JP4367362B2 - Waste heat recovery method and cooling bed - Google Patents

Waste heat recovery method and cooling bed Download PDF

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JP4367362B2
JP4367362B2 JP2005086491A JP2005086491A JP4367362B2 JP 4367362 B2 JP4367362 B2 JP 4367362B2 JP 2005086491 A JP2005086491 A JP 2005086491A JP 2005086491 A JP2005086491 A JP 2005086491A JP 4367362 B2 JP4367362 B2 JP 4367362B2
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conversion element
thermoelectric conversion
cooling
lake
heat
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JP2006263783A (en
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勝也 甲斐
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Sumitomo Metal Industries Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、冷却対象物をレイクに載せて放冷する冷却床、及び、冷却床での廃熱回収方法に関する。   The present invention relates to a cooling bed that cools an object to be cooled on a lake, and a waste heat recovery method in the cooling bed.

ビレットなどの冷却対象物の放冷に冷却床が用いられている。図６は冷却床１の例を示す模式図である。また、図７（ａ）は冷却床の従来のレイク（レーキ）２の要部拡大図であり、図７（ｂ）は図７（ａ）のＡ−Ａ線切断断面図である。冷却床１においては、熱間材料（冷却対象物）３を載せる材料受溝５が設けられた板状の２つのレイク２、２の一方又は両方を駆動装置４によって円運動又は楕円運動させ、レイク２に載せられた熱間材料３の移送を行っている（例えば特許文献１参照)。   A cooling bed is used to cool a cooling object such as a billet. FIG. 6 is a schematic diagram showing an example of the cooling bed 1. FIG. 7A is an enlarged view of a main part of a conventional rake 2 of the cooling bed, and FIG. 7B is a cross-sectional view taken along line AA in FIG. 7A. In the cooling floor 1, one or both of the two plate-like rakes 2, 2 provided with the material receiving grooves 5 on which the hot material (cooling object) 3 is placed are moved circularly or elliptically by the driving device 4, The hot material 3 placed on the lake 2 is transferred (see, for example, Patent Document 1).

移送の際にレイク２の材料受溝５で熱間材料３が転回されて均一に放冷される。例えばビレット搬送の場合、９００℃程度の温度を有する熱間材料３をレイク２で移送しながら３００℃以下まで放冷する。また、移送の際に、レイク２は熱間材料３から直接高熱を受けるため、レイク２が変形する等により搬送不良を起こす場合があるため、散水パイプ６によりレイク２の水冷を行っている。   During the transfer, the hot material 3 is turned in the material receiving groove 5 of the rake 2 and allowed to cool uniformly. For example, in the case of billet conveyance, the hot material 3 having a temperature of about 900 ° C. is allowed to cool to 300 ° C. or less while being transferred by the lake 2. In addition, since the lake 2 receives high heat directly from the hot material 3 at the time of transfer, the lake 2 may be cooled by the watering pipe 6 since the conveyance failure may occur due to deformation of the lake 2 or the like.

冷却床１においては、熱間材料３の熱を単に大気中に放散して冷却しているが、例えば熱間材料３を９００℃から３００℃まで冷却した場合、熱間材料３の比熱を０．１６ｋｃａｌ／ｈｒとし、平均生産量が１００ｔｏｎ／ｈｒとして試算すると、約９．６×１０6 ｋｃａｌ／ｈｒもの熱量が大気中に放散されることになる。これをｋＷに換算した場合、実に１１１００ｋＷ・ｈｒもの損失となる。このうち、仮に１％が回収できたと仮定した場合、約１１１ｋＷ・ｈｒもの電力が得られることになる。そのため、この廃熱を回収して有効に活用できれば、極めて大きなエネルギーを得ることができる。 In the cooling bed 1, the heat of the hot material 3 is simply dissipated into the atmosphere and cooled. For example, when the hot material 3 is cooled from 900 ° C. to 300 ° C., the specific heat of the hot material 3 is reduced to 0. Assuming that .16 kcal / hr and the average production amount are 100 ton / hr, a heat amount of about 9.6 × 10 6 kcal / hr is dissipated into the atmosphere. When this is converted into kW, the loss is actually 11100 kW · hr. Of these, if it is assumed that 1% can be recovered, about 111 kW · hr of power can be obtained. Therefore, if this waste heat can be recovered and used effectively, extremely large energy can be obtained.

廃熱を回収する方法としては、熱間材料からの輻射熱と対流熱を、熱電変換素子を用いて電力に変換し、変換した電力で送風機を動作させて空冷を行う冷却床が提案されている（例えば特許文献２参照)。
特開昭６１−３８２４号公報 特開平１０−２９６３１９号公報 As a method for recovering waste heat, a cooling bed has been proposed in which radiant heat and convection heat from a hot material are converted into electric power using a thermoelectric conversion element, and a fan is operated with the converted electric power to perform air cooling. (For example, refer to Patent Document 2).
Japanese Patent Laid-Open No. 61-3824 Japanese Patent Laid-Open No. 10-296319

しかし、特許文献１の方法では、熱間材料３からの輻射熱と対流熱とによって熱電変換素子で発電を行うため、熱間材料３から効率的に廃熱を回収することは困難という問題がある。   However, the method of Patent Document 1 has a problem that it is difficult to efficiently recover waste heat from the hot material 3 because electric power is generated by the thermoelectric conversion element by radiant heat and convection heat from the hot material 3. .

本発明は斯かる事情に鑑みてなされたものであり、冷却対象物からレイクに取付けてある熱電変換素子へ熱を伝導し、伝導された熱を電力に変換することにより、レイクの熱伝導によって冷却対象物の熱エネルギーを効率的に電気エネルギーに変換することができる廃熱回収方法を提供することを目的とする。   The present invention has been made in view of such circumstances, and conducts heat from the object to be cooled to the thermoelectric conversion element attached to the lake, and converts the conducted heat into electric power, thereby allowing the heat conduction of the lake. An object of the present invention is to provide a waste heat recovery method capable of efficiently converting thermal energy of an object to be cooled into electric energy.

また、本発明は、変換された電力の一部又は全部を熱電変換素子に供給し、熱電変換素子でレイクを冷却することにより、冷却床の冷却を効率良く行えると共に、冷却床設備の小型化が可能となる廃熱回収方法を提供することを他の目的とする。   In addition, the present invention supplies a part or all of the converted electric power to the thermoelectric conversion element and cools the lake with the thermoelectric conversion element, thereby efficiently cooling the cooling bed and reducing the size of the cooling bed equipment. Another object is to provide a method for recovering waste heat.

また、本発明は、レイクに熱電変換素子が取付けられていることにより、レイクの熱伝導により、効率的に冷却対象物から熱電変換素子へ熱を伝達することができる冷却床を提供することを他の目的とする。   Moreover, this invention provides the cooling bed which can transfer heat | fever from a cooling target object to a thermoelectric conversion element efficiently by the heat conduction of a lake by attaching the thermoelectric conversion element to a lake. For other purposes.

第１発明に係る廃熱回収方法は、冷却対象物をレイクに載せて放冷する冷却床での廃熱回収方法において、前記レイクの熱伝導により、冷却対象物から該レイクに取付けてある熱電変換素子へ熱を伝導し、伝導された熱を電力に変換することを特徴とする。   A waste heat recovery method according to a first aspect of the present invention is a waste heat recovery method in a cooling floor in which an object to be cooled is placed on a lake and allowed to cool. Heat is conducted to the conversion element, and the conducted heat is converted into electric power.

第２発明に係る廃熱回収方法は、第１発明において、変換された電力の一部又は全部を熱電変換素子に供給し、該熱電変換素子で前記レイクを冷却することを特徴とする。   A waste heat recovery method according to a second invention is characterized in that, in the first invention, a part or all of the converted electric power is supplied to a thermoelectric conversion element, and the rake is cooled by the thermoelectric conversion element.

第３発明に係る冷却床は、冷却対象物をレイクに載せて放冷する冷却床において、前記レイクには熱電変換素子が取付けられていることを特徴とする。   A cooling floor according to a third aspect of the present invention is a cooling floor in which an object to be cooled is placed on a lake and left to cool, and a thermoelectric conversion element is attached to the lake.

第１発明においては、冷却対象物をレイクに載せて放冷する冷却床において、レイクの熱伝導により、冷却対象物から該レイクに取付けてある熱電変換素子へ熱を伝導し、伝導された熱を電力に変換するため、従来は冷却対象物から大気中に放散されていた熱エネルギーを、電力に変換することができ、工場全体のエネルギー効率を向上させ、生産コストの削減することができる。しかも、冷却対象物及び熱電変換素子はレイクと接触しており、レイクの熱伝導により、効率的に冷却対象物から熱電変換素子へ熱が伝達される。   In the first invention, in the cooling floor where the object to be cooled is allowed to cool by placing it on the lake, heat is conducted from the object to be cooled to the thermoelectric conversion element attached to the lake by the heat conduction of the lake, and the conducted heat Therefore, it is possible to convert the thermal energy that has been dissipated from the object to be cooled into the atmosphere into electric power, improve the energy efficiency of the entire factory, and reduce the production cost. In addition, the object to be cooled and the thermoelectric conversion element are in contact with the lake, and heat is efficiently transferred from the object to be cooled to the thermoelectric conversion element by heat conduction of the lake.

第２発明においては、変換された電力の一部又は全部を熱電変換素子に供給し、該熱電変換素子で前記レイクを冷却するため、冷却床の冷却を効率良く行うことができる。冷却対象物の熱を利用してレイクの冷却を行うことにより、工場全体のエネルギー効率を向上させ、生産コストを削減することができる。また、熱電変換素子を用いてレイクの冷却を行うことにより、冷却床設備の小型化が可能となり、導入コストを削減することができる。   In the second invention, a part or all of the converted electric power is supplied to the thermoelectric conversion element, and the rake is cooled by the thermoelectric conversion element. Therefore, the cooling bed can be efficiently cooled. By cooling the lake using the heat of the object to be cooled, the energy efficiency of the whole factory can be improved and the production cost can be reduced. Further, by cooling the lake using the thermoelectric conversion element, it is possible to reduce the size of the cooling floor facility and to reduce the introduction cost.

第３発明においては、冷却対象物をレイクに載せて放冷する冷却床において、レイクに熱電変換素子を取付けたことにより、冷却対象物及び熱電変換素子はレイクと接触しているため、レイクの熱伝導により、効率的に冷却対象物から熱電変換素子へ熱を伝達することができる。   In the third invention, in the cooling floor in which the object to be cooled is placed on the lake and allowed to cool, by attaching the thermoelectric conversion element to the lake, the object to be cooled and the thermoelectric conversion element are in contact with the lake. By heat conduction, heat can be efficiently transferred from the object to be cooled to the thermoelectric conversion element.

第１、第３発明によれば、レイクの熱伝導により、効率的に冷却対象物から熱電変換素子へ熱が伝達される。そのため、冷却対象物の熱エネルギーを効率的に電気エネルギーに変換することができる。   According to the first and third inventions, heat is efficiently transferred from the object to be cooled to the thermoelectric conversion element by the heat conduction of the lake. Therefore, the thermal energy of the cooling object can be efficiently converted into electric energy.

第２発明によれば、冷却床の冷却を効率良く行うことができる。また、冷却床設備の小型化が可能となり、導入コストを削減することができる。   According to the second invention, the cooling bed can be efficiently cooled. In addition, the cooling floor facility can be downsized, and the introduction cost can be reduced.

以下、本発明をその実施の形態を示す図面に基づいて具体的に説明する。
図１（ａ）は本発明に係る冷却床のレイクの要部拡大図であり、図１（ｂ）は図１（ａ）のＢ−Ｂ線切断断面図である。レイク２には、耐熱ケーブル１０が接続されている熱電変換素子８が取付けられている。また、熱電変換素子８にはフィン９が取付けられている。さらに、フィン９を冷却するように散水パイプ６が配置されている。 Hereinafter, the present invention will be specifically described with reference to the drawings illustrating embodiments thereof.
FIG. 1A is an enlarged view of a main part of a cooling bed rake according to the present invention, and FIG. 1B is a cross-sectional view taken along line BB in FIG. The rake 2 is attached with a thermoelectric conversion element 8 to which a heat resistant cable 10 is connected. Further, fins 9 are attached to the thermoelectric conversion element 8. Furthermore, the watering pipe 6 is arrange | positioned so that the fin 9 may be cooled.

図２は熱電変換素子８の取付部分の模式図である。熱電変換素子８は、例えばＰ型とＮ型の半導体を接合したものであり、レイク２側（高温側）とフィン９側（低温側）との温度差により発電を行う。発電された電力は耐熱ケーブル１０から出力される。なお、冷却床１全体の構成は従来（図６）とほぼ同様であり、材料受溝５が設けられた本発明の２つのレイク２、２の一方又は両方を駆動装置４によって円運動又は楕円運動させ、レイク２、２に載せられた熱間材料３の移送を行う。   FIG. 2 is a schematic view of a mounting portion of the thermoelectric conversion element 8. The thermoelectric conversion element 8 is formed by joining, for example, a P-type semiconductor and an N-type semiconductor, and generates power by a temperature difference between the rake 2 side (high temperature side) and the fin 9 side (low temperature side). The generated power is output from the heat resistant cable 10. The entire structure of the cooling bed 1 is substantially the same as the conventional one (FIG. 6), and one or both of the two lakes 2, 2 of the present invention provided with the material receiving groove 5 are moved circularly or elliptically by the driving device 4. The hot material 3 placed on the lakes 2 and 2 is transferred.

図１の白塗矢印で示すように熱間材料３は熱量を放散しており、レイク２に載せられている熱間材料３は材料受溝５と接触しているため、熱が熱間材料３から直接レイク２へ伝わる。レイク２に伝わった熱は、レイク２の熱伝導により熱電変換素子８に伝わり、電力に変換される。このとき、レイク２の熱伝導によって、熱間材料３から熱電変換素子８へ効率良く熱が伝導される。また、フィン９により、熱電変換素子８の低温側は効率良く冷却される。さらに、散水パイプ６でフィン９を水冷するため、熱電変換素子８の低温側は更に効率良く冷却される。   As indicated by the white arrow in FIG. 1, the hot material 3 dissipates heat, and the hot material 3 placed on the rake 2 is in contact with the material receiving groove 5, so that the heat is hot material. Directly from 3 to Lake 2. The heat transferred to the rake 2 is transferred to the thermoelectric conversion element 8 by the heat conduction of the rake 2 and converted into electric power. At this time, heat is efficiently conducted from the hot material 3 to the thermoelectric conversion element 8 by the heat conduction of the lake 2. Moreover, the low temperature side of the thermoelectric conversion element 8 is efficiently cooled by the fins 9. Furthermore, since the fins 9 are water-cooled by the water spray pipe 6, the low temperature side of the thermoelectric conversion element 8 is further efficiently cooled.

耐熱ケーブル１０から出力された電力は、任意の用途に使用可能である。例えば空冷用ファンに電力を供給して、冷却床を空冷することが可能である。また、耐熱ケーブル１０から出力された電力を蓄電することも勿論可能である。   The power output from the heat-resistant cable 10 can be used for any application. For example, the cooling floor can be air-cooled by supplying electric power to the air-cooling fan. It is of course possible to store the electric power output from the heat-resistant cable 10.

また、熱電変換素子は、高温側と低温側との温度差に応じて発電するだけでなく、外部から電流を供給することにより、吸熱側（低温側）と放熱側（高温側）とに温度差を生じさせることもでき、レイク２の冷却に用いることが可能である。   In addition, the thermoelectric conversion element not only generates electricity according to the temperature difference between the high temperature side and the low temperature side, but also supplies current from the outside, so that the temperature is increased on the heat absorption side (low temperature side) and the heat dissipation side (high temperature side). A difference can also be made and can be used to cool the rake 2.

図３は熱電変換素子を冷却にも用いた本発明に係る冷却床のレイクの要部拡大図である。レイク２には、熱電変換素子８が取付けられているが、熱伝変換素子８を用いて発電を行う発電ブロック１１と、熱電変換素子８を用いて冷却を行う冷却ブロック１２とに分けられている。また、発電ブロック１１から冷却ブロック１２へ電流が流れるように、各熱変換素子８の耐熱ケーブル１０の接続が行われている。   FIG. 3 is an enlarged view of a main part of the rake of the cooling bed according to the present invention in which the thermoelectric conversion element is also used for cooling. The lake 2 is provided with a thermoelectric conversion element 8, which is divided into a power generation block 11 that generates power using the thermoelectric conversion element 8 and a cooling block 12 that performs cooling using the thermoelectric conversion element 8. Yes. Further, the heat-resistant cables 10 of the respective heat conversion elements 8 are connected so that a current flows from the power generation block 11 to the cooling block 12.

発電ブロック１１の熱電変換素子８は、図２に示したようにレイク２側（高温側）とフィン９側（低温側）との温度差により発電し、耐熱ケーブル１０から外部負荷である冷却ブロック１２へ電流が供給される。図４は、冷却ブロック１２側の熱電変換素子８の取付部分の模式図である。電源である発電ブロック１１から熱電変換素子８へ電流が流れることにより、レイク２側（吸熱側）とフィン９側（放熱側）とに温度差が生じ、レイク２が熱間材料３から受けた熱が吸熱され、フィン９から放熱される。これにより、レイク２の冷却を効率良く行うことができる。   As shown in FIG. 2, the thermoelectric conversion element 8 of the power generation block 11 generates power by the temperature difference between the rake 2 side (high temperature side) and the fin 9 side (low temperature side), and is a cooling block that is an external load from the heat-resistant cable 10. 12 is supplied with current. FIG. 4 is a schematic diagram of a mounting portion of the thermoelectric conversion element 8 on the cooling block 12 side. When a current flows from the power generation block 11 serving as a power source to the thermoelectric conversion element 8, a temperature difference occurs between the rake 2 side (heat absorption side) and the fin 9 side (heat dissipation side), and the rake 2 receives from the hot material 3. The heat is absorbed and radiated from the fins 9. Thereby, the rake 2 can be cooled efficiently.

上述した各実施の形態においては、フィン９及び散水パイプ６を用いて熱電変換素子８の冷却を行っているが、水冷ジャケットを用いることも可能である。図５（ａ）は水冷ジャケットを用いた本発明に係る冷却床のレイクの要部拡大図であり、図５（ｂ）は図５（ａ）のＣ−Ｃ線切断断面図である。熱電変換素子８には水冷ジャケット１３が取付けられており、水冷ジャケット１３には給排水用の水冷配管１４が取付られている。   In each embodiment mentioned above, although the thermoelectric conversion element 8 is cooled using the fin 9 and the water sprinkling pipe 6, a water cooling jacket can also be used. FIG. 5A is an enlarged view of the main part of the rake of the cooling bed according to the present invention using a water-cooling jacket, and FIG. 5B is a cross-sectional view taken along the line C-C in FIG. A water cooling jacket 13 is attached to the thermoelectric conversion element 8, and a water cooling pipe 14 for water supply and drainage is attached to the water cooling jacket 13.

本発明に係る冷却床のレイクの要部拡大図である。It is a principal part enlarged view of the lake of the cooling floor which concerns on this invention. 熱電変換素子の取付部分の模式図である。It is a schematic diagram of the attachment part of a thermoelectric conversion element. 熱電変換素子を冷却にも用いた本発明に係る冷却床のレイクの要部拡大図である。It is a principal part enlarged view of the lake of the cooling bed which concerns on this invention which used the thermoelectric conversion element also for cooling. 冷却ブロック側の熱電変換素子の取付部分の模式図である。It is a schematic diagram of the attachment part of the thermoelectric conversion element by the side of a cooling block. 水冷ジャケットを用いた本発明に係る冷却床のレイクの要部拡大図である。It is a principal part enlarged view of the lake of the cooling floor which concerns on this invention using a water cooling jacket. 冷却床の例を示す模式図である。It is a schematic diagram which shows the example of a cooling floor. 冷却床の従来のレイクの要部拡大図である。It is a principal part enlarged view of the conventional lake of a cooling floor.

符号の説明Explanation of symbols

１ 冷却床
２ レイク
３ 熱間材料
４ 駆動装置
５ 材料受溝
６ 散水パイプ
８ 熱電変換素子
９ フィン
１０ 耐熱ケーブル
１１ 発電ブロック
１２ 冷却ブロック
１３ 水冷ジャケット
１４ 水冷配管 DESCRIPTION OF SYMBOLS 1 Cooling floor 2 Lake 3 Hot material 4 Drive device 5 Material receiving groove 6 Sprinkling pipe 8 Thermoelectric conversion element 9 Fin 10 Heat-resistant cable 11 Power generation block 12 Cooling block 13 Water cooling jacket 14 Water cooling piping

Claims (3)

冷却対象物をレイクに載せて放冷する冷却床での廃熱回収方法において、
前記レイクの熱伝導により、冷却対象物から該レイクに取付けてある熱電変換素子へ熱を伝導し、伝導された熱を電力に変換することを特徴とする廃熱回収方法。 In the waste heat recovery method on the cooling floor where the object to be cooled is placed on the lake and allowed to cool,
A waste heat recovery method, wherein heat is conducted from an object to be cooled to a thermoelectric conversion element attached to the lake by heat conduction of the lake, and the conducted heat is converted into electric power. 変換された電力の一部又は全部を熱電変換素子に供給し、該熱電変換素子で前記レイクを冷却することを特徴とする請求項１記載の廃熱回収方法。   The waste heat recovery method according to claim 1, wherein a part or all of the converted electric power is supplied to a thermoelectric conversion element, and the rake is cooled by the thermoelectric conversion element. 冷却対象物をレイクに載せて放冷する冷却床において、
前記レイクには熱電変換素子が取付けられていることを特徴とする冷却床。 In the cooling floor where the object to be cooled is placed on the lake and allowed to cool,
A cooling bed, wherein a thermoelectric conversion element is attached to the lake.
JP2005086491A 2005-03-24 2005-03-24 Waste heat recovery method and cooling bed Expired - Fee Related JP4367362B2 (en)

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JP5568271B2 (en) * 2009-09-17 2014-08-06 東芝三菱電機産業システム株式会社 Heat recovery equipment
KR101686034B1 (en) 2012-09-27 2016-12-13 제이에프이 스틸 가부시키가이샤 Manufacturing facility line and thermoelectric power generation method
JP5958547B2 (en) 2012-09-27 2016-08-02 Ｊｆｅスチール株式会社 Manufacturing equipment column and thermoelectric power generation method
JP5989605B2 (en) * 2013-06-25 2016-09-07 中国電力株式会社 LNG cold energy generator
JP7102954B2 (en) * 2018-06-01 2022-07-20 富士通オプティカルコンポーネンツ株式会社 Optical transmission device and control method

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