JP2006038336A - High temperature heat exchanger - Google Patents

High temperature heat exchanger Download PDF

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JP2006038336A
JP2006038336A JP2004218298A JP2004218298A JP2006038336A JP 2006038336 A JP2006038336 A JP 2006038336A JP 2004218298 A JP2004218298 A JP 2004218298A JP 2004218298 A JP2004218298 A JP 2004218298A JP 2006038336 A JP2006038336 A JP 2006038336A
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temperature fluid
temperature
heat exchange
heat
heat exchanger
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Kimiaki Nakano
公昭 中野
Satoru Sakuma
哲 佐久間
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T Rad Co Ltd
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T Rad Co Ltd
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Priority to JP2004218298A priority Critical patent/JP2006038336A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To enhance heat exchange efficiency, and to improve durability of a heat transfer tube. <P>SOLUTION: The high temperature heat exchanger 11 is composed so as to carry out heat exchange between a high temperature fluid and a low temperature fluid, and it is provided with a first heat exchange part 12 comprising a round tube 14, and a second heat exchange part 13 comprising a flat tube 15 and fins 16 and 17. It is characterized by that the first heat exchange part 12 is arranged in an upstream side of the high temperature fluid, and the second heat exchange part 13 is arranged in a downstream side of the high temperature fluid. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、2つの流体間において熱交換を行う熱交換器に関し、特に、高温流体と低温流体との間で熱交換を行う高温熱交換器に関する。   The present invention relates to a heat exchanger that exchanges heat between two fluids, and more particularly to a high-temperature heat exchanger that exchanges heat between a high-temperature fluid and a low-temperature fluid.

従来、ガスタービンから排出される高温ガスの排熱を回収する場合や、燃料電池において燃料となる水素を生成する場合等において、高温熱交換器が使用されている。   Conventionally, a high-temperature heat exchanger has been used when recovering exhaust heat of a high-temperature gas discharged from a gas turbine or when generating hydrogen as fuel in a fuel cell.

図4は、この種の高温熱交換器を発電プラントにおいて使用した例を示すものである。この発電プラントは、ガスタービン1と、排気管2を介してこのガスタービン1に接続された排熱回収用の高温熱交換器3と、高温熱交換器3内に設けられた蒸発器4及びエコノマイザ5とを備えている。そして、蒸発器4及びエコノマイザ5は蛇行して形成された伝熱管6,7により構成されており、これらの伝熱管6,7内にはそれぞれ蒸気及び水が流通するようになっている。   FIG. 4 shows an example in which this type of high-temperature heat exchanger is used in a power plant. This power plant includes a gas turbine 1, a high-temperature heat exchanger 3 for exhaust heat recovery connected to the gas turbine 1 via an exhaust pipe 2, an evaporator 4 provided in the high-temperature heat exchanger 3, and The economizer 5 is provided. The evaporator 4 and the economizer 5 are composed of meandering heat transfer tubes 6, 7, and steam and water flow through the heat transfer tubes 6, 7, respectively.

このような構成において、ガスタービン1から排出された高温の排気ガスは、排気管2を介して排熱回収用の高温熱交換器3に送られ、この高温熱交換器3において、各伝熱管6,7内をそれぞれ流通する蒸気及び水と熱交換され、排気ガスの排熱が回収される(例えば、特許文献1参照)。
特開昭58−203303号公報
In such a configuration, the high-temperature exhaust gas discharged from the gas turbine 1 is sent to the high-temperature heat exchanger 3 for exhaust heat recovery via the exhaust pipe 2, and each heat transfer tube in the high-temperature heat exchanger 3. Heat is exchanged with steam and water flowing through the insides of 6 and 7, respectively, and exhaust heat of the exhaust gas is recovered (for example, see Patent Document 1).
JP 58-203303 A

しかしながら、上記した従来の高温熱交換器では、熱交換部が蛇行する伝熱管6,7により構成されていると共に熱交換を行う2つの流体が全体的に同方向に流れるようになっているため、熱交換効率を高めることが難しいといった問題があった。   However, in the conventional high-temperature heat exchanger described above, the heat exchanging portion is constituted by the meandering heat transfer tubes 6 and 7, and the two fluids for heat exchange flow in the same direction as a whole. There was a problem that it was difficult to increase the heat exchange efficiency.

また、伝熱管6,7が高温ガスにより熱膨張し、応力の発生を抑制することが難しいため、伝熱管6,7が劣化し易いといった問題もあった。   Further, since the heat transfer tubes 6 and 7 are thermally expanded by the high-temperature gas and it is difficult to suppress the generation of stress, there is a problem that the heat transfer tubes 6 and 7 are easily deteriorated.

本発明は、上記した課題を解決すべくなされたものであり、熱交換効率を高めることができ、さらに、伝熱管の耐久性を向上させることのできる高温熱交換器を提供しようとするものである。   The present invention has been made to solve the above-described problems, and is intended to provide a high-temperature heat exchanger that can increase heat exchange efficiency and can further improve the durability of a heat transfer tube. is there.

本発明は、高温流体と低温流体との間で熱交換を行うように構成された高温熱交換器11であって、丸チューブ14から成る第1熱交換部12と、扁平チューブ15とフィン16,17とから成る第2熱交換部13とを備えており、第1熱交換部12は前記高温流体の上流側に配置され、第2熱交換部13は前記高温流体の下流側に配置されていることを特徴とする。   The present invention is a high-temperature heat exchanger 11 configured to exchange heat between a high-temperature fluid and a low-temperature fluid, and includes a first heat exchange unit 12 including a round tube 14, a flat tube 15, and fins 16. , 17 and the second heat exchanging unit 13, the first heat exchanging unit 12 is arranged on the upstream side of the high temperature fluid, and the second heat exchanging unit 13 is arranged on the downstream side of the high temperature fluid. It is characterized by.

そして、好ましくは、前記低温流体はチューブ14,15内を流通し、前記高温流体はチューブ14,15の外側を流通し、前記低温流体と前記高温流体とは全体的に直交且つ対向して流通するように構成されているのがよい。   Preferably, the low-temperature fluid flows through the tubes 14 and 15, the high-temperature fluid flows outside the tubes 14 and 15, and the low-temperature fluid and the high-temperature fluid are generally orthogonal and opposed to each other. It is good to be configured to do so.

また、第1熱交換部12の丸チューブ14には耐高温酸化材料が使用されているのがよい。   Further, it is preferable that a high temperature oxidation resistant material is used for the round tube 14 of the first heat exchange unit 12.

本発明によれば、低温流体と高温流体の温度差の小さい高温流体の下流側に伝熱効率の高い第2熱交換部が配置され、両流体の温度差の大きい高温流体の上流側に流体抵抗の小さい第1熱交換部が配置されているため、熱交換効率と流体抵抗とのバランスが改善され、全体として効率の良い高温熱交換器を提供することができる。   According to the present invention, the second heat exchanging portion having a high heat transfer efficiency is disposed downstream of the high temperature fluid having a small temperature difference between the low temperature fluid and the high temperature fluid, and the fluid resistance is disposed upstream of the high temperature fluid having a large temperature difference between the two fluids. Since the 1st heat exchange part with small is arrange | positioned, the balance of heat exchange efficiency and fluid resistance is improved, and it can provide an efficient high temperature heat exchanger as a whole.

また、低温流体と高温流体とが全体的に直交且つ対向して流れるように構成されている場合には、熱交換効率をさらに高めることができる。   Further, when the low-temperature fluid and the high-temperature fluid are configured to flow generally orthogonally and oppositely, the heat exchange efficiency can be further increased.

さらに、第1熱交換部の丸チューブに耐高温酸化材料が使用されている場合には、温度変化による劣化を防止することができ、耐久性の向上を図ることができる等、種々の優れた効果を得ることができる。   Furthermore, when a high-temperature oxidation resistant material is used for the round tube of the first heat exchange part, it is possible to prevent deterioration due to temperature change, and to improve durability, and so on. An effect can be obtained.

以下、図面を参照しつつ、本発明の実施の形態について説明する。ここで、図1は本発明の実施の形態に係る高温熱交換器を示す分解斜視図、図2はその第2熱交換部を示す斜視図、図3は高温熱交換器の作用を示す概略説明図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, FIG. 1 is an exploded perspective view showing a high temperature heat exchanger according to an embodiment of the present invention, FIG. 2 is a perspective view showing a second heat exchange portion thereof, and FIG. 3 is a schematic view showing an operation of the high temperature heat exchanger. It is explanatory drawing.

この高温熱交換器11は、第1熱交換部12と第2熱交換部13の2つの熱交換部を備えている。第1熱交換部12はU字状に屈曲された複数の丸チューブ14により構成されており、丸チューブ14には耐高温酸化材料が使用されている。また、第2熱交換部13は複数並設された扁平チューブ15と、扁平チューブ15内に挿入された波形インナーフィン16と、各扁平チューブ15間に介装されたコルゲートオフセットフィン17とから構成されており、扁平チューブ15には一般的な低コスト材料、例えば、ステンレス鋼(SUS316,304)が使用されている。そして、丸チューブ14及び扁平チューブ15の内部を低温流体が流通し、その低温流体と全体的に直交且つ対向するように高温流体が丸チューブ14及び扁平チューブ15の外側を流通するようになっており、第1熱交換部12は高温流体の上流側に配置され、第2熱交換部13は高温流体の下流側に配置されている。   The high-temperature heat exchanger 11 includes two heat exchange units, a first heat exchange unit 12 and a second heat exchange unit 13. The first heat exchanging portion 12 is composed of a plurality of round tubes 14 bent in a U shape, and the round tube 14 is made of a high temperature oxidation resistant material. The second heat exchanging unit 13 includes a plurality of flat tubes 15, corrugated inner fins 16 inserted into the flat tubes 15, and corrugated offset fins 17 interposed between the flat tubes 15. The flat tube 15 is made of a general low-cost material such as stainless steel (SUS316, 304). And a low temperature fluid distribute | circulates the inside of the round tube 14 and the flat tube 15, and a high temperature fluid distribute | circulates the outer side of the round tube 14 and the flat tube 15 so that it may orthogonally cross and oppose the low temperature fluid entirely. The first heat exchange unit 12 is disposed on the upstream side of the high temperature fluid, and the second heat exchange unit 13 is disposed on the downstream side of the high temperature fluid.

また、高温熱交換器11には、第1熱交換部12及び第2熱交換部13の両端側にそれぞれ上流側ヘッダ部材18及び下流側ヘッダ部材19が設けられていると共に、第1熱交換部12及び第2熱交換部13の両側にそれぞれサイドカバー20,21が設けられている。   Further, the high-temperature heat exchanger 11 is provided with an upstream header member 18 and a downstream header member 19 on both ends of the first heat exchange unit 12 and the second heat exchange unit 13, respectively, and the first heat exchange unit Side covers 20 and 21 are provided on both sides of the section 12 and the second heat exchange section 13, respectively.

上流側ヘッダ部材18は、扁平チューブ15の上流側端部22が貫設される上流側ヘッダプレート23と、上流側ヘッダプレート23に取り付けられる箱状のヘッダ本体部24と、ヘッダ本体部24に取り付けられる低温流体取入れ部25とから構成されている。一方、下流側ヘッダ部材19は、扁平チューブ15の下流側端部27と丸チューブ14の上流側端部28及び下流側端部29が貫設される下流側ヘッダプレート30と、扁平チューブ15の下流側端部27と丸チューブ14の上流側端部28とを連通させるように下流側ヘッダプレート30に取り付けられる第1ヘッダ本体部31と、下流側ヘッダプレート30の丸チューブ14の下流側端部29側に取り付けられる第2ヘッダ本体部32と、第2ヘッダ本体部32に取り付けられる低温流体排出部33とから構成されている。   The upstream header member 18 includes an upstream header plate 23 through which the upstream end 22 of the flat tube 15 penetrates, a box-shaped header main body 24 attached to the upstream header plate 23, and a header main body 24. It is comprised from the cryogenic fluid intake part 25 attached. On the other hand, the downstream header member 19 includes a downstream header plate 30 through which the downstream end 27 of the flat tube 15, the upstream end 28 and the downstream end 29 of the round tube 14, and the flat tube 15. A first header body 31 attached to the downstream header plate 30 so as to communicate the downstream end 27 and the upstream end 28 of the round tube 14, and the downstream end of the round tube 14 of the downstream header plate 30 The second header main body portion 32 attached to the portion 29 side and the low-temperature fluid discharge portion 33 attached to the second header main body portion 32 are configured.

サイドカバー20,21はそれぞれ、板状部材の上下端部をそれぞれ内側に折曲させた形状を成しており、第1熱交換部12及び第2熱交換部13の各側面を覆うように形成されている。そして、サイドカバー20,21は、自由に熱膨張又は熱収縮可能なように、一端のみが固定され、他端はフリーになっている。   Each of the side covers 20 and 21 has a shape in which the upper and lower ends of the plate-like member are bent inward so as to cover the side surfaces of the first heat exchange unit 12 and the second heat exchange unit 13. Is formed. The side covers 20 and 21 are fixed only at one end and free at the other end so that they can freely expand or contract.

次に、主に、図3を参照しつつ、高温熱交換器11における作用について説明する。   Next, the operation in the high-temperature heat exchanger 11 will be described mainly with reference to FIG.

低温流体は、低温流体取入れ部25からヘッダ本体部24を通って、第2熱交換部12の扁平チューブ15内に流入し、下流側ヘッダ部材19の第1ヘッダ本体部31を通って、第1熱交換部13の丸チューブ14内に流入する。そして、丸チューブ14内に流入した低温流体は、丸チューブ14の形状に沿って折り返し、下流側ヘッダ部材19の第2ヘッダ本体部32を通って低温流体排出部32から外部に排出される。   The low-temperature fluid flows from the low-temperature fluid intake portion 25 through the header main body portion 24 into the flat tube 15 of the second heat exchange portion 12, passes through the first header main body portion 31 of the downstream header member 19, 1 flows into the round tube 14 of the heat exchange unit 13. The low-temperature fluid that has flowed into the round tube 14 is folded back along the shape of the round tube 14, passes through the second header main body portion 32 of the downstream header member 19, and is discharged to the outside from the low-temperature fluid discharge portion 32.

一方、高温流体は、全体的に低温流体の流れの方向と直交且つ対向する向き(図3では下から上方の向き)に、第1熱交換部12の丸チューブ14の外側を流通した後、第2熱交換部13の扁平チューブ15の外側を流通する。そして、その高温流体と丸チューブ14及び扁平チューブ15内を流通する低温流体との間で熱交換が行われる。この時、熱により丸チューブ14は伸長するが、丸チューブ14は下流側ヘッダプレート30にのみ固定されており、曲がり部によってその伸びを吸収し、熱応力を緩和することができるため、丸チューブ14の上流側及び下流側端部28,29と下流側ヘッダプレート30との接合箇所に負荷が掛かることはない。したがって、耐久性の向上を図ることができる。   On the other hand, after the high-temperature fluid circulates outside the round tube 14 of the first heat exchange unit 12 in a direction that is generally orthogonal to and opposite to the flow direction of the low-temperature fluid (from the bottom to the top in FIG. 3), The outside of the flat tube 15 of the 2nd heat exchange part 13 distribute | circulates. Then, heat exchange is performed between the high temperature fluid and the low temperature fluid circulating in the round tube 14 and the flat tube 15. At this time, the round tube 14 expands due to heat, but the round tube 14 is fixed only to the downstream header plate 30 and can absorb the elongation by the bent portion, so that thermal stress can be relieved. No load is applied to the joint between the upstream and downstream end portions 28 and 29 of the 14 and the downstream header plate 30. Therefore, durability can be improved.

このように、本発明の実施の形態によれば、低温流体と高温流体の温度差の小さい高温流体の下流側に伝熱効率の高い第2熱交換部13が配置され、両流体の温度差の大きい高温流体の上流側に流体抵抗の小さい第1熱交換部12が配置されているため、熱交換効率と流体抵抗とのバランスが改善され、全体として効率の良い高温熱交換器を提供することができる。また、低温流体と高温流体とは直交且つ対向して流れるように構成されているため、熱交換効率をさらに高めることができる。さらに、第1熱交換部12の丸チューブ14には耐高温酸化材料が使用されているため、温度変化による劣化を防止することができ、耐久性の向上を図ることができると共に、第2熱交換部13の扁平チューブ15には低コスト材料が使用されているため、製造コストの低減化を図ることもできる。   As described above, according to the embodiment of the present invention, the second heat exchange unit 13 with high heat transfer efficiency is disposed on the downstream side of the high-temperature fluid having a small temperature difference between the low-temperature fluid and the high-temperature fluid. Since the first heat exchanging portion 12 having a low fluid resistance is arranged upstream of a large high-temperature fluid, the balance between the heat exchange efficiency and the fluid resistance is improved, and an overall high-efficiency high-temperature heat exchanger is provided. Can do. Further, since the low-temperature fluid and the high-temperature fluid are configured to flow orthogonally and oppositely, the heat exchange efficiency can be further increased. Furthermore, since the high-temperature oxidation-resistant material is used for the round tube 14 of the first heat exchange unit 12, deterioration due to temperature change can be prevented, durability can be improved, and the second heat Since a low cost material is used for the flat tube 15 of the exchange part 13, manufacturing cost can also be reduced.

本発明の実施の形態に係る高温熱交換器を示す分解斜視図である。It is a disassembled perspective view which shows the high temperature heat exchanger which concerns on embodiment of this invention. 本発明の実施の形態に係る高温熱交換器の熱交換部を示す斜視図である。It is a perspective view which shows the heat exchange part of the high temperature heat exchanger which concerns on embodiment of this invention. 本発明の実施の形態に係る高温熱交換器を示す概略説明図である。It is a schematic explanatory drawing which shows the high temperature heat exchanger which concerns on embodiment of this invention. 従来例を示す系統図である。It is a systematic diagram which shows a prior art example.

符号の説明Explanation of symbols

11 高温熱交換器
12 第1熱交換部
13 第2熱交換部
14 丸チューブ
15 扁平チューブ
16 波形インナーフィン
17 コルゲートオフセットフィン
DESCRIPTION OF SYMBOLS 11 High temperature heat exchanger 12 1st heat exchange part 13 2nd heat exchange part 14 Round tube 15 Flat tube 16 Corrugated inner fin 17 Corrugated offset fin

Claims (3)

高温流体と低温流体との間で熱交換を行うように構成された高温熱交換器であって、
丸チューブから成る第1熱交換部と、扁平チューブとフィンとから成る第2熱交換部とを備えており、前記第1熱交換部は前記高温流体の上流側に配置され、前記第2熱交換部は前記高温流体の下流側に配置されていることを特徴とする高温熱交換器。
A high temperature heat exchanger configured to exchange heat between a high temperature fluid and a low temperature fluid,
A first heat exchanging portion made of a round tube, and a second heat exchanging portion made of a flat tube and fins, the first heat exchanging portion being arranged upstream of the high-temperature fluid, and the second heat exchanging portion. The high-temperature heat exchanger, wherein the exchange unit is arranged on the downstream side of the high-temperature fluid.
前記低温流体は前記チューブ内を流通し、前記高温流体は前記チューブの外側を流通し、前記低温流体と前記高温流体とは全体的に直交且つ対向して流通するように構成されている請求項1に記載の高温熱交換器。 The low-temperature fluid flows through the tube, the high-temperature fluid flows through the outside of the tube, and the low-temperature fluid and the high-temperature fluid are arranged so as to flow generally orthogonally and oppositely. The high temperature heat exchanger according to 1. 前記第1熱交換部の丸チューブには耐高温酸化材料が使用されている請求項1又は2に記載の高温熱交換器。 The high temperature heat exchanger according to claim 1 or 2, wherein a high temperature oxidation resistant material is used for the round tube of the first heat exchange section.
JP2004218298A 2004-07-27 2004-07-27 High temperature heat exchanger Pending JP2006038336A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011021884A (en) * 2010-11-05 2011-02-03 Mitsubishi Electric Corp Air conditioner
WO2011043563A2 (en) * 2009-10-07 2011-04-14 주식회사 경동나비엔 Heat exchanger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011043563A2 (en) * 2009-10-07 2011-04-14 주식회사 경동나비엔 Heat exchanger
WO2011043563A3 (en) * 2009-10-07 2011-09-09 주식회사 경동나비엔 Heat exchanger
JP2011021884A (en) * 2010-11-05 2011-02-03 Mitsubishi Electric Corp Air conditioner

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