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公开(公告)号：CA2176488A1
公开(公告)日：1996-03-28
申请号：CA2176488
申请日：1995-09-22
Applicant: NIPPON KOKAN KK , NIPPON FURNACE KOGYO KK
Inventor： FUJII YOSHIKI , ISHII TOSHIO , SUGIYAMA SHUNICHI , KURIOKA SHIGEO , SATO HIROAKI , HOKABORI AKINORI , AKIYAMA TOSHIKAZU , TANAKA RYOICHI , MATSUO MAMORU , MIYATA MAKOTO
Abstract: This invention relates to a radiant tube burner used for heating a heating furance, and aims at minimizing the occurrence of NOx during combustion and forming the radiant tube burner to a structure suitable therefor. This invention aims at simplifying the controlling of a fuel supply system and an air supply system, and preventing the necessity of a coking operation. This invention also aims at providing a combustion control method suitable for a radiant tube burner. To achieve these objects, the free ends of fuel nozzles in the present invention, for example, nozzles (11) serving also as pilot nozzles and air throats (13) are disposed in the end portions of a radiant tube (3), and combustion air ejection ports (33) of the air throats (13) are provided eccentrically so as to contact or get close to an inner circumferential wall surface of the radiant tube (3). A controller (307) for subjecting the burner to alternating combustion is also provided.
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公开(公告)号：EP0772001A4
公开(公告)日：1998-11-25
申请号：EP95925136
申请日：1995-07-17
Applicant: TOYOTA MOTOR CO LTD , NIPPON FURNACE KOGYO KK
Inventor： NISHIYAMA TOMOHIKO , MITANI KAZUHISA , TANAKA RYOICHI , MATSUO MAMORU
CPC classification number: F23M5/025 , F23C6/042 , F23C9/006 , F23L15/02 , Y02E20/348
Abstract: In the combustion using air pre-heated by accumulation type direct heat exchange between an exhaust gas and combustion air by using an accumulator as a heat-exchange medium, the present invention provides a low NOx burner which is effective for reducing NOx not only in a high temperature zone but also in a medium temperature zone, in which the NOx reduction has been difficult conventionally, and has high flame stability. In this low NOx burner, a burner tile (22) having a burner tile expanded diameter portion (23) having a diameter greater than that of an outlet of an air throat (2) for passing the full amount of combustion air is disposed at this outlet, and a fuel nozzle (19) injecting a fuel from this burner tile expanded diameter portion (23) is provided. The flow of combustion air jetted from the air throat (24) generates a negative pressure at the portion of a sub-combustion chamber (25) encompassed by the burner tile expanded diameter portion (23), so that strong re-circulation of the exhaust gas occurs inside a furnace, and a flame stabilizing region (X1), a furnace exhaust gas re-circulation/combustion region (X2) and a gentle combustion region (X3) are formed.
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公开(公告)号：EP0870987A4
公开(公告)日：1999-08-25
申请号：EP96943344
申请日：1996-12-27
Applicant: NIPPON FURNACE KOGYO KK
Inventor： TANAKA RYOICHI , MATSUO MAMORU
CPC classification number: F23L15/02 , F23G7/068 , F26B23/022 , Y02E20/348 , Y02P70/40
Abstract: A deodorizing furnace directed to making an equipment compact and considerably enhancing a thermal efficiency of the furnace as compared with the prior art. An out-of-furnace circulation circuit (4) connects a deodorizing furance (1) to a thermal equipment (8), which makes use of intermediate and low temperature air currents as a heat source, so as to circulate a combustion exhaust gas in an interior (2) of the deodorizing furnace, which has been used for incineration or thermal decomposition of odor components. When the combustion exhaust gas passes through heat accumulating bodies (5A or 5B) on a suction side of the out-of-furnace circulation circuit, a part of its sensible heat is recovered by the heat accumulating bodies (5A or 5B) and is fed to the thermal equipment (8) as intermediate- and low-temperature air currents which are usable in the thermal equipment (8). After completing a predetermined work in the equipment (8), the air currents make use of recovered heat at the heat accumulating bodies (5A or 5B) on a discharge side of the out-of-furnace circulation circuit to be made high in temperature to be returned to the interior (2) of the deodorizing furnace. Accordingly, a part of heat generated in the interior (2) of the deodorizing furnace and not fully recovered by the heat accumulating bodies (5A or 5B) and discarded, is used as a heat source of the thermal equipment (8), and it is possible to make the equipment compact and low in cost without the need of any additional air-heating furnace for the thermal equipment (8).
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公开(公告)号：CA2241741A1
公开(公告)日：1997-07-10
申请号：CA2241741
申请日：1996-12-27
Applicant: NIPPON FURNACE KOGYO KK
Inventor： MATSUO MAMORU , TANAKA RYOICHI
Abstract: A deodorizing furnace directed to making an equipment compact and considerably enhancing a thermal efficiency of the furnace as compared with the prior art. An out-of-furnace circulation circuit (4) connects a deodorizing furance (1) to a thermal equipment (8), which makes use of intermediate and low temperature air currents as a heat source, so as to circulate a combustion exhaust gas in an interior (2) of the deodorizing furnace, which has been used for incineration or thermal decomposition of odor components. When the combustion exhaust gas passes through heat accumulating bodies (5A or 5B) on a suction side of the out-of-furnace circulation circuit, a part of its sensible heat is recovered by the heat accumulating bodies (5A or 5B) and is fed to the thermal equipment (8) as intermediate- and low-temperature air currents which are usable in the thermal equipment (8). After completing a predetermined work in the equipment (8), the air currents make use of recovered heat at the heat accumulating bodies (5A or 5B) on a discharge side of the out-of-furnace circulation circuit to be made high in temperature to be returned to the interior (2) of the deodorizing furnace. Accordingly, a part of heat generated in the interior (2) of the deodorizing furnace and not fully recovered by the heat accumulating bodies (5A or 5B) and discarded, is used as a heat source of the thermal equipment (8), and it is possible to make the equipment compact and low in cost without the need of any additional air-heating furnace for the thermal equipment (8).
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公开(公告)号：CA2241740A1
公开(公告)日：1997-07-10
申请号：CA2241740
申请日：1996-12-27
Applicant: NIPPON FURNACE KOGYO KK
Inventor： MATSUO MAMORU
Abstract: The present invention relates to a gas flow circulation type tubular heating equipment, of which a heat transfer performance is improved and a heat transfer area is made at most about half that of a conventional one, and which is not limited in fuels used. The equipment comprises a furnace (1) having a multiplicity of tubes (19,---, 19), heating chambers (2, 2) provided with heat sources (3A, 3B) for heating a circulating gas outside the furnace, and an outof-furnace circulating path (4) for taking a part of the circulating gas passing through an interior (18) of the furnace out of the furnace and again returning the same from another location to the interior (18) of the furnace. The out-of-furnace circulating path (4) comprises heat accumulating bodies (5A, 5B), respectively, provided at inlet and outlet portions (9A, 9B) for the heating chamber (2), a circulating fan (6), a flow passage switching device (7) for switching directions of gas flow to the heat accumulating bodies (5A, 5B) by selectively and alternately connecting suction and discharge sides of the circulating fan (6) with either of the heat accumulating bodies (5A, 5B), and heat extraction means (8) for performing extraction or reduction of heat in the heat accumulating bodies (5A, 5B). Thus high temperature, strong circulating flows (10), which are periodically reversed in a flow direction by the flow passage switching device (7), are formed in the interior (18) of the furnace.
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Patent Agency Ranking
公开(公告)号：CA2177352A1
公开(公告)日：1995-06-08
申请号：CA2177352
申请日：1994-12-01
Applicant: NIPPON FURNACE KOGYO KK
Inventor： TANAKA RYOICHI , MATSUO MAMORU , YASUDA TSUTOMU
Abstract: The present invention provides a regenerative heat exchange system which performs heat exchange by alternately passing combustion exhaust gas as high-temperature fluid and combustion air as low-temperature fluid through a fixed regenerator, and a regenerative burner which carries out combustion using preheated air having a high temperature which is obtained by the regenerative heat exchange system. The regenerative heat exchange system comprises: a permeable regenerator 1 partitioned into three or more chambers in the circumferential direction; double-pipe outlet/inlet means 6 partitioned into a supply chamber 6a and an exhaust chamber 6b; and changeover means 3 which isolates the regenerator 1 from the outlet/inlet means 6, and by which the regenerator 1 selectively communicates with the outlet/inlet means 6 by a supply communicating hole 5 and an exhaust communicating hole 4 which are provided with such a positional relation that the supply communicating hole 5 and the exhaust communicating hole 4 do not simultaneously exist in any of partitioned chambers 9, 10 and 11 of the regenerator 1 and a vacant chamber 10 through which the fluid does not flow is formed to at least one position between the chamber through which the exhaust gas flows and the chamber 12 through which the air flows. Further, the regenerative burner is constituted by providing to the regenerative heat exchange system a fuel nozzle 31 piercing through the center thereof so that fuel is continuously injected while the high-temperature combustion air is injected from the regenerator around the fuel. Also, a heat exchange system in which a flowing direction of fluid does not change can be realized by providing outlet/inlet means 6 and changeover means in front of and at the rear of the regenerator 1 without using the fuel nozzle 31.
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公开(公告)号：DE69524726D1
公开(公告)日：2002-01-31
申请号：DE69524726
申请日：1995-09-22
Applicant: NIPPON FURNACE KOGYO KK , NIPPON KOKAN KK
Inventor： FUJII YOSHIKI , ISHII TOSHIO , SUGIYAMA SHUNICHI , TANAKA RYOICHI , MATSUO MAMORU , MIYATA MAKOTO , KURIOKA SHIGEO , SATO HIROAKI , HOKABORI AKINORI , AKIYAMA TOSHIKAZU
Abstract: This invention relates to a radiant tube burner used for heating a heating furance, and aims at minimizing the occurrence of NOx during combustion and forming the radiant tube burner to a structure suitable therefor. This invention aims at simplifying the controlling of a fuel supply system and an air supply system, and preventing the necessity of a coking operation. This invention also aims at providing a combustion control method suitable for a radiant tube burner. To achieve these objects, the free ends of fuel nozzles in the present invention, for example, nozzles (11) serving also as pilot nozzles and air throats (13) are disposed in the end portions of a radiant tube (3), and combustion air ejection ports (33) of the air throats (13) are provided eccentrically so as to contact or get close to an inner circumferential wall surface of the radiant tube (3). A controller (307) for subjecting the burner to alternating combustion is also provided.
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公开(公告)号：DE69414884D1
公开(公告)日：1999-01-14
申请号：DE69414884
申请日：1994-01-18
Applicant: NIPPON FURNACE KOGYO KK
Inventor： TANAKA RYOICHI , MATSUO MAMORU
Abstract: A high-cycle regenerative combustion system (1) has first and second regenerative heat exchanger units (11,12). A four-way valve (3) is provided for alternately bringing the heat exchanger units (11,12) into contact with a low temperature fluid and a high temperature fluid. The valve (3) is switched at a switching cycle time not longer than 60 seconds. Each heat exchanger unit (11,12) has a void ratio epsilon which substantially provides the maximum value (Q/V)max of the volumetric efficiency (Q/V). The temperature efficiency eta t is preset to be a value in a range between 0.7 and 1.0. The heat transmission coefficient h and the heat transmission area A of the heat exchanger unit (11,12) are determined such that the temperature efficiency, which is calculated in accordance with a specific equation as being a function of the heat transmission coefficient, the heat transmission area and the switching cycle time tau , falls under the preset value within the range mentioned above. Each of the first and second heat exchanger units (11,12) has the cell pitch P and the cell wall thickness b, which provide the above-mentioned values of the void ratio, heat transmission coefficient and heat transmission area. Thus, a compact and high-performance regenerative heat exchanger can be obtained, which has a reduced overall volume while exhibiting the large heat transmission rate and high temperature efficiency.
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公开(公告)号：CA2183966C
公开(公告)日：1999-01-05
申请号：CA2183966
申请日：1995-03-09
Applicant: NIPPON FURNACE KOGYO KK
Inventor： TANAKA RYOICHI , MIYATA MAKOTO , MATSUO MAMORU
IPC: F16K11/072 , F16K11/052 , F16K11/02
Abstract: The present invention relates to a four-port valve capable of controlling directions of the flow of two types of fluid, e.g., the two types of fluid having different temperatures in passages at a high speed with a simple structure without causing leakage of the fluid. This four-port valve is configured in such a manner as that: the inside of a casing 1 is divided into four chambers 3a, 3b, 3c and 3d by a substantially-X-shaped partition wall 2; two opposed chambers 3d and 3c among the four chambers are determined as fixing chambers communicating with ports respectively connected with two types of passages in which directions of the flow of fluid are fixed while the remaining two opposed chambers 3a and 3b are determined as change-over chambers communicating with ports respectively connected with two types of passages in which directions of the flow of fluid are alternately changed over; valve openings 5ac, 5ad, 5bd and 5bc for communicating two chambers adjacent to the substantially-X-shaped partition wall 2 with each other are provided; a valve plate 6 for closing the valve openings and a drive shaft 8 for supporting and oscillating the valve plate 6 are provided in one chamber, e.g., the chamber 3d among the four chambers 3a, 3b, 3c and 3d while a valve plate 6' for closing the valve openings is provided to the opposed chamber 3c so that valve plate 6' is connected with the valve plate 6 supported by the drive shaft 8 by a semi-circular or circular connecting ring 7 piercing through the valve openings 5ac, 5ad, 5bd and 5bc; and the valve plate 6 oscillating by rotation of the drive shaft 8 is interlocked with the other valve plate 6' to alternately communicate the two fixing chamber 3d and 3c with the different change-over chambers 3a and 3b, thereby flowing only one type of fluid around the drive shaft 8.
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公开(公告)号：CA2122482A1
公开(公告)日：1993-05-13
申请号：CA2122482
申请日：1992-10-30
Inventor： MIYAMA HIROSHI , OHKI TETSUHIKO , KAJI HITOSHI , SHIMIZU RYOSUKE , TANAKA RYOICHI , MATSUO MAMORU , KAWAMOTO MASAO , KIKUKAWA HIROKUNI
Abstract: A tubular furnace of such an arrangement that, while a fluid to be heated can be prevented from coking or a heating pipe can be prevented from burning, a predetermined quantity of heat is provided through a smaller heat transfer area and problems of corrosion at low temperature of the heating pipe in the tubular furnace due to sulfur contents in the fuel are solved, to thereby achieve a high efficiency. In this tubular furnace (1), a coil path (3) is divided into a plurality of zones (2, ..., 2); at least one heat accumulator type burner system (4) is provided in each of the zones (2, ..., 2) for alternately performing the supply of combustion air to burners (5, 6) through heat accumulators (7, 7) and the discharge of combustion gas therefrom; a combustion quantity is independently controlled in each of the zones (2, ..., 2), so that a desirable heat flux pattern can be formed such that a boundary layer temperature of the fluid to be heated in the zones (2, ..., 2) of the coil path (3) is lower than a coking temperature or lower than an allowable maximum temperature to be determined by the material for use in the heating pipe, and is set substantially the same in all of the zones. With this arrangement, the heat flux is increased at the inlet zone where the temperature is well below a coking temperature, while coking is prevented; a predetermined quantity of heat is provided through a smaller heat transfer area; the temperature of the tubular wall at the inlet zone is raised to avoid the corrosion at low temperature; the waste heat of the waste combustion gas is utilized to preheat the combustion air so as to achieve a thermal efficiency as high as that in a furnace provided with a convection section, even without a convection section, so that it becomes possible to render the furnace compact in size or to increase the treating quantity.
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