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61. 发明专利

JPH07167437A GAS TURBINE AND COMBUSTION DEVICE IN GAS TURBINE 失效
公开(公告)号：JPH07167437A
公开(公告)日：1995-07-04
申请号：JP31468593
申请日：1993-12-15
申请人： HITACHI LTD
发明人： MATSUDA KENSHO , ICHIKAWA KUNIHIRO , AZUHATA SHIGERU , IIZUKA NOBUYUKI , MORITOMO YOSHIKAZU , NAKAYAMA YOSHIHARU , KOBAYASHI SHIGEYOSHI
IPC分类号： F23R3/18 , F23R3/30 , F23R3/34
摘要： PURPOSE:To eliminate a damage of a flame holding device by a method wherein rod-like members are freely inserted into a plurality of through-pass holes arranged at a cylindrical part of a flame holding device and at the same time the rod-like members are fixed to positions near the mixed gas discharging end of a mixing device. CONSTITUTION:Vertical plates 31a of L-shaped fixing flat plates 31. are passed through a plurality of fixing holes 39 arranged at a cylindrical part of a flame holding device 13. Lower ends of the L-shaped fixing flat plates 31 are fitted to inner circumferential holes 38 of pre-mixing gas cylinder installed in advance at an inner wall 34 of the pre-mixing gas cylinder In turn, an upper end of each of the L-shaped fixing flat plates 31 is fitted into an outer circumferential hole 37 of the pre-mixing gas cylinder arranged at the outer circumference 35 of the pre-mixing gas cylinder. The fixing holes 39 of the flame holding device 13 and the vertical plates of the L-shaped fixing flat plates 31 are freely fitted from each other. With such an arrangement as above, even if the flame holding device 13 is formed to be wide at its end, the inner cylinder part of the flame holding device 13 is sufficiently held without being restricted, no stress is generated at the cylinder part, resulting in that the flame holding device 13 is prevented from being damaged.

62. 发明专利

JP2003193866A GAS TURBINE COMBUSTOR 审中-公开
公开(公告)号：JP2003193866A
公开(公告)日：2003-07-09
申请号：JP2001391064
申请日：2001-12-25
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： ARIKAWA HIDEYUKI , ICHIKAWA KUNIHIRO , SUGITA YUJI , SHINOHARA NOBUO , MATSUOKA HIDEYUKI
IPC分类号： F02C7/28 , C22C19/07 , C23C16/40 , F23R3/42
摘要： PROBLEM TO BE SOLVED: To provide a gas turbine combustor having a wear resistant structure to prevent wear and damage occurring in a fitting part of a frame part of a combustor transition piece and a seal material during gas turbine operation. SOLUTION: In this gas turbine combustor, the fitting part of the transition piece is constituted by forming an alumina film having a film of carbide or nitride as a substrate on a surface of the seal material using a cobalt-based alloy containing 0.2 wt.% or less carbon as the seal material and having a thickness of 0.5 to 6 μm and attaching a plate member (protection plate) made of the cobalt-based alloy containing 15 to 35 wt.% chromium and 0.7 to 1.5 wt.% carbon to a contact part of the seal materials 3, 4 in the frame part 2 of the transition piece 1 on a mate side. COPYRIGHT: (C)2003,JPO

63. 发明专利

JP2000328963A GAS TURBINE SYSTEM 失效
公开(公告)号：JP2000328963A
公开(公告)日：2000-11-28
申请号：JP13821499
申请日：1999-05-19
申请人： HITACHI LTD
发明人： ICHIKAWA KUNIHIRO , HIROSE FUMIYUKI , SATO ISAO , OCHIAI KENJI
IPC分类号： F02C7/18 , F02C7/00
摘要： PROBLEM TO BE SOLVED: To enable a temperature detector located downstream airfoils of exhaust gas diffusers to reliably detect only combustor abnormality even when cracks are generated in the airfoils and cooling air leaks therefrom. SOLUTION: This gas turbine system comprises exhaust gas diffusers 2, 3 constructed in a duplex tubular form in a flue gas duct for discharging exhaust gas from the gas turbine and hollow airfoils 6 connecting the outer and inner peripheral walls of the exhaust gas diffusers. Further, cooling air for cooling the gas turbine passes through hollow portions of the airfoils 6. In this case, air diffusion means for diffusing cooling air leaked from the airfoils 6 are provided at rear edge portions of the airfoils 6. The air diffusion means is for example ark-like shielding plate 14 that curves along circular surfaces of the rear edges of the airfoils and is disposed while keeping a distance from outer surfaces of the rear edges.

64. 发明专利

JPH09196377A GAS TURBINE COMBUSTOR 失效
公开(公告)号：JPH09196377A
公开(公告)日：1997-07-29
申请号：JP359196
申请日：1996-01-12
申请人： HITACHI LTD
发明人： KOGANEZAWA TOMOKI , ICHIKAWA KUNIHIRO , SAKURAI SHIGEO , ISHIZUKI TOSHIO , HAYASHI NORIYUKI , KOBAYASHI SHIGEYOSHI , ISHIBASHI YOJI , SASADA TETSUO , NAKAHARA SHINICHI
IPC分类号： F23R3/32 , F23R3/42
摘要： PROBLEM TO BE SOLVED: To keep necessary cooling performance with a less pressure loss quality not deteriorating the total efficiency of a gas turbine for a premixing combustion, and reduce combustion vibration stress by providing a spiral rib on an outer peripheral surface of a liner disposed downstream a combustor. SOLUTION: A rib 13 has a spiral with respect to a combustor 2 axis so as to turn the combustor axis. The rib 13 obliquely intersects a combustor liner 12 axis longitudinally thereof over part or the whole of an outer surface of the combustor liner 12, and extends substantially a spiral shape. A flow direction of main air flowing through a flow passage is longitudinal with respect to the liner 12 (parallel to the liner axis 12), and the rib 13 has a spiral formed thereon so as to obliquely intersect the air flow. Hereby, upon premixing combustion excessive combustion vibration produced on the combustor liner is reduced, and a boundary layer of cooling air is disturbed three-dimensionally so that convection flow cooling performance is improved.

65. 发明专利

JPH08338631A FLAME HOLDER FOR GAS TURBINE COMBUSTOR 失效
公开(公告)号：JPH08338631A
公开(公告)日：1996-12-24
申请号：JP14711495
申请日：1995-06-14
申请人： HITACHI LTD
发明人： ICHIKAWA KUNIHIRO , SAKURAI SHIGEO , FUKUDA YOSHIO , NAKAHARA SHINICHI
IPC分类号： F23R3/20 , F23R3/32
摘要： PURPOSE: To reduce an excessive, thermal stress generated in the boundaries of combustion parts and non-combustion parts and prevent the damage of a flame holder by providing gaps having their depth to the upstream side of combustible premixed gas in the boundaries of the combustion parts of divisional combustion and the non- combustion parts on the ring shaped disk having a trapezoidal section and the cylindrical base of the flame holder. CONSTITUTION: A gas turbine combustor comprises a first stage combustion cylinder, a second stage combustion cylinder 6 provided in the downstream side and outer periphery thereof and a flame holder 13 provided on a flow passage immediately after a second stage premixed air current flows out from an annular premixer provided between both the combustion gas cylinders. In this case, the flame holder 13 comprises a cylindrical base 22 and a ring shaped disk 21 having a trapezoidal section which is connected to the downstream end having the same diameter as that of the base 22. The ring shaped disk 21 is divided into four parts in the circumferential direction and a gap 31 having its depth in the longitudinal direction of the flame holder 13 is formed for every divided area. Thus, a thermal stress generated in the boundary 38 of a combustion part 36 and a non-combustion part 37 is reduced, so that the damage of the flame holder 13 is prevented.

66. 发明专利

JPH08193942A METHOD FOR DETECTING SENSITIZATION OF AUSTENITE BASED STAINLESS STEEL 失效
公开(公告)号：JPH08193942A
公开(公告)日：1996-07-30
申请号：JP368895
申请日：1995-01-13
申请人： HITACHI LTD
发明人： ICHIKAWA KUNIHIRO , HAYASHI MAKOTO , SAKURAI SHIGEO , ENOMOTO KUNIO
IPC分类号： G01N17/00 , G01N3/40 , G01N33/20
摘要： PURPOSE: To easily and quantitatively measure the sensitivity to local stress corrosion crack by determining the ratio of the hardness at the grain boundary existing in a predetermined region to the hardness in each grain on a polished and etched surface. CONSTITUTION: Hardness Hv1 at the grain boundary 1 of a sample subjected to solution processing is not different significantly from the hardness Hv T in a grain 2 but the hardness Hv1 ) of a sample subjected to heat treatment for sensitization is higher than the hardness Hv T. It results from the fact that a chromium carbide is deposited in the grain boundary 1 through the heat treatment for sensitization and the grain boundary 1 is hardened. Consequently, the extent of sensitization of material, and thereby the extent of deterioration of corrosion resistance, can be determined based on the hardness of the grain boundary 1. Individual grain boundaries 1 in a predetermined region and the hardness Hv1 , Hv T in the grain are then measured and the extent of sensitization R1 is determined based on the ratio Hv1 /Hv T. and a decision is made that the grain boundary is sensitized when the R1 is higher than a set value. An extent of sensitization R2 is also determined based on the ratio Ns/N of the total number of grain boundaries N present in a predetermined region and the number Ns of sensitized grain boundaries. The larger the value of R1 , R2 , the higher the sensitivity of corrosion crack.

67. 发明专利

JPH07233908A GAS TURBINE BURNER 失效
公开(公告)号：JPH07233908A
公开(公告)日：1995-09-05
申请号：JP2231294
申请日：1994-02-21
申请人： HITACHI LTD
发明人： ICHIKAWA KUNIHIRO , MATSUDA KENSHO , AZUHATA SHIGERU , IIZUKA NOBUYUKI , MORITOMO YOSHIKAZU , NAKAYAMA SENJI
IPC分类号： F23C3/00
摘要： PURPOSE:To eliminate a damage of a flame stabilizer for a gas turbine burner by providing a plurality of notches opened at an upstream side end face of a cylindrical base and each having a depth toward a downstream side of a combustible premixed gas flowing direction. CONSTITUTION:A cylindrical base 22 of a flame stabilizer 13 is set, for example, by six flame stabilizer indicating plates 26. A peripheral length of the base 22 between the plates 26 is divided into three zones at an equal interval. Twelve notches 31 of a total amount each having a depth in a longitudinal direction of the stabilizer 13 are radially formed at the base 22 in each of the divided zones. That is, the notches are radially disposed with respect to an axis of a burner, and passed between inner and outer peripheries of the base 22. A circular hole 32 having a diameter of about three times as large as the width of the notch 31 is formed at the end of the notch 31 to prevent cracking from the notch 31. In this case, the more the number of the notches is increased, the greater a thermal stress generated at a connected part 27 of the base 22 to the plate 26 is decreased.

68. 发明专利

JPH0634624A SENSITIZATION DETECTION OF AUSTENITIC STAINLESS STEEL 失效
公开(公告)号：JPH0634624A
公开(公告)日：1994-02-10
申请号：JP18654692
申请日：1992-07-14
申请人： HITACHI LTD
发明人： ICHIKAWA KUNIHIRO , HAYASHI MAKOTO
IPC分类号： G01N1/32 , G01N17/00 , G01N33/20
摘要： PURPOSE:To evaluate sensitivity of stress corrosion cracking of a material by image-processing a metal structure observed with a microscope after etching treatment, measuring width and area of a grain boundary and judging a degree of local sensitization. CONSTITUTION:The surface of an austenitic stainless steel receiving thermal effect such as welding is polished, etched with oxalic acid, observed with a microscope and image-processing is performed. After the treatment, width B, length L and area S of the grain boundary thereof are measured, the grain boundary whose width B is larger than specified width is judged a sensitization grain boundary and a ratio R1 of the number of the sensitization grain boundary Ns to the other number of the whole grain boundary N is found. In addition, the multiplication of width B0 of a non-sensitive grain boundary and length thereof L is made reference area S0 and another ratio R2 of the area S0 to the other area of the whole grain boundary is found from a specific expression. From the results of the ratio R. or the other ratio R2 judgement of a degree of sensitization, namely, quantative evaluation of the sensitivity of stress corrosion cracking is made possible.

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