CN113237095B - Ignition device, flame detection method and combustion system - Google Patents
Ignition device, flame detection method and combustion system Download PDFInfo
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- CN113237095B CN113237095B CN202110594304.5A CN202110594304A CN113237095B CN 113237095 B CN113237095 B CN 113237095B CN 202110594304 A CN202110594304 A CN 202110594304A CN 113237095 B CN113237095 B CN 113237095B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q13/00—Igniters not otherwise provided for
- F23Q13/02—Igniters not otherwise provided for using gas burners, e.g. gas pokers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M11/00—Safety arrangements
- F23M11/04—Means for supervising combustion, e.g. windows
- F23M11/045—Means for supervising combustion, e.g. windows by observing the flame
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Abstract
The invention provides an ignition device, a flame detection method and a combustion system, wherein the ignition device is applied to the combustion system, a containing cavity is arranged in the ignition device, the ignition device comprises a fuel pipe, an ignition rod and a flame detection device, at least part of structures of the fuel pipe, the ignition rod and the flame detection device are arranged in the containing cavity, and the flame detection device comprises an ion detection module and/or an electrical temperature measurement module; the ignition device detects the ignition flame through the ion detection module and/or the electrical temperature measurement module so as to detect the operation condition of the ignition device in real time, and is favorable for improving the accuracy of flame detection.
Description
Technical Field
The invention relates to the technical field of flame detection, in particular to a flame detection device, an ignition device, a flame detection method and a combustion system.
Background
In combustion systems in industry, such as torch systems, burners and the like, ignition devices, such as incandescent lamps, igniters and the like, are often required to be arranged inside the systems.
According to the practical application and operation of the combustion system, the ignition performance of the ignition device must have the following requirements: 1. the ignition success rate is high; 2. the flame combustion is stable; 3. have high temperature resistance and long service life. Among them, the flame holding condition of the ignition device is particularly important for the combustion system; however, the flame holding is a dynamic process, and is very easily influenced by factors such as fuel, combustion-supporting gas and the outside, so that the flame of the ignition device is easily extinguished, and if the flame state of the ignition device is not monitored in time, the normal operation of the combustion system is easily influenced. Meanwhile, the ignition device in the prior art often needs to be provided with related pipelines of fuel and combustion-supporting gas and even a premixing structure, so that the structure of the ignition device is complex, and the production and manufacturing difficulty of the ignition device is increased.
In the prior art, for example, patent CN108267499A discloses a torch incandescent lamp combustion state detection device and detection method based on an ion loop, which uses a flame ion detector to detect the flame state of an incandescent lamp burner; however, the detection device and the detection method are simple, and erroneous judgment due to damage of components such as the flame ion detector, flame fluctuation, interference of detection signals, fluctuation of detection signals and the like is easy to occur, so that it is difficult to ensure the accuracy of flame detection.
Disclosure of Invention
In view of this, the present invention is directed to an ignition device, a flame detection method, and a combustion system, so as to solve the problem in the prior art that the accuracy of detecting the flame of the ignition device is poor.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an ignition device is applied to a combustion system, a containing cavity is arranged inside the ignition device, the ignition device comprises a fuel pipe, an ignition rod and a flame detection device, at least part of structures of the fuel pipe, the ignition rod and the flame detection device are arranged in the containing cavity, and the flame detection device comprises an ion detection module and/or an electrical temperature measurement module.
Furthermore, one end of the ignition device is provided with a fire outlet which is communicated with the accommodating cavity; the ignition device comprises a fuel manifold for supplying fuel gas; the feeding end of the fuel pipe is communicated with the fuel main pipe, the discharging end of the fuel pipe is arranged in the accommodating cavity, the distance between the discharging end of the fuel pipe and the fire outlet is recorded as K, the total length of the outer pipe of the ignition device is recorded as L, the inner diameter of the outer pipe is recorded as D, K/L =0.03-0.1, and K/D = 0.95-1.05.
Further, the detection end of the flame detection device is arranged in the accommodating cavity, the distance between the detection end of the flame detection device and the fire outlet is recorded as M, and M/K = 1.5-2.0.
Further, the fuel pipes comprise a main fuel pipe and a secondary fuel pipe, and the feeding ends of the main fuel pipe and the secondary fuel pipe are communicated with the fuel main pipe; the discharge end of the main fuel pipe and the discharge end of the secondary fuel pipe are both arranged in the accommodating cavity; recording the distance from the discharge end of the main fuel pipe to the fire outlet as K ', and recording the distance from the discharge end of the auxiliary fuel pipe to the fire outlet as N, wherein N is more than K' = K; the distance between the ignition end of the ignition rod and the fire outlet is smaller than N and larger than K'.
Further, N/K' = 2.2-2.8.
Further, the flame detection device comprises an ion detection module and an electrical temperature measurement module, and is used for simultaneously carrying out ion detection and temperature detection on the pilot flame of the ignition device; the ion detection module is a flame ion detector, and the electrical temperature measurement module is a thermocouple thermometer or a thermal resistance thermometer.
Furthermore, the main fuel pipe is overlapped with the central axis of the outer pipe of the ignition device, the electric temperature measuring module is arranged on one side of the projection connecting line between the main fuel pipe and the auxiliary fuel pipe, and the ion detection module is arranged on the other side of the projection connecting line between the main fuel pipe and the auxiliary fuel pipe; recording the included angle between the projection connecting line between the electrical temperature measuring module and the main fuel pipe and between the electrical temperature measuring module and the auxiliary fuel pipe as A, wherein A is 40-60 degrees; and recording the included angle between the projection connecting line between the ion detection module and the main fuel pipe and the projection connecting line between the main fuel pipe and the auxiliary fuel pipe as B, wherein B is 40-60 degrees.
The ignition device further comprises a signal processing module, wherein the signal processing module is respectively connected with the ion detection module and the electric temperature measurement module and is used for processing data related to flame detection; the flame detection method comprises the following steps:
s1, igniting fuel by an ignition device through a fuel pipe and an ignition rod to start combustion;
s2, the signal processing module controls the ion detection module and the electric temperature measurement module to monitor the ignition flame in real time;
s3, the signal processing module judges whether the ignition device meets a first judgment condition; if yes, the ignition device is judged to have pilot flame, and the step returns to the step S2; if not, go to step S4;
and S4, the signal processing module judges whether a second judgment condition is met, if so, the pilot flame of the ignition device is judged to be extinguished, if not, the ignition device is judged to have the pilot flame, and the step S2 is returned.
Further, the first determination condition is that the ion detection module detects that the plasma signal intensity of the ignition device is greater than or equal to a preset intensity threshold, or the electrical temperature measurement module detects that the absolute value of the temperature rise amplitude of the ignition device within a first rated duration is greater than a first rated temperature; the second determination condition is that the ion detection module detects that the plasma signal intensity of the ignition device is smaller than a preset intensity threshold value, and the electrical temperature measurement module detects that the absolute value of the cooling amplitude of the ignition device in the second rated time is larger than the second rated temperature.
A combustion system comprises the ignition device.
Compared with the prior art, the ignition device, the flame detection method and the combustion system have the following advantages:
according to the ignition device, the flame detection method and the combustion system, the ignition flame is detected through the ion detection module and/or the electric temperature measurement module so as to detect the operation condition of the ignition device in real time, and the accuracy of flame detection is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an ignition device according to an embodiment of the present invention;
FIG. 2 is a schematic view of a flame outlet of an ignition device according to an embodiment of the present invention;
FIG. 3 is another schematic structural diagram of an ignition device according to an embodiment of the present invention;
fig. 4 is another schematic view of a fire outlet of an ignition device according to an embodiment of the present invention.
Description of the reference numerals:
1. an ignition device; 11. an accommodating chamber; 12. a fire outlet; 13. an assembly end; 14. a fixed seat; 15. an outer tube; 2. a flame detection device; 21. an ion detection module; 22. an electrical temperature measuring module; 3. a fuel tube; 31. a primary fuel pipe; 32. a secondary fuel pipe; 4. an ignition bar; 5. a fuel manifold.
Detailed Description
The inventive concepts of the present disclosure will be described hereinafter using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. These inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
In order to solve the problem of poor accuracy of detecting the flame of the ignition device in the prior art, the present embodiment provides an ignition device, a flame detection method, and a combustion system, as shown in fig. 1 to 4, the ignition device 1 is applied to a combustion system, and the combustion system may be a conventional torch system or a conventional burner; the ignition device 1 is a pilot lamp, an igniter and the like in a combustion system, and can provide pilot flame for the combustion system so as to maintain continuous combustion of main flame in the combustion system.
For convenience of description, the main flame of the combustion system is collectively referred to as "main flame", and the flame of the ignition device 1 is collectively referred to as "pilot flame".
The ignition device 1 has a hollow straight tube structure, and a main body thereof is referred to as an outer tube 15, and for convenience of illustration, a tube section of a partial length thereof is omitted in the drawings; the ignition device 1 is internally provided with an accommodating cavity 11 for accommodating ignition related components and flame detection related components, specifically, the ignition device 1 comprises a fuel pipe 3, an ignition rod 4 and a flame detection device 2, the fuel pipe 3 is used for providing fuel for pilot flame of the ignition device 1, the fuel can be natural gas, coal gas, industrial combustible waste gas and the like, the ignition rod 4 is used for igniting the fuel conveyed by the fuel pipe 3, and the flame detection device 2 is used for detecting the pilot flame so as to detect the operating condition of the ignition device 1 in real time; at least a part of the structures of the fuel pipe 3, the ignition rod 4, and the flame detection device 2 are disposed in the accommodating chamber 11. Wherein, the flame detection device 2 comprises a flame ion detection device and/or an electric flame detection device; for example, the flame detection device 2 in the ignition device 1 may be one flame ion detection device, one electric flame detection device, two or more flame ion detection devices, two or more electric flame detection devices, or both the flame ion detection device and the electric flame detection device provided in the ignition device 1. The flame ion detection device can be an ion detection module (21), such as a flame ion detector; the electrical flame detection device may be an electrical temperature measurement module 22, such as a thermocouple thermometer or a thermal resistance thermometer.
One end of the ignition device 1 is provided with a fire outlet 12, the fire outlet 12 is communicated with the accommodating cavity 11 and extends to a combustion area in the combustion system, and the fire outlet is recorded as a fire outlet end of the ignition device 1 and used for igniting and maintaining continuous combustion of main flame. The other end of ignition device 1 is assembly end 13, assembly end 13 sets up fixing base 14, fixing base 14 is connected with fuel pipe 3, ignition rod 4, flame detection device 2 respectively for fix spacing to fuel pipe 3, ignition rod 4, flame detection device 2.
For the prior art, fuel is often supplied to the ignition device by premixing the fuel gas with air, then introducing the premixed fuel gas into a fuel pipe, and igniting the premixed fuel gas; in the present application, only fuel gas is introduced into the fuel pipe 3, and the related process and structural components of fuel premixing in the prior art are omitted, and the ignition device 1 comprises a fuel manifold 5 for supplying fuel gas; the feed end of the fuel pipe 3 penetrates through the fixed seat 14 and is communicated with the fuel main pipe 5; in order to ensure the normal combustion of the fuel gas, the discharge end of the fuel pipe 3 is disposed in the accommodating cavity 11, and the distance from the discharge end of the fuel pipe 3 to the fire outlet 12 is denoted as K, the total length of the outer pipe 15 of the ignition device 1 is denoted as L, the inner diameter of the outer pipe 15 is denoted as D, K/L =0.03-0.1, and K/D =0.95-1.05, so that the fuel gas jetted from the fuel pipe 3 can be directly mixed with the air in the accommodating cavity 11 by limiting the disposed position of the discharge end of the fuel pipe 3, and simultaneously the air outside the fire outlet 12 can be ensured to flow to the vicinity of the discharge end of the fuel pipe 3 in time to supplement the air in the accommodating cavity 11, so that the fuel gas jetted from the fuel pipe 3 can be stably combusted, which is the present application, on one hand, the related processes and structural components of fuel premixing in the prior art are omitted, the ignition device 1 is convenient to produce and manufacture, the cost is saved, and on the other hand, the stable combustion of fuel gas is fully ensured on the basis of no fuel premixing, and the continuous stability of pilot flame is ensured.
For the detection end of the flame detection device 2, no matter the flame ion detection device or the electric flame detection device is arranged in the accommodating cavity 11, and the distance between the detection end of the flame detection device 2 and the fire outlet 12 is marked as M, M/K =1.5-2.0, the detection end is arranged in the accommodating cavity 11 by limiting the arrangement position of the detection end of the flame detection device 2, and the pilot flame can be ensured between the main flame and the detection end, so that on one hand, under the combined action of the pilot flame and the outer tube 15, the interference of the main flame to the flame detection device 2 can be reduced to the maximum extent, the flame detection device 2 can accurately detect the flame, the accuracy of flame detection is improved, on the other hand, the detection end of the pilot flame detection device 2 is arranged in the combustion low-temperature region of the pilot flame, and the condition that the flame detection device 2 is damaged at high temperature in use can be effectively prevented, the service life of the flame detection device 2 is increased.
As for the flame detection device 2, as a preferable scheme in the present application, the flame detection device 2 includes an ion detection module 21 and an electrical temperature measurement module 22, and is used for performing ion detection and temperature detection on the pilot flame of the ignition device 1 at the same time.
The ion detection module 21 is a flame ion detector and is provided with an ion bar probe, the electrical temperature measurement module 22 is a thermocouple thermometer or a thermal resistance thermometer, when the electrical temperature measurement module 22 is the thermocouple thermometer, the ion detection module is provided with a thermocouple probe, and when the electrical temperature measurement module 22 is the thermal resistance thermometer, the electrical temperature measurement module is provided with a thermal resistance probe; for convenience of description, the thermocouple probe and the thermal resistance probe are collectively referred to as a temperature probe.
When the ion detection module 21 detects plasma generated by the pilot flame through the ion rod probe, it indicates that the pilot flame of the ignition device 1 is in a maintenance state, i.e. the ignition device 1 is considered to be "on fire"; when it does not detect the plasma signal, it indicates that the pilot flame of the ignition device 1 may be in an extinguished state, i.e. it is considered that the ignition device 1 may be "free of fire".
When the temperature measuring probe detects that the temperature of the pilot flame rises within the rated time or the temperature of the pilot flame is continuously higher than the preset high temperature, indicating that the ignition device 1 is on fire; when it is detected that the pilot flame temperature has decreased within the rated time by the rated temperature, or the pilot flame temperature continues to be less than the preset low temperature, it is indicated that the ignition device 1 may be "fireless". Here, "with fire" means that the pilot flame of the ignition device 1 is in a burning state, and "without fire" means that the pilot flame of the ignition device 1 is in an extinguished state, in the same manner as in the conventional literal understanding.
On this basis, the ignition device 1 further comprises a signal processing module, and the signal processing module is respectively connected with the ion detection module 21 and the electrical temperature measurement module 22 and is used for processing data related to flame detection. The signal processing module can be a single chip microcomputer, a signal processing module, a signal processor and other conventional data processing components.
On the basis of the combustion system and the ignition device 1, the present embodiment further provides a flame detection method, including:
s1, the ignition device 1 ignites fuel through the fuel pipe 3 and the ignition rod 4 to start combustion;
s2, the signal processing module controls the ion detection module 21 and the electric temperature measurement module 22 to monitor the ignition flame in real time;
s3, the signal processing module judges whether the ignition device 1 meets a first judgment condition; if yes, the ignition device 1 is judged to have pilot flame, and the process returns to step S2; if not, go to step S4;
specifically, the first determination condition is that the ion detection module 21 detects that the plasma signal of the ignition device 1 (or the ion detection module 21 detects that the plasma signal intensity of the ignition device 1 is greater than or equal to the preset intensity threshold), or the electrical temperature measurement module 22 detects that the absolute value of the temperature rise range of the ignition device 1 within the first rated duration is greater than the first rated temperature; preferably, the first rated time is 5-20s, and the first rated temperature is 15-50 ℃.
And S4, the signal processing module judges whether a second judgment condition is met, if so, the pilot flame of the ignition device 1 is judged to be extinguished, if not, the ignition device 1 is judged to have the pilot flame, and the step S2 is returned.
Specifically, the second determination condition is that the ion detection module 21 does not detect the plasma signal of the ignition device 1 (or the ion detection module 21 detects that the intensity of the plasma signal of the ignition device 1 is smaller than the preset intensity threshold), and the electrical temperature measurement module 22 detects that the absolute value of the temperature reduction amplitude of the ignition device 1 in the second rated duration is greater than the second rated temperature; preferably, the second rated time is 5-20s, and the second rated temperature is 10-30 ℃.
Therefore, the flame detection method carries out two-stage detection judgment on the flame state through the ion detection module 21 and the electrical temperature measurement module 22, when at least one of the ion detection module 21 and the electrical temperature measurement module 22 meets the judgment of 'fire', the ignition device 1 is confirmed to have the pilot flame, and when the ion detection module 21 and the electrical temperature measurement module 22 all meet the judgment of 'no fire', the pilot flame of the ignition device 1 is confirmed to be extinguished, so that the misjudgment possibly caused by single-stage detection or single detection is avoided to a certain extent, and the accuracy of flame detection is improved.
Example 2
Considering the different requirements of different fuels for combustion environments, the ignition device 1 may be configured to maintain the fuel gas that is easy to sustain combustion in the same manner as in embodiment 1. In the present embodiment, the ignition device 1 is further modified from the embodiment 1 with respect to the fuel gas which is relatively difficult to sustain combustion, specifically:
as shown in fig. 3, the fuel pipes 3 include a primary fuel pipe 31 and a secondary fuel pipe 32, and a feed end of the primary fuel pipe 31 and a feed end of the secondary fuel pipe 32 both penetrate through the fixing base 14 and are both communicated with the fuel header pipe 5; the discharge ends of the main fuel pipe 31 and the secondary fuel pipe 32 are both arranged in the accommodating chamber 11; the distance from the discharge end of the main fuel pipe 31 to the fire outlet 12 is denoted as K ', the distance from the discharge end of the secondary fuel pipe 32 to the fire outlet 12 is denoted as N, N > K ', and the distance from the ignition end of the ignition rod 4 to the fire outlet 12 is smaller than N and larger than K '. Therefore, by optimizing the structure of the fuel pipe 3 and the ignition rod 4, the fuel is ejected in two stages, the ignition fuel is ejected from the secondary fuel pipe 32, the main fuel is ejected from the main fuel pipe 31, during the ignition process of the ignition device 1, the ignition fuel in the secondary fuel pipe 32 is ignited by the ignition rod 4, then the flame in the secondary fuel pipe 32 ignites the main fuel in the main fuel pipe 31, then the flame in the main fuel pipe 31 and the flame in the secondary fuel pipe 32 form a pilot flame, and a mutual ignition relationship is generated between the two flames, so that the effect of stable combustion is achieved, and the continuous stability of the pilot flame is ensured.
Meanwhile, the outer tube 15 is provided with a plurality of vent holes near the discharge end of the secondary fuel tube 32, so that ignition fuel sprayed from the secondary fuel tube 32 can be directly mixed with air in the accommodating chamber 11, and air outside the outer tube 15 can be ensured to flow near the discharge end of the secondary fuel tube 32 through the vent holes in time, so as to supplement the air in the accommodating chamber 11, and ensure stable and continuous flame of the secondary fuel tube 32.
Preferably, the main fuel pipe 31 in embodiment 2 may be regarded as an alternative to the fuel pipe 3 in embodiment 1, and the position setting of the main fuel pipe 31 may completely adopt the position setting of the fuel pipe 3 in embodiment 1, that is, K' = K; meanwhile, the main fuel pipe 31 coincides with the central axis of the outer pipe 15; on this basis, embodiment 2 is substantially equivalent to additionally adding the secondary fuel pipe 32, and N/K' = 2.2-2.8. Through further limiting the discharge ends of the main fuel pipe 31 and the auxiliary fuel pipe 32, the flame of the main fuel pipe 31 and the flame of the auxiliary fuel pipe 32 are ensured to be in an interval capable of igniting each other, and the continuous and stable combustion of the ignition flame is ensured.
Meanwhile, the flame detection device 2 may be provided as described in embodiment 1; further, in the case where the ion detection module 21 and the electrical temperature measurement module 22 are provided at the same time, as shown in fig. 4, the electrical temperature measurement module 22 is provided on one side of the projected line between the main fuel pipe 31 and the sub fuel pipe 32, and the ion detection module 21 is provided on the other side of the projected line between the main fuel pipe 31 and the sub fuel pipe 32. Preferably, an included angle between a projection connecting line between the electrical temperature measuring module 22 and the main fuel pipe 31 and a projection connecting line between the main fuel pipe 31 and the auxiliary fuel pipe 32 is recorded as a, and a is 40-60 degrees; an included angle between a projection connection line between the ion detection module 21 and the main fuel pipe 31 and a projection connection line between the main fuel pipe 31 and the sub fuel pipe 32 is denoted as B, and B is 40 ° to 60 °. Meanwhile, the flame detection method in embodiment 2 may be identical to the flame detection method in embodiment 1. In combination with the arrangement of the discharge end of the main fuel pipe 31, the discharge end of the secondary fuel pipe 32 and the detection end of the flame detection device 2, the embodiment 2 further limits the arrangement positions of the ion detection module 21 and the electrical temperature measurement module 22, and on the basis of mutual ignition of the main fuel pipe 31 and the secondary fuel pipe 32, on one hand, the ion rod probe and the temperature measurement probe can be ensured to be still in a combustion low-temperature region where flame is ignited, the condition that the relevant probes are damaged at high temperature in use can be effectively prevented, and the service life of the flame detection device 2 is prolonged; on the other hand, the flame detection device 2 can simultaneously detect the flame of the main fuel pipe 31 and the flame of the auxiliary fuel pipe 32, can detect the extinguishment of any flame, improves the sensitivity of flame detection, can alarm after detecting that any flame is extinguished, and provides early warning for the simultaneous extinguishment of two possible flames.
Of course, embodiment 2 is not limited to fuel gas that is relatively difficult to maintain combustion, and the related structure of embodiment 1 may be replaced or combined, and will not be described herein.
In the present invention, a combustion system is also provided, which includes the ignition device 1, and on the basis of any embodiment of the present application, the combustion system further adopts the flame detection method. Likewise, the combustion system may also include other components of a conventional flare system or a conventional combustor, which are not described in detail herein in view of the prior art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A flame detection method of an ignition device, wherein the ignition device (1) is applied to a combustion system, and is characterized in that a containing cavity (11) is arranged inside the ignition device (1), the ignition device (1) comprises a fuel pipe (3), an ignition rod (4) and a flame detection device (2), at least part of structures of the fuel pipe (3), the ignition rod (4) and the flame detection device (2) are arranged in the containing cavity (11), and the flame detection device (2) comprises an ion detection module (21) and an electrical temperature measurement module (22); the ignition device (1) comprises a signal processing module, and the signal processing module is respectively connected with an ion detection module (21) and an electric temperature measurement module (22) and is used for processing flame detection related data; the flame detection method comprises the following steps:
s1, the ignition device (1) ignites fuel through the fuel pipe (3) and the ignition rod (4) to start combustion;
s2, the signal processing module controls the ion detection module (21) and the electric temperature measurement module (22) to monitor the pilot flame in real time;
s3, the signal processing module judges whether the ignition device (1) meets a first judgment condition; if yes, judging that the ignition device (1) has pilot flame, and returning to the step S2; if not, go to step S4;
s4, the signal processing module judges whether a second judgment condition is met, if yes, the pilot flame of the ignition device (1) is judged to be extinguished, if not, the ignition device (1) is judged to have the pilot flame, and the step S2 is returned;
the first judgment condition is that the ion detection module (21) detects that the plasma signal intensity of the ignition device (1) is greater than or equal to a preset intensity threshold value, or the electrical temperature measurement module (22) detects that the absolute value of the temperature rise amplitude of the ignition device (1) in a first rated time is greater than a first rated temperature; the second determination condition is that the ion detection module (21) detects that the plasma signal intensity of the ignition device (1) is smaller than a preset intensity threshold value, and the electrical temperature measurement module (22) detects that the absolute value of the temperature reduction amplitude of the ignition device (1) in a second rated time length is larger than a second rated temperature; the first rated time is 5-20s, the first rated temperature is 15-50 ℃, the second rated time is 5-20s, and the second rated temperature is 10-30 ℃.
2. The flame detection method of the ignition device according to claim 1, characterized in that a fire outlet (12) is arranged at one end of the ignition device (1), and the fire outlet (12) is communicated with the accommodating cavity (11); the ignition device (1) comprises a fuel main (5) for supplying fuel gas; the feed end of the fuel pipe (3) is communicated with a fuel main pipe (5), the discharge end of the fuel pipe (3) is arranged in the accommodating cavity (11), the distance between the discharge end of the fuel pipe (3) and the fire outlet (12) is recorded as K, the total length of an outer pipe (15) of the ignition device (1) is recorded as L, the inner diameter of the outer pipe (15) is recorded as D, K/L =0.03-0.1, and K/D = 0.95-1.05.
3. A flame detection method of an ignition device according to claim 2, characterized in that the detection end of the flame detection device (2) is arranged in the accommodating cavity (11), and the distance from the detection end of the flame detection device (2) to the fire outlet (12) is recorded as M, and M/K = 1.5-2.0.
4. A flame detection method of an ignition device according to claim 2, wherein the fuel pipes (3) include a main fuel pipe (31) and a sub fuel pipe (32), and the feeding ends of the main fuel pipe (31) and the sub fuel pipe (32) are both communicated with the fuel header pipe (5); the discharge ends of the main fuel pipe (31) and the secondary fuel pipe (32) are arranged in the accommodating cavity (11); recording the distance from the discharge end of the main fuel pipe (31) to the fire outlet (12) as K ', and recording the distance from the discharge end of the secondary fuel pipe (32) to the fire outlet (12) as N, wherein N & gtK' = K; the distance between the ignition end of the ignition rod (4) and the fire outlet (12) is less than N and greater than K'.
5. The flame detection method of an ignition device according to claim 4, wherein N/K' = 2.2-2.8.
6. The flame detection method of the ignition device according to claim 4, wherein the flame detection device (2) comprises an ion detection module (21), an electrical temperature measurement module (22) for performing ion detection and temperature detection on the pilot flame of the ignition device (1) simultaneously; the ion detection module (21) is a flame ion detector, and the electrical temperature measurement module (22) is a thermocouple thermometer or a thermal resistance thermometer.
7. The flame detection method of an ignition device according to claim 6, wherein the main fuel pipe (31) is coincident with the central axis of the outer pipe (15) of the ignition device (1), the electrical temperature measurement module (22) is disposed on one side of the projected connection between the main fuel pipe (31) and the auxiliary fuel pipe (32), and the ion detection module (21) is disposed on the other side of the projected connection between the main fuel pipe (31) and the auxiliary fuel pipe (32); recording the included angle between the projection connecting line between the electrical temperature measuring module (22) and the main fuel pipe (31) and the projection connecting line between the main fuel pipe (31) and the auxiliary fuel pipe (32) as A, wherein A is 40-60 degrees; the included angle between the projection connection between the ion detection module (21) and the main fuel pipe (31) and the projection connection between the main fuel pipe (31) and the auxiliary fuel pipe (32) is recorded as B, and B is 40-60 degrees.
8. A combustion system comprising an ignition device, wherein the ignition device employs a flame detection method of an ignition device as claimed in any one of claims 1 to 7.
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| CN113237095A (en) | 2021-08-10 |
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