Full premix surface burner flame partition monitoring burner tip and method

Abstract

This invention discloses a flame zoning monitoring burner head and method for a fully premixed surface burner, belonging to the field of burner safety protection and monitoring technology. In this burner head, multiple burners are spaced apart and sleeved on the outside of a support cylinder, forming multiple annular spaces corresponding to the support cylinder. Multiple insulating rings are fixed on the outside of the support cylinder and distributed at the intervals between axially adjacent burners, at the rear end of the last axially adjacent burner, and at the front end of the first axially adjacent burner, to insulate the multiple burners from the support cylinder and between axially adjacent burners. Multiple sets of ion probes extend axially towards the front end between the support cylinder and the burners to the corresponding burners and are fixed to the insulating rings they pass through. The front section of the metal needle of the multiple sets of ion probes passes through the inner side of the corresponding burner to the outer surface of the burner. This invention can effectively prevent backfire and improve burner safety.

Description

Technical Field

[0001] This invention relates to the field of burner safety protection and monitoring technology, and in particular to a flame zone monitoring head and method for a fully premixed surface burner. Background Technology

[0002] Blending natural gas with hydrogen helps promote the transformation of the energy structure and the development of hydrogen production from renewable energy sources, making it an effective means to achieve the "dual carbon" goal. Fully premixed surface combustion technology boasts high combustion efficiency and low pollutant emissions, making it an effective method for achieving clean combustion of hydrogen-blended natural gas. However, blending natural gas with hydrogen alters its combustion characteristics. When using a fully premixed surface burner, the flame will be closer to the burner surface, increasing the risk of backfire. Therefore, when using a fully premixed surface burner with hydrogen-blended natural gas, flame detection at the burner surface must be established to prevent backfire.

[0003] The existing flame detector and burner of the fully premixed surface burner are two independent components. It can only detect the flame outside the burner to determine whether combustion has occurred, but cannot provide flame detection on the burner surface or provide backfire warning. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a flame zone monitoring head and method for a fully premixed surface burner, which can effectively prevent backfire and improve burner safety.

[0005] According to a first aspect embodiment of the present invention, a fully premixed surface burner flame zone monitoring burner head includes: A zoned combustion module includes a support cylinder, multiple burners, and multiple insulating rings. The multiple burners are spaced apart from the axial rear end to the axial front end of the support cylinder, forming multiple annular spaces corresponding to the support cylinder. The multiple insulating rings are fixed to the support cylinder and distributed at the intervals between axially adjacent burners, at the rear end of the last axial burner, and at the front end of the first axial burner, supporting the ends of the corresponding burners to insulate the multiple burners from the support cylinder and from axially adjacent burners. The axial rear end of the support cylinder is used to introduce a premixed gas mixture of air and fuel gas, and the axial front end of the support cylinder is closed. Ventilation holes are distributed on the cylinder wall radially opposite to the burners. The partition monitoring module includes multiple sets of ion probes. The multiple sets of ion probes extend axially towards the front end between the support cylinder and the burner to the corresponding burners and are fixed to the insulating rings they pass through. The front section of the metal needle of the multiple sets of ion probes passes through the burner from the inside to the outer surface of the burner. The multiple sets of ion probes and the outer surfaces of the multiple burners form an integrated monitoring system.

[0006] The working principle of the flame zone monitoring burner head of the fully premixed surface burner according to the first aspect of the present invention is as follows: The premixed air and fuel gas mixture is introduced into the support cylinder from the axial rear end of the support cylinder, and enters the annular space between each burner and the support cylinder through the vent holes on the cylinder wall; since the axial ends of each annular space are sealed by corresponding insulating rings, the mixture in each annular space diffuses to the outside of each burner through the pores of each burner, resulting in fully premixed surface combustion; multiple sets of ion probes monitor the combustion status at multiple burners. If the ion probe does not generate a feedback signal, the combustion at the corresponding burner is normal, and the flame is close to the outer surface of the corresponding burner, but does not contact the outer surface of the corresponding burner; if the ion probe generates a feedback signal, such as an intermittent weak signal or a strong signal, the combustion at the corresponding burner is abnormal, and the flame is in contact with the outer surface of the burner or burning inside the burner. At this time, the magnitude of the feedback signal value is used to determine whether it exceeds the threshold, and a backfire warning signal is issued, wherein the threshold can be adjusted according to different operating conditions. Because each burner is insulated and separated by a corresponding insulating ring, zoned combustion is achieved in the fully premixed surface burner. Multiple sets of ion probes extend axially towards the front end between the support cylinder and the burners, reaching the corresponding burners and being fixed to their respective insulating rings. The front sections of the metal needles of these ion probes pass through the inner side of the corresponding burners to their outer surface, enabling zoned flame monitoring of the fully premixed surface burner. Furthermore, each set of ion probes and its corresponding burner are monitored as a single unit. The combustion status at the corresponding burner is determined based on the feedback signal intensity of each set of ion probes. This not only effectively prevents backfire but also effectively detects the flame distribution in the combustion zones of each burner, adjusting the flame distribution across multiple zones for safe and stable operation of the combustion equipment.

[0007] The flame zoning monitoring burner head of the fully premixed surface burner according to the first aspect of the present invention has the following advantages: On the one hand, it realizes zoning combustion and flame zoning monitoring of the fully premixed surface burner. Each set of ion probes and corresponding burners can monitor in real time whether there is a combustion flame on the outer surface or inside of each burner. In particular, it can capture the flame state on the outer surface of the burner in real time and issue an early warning before backfire occurs. By isolating adjacent burners and the burner and support cylinder through insulating rings, the ion currents of flames in different zones are prevented from interfering with each other, ensuring the accuracy of ion probe signals and accurate monitoring. Zoning monitoring of multiple burners corresponding to multiple sets of ion probes can accurately locate abnormal combustion zones. Therefore, the flame zoning monitoring burner head of the fully premixed surface burner according to the first aspect of the present invention can effectively prevent backfire and improve the safety of the burner. On the other hand, through zoning monitoring, the flame distribution of the combustion zone of each burner can be effectively detected, and the flame distribution in multiple zones can be adjusted to be uniform, so that the combustion equipment can operate safely and stably.

[0008] In some embodiments, the insulating ring is a ceramic insulating ring.

[0009] In some embodiments, the burner is made of metal fiberboard or metal microporous plate.

[0010] In some embodiments, the burner and the metal needle body are made of the same nickel-chromium alloy.

[0011] In some embodiments, the ion probe includes an insulating sleeve and the metal needle body, wherein the insulating sleeve is fitted around the periphery of the metal needle body but does not cover the front section of the metal needle body.

[0012] In some embodiments, the partitioned combustion module further includes a cover that covers the front end of the support cylinder and the front end of the insulating ring located at the axial foremost point.

[0013] In some embodiments, the system further includes a housing, a mixing module, and a gas pipe; the housing contains an air flow channel, the front end of the housing is fixed to the rear end of the last insulating ring located axially, the mixing module is disposed within the housing, the rear end of the mixing module has an air inlet and a gas inlet, the front end of the mixing module has a mixed gas outlet, the air inlet communicates with the air flow channel within the housing, the gas inlet communicates with the outlet of the gas pipe, and the mixed gas outlet communicates with the axial rear end of the support cylinder.

[0014] In some embodiments, the mixing module includes a gas distributor and a plurality of mixing blades; the gas distributor includes a rear end plate, a front end plate, and a plurality of distributing blades, the middle portion of the rear end plate having the gas inlet, the plurality of distributing blades being circumferentially spaced between the rear end plate and the front end plate along the gas inlet, and a gas distribution flow channel being formed between circumferentially adjacent distributing blades; the plurality of mixing blades being circumferentially spaced on the outer periphery of the gas distributor, the rear opening between circumferentially adjacent mixing blades being the air inlet, and the front opening between circumferentially adjacent mixing blades being the mixed gas outlet.

[0015] In some embodiments, the front end of the housing is provided with an inner flange, and the rear sections of the plurality of ion probes pass through the inner flange and are fixed to the inner flange.

[0016] This invention also proposes a method for monitoring flame zones in a fully premixed surface burner.

[0017] According to a second aspect of the present invention, a flame zoning monitoring method for a fully premixed surface burner, using a flame zoning monitoring burner head according to a first aspect of the present invention, includes the following steps: The mixed gas enters the support cylinder from the axial rear end of the support cylinder, passes through the vent holes on the cylinder wall that are radially opposite to the multiple burners, enters the multiple annular spaces, and then flows out to the outside of the multiple burners for combustion; Multiple sets of ion probes and corresponding burners monitor the combustion status at multiple burners. If the ion probe does not generate a feedback signal, the combustion at the corresponding burner is normal, and the flame is close to the outer surface of the corresponding burner but does not contact it. If the ion probe generates a feedback signal, the combustion at the corresponding burner is abnormal, and the flame contacts the outer surface of the burner or burns inside the burner. In this case, the magnitude of the feedback signal value is used to determine whether it exceeds a threshold, and a backfire warning signal is issued. The threshold can be adjusted according to different operating conditions.

[0018] Since the flame zoning monitoring method for a fully premixed surface burner in the second aspect of the present invention utilizes the flame zoning monitoring burner head of the fully premixed surface burner in the first aspect of the present invention, the flame zoning monitoring method for a fully premixed surface burner in the second aspect of the present invention has essentially the same technical effects as the flame zoning monitoring burner head of the fully premixed surface burner in the first aspect of the present invention, and will not be described again here.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a perspective view of the flame zone monitoring burner structure of a fully premixed surface burner according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the flame zone monitoring burner head of the fully premixed surface burner according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the flame zone monitoring burner head of the fully premixed surface burner according to an embodiment of the present invention; Figure 4 yes Figure 3 Enlarged view of point A; Figure 5 This is a schematic cross-sectional view of the hybrid module according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the hybrid module structure according to an embodiment of the present invention.

[0021] Figure Labels Fully premixed surface burner flame zone monitoring burner head 1000; zone combustion module 1; support cylinder 101; burner 102; insulating ring 103; cover 104; zone monitoring module 2; ion probe 201; insulating sleeve 2011; metal needle body 2012; outer shell 3; air flow channel 301; mixing module 4; gas distributor 401; rear end plate 4011; front end plate 4012; distribution blade 4013; mixing blade 402; gas pipe 5. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] The following is combined Figures 1 to 6 This invention describes a flame zone monitoring burner head 1000 and method for a fully premixed surface burner according to an embodiment of the present invention.

[0024] like Figures 1 to 6 As shown, the flame zone monitoring burner head 1000 of the fully premixed surface burner according to the first aspect of the present invention includes a zone combustion module 1 and a zone monitoring module 2.

[0025] The zoned combustion module 1 includes a support cylinder 101, multiple burners 102, and multiple insulating rings 103. The multiple burners 102 are spaced apart from the axial rear end to the axial front end of the support cylinder 101, forming multiple annular spaces corresponding to each other. The multiple insulating rings 103 are fixed to the support cylinder 101 and distributed at the intervals between axially adjacent burners 102, at the rear end of the last axial burner 102, and at the front end of the first axial burner 102, supporting the ends of the corresponding burners 102 to insulate the multiple burners 102 from the support cylinder 101 and from axially adjacent burners 102. The insulating rings 103 provide mechanical support and electrical insulation, preventing mutual interference of flame signals between the multiple burner 102 areas. The axial rear end of the support cylinder 101 is used to introduce a mixture of air and fuel gas premixed together. The axial front end of the support cylinder 101 is closed. Ventilation holes (not shown in the figure) are distributed on the cylinder wall of the support cylinder 101 that is radially opposite to the burner 102. In this way, the mixture enters the support cylinder 101 from the axial rear end, and part of it flows to the axial front end in the support cylinder 101. It enters the corresponding annular space through the vent holes on the cylinder wall that is radially opposite to the burner 102, and diffuses to the outside of the burner 102 through the corresponding burner 102, where it is burned.

[0026] The zone monitoring module 2 includes multiple sets of ion probes 201. The multiple sets of ion probes 201 extend axially towards the front end between the support cylinder 101 and the burner 102 to the corresponding burners 102 and are fixed with the insulating rings 103 they pass through. The front section of the metal needle body 2012 of the multiple sets of ion probes 201 passes through the inner side of the corresponding burner 102 to the outer surface of the burner 102. The multiple sets of ion probes 201 and the outer surfaces of the multiple burners 102 form an integrated monitoring system. Since the burner 102 is electrically connected to the corresponding multiple sets of ion probes 201, both the burner 102 and the corresponding ion probes 201 participate in flame monitoring. When the flame comes into contact with the burner 102, the signal generated by the burner 102 is fed back through the corresponding ion probe 201, that is, the corresponding ion probe 201 generates a feedback signal. When the flame comes into contact with the ion probe 201, the signal generated by the ion probe 201 is fed back by the ion probe 201 itself. In other words, whether the burner 102 detects the flame or the ion probe 201 detects the flame, the ion probe 201 will generate a feedback signal. When the flame zoning monitoring burner head 1000 of the fully premixed surface burner is operating normally, the flame is on the outside of each burner 102, close to the outer surface of each burner 102, but not in contact with it. At this time, the ion probes 201 and the corresponding burners 102 will not detect the flame, and the ion probes 201 will not generate feedback signals. However, when the flame zoning monitoring burner head 1000 experiences abnormal operation due to external factors such as pressure fluctuations, regulation failure, or filter blockage, the flame may come into contact with or burn inside the outer surface of some burners 102. In this case, the corresponding ion probes 201 and / or burners 102 will detect the flame, and the corresponding ion probes 201 will generate intermittent weak or strong signals. This allows monitoring of the flame intensity on or inside the corresponding burner 102 to determine the possibility of backfire. Therefore, based on the different feedback signals from each set of ion probes 201, the combustion status at each burner 102 can be determined, and warning or emergency stop commands can be provided to the burner.

[0027] It should be noted that the number of ion probes 201 arranged corresponding to each burner 102 can be one or more, and can be selected as needed. For example, Figure 1 The diagram shows that each burner 102 corresponds to one ion probe in each group 201.

[0028] It should also be noted that other ion probes (not shown in the figure) can be arranged on the outer side of each burner 102 in a conventional manner. The other ion probes are a certain distance away from the outer surface of the burner 102 and are used to monitor the combustion status at a certain distance from the outer side of each burner 102.

[0029] The working principle of the flame zone monitoring burner head 1000 of the fully premixed surface burner according to the first aspect of the present invention is as follows: The premixed air and fuel gas mixture is introduced into the support cylinder 101 from the axial rear end of the support cylinder 101, and enters the annular space between each burner 102 and the support cylinder 101 through the vent holes on the cylinder wall of the support cylinder 101; since both ends of each annular space are sealed by the corresponding insulating rings 103, the mixture in each annular space diffuses to the outside of each burner 102 through the pores of each burner 102, and fully premixed surface combustion occurs; multiple sets of ion probes 201 monitor multiple Regarding the combustion status at each burner 102, if the ion probe 201 does not generate a feedback signal, the combustion at the corresponding burner 102 is normal, and the flame is close to the outer surface of the corresponding burner 102 but does not contact the outer surface of the corresponding burner 102; if the ion probe 201 generates a feedback signal, such as an intermittent weak signal or a strong signal, the combustion at the corresponding burner 102 is abnormal, and the flame contacts the outer surface of the burner 102 or burns inside the burner 102. At this time, the magnitude of the feedback signal value is used to determine whether it exceeds a threshold, and a backfire warning signal is issued. The threshold can be adjusted according to different operating conditions. Since each burner 102 is insulated and separated by a corresponding insulating ring 103, zoned combustion of the fully premixed surface burner is achieved. Since multiple sets of ion probes 201 extend axially to the front end between the support cylinder 101 and the burner 102 to the corresponding burners 102 and are fixed with the insulating rings 103 they pass through, the front section of the metal needle body 2012 of the multiple sets of ion probes 201 passes through the inner side of the corresponding burner 102 to the outer surface of the burner 102, realizing zoned flame monitoring of the fully premixed surface burner, and each set of ion probes 201 and the corresponding burner achieve integrated monitoring. The combustion status at the corresponding burner 102 is judged based on the feedback signal intensity of each set of ion probes 201, which can not only effectively prevent backfire, but also effectively detect the flame distribution in the combustion area of ​​each burner 102, adjust the uniform distribution of the flame in multiple areas, and make the combustion equipment operate safely and stably.

[0030] The flame zoning monitoring burner head 1000 of the fully premixed surface burner according to the first aspect of the present invention has the following advantages: On the one hand, it realizes zoning combustion and flame zoning monitoring of the fully premixed surface burner. Each set of ion probes 201 and the corresponding burner 102 can monitor in real time whether there is a combustion flame on the outer surface or inside of each burner 102. In particular, it can capture the flame state on the outer surface of the burner 102 in real time and issue an early warning before backfire occurs. The insulating ring 103 isolates adjacent burners 102 and burners 102 from the support cylinder 101, avoiding mutual interference of ion currents in different zoning flames, ensuring the accuracy of the ion probe 201 signal and accurate monitoring. The zoning monitoring of multiple burners 102 corresponding to multiple sets of ion probes 201 can accurately locate abnormal combustion zones. Therefore, the flame zoning monitoring burner head 1000 of the fully premixed surface burner according to the first aspect of the present invention can effectively prevent backfire and improve the safety of the burner. On the other hand, through zoning monitoring, the flame distribution of the combustion area of ​​each burner 102 can be effectively detected, and the flame distribution in multiple areas can be adjusted to be uniform, so that the combustion equipment can operate safely and stably.

[0031] In some embodiments, the insulating ring 103 is a ceramic insulating ring, specifically a high-strength sintered ceramic insulating ring. Ceramic materials have high melting points and high resistivity, and can withstand the high temperatures of fully premixed surface combustion and interference from the gas electric field, ensuring stability and reliability.

[0032] In some embodiments, the burner 102 is made of a metal fiber plate or a metal microporous plate. The metal fiber plate or metal microporous plate can prevent localized overcombustion and achieve high combustion efficiency.

[0033] In some embodiments, the burner 102 and the metal needle 2012 are made of the same nickel-chromium alloy. Nickel-chromium alloys have high high-temperature strength, good oxidation resistance, low coefficient of thermal expansion, and are stable, reliable, and corrosion-resistant.

[0034] In some embodiments, the ion probe 201 includes an insulating sleeve 2011 and a metal needle body 2012. The insulating sleeve 2011 is fitted around the outer periphery of the metal needle body 2012 but does not cover the front section of the metal needle body 2012. The front section of the metal needle body 2012 is exposed and directly contacts the flame on the outer surface of the burner 102 or inside it, which can efficiently capture charged particles in the flame and determine the flame state (flame / flashback / extinguishment) by the change in ion current, with high sensitivity. The insulating sleeve 2011 provides electrical insulation, improving the safety of burner operation.

[0035] In some embodiments, the partitioned combustion module 1 further includes a cover 104, which covers the front end of the support cylinder 101 and the front end of the insulating ring 103 located at the axial foremost point. This enhances the sealing performance.

[0036] In some embodiments, the system further includes a housing 3, a mixing module 4, and a gas pipe 5. The housing 3 contains an airflow channel 301. The front end of the housing 3 is fixed to the rear end of the last axial insulating ring 103, meaning the housing 3 is insulated from the last axial burner 102 via the last axial insulating ring 103. The mixing module 4 is disposed within the housing 3. The rear end of the mixing module 4 has an air inlet and a gas inlet, while the front end has a mixed gas outlet. The air inlet communicates with the airflow channel 301 within the housing 3, the gas inlet communicates with the outlet of the gas pipe 5, and the mixed gas outlet communicates with the axial rear end of the support cylinder 101. Thus, air enters the airflow channel 301 within the housing 3 and then enters the mixing module 4. Simultaneously, gas enters the gas pipe 5 and then enters the mixing module 4. The air and gas are premixed in the mixing module 4 to form a mixed gas, which then enters the support cylinder 101. This ensures efficient premixing and gas delivery.

[0037] In some embodiments, such as Figures 3 to 6 As shown, the mixing module 4 includes a gas distributor 401 and multiple mixing blades 402; the gas distributor 401 includes a rear end plate 4011, a front end plate 4012 and multiple distributing blades 4013, the middle part of the rear end plate 4011 has a gas inlet, the multiple distributing blades 4013 are circumferentially spaced between the rear end plate 4011 and the front end plate 4012, and a gas distribution flow channel is formed between two adjacent distributing blades 4013 in the circumferential direction; the multiple mixing blades 402 are circumferentially spaced on the outer periphery of the gas distributor 401, the rear opening between two adjacent distributing blades 402 in the circumferential direction is an air inlet, and the front opening between two adjacent distributing blades 402 in the circumferential direction is a mixed gas outlet.

[0038] During operation, the gas enters the distributor 401 through the gas pipe 5, is split by the distribution blades 4013, and flows through the gas distribution channel into the mixing space between the mixing blades 402. Air enters the mixing space between the mixing blades 402 through the air inlet of the air channel 301 of the outer shell 3. After the gas and air are fully mixed in each mixing space, they flow into the support cylinder 101 from the mixed gas outlet. This mixing module 4 achieves thorough mixing and high mixing efficiency.

[0039] In some embodiments, the front end of the housing 3 is provided with an inward flange, and the rear sections of multiple sets of ion probes 201 pass through the inward flange and are fixed to the inward flange. This makes the installation more stable and avoids displacement of the ion probes 201 caused by combustion vibration.

[0040] This invention also proposes a method for monitoring flame zones in a fully premixed surface burner.

[0041] According to a second aspect of the present invention, a flame zoning monitoring method for a fully premixed surface burner, using a flame zoning monitoring burner head 1000 of a first aspect of the present invention, includes the following steps: The mixed gas enters the support cylinder 101 from the axial rear end of the support cylinder 101, passes through the vent holes on the cylinder wall that are radially opposite to the multiple burners 102, enters multiple annular spaces, and then flows out to the outside of the multiple burners 102 for combustion. Multiple sets of ion probes 201 and corresponding burners monitor the combustion status at multiple burners 102. If the ion probe 201 does not generate a feedback signal, the combustion at the corresponding burner 102 is normal, and the flame is close to the outer surface of the corresponding burner 102 but does not contact the outer surface of the corresponding burner 102. If the ion probe 201 generates a feedback signal, the combustion at the corresponding burner 102 is abnormal, and the flame contacts the outer surface of the burner 102 or burns inside the burner 102. At this time, the backfire warning signal is issued based on the magnitude of the feedback signal value. If the threshold is exceeded, the backfire warning signal is issued. The threshold can be adjusted according to different operating conditions.

[0042] Since the flame zoning monitoring method for a fully premixed surface burner according to the second aspect of the present invention utilizes the flame zoning monitoring burner head 1000 of the fully premixed surface burner according to the first aspect of the present invention, the flame zoning monitoring method for a fully premixed surface burner according to the second aspect of the present invention has essentially the same technical effects as the flame zoning monitoring burner head 1000 of the fully premixed surface burner according to the first aspect of the present invention, and will not be described again here.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flame zone monitoring burner head for a fully premixed surface burner, characterized in that, include: A zoned combustion module includes a support cylinder, multiple burners, and multiple insulating rings. The multiple burners are spaced apart from the axial rear end to the axial front end of the support cylinder, forming multiple annular spaces corresponding to the support cylinder. The multiple insulating rings are fixed to the support cylinder and distributed at the intervals between axially adjacent burners, at the rear end of the last axial burner, and at the front end of the first axial burner, supporting the ends of the corresponding burners to insulate the multiple burners from the support cylinder and from axially adjacent burners. The axial rear end of the support cylinder is used to introduce a premixed gas mixture of air and fuel gas, and the axial front end of the support cylinder is closed. Ventilation holes are distributed on the cylinder wall radially opposite to the burners. The partition monitoring module includes multiple sets of ion probes. The multiple sets of ion probes extend axially towards the front end between the support cylinder and the burner to the corresponding burners and are fixed to the insulating rings they pass through. The front section of the metal needle of the multiple sets of ion probes passes through the burner from the inside to the outer surface of the burner. The multiple sets of ion probes and the outer surfaces of the multiple burners form an integrated monitoring system.

2. The flame zone monitoring burner head of the fully premixed surface burner according to claim 1, characterized in that, The insulating ring is a ceramic insulating ring.

3. The flame zone monitoring burner head of the fully premixed surface burner according to claim 1, characterized in that, The burner is made of metal fiberboard or metal microporous plate.

4. The flame zone monitoring burner head for a fully premixed surface burner according to claim 1, characterized in that, The burner and the metal needle body are made of the same nickel-chromium alloy.

5. The flame zone monitoring burner head for a fully premixed surface burner according to claim 1, characterized in that, The ion probe includes an insulating sleeve and a metal needle body. The insulating sleeve is fitted around the outer periphery of the metal needle body but does not cover the front section of the metal needle body.

6. The flame zone monitoring burner head of the fully premixed surface burner according to any one of claims 1 to 5, characterized in that, The partitioned combustion module also includes a cover, which covers the front end of the support cylinder and the front end of the insulating ring located at the axial foremost point.

7. The flame zone monitoring burner head for a fully premixed surface burner according to any one of claims 1 to 5, characterized in that, It also includes a housing, a mixing module, and a gas pipe; the housing contains an air flow channel, the front end of the housing is fixed to the rear end of the last insulating ring located in the axial direction, the mixing module is disposed in the housing, the rear end of the mixing module is provided with an air inlet and a gas inlet, the front end of the mixing module is provided with a mixed gas outlet, the air inlet is connected to the air flow channel in the housing, the gas inlet is connected to the outlet of the gas pipe, and the mixed gas outlet is connected to the axial rear end of the support cylinder.

8. The flame zone monitoring burner head for a fully premixed surface burner according to claim 7, characterized in that, The mixing module includes a gas distributor and multiple mixing blades; the gas distributor includes a rear end plate, a front end plate and multiple distributing blades, the middle part of the rear end plate has the gas inlet, and the multiple distributing blades are arranged circumferentially between the rear end plate and the front end plate along the gas inlet, and a gas distribution channel is formed between two adjacent distributing blades in the circumferential direction. Multiple mixing blades are circumferentially spaced on the outer periphery of the gas distributor. The rear opening between two adjacent mixing blades in the circumferential direction is the air inlet, and the front opening between two adjacent mixing blades in the circumferential direction is the mixed gas outlet.

9. The flame zone monitoring burner head for a fully premixed surface burner according to claim 7, characterized in that, The front end of the outer shell is provided with an inner flange, and the rear sections of the multiple sets of ion probes pass through the inner flange and are fixed to the inner flange.

10. A method for monitoring flame zones in a fully premixed surface burner, characterized in that, Monitoring is performed using the flame zone monitoring burner head of the fully premixed surface burner as described in any one of claims 1 to 9, comprising the following steps: The mixed gas enters the support cylinder from the axial rear end of the support cylinder, passes through the vent holes on the cylinder wall that are radially opposite to the multiple burners, enters the multiple annular spaces, and then flows out to the outside of the multiple burners for combustion; Multiple sets of ion probes and corresponding burners monitor the combustion status at multiple burners. If the ion probe does not generate a feedback signal, the combustion at the corresponding burner is normal, and the flame is close to the outer surface of the corresponding burner but does not contact the outer surface of the corresponding burner. If the ion probe generates a feedback signal, the combustion at the corresponding burner is abnormal, and the flame is in contact with the outer surface of the burner or burning inside the burner. At this time, the magnitude of the feedback signal value is used to determine whether it exceeds the threshold, and a backfire warning signal is issued. The threshold can be adjusted according to different operating conditions.

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