WO2016157925A1 - Dispositif de chaudière - Google Patents

Dispositif de chaudière Download PDF

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Publication number
WO2016157925A1
WO2016157925A1 PCT/JP2016/050484 JP2016050484W WO2016157925A1 WO 2016157925 A1 WO2016157925 A1 WO 2016157925A1 JP 2016050484 W JP2016050484 W JP 2016050484W WO 2016157925 A1 WO2016157925 A1 WO 2016157925A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gas
boiler
line
fuel
fuel gas
Prior art date
Application number
PCT/JP2016/050484
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English (en)
Japanese (ja)
Inventor
亮 宮川
Original Assignee
三浦工業株式会社
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 三浦工業株式会社 filed Critical 三浦工業株式会社
Priority to KR1020177007385A priority Critical patent/KR20170134957A/ko
Priority to JP2017509309A priority patent/JPWO2016157925A1/ja
Publication of WO2016157925A1 publication Critical patent/WO2016157925A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/007—Regulating fuel supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply

Definitions

  • the present invention relates to a boiler device that performs exhaust gas circulation.
  • This application claims priority based on Japanese Patent Application No. 2015-071633 for which it applied to Japan on March 31, 2015, and uses the content here.
  • Patent Document 1 discloses such a boiler apparatus.
  • Patent Document 1 discloses a configuration that prevents ignition failure caused by excess air by suppressing the amount of combustion air supplied during ignition when exhaust gas is not circulated.
  • a boiler device that circulates exhaust gas performs combustion adjustment based on the normal combustion state in which the exhaust gas is circulated. Therefore, oxygen is not mixed in an exhaust gas having a lower oxygen concentration than the combustion air. The concentration will be higher than expected.
  • the exhaust gas ratio is adjusted to be high during normal combustion, the difference in the amount of oxygen contained in the combustion air becomes large between ignition when the exhaust gas is not circulated and normal combustion.
  • Patent Document 1 although the opening degree of the damper is controlled to prevent harmful effects caused by excess oxygen at the time of ignition, it is necessary to add damper control at the time of ignition.
  • An object of the present invention is to provide a configuration capable of reliably preventing excessive oxygen concentration during ignition and realizing stable ignition in a boiler device that performs exhaust gas circulation.
  • the present invention includes a boiler, a fuel supply line for supplying fuel gas to the boiler, an air supply line for supplying combustion air mixed with the fuel gas to the boiler, and a blower connected to the air supply line.
  • An air supply unit a burner which is disposed inside the boiler and combusts an air-fuel mixture of the fuel gas and the combustion air, an exhaust line which exhausts exhaust gas generated by the combustion of the air-fuel mixture, and the exhaust
  • An exhaust gas circulation line that connects the line and the air supply unit, and circulates part of the exhaust gas to the air supply unit, and an end on one side and an end on the other side are connected on the path of the fuel supply line.
  • bypass line The bypass line, the bypass valve disposed in the bypass line, and close the bypass valve during normal combustion, and open the bypass valve when the burner ignites.
  • serial bypass line circulating the fuel gas, and a control unit in comparison with a normal combustion control is performed to increase the supply amount of the fuel gas to a boiler apparatus, characterized in that it comprises a.
  • the boiler device further includes a fuel gas decompression member that is disposed in the fuel supply line and decompresses the fuel gas, and the bypass line has one end connected to the upstream side of the fuel gas decompression member, The other end is preferably connected to the downstream side of the fuel gas decompression member.
  • the boiler device further includes an exhaust gas flow rate adjusting unit that is disposed in the exhaust gas circulation line and adjusts the flow rate of the exhaust gas, and the control unit does not supply the exhaust gas to the air supply unit when the burner is ignited. It is preferable to adjust the exhaust gas flow rate adjusting unit so that the exhaust gas flow rate adjusting unit is adjusted so that supply of the exhaust gas to the air supply unit is started after a predetermined time has elapsed since the ignition of the burner.
  • FIG. 4 is a timing chart schematically showing opening / closing control of a bypass valve and an exhaust gas flow rate adjustment damper before and after ignition.
  • the boiler apparatus 1 of this embodiment is a steam boiler that generates steam by heating water, and supplies steam to a load device (not shown).
  • the “line” in the present specification is a general term for lines capable of flowing a fluid such as a flow path, a path, and a pipeline.
  • the boiler apparatus 1 of this embodiment is the boiler 2, the fuel supply part 3, the air supply part 4, the exhaust gas circulation line 19, the steam line 20, the water supply part 5, and the control apparatus. 6.
  • the boiler 2 includes a boiler casing 11, a plurality of water pipes 12 disposed inside the boiler casing 11, an air supply duct 17 in which combustion air is mixed with fuel gas, and a mixture of fuel gas and combustion air.
  • a burner 15 that burns air and an exhaust cylinder 18 as an exhaust line that exhausts exhaust gas to the outside of the boiler casing 11 are provided.
  • the boiler casing 11 is formed in a rectangular parallelepiped shape in plan view.
  • the plurality of water tubes 12 are arranged inside the boiler housing 11 with a predetermined interval in the longitudinal direction and the width direction.
  • the plurality of water pipes 12 are held inside the boiler casing 11 with their upper ends connected to an upper header (not shown) and their lower ends connected to a lower header (not shown).
  • casing 11 is not limited to what is formed in the above-mentioned rectangular parallelepiped shape.
  • a boiler housing formed in a round shape can be used.
  • the air supply duct 17 is connected to one end side of the boiler casing 11 in the longitudinal direction. Fuel gas is supplied from the fuel supply unit 3 to the air supply duct 17 and combustion air is supplied from the air supply unit 4.
  • the burner 15 is disposed in a portion (air supply port) to which the air supply duct 17 is connected in the boiler casing 11, burns a mixture of fuel gas and combustion air, and superheats water in the plurality of water pipes 12. Generate steam.
  • the exhaust cylinder 18 is a discharge line for discharging exhaust gas generated by combustion to the outside of the boiler casing 11, and is connected to the other end side in the longitudinal direction of the boiler casing 11.
  • the fuel supply unit 3 is configured to supply fuel to the boiler 2.
  • the fuel supply unit 3 includes a fuel supply line 31, a governor 32, an on-off valve 33, a first orifice 34, a second orifice 35, a bypass line 36, and a bypass valve 37.
  • the fuel supply line 31 has an upstream end connected to a fuel supply source (not shown) and a downstream end connected to the air supply duct 17.
  • the governor 32 is a pressure adjusting unit that adjusts the pressure of the fuel gas flowing through the fuel supply line 31.
  • the governor 32 of the present embodiment receives the pressure of the air supply line 42 by a communication pipe (not shown) connected to the air supply line 42, and the fuel gas is supplied to the supply amount of combustion air by a so-called equalizing valve system. It has a function as a proportional control valve for controlling the flow rate of the fuel gas so that the supply amount of fuel is proportional.
  • the on-off valve 33 is disposed on the downstream side of the governor 32.
  • the on-off valve 33 can open or close the flow path of the fuel supply line 31.
  • the first orifice 34 is disposed on the downstream side of the on-off valve 33 and decompresses the fuel gas.
  • the second orifice 35 is a fuel gas decompression member that decompresses the fuel gas, and is disposed on the downstream side of the first orifice 34.
  • the bypass line 36 is connected to the upstream side of the second orifice 35 and to the downstream side.
  • the bypass valve 37 is disposed in the bypass line 36.
  • the bypass valve 37 is an electromagnetic valve that opens or closes the flow path of the bypass line 36.
  • combustion adjustment at the time of normal combustion is performed based on the state where the bypass valve 37 is closed and the flow path of the bypass line 36 is closed.
  • the normal combustion here means a combustion state after ignition (for example, a state in which steam generated by the boiler 2 is supplied to the load device).
  • the air supply unit 4 is configured to supply combustion air to the boiler 2.
  • the air supply unit 4 of this embodiment includes a blower 41, an air supply line 42, and a combustion air damper 43.
  • the blower 41 includes a fan, a motor that rotates the fan, and an inverter.
  • the blower 41 can adjust the rotation speed of the motor according to the frequency input to the inverter.
  • An exhaust gas circulation line 19 to be described later is connected to the blower 41 so that a part of the exhaust gas discharged from the boiler casing 11 to the outside can be introduced into the blower 41.
  • the air supply line 42 has an upstream end connected to the blower 41 and a downstream end connected to the air supply duct 17.
  • the blower 41 takes in air by rotation of the fan, and sends combustion air to the boiler 2 through the air supply line 42.
  • the combustion air damper 43 is connected to the air supply line 42 so as to be rotatable between a closed state in which the combustion air flow path is closed and an open state in which the combustion air flow path is opened and the combustion air flow path is opened. Be placed. Further, the combustion air damper 43 is configured to be able to change the opening degree in order to adjust the supply amount of the combustion air.
  • the exhaust gas circulation line 19 has an upstream end connected to the exhaust pipe 18 and a downstream end connected to the blower 41 (air supply unit 4). A part of the exhaust gas discharged from the inside of the boiler housing 11 to the exhaust pipe 18 is sent to the blower 41 by the exhaust gas circulation line 19, mixed with outside air, and sent again to the boiler 2.
  • an exhaust gas flow adjustment damper 27 is arranged in the exhaust gas circulation line 19, an exhaust gas flow adjustment damper 27 is arranged.
  • the exhaust gas flow rate adjustment damper 27 is a so-called multi-position damper whose opening degree can be adjusted.
  • the exhaust gas flow rate adjusting damper 27 of the present embodiment closes the exhaust gas flow path inside the exhaust gas circulation line 19 and rotates a predetermined angle (for example, 90 degrees) from this closed state, thereby changing the exhaust gas flow path. It can be rotated between the open state and the open state.
  • the exhaust gas flow rate adjustment damper 27 is a multi-position damper as described above, and the opening degree in the open state can be adjusted. With this function, the mixing ratio of the exhaust gas sent to the blower 41 can be adjusted.
  • the exhaust gas flow rate adjustment damper 27 functions as an exhaust gas flow rate adjustment unit that can adjust whether or not to supply exhaust gas to the blower 41, including the adjustment of the flow rate, by being configured so that the opening degree can be adjusted.
  • the exhaust gas flow path inside the exhaust gas circulation line 19 is opened, and the normal combustion adjustment is performed based on the state where a part of the exhaust gas is introduced into the blower 41. .
  • the steam line 20 has an upstream end connected to the boiler 2 and a downstream end connected to a load device (not shown). Steam generated in the boiler 2 is supplied to the load device via the steam line 20.
  • the water supply unit 5 is configured to supply water for generating steam to the boiler 2.
  • the water supply unit 5 of the present embodiment includes a water supply line 51 and a heat exchanger 52.
  • the water supply line 51 has an upstream end connected to a water supply source (not shown) and a downstream end connected to the boiler 2.
  • the heat exchanger 52 is disposed inside the exhaust pipe 18. The heat exchanger 52 performs heat exchange between the water flowing inside the water supply line 51 and the exhaust gas flowing through the exhaust pipe 18. Thereby, the water flowing through the water supply line 51 is supplied to the boiler 2 in a preheated state.
  • the control device 6 is electrically connected to the blower 41, the combustion air damper 43, the bypass valve 37, each pressure sensor, and the like.
  • the control device 6 of this embodiment includes a control unit 61 and a storage unit 62.
  • the controller 61 performs various controls such as adjustment of the supply amounts of fuel gas and combustion air, ignition control of the boiler 2, and combustion control.
  • the storage unit 62 stores various types of information for the control unit 61 to perform control.
  • the control unit 61 of the present embodiment performs control to increase the flow rate of the fuel gas at the time of ignition than at the time of normal combustion control in order to prevent ignition failure due to the exhaust gas not being circulated at the time of ignition. Do. Next, fuel gas supply control and exhaust gas circulation control during ignition by the control unit 61 will be described.
  • FIG. 2 is a timing chart schematically showing opening / closing control of the bypass valve 37 and the exhaust gas flow rate adjustment damper 27 before and after ignition.
  • pre-purge control is performed as a stage before ignition.
  • the pre-purge control is control in which air is sent to the boiler casing 11 by the blower 41 and the inside of the boiler casing 11 is ventilated.
  • the bypass valve 37 is controlled to be closed, and the exhaust gas flow rate adjustment damper 27 disposed in the exhaust gas circulation line 19 is also controlled to be closed.
  • the control shifts to ignition control.
  • the control unit 61 performs control to open the flow path of the bypass line 36 by opening the bypass valve 37.
  • the fuel gas flowing through the bypass line 36 is sent to the downstream side of the fuel supply line 31 without being depressurized by the second orifice 35. Therefore, the amount of fuel gas supplied during ignition is higher than when the bypass line 36 is closed and all the fuel gas supplied to the boiler 2 is decompressed by the second orifice 35 (during normal combustion). Becomes larger.
  • the control unit 61 controls the bypass valve 37 to be closed and the exhaust gas flow rate adjustment damper 27 to be opened (see FIG. 2) after a predetermined time (several seconds to several tens of seconds) has elapsed since the start of ignition.
  • a predetermined time severe seconds to several tens of seconds
  • By closing the bypass valve 37 the flow path of the bypass line 36 is closed, and the supply amount of the fuel gas supplied to the boiler 2 becomes smaller than that at the time of ignition. Also.
  • the exhaust gas flow rate adjustment damper 27 By opening the exhaust gas flow rate adjustment damper 27, the flow path of the exhaust gas circulation line 19 is opened, and the exhaust gas generated after ignition is introduced into the blower 41 (air supply unit 4).
  • combustion adjustment is performed based on the state where the flow path of the bypass line 36 is closed and the exhaust gas is introduced into the blower 41 (the state where the exhaust gas having a low oxygen concentration and the outside air are mixed). Therefore, the fuel gas is supplied to the boiler 2 in an appropriate amount when the bypass valve 37 is closed, and the exhaust gas is mixed in the appropriate amount with respect to the combustion air by opening the exhaust gas flow adjustment damper 27. It is supplied to the boiler 2.
  • the boiler 2 that has shifted to the combustion control heats the water in the water pipe 12 by the combustion of a mixture of combustion air mixed with exhaust gas and fuel gas to generate steam.
  • the generated steam is supplied to the load equipment through the steam line 20.
  • the exhaust gas generated by the combustion of the air-fuel mixture is sent to the exhaust cylinder 18.
  • a part of the exhaust gas is sent to the blower 41 through the exhaust gas circulation line 19 and the rest is discharged to the outside.
  • the exhaust gas sent to the blower 41 is mixed with external air and circulated to the boiler 2 through the air supply line 42.
  • the boiler apparatus 1 of the present embodiment includes a bypass line 36 in which an end on one side and an end on the other side are connected on the path of the fuel supply line 31, a bypass valve 37 disposed in the bypass line 36, When the burner 15 is ignited, the bypass valve 37 is closed. When the burner 15 is ignited, the bypass valve 37 is opened and the fuel gas is also circulated through the bypass line 36. And a control unit 61 that performs control. As a result, the amount of fuel gas supplied at the time of ignition is larger than that at the time of normal combustion. Therefore, since the exhaust gas with a low oxygen concentration is not mixed, the oxygen concentration is excessive with respect to the fuel gas. Defects can be reliably prevented.
  • the bypass line 36 has one end connected to the upstream side of the second orifice 35 and the other end connected to the downstream side of the second orifice 35.
  • the control unit 61 closes the exhaust gas flow rate adjustment damper 27 so that the exhaust gas is not supplied to the blower 41 (air supply unit 4), and the exhaust gas is supplied to the blower 41 after a predetermined time has elapsed from the ignition of the burner. Control is performed to open the exhaust gas flow rate adjustment damper 27 so as to be started. As a result, it is possible to reliably prevent the air (residual exhaust gas) inside the exhaust gas circulation line 19 from being supplied to the blower 41 at the start of pre-purge or ignition, and smoothly shift to control for circulating the exhaust gas as the exhaust gas is generated. Can be made.
  • the control for closing the bypass valve 37 and the control for opening the exhaust gas flow rate adjustment damper 27 are performed at the same time, but these controls are performed at different timings with a time difference. It may be.
  • the bypass valve 37 is configured as an electromagnetic valve that is electrically controlled, but may be appropriately changed according to circumstances. For example, a configuration such as a needle valve or a butterfly valve may be added to the bypass valve 37 so that the flow rate of the fuel gas flowing through the bypass line 36 can be adjusted.
  • the exhaust gas flow rate adjusting damper 27 constitutes the exhaust gas flow rate adjusting unit, but this configuration can be changed as appropriate.
  • an electromagnetic valve can be employed in the exhaust gas flow rate adjustment unit.
  • downstream end of the exhaust gas circulation line 19 is connected to the blower 41, but this configuration can be changed as appropriate.
  • the downstream end of the exhaust gas circulation line 19 may be connected to the air supply line 42 and the exhaust gas may be sent to the air supply line 42 by a separately provided fan.
  • the exhaust gas flow rate adjusting portion 27 is configured by the exhaust gas flow rate adjusting damper 27 arranged in the exhaust gas circulation line 19, but the configuration is not limited to this.
  • the exhaust gas flow rate adjustment unit can be configured by a flow rate adjustment damper and an open / close damper.
  • the flow rate adjustment damper is configured to be able to adjust the opening degree, and is a damper that adjusts the mixing ratio of the exhaust gas.
  • the open / close damper is a damper that adjusts whether exhaust gas is supplied to the blower 41.
  • the exhaust gas flow rate adjustment unit can be configured with only the open / close damper. Thus, the configuration of the exhaust gas flow rate adjusting unit can be changed as appropriate.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Control Of Combustion (AREA)

Abstract

La présente invention concerne un dispositif de chaudière 1 doté d'une conduite de dérivation (36) dont une extrémité d'un côté et une extrémité de l'autre côté sont raccordées au trajet d'une conduite d'alimentation en carburant (31), d'une soupape de dérivation (37) agencée dans la conduite de dérivation (36) et d'une unité de commande (61) qui réalise la commande de la fermeture de la soupape de dérivation (37) pendant la combustion normale et de l'ouverture de la soupape de dérivation (37) pour permettre au gaz combustible de s'écouler dans la conduite de dérivation (36), ainsi que pendant l'allumage d'un brûleur (15), rendant ainsi la quantité de gaz combustible fournie supérieure à la quantité pendant la combustion normale. La conduite de dérivation (36) est connectée au niveau de l'extrémité d'un côté au côté amont d'un second orifice (35) et est connectée au niveau de l'extrémité de l'autre côté au côté aval du second orifice (35).
PCT/JP2016/050484 2015-03-31 2016-01-08 Dispositif de chaudière WO2016157925A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020177007385A KR20170134957A (ko) 2015-03-31 2016-01-08 보일러 장치
JP2017509309A JPWO2016157925A1 (ja) 2015-03-31 2016-01-08 ボイラ装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-071633 2015-03-31
JP2015071633 2015-03-31

Publications (1)

Publication Number Publication Date
WO2016157925A1 true WO2016157925A1 (fr) 2016-10-06

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PCT/JP2016/050484 WO2016157925A1 (fr) 2015-03-31 2016-01-08 Dispositif de chaudière

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JP (1) JPWO2016157925A1 (fr)
KR (1) KR20170134957A (fr)
WO (1) WO2016157925A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7380331B2 (ja) 2020-03-02 2023-11-15 三浦工業株式会社 ボイラの燃料ガス供給機構およびボイラ

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102537965B1 (ko) 2021-03-24 2023-06-01 우성씨엔에스(주) 혼합연료가스 예혼합장치

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722811A (en) * 1971-07-13 1973-03-27 Phillips Petroleum Co Method and apparatus for controlling the flow of multiple streams
JPS58145808A (ja) * 1982-02-24 1983-08-31 Babcock Hitachi Kk ボイラ起動時のＮＯｘ低減法
JPS58190618A (ja) * 1982-04-30 1983-11-07 Tokyo Gas Co Ltd 燃焼装置
JPS6172920A (ja) * 1984-09-19 1986-04-15 Tokyo Gas Co Ltd 空燃比制御装置
JPS61106754U (fr) * 1984-12-14 1986-07-07
US4602610A (en) * 1981-01-30 1986-07-29 Mcginnis George P Dual-rate fuel flow control system for space heater
JPH06288511A (ja) * 1993-03-31 1994-10-11 Samuson:Kk 排ガス再循環を行う小型ボイラの空気供給量制御方法
JP2003083509A (ja) * 2001-09-11 2003-03-19 Samson Co Ltd 排ガス再循環燃焼を行うボイラ
JP2013076479A (ja) * 2011-09-29 2013-04-25 Miura Co Ltd ボイラ

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722811A (en) * 1971-07-13 1973-03-27 Phillips Petroleum Co Method and apparatus for controlling the flow of multiple streams
US4602610A (en) * 1981-01-30 1986-07-29 Mcginnis George P Dual-rate fuel flow control system for space heater
JPS58145808A (ja) * 1982-02-24 1983-08-31 Babcock Hitachi Kk ボイラ起動時のＮＯｘ低減法
JPS58190618A (ja) * 1982-04-30 1983-11-07 Tokyo Gas Co Ltd 燃焼装置
JPS6172920A (ja) * 1984-09-19 1986-04-15 Tokyo Gas Co Ltd 空燃比制御装置
JPS61106754U (fr) * 1984-12-14 1986-07-07
JPH06288511A (ja) * 1993-03-31 1994-10-11 Samuson:Kk 排ガス再循環を行う小型ボイラの空気供給量制御方法
JP2003083509A (ja) * 2001-09-11 2003-03-19 Samson Co Ltd 排ガス再循環燃焼を行うボイラ
JP2013076479A (ja) * 2011-09-29 2013-04-25 Miura Co Ltd ボイラ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7380331B2 (ja) 2020-03-02 2023-11-15 三浦工業株式会社 ボイラの燃料ガス供給機構およびボイラ

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KR20170134957A (ko) 2017-12-07
JPWO2016157925A1 (ja) 2018-05-31

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