JP2011202631A - Sensible heat recovery device for hot-rolled coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensible heat recovery device which recovers sensible heat of hot-rolled coils.SOLUTION: The sensible heat recovery device for recovering the sensible heat of the hot-rolled coils 20 includes a stirling engine 10 for repeating expansion of working gas due to a heating operation of a heater 13a and compression of the working gas due to a cooling operation of a cooler to generate kinetic energy, and heat transfer members 51, 52 for contacting the heater and the hot-rolled coils to transfer the sensible heat of the hot-rolled coils to the heater. The heater and the heat transfer members are inserted into inner diameter parts 21 which form spaces in the centers of the hot-rolled coils.

Description

  The present invention relates to a sensible heat recovery device that recovers sensible heat of a hot-rolled coil.

  Conventionally, since the temperature of the coil (hot rolled coil) wound after hot rolling is 500 to 800 ° C., the coil is cooled to room temperature in the coil yard. However, enormous sensible heat of the hot-rolled coil is released into the atmosphere in this cooling process, and effective utilization of this sensible heat has been demanded.

  Therefore, Patent Document 1 describes a method of recovering the sensible heat of a hot-rolled coil by bringing the hot-rolled coil into contact with water in a sealed container and generating steam having a pressure equal to or higher than atmospheric pressure. Patent Document 2 describes a method of recovering sensible heat of a hot-rolled coil by immersing the hot-rolled coil in molten salt to generate steam.

  On the other hand, Patent Document 3 describes a device that lowers the temperature inside a freezer compartment connected to a Stirling engine using a Stirling engine.

Japanese Patent Laid-Open No. 64-075801 JP 59-080730 A Japanese Patent Laid-Open No. 08-303896

  An object of the present invention is to provide a sensible heat recovery device that can recover sensible heat of a hot-rolled coil by means different from the techniques described in Patent Documents 1 and 2.

  The present invention is a sensible heat recovery device that recovers sensible heat of a hot-rolled coil, and generates a kinetic energy by repeatedly expanding the working gas by heating the heater and compressing the working gas by cooling the cooler. And a heat transfer member that contacts the heater and the hot-rolled coil and transmits sensible heat of the hot-rolled coil to the heater.

  Here, the heater and the heat transfer member can be inserted into an inner diameter portion that forms a space in the center of the hot-rolled coil. And the taper surface which inclined with respect to the insertion direction to an internal-diameter part can be provided with respect to the area | region which mutually contacts among a heater and a heat-transfer member.

  Of the heat transfer member, the contact surface that contacts the inner diameter portion can be formed in a shape along the inner diameter portion. Thereby, the contact area of a heat-transfer member and an internal diameter part is securable. Further, the contact surface of the heat transfer member can be brought into contact with a region different from the region where the end of the hot-rolled coil is located in the inner diameter portion. The heat transfer member can be formed in a shape that covers the heater. Thereby, the heat transmitted from the hot rolled coil to the heat transfer member can be efficiently transmitted to the heater.

  A first elevator that is disposed below the conveyor that conveys the hot-rolled coil and moves the Stirling engine between the position where the heater enters the inner diameter portion and the position where the heater retracts from the inner diameter portion, and the conveyor And a second elevator that raises and lowers the heat transfer member between a position that has entered the inner diameter portion and a position that has retreated from the inner diameter portion. Accordingly, the heat transfer member and the heater can be brought into contact with the hot rolled coil conveyed to a predetermined position by the conveyor, and the sensible heat of the hot rolled coil can be maintained while the hot rolled coil remains on the conveyor. Can be recovered.

  According to the present invention, the sensible heat of the hot-rolled coil is transmitted to the heater of the Stirling engine by using the heat transfer member, so that the sensible heat of the hot-rolled coil is not wasted and used as a power source for the Stirling engine. can do.

It is a figure explaining operation | movement of a Stirling engine. It is a figure explaining operation | movement of a Stirling engine. It is a figure explaining operation | movement of a Stirling engine. It is a figure explaining operation | movement of a Stirling engine. It is a figure which shows the conveyance mechanism of a hot rolling coil. It is the schematic which shows the structure of the sensible heat recovery apparatus which is Embodiment 1 of this invention. In Embodiment 1, it is an external view of a pair of heat-transfer block. It is a figure which shows the process of making a heat-transfer block contact the internal diameter part of a hot-rolling coil. It is a figure which shows the process of making a heat-transfer block contact the internal diameter part of a hot-rolling coil. It is a figure which shows the process of making a heat-transfer block contact the internal diameter part of a hot-rolling coil. It is a figure which shows the process of making the heater of a Stirling engine contact a heat-transfer block. It is a figure which shows the process of making the heater of a Stirling engine contact a heat-transfer block. It is a figure which shows the process of making the heater of a Stirling engine contact a heat-transfer block.

Hereinafter, embodiments of the present invention will be described.
(Embodiment 1)

  A sensible heat recovery apparatus according to Embodiment 1 of the present invention will be described. The sensible heat recovery apparatus according to the present embodiment converts the thermal energy of the hot-rolled coil into kinetic energy using a Stirling engine.

  First, the operation principle of the Stirling engine will be described with reference to FIGS. 1A to 1D. 1A to 1D are diagrams illustrating the configuration of the Stirling engine and explaining the operation of the Stirling engine.

  The Stirling engine 10 includes a first cylinder 12 that accommodates the displacer piston 11. An expansion space (high temperature space) S <b> 1 and a compression space (low temperature space) S <b> 2 are formed in the first cylinder 12. . A heat exchanger 13 disposed outside the first cylinder 12 is connected to the first cylinder 12, and the heat exchanger 13 and the first cylinder 12 are filled with working gas.

  A seal is provided between the displacer piston 11 and the first cylinder 12 to prevent leakage of working gas. As the working gas, it is preferable to use a gas that can improve the heat transfer performance or reduce the pressure loss in the heat exchanger 13, and for example, helium can be used.

  The heat exchanger 13 includes a heater 13a, a regenerator 13b, and a cooler 13c. The heater 13a is connected to the expansion space S1 in the first cylinder 12, and the working gas moves between the heater 13a and the expansion space S1. The cooler 13c is connected to the compression space S2 in the first cylinder 12, and the working gas moves between the cooler 13c and the compression space S2.

  The heater 13a heats the working gas and expands the working gas. The cooler 13c cools the working gas and compresses the working gas. A regenerator 13b is disposed between the heater 13a and the cooler 13c, and the regenerator 13b has a function of storing heat from the heater 13a. When the working gas moves from the heater 13a to the cooler 13c, the heat of the working gas is stored in the regenerator 13b. When the working gas moves from the cooler 13c to the heater 13a, the working gas receives heat stored in the regenerator 13b and becomes a high temperature state. The regenerator 13b can be configured, for example, by laminating a wire mesh formed of stainless steel.

  A second cylinder 14 is connected to the compression space S <b> 2 of the first cylinder 12, and a power piston 15 is disposed in the second cylinder 14. A seal is provided between the power piston 15 and the second cylinder 14 to prevent leakage of working gas. The displacer piston 11 and the power piston 15 are connected to the crankshaft via a connecting rod, and the reciprocating motion of the displacer piston 11 and the power piston 15 is converted into the rotational force of the crankshaft.

  Next, the operation of the Stirling engine 10 will be described.

  In FIG. 1A, when the displacer piston 11 is moved in the direction of the arrow D1, the working gas existing in the compression space S2 passes through the heat exchanger 13 and moves to the expansion space S1. Here, when the working gas in the compression space S2 passes through the cooler 13c and passes through the regenerator 13b, it receives the heat stored in the regenerator 13b and moves to the heater 13a. The working gas that has moved to the heater 13a expands when heated by the heater 13a.

  The expanded working gas moves to the expansion space S1, thereby pushing the displacer piston 11 in the direction of the arrow D1. By the movement of the displacer piston 11, the working gas in the compression space S2 also moves to the second cylinder 14, and moves the power piston 15 in the second cylinder 14 in the direction of arrow D2, as shown in FIG. 1B. .

  Since displacer piston 11 and power piston 15 are connected via a crankshaft, displacer piston 11 moves in the direction of arrow D3 in FIG. 1C in response to movement of power piston 15 in the direction of arrow D2. To do. When the displacer piston 11 moves in the direction of the arrow D3, the working gas in the expansion space S1 passes through the heat exchanger 13 and moves to the compression space S2.

  Here, the working gas in the expansion space S1 is deprived of heat when passing through the regenerator 13b and cooled by the cooler 13c. Since the working gas cooled by the cooler 13 c is compressed, the working gas in the second cylinder 14 moves to the first cylinder 12. Accordingly, the power piston 15 moves in the direction of the arrow D4.

  As described above, the displacer piston 11 and the power piston 15 are reciprocated by expanding and compressing the working gas in the expansion space S1 and the compression space S2, thereby generating the rotational force (kinetic energy) of the crankshaft. Can do.

  1A to 1D shows an outline of the Stirling engine 10, and the positional relationship between the displacer piston 11 and the power piston 15 and the positional relationship between the first cylinder 12 and the second cylinder 14 are appropriately changed. be able to. That is, the Stirling engine 10 used in this embodiment may be any engine that can generate kinetic energy by repeatedly expanding and contracting the working gas.

  Next, in the sensible heat recovery apparatus of the present embodiment, a mechanism for transmitting the heat of the hot rolled coil to the heater 13a of the Stirling engine 10 will be described.

  First, as shown in FIG. 2, the hot-rolled coil 20 is placed on a pair of conveyors 31 and 32, and is conveyed in one direction by the conveyors 31 and 32. An inner diameter portion 21 that forms a space is provided at the center of the hot rolled coil 20. The pair of conveyors 31 and 32 hold the hot-rolled coil 20 at a position that does not block the space of the inner diameter portion 21.

  As shown in FIG. 3, the Stirling engine 10 is disposed below the conveyors 31 and 32, and the Stirling engine 10 is supported by the first elevator 40. The first elevator 40 moves (rises) the Stirling engine 10 in a direction approaching the conveyors 31 and 32 and moves (lowers) in a direction away from the conveyors 31 and 32. The 1st elevator 40 can use a well-known structure suitably, for example, can employ | adopt the mechanism using a pantograph.

  A heater 13 a is provided on the top of the Stirling engine 10. When the Stirling engine 10 is raised by the first elevator 40, the heater 13 a can pass between the pair of conveyors 31 and 32 and enter the inner diameter portion 21 of the hot rolled coil 20. Further, when the Stirling engine 10 is lowered by the first elevator 40, the heater 13a can be retracted from the inner diameter portion 21, and can be returned to the initial position through the pair of conveyors 31 and 32.

  The heater 13a has a distal end portion 13a1 formed of a tapered surface and a proximal end portion 13a2 formed in a columnar shape. A diameter R1 of the base end portion 13a2 is smaller than a diameter R2 of the inner diameter portion 21 of the hot rolled coil 20. The distal end portion 13a1 has a diameter that decreases from the proximal end portion 13a2 side toward the distal end.

  A pair of heat transfer blocks 51 and 52 are disposed above the pair of conveyors 31 and 32. The heat transfer blocks 51 and 52 are formed in the same shape and are arranged in plane symmetry. As will be described later, the heat transfer blocks 51 and 52 are used to transmit the sensible heat of the hot-rolled coil 20, and thus are preferably formed of a material having a high thermal conductivity (for example, a copper alloy).

  The heat transfer blocks 51 and 52 are connected to the arms 53a and 53b of the second elevator 53, and move (lower) in a direction approaching the pair of conveyors 31 and 32 by the operation of the second elevator 53. It moves (rises) away from the conveyors 31 and 32.

  By lowering the heat transfer blocks 51 and 52, the heat transfer blocks 51 and 52 can enter the inner diameter portion 21 of the hot rolled coil 20. Further, by raising the heat transfer blocks 51 and 52, the heat transfer blocks 51 and 52 can be retracted from the inner diameter portion 21.

  Further, the arms 53a and 53b of the second elevator 53 can move in a direction approaching each other or in a direction away from each other. In the state shown in FIG. 3, the heat transfer blocks 51 and 52 are in contact with each other.

  In FIG. 4, the external view of the heat-transfer blocks 51 and 52 is shown. A groove 51 a is formed on the surface of the heat transfer block 51 that faces the heat transfer block 52. Similarly, a groove portion 52 a is formed on the surface of the heat transfer block 52 that faces the heat transfer block 51. The groove portions 51a and 52a are formed along the tip portion 13a1 of the heater 13a in the Stirling engine 10 and are in contact with the tip portion 13a1. The outer peripheral surfaces 51 b and 52 b of the heat transfer blocks 51 and 52 are formed in a shape along the inner diameter portion 21 of the hot rolled coil 20.

  Next, the operation when recovering sensible heat from the hot rolled coil 20 will be described.

  First, the hot-rolled coil 20 is conveyed to a predetermined position by the conveyors 31 and 32. The predetermined position is a position of the hot rolled coil 20 that allows the heat transfer blocks 51 and 52 and the heater 13a to enter the inner diameter portion 21 as described above.

  FIG. 5A shows the initial positions of the heat transfer blocks 51 and 52. Here, as shown in FIG. 5A, by driving the second elevator 53, the heat transfer blocks 51 and 52 in the initial position are lowered, and the heat transfer blocks 51 and 52 are placed on the inner diameter portion 21 of the hot rolled coil 20. Let it enter.

  Next, as shown in FIG. 5B, the outer peripheral surfaces 51b and 52b of the heat transfer blocks 51 and 52 are heated by moving the heat transfer blocks 51 and 52 away from each other, in other words, in the radial direction of the hot rolled coil 20. The inner diameter portion 21 of the extension coil 20 is brought into contact. Since the outer peripheral surfaces 51b and 52b of the heat transfer blocks 51 and 52 are formed in a shape along the inner diameter portion 21, as shown in FIG. 5C, the outer peripheral surfaces 51b and 52b contact the inner diameter portion 21 without a gap. Can be made. FIG. 5C is a top view when viewed from the direction of arrow D5 in FIG. 5B.

  Here, since one end portion of the hot rolling coil 20 exists in the inner diameter portion 21 of the hot rolling coil 20, the outer peripheral surfaces 51 b and 52 b of the heat transfer blocks 51 and 52 are in contact with one end of the hot rolling coil 20. Preferably not. In the region where one end of the hot-rolled coil 20 is located, there is a step corresponding to the thickness of the hot-rolled coil 20, so that the outer peripheral surfaces 51b, 52b of the heat transfer blocks 51, 52 are placed in the region where the one-end is located. If they are brought into contact with each other, a gap is generated between the outer peripheral surfaces 51 b and 52 b and the inner diameter portion 21. Since this gap becomes an air layer having a lower thermal conductivity than the heat transfer blocks 51 and 52, the sensible heat of the hot rolled coil 20 cannot be efficiently transmitted to the electric blocks 51 and 52.

  When the hot-rolled coil 20 is placed on the conveyors 31 and 32, if the orientation of the hot-rolled coil 20 is aligned, the position where the one end of the hot-rolled coil 20 exists can be generally fixed in the inner diameter portion 21. it can. On the other hand, by using a sensor, it is possible to detect a region in the inner diameter portion 21 where one end of the hot-rolled coil 20 exists. When detecting one end of the hot-rolled coil 20, the direction of the heat-transfer blocks 51 and 52 is changed according to the detection result, so that the outer peripheral surfaces 51b and 52b of the heat-transfer blocks 51 and 52 are hot-rolled coil 20. It can be made not to contact one end of. In order to change the direction of the heat transfer blocks 51 and 52, the heat transfer blocks 51 and 52 may be rotated with the insertion direction into the inner diameter portion 21 as the rotation axis.

  Next, by driving the first elevator 40, the Stirling engine 10 at the initial position is raised as shown in FIG. 6A, and the heater 13a enters the inner diameter portion 21 of the hot-rolled coil 20. Since the heat transfer blocks 51 and 52 are already positioned in the inner diameter portion 21 of the hot-rolled coil 20, as the Stirling engine 10 is raised, the tip portion 13a1 of the heater 13a is transferred as shown in FIG. 6B. It contacts the groove portions 51a and 52a of the heat blocks 51 and 52. FIG. 6C is a top view when viewed from the direction of arrow D6 in FIG. 6B.

  Here, since the tip portion 13a1 of the heater 13a and the groove portions 51a and 52a of the heat transfer blocks 51 and 52 are configured with tapered surfaces, the tip portion 13a1 is in a state where the tip portion 13a1 is in contact with the groove portions 51a and 52a. Is displaced upward, the outer peripheral surfaces 51 b and 52 b of the heat transfer blocks 51 and 52 can be brought into close contact with the inner diameter portion 21 of the hot-rolled coil 20. Thereby, the sensible heat of the hot-rolled coil 20 is transmitted to the heater 13 a via the heat transfer blocks 51 and 52 and can be used as a heat source of the Stirling engine 10.

  According to this embodiment, the sensible heat of the hot-rolled coil 20 can be recovered as kinetic energy, and can be effectively utilized as electrical energy using a generator. Moreover, in this embodiment, since the sensible heat of the hot-rolled coil 20 can be positively collected, the cooling period of the hot-rolled coil 20 is shortened compared with the case where the hot-rolled coil 20 is radiated by a coil yard. You can also

  In this embodiment, although the heat transfer blocks 51 and 52 of the shape shown in FIG. 4 are used, it is not restricted to this. That is, it is only necessary that the heat transfer block can come into contact with the heater 13a and the inner diameter portion 21 in a state where the heater 13a of the Stirling engine 10 has entered the inner diameter portion 21 of the hot rolling coil 20.

  In the present embodiment, the two heat transfer blocks 51 and 52 are used, but three or more heat transfer blocks may be used. That is, when the outer peripheral surface of the heater 13a (the surface facing the inner diameter portion 21) is divided into a plurality of regions, the heat transfer block can be arranged at a position corresponding to each region. In this case as well, each heat transfer block may be formed with a tapered surface that contacts the tapered surface of the heater 13a. Thereby, the heat transfer block can be efficiently brought into contact with the heater 13a and the inner diameter portion 21 of the hot rolled coil 20.

  In this embodiment, as shown in FIG. 2, the Stirling engine 10 and the heat transfer blocks 51 and 52 are caused to enter the inner diameter portion 21 from the vertical direction in a state where the hot-rolled coil 20 is placed horizontally. It is not limited. That is, a method in which the hot-rolled coil 20 is placed vertically and the Stirling engine 10 and the heat transfer blocks 51 and 52 enter the inner diameter portion 21 from the left and right in the horizontal direction may be used.

10: Stirling engine, 11: Displacer piston, 12: First cylinder,
13: heat exchanger, 13a: heater, 13a1: distal end, 13a2: proximal end,
13b: regenerator, 13c: cooler, 14: second cylinder, 15: power piston,
S1: expansion space, S2: compression space, 20: hot rolled coil, 21: inner diameter part,
31, 32: conveyor, 40: first elevator, 51, 52: heat transfer block,
51a, 52a: groove, 51b, 52b: outer peripheral surface, 53: second elevator,
53a, 53b: arm,

Claims (7)

A sensible heat recovery device for recovering sensible heat of a hot-rolled coil,
A Stirling engine that generates kinetic energy by repeatedly expanding the working gas by heating the heater and compressing the working gas by cooling the cooler;
A heat transfer member that contacts the heater and the hot-rolled coil to transmit sensible heat of the hot-rolled coil to the heater;
A sensible heat recovery device comprising:   The sensible heat recovery apparatus according to claim 1, wherein the heater and the heat transfer member are inserted into an inner diameter portion that forms a space in the center of the hot-rolled coil.   The sensible heat recovery apparatus according to claim 2, wherein the heater and the heat transfer member have a tapered surface inclined with respect to a direction of insertion into the inner diameter portion in a region where they are in contact with each other.   The sensible heat recovery apparatus according to claim 2 or 3, wherein a contact surface of the heat transfer member that contacts the inner diameter portion is formed in a shape along the inner diameter portion.   The sensible heat recovery apparatus according to claim 4, wherein the contact surface of the heat transfer member is in contact with a region of the inner diameter portion different from a region where an end of the hot-rolled coil is located.   The sensible heat recovery apparatus according to any one of claims 1 to 5, wherein the heat transfer member is formed in a shape covering the heater. The Stirling engine is moved between a position where the heater enters the inner diameter portion and a position where the heater retracts from the inner diameter portion. A first drive mechanism;
Similar to the first driving mechanism, the hot rolling coil is disposed at a position where it can enter the inner diameter portion, and the position between the position where the hot rolling coil enters the inner diameter portion and the position retracted from the inner diameter portion. A second drive mechanism for moving the heat transfer member;
The sensible heat recovery apparatus according to any one of claims 2 to 6, wherein

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