper opening degree angle; in the case where the calculated damper opening degree angle is less than 30° or greater than 55°, the damper opening degree angle is limited within this interval to avoid too small or too large damper opening degree; the limited damper opening degree angle is sent to the damper actuator set_damper_angle to realize the adjustment of the opening degree of the secondary air damper.

[0285] The following Table 4 illustrates the judgment logic for damper action based on CO concentration in the system.

[0286] Table 4

[0287] CO concentration (ppm) Damper action Response time <30 Maintain current opening \ 30-50 Linearly increase opening (5° / 10 ppm) <2s >50 Fully open (55°) + alarm Immediately execute

[0288] In some embodiments, the system can achieve the adjustment of the secondary air door based on the CO concentration through CO-PID closed-loop control logic, in which: the proportional coefficient term Kp is set to 0.8, which can quickly respond to the deviation of the CO concentration parameter, such as immediately increasing the air door when the CO concentration parameter exceeds 30 ppm; the integral coefficient Ki is set to 0.1, which can eliminate the steady-state error, such as slowly adjusting the air door opening degree of the system when the CO is slightly over the standard for a long time.

[0289] In some embodiments, step 120 can further include:

[0290] Based on the temperature and CO conversion rate, combined with catalyst-assisted secondary afterburning (i.e., catalyst replacement prompt).

[0291] In some embodiments, the relationship between temperature and CO conversion rate can be expressed as:

[0292] When the temperature is less than 400°C, the CO conversion rate is less than 80%;

[0293] When the temperature is in the range of 450±50°C, the CO conversion rate is greater than or equal to 95%;

[0294] When the temperature is greater than 650°C, the risk of catalyst sintering increases.

[0295] It should be noted that the catalytic reaction in the secondary combustion zone 240 achieves the best effect when the temperature is in the range of 400-600°C.

[0296] When the secondary afterburning operation time is greater than 1000h, the CO conversion rate decreases from 95% to 93%, and the activity decay rate of the catalyst is 2.1%;

[0297] When the secondary afterburning operation time is greater than 2000h, the CO conversion rate decreases from 93% to 90%, and the activity decay rate of the catalyst is 5.3%.

[0298] The following Table 5 illustrates the relationship between the activity decay rate of the catalyst and the operation time and CO conversion rate.

[0299] Table 5

[0300] Running time (h) CO conversion rate (%) Activity decay rate 0 95 - 1000 93 2.1％ 2000 90 5.3％

[0301] In actual execution, the triggering conditions of the catalyst replacement prompt can include:

[0302] When the CO concentration parameter is greater than 40 ppm and the temperature is greater than 500°C, the CO concentration exceeds the standard (the normal CO concentration should be less than or equal to 30 ppm), indicating that the catalytic efficiency has decreased; the temperature in the afterburning zone is too high, and high temperature can accelerate the sintering of the catalyst; and when the CO conversion rate is less than 85%.

[0303] During the research and development process, the inventors discovered that in the relevant technologies, the secondary combustion is mainly assisted by Fe-Cr catalyst. When the secondary combustion operation time is greater than 1000h, the CO conversion rate decreases from 85% to 80%; when the secondary combustion operation time is greater than 2000h, the CO conversion rate decreases from 80% to 75%, and the activity decay rate of Fe-Cr catalyst is 11.8%.

[0304] In this application, a Pd-Pt catalyst is used to assist secondary combustion. When the secondary combustion operation time is greater than 1000h, the CO conversion rate decreases from 95% to 93%; when the secondary combustion operation time is greater than 2000h, the CO conversion rate decreases from 93% to 90%, and the activity decay rate of the Pd-Pt catalyst is 5.3%.

[0305] Table 6 below illustrates the relationship between the effects of conventional Fe-Cr catalyst and the Pd-Pt catalyst of this invention on CO conversion, operating time, and decay rate.

[0306] Table 6

[0307]

[0308] Based on the comparison of CO conversion rate and catalyst activity as described above, the catalyst used in this application exhibits a lower decay rate and maintains a higher CO conversion rate during the assisted secondary combustion process.

[0309] In some embodiments, the control logic for secondary combustion, based on the gas concentration, adjusts the damper opening (e.g., the baffle opening) of the secondary air inlet 250 to achieve a target ratio of gas concentration to air concentration. This control logic, combined with the catalyst, can be expressed as follows:

[0310] float calc_damper_angle(float CO_ppm){

[0311] float base_angle = 45.0f; / / Base angle

[0312] if (CO_ppm > 30.0f) {

[0313] return base_angle + 0.5f * (CO_ppm - 30.0f); / / Increase by 5° for every 10ppm increase.

[0314] }

[0315] return base_angle;

[0316] In this embodiment, the base angle of the baffle is set to 45.0°;

[0317] In the case where the detected CO concentration value CO ppm is greater than 30.0 ppm, the product of the excess part of the CO concentration value and the adjustment coefficient 0.5 is calculated, and the product is added to the base angle base_angle to obtain the increased baffle angle as the output; in the case where the detected CO concentration value CO ppm is less than or equal to 30.0 ppm, the base angle base_angle is directly used as the baffle angle; based on the calculation result, the baffle angle is controlled to adjust the damper opening of the secondary air inlet 250 to adjust the air flow, so that the ratio of the gas concentration and the air concentration reaches the target ratio.

[0318] In some embodiments, steps 110 and 120 can further include:

[0319] Obtaining flame signal, CO concentration parameter and air pressure data;

[0320] Based on at least one of the flame signal, the CO concentration parameter and the air pressure data, determining to trigger the system emergency protection.

[0321] In some embodiments, the determination to trigger the system emergency protection can be realized by a master control chip, for example, a master control chip of model STM32F407VG with FPU floating point operation.

[0322] In some embodiments, the priority of triggering the system emergency protection from high to low is in turn: gas leakage, flame extinguishing, carbon monoxide (CO) concentration exceeding and air pressure anomaly. Among them, for gas leakage, the response time is less than 100 ms; for flame extinguishing, the response time is less than 300 ms; for CO exceeding, the response time is less than 2 s; for air pressure anomaly, the response time is less than 5 s.

[0323] In this embodiment, the flame signal can include flame temperature, UV signal frequency and ion current, etc., which can be obtained by a UV flame detector with a response wavelength in the range of 200-280 mm; the CO concentration can be obtained by an infrared CO sensor with a range of 0-1000 ppm and a measurement accuracy of ± 5 ppm; the air pressure data can be obtained by an air pressure sensor.

[0324] The following Table 7 illustrates the priority order of the system triggering protection based on fault type.

[0325] Reference Figure 7 In some embodiments, the process of determining to trigger the system emergency protection based on the flame signal can include:

[0326] Detecting whether the flame signal exists or detecting the ion current, such as in the case of UV signal loss duration greater than or equal to 200 ms, ion current less than 1 μA and duration greater than 300 ms, the system immediately executes the flameout protection: first close the main gas valve within 300 ms, start the audible and visual alarm, and issue a warning through an 85 dB buzzer and RGB LED; enter the locked state until manual reset;

[0327] Detecting the frequency stability of the flame signal, such as in the case of UV signal frequency stability in the range of 8-12 Hz, it is determined to be a normal combustion state; in the case of UV signal frequency less than 5 Hz or greater than 20 Hz, it is determined to be unstable combustion, and the system triggers the damper adjustment;

[0328] Detecting whether the flame temperature is in the normal range, such as in the case of flame temperature less than 300℃ or greater than 1000℃, the system should cut off the gas source and use pure mechanical compensation.

[0329] Table 7

[0330] Priority Fault type Response speed 1 Gas leakage <100 ms 2 Flame extinguishing <300 ms 3 CO over standard ＜2s 4 Gas pressure anomaly <5s

[0331] In some embodiments, in the process of determining whether to trigger the system emergency protection based on the CO concentration parameter and the gas pressure data, the case of detecting that the gas pressure decreases too quickly can include:

[0332] In the case of pressure change rate greater than 3 kPa / s, the system controls the mechanical valve to open to 120% of the original reference opening within 0.5 s, and the electronic compensation system executes gas pressure compensation to 125% of the original reference gas pressure within 1.0 s;

[0333] In the case of CO concentration parameter greater than 50 ppm and duration greater than or equal to 2 seconds, the system controls the opening of the secondary damper to 55°.

[0334] Reference Figure 3 In the process of executing safety protection, based on the flame signal, CO concentration parameter and power supply voltage, triggering emergency protection includes:

[0335] In the case of flame temperature greater than 1000℃ or less than 300℃, or CO concentration greater than or equal to 50 ppm and duration greater than or equal to 200 ms, or power supply voltage less than 3.3V, the following steps are executed to realize mode switching:

[0336] Immediately start mechanical actuator preloading; electronic compensation gradually retires, mechanical compensation gradually enters, delay time is 20 ms; the system executes hard cut-off of the gas source, and fully opens the mechanical compensation, with a delay time less than 5 ms.

[0337] According to the control method of the combustion system provided in the embodiment, the system can be more comprehensively judged whether in normal state by acquiring multiple state parameters such as flame signal, CO concentration parameter and power supply voltage. When detecting system failure, the multi-mode switching strategy is adopted to ensure safe operation of the system, and the safety alarm is triggered when necessary, so as to improve the combustion stability, safety and system response speed.

[0338] Table 8 below illustrates the execution logic of switching compensation mode after triggering emergency protection in the system.

[0339] Table 8

[0340]

[0341] In some embodiments, the cooperative workflow of steps 110 and 120 can include:

[0342] In the system startup phase, the igniter triggers the flame of the combustion zone 210 once, and the gas pressure supplement valve is initialized to the corresponding opening degree when the gas pressure is 1 Kpa;

[0343] In the system running phase, when the gas pressure fluctuates, the supplement valve adjusts the gas flow, and the CO sensor feedback controls the secondary air door opening degree.

[0344] Table 9 below illustrates the relationship between the execution action of the system and the success determination standard and time.

[0345] Table 9

[0346] Time Action Success judgment standard 0-100 ms Ignition pulse (15 kV, 2 ms) Ion current > 2 μA 100-300 ms Slowly open gas valve to 70% Pressure rise slope < 5 kPa / s 300-500 ms Pre-open secondary air damper to 30° [O2 concentration > 18%]

[0347] In this embodiment, the cooperative workflow of steps 110 and 120 can further include:

[0348] In the case of ion current greater than 2 μA, the system performs ignition pulse with peak voltage 15 kV and pulse time lasting 2 ms, and the response time is less than 100 ms;

[0349] In the case of pressure rising slope less than 5 kPa / s, the system controls the slow opening of the electronic compensation system, such as the slow opening of the gas valve to 70% of the original reference opening, the step angle adjustment of the stepper motor to 0.1°, and adjusts the gas flow in combination with the feedforward compensation formula, and the response time is less than 300 ms;

[0350] In the case of oxygen concentration ratio greater than or equal to 18%, the system controls the secondary air door opening degree to 30°, so that the response time is less than 500 ms.

[0351] Among them, the gas pressure sensor is sampled every 100 ms; the CO concentration is updated every 200 ms; and the system self-check is performed every 500 ms.

[0352] The embodiment of the present application also provides a combustion system, comprising:

[0353] The primary combustion module inhales air through the primary air inlet 220;

[0354] The secondary combustion module, the primary combustion module and the secondary combustion module exchange gas through the guide vane, and the secondary combustion module inhales air through the secondary air inlet 250;

[0355] The control module is used for executing the control method of the combustion system as in any of the above embodiments to control the combustion system.

[0356] In some embodiments, the primary combustion module comprises:

[0357] The primary gas inlet;

[0358] The primary combustion area;

[0359] The primary air inlet 220 connected between the primary gas inlet and the primary combustion area;

[0360] The secondary combustion module comprises:

[0361] The secondary gas inlet;

[0362] The secondary combustion area;

[0363] The secondary air inlet 250 connected between the secondary gas inlet and the secondary combustion area.

[0364] Table 10 below shows the comparison of the conventional single-stage combustion stove and the combustion system of the present application in multiple same indicators under the same test conditions.

[0365] In this embodiment, under the condition that the air pressure is 1.0 kPa and the ambient temperature is 25℃, the thermal efficiency of the existing single-stage combustion stove is less than or equal to 68%, and the gas stove provided by the embodiment of the present application can improve the thermal efficiency by at least 12%, i.e., the thermal efficiency is greater than or equal to 75%;

[0366] Under the condition stipulated in Clause 5.2.3 of the standard GB 16410-2020, the CO emission of the existing single-stage combustion stove is within the range of 0.05%+15%, and the CO emission frequently exceeds the standard. The CO emission of the gas stove provided by the embodiment of the present application is within the range of 0.05%+15%, and can stably meet the standard;

[0367] In the case of simulating 0.5kPa low pressure environment, the minimum working pressure of the existing single-stage combustion cooker is greater than or equal to 1.0kPa, and the problem of easy extinguishing occurs in high-rise residential use. The minimum working pressure of the gas stove provided by the embodiment of the present application is 0.5kPa, which is suitable for gas peak conditions;

[0368] In the case of load mutation test, such as gas pressure change rate of 2kPa / s, the response time of the existing single-stage combustion gas pressure compensation system is 3s, the response time of the electronic compensation system of the gas stove provided by the embodiment of the present application is less than 100ms, and the response time of the mechanical compensation system is less than 500ms.

[0369] In the case of secondary combustion zone temperature of 450℃, the NOx emission concentration of the existing single-stage combustion cooker will be greater than 50ppm due to high temperature combustion, and the NOx emission concentration of the gas stove provided by the embodiment of the present application is reduced to less than or equal to 30ppm due to secondary catalysis.

[0370] Table 10

[0371]

[0372] The control method of the combustion system provided by the embodiment of the present application, the execution subject can be the control device of the combustion system. In the embodiment of the present application, the control method of the combustion system is taken as an example to illustrate the control device of the combustion system provided by the embodiment of the present application.

[0373] The embodiment of the present application also provides a control device of a combustion system.

[0374] As shown in Figure 8 The control device of the combustion system comprises: a first processing module 810 and a second processing module 820.

[0375] The first processing module 810 is used to control the input of fuel gas into the primary combustion module, so that the fuel gas is mixed with air in the primary combustion module and burns, and the unburned gas enters the secondary combustion module through the guide fin;

[0376] The second processing module 820 is used to control the input of fuel gas into the secondary combustion module, so that the fuel gas is mixed with the unburned gas in the secondary combustion module and the air in the secondary combustion module and burns.

[0377] According to the control device of the combustion system of the present application, by controlling the input of fuel gas in the primary combustion module and the secondary combustion module in the combustion system, the accuracy of gas pressure compensation in the system is improved, so that the unburned gas, air and fuel gas in the system are fully mixed and burned, thereby reducing the emission of harmful gas and improving the combustion heat efficiency of the system.

[0378] In some embodiments, the second processing module 820 can be further configured to:

[0379] obtain a gas concentration of the unburnt gas;

[0380] adjust the damper opening degree of the secondary air inlet 250 based on the gas concentration to make the ratio of the gas concentration and the air concentration reach a target ratio.

[0381] In some embodiments, the second processing module 820 can be further configured to:

[0382] maintain the current damper opening degree of the secondary air inlet 250 when the CO gas concentration parameter in the unburnt gas is less than the first target concentration threshold;

[0383] adjust the damper opening degree of the secondary air inlet 250 to the first target opening degree when the CO gas concentration parameter in the unburnt gas is greater than or equal to the first target concentration threshold and less than or equal to the second target concentration threshold;

[0384] adjust the damper opening degree of the secondary air inlet 250 to the second target opening degree when the CO gas concentration in the unburnt gas is greater than the second target concentration threshold.

[0385] In some embodiments, the first processing module 810 can be further configured to:

[0386] obtain a gas flow rate in the primary air inlet 220;

[0387] adjust at least one of the damper opening degree of the secondary air inlet 250 and the air inlet valve opening degree of the primary combustion module based on the gas flow rate.

[0388] In some embodiments, the first processing module 810 can be further configured to:

[0389] adjust the damper opening degree of the secondary air inlet 250 when the gas flow rate is less than a first flow rate threshold and greater than or equal to a second flow rate threshold;

[0390] adjust the damper opening degree of the secondary air inlet 250 and the air inlet valve opening degree of the primary combustion module when the gas flow rate is less than the second flow rate threshold and greater than a third flow rate threshold;

[0391] adjust the air inlet valve opening degree of the primary combustion module when the gas flow rate is less than the third flow rate threshold;

[0392] The first flow rate threshold is greater than the second flow rate threshold and greater than the third flow rate threshold; and the second flow rate threshold is greater than the third flow rate threshold.

[0393] In some embodiments, the apparatus can further comprise a third processing module configured to:

[0394] acquiring pressure data at the gas inlet of the primary combustion module and the secondary combustion module;

[0395] maintaining the current intake valve opening degree unchanged when it is determined that the pressure is normal based on the pressure data;

[0396] controlling air pressure compensation when it is determined that the pressure is abnormal based on the pressure data.

[0397] In some embodiments, the third processing module can be further configured to:

[0398] performing air pressure compensation based on the electronic compensation system and / or the mechanical compensation system.

[0399] In some embodiments, the third processing module can be further configured to:

[0400] performing air pressure compensation by using the electronic compensation system when the electronic compensation system is normal and the fluctuation value of the pressure data is less than a first threshold value;

[0401] performing air pressure compensation by using the electronic compensation system and the mechanical compensation system when the electronic compensation system is normal and the fluctuation value of the pressure data is greater than or equal to the first threshold value;

[0402] performing air pressure compensation by using the mechanical compensation system when the electronic compensation system fails.

[0403] The control device of the combustion system in the embodiments of the present application can be an electronic device, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or other devices other than a terminal. For example, the electronic device can be a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted electronic device, a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc. The electronic device can also be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc. The embodiments of the present application are not limited in this regard.

[0404] The control device of the combustion system in the embodiments of the present application can be a device with an operating system. The operating system can be an Android operating system, an IOS operating system, or other possible operating systems, and the embodiments of the present application do not make specific limitations.

[0405] The control device of the combustion system provided in the embodiments of the present application can realize Figure 1 to Figure 7 The processes realized by the method embodiments are not repeated here to avoid repetition.

[0406] In some embodiments, as shown in Figure 9 The embodiments of the present application also provide an electronic device 900, which includes a processor 901, a memory 902, and a computer program stored in the memory 902 and capable of running on the processor 901. When the program is executed by the processor 901, the processes of the above-mentioned control method embodiments of the combustion system are realized, and the same technical effects are achieved. To avoid repetition, the processes are not repeated here.

[0407] It should be noted that the electronic device in the embodiments of the present application includes the mobile electronic device and the non-mobile electronic device described above.

[0408] The embodiments of the present application also provide a non-transitory computer readable storage medium, which stores a computer program. When the computer program is executed by a processor, the processes of the above-mentioned control method embodiments of the combustion system are realized, and the same technical effects are achieved. To avoid repetition, the processes are not repeated here.

[0409] The processor is the processor in the electronic device described in the above-mentioned embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0410] The embodiments of the present application also provide a computer program product, which includes a computer program. When the computer program is executed by a processor, the control method of the combustion system is realized.

[0411] The processor is the processor in the electronic device described in the above-mentioned embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0412] The embodiments of the present application also provide a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to realize the processes of the above-mentioned control method embodiments of the combustion system, and the same technical effects are achieved. To avoid repetition, the processes are not repeated here.

[0413] It should be understood that the chip mentioned in the embodiments of the present application can also be referred to as a system-level chip, a system chip, a chip system, or a system-on-chip chip, etc.

[0414] It should be noted that in this document, the terms "comprise", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles, or devices that comprise a series of elements not only include those elements, but also include other elements not explicitly listed, or further include elements inherent to such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article, or device that includes the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to the order of performing the functions as shown or discussed, but can also include performing the functions in a substantially simultaneous manner or in reverse order, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0415] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment method can be realized by means of software and the necessary general hardware platform, of course, it can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including a plurality of instructions for making a terminal (which can be a mobile phone, computer, server, or network equipment, etc.) execute the method described in each embodiment of the present application.

[0416] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative, not limiting, and those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

[0417] In the description of the application, reference has been made to descriptive terms such as "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. It is emphasized that each of these terms refers to a specific feature, structure, material or characteristic described in connection with a particular embodiment or example. The descriptive terms are not necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0418] While the embodiments of the application have been shown and described, it is to be understood that the embodiments described are only by way of example and that various changes, modifications, substitutions and alterations can be made thereto without departing from the spirit and scope of the application as set forth in the claims and equivalents thereof.

Claims

1. A control method of a combustion system, characterized by, The combustion system comprises a primary combustion module and a secondary combustion module, gas exchange is carried out between the primary combustion module and the secondary combustion module through a guide vane, the primary combustion module inhales air through a primary air inlet, and the secondary combustion module inhales air through a secondary air inlet; the method comprises: controlling the input of fuel gas into the primary combustion module to make the fuel gas burn with the air in the primary combustion module, and the unburned gas enters the secondary combustion module through the guide vane; controlling the input of fuel gas into the secondary combustion module to make the fuel gas burn with the unburned gas in the secondary combustion module and the air in the secondary combustion module.

2. The control method of a combustion system according to claim 1, characterized by, The control of the input of fuel gas into the secondary combustion module comprises: obtaining the gas concentration of the unburned gas; based on the gas concentration, adjusting the damper opening degree of the secondary air inlet to make the ratio of fuel gas concentration and air concentration reach a target ratio.

3. The control method of a combustion system according to claim 2, characterized by, The adjustment of the damper opening degree of the secondary air inlet based on the gas concentration comprises: in the case that the CO gas concentration parameter in the unburned gas is less than a first target concentration threshold, controlling the system to maintain the current damper opening degree of the secondary air inlet; in the case that the CO gas concentration parameter in the unburned gas is greater than or equal to the first target concentration threshold and less than or equal to a second target concentration threshold, controlling the damper opening degree of the secondary air inlet of the system to be a first target opening degree; in the case that the CO gas concentration in the unburned gas is greater than the second target concentration threshold, controlling the damper opening degree of the secondary air inlet of the system to be a second target opening degree.

4. The method of controlling a combustion system according to any one of claims 1-3, wherein, The control of the input of fuel gas into the primary combustion module comprises: obtaining the gas flow rate in the primary air inlet; based on the gas flow rate, adjusting at least one of the damper opening degree of the secondary air inlet and the intake valve opening degree of the primary combustion module.

5. The control method of a combustion system according to claim 4, characterized by, The adjustment of at least one of the damper opening degree of the secondary air inlet and the intake valve opening degree of the primary combustion module based on the gas flow rate comprises: in the case that the gas flow rate is less than a first flow rate threshold and greater than or equal to a second flow rate threshold, adjusting the damper opening degree of the secondary air inlet; in the case that the gas flow rate is less than the second flow rate threshold and greater than a third flow rate threshold, adjusting the damper opening degree of the secondary air inlet and the intake valve opening degree of the primary combustion module; in the case that the gas flow rate is less than the third flow rate threshold, adjusting the intake valve opening degree of the primary combustion module; the first flow rate threshold is greater than the second flow rate threshold and greater than the third flow rate threshold; the second flow rate threshold is greater than the third flow rate threshold.

6. The control method according to any one of claims 1 to 3, characterized by, Before the control of the input of fuel gas into the primary combustion module, the method further comprises: obtaining pressure data at the fuel gas inlet in the primary combustion module and the secondary combustion module; in the case that the pressure is determined to be normal based on the pressure data, maintaining the current intake valve opening degree unchanged; in the case that the pressure is determined to be abnormal based on the pressure data, controlling to carry out air pressure compensation.

7. The control method of a combustion system according to claim 6, characterized by, The combustion system further comprises an electronic compensation system and a mechanical compensation system; the control performs air pressure compensation, comprising: performing air pressure compensation based on the electronic compensation system and / or the mechanical compensation system.

8. The control method of a combustion system according to claim 7, characterized by, The air pressure compensation based on the electronic compensation system and / or the mechanical compensation system comprises: when the electronic compensation system is normal and the fluctuation value of the pressure data is less than a first threshold value, performing air pressure compensation by the electronic compensation system; when the electronic compensation system is normal and the fluctuation value of the pressure data is greater than or equal to the first threshold value, performing air pressure compensation by the electronic compensation system and the mechanical compensation system; when the electronic compensation system fails, performing air pressure compensation by the mechanical compensation system.

9. A combustion system characterized by, Comprise: a primary combustion module, which sucks in air through a primary air inlet; a secondary combustion module, which exchanges gas with the primary combustion module through a guide fin, and sucks in air through a secondary air inlet; a control module, which is used to execute the control method of the combustion system as claimed in any one of claims 1 to 8.

10. The combustion system control method according to claim 9, characterized by, The primary combustion module comprises: a primary gas inlet; a primary combustion area; a primary air inlet connected between the primary gas inlet and the primary combustion area; The secondary combustion module comprises: a secondary gas inlet; a secondary combustion area; a secondary air inlet connected between the secondary gas inlet and the secondary combustion area.

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