US20180266682A1 - Combustion controlling device and method - Google Patents
Combustion controlling device and method Download PDFInfo
- Publication number
- US20180266682A1 US20180266682A1 US15/922,284 US201815922284A US2018266682A1 US 20180266682 A1 US20180266682 A1 US 20180266682A1 US 201815922284 A US201815922284 A US 201815922284A US 2018266682 A1 US2018266682 A1 US 2018266682A1
- Authority
- US
- United States
- Prior art keywords
- flame
- combustion
- pseudo
- threshold value
- pseudo flame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
- F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
-
- F23N2027/16—
-
- F23N2029/00—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/02—Starting or ignition cycles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/12—Burner simulation or checking
- F23N2227/16—Checking components, e.g. electronic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/18—Applying test signals, e.g. periodic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2229/00—Flame sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/12—Fail safe for ignition failures
Definitions
- the present invention relates to a combustion controlling technique that controls a combustion depending on the presence or absence of a flame detected according to a sensor output of a flame sensor.
- Combustion equipment used in industrial furnaces, boilers, air conditioners, kitchen appliances, heat exchangers, and the like is provided with a flame sensor that detects a light quantity of a flame in a burner and outputs an electrical signal, detects a presence or absence of a flame using a combustion controlling device based on the sensor output of this flame sensor, and controls a combustion based on the sensor according to the detection result.
- such a combustion controlling device detects a presence or absence of a flame based on so-called hysteresis characteristics in which the extinction of a flame is detected at a flame extinction detection level lower than the ignition detection level that is the sensor output during detection of ignition in order to suppress effects of output changes of a flame sensor due to fluctuations of a flame (see, for example, PTL 1 and the like).
- the invention addresses such a problem with an object of providing a combustion controlling technique capable of controlling combustion equipment safely with respect to disturbance light without changing existing combustion equipment.
- a combustion controlling device that controls a combustion in combustion equipment based on a presence or an absence of a combustion flame in the combustion equipment detected from a sensor output of a flame sensor, the combustion controlling device comprising a combustion flame detecting portion that detects a presence or an absence of a combustion flame in the combustion equipment based on the sensor output obtained from the flame sensor during combustion in the combustion equipment and a preset combustion flame threshold value; a pseudo flame detecting portion that detects a presence or an absence of a pseudo flame based on the sensor output and a preset pseudo flame threshold value less than the combustion flame threshold value; and a combustion controlling portion that controls a combustion in the combustion equipment based on a combustion flame detection result obtained by the combustion flame detecting portion, in which the combustion controlling portion monitors a pseudo flame detection result by the pseudo flame detecting portion before an ignition attempt in the combustion equipment and, when the pseudo flame detection result continuously indicates presence of a pseudo flame for a first monitoring time, cancels the ignition attempt in the combustion equipment.
- the combustion flame threshold value includes a first combustion flame threshold value and a second combustion flame threshold value less than the first combustion flame threshold value and the combustion flame detecting portion detects a presence of a combustion flame in the combustion equipment when the sensor output of the flame sensor is equal to or greater than the first combustion flame threshold value and detects an absence of a combustion flame when the sensor output is equal to or less than the second combustion flame threshold value.
- the pseudo flame threshold value includes a first pseudo flame threshold value and a second pseudo flame threshold value less than the first pseudo flame threshold value and the pseudo flame detecting portion detects a presence of a pseudo flame due to disturbance light when the sensor output of the flame sensor is equal to or greater than the first pseudo flame threshold value and detects an absence of a pseudo flame when the sensor output is equal to or less than the second pseudo flame threshold value.
- the combustion controlling portion starts the ignition attempt in the combustion equipment when the pseudo flame detection result continuously indicates an absence of a pseudo flame for a second monitoring time before the ignition attempt.
- a combustion control method that controls a combustion in combustion equipment based on a presence or an absence of a combustion flame in the combustion equipment detected from a sensor output of a flame sensor, the method comprising a combustion flame detecting step in which a combustion flame detecting portion detects a presence or an absence of a combustion flame in the combustion equipment based on the sensor output obtained from the flame sensor during combustion in the combustion equipment and a preset combustion flame threshold value; a pseudo flame detecting step in which a pseudo flame detecting portion detects a presence or an absence of a pseudo flame based on the sensor output and a preset pseudo flame threshold value less than the combustion flame threshold value; and a combustion controlling step in which a combustion controlling portion controls a combustion in the combustion equipment based on a combustion flame detection result obtained in the combustion flame detecting step, in which the combustion controlling step monitors a pseudo flame detection result in the pseudo flame detecting step before an ignition attempt in the combustion equipment and, when the pseudo flame detection result continuously indicates a presence of a pseudo flame
- the combustion equipment can be controlled safely with respect to disturbance light.
- the structure of the burner does not need to be changed to prevent disturbance light from entering the flame sensor. With this, it becomes unnecessary to perform a change to existing combustion equipment, such as an exchange of an existing burner, so a significant increase in the cost for measures can be suppressed.
- FIG. 1 is a block diagram illustrating the structure of the combustion controlling device.
- FIG. 2 is an explanatory diagram illustrating a combustion flame detection operation.
- FIG. 3 is an explanatory diagram illustrating a pseudo flame detection operation.
- FIG. 4 is a flowchart illustrating an ignition attempt execution decision process.
- FIG. 1 is a block diagram illustrating the structure of the combustion controlling device.
- This combustion controlling device 10 performs combustion control of combustion equipment 30 based on a sensor output S from a flame sensor 20 .
- the combustion equipment 30 may be general combustion equipment used in industrial furnaces, boilers, air conditioners, kitchen appliances, heat exchangers, and the like and has the function of generating thermal energy by burning fuel in a burner.
- the flame sensor 20 detects the light quantity of flame in the burner of the combustion equipment 30 , converts the light quantity to electricity, and outputs the electricity to the combustion controlling device 10 as the sensor output S.
- the combustion controlling device 10 is provided with a combustion flame detecting portion 11 , a pseudo flame detecting portion 12 , and a combustion controlling portion 13 as main function portions.
- Each of these function portions may be configured as a controlling circuit comprising ICs or may be achieved in cooperation between a CPU and programs.
- the combustion flame detecting portion 11 has the function of detecting a presence or an absence of a combustion flame in the combustion equipment 30 based on the sensor output S of the flame sensor 20 and a preset combustion flame threshold value.
- a first combustion flame threshold value H 1 ignition detection level
- a second combustion flame threshold value H 2 flame extinction detection level
- FIG. 2 is an explanatory diagram illustrating a combustion flame detection operation.
- the combustion flame detecting portion 11 detects a presence (Bon) of a combustion flame in the combustion equipment 30 when the sensor output S of the flame sensor 20 is equal to or greater than the first combustion flame threshold value H 1 (ignition detection level) and detects an absence (Boff) of a combustion flame when the sensor output S is equal to or less than the second combustion flame threshold value H 2 (flame extinction detection level) less than the first combustion flame threshold value H 1 .
- the pseudo flame detecting portion 12 has the function of detecting a presence or an absence of a pseudo flame due to disturbance light based on the sensor output S of the flame sensor 20 and a preset pseudo flame threshold value.
- a pseudo flame is not a combustion flame that indicates actual combustion in the combustion equipment 30 , but is a quasi-flame in which the level of the sensor output S is raised by effects of disturbance light, such as outside light or stray light.
- a first pseudo flame threshold value H 3 (pseudo flame presence detection level) and a second pseudo flame threshold value H 4 (pseudo flame absence detection level) less than the first pseudo flame threshold value H 3 are used as pseudo flame threshold values.
- FIG. 3 is an explanatory diagram illustrating a pseudo flame detection operation.
- the pseudo flame detecting portion 12 detects a presence (Pon) of a pseudo flame due to disturbance light when the sensor output S of the flame sensor 20 is equal to or greater than the pseudo flame threshold value H 3 (pseudo flame presence detection level) and detects an absence (Poff) of a pseudo flame when the sensor output S is equal to or less than the pseudo flame threshold value H 4 (pseudo flame absence detection level).
- a presence or an absence of a pseudo flame can be detected more strictly by making the pseudo flame threshold values H 3 and H 4 less than the second combustion flame threshold value H 2 .
- the pseudo flame threshold values H 3 and H 4 may be changed adaptively.
- hysteresis characteristics are not necessary for the invention and pseudo flame threshold values H 3 and H 4 only need to be set to the same value when hysteresis characteristics are not applied.
- the combustion controlling portion 13 has the function of controlling combustion in the combustion equipment 30 based on a combustion flame detection result B from the combustion flame detecting portion 11 during combustion in the combustion equipment 30 .
- the combustion control performed here is the same as the conventional one.
- a control signal C for instructing the supply of fuel to the burner is output to the combustion equipment 30 .
- a control signal C for instructing the stopping of the supply of fuel to the burner is output to the combustion equipment 30 .
- the combustion controlling portion 13 monitors a pseudo flame detection result P from the pseudo flame detecting portion 12 before an ignition attempt in the combustion equipment 30 , cancels the ignition attempt in the combustion equipment 30 when the pseudo flame detection result P continuously indicates a presence of a pseudo flame for a preset first monitoring time T 1 , and starts an ignition attempt in the combustion equipment 30 when the pseudo flame detection result P continuously indicates an absence of a pseudo flame for a preset second monitoring time before the ignition attempt.
- the operation of the combustion equipment 30 may be completely stopped by making a lockout of the combustion equipment 30 continuously for a certain time.
- a lockout may be made immediately or a lockout may not be made after a certain period of waiting is performed.
- FIG. 4 is a flowchart illustrating an ignition attempt execution decision process.
- the combustion controlling portion 13 makes the ignition attempt execution decision process illustrated in FIG. 4 before starting an ignition attempt in the combustion equipment 30 .
- the combustion controlling portion 13 obtains the pseudo flame detection result P from the pseudo flame detecting portion 12 (step 100 ).
- the combustion controlling portion 13 starts an ignition attempt in the combustion equipment 30 (step 102 ) and ends a series of the ignition attempt execution decision processes.
- the combustion controlling portion 13 starts the combustion control of the combustion equipment 30 based on the combustion flame detection result B from the combustion flame detecting portion 11 .
- the combustion controlling portion 13 starts monitoring the pseudo flame detection result P after that (step 103 ).
- the combustion controlling portion 13 cancels the ignition attempt in the combustion equipment 30 (step 105 ) and ends a series of the ignition attempt execution decision processes.
- the combustion controlling portion 13 may stop the operation of the combustion equipment 30 (that is, a lockout) as a specific example of canceling the ignition attempt. This can provide a high level of safety.
- the processing proceeds to step 102 and the combustion controlling portion 13 starts an ignition attempt in the combustion equipment 30 .
- step 106 when a presence (Pon) of a pseudo flame does not continue for the first monitoring time and an absence (Poff) of a pseudo flame does not continue for the second monitoring time (NO in step 106 ), the processing returns to step 103 and the combustion controlling portion 13 continues the monitoring of the pseudo flame detection result P.
- the first monitoring time and the second monitoring time only need to be preset depending on the combustion equipment 30 that is a control target and the first monitoring time and the second monitoring time may be set to the same value.
- the pseudo flame detecting portion 12 detects a presence (Pon) of a pseudo flame due to disturbance light when the sensor output S of the flame sensor 20 is equal to or greater than the pseudo flame threshold value H 3 and detects an absence (Poff) of a pseudo flame when the sensor output S is equal to or less than the pseudo flame threshold value H 4 .
- the combustion controlling portion 13 monitors the pseudo flame detection result P from the pseudo flame detecting portion 12 before an ignition attempt in the combustion equipment 30 and cancels the ignition attempt in the combustion equipment 30 when the pseudo flame detection result P continuously indicates a presence of a pseudo flame for the first monitoring time.
- the combustion equipment 30 can be controlled safely with respect to disturbance light.
- the combustion controlling device 10 since a presence or an absence of a pseudo flame due to disturbance light is detected by the combustion controlling device 10 , the structure of the burner does not need to be changed to prevent disturbance light from entering the flame sensor 20 . With this, it becomes unnecessary to perform a change to the existing combustion equipment 30 , such as an exchange of an existing burner, so a significant increase in the cost for measures can be suppressed.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
Description
- The present application claims the benefit of and priority to Japanese Patent Application No. 2017-052491, filed on Mar. 17, 2017, the entire contents of which are incorporated by reference herein.
- The present invention relates to a combustion controlling technique that controls a combustion depending on the presence or absence of a flame detected according to a sensor output of a flame sensor.
- Combustion equipment used in industrial furnaces, boilers, air conditioners, kitchen appliances, heat exchangers, and the like is provided with a flame sensor that detects a light quantity of a flame in a burner and outputs an electrical signal, detects a presence or absence of a flame using a combustion controlling device based on the sensor output of this flame sensor, and controls a combustion based on the sensor according to the detection result.
- Conventionally, such a combustion controlling device detects a presence or absence of a flame based on so-called hysteresis characteristics in which the extinction of a flame is detected at a flame extinction detection level lower than the ignition detection level that is the sensor output during detection of ignition in order to suppress effects of output changes of a flame sensor due to fluctuations of a flame (see, for example, PTL 1 and the like).
- [PTL 1] JP-B-7-15328
- [PTL 2] Japanese Patent No. 3943478
- However, since the presence or an absence of a flame is detected by comparing the sensor output of the flame sensor with a threshold value in the related art described above, in an environment in which there is a pseudo flame having a light quantity equal to or higher than the flame extinction detection level and equal to or lower than the ignition detection level due to effects of disturbance light, such as outside light or stray light, even if a flame is extinguished after ignition, the sensor output of the flame sensor may not be reduced to the flame extinction detection level. Since the flame extinction cannot be detected in such a case, fuel continues to be output after extinction and a very dangerous state may be entered.
- There is a proposed technique for preventing disturbance light from entering the flame sensor by improving the burner structure to suppress effects of such disturbances (see, for example, PTL 2 or the like). However, since the measure against the problem depends on the equipment manufacturer, not all combustion devices surely take the measure described above. In addition, application of the burner structure described above significantly increases the cost for measures since a change to existing combustion equipment, such as an exchange of an existing burner, is necessary.
- The invention addresses such a problem with an object of providing a combustion controlling technique capable of controlling combustion equipment safely with respect to disturbance light without changing existing combustion equipment.
- To achieve the object described above, according to the invention, there is provided a combustion controlling device that controls a combustion in combustion equipment based on a presence or an absence of a combustion flame in the combustion equipment detected from a sensor output of a flame sensor, the combustion controlling device comprising a combustion flame detecting portion that detects a presence or an absence of a combustion flame in the combustion equipment based on the sensor output obtained from the flame sensor during combustion in the combustion equipment and a preset combustion flame threshold value; a pseudo flame detecting portion that detects a presence or an absence of a pseudo flame based on the sensor output and a preset pseudo flame threshold value less than the combustion flame threshold value; and a combustion controlling portion that controls a combustion in the combustion equipment based on a combustion flame detection result obtained by the combustion flame detecting portion, in which the combustion controlling portion monitors a pseudo flame detection result by the pseudo flame detecting portion before an ignition attempt in the combustion equipment and, when the pseudo flame detection result continuously indicates presence of a pseudo flame for a first monitoring time, cancels the ignition attempt in the combustion equipment.
- In addition, in one example of the configuration of the combustion controlling device according to the invention, the combustion flame threshold value includes a first combustion flame threshold value and a second combustion flame threshold value less than the first combustion flame threshold value and the combustion flame detecting portion detects a presence of a combustion flame in the combustion equipment when the sensor output of the flame sensor is equal to or greater than the first combustion flame threshold value and detects an absence of a combustion flame when the sensor output is equal to or less than the second combustion flame threshold value.
- In addition, in one example of the configuration of the combustion controlling device according to the invention, the pseudo flame threshold value includes a first pseudo flame threshold value and a second pseudo flame threshold value less than the first pseudo flame threshold value and the pseudo flame detecting portion detects a presence of a pseudo flame due to disturbance light when the sensor output of the flame sensor is equal to or greater than the first pseudo flame threshold value and detects an absence of a pseudo flame when the sensor output is equal to or less than the second pseudo flame threshold value.
- In addition, in one example of the configuration of the combustion controlling device according to the invention, the combustion controlling portion starts the ignition attempt in the combustion equipment when the pseudo flame detection result continuously indicates an absence of a pseudo flame for a second monitoring time before the ignition attempt.
- In addition, according to the invention, there is provided a combustion control method that controls a combustion in combustion equipment based on a presence or an absence of a combustion flame in the combustion equipment detected from a sensor output of a flame sensor, the method comprising a combustion flame detecting step in which a combustion flame detecting portion detects a presence or an absence of a combustion flame in the combustion equipment based on the sensor output obtained from the flame sensor during combustion in the combustion equipment and a preset combustion flame threshold value; a pseudo flame detecting step in which a pseudo flame detecting portion detects a presence or an absence of a pseudo flame based on the sensor output and a preset pseudo flame threshold value less than the combustion flame threshold value; and a combustion controlling step in which a combustion controlling portion controls a combustion in the combustion equipment based on a combustion flame detection result obtained in the combustion flame detecting step, in which the combustion controlling step monitors a pseudo flame detection result in the pseudo flame detecting step before an ignition attempt in the combustion equipment and, when the pseudo flame detection result continuously indicates a presence of a pseudo flame for a first monitoring time, cancels the ignition attempt in the combustion equipment.
- According to the invention, when the pseudo flame detection result from the pseudo flame detecting portion continues for the first monitoring time even though combustion in the burner does not start before an ignition attempt, since such disturbance light is detected constantly and combustion flame may not be detected accurately if combustion in the burner is started, the ignition attempt in the combustion equipment is canceled. Accordingly, the combustion equipment can be controlled safely with respect to disturbance light. In addition, since a presence or an absence of a pseudo flame due to disturbance light is detected by the combustion controlling device, the structure of the burner does not need to be changed to prevent disturbance light from entering the flame sensor. With this, it becomes unnecessary to perform a change to existing combustion equipment, such as an exchange of an existing burner, so a significant increase in the cost for measures can be suppressed.
-
FIG. 1 is a block diagram illustrating the structure of the combustion controlling device. -
FIG. 2 is an explanatory diagram illustrating a combustion flame detection operation. -
FIG. 3 is an explanatory diagram illustrating a pseudo flame detection operation. -
FIG. 4 is a flowchart illustrating an ignition attempt execution decision process. - Next, an embodiment of the invention will be described with reference to the drawings.
- First, a combustion controlling
device 10 according to the embodiment will be described with reference toFIG. 1 .FIG. 1 is a block diagram illustrating the structure of the combustion controlling device. - This
combustion controlling device 10 performs combustion control ofcombustion equipment 30 based on a sensor output S from aflame sensor 20. - The
combustion equipment 30 may be general combustion equipment used in industrial furnaces, boilers, air conditioners, kitchen appliances, heat exchangers, and the like and has the function of generating thermal energy by burning fuel in a burner. - The
flame sensor 20 detects the light quantity of flame in the burner of thecombustion equipment 30, converts the light quantity to electricity, and outputs the electricity to thecombustion controlling device 10 as the sensor output S. - The combustion controlling
device 10 is provided with a combustionflame detecting portion 11, a pseudoflame detecting portion 12, and acombustion controlling portion 13 as main function portions. Each of these function portions may be configured as a controlling circuit comprising ICs or may be achieved in cooperation between a CPU and programs. - The combustion
flame detecting portion 11 has the function of detecting a presence or an absence of a combustion flame in thecombustion equipment 30 based on the sensor output S of theflame sensor 20 and a preset combustion flame threshold value. When hysteresis characteristics are applied to the detection of combustion flame, a first combustion flame threshold value H1 (ignition detection level) and a second combustion flame threshold value H2 (flame extinction detection level) that is less than the first combustion flame threshold value H1 are used as combustion flame threshold values. -
FIG. 2 is an explanatory diagram illustrating a combustion flame detection operation. The combustionflame detecting portion 11 detects a presence (Bon) of a combustion flame in thecombustion equipment 30 when the sensor output S of theflame sensor 20 is equal to or greater than the first combustion flame threshold value H1 (ignition detection level) and detects an absence (Boff) of a combustion flame when the sensor output S is equal to or less than the second combustion flame threshold value H2 (flame extinction detection level) less than the first combustion flame threshold value H1. - The pseudo
flame detecting portion 12 has the function of detecting a presence or an absence of a pseudo flame due to disturbance light based on the sensor output S of theflame sensor 20 and a preset pseudo flame threshold value. A pseudo flame is not a combustion flame that indicates actual combustion in thecombustion equipment 30, but is a quasi-flame in which the level of the sensor output S is raised by effects of disturbance light, such as outside light or stray light. When hysteresis characteristics are applied to the detection of a pseudo flame, a first pseudo flame threshold value H3 (pseudo flame presence detection level) and a second pseudo flame threshold value H4 (pseudo flame absence detection level) less than the first pseudo flame threshold value H3 are used as pseudo flame threshold values. -
FIG. 3 is an explanatory diagram illustrating a pseudo flame detection operation. The pseudoflame detecting portion 12 detects a presence (Pon) of a pseudo flame due to disturbance light when the sensor output S of theflame sensor 20 is equal to or greater than the pseudo flame threshold value H3 (pseudo flame presence detection level) and detects an absence (Poff) of a pseudo flame when the sensor output S is equal to or less than the pseudo flame threshold value H4 (pseudo flame absence detection level). At this time, a presence or an absence of a pseudo flame can be detected more strictly by making the pseudo flame threshold values H3 and H4 less than the second combustion flame threshold value H2. It should be noted that the pseudo flame threshold values H3 and H4 may be changed adaptively. In addition, although stable detection can be achieved by applying hysteresis characteristics to the detection of a pseudo flame, hysteresis characteristics are not necessary for the invention and pseudo flame threshold values H3 and H4 only need to be set to the same value when hysteresis characteristics are not applied. - The
combustion controlling portion 13 has the function of controlling combustion in thecombustion equipment 30 based on a combustion flame detection result B from the combustionflame detecting portion 11 during combustion in thecombustion equipment 30. The combustion control performed here is the same as the conventional one. For example, when the combustion flame detection result B indicates a presence (Bon) of a combustion flame, a control signal C for instructing the supply of fuel to the burner is output to thecombustion equipment 30. When the combustion flame detection result B indicates an absence (Boff) of a combustion flame, a control signal C for instructing the stopping of the supply of fuel to the burner is output to thecombustion equipment 30. - In addition, the
combustion controlling portion 13 monitors a pseudo flame detection result P from the pseudoflame detecting portion 12 before an ignition attempt in thecombustion equipment 30, cancels the ignition attempt in thecombustion equipment 30 when the pseudo flame detection result P continuously indicates a presence of a pseudo flame for a preset first monitoring time T1, and starts an ignition attempt in thecombustion equipment 30 when the pseudo flame detection result P continuously indicates an absence of a pseudo flame for a preset second monitoring time before the ignition attempt. - When the pseudo flame detection result P indicates a presence of a pseudo flame, the operation of the
combustion equipment 30 may be completely stopped by making a lockout of thecombustion equipment 30 continuously for a certain time. In addition, when the pseudo flame detection result P indicates a presence of a pseudo flame, a lockout may be made immediately or a lockout may not be made after a certain period of waiting is performed. - Next, the operation of the
combustion controlling device 10 according to the embodiment will be described with reference toFIG. 4 .FIG. 4 is a flowchart illustrating an ignition attempt execution decision process. - The
combustion controlling portion 13 makes the ignition attempt execution decision process illustrated inFIG. 4 before starting an ignition attempt in thecombustion equipment 30. - First, the
combustion controlling portion 13 obtains the pseudo flame detection result P from the pseudo flame detecting portion 12 (step 100). When the sensor output S of theflame sensor 20 is equal to or less than the pseudo flame threshold value H4 and the pseudo flame detection result P indicates an absence (Poff) of a pseudo flame (NO in step 101), thecombustion controlling portion 13 starts an ignition attempt in the combustion equipment 30 (step 102) and ends a series of the ignition attempt execution decision processes. After that, thecombustion controlling portion 13 starts the combustion control of thecombustion equipment 30 based on the combustion flame detection result B from the combustionflame detecting portion 11. - In contrast, when the sensor output S of the
flame sensor 20 is equal to or greater than the pseudo flame threshold value H3 and the pseudo flame detection result P indicates a presence (Pon) of a pseudo flame (YES in step 101), thecombustion controlling portion 13 starts monitoring the pseudo flame detection result P after that (step 103). - When the sensor output S of the
flame sensor 20 is kept at the pseudo flame threshold value H3, or greater, and the pseudo flame detection result P continuously indicates a presence (Pon) of a pseudo flame for the first monitoring time (YES in step 104), since disturbance light is detected constantly by theflame sensor 20 and combustion flame may not be detected accurately, thecombustion controlling portion 13 cancels the ignition attempt in the combustion equipment 30 (step 105) and ends a series of the ignition attempt execution decision processes. At this time, thecombustion controlling portion 13 may stop the operation of the combustion equipment 30 (that is, a lockout) as a specific example of canceling the ignition attempt. This can provide a high level of safety. - In addition, when the pseudo flame detection result P does not continuously indicate a presence (Pon) of a pseudo flame for the first monitoring time (NO in step 104) and the pseudo flame detection result P continuously indicates an absence (Poff) of a pseudo flame for the second monitoring time (YES in step 106), since the
flame sensor 20 can detect combustion flame accurately because it does not detect disturbance light, the processing proceeds to step 102 and thecombustion controlling portion 13 starts an ignition attempt in thecombustion equipment 30. - Alternatively, when a presence (Pon) of a pseudo flame does not continue for the first monitoring time and an absence (Poff) of a pseudo flame does not continue for the second monitoring time (NO in step 106), the processing returns to step 103 and the
combustion controlling portion 13 continues the monitoring of the pseudo flame detection result P. - The first monitoring time and the second monitoring time only need to be preset depending on the
combustion equipment 30 that is a control target and the first monitoring time and the second monitoring time may be set to the same value. - As described above, in the embodiment, the pseudo
flame detecting portion 12 detects a presence (Pon) of a pseudo flame due to disturbance light when the sensor output S of theflame sensor 20 is equal to or greater than the pseudo flame threshold value H3 and detects an absence (Poff) of a pseudo flame when the sensor output S is equal to or less than the pseudo flame threshold value H4. Thecombustion controlling portion 13 monitors the pseudo flame detection result P from the pseudoflame detecting portion 12 before an ignition attempt in thecombustion equipment 30 and cancels the ignition attempt in thecombustion equipment 30 when the pseudo flame detection result P continuously indicates a presence of a pseudo flame for the first monitoring time. - Accordingly, when the pseudo flame detection result P from the pseudo
flame detecting portion 12 continues for the first monitoring time even though combustion in the burner does not start before an ignition attempt, since such disturbance light is detected constantly and combustion flame may not be detected accurately if combustion in the burner is started, the ignition attempt in thecombustion equipment 30 is canceled. Accordingly, thecombustion equipment 30 can be controlled safely with respect to disturbance light. In addition, since a presence or an absence of a pseudo flame due to disturbance light is detected by thecombustion controlling device 10, the structure of the burner does not need to be changed to prevent disturbance light from entering theflame sensor 20. With this, it becomes unnecessary to perform a change to the existingcombustion equipment 30, such as an exchange of an existing burner, so a significant increase in the cost for measures can be suppressed. - Although the invention has been described above with reference to the embodiment, the invention is not limited to the above embodiment. Various changes understandable to those skilled in the art can be made to the structure and details of the invention within the scope of the invention.
- 10: combustion controlling device; 11: combustion flame detecting portion; 12: pseudo flame detecting portion; 13: combustion controlling portion; 20: flame sensor; 30: combustion equipment; S: sensor output; H1: first combustion flame threshold value; H2: second combustion flame threshold value; H3: first pseudo flame threshold value; H4: second pseudo flame threshold value; B: combustion flame detection result; P: pseudo flame detection result: C: control signal
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017-052491 | 2017-03-17 | ||
JP2017052491A JP6824794B2 (en) | 2017-03-17 | 2017-03-17 | Combustion control device and method |
Publications (1)
Publication Number | Publication Date |
---|---|
US20180266682A1 true US20180266682A1 (en) | 2018-09-20 |
Family
ID=63519155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/922,284 Abandoned US20180266682A1 (en) | 2017-03-17 | 2018-03-15 | Combustion controlling device and method |
Country Status (3)
Country | Link |
---|---|
US (1) | US20180266682A1 (en) |
JP (1) | JP6824794B2 (en) |
CN (1) | CN108626743B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115711407A (en) * | 2022-11-08 | 2023-02-24 | 烟台龙源电力技术股份有限公司 | Control method of plasma ignition system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111928293A (en) * | 2020-07-29 | 2020-11-13 | 湖南柯林瀚特环保科技有限公司 | Flame detection method and system |
JP2022029134A (en) * | 2020-08-04 | 2022-02-17 | アズビル株式会社 | Diagnosis supporting device and diagnosing method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150369668A1 (en) * | 2013-01-21 | 2015-12-24 | Panasonic Intellectual Property Management Co., Ltd. | Infrared detection element, infrared detector, and infrared type gas sensor |
US20160348906A1 (en) * | 2015-05-26 | 2016-12-01 | Azbil Corporation | Flame detecting system |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2243602Y (en) * | 1995-02-09 | 1996-12-25 | 重庆华夏新技术发展有限公司 | Flame analyzer for combustion of boiler |
JP4502573B2 (en) * | 2002-10-17 | 2010-07-14 | 三浦工業株式会社 | Combustion control device |
JP3943478B2 (en) * | 2002-10-21 | 2007-07-11 | 株式会社サムソン | Flame detection structure in a vaporization-promoting oil-fired burner |
JP4614078B2 (en) * | 2005-03-31 | 2011-01-19 | 株式会社ノーリツ | Flame detection device in a combustor |
JP2007015328A (en) * | 2005-07-11 | 2007-01-25 | Matsushita Electric Ind Co Ltd | Photometry device for illuminant |
CN201028630Y (en) * | 2006-12-28 | 2008-02-27 | 黄依华 | Flame combustion indicator light |
CN101846340B (en) * | 2009-03-25 | 2012-12-12 | 林光湧 | Safety device for igniting, extinguishing and cutting off gas and use method thereof |
CN202546814U (en) * | 2012-01-14 | 2012-11-21 | 金字号(福建)燃烧设备有限公司 | Programmable controller in improved flame signal detecting mode |
CN104949151A (en) * | 2014-03-31 | 2015-09-30 | 上海凌云瑞升燃烧设备有限公司 | Flame detector, combustor and flame detecting method |
JP2015200575A (en) * | 2014-04-08 | 2015-11-12 | アズビル株式会社 | flame detection system |
CN104633696B (en) * | 2015-02-28 | 2017-03-15 | 烟台龙源电力技术股份有限公司 | A kind of flame detecting method and flame detecting device |
-
2017
- 2017-03-17 JP JP2017052491A patent/JP6824794B2/en active Active
-
2018
- 2018-03-15 US US15/922,284 patent/US20180266682A1/en not_active Abandoned
- 2018-03-16 CN CN201810218779.2A patent/CN108626743B/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150369668A1 (en) * | 2013-01-21 | 2015-12-24 | Panasonic Intellectual Property Management Co., Ltd. | Infrared detection element, infrared detector, and infrared type gas sensor |
US20160348906A1 (en) * | 2015-05-26 | 2016-12-01 | Azbil Corporation | Flame detecting system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115711407A (en) * | 2022-11-08 | 2023-02-24 | 烟台龙源电力技术股份有限公司 | Control method of plasma ignition system |
Also Published As
Publication number | Publication date |
---|---|
CN108626743B (en) | 2020-10-23 |
JP6824794B2 (en) | 2021-02-03 |
JP2018155442A (en) | 2018-10-04 |
CN108626743A (en) | 2018-10-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20180266682A1 (en) | Combustion controlling device and method | |
US4457692A (en) | Dual firing rate flame sensing system | |
US20180266683A1 (en) | Combustion controlling device and method | |
KR101804463B1 (en) | A in-cable control box for electric vehicle and charging control method using the same | |
CN102207292B (en) | Combustion controlling device | |
JP6335821B2 (en) | Combustion control device and combustion system | |
KR101846360B1 (en) | Electric range having safety function and safety control method of the electric range | |
US7090140B2 (en) | Method and device for monitoring burners | |
JP6815034B2 (en) | Flame detector | |
JP5847563B2 (en) | Gas leak alarm | |
JP2011007374A (en) | Multi-can installation system for boiler | |
CN214332673U (en) | Boiler superheater control system | |
KR20030075801A (en) | Protection circuit of plasma display panel | |
EP3327351A1 (en) | Method for operating a fan assisted, atmospheric gas burner appliance | |
US20230143249A1 (en) | Safe start-up of a cooled radiant tube burner at high temperature operation | |
KR102026248B1 (en) | Apparatus for Line Condition Detecting of Radiant Heater of Electric Range | |
CN112082179A (en) | Gas flameout protection method, device, equipment and computer readable storage medium | |
JP5962338B2 (en) | Stove | |
JP5121561B2 (en) | Combustion state detection device | |
CA3058603C (en) | Multiple spark and multiple sense igniter assembly and system | |
CN112443829A (en) | Boiler superheater control system and control method | |
JP2023104458A (en) | Combustion control system, and method for estimating abnormality | |
JPS63156921A (en) | Abnormality detector in flame detection circuit | |
KR100442375B1 (en) | Method for protection against over heating of lcd projector | |
JP5035748B2 (en) | High pressure discharge lamp lighting device and control method thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: AZBIL CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NISHIYAMA, TAKESHI;KUMAZAWA, YUICHI;ISHII, SHIGEKI;AND OTHERS;SIGNING DATES FROM 20180307 TO 20180308;REEL/FRAME:045272/0248 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |