US20180266682A1 - Combustion controlling device and method - Google Patents

Combustion controlling device and method Download PDF

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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
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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
Application number
US15/922,284
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English (en)
Inventor
Takeshi Nishiyama
Yuichi Kumazawa
Shigeki Ishii
Akira Yamada
Satoru Yamagishi
Tomoya Nakata
Kayo Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Azbil Corp
Original Assignee
Azbil Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Azbil Corp filed Critical Azbil Corp
Assigned to AZBIL CORPORATION reassignment AZBIL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUMAZAWA, YUICHI, ISHII, SHIGEKI, Nakata, Tomoya, NISHIYAMA, TAKESHI, SUZUKI, KAYO, YAMADA, AKIRA, YAMAGISHI, SATORU
Publication of US20180266682A1 publication Critical patent/US20180266682A1/en
Abandoned legal-status Critical Current

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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.

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  • 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)
US15/922,284 2017-03-17 2018-03-15 Combustion controlling device and method Abandoned US20180266682A1 (en)

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JP2017052491A JP6824794B2 (ja) 2017-03-17 2017-03-17 燃焼制御装置および方法
JP2017-052491 2017-03-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115711407A (zh) * 2022-11-08 2023-02-24 烟台龙源电力技术股份有限公司 一种等离子体点火系统的控制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111928293A (zh) * 2020-07-29 2020-11-13 湖南柯林瀚特环保科技有限公司 一种火焰检测方法及系统
JP2022029134A (ja) * 2020-08-04 2022-02-17 アズビル株式会社 診断支援装置および診断方法

Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2243602Y (zh) * 1995-02-09 1996-12-25 重庆华夏新技术发展有限公司 锅炉燃烧火焰检测装置
JP4502573B2 (ja) * 2002-10-17 2010-07-14 三浦工業株式会社 燃焼制御装置
JP3943478B2 (ja) * 2002-10-21 2007-07-11 株式会社サムソン 気化促進油焚きバーナにおける火炎検出構造
JP4614078B2 (ja) * 2005-03-31 2011-01-19 株式会社ノーリツ 燃焼機における火炎検知装置
JP2007015328A (ja) * 2005-07-11 2007-01-25 Matsushita Electric Ind Co Ltd 発光体測光装置
CN201028630Y (zh) * 2006-12-28 2008-02-27 黄依华 火焰燃烧指示灯
CN101846340B (zh) * 2009-03-25 2012-12-12 林光湧 点火熄火切断燃气的安全装置及该安全装置的使用方法
CN202546814U (zh) * 2012-01-14 2012-11-21 金字号（福建）燃烧设备有限公司 一种改进火焰信号检测方式的程序控制器
CN104949151A (zh) * 2014-03-31 2015-09-30 上海凌云瑞升燃烧设备有限公司 火焰检测器、燃烧机及火焰检测方法
JP2015200575A (ja) * 2014-04-08 2015-11-12 アズビル株式会社 火炎検出システム
CN104633696B (zh) * 2015-02-28 2017-03-15 烟台龙源电力技术股份有限公司 一种火焰检测方法及火焰检测装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115711407A (zh) * 2022-11-08 2023-02-24 烟台龙源电力技术股份有限公司 一种等离子体点火系统的控制方法

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CN108626743B (zh) 2020-10-23
CN108626743A (zh) 2018-10-09
JP6824794B2 (ja) 2021-02-03
JP2018155442A (ja) 2018-10-04

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