IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0049695
(2000-08-16)
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우선권정보 |
JP-11/229532(1999-08-16); JP-11/229535(1999-08-16) |
국제출원번호 |
PCT/JP00/005464
(2000-08-16)
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§371/§102 date |
20020923
(20020923)
|
국제공개번호 |
WO01/013042
(2001-02-22)
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발명자
/ 주소 |
- Hasegawa,Toshiaki
- Mochida,Susumu
- Hoshino, legal representative,Kiyoko
- Hoshino, deceased,Toshihumi
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출원인 / 주소 |
- Nippon Furnace Kogyo Kaisha, Ltd.
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대리인 / 주소 |
Dennison, Schultz Dougherty &
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인용정보 |
피인용 횟수 :
71 인용 특허 :
1 |
초록
▼
The present invention provides a fuel feeding apparatus and method for improving the controllability of mixing process and mixing ratio of fuel and combustion air, and a combustion system and method for effecting new combustion properties. The fuel feeding apparatus of the combustion system has fuel
The present invention provides a fuel feeding apparatus and method for improving the controllability of mixing process and mixing ratio of fuel and combustion air, and a combustion system and method for effecting new combustion properties. The fuel feeding apparatus of the combustion system has fuel feeding means, combustion gas extraction means, steam supply means, mixing means and fuel gas introduction means. The combustion gas extraction means extracts combustion gas of a combustion area therefrom. The mixing means mixes the fuel of fuel feeding means with at least one of combustion gas extracted from the furnace and steam of a steam generator. The fuel gas introduction means introduces a mixed fluid of combustion gas, steam and fuel to the combustion area as a fuel gas, and allows the fuel gas to be mixed with the combustion air. A step of mixing the fuel with the combustion gas after extracted from the furnace and a step of mixing the fuel gas with the combustion air are stepwisely carried out, so that the controllability of mixing process and ratio of the air and fuel is improved. Such a control of fuel gas flow enables control of characteristics of flame and production of flame with new properties in the combustion area.
대표청구항
▼
The invention claimed is: 1. An apparatus for feeding fuel which has fuel feeding means for feeding the fuel to a combustion area in a furnace, comprising: mixing means for mixing the fuel of said fuel feeding means with combustion gas extracted from the furnace and/or steam of steam supply means;
The invention claimed is: 1. An apparatus for feeding fuel which has fuel feeding means for feeding the fuel to a combustion area in a furnace, comprising: mixing means for mixing the fuel of said fuel feeding means with combustion gas extracted from the furnace and/or steam of steam supply means; heating means for heating said combustion gas and/or steam up to a high temperature equal to or higher than 700 deg. C.; and fuel gas introduction means for introducing a mixed fluid of said fuel and said combustion gas and/or steam into said combustion area as a fuel gas so as to mix the fuel gas with combustion air supplied to the combustion area by combustion air supply means. 2. An apparatus as defined in claim 1, wherein said mixing means has a mixing area for mixing said fuel with said combustion gas and/or steam, and the fuel and the combustion gas and/or steam are introduced into said mixing area for producing said fuel gas to be introduced into said combustion area. 3. An apparatus as defined in claim 1, comprising forced circulation means for inducing said combustion gas from said combustion area through combustion gas extraction means for extracting the combustion gas of the combustion area therefrom, wherein the forced circulation means adds said steam to said combustion gas and delivers the combustion gas to said mixing device under pressure. 4. An apparatus as defined in claim 1, comprising a plurality of said mixing means and passage change-over means for switching a fluid passage of said combustion gas and/or steam leading to said mixing means, wherein said fuel feeding means is provided with fuel control means for switching a fuel supply passage in synchronism with said change-over means. 5. An apparatus as defined in claim 1, further comprising steam heating means for heating steam of said steam supply means up to a temperature equal to or higher than 700 deg. C. and feeding the heated steam to said mixing means. 6. A combustion system comprising said apparatus as defined in claim 1, and said combustion air supply means for feeding the combustion air to the combustion area. 7. An apparatus as defined in claim 2, further comprising combustion gas cooling means for cooling said combustion gas, wherein said mixing area is positioned between said heating means and said combustion area. 8. An apparatus as defined in claim 2, wherein said fuel gas introduction means has a fuel gas injection port opening to the combustion area, and said mixing area is positioned within the fuel gas injection port to be in communication with said combustion area. 9. A combustion system as defined in claim 6, comprising mixing means for partially feeding said combustion gas and/or steam to said combustion air supply means and mixing the combustion gas and/or steam with the combustion air. 10. A combustion system as defined in claim 6, wherein said combustion air supply means has combustion gas exhaust means for exhausting the combustion gas of said combustion area, and a regenerator which is in heat transfer contact with the combustion gas to take a heat accumulation action and which is in heat transfer contact with the combustion air to take a heat emission action, and wherein said combustion air is pre-heated up to a high-temperature equal to or higher than 800 deg. C. 11. An apparatus as defined in claim 7, wherein said cooling means and heating means are provided with a regenerator which is in heat transfer contact with said combustion gas at a high temperature so as to effect heat accumulation, and which is in heat transfer contact with said cooled combustion gas and/or steam so as to effect heat emission. 12. An apparatus as defined in claim 7, wherein said cooling means and heating means are provided with a regenerator which is in heat transfer contact with said combustion gas at a high temperature so as to effect heat accumulation, and which is in heat transfer contact with the cooled combustion gas and/or said steam so as to effect heat emission. 13. A method for feeding fuel in which the fuel and combustion air is fed to a combustion area, said method comprising: feeding combustion gas extracted from a furnace and/or steam of steam supply means to a mixing area; feeding said fuel to said mixing area to produce a mixed fluid of the fuel and said combustion gas and/or steam; and introducing said mixed fluid into said combustion area as a fuel gas so as to mix the fuel gas with the combustion air, thereby causing a combustion reaction of said fuel gas in said combustion area, wherein said combustion gas and/or steam, or said mixed fluid, is heated up to a high temperature equal to or higher than 700 deg. C. 14. A method as defined in one claim 13, wherein said mixing area of said fuel and said combustion gas and/or steam leads to said combustion area, and said fuel and said combustion gas and/or steam are injected into said mixing area respectively, so that the mixed fluid in the mixing area is introduced into the combustion area as said fuel gas. 15. A method as defined in claim 13, wherein said mixed fluid introduced into said combustion area has a temperature equal to or higher than 700 deg. C. 16. A method as defined in claim 13, wherein said mixed fluid introduced into said combustion area is mixed with said combustion air pre-heated up to a temperature equal to or higher than 800 deg. C. 17. A method as defined in claim 13, wherein said combustion gas has an oxygen density equal to or smaller than 10%. 18. A method as defined in claim 13, wherein a mixing ratio of said combustion gas and/or steam with said fuel is set to be in a range of 1:1˜20:1. 19. A method as defined in claim 13, wherein a mixing ratio of said fuel gas and/or steam with said combustion air is set to be in a range of 1:10˜20:10. 20. A method as defined in claim 13, wherein a velocity of flow of said fuel gas entering said combustion area is set to be in a range between 10 m/s and 150 m/s. 21. A combustion method including said method for feeding fuel as defined in claim 13, wherein said mixed fluid is introduced into said combustion area as the fuel gas, and the fuel gas is mixed with said combustion air to cause a combustion reaction of said fuel gas in said combustion area. 22. A heating apparatus comprising said combustion system as defined in claim 6. 23. A heating method as defined in claim 21, wherein a position in which said fuel gas is introduced into said combustion area and a position in which said combustion air is introduced into said combustion area are changed in a predetermined interval of time. 24. A method for feeding fuel in which the fuel and combustion air is fed to a combustion area, said method comprising: feeding combustion gas extracted from a furnace and/or steam of steam supply means to a mixing area; feeding said fuel to said mixing area to produce a mixed fluid of the fuel and said combustion gas and/or steam; and introducing said mixed fluid into said combustion area as a fuel gas so as to mix the fuel gas with the combustion air, thereby causing a combustion reaction of said fuel gas in said combustion area, wherein said combustion gas extracted from the furnace at a high temperature and/or said steam heated up to a high temperature equal to or higher than 700 deg. C. by steam heating means is introduced into said mixing area to be mixed with said fuel. 25. A method for feeding fuel in which the fuel and combustion air is fed to a combustion area, said method comprising: feeding combustion gas extracted from a furnace and/or steam of steam supply means to a mixing area; feeding said fuel to said mixing area to produce a mixed fluid of the fuel and said combustion gas and/or steam; and introducing said mixed fluid into said combustion area as a fuel gas so as to mix the fuel gas with the combustion air, thereby causing a combustion reaction of said fuel gas in said combustion area, wherein the fuel is mixed with said combustion gas and/or steam after the combustion gas and/or steam is heated up to a high temperature equal to or higher than 700 deg. C. 26. A method for feeding fuel in which the fuel and combustion air is fed to a combustion area, said method comprising: feeding combustion gas extracted from a furnace and/or steam of steam supply means to a mixing area; feeding said fuel to said mixing area to produce a mixed fluid of the fuel and said combustion gas and/or steam; and introducing said mixed fluid into said combustion area as a fuel gas so as to mix the fuel gas with the combustion air, thereby causing a combustion reaction of said fuel gas in said combustion area, wherein a part of said combustion gas and/or steam is mixed with said combustion air to reduce an oxygen density of the combustion air, and then, said fuel gas is mixed with the combustion air. 27. A method for feeding fuel in which the fuel and combustion air is fed to a combustion area, said method comprising: feeding combustion gas extracted from a furnace and/or steam of steam supply means to a mixing area; feeding said fuel to said mixing area to produce a mixed fluid of the fuel and said combustion gas and/or steam; and introducing said mixed fluid into said combustion area as a fuel gas so as to mix the fuel gas with the combustion air, thereby causing a combustion reaction of said fuel gas in said combustion area, wherein said steam is added to said combustion gas to adjust a quantity of steam contained in the combustion gas. 28. A method for feeding fuel in which the fuel and combustion air is fed to a combustion area, said method comprising: feeding combustion gas extracted from a furnace and/or steam of steam supply means to a mixing area; feeding said fuel to said mixing area to produce a mixed fluid of the fuel and said combustion gas and/or steam; and introducing said mixed fluid into said combustion area as a fuel gas so as to mix the fuel gas with the combustion air, thereby causing a combustion reaction of said fuel gas in said combustion area, wherein said combustion gas, and/or said steam or said mixed fluid, gains sensible heat which the combustion gas loses upon cooling thereof, whereby said combustion gas and/or said steam, or said mixed fluid, is reheated or heated up to a high temperature equal to or higher than 700 deg. C. 29. An apparatus for feeding fuel which has fuel feeding means for feeding the fuel to a combustion area in a furnace, comprising: mixing means for mixing the fuel of said fuel feeding means with steam of steam supply means; steam heating means for heating said steam up to a temperature equal to or higher than 700 deg. C. and feeding the heated steam to said mixing means; and fuel gas introduction means for introducing a mixed fluid of said fuel and said steam into said combustion area as a fuel gas so as to mix the fuel gas with combustion air supplied to the combustion area by combustion air supply means. 30. An apparatus as defined in claim 29, wherein combustion gas extracted from a furnace is further mixed with the fuel of said fuel feeding means by said mixing means, said fuel gas introduction means introduces said mixed fluid of said fuel, said combustion gas and said steam into said combustion area as a fuel gas so as to mix the fuel gas with said combustion air. 31. A combustion system comprising said apparatus as defined in claim 29, and said combustion air supply means for feeding the combustion air to the combustion area.
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