US20130340658A1 - Exhaust gas recycling control system of combustion device - Google Patents

Exhaust gas recycling control system of combustion device Download PDF

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Publication number
US20130340658A1
US20130340658A1 US13/571,721 US201213571721A US2013340658A1 US 20130340658 A1 US20130340658 A1 US 20130340658A1 US 201213571721 A US201213571721 A US 201213571721A US 2013340658 A1 US2013340658 A1 US 2013340658A1
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US
United States
Prior art keywords
exhaust gas
combustion device
oxygen content
recycling
control
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
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US13/571,721
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English (en)
Inventor
Chiu-Huei LIAO
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.)
SHENG ZHUN ENTERPRISE CO Ltd
Original Assignee
SHENG ZHUN ENTERPRISE CO Ltd
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Filing date
Publication date
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Assigned to SHENG ZHUN ENTERPRISE CO., LTD. reassignment SHENG ZHUN ENTERPRISE CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Liao, Chiu-Huei
Publication of US20130340658A1 publication Critical patent/US20130340658A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0052—Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
    • F23B80/02—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel by means for returning flue gases to the combustion chamber or to the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B90/00—Combustion methods not related to a particular type of apparatus
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J11/00—Devices for conducting smoke or fumes, e.g. flues 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F02D2021/083—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine controlling exhaust gas recirculation electronically
    • 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 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/30—Premixing fluegas with combustion air
    • 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 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/50—Control of recirculation rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00—Special features of, or arrangements for incinerators
    • F23G2900/00001—Exhaust gas recirculation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2221/00—Pretreatment or prehandling
    • F23N2221/12—Recycling exhaust gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to an exhaust gas recycling control system of combustion device, and more particularly to an oxygen content of exhaust gas as a control of the opening or closing the backflow path.
  • a boiler as an example has the following drawbacks:
  • the emission temperature of a boiler is between 150° C. and 208° C.
  • Such a high temperature of exhaust gas emitted to the atmosphere not only causes air pollution but accelerates the global warming effect, which is extremely serious environmental problem.
  • the continuous emission of the exhaust gas of 150° C. to 280° C. causes continuous loss of the temperature of a combustion chamber; such that, the fuel and cold air must be continually add into the device, resulting in increasing costs.
  • FIG. 1 shows the relationship between the combustion efficiency of the conventional combustion device and the oxygen content of the exhaust gas, and the emission temperature respectively is 150° C., 175° C., 200° C., and 230° C.
  • FIG. 1 shows that the higher is the oxygen content O 2 %, the lower is the combustion efficiency, resulting in a part of the heat energy of the fuel is taken away by the excess air.
  • every 3% of the oxygen content in the exhaust gas is decreased; about 1% to 2% of the fuel is saved.
  • the air-fuel ratio control system is used in industry; that is, the early mechanical air-fuel ratio device is replaced by the microcomputer air-fuel ratio control system.
  • the microcomputer air-fuel ratio control system comprises combustion device program control, air blower speed control, etc., and provides a curve way operation to solve the combustion problems of the mechanical air-fuel ratio device.
  • the oxygen content emission of the exhaust gas is still high, and the high-temperature exhaust gas (150° C. to 280° C.) cannot be recycled, which is a kind of waste. Therefore, there is room for improvement.
  • the invention includes: a combustion device having an inlet end and an exhaust end; an air conditioning unit arranged before the inlet end to adjust the supply of cold air; characterized in that: the exhaust end is connected with a recycling tube to the inlet end, and the recycling tube includes a control valve thereon to control the recycling tube being in an opened or closed state; an oxygen sensor mounted on the exhaust end or the recycling tube to detect an oxygen content in an exhaust gas and convert an oxygen content detected signal into a voltage signal being sent to a controller; and the controller has a computer processing capability to receive the signal of the oxygen sensor as a control of the control valve being in the opened or closed state; when the oxygen content in the exhaust gas is higher than a set value of the controller, the control valve opens and a high oxygen content of exhaust gas flows through the recycling tube to the inlet end to be reuse.
  • the combustion device may include a boiler, an incinerator, and a power generation device
  • the control valve may include a gate valve, a magnetic valve, and a butterfly valve, wherein the butterfly valve is driven by a servomotor for the controller to control an operation of the servomotor, in order to control the butterfly valve being in the opened or closed state.
  • the recycling tube further includes a blower controlled by the controller, being turned on or off.
  • the present invention provides the recycling tube and the oxygen sensor to detect the oxygen content in an exhaust gas and send the high oxygen content to the inlet end, and thus to greatly reduce the inner temperature within the combustion device and to reduce the injection of the external cold air. Therefore, the present invention achieves energy saving and carbon emission reduction effects and avoid air pollution and global warming.
  • FIG. 1 is relationship diagram, illustrating the relationship between the combustion efficiency of the conventional combustion device and the oxygen content of the exhaust gas
  • FIG. 2 is a schematic view of the preferred embodiment in accordance with the present invention.
  • FIG. 3 is a flow process view of the exhaust gas recycling control of the present invention.
  • FIG. 4 is schematic view, illustrating a preferred region of the set value of the oxygen content in accordance with the present invention
  • a combustion device 10 includes a boiler, an incinerator, and a power generation device . . . etc., which has a combustion chamber and an exhaust device.
  • the combustion device 10 has an inlet end 11 at a front side thereof and an exhaust end 12 at a reserve side thereof to discharge an exhaust gas of the combustion device 10 .
  • an air conditioning unit 20 is arranged in front of the inlet end 11 .
  • the air conditioning unit 20 may be a blower of a burner (not shown) to provide cold air containing about 21% of the oxygen for the combustion device 10 .
  • the air conditioning unit 20 may be a blower of a burner (not shown) to provide cold air containing about 21% of the oxygen for the combustion device 10 .
  • the present invention is characterized in that the exhaust end 12 is connected with a recycling tube 30 to the inlet end 11 , and the recycling tube 30 includes at least a control valve 40 thereon to control the recycling tube 30 being in an opened or closed state.
  • the control valve 40 is a butterfly valve driven by a servomotor 41 , but it is not a limitation; that is, the control valve 40 may be a gate valve or a magnetic valve.
  • An oxygen sensor 50 is mounted on the exhaust end 12 or the recycling tube 30 to detect the oxygen content O 2 % in the exhaust gas and convert an oxygen content detected signal into a voltage signal being sent to a controller 60 .
  • the controller 60 has a computer processing capability to receive the signal of the oxygen sensor 50 as a control of the control valve 40 being in the opened or closed state.
  • the control valve 40 opens and high oxygen content 14 of exhaust gas flows through the recycling tube 30 to the inlet end 11 to be reused.
  • the controller 60 controls an operation of the servomotor 41 to control the butterfly valve which is the control valve 40 , being in the opened or closed state.
  • the opening of butterfly valve 40 simultaneously changes with the oxygen content of the exhaust gas; that is, when the oxygen content O 2 % in the exhaust gas is high, the controller 60 controls the servomotor 41 to increase the opening of the butterfly valve 40 for increasing the exhaust gas recycling flow.
  • the butterfly valve 40 is closed so that low oxygen content 13 of exhaust gas is discharged through the exhaust end 12 .
  • the recycling tube 30 further includes a blower 31 controlled by the controller 60 , being turned on or off; that is, when the oxygen content O 2 % in the exhaust gas is high, the controller 60 controls the blower 31 to be turned on.
  • the blower 31 may be driven by a variable-frequency motor (not shown) to speed up the rotation speed of the blower 31 .
  • the controller 60 slows down or turns off the blower 31 .
  • the blower 31 in this embodiment can be set in accordance with the type of the combustion device 10 ; that is, the blower 31 is not required for some of the combustion devices which could easily guide the exhaust gas through the recycling tube 30 to the inlet end 11 .
  • the controller 60 further includes a setting input interface 61 and a display unit 62 .
  • the setting input interface 61 is input a set value of an oxygen content O 2 % into the controller 60 in accordance with the type of the combustion device 10 . For example, when setting the set value of the oxygen content as shown in FIG. 4 higher than 8% or 6%, even higher than 2%, the exhaust gas recycling control system is actuated, and the high oxygen content 14 of exhaust gas of the exhaust end 12 flows through the recycling tube 30 to the inlet end 11 for reusing.
  • controller 60 not only controls the opening and closing of the control valve 40 but also adjusts the inlet-air flow of the air conditioning unit 20 according to the oxygen content detected by the oxygen sensor 50 for the air-fuel ratio within the combustion device 10 to achieve the optimization state, and thus to reduce nitrogen oxides and to enhance the combustion efficiency.
  • FIG. 4 is an example of a boiler, showing that the combustion efficiency is inversely proportional to the oxygen content O 2 %.
  • the combustion efficiency is between 75% and 80% in accordance with the different emission temperature; when the oxygen content in the exhaust gas lowers to 4% to 8%, the combustion efficiency is between 85% and 90%. Therefore, if the oxygen content in the exhaust gas declines from 15% to 6%, the oxygen content value declines 9%, this can save about 3% to 6% of the fuel.
  • the present invention with above-disclosed technical features has the following flow process of the oxygen content in the control of the exhaust gas recycling flow:
  • the flow processes S 1 to S 2 show that the oxygen sensor 50 detects the oxygen content of the exhaust gas in the exhaust end 12 .
  • the flow processes S 3 to S 4 show that the oxygen content detected signal is sent to the controller 60 .
  • the flow process S 5 show that the controller 60 judges whether the oxygen content O 2 % of the exhaust gas is higher than the set value of the controller 60 .
  • the flow processes S 6 to S 9 show that when the oxygen content O 2 % in the exhaust gas is higher than the set value of the controller 60 , the recycling tube 30 is opened for the high oxygen content 14 of the exhaust gas flowing to the inlet end 11 to be reuse by the combustion device 10 .
  • the flow processes S 10 to S 11 show that the oxygen content O 2 % in the exhaust gas is lower than the set value of the controller 60 ; the recycling tube 30 is closed for the low oxygen content 13 of the exhaust gas being discharged through the exhaust end 12 .
  • the present invention provides a combustion device 10 with the exhaust content and the recycling tube 30 for the high oxygen content 14 guided to the inlet end 11 ; such that, the inner temperature of the combustion device 10 will not drop too fast, and the air conditioning unit 20 without the injection of the external cold air has energy-saving effect.
  • most of the exhaust gas is recycled for avoiding air pollution and slowing down the global warming.
  • the present invention different from a traditional exhaust gas control method provides the oxygen sensor 50 to detect the oxygen content in the exhaust gas and the controller 60 to control exhaust gas recycling flow in the recycling tube 30 according to the oxygen content in the exhaust gas, which achieves energy-saving and carbon emission reduction effects and enhances the efficacy of a boiler.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Combustion Of Fluid Fuel (AREA)
US13/571,721 2012-06-22 2012-08-10 Exhaust gas recycling control system of combustion device Abandoned US20130340658A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW101122334 2012-06-22
TW101122334A TWI542406B (zh) 2012-06-22 2012-06-22 Control system for re - use of exhaust gas from combustion plant

Publications (1)

Publication Number Publication Date
US20130340658A1 true US20130340658A1 (en) 2013-12-26

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US13/571,721 Abandoned US20130340658A1 (en) 2012-06-22 2012-08-10 Exhaust gas recycling control system of combustion device

Country Status (6)

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US (1) US20130340658A1 (de)
EP (1) EP2677148A2 (de)
JP (1) JP2014005822A (de)
KR (1) KR20140000125A (de)
CN (1) CN103513665A (de)
TW (1) TWI542406B (de)

Cited By (4)

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CN106122998A (zh) * 2016-06-28 2016-11-16 无锡锡能锅炉有限公司 一种具有余热回收的燃气锅炉
US20180299122A1 (en) * 2015-10-19 2018-10-18 Bertelli & Partners S.R.L. Method for reducing harmful gas emissions from a gas-fired sealed combustion chamber forced-draught boiler and boiler so obtained
CN110762515A (zh) * 2019-11-28 2020-02-07 中国华能集团清洁能源技术研究院有限公司 一种能够调节烟气氧量的锅炉烟气再循环系统及方法
CN111550770A (zh) * 2020-04-21 2020-08-18 中国神华能源股份有限公司国华电力分公司 一种富氧燃烧锅炉系统及其运行方法

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CN106799120A (zh) * 2017-03-08 2017-06-06 广东益康生环保设备有限公司 一种有机物降解机的废气减量化处理工艺
CN108803753B (zh) * 2018-07-26 2021-03-02 合肥云联电子科技有限公司 一种工控设备内部环境的智能化调控系统
CN111853799A (zh) * 2019-04-28 2020-10-30 台湾艾斯科股份有限公司 减容装置及其减容衍生气体回收利用处理方法

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
US20180299122A1 (en) * 2015-10-19 2018-10-18 Bertelli & Partners S.R.L. Method for reducing harmful gas emissions from a gas-fired sealed combustion chamber forced-draught boiler and boiler so obtained
US10851991B2 (en) * 2015-10-19 2020-12-01 Bertelli & Partners S.R.L. Method for reducing harmful gas emissions from a gas-fired sealed combustion chamber forced-draught boiler and boiler so obtained
CN106122998A (zh) * 2016-06-28 2016-11-16 无锡锡能锅炉有限公司 一种具有余热回收的燃气锅炉
CN110762515A (zh) * 2019-11-28 2020-02-07 中国华能集团清洁能源技术研究院有限公司 一种能够调节烟气氧量的锅炉烟气再循环系统及方法
CN111550770A (zh) * 2020-04-21 2020-08-18 中国神华能源股份有限公司国华电力分公司 一种富氧燃烧锅炉系统及其运行方法

Also Published As

Publication number Publication date
TW201400175A (zh) 2014-01-01
JP2014005822A (ja) 2014-01-16
EP2677148A2 (de) 2013-12-25
KR20140000125A (ko) 2014-01-02
CN103513665A (zh) 2014-01-15
TWI542406B (zh) 2016-07-21

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