JP2006098035A - Regenerative heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a technique is applied limitedly only to mass production because of depreciating an inexpensive molding die and facility, in a regenerative heat exchanger of a small gas turbine using a primary surface and a brazed plate and fin of complicated shapes, and joined by welding a blade manufactured by press work using the expensive molding die, and a problem wherein scroll and wiring are required for connecting a turbine and a compressor, when using a general quadrangular heat exchanger installed separately, to make size reduction difficult, since a useless space space is generated on a circumference in a heat exchanger arranged on the circumference with a plurality of rectangular heat exchangers using a general fin. <P>SOLUTION: A V-shaped flow passage is formed by joining a wave-formed plate developed on the circumference with cylinders in inner and outer circumferences, and continuous rectangular fins are inserted into the flow passage in the plate to be joined to the plate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    Regarding heat exchangers used in gas turbines, etc.

    In order to improve the efficiency of gas turbines, regenerative heat exchangers that recover the heat energy of exhaust gas by transferring it to the air at the outlet of the compressor are used. In particular, a small gas turbine employs a heat exchanger arranged in an annular shape on the outer peripheral side of the turbomachine in order to reduce the size and weight.

    A typical small gas turbine, Capstone's micro gas turbine, is a new compact and lightweight regenerative heat trained from the heat exchanger configuration and technology developed for the M1 tank gas turbine AGT1500. An exchanger is used.

    A block diagram of a capstone micro gas turbine is shown in FIG. The high pressure air from the compressor enters the heat exchanger from the inner diameter side, exits to the inner diameter side, enters the combustor, becomes a high-temperature gas by the combustion of fuel, and enters the heat exchanger from the rotating shaft direction after driving the turbine. , Exit in the axial direction. During this time, heat is exchanged with the high-pressure air in the heat exchanger.

    The primary surface recuperator (PSR) shown in FIGS. 8 and 9 is used for the capstone micro gas turbine, and the gas turbine of Ingersoll-Rand is shown in FIGS. Brazed plate and fin recuperator (PFR) is used.

    As shown in FIGS. 9 and 10, both regenerative heat exchangers have a complicatedly shaped flow path formed by fine press processing. The press forming process for forming the flow path uses an expensive precision die, and its depreciation requires a sales number of about several hundred thousand units.

    In addition, as described with reference to FIG. 7, a cylindrical regenerative heat exchanger configured such that air enters from the inner diameter side, flows out to the inner diameter side, and high-temperature gas flows in the axial direction against the air is a gas turbine. The overall size increases.

    A regenerative heat exchanger has been developed in which a number of square heat exchanger elements using versatile corrugated fins are arranged in a practice area, and profitable even in small-scale production. The configuration of this heat exchanger is shown in FIG. In this configuration, there is a portion where there is no heat exchanger element on the circumference, and a case for individually sealing the outer periphery of the heat exchanger element is required, and the configuration is complicated and the volume occupied by the heat exchanger is required. The wasteful volume is large.

Means for solving the problem

    A corrugated fin is inserted into a V-shaped channel formed by a corrugated plate that circulates around the circumference that separates the air channel and the hot gas channel.

    The angle formed by both side surfaces of the corrugated fin is made substantially the same as the above-mentioned V-shaped angle to facilitate insertion into the flow path.

    The corrugated fin and corrugated fin are manufactured by pressing or plate bending.

    1 to 5 show the configuration of the first embodiment. FIG. 1 shows a front sectional view and a side view of the entire regenerative heat exchanger. The upper part of the front sectional view shows an air flow path (100) and the lower part shows a gas flow path (200). is there. The high pressure air produced by the compressor enters from the inlet (110) of the air flow path (100) of the heat exchanger and flows out from the outlet (150) provided in the inner cylinder (600) toward the combustor. The corrugated plate (300), the outer cylinder (500), and the inner cylinder (600) forming the air channel (100) and the gas channel (200) are joined by brazing, welding, or the like. The air channel (100) and the gas channel (200) in the front sectional view are shown with the corrugated fins (400) omitted.

  The air flow path (100) is formed of a corrugated plate (300), the inner diameter side is open, and is in contact with the inner cylinder (600) to prevent air leakage. The inner cylinder (600) at the outlet (150) is open. The air flow path (100) is closed with a sealing portion (140). Further, the hot gas outlet (120) is closed by the outer peripheral portion of the corrugated plate (300). The corrugated fin (400) joined to the corrugated plate (300) in the air flow path (100) is provided between the inlet (110) and the cutting line (130).

    The hot gas exiting from the turbine enters from the inlet (210) of the gas flow path (200) and is discharged to the outside from the outlet (250) provided in the outer cylinder (500). The gas flow path (200) formed by the corrugated plate (300) is in contact with the air flow path (100) via the corrugated plate (300), and heat exchange is performed to heat the air. The corrugated fin (400) is joined to the corrugated plate (300) by brazing, welding, or the like, and is cut along a cutting line (230), and the gas flow path (200) is a sealing portion in the axial direction. Blocked at (240). Moreover, since the gas flow path (200) formed by the corrugated plate (300) is open to the outer peripheral side, it is blocked by the outer cylinder (500).

    2A shows the positional relationship between the air channel (100) formed by the corrugated plate (300), the gas channel (200), and the center of the cylindrical regenerative heat exchanger, and FIG. Each side of the mold plate (300) is shown. The air flow path (100) is surrounded by side surfaces (320), (340) and an outer peripheral surface (330), and the inner peripheral surface is open. The gas flow path (200) is formed of side surfaces (320), (341) and an inner peripheral surface (310), and the outer peripheral surface is open.

  3 (a) shows the configuration of the corrugated fin (400), and FIG. 3 (b) shows the corrugated fin (400) in the air channel (100) and the gas channel (200) formed by the corrugated plate (300). Shows the situation. The corrugated fin (400) is formed of positioning portions (410) and (460), fin portions (420) and (440), and joint portions (430) and (450). The angle formed by the joint portions (430) and (450) of the corrugated fin (400) is set to be approximately equal to the angle formed by the side surfaces (320) and (340) of the corrugated plate (300). The corrugated fins (400) are arranged so as to have a substantially mirror image relationship with the corrugated plate (300) interposed therebetween.

  4 (a) and 4 (b), a bending line (405) of the plate for producing the corrugated plate (300), inner peripheral surfaces (310), (311), (312), side surfaces (320), (321). , (322), (340), (341), (342), outer peripheral surfaces (330), (331), (332), and the shape after bending.

  FIG. 5 (a) shows the shape of the corrugated fin (400), and FIG. 5 (b) shows the relationship between the plate before bending, its bending line (405), and each part before and after bending. The corrugated fin (400) includes positioning portions (410), (460), fin portions (420), (421), (440), (441)..., Joint portions (430), (431), (450 ), (451)...

  FIG. 6 shows the sealing shape of the sealing portions (140) and (240) at the ends in the flow path axial direction. (A) Side surfaces (340), (321), (341), an inner peripheral part (311), an outer peripheral part of the air flow path (100) and the gas flow path (200) formed by the corrugated plate (300) (331). (B) shows the installation position of the spacer (145). (C) shows an example in which the side surfaces (340) and (321) and the inner peripheral surface (311) of the gas flow path (200) are crushed and sealed by brazing or welding. (D) shows an example in which the side surfaces (341) and (321) and the outer peripheral surface (331) of the air flow path (100) are crushed and sealed by brazing or welding. (E) shows an example in which a spacer (145) is inserted and sealed on the outer peripheral side of the gas flow path (200), and (f) shows a spacer (145) on the inner peripheral side of the air flow path (100). The example inserted and sealed is shown.

The invention's effect

  In a cylindrical regenerative heat exchanger, a regenerative heat exchanger capable of producing a plate having a thickness of 1 mm or less by plate bending is a corrugated plate that is developed in a circular shape, and a low temperature gas (air) flow path and a high temperature gas flow To provide a regenerative heat exchanger having a high temperature efficiency in which a path is formed and corrugated fins are inserted into both flow paths to join a corrugated plate.

  Since the regenerative heat exchanger of the present invention can be manufactured by both plate bending and pressing, it is suitable for low-volume multi-product production and mass production, and can be produced at low cost in both small and large quantities.

  Air enters from the axial direction and flows out in the radial direction, and hot gas enters from the axial direction and flows out in the radial direction outward, so that the area where the air and the gas come into contact with each other through the corrugated plate can be widened. .

  The corrugated fin fins and joints in the air flow channel and gas flow channel are installed in positions that are almost mirror images of each other across the corrugated plate, so that the corrugated fin acts on the corrugated plate due to fin thermal expansion. The power is offset.

  Since the air flow path and the gas flow path formed by the corrugated plate have a V-shape, the gap between the corrugated plate and the corrugated fin is increased by inserting the corrugated fin to the outer peripheral side from the predetermined position. Easy to insert and assemble fins.

  In this specification, a regenerative heat exchanger using hot gas and air as working fluids used in a gas turbine is described as an example. However, the present invention is also applicable to general high temperature fluid and low temperature fluid heat exchangers. Applicable.

Regenerative heat exchanger configuration diagram Air flow path and gas flow path formed by corrugated plate Configuration diagram of corrugated plate and corrugated fin Bending line and shape of plate bending wave plate Corrugated fin shape and plate bending line Sealing of channel end Micro gas turbine with conventional regenerative heat exchanger Example of conventional regenerative heat exchanger Conventional primary surface heat exchanger element Conventional blazed plate heat exchanger element Regenerative heat exchanger formed with conventional square heat exchanger elements

Explanation of symbols

(100) Air channel (110) Inlet (130) Cutting line (140) Sealing part (145) Spacer (150) Outlet (200) Gas channel (210) Inlet (230) Cutting line (240) Sealing part (250) outlet (300) corrugated plate (310), (311), (312) inner periphery (320), (321), (322), (340), (341), (342) side surface (400 ) Corrugated fin (410), (460) Positioning part (420), (421), (422), (423), (424), (440), (441), (442), (443), (444) ) Fins (430), (431), (432), (433), (434), (450), (451), (452), (453) Joint (500) Outer cylinder (600) Inner cylinder

Claims (8)

  Heat that forms a flow path that has a flow path through which high-temperature and low-temperature fluid flows, performs heat exchange between the fluids through a partition that divides the fluid, and forms a thin plate of the partition between the fluid and the fin joined to the partition In the exchanger, a corrugated plate that forms a corrugated shape developed in the circumferential direction as the partition is used, and a corrugated fin is used as the fin, and the corrugated plate and the inner diameter side and outer diameter side cylinders are joined. A V-shaped flow path of a high-temperature fluid and a low-temperature fluid is formed by the cylinder and the corrugated plate, and a continuous rectangular corrugated fin is inserted into both the flow paths and joined to the corrugated plate. Heat exchanger.   2. The heat exchanger according to claim 1, wherein the corrugated fins are arranged so as to have a mirror image relationship via a corrugated plate between the low temperature fluid flow path and the high temperature fluid flow path.   The heat exchanger according to claim 1, wherein at least one positioning portion is provided on the corrugated fin.   2. The heat exchanger according to claim 1, wherein at least one of the corrugated plate and the corrugated fin is manufactured from a thin plate by plate bending.   2. The heat exchanger according to claim 1, wherein flow paths of the low temperature fluid and the high temperature fluid are formed so as to enter from the axial direction and to exit in the radial direction.   2. The heat exchanger according to claim 1, wherein an angle formed by the joint surface of the corrugated fin is substantially equal to an angle of the V-shaped flow path formed by the corrugated plate.   In Claim 1, the two side surfaces of the corrugated plate at least one of the end portions in the axial direction on the outflow side of the low temperature fluid flow path and the high temperature fluid flow path are crushed and joined together. A heat exchanger that is sealed.   8. The heat exchanger according to claim 7, wherein spacers are inserted and joined to the inner diameter side of the low-temperature fluid passage formed by the corrugated plate and the outer diameter side of the high-temperature fluid passage and sealed.