JP5883168B1

JP5883168B1 - Multi-coil heat exchanger

Info

Publication number: JP5883168B1
Application number: JP2015012629A
Authority: JP
Inventors: 中島　竜一; 竜一中島
Original assignee: ニッシンコーポレーション株式会社
Priority date: 2015-01-26
Filing date: 2015-01-26
Publication date: 2016-03-09
Anticipated expiration: 2035-01-26
Also published as: JP2016138680A

Abstract

【課題】液体を処理対象とする多重コイル型熱交換器として、熱交換効率が高く、被処理液量が多くなっても連続的処理を行うことができ、従来に比較して設備コスト及び稼働コストを著しく低減できるものを提供する。【解決手段】熱交換槽１内に、溢流排出筒２とこれを取囲む中間筒３とを備え、中間筒３の外側の環状空間１０内に、冷却水Ｃを通す複数本の伝熱管４が多重コイル状に巻回して主熱交換部Ｈ１を形成し、中間筒３の下端側に液流通部１０ａを有する。溢流排出筒２は、上端側に溢流口２ａを有し、下端側が熱交換槽１の被処理液出口６に連通する。環状空間１０の上部に臨んで冷却水出口ヘッダー８と被処理液入口５が設けられ、中間筒３内の上部に臨んで冷却水入口ヘッダー７が設けられる。伝熱管４は、主熱交換部Ｈ１の上部から冷却水出口ヘッダー８に接続し、主熱交換部Ｈ１の下部から液流通部１０ａ及び中間筒３の内側を通って冷却水入口ヘッダー７に接続し、中間筒３の内側で副熱交換部Ｈ２を形成する。【選択図】図１As a multi-coil heat exchanger for treating liquids, heat exchange efficiency is high, and continuous treatment can be performed even when the amount of liquid to be treated is increased. Provide one that can significantly reduce costs. A heat exchange tank (1) includes an overflow discharge tube (2) and an intermediate tube (3) surrounding the overflow discharge tube (2), and a plurality of heat transfer tubes through which cooling water (C) passes through an annular space (10) outside the intermediate tube (3). 4 is wound in a multi-coil shape to form a main heat exchanging portion H1, and a liquid circulation portion 10a is provided on the lower end side of the intermediate tube 3. The overflow discharge cylinder 2 has an overflow port 2 a on the upper end side, and the lower end side communicates with the liquid outlet 6 to be treated of the heat exchange tank 1. The coolant outlet header 8 and the liquid inlet 5 to be treated are provided facing the upper portion of the annular space 10, and the coolant inlet header 7 is provided facing the upper portion of the intermediate cylinder 3. The heat transfer tube 4 is connected to the cooling water outlet header 8 from the upper part of the main heat exchanging part H1, and is connected to the cooling water inlet header 7 from the lower part of the main heat exchanging part H1 through the inside of the liquid circulation part 10a and the intermediate cylinder 3. Then, the auxiliary heat exchange part H <b> 2 is formed inside the intermediate cylinder 3. [Selection] Figure 1

Description

本発明は、被処理液を収容する熱交換槽内に、熱交換媒体を通す複数本の伝熱管が多重コイル状に巻回された熱交換部を有する多重コイル型熱交換器に関する。 The present invention relates to a multi-coil heat exchanger having a heat exchange section in which a plurality of heat transfer tubes through which a heat exchange medium is passed are wound in a multi-coil shape in a heat exchange tank containing a liquid to be treated.

熱交換器として、熱交換する流体の種類と組合わせ、用途、処理量、要求される熱交換効率、処理ラインや装置部への組付け形態等に応じ、極めて多種多様な形式及び構造のものが存在する。これらの内、コイル型熱交換器は、熱交換媒体を通す伝熱管がコイル状に巻回されたものであり、被処理流体を流通又は収容する容器内に組み込んだ形でシェル＆コイル式熱交換器と称される。ここでは、特に熱交換効率を高めるために複数本の伝熱管を多重コイル状に巻回したものを多重コイル型熱交換器という。 As heat exchangers, there are a wide variety of types and structures depending on the type and combination of fluids to be heat exchanged, application, throughput, required heat exchange efficiency, and the form of assembly in the treatment line and equipment. Exists. Of these, the coil-type heat exchanger is a coil in which a heat transfer tube that passes a heat exchange medium is wound in a coil shape, and is incorporated in a container that circulates or accommodates a fluid to be treated. It is called an exchanger. Here, in particular, a multi-coil heat exchanger is formed by winding a plurality of heat transfer tubes in a multi-coil shape in order to increase the heat exchange efficiency.

一般的に、多重コイル型熱交換器は、構造的に簡素であり、大きな熱交換処理量に対応して大型化し易いという利点があるが、その熱交換部の構造上、伝熱管の多重巻回部の中央側に大きな空間を生じる（例えば、特許文献１〜３）。このような中央側の空間は、熱交換器の用途によっては種々の機能要素の配設に利用することもあるが、多くの場合は熱交換に寄与しないデッドスペースとなり、その存在によって熱交換効率が低下することになる。 In general, a multi-coil heat exchanger is simple in structure and has an advantage that it can be easily increased in size in response to a large amount of heat exchange. However, due to the structure of the heat exchange section, multiple windings of heat transfer tubes are used. A large space is generated on the center side of the turning part (for example, Patent Documents 1 to 3). Such a space on the center side may be used for disposing various functional elements depending on the application of the heat exchanger, but in many cases, it becomes a dead space that does not contribute to heat exchange, and its presence makes it possible to improve heat exchange efficiency. Will drop.

図５は、例えば半導体ウエハ、電子部品用のガラス基板、各種金属資材等の酸洗浄工程から排出される高温の酸廃水を対象として、その熱エネルギーを回収したり、後段の廃水処理や循環再利用のために低温化するのに用いる多重コイル型熱交換器を示す。この多重コイル型熱交換器は、略縦円筒状の熱交換槽２１内に、ＰＦＡ（パーフルオロアルコキシエチレン樹脂）チューブからなる複数本の伝熱管２２を多孔板２３に通して多重に巻回した熱交換コイル部２４が配置しており、該熱交換槽２１の蓋板２１ａには中央部の廃水入口２５と径方向両側の冷却水入口ヘッダー２６及び出口ヘッダー２７を備えると共に、該熱交換槽２１の底部中央に廃水出口２８が設けてある。各伝熱管２２は、冷却水入口ヘッダー２６から導出して熱交換槽２１の中央部を垂下し、熱交換コイル部２４の下側に繋がり、該熱交換コイル部２４の上側から冷却水出口ヘッダー２７に接続しており、冷却水入口ヘッダー２６からの垂下部分２２ａを断熱のために二重構造にしている。また、熱交換コイル部２４の中央側の空間の上下位置には、廃水入口２５から流入した酸廃水Ｌが直接に廃水出口２８の方へ向かうのを防ぐために、バッフル板２９が水平に配置されており、これらバッフル板２９を各伝熱管２２が貫通している。なお、廃水出口２８は外部に配管されて上方へ向かう導出管路３１に接続され、該導出管路３１は上部で水平方向の溢流管３２とエアー抜き管３３とに分岐すると共に、下部には開閉バルブＶ付きのドレン管３４が接続している。 FIG. 5 shows, for example, the recovery of thermal energy from a high-temperature acid wastewater discharged from an acid cleaning process such as a semiconductor wafer, a glass substrate for electronic parts, and various metal materials, and the subsequent wastewater treatment and circulation recycling. A multi-coil heat exchanger used for lowering the temperature for use is shown. In this multi-coil heat exchanger, a plurality of heat transfer tubes 22 each made of a PFA (perfluoroalkoxyethylene resin) tube are wound in a multiple manner through a perforated plate 23 in a heat exchange tank 21 having a substantially vertical cylindrical shape. A heat exchanging coil section 24 is arranged, and the cover plate 21a of the heat exchanging tank 21 is provided with a waste water inlet 25 in the center, cooling water inlet headers 26 and outlet headers 27 on both sides in the radial direction, and the heat exchanging tank. A waste water outlet 28 is provided in the center of the bottom of 21. Each heat transfer tube 22 is led out from the cooling water inlet header 26 and hangs down from the central portion of the heat exchange tank 21, and is connected to the lower side of the heat exchange coil portion 24, and from the upper side of the heat exchange coil portion 24 to the cooling water outlet header. 27, and the hanging portion 22a from the cooling water inlet header 26 has a double structure for heat insulation. In addition, a baffle plate 29 is horizontally disposed at the upper and lower positions of the space on the center side of the heat exchange coil section 24 in order to prevent the acid waste water L flowing from the waste water inlet 25 from going directly to the waste water outlet 28. Each heat transfer tube 22 passes through these baffle plates 29. The waste water outlet 28 is connected to an outlet pipe 31 that is piped to the outside and goes upward. The outlet pipe 31 branches into an overflow pipe 32 and an air vent pipe 33 in the horizontal direction at the upper part, and at the lower part. Is connected to a drain pipe 34 with an open / close valve V.

この多重コイル型熱交換器では、廃水入口２５より導入した７０℃前後の酸廃水Ｌを伝熱管２２に通した２０℃以下の冷却水Ｃと熱交換し、３０℃前後まで降温させて廃水出口２８より導出管路３１を経て溢流管３２からオーバーフローさせて導出するが、熱交換効率が低いことから、連続的処理では廃水導入速度（時間当り導入量）を低く抑える必要がある。一方、酸洗浄工程からの酸廃水排出量は多いため、実機操業では、排出ラインに複数基（通常は２基）の多重コイル型熱交換器を並列に設置し、一つの熱交換器に導入される酸廃水Ｌが満杯になるまで導出を停止し、満杯になった時点で待機している別の熱交換器に導入を切換え、この別の熱交換器に導入している間に、先の熱交換器に導入した酸廃水Ｌを設定温度まで降温させ、その全量導出によって該熱交換器を空にして待機させ、同様にして次の導入切換えを行う、というバッジ式の熱交換システムが採用されている。 In this multi-coil heat exchanger, the acid waste water L of about 70 ° C. introduced from the waste water inlet 25 is heat-exchanged with the cooling water C of 20 ° C. or less passed through the heat transfer tube 22, and the temperature is lowered to about 30 ° C. However, since the heat exchange efficiency is low, it is necessary to keep the wastewater introduction speed (introduced amount per hour) low in continuous processing. On the other hand, since acid wastewater discharged from the acid cleaning process is large, in actual equipment operation, multiple (usually two) multiple coil heat exchangers are installed in parallel on the discharge line and introduced into one heat exchanger. The derivation is stopped until the acid waste water L to be filled is full, and the introduction is switched to another heat exchanger waiting when the acid waste water L is full. The badge-type heat exchange system that lowers the acid waste water L introduced into the heat exchanger to a set temperature, empties the heat exchanger by derivation of the total amount thereof, waits for it, and similarly performs the next introduction switching. It has been adopted.

特開平０８−５４１９２号公報Japanese Patent Laid-Open No. 08-54192 特開２０１０−８５０３７号公報JP 2010-85037 A 特開２０１３−４０７０６号公報JP 2013-40706 A

しかしながら、前記バッジ式の熱交換システムでは、複数基の多重コイル型熱交換器を用いることに加え、一般的に酸廃水供給量が変動するから、その変動に対応して、熱交換器間での酸廃水導入の切換え、各熱交換器における廃水出口の開閉、冷却水の通水量等をコントロールする必要があり、そのための多くの弁機構や検出・制御機器を用いることになり、設備コスト及び稼働コストが非常に嵩むという問題があった。 However, in the badge-type heat exchange system, in addition to using a plurality of multi-coil heat exchangers, the acid wastewater supply amount generally fluctuates. It is necessary to control the introduction of acid wastewater, the opening and closing of the wastewater outlet in each heat exchanger, the flow rate of cooling water, etc., and many valve mechanisms and detection / control devices for that purpose will be used. There was a problem that the operating cost was very high.

本発明は、上述の事情に鑑みて、液体を処理対象とする多重コイル型熱交換器として、熱交換効率が高く、被処理液量が多くなっても連続的処理を行うことができ、また被処理液の導入量が変動しても各別なコントロールを行う必要がなく、もって従来に比較して設備コスト及び稼働コストを著しく低減できるものを提供することを目的としている。 In view of the above-described circumstances, the present invention is a multi-coil heat exchanger for treating liquid, and has high heat exchange efficiency and can perform continuous treatment even when the amount of liquid to be treated increases. It is an object of the present invention to provide a device capable of significantly reducing the equipment cost and the operating cost as compared with the conventional one, without the need to perform different controls even when the amount of the liquid to be treated varies.

上記目的を達成するための手段を図面の参照符号を付して示せば、請求項１の発明に係る多重コイル型熱交換器は、密閉型の熱交換槽１内に、上下方向に沿う溢流排出筒２と、該溢流排出筒２を同心状に取囲む中間筒３とを備えると共に、この中間筒３の外側の環状空間１０内に、熱交換媒体（冷却水）Ｃを通す複数本の伝熱管４が該中間筒３周りに多重コイル状に巻回して主熱交換部Ｈ１を形成し、中間筒３の下端側に、内側空間３０と外側の環状空間１０とを連通する液流通部１０ａを有し、溢流排出筒２は、上端側に溢流口２ａを備え、下端側が被処理液出口６に連通し、環状空間１０の上部に臨んで熱交換媒体出口（冷却水出口ヘッダー）８と被処理液入口５とが設けられると共に、中間筒３内の上部に臨んで熱交換媒体入口（冷却水入口ヘッダー）７が設けられ、複数本の伝熱管４は、主熱交換部Ｈ１の上部から熱交換媒体出口８に接続すると共に、該主熱交換部Ｈ１の下部から液流通部１０ａ及び中間筒３の内側を通って熱交換媒体入口７に接続して、該中間筒３の内側で副熱交換部Ｈ２を形成し、被処理液入口５から導入された被処理液Ｌが、環状空間１０を下降する過程で、主熱交換部Ｈ１において熱交換媒体Ｃと熱交換し、次いで液流通部１０ａより中間筒３内に入って上昇する過程で、副熱交換部Ｈ２において熱交換媒体Ｃと熱交換したのち、溢流排出筒２の溢流口２ａに流入して被処理液出口６より導出するように構成されている。 If a means for achieving the above object is shown with reference numerals in the drawings, the multi-coil heat exchanger according to the invention of claim 1 overflows in the hermetic heat exchange tank 1 along the vertical direction. A plurality of flow-exchanging cylinders 2 and an intermediate cylinder 3 that concentrically surrounds the overflow-discharge cylinder 2 and a heat exchange medium (cooling water) C is passed through an annular space 10 outside the intermediate cylinder 3. A heat transfer tube 4 is wound around the intermediate cylinder 3 in a multi-coil shape to form a main heat exchanging portion H1, and a liquid communicating the inner space 30 and the outer annular space 10 on the lower end side of the intermediate cylinder 3 The overflow discharge tube 2 has an overflow port 2a on the upper end side, the lower end side communicates with the liquid outlet 6 to be treated, and faces the upper portion of the annular space 10 (cooling water outlet) (cooling water). outlet header) 8 and with the liquid to be treated inlet 5 is provided, the heat exchange medium inlet (cooling faces the upper portion of the intermediate cylinder 3 Inlet header) 7 are provided, a plurality of heat transfer tubes 4 from the top of the main heat exchanger portions H1 as well as connected to a heat exchange medium outlet 8, liquid passage portion from the lower portion of the main heat exchanger portions H1 10a and the intermediate tube 3 is connected to the heat exchange medium inlet 7 through the inside of the intermediate tube 3 to form the auxiliary heat exchange portion H2 inside the intermediate cylinder 3, and the liquid to be processed L introduced from the liquid inlet 5 to be processed is in the annular space 10 In the main heat exchanging portion H1, heat exchange with the heat exchanging medium C, and then entering the intermediate cylinder 3 from the liquid circulation portion 10a and rising in the sub heat exchanging portion H2 After heat exchange, the liquid is introduced into the overflow port 2a of the overflow discharge cylinder 2 and led out from the liquid outlet 6 to be treated.

また、上記請求項１の多重コイル型熱交換器の好適態様として、請求項２の発明は、被処理液Ｌが腐食性成分を含み、伝熱管４がフッ素樹脂製チューブからなると共に、熱交換槽１内の他の接液部表面がフッ素樹脂からなる構成としている。同じく請求項３の発明は、被処理液Ｌが高温の酸廃水であり、熱交換媒体が冷却水Ｃである構成としている。 As a preferred embodiment of the multi-coil heat exchanger of claim 1, the invention of claim 2 is that the liquid L to be treated contains a corrosive component, the heat transfer tube 4 is made of a fluororesin tube, and heat exchange is performed. The surface of the other wetted part in the tank 1 is made of a fluororesin. Similarly, the invention of claim 3 is configured such that the liquid L to be treated is high-temperature acid waste water and the heat exchange medium is cooling water C.

更に、請求項４の発明は、上記請求項１〜３のいずれかの多重コイル型熱交換器において、環状空間１０に、半径方向に沿う複数枚の多孔板９が上縁を溢流排出筒２の溢流口２ａよりも低位として周方向に略等配して配置され、これら多孔板９の孔部９ａに主熱交換部Ｈ１を形成する伝熱管４が挿通されて相互間に被処理液流通間隙を置いた多重コイル状の巻回状態をなす構成としている。そして、この請求項４の多重コイル型熱交換器において、請求項５の発明は、熱交換槽１が着脱可能な蓋板１２を有し、この蓋板１２に熱交換媒体出入口７，８及び被処理液入口５が設けられると共に、多孔板９が該蓋板１２に支持部材１３を介して取り付けられ、各多孔板９の内側縁下部に筒受け部９ｂが突設され、中間筒３が下縁３ａで該筒受け部９ｂに支承されてなる構成としている。 Further, the invention according to claim 4 is the multi-coil heat exchanger according to any one of claims 1 to 3, wherein a plurality of perforated plates 9 along the radial direction has an upper edge in the annular space 10 and an overflow discharge cylinder. than 2 overflow port 2a is arranged by disposing a substantially constant circumferentially low, heat transfer tubes 4 forming the main heat exchanger H1 is the hole portion 9a of the porous plate 9 is inserted in the treated therebetween A multi-coiled winding state with a liquid flow gap is provided. In the multiple coil heat exchanger according to claim 4, the invention according to claim 5 includes a cover plate 12 to which the heat exchange tank 1 can be attached and detached, and the cover plate 12 has heat exchange medium inlets 7 and 8 and A liquid inlet 5 is provided, and a perforated plate 9 is attached to the lid plate 12 via a support member 13, a tube receiving portion 9 b is projected from the lower inner edge of each perforated plate 9, and the intermediate tube 3 is The lower edge 3a is supported by the tube receiving portion 9b.

次に、本発明の効果について、図面の参照符号を付して説明する。まず、請求項１の発明に係る多重コイル型熱交換器では、被処理液入口５から導入された被処理液Ｌは、中間筒３の外側の環状空間１０を下降し、この下降過程で主熱交換部Ｈ１の多重コイル状に巻回した多数の伝熱管４の間を通過し、これら伝熱管４内を流れる熱交換媒体Ｃと熱交換したのち、下部の液流通部１０ａより中間筒３内に入って上昇するが、この上昇過程においても副熱交換部Ｈ２の伝熱管４と接触し、その内部の熱交換媒体Ｃと熱交換した上で溢流排出筒２の溢流口２ａ内へ流入し、この溢流排出筒２内を流下して被処理液出口６より導出される。そして、熱交換媒体入口７が中間筒３内の上部に、熱交換媒体出口８が環状空間１０の上部にそれぞれ臨んで設けられているから、熱交換槽１内での熱交換媒体Ｃの移動方向が被処理液Ｌの移動方向に対して向流になる。従って、この多重コイル型熱交換器によれば、導入した被処理液Ｌが熱交換槽１内を下降して上昇するという長い移動経路を辿る間に、主熱交換部Ｈ１と副熱交換部Ｈ２とで２段階の熱交換が行われる上、中間筒３内では、環状空間１０内の主熱交換媒部Ｈ１での熱交換を終えた被処理液Ｌに対し、副熱交換部Ｈ２の伝熱管４内を流れる熱交換媒体Ｃが熱交換媒体入口７から流入直後の温度差の大きい状態で熱交換するから、被処理液量の多い連続的処理でも非常に高い熱交換効率が得られる。 Next, effects of the present invention will be described with reference numerals in the drawings. First, in the multi-coil heat exchanger according to the first aspect of the present invention, the liquid L to be treated introduced from the liquid inlet 5 descends in the annular space 10 outside the intermediate cylinder 3, and in this descending process, After passing through a large number of heat transfer tubes 4 wound in a multi-coil shape of the heat exchange section H1 and exchanging heat with the heat exchange medium C flowing in the heat transfer tubes 4, the intermediate cylinder 3 is formed from the lower liquid circulation section 10a. Although it enters and rises, in this ascending process, it contacts the heat transfer tube 4 of the auxiliary heat exchanging part H2, exchanges heat with the heat exchange medium C therein, and then enters the overflow outlet 2a of the overflow discharge tube 2. , Flows down in the overflow discharge cylinder 2 and is led out from the liquid outlet 6 to be processed. Since the heat exchange medium inlet 7 is provided at the upper part in the intermediate cylinder 3 and the heat exchange medium outlet 8 is provided at the upper part of the annular space 10, the movement of the heat exchange medium C in the heat exchange tank 1. The direction is countercurrent to the moving direction of the liquid L to be processed. Therefore, according to this multi-coil type heat exchanger, while the introduced liquid L to be treated follows a long movement path in which the treatment liquid L descends and rises in the heat exchange tank 1, the main heat exchange unit H1 and the sub heat exchange unit In addition to the two-stage heat exchange with H2, in the intermediate cylinder 3, the sub heat exchange section H2 has a second heat exchange section H2 with respect to the liquid L to be treated in the main heat exchange medium section H1 in the annular space 10. Since the heat exchange medium C flowing in the heat transfer tube 4 exchanges heat with a large temperature difference immediately after flowing from the heat exchange medium inlet 7 , a very high heat exchange efficiency can be obtained even in a continuous process with a large amount of liquid to be treated. .

また、この多重コイル型熱交換器では、熱交換後の被処理液Ｌの導出が溢流排出筒２を通して行われるから、熱交換槽１内での被処理液Ｌの液面が溢流排出筒２の溢流口２ａの位置に常時保たれる。従って、熱交換槽１への被処理液Ｌの導入量が変動しても、常に導入分に対応した量が導出されることになり、絞り弁等で導入量や導出量を調整する必要がないから、従来に比較して設備コスト及び稼働コストを著しく低減できる。 Further, in this multi-coil type heat exchanger, the treatment liquid L after the heat exchange is led out through the overflow discharge cylinder 2, so that the liquid level of the treatment liquid L in the heat exchange tank 1 overflows and discharges. The cylinder 2 is always kept at the position of the overflow port 2a. Therefore, even if the introduction amount of the liquid L to be processed into the heat exchange tank 1 fluctuates, the amount corresponding to the introduction amount is always derived, and it is necessary to adjust the introduction amount and the derived amount with a throttle valve or the like. Therefore, the facility cost and the operation cost can be significantly reduced as compared with the conventional case.

請求項２の発明によれば、腐食性成分を含む被処理液Ｌに対し、伝熱管４がフッ素樹脂製チューブからなり、熱交換槽１内の他の接液部表面がフッ素樹脂からなるため、該被処理液Ｌによる熱交換槽１内の腐食が防止される。 According to the second aspect of the present invention, the heat transfer tube 4 is made of a fluororesin tube and the surface of the other liquid contact part in the heat exchange tank 1 is made of a fluororesin with respect to the liquid L to be treated containing corrosive components. Corrosion in the heat exchange tank 1 due to the liquid L to be treated is prevented.

請求項３の発明によれば、被処理液Ｌである高温の酸廃水を冷却水Ｃとの熱交換によって効率よく低温化できる。 According to the invention of claim 3 , the high-temperature acid waste water that is the liquid to be treated L can be efficiently cooled by heat exchange with the cooling water C.

請求項４の発明によれば、環状空間１０内で周方向に等配した複数枚の多孔板９により、主熱交換部Ｈ１の伝熱管４が相互間に流通間隙を置いた状態に安定的に保持されると共に、該多孔板９の上縁が溢流排出筒２の溢流口２ａよりも低位にあるため、被処理液入口５より導入された被処理液Ｌが環状空間１０の全周に分配して均等に熱交換される。 According to the invention of claim 4 , the plurality of perforated plates 9 equally distributed in the circumferential direction in the annular space 10 is stable in a state in which the heat transfer tubes 4 of the main heat exchanging portion H <b> 1 have a circulation gap therebetween. Since the upper edge of the perforated plate 9 is lower than the overflow port 2 a of the overflow discharge tube 2, the liquid L to be processed introduced from the liquid inlet 5 is all in the annular space 10. The heat is distributed evenly around the circumference.

請求項５の発明によれば、熱交換槽１の着脱可能な蓋板１２に熱交換媒体出入口７，８及び被処理液入口５が設けられ、多孔板９も該蓋板１２に支持部材１３を介して取り付けられ、中間筒３が該多孔板９の筒受け部９ｂに支承されているから、異常発生時や清掃時に蓋板１２を持ち上げて外すだけで、熱交換槽１内を溢流排出筒２のみが残る空状態にすることができる。 According to the invention of claim 5 , the heat exchange medium inlet / outlet ports 7 and 8 and the liquid inlet 5 to be processed are provided on the removable cover plate 12 of the heat exchange tank 1, and the porous plate 9 is also provided on the cover plate 12 with the support member 13. Since the intermediate tube 3 is supported by the tube receiving portion 9b of the perforated plate 9, it overflows in the heat exchange tank 1 simply by lifting and removing the cover plate 12 when an abnormality occurs or during cleaning. It can be made the empty state in which only the discharge cylinder 2 remains.

本発明の一実施形態に係るに多重コイル型熱交換器の要部を破断して示す正面図である。It is a front view which fractures | ruptures and shows the principal part of the multi-coil type heat exchanger which concerns on one Embodiment of this invention. 同多重コイル型熱交換器の平面図である。It is a top view of the multiple coil type heat exchanger. 図１のＸ−Ｘ線の断面矢視図である。It is a cross-sectional arrow view of the XX line of FIG. 同多重コイル型熱交換器における被処理液及び熱交換媒体の流れを示す模式縦断面図である。It is a schematic longitudinal cross-sectional view which shows the to-be-processed liquid and the flow of a heat exchange medium in the multi-coil type heat exchanger. 従来例の多重コイル型熱交換器の要部を破断して示す正面図である。It is a front view which fractures | ruptures and shows the principal part of the multiple coil type heat exchanger of a prior art example.

以下に、本発明の一実施形態として、高温の酸廃水等の被処理液Ｌを連続的処理によって冷却水Ｃと熱交換して低温化する多重コイル型熱交換器について、図面を参照して具体的に説明する。 Hereinafter, as one embodiment of the present invention, a multi-coil heat exchanger that heats a liquid L to be treated, such as high-temperature acid wastewater, with a cooling water C by continuous treatment and lowers the temperature will be described with reference to the drawings. This will be specifically described.

図１〜図３に示すように、この多重コイル型熱交換器は、上方に開放した槽本体１１と蓋板１２とからなる縦円筒状で密閉型の熱交換槽１内に、上下方向に沿う溢流排出筒２と、該溢流排出筒２を同心状に取囲む中間筒３とを備えている。そして、蓋板１２には、中間筒２内の上部に臨んで冷却水入口ヘッダー７が設けられると共に、該中間筒３と槽本体１１の周壁部１１ａとの間で構成される環状空間１０の上部に臨んで、被処理液入口５と冷却水出口ヘッダー８が設けられている。また、槽本体１１の底壁部１１ｂの中央には、溢流排出筒２内に連通する被処理液出口６が設けてある。 As shown in FIGS. 1 to 3, this multi-coil heat exchanger is vertically arranged in a vertically cylindrical and sealed heat exchange tank 1 composed of a tank body 11 and a cover plate 12 opened upward. An overflow cylinder 2 along the line and an intermediate cylinder 3 concentrically surrounding the overflow cylinder 2 are provided. The cover plate 12 is provided with a cooling water inlet header 7 facing the upper part in the intermediate cylinder 2, and an annular space 10 formed between the intermediate cylinder 3 and the peripheral wall portion 11 a of the tank body 11. A liquid inlet 5 and a cooling water outlet header 8 are provided facing the top. Further, at the center of the bottom wall portion 11 b of the tank body 11, a liquid outlet 6 to be processed communicating with the overflow discharge tube 2 is provided.

なお、熱交換槽１の槽本体１１及び蓋板１２と中間筒３はステンレス鋼製であり、槽本体１１及び蓋板１２の内面と中間筒３の内外全表面には、ＥＴＦＥ（エチレン−パーフルオロエチレン共重合体）樹脂のコーティングが施されている。また、溢流排出筒２は、ＰＦＡ（パーフルオロアルコキシエチレン）樹脂又はＰＴＦＡ（ポリテトラフルオロエチレン）樹脂の成形体からなる。被処理液入口５及び被処理液出口６の構成部材もＰＦＡ樹脂の成形体からなる。 The tank body 11 and the cover plate 12 and the intermediate cylinder 3 of the heat exchange tank 1 are made of stainless steel, and the inner surface of the tank body 11 and the cover plate 12 and the inner and outer surfaces of the intermediate cylinder 3 are all made of ETFE (ethylene-par Fluoroethylene copolymer) resin coating is applied. The overflow discharge tube 2 is made of a molded body of PFA (perfluoroalkoxyethylene) resin or PTFA (polytetrafluoroethylene) resin. The constituent members of the liquid inlet 5 and liquid outlet 6 are also made of a PFA resin molding.

中間筒３は、上端側で蓋板１２に接しているが、下端周縁３ａが槽本体１１の底壁部１１ｂより上位にあることで、その下方側が内側空間３０と外側の環状空間１０とを連通する液流通部１０ａを形成している。また、溢流排出筒２は、上端側が溢流口２ａとして中間筒３の内側空間３０の上部で開口している。 The intermediate cylinder 3 is in contact with the cover plate 12 at the upper end side, but the lower end peripheral edge 3a is higher than the bottom wall portion 11b of the tank body 11, so that the lower side thereof has the inner space 30 and the outer annular space 10 therebetween. A fluid circulation part 10a that communicates is formed. Further, the overflow discharge cylinder 2 is opened at the upper end of the inner space 30 of the intermediate cylinder 3 at the upper end side as an overflow port 2a.

中間筒３の外側の環状空間１０内には、半径方向に沿う複数枚（図３では４枚として例示）のＥＴＦＥ樹脂製の多孔板９が周方向に等配して配置し、これら多孔板９の孔部９ａを通して、ＰＦＡ樹脂製チューブからなる複数本（図３では１８本として例示）の伝熱管４を中間筒３周りに多重コイル状に巻回することにより、隣接する伝熱管４，４間に流通間隙ｔを有する主熱交換部Ｈ１が形成されている。 In the annular space 10 outside the intermediate cylinder 3, a plurality of porous plates 9 made of ETFE resin (illustrated as four in FIG. 3) along the radial direction are arranged equally in the circumferential direction. By winding a plurality of heat transfer tubes 4 (illustrated as 18 in FIG. 3) made of PFA resin tubes in a multiple coil shape around the intermediate cylinder 3 through the hole 9 a of the adjacent holes 9, A main heat exchanging portion H1 having a flow gap t between the four is formed.

図４に示すように、各伝熱管４は、冷却水入口ヘッダー７から中間筒３の内側空間３０内を垂下し、液流通部１０ａを通って外側の環状空間１０内に至り、該環状空間１０内で下方側からコイル状に巻回し、その上方で冷却水出口ヘッダー８に接続している。そして、中間筒３の内側空間３０内では、複数本の伝熱管４が溢流排出筒２を取り巻く形で垂下していることにより、副熱交換部Ｈ２を構成している。なお、図１における中間筒３の内側空間３０では、複数本（図３では１８本）の伝熱管４の内の一部のみを図示しているが、これら伝熱管４は溢流排出筒２の全周囲を均等に取り囲むように配置している。 As shown in FIG. 4, each heat transfer tube 4 hangs down from the cooling water inlet header 7 in the inner space 30 of the intermediate cylinder 3, passes through the liquid circulation portion 10 a, and reaches the outer annular space 10. 10 is wound in a coil shape from the lower side, and connected to the cooling water outlet header 8 at the upper side. And in the inner space 30 of the intermediate | middle cylinder 3, the sub-heat exchange part H2 is comprised because the several heat exchanger tube 4 is hanging down in the form surrounding the overflow discharge cylinder 2. As shown in FIG. In the inner space 30 of the intermediate cylinder 3 in FIG. 1, only a part of the plurality of heat transfer tubes 4 (18 in FIG. 3) is illustrated, but these heat transfer tubes 4 are the overflow discharge tube 2. It is arranged so as to evenly surround the entire circumference.

各多孔板９は、図１に示すように、略縦長矩形であって、その外端側上部において、蓋板１２に上端側を固着したステンレス鋼製で縦帯板状の支持部材１３の下部に、ＰＴＦＡ樹脂又はＥＴＦＥ樹脂からなるボルト・ナット１３ａを介して支持されており、上縁が溢流排出筒２の溢流口２ａよりも低位になった状態で、環状空間１０を略仕切るように配置している。そして、該多孔板９の内側縁下部には略Ｌ字形の筒受け部９ｂが突設され、中間筒３が下端周縁３ａで該筒受け部９ｂに支承されることで、該中間筒３の内部空間３０と外側の環状空間１０とを連通する前記の液流通部１０ａを確保している。なお、支持部材１３の全表面にもＥＴＦＥ樹脂のコーティングが施されている。 As shown in FIG. 1, each porous plate 9 has a substantially vertically long rectangular shape, and the lower end of a support member 13 made of stainless steel with an upper end fixed to the lid plate 12 at the upper end on the outer end side. Further, the annular space 10 is substantially partitioned with the upper edge being lower than the overflow port 2a of the overflow discharge cylinder 2 and supported by a bolt / nut 13a made of PTFA resin or ETFE resin. Is arranged. Then, a substantially L-shaped tube receiving portion 9b is protruded from the lower portion of the inner edge of the perforated plate 9, and the intermediate tube 3 is supported by the tube receiving portion 9b at the lower peripheral edge 3a. The liquid circulation part 10a that communicates the internal space 30 with the outer annular space 10 is secured. The entire surface of the support member 13 is also coated with ETFE resin.

冷却水入口ヘッダー７及び冷却水出口ヘッダー８は、同様構造のステンレス鋼製であって、下向きに開放する半球状のカップ部７０，８０の下端周縁にフランジ部７ａ，８ａが一体形成されると共に、該カップ部７０，８０の頂部にフランジ付き管軸７ｂ，８ｂが連設されている。そして、両ヘッダー７，８は、そのフランジ部７ａ，８ａにおいて、蓋板１２の開口部分の上面側周縁に固着された取付リング部１２ａに対し、複数本の伝熱管４の端部を保持するＰＴＦＥ製の円形シールプレート１４を挟んだ状態で、ボルト止めされている。 The cooling water inlet header 7 and the cooling water outlet header 8 are made of stainless steel having the same structure, and flange portions 7a and 8a are integrally formed at the lower peripheral edge of the hemispherical cup portions 70 and 80 that open downward. The flanged tube shafts 7b and 8b are connected to the tops of the cup portions 70 and 80, respectively. And both headers 7 and 8 hold | maintain the edge part of the several heat exchanger tube 4 with respect to the attachment ring part 12a fixed to the upper surface side periphery of the opening part of the cover plate 12 in the flange parts 7a and 8a. It is bolted with a PTFE circular seal plate 14 in between.

上記構成の多重コイル型熱交換器では、被処理液入口５より連続的に導入される高温の酸廃水等の被処理液Ｌは、中間筒３の外側の環状空間１０を下降したのち、下部の液流通部１０ａより中間筒３内に入って上昇し、溢流排出筒２の溢流口２ａ内へ流入して被処理液出口６より導出される。そして、被処理液Ｌが外側の環状空間１０を下降する過程では、主熱交換部Ｈ１の多重コイル状に巻回した多数の伝熱管４の間を通過することで、これら伝熱管４内を流れる冷却水Ｃと熱交換するが、続いて中間筒３内を上昇する過程でも、副熱交換部Ｈ２として伝熱管４と接触し、その内部の冷却水Ｃと熱交換する。従って、高温で導入される被処理液Ｌは、その導入液量の多い連続的処理でも、熱交換槽１内を下降して上昇するという長い移動経路を辿る間に、主熱交換部Ｈ１と副熱交換部Ｈ２による２段階の熱交換により、非常に効率よく低温化される。 In the multi-coil heat exchanger having the above-described configuration, the liquid L to be treated such as high-temperature acid waste water continuously introduced from the liquid inlet 5 descends the annular space 10 outside the intermediate cylinder 3 and then moves downward. The liquid flowing part 10a enters the intermediate cylinder 3 and rises, flows into the overflow port 2a of the overflow discharge cylinder 2, and is led out from the liquid outlet 6 to be processed. And in the process in which the to-be-processed liquid L descend | falls the outer cyclic | annular space 10, it passes among these heat exchanger tubes 4 by passing between the many heat exchanger tubes 4 wound by the multiple coil shape of the main heat exchange part H1. Heat exchange with the flowing cooling water C is performed, but even in the process of subsequently rising in the intermediate cylinder 3, it contacts the heat transfer tube 4 as the auxiliary heat exchange portion H2 and exchanges heat with the cooling water C therein. Accordingly, the liquid L to be treated introduced at a high temperature, while following a long movement path of descending and rising in the heat exchange tank 1 even in the continuous treatment with a large amount of the introduced liquid, The temperature can be lowered very efficiently by the two-stage heat exchange by the sub heat exchange part H2.

また、この多重コイル型熱交換器では、被処理液Ｌの導出が溢流排出筒２を通して行われ、熱交換槽１内での被処理液Ｌの液面が溢流排出筒２の溢流口２ａの位置に常時保たれる。従って、この多重コイル型熱交換器を用いれば、被処理液Ｌの導入量が変動しても、常に導入分に対応した量が導出されることになり、絞り弁等で導入量や導出量を調整する必要がなく、その調整のための制御機構も不要となるから、従来に比較して設備コスト及び稼働コストを著しく低減できるという利点がある。なお、高温の酸廃水のように被処理液Ｌを設定温度以下に低温化する目的では、その導入量の減少に伴って冷却が強まっても支障はない。 Further, in this multi-coil heat exchanger, the liquid L to be processed is led out through the overflow discharge cylinder 2, and the liquid level of the liquid L in the heat exchange tank 1 is overflowed from the overflow discharge cylinder 2. It is always kept at the position of the mouth 2a. Therefore, if this multi-coil heat exchanger is used, even if the introduction amount of the liquid L to be treated fluctuates, the amount corresponding to the introduction amount is always derived. Since there is no need to adjust the control mechanism and a control mechanism for the adjustment is not required, there is an advantage that the equipment cost and the operation cost can be significantly reduced as compared with the conventional case. In addition, for the purpose of lowering the liquid L to be treated below the set temperature, such as high-temperature acid waste water, there is no problem even if the cooling is strengthened as the introduction amount decreases.

図１〜図３に示す実施形態の多重コイル型熱交換器において、次の装置構成及び処理条件で連続的処理による熱交換を行ったところ、次の処理結果が得られた。
〔装置構成〕
熱交換槽１：内径６００ｍｍ、内高６５０ｍｍ
溢流排出筒２：外径５３ｍｍ、厚さ６ｍｍ、槽本体内底からの高さ５４２ｍｍ
中間筒３：外径２３５ｍｍ、厚さ５ｍｍ、槽内底からの下端高さ７０ｍｍ
伝熱管４：外径１０ｍｍ、厚さ１ｍｍ、本数１８本、総内容量２２Ｌ、総表面積１３ｍ²、主熱交換部Ｈ１における相互間の流通間隙約５ｍｍ
〔処理条件〕
被処理液Ｌ：６０％硫酸相当の酸廃液、導入温度７０℃、導入量０〜４８Ｌ／分の範囲で変動、槽内流速０．００７ｍ／分、槽内液量１７０Ｌ
冷却水Ｃ：供給温度１７℃、流量５０Ｌ／分、管内流速０．９２２ｍ／分
〔処理結果〕
被処理液Ｌの導出温度：３５℃以下
冷却水Ｃの出口温度：２７℃以下
平均交換熱量：約３０，０００ｋｃａｌ In the multi-coil heat exchanger of the embodiment shown in FIGS. 1 to 3, heat exchange was performed by continuous treatment under the following apparatus configuration and treatment conditions, and the following treatment results were obtained.
〔Device configuration〕
Heat exchange tank 1: inner diameter 600 mm, inner height 650 mm
Overflow discharge cylinder 2: outer diameter 53 mm, thickness 6 mm, height from the inner bottom of the tank body 542 mm
Intermediate cylinder 3: outer diameter 235 mm, thickness 5 mm, lower end height 70 mm from the bottom of the tank
Heat transfer tube 4: outer diameter 10 mm, thickness 1 mm, number 18, total internal capacity 22L, total surface area 13m ² , flow gap between each other in main heat exchange part H1 about 5mm
[Processing conditions]
Liquid to be treated L: Acid waste liquid equivalent to 60% sulfuric acid, introduction temperature 70 ° C., variation in the introduction amount 0 to 48 L / min, flow velocity in the tank 0.007 m / min, liquid volume 170 L in the tank
Cooling water C: supply temperature 17 ° C., flow rate 50 L / min, pipe flow velocity 0.922 m / min [treatment result]
Derived temperature of liquid L to be treated: 35 ° C. or less Outlet temperature of cooling water C: 27 ° C. or less Average heat of exchange: about 30,000 kcal

本発明の多重コイル型熱交換器は、処理対象が液体になるが、実施形態のように被処理液Ｌを冷却水Ｃとの熱交換で低温化する場合に限らず、逆に被処理液Ｌを高温の熱交換媒体との熱交換で昇温させる場合にも適用できる。従って、伝熱管４に通す熱交換媒体としては、例えば、実施形態で例示した冷却水Ｃ、エチレングリコール等を含む水、各種冷媒化合物、温水、過熱水蒸気、過熱空気等より、その熱交換目的に応じて適宜選択して使用できる。一方、被処理液Ｌとしても特に制約はないが、酸廃水のように腐食性成分を含む場合、上記実施形態のように伝熱管４にフッ素樹脂製チューブを用い、且つ熱交換槽１内の溢流排出筒２及び中間筒３を含む他の接液部の表面もフッ素樹脂にて構成すれば、該被処理液Ｌによる熱交換槽１内の腐食を防止できるという利点がある。 In the multi-coil heat exchanger of the present invention, the object to be treated is liquid, but not limited to the case where the temperature of the liquid to be treated L is lowered by heat exchange with the cooling water C as in the embodiment. The present invention can also be applied to a case where L is heated by heat exchange with a high-temperature heat exchange medium. Therefore, as the heat exchange medium passed through the heat transfer tube 4, for example, water including the cooling water C exemplified in the embodiment, water containing ethylene glycol, various refrigerant compounds, hot water, superheated steam, superheated air, etc. It can be selected and used as appropriate. On the other hand, the liquid L to be treated is not particularly limited, but when a corrosive component is included like acid waste water, a fluororesin tube is used for the heat transfer tube 4 as in the above embodiment, and the heat exchange tank 1 If the surfaces of the other wetted parts including the overflow discharge cylinder 2 and the intermediate cylinder 3 are also made of a fluororesin, there is an advantage that corrosion in the heat exchange tank 1 by the liquid to be treated L can be prevented.

また、熱交換槽１内での熱交換媒体の移動方向と被処理液Ｌの移動方向とは、順流にすることも可能であるが、実施形態のように向流に設定することが好ましい。これは、向流にした場合、中間筒３内において、環状空間１０内の主熱交換媒部Ｈ１での熱交換を終えた被処理液Ｌに対し、副熱交換部Ｈ２の伝熱管４内を流れる熱交換媒体が流入直後の温度差の大きい状態で熱交換し、もって副熱交換部Ｈ２でも高い熱交換効率が得られることによる。 Moreover, although the moving direction of the heat exchange medium in the heat exchange tank 1 and the moving direction of the liquid L to be processed can be made forward, it is preferable to set them in counterflow as in the embodiment. This is because, in the case of counterflow, in the intermediate tube 3, the heat transfer tube 4 of the auxiliary heat exchange unit H2 is compared with the liquid L to be processed in the main heat exchange medium unit H1 in the annular space 10. This is because the heat exchange medium flowing through the heat exchanger exchanges heat in a state where the temperature difference is large immediately after inflow, and thus the high heat exchange efficiency can be obtained even in the auxiliary heat exchange section H2.

本発明の多重コイル型熱交換器の各構成部、例えば被処理液出入口５，６、冷却水入口ヘッダー７や冷却水出口ヘッダー８の如き熱交換媒体出入口、主熱交換部Ｈ１における多重コイル状の伝熱管４の支持部、溢流排出筒２及び中間筒３の取付部等の細部形状と配置及び取付構造等については、実施形態で例示した以外に種々設定できる。例えば、溢流排出筒２の溢流口２ａは上部の側方に開く形でもよい。また、伝熱管４の本数と主熱交換部Ｈ１における巻回数についても、実施形態以外に種々設定できる。 Each component of the multi-coil heat exchanger of the present invention, for example, the liquid inlets / outlets 5 and 6, the heat exchange medium inlet / outlet such as the cooling water inlet header 7 and the cooling water outlet header 8, and the multiple coil shape in the main heat exchanging portion H 1. The detailed shape and arrangement, the mounting structure, and the like of the support portion of the heat transfer tube 4, the overflow discharge tube 2 and the mounting portion of the intermediate tube 3 can be variously set in addition to those exemplified in the embodiment. For example, the overflow port 2a of the overflow discharge tube 2 may be open to the upper side. Further, the number of heat transfer tubes 4 and the number of windings in the main heat exchange part H1 can be variously set in addition to the embodiment.

主熱交換部Ｈ１については、実施形態のように環状空間１０内で周方向に等配する複数枚の多孔板９を利用して伝熱管４を多重コイル状に巻回すれば、これら伝熱管４を相互間に流通間隙ｔを置いた状態で安定的に保持できるという利点がある。また、該多孔板９の上縁を溢流排出筒２の溢流口２ａよりも低位にすることで、被処理液入口５より導入された被処理液Ｌが環状空間１０の全周に分配し、もって該環状空間１０の全体で均等に熱交換できるという利点がある。更に、実施形態のように、熱交換槽１の蓋板１２に熱交換媒体出入口７，８及び被処理液入口５を設け、主熱交換部Ｈ１の多孔板９も蓋板１２に支持させると共に、中間筒３を該多孔板９にて支承する構造とすれば、異常発生時や清掃時に蓋板１２を持ち上げて外すだけで、簡単に熱交換槽１内を溢流排出筒２のみが残る空状態にできるという利点がある。 About the main heat exchange part H1, if the heat exchanger tubes 4 are wound in a multi-coil shape using a plurality of perforated plates 9 equally distributed in the circumferential direction in the annular space 10 as in the embodiment, these heat exchanger tubes There is an advantage that 4 can be stably held with a flow gap t between them. In addition, by making the upper edge of the perforated plate 9 lower than the overflow port 2 a of the overflow discharge cylinder 2, the liquid L to be processed introduced from the liquid inlet 5 is distributed over the entire circumference of the annular space 10. Thus, there is an advantage that heat can be exchanged uniformly in the entire annular space 10. Further, as in the embodiment, the cover plate 12 of the heat exchange tank 1 is provided with the heat exchange medium inlets 7 and 8 and the liquid inlet 5 to be processed, and the porous plate 9 of the main heat exchange section H1 is supported by the cover plate 12. If the intermediate cylinder 3 is supported by the perforated plate 9, only the overflow discharge cylinder 2 remains in the heat exchange tank 1 simply by lifting and removing the cover plate 12 when an abnormality occurs or during cleaning. There is an advantage that it can be empty.

１熱交換槽
１０環状空間
１０ａ液流通部
１１槽本体
１２蓋板
１３支持部材
２溢流排出筒
２ａ溢流口
３中間筒
３ａ下端周縁
３０内側空間
４伝熱管
５被処理液入口
６被処理液出口
７冷却水入口ヘッダー（熱交換媒体入口）
８冷却水出口ヘッダー（熱交換媒体出口）
９多孔板
９ａ孔部
９ｂ筒受け部
Ｃ冷却水（熱交換媒体）
Ｈ１主熱交換部
Ｈ２副熱交換部
Ｌ被処理液
ｔ流通間隙 DESCRIPTION OF SYMBOLS 1 Heat exchange tank 10 Annular space 10a Liquid distribution part 11 Tank main body 12 Cover plate 13 Support member 2 Overflow discharge cylinder 2a Overflow port 3 Intermediate cylinder 3a Bottom edge 30 Inner space 4 Heat transfer pipe 5 Liquid to be processed 6 Liquid to be processed Outlet 7 Cooling water inlet header (heat exchange medium inlet)
8 Cooling water outlet header (heat exchange medium outlet)
9 Perforated plate 9a Hole 9b Tube receiving part C Cooling water (heat exchange medium)
H1 Main heat exchange part H2 Sub heat exchange part L Processed liquid t Flow gap

Claims

密閉型の熱交換槽内に、上下方向に沿う溢流排出筒と、該溢流排出筒を同心状に取囲む中間筒とを備えると共に、この中間筒の外側の環状空間内に、熱交換媒体を通す複数本の伝熱管が該中間筒周りに多重コイル状に巻回して主熱交換部を形成し、
前記中間筒の下端側に、内側空間と外側の環状空間とを連通する液流通部を有し、
前記溢流排出筒は、上端側に溢流口を備えて、下端側が被処理液出口に連通し、
前記環状空間の上部に臨んで熱交換媒体出口と被処理液入口とが設けられると共に、中間筒内の上部に臨んで熱交換媒体入口が設けられ、
前記複数本の伝熱管は、主熱交換部の上部から熱交換媒体出口に接続すると共に、該主熱交換部の下部から前記液流通部及び前記中間筒の内側を通って熱交換媒体入口に接続して、該中間筒の内側で副熱交換部を形成し、
前記被処理液入口から導入された被処理液が、前記環状空間を下降する過程で、主熱交換部において熱交換媒体と熱交換し、次いで前記液流通部より中間筒内に入って上昇する過程で、副熱交換部において熱交換媒体と熱交換したのち、溢流排出筒の溢流口に流入して被処理液出口より導出するように構成されてなる多重コイル型熱交換器。 In the sealed heat exchange tank, an overflow discharge tube extending in the vertical direction and an intermediate tube surrounding the overflow discharge tube concentrically are provided, and heat exchange is performed in an annular space outside the intermediate tube. A plurality of heat transfer tubes through which the medium passes are wound around the intermediate cylinder in a multiple coil shape to form a main heat exchange part,
On the lower end side of the intermediate cylinder, there is a liquid circulation part that communicates the inner space and the outer annular space,
The overflow discharge cylinder is provided with an overflow port on the upper end side, and the lower end side communicates with the liquid outlet to be treated.
A heat exchange medium outlet and a liquid inlet are provided facing the upper part of the annular space, and a heat exchange medium inlet is provided facing the upper part of the intermediate cylinder,
The plurality of heat transfer tubes are connected from the upper part of the main heat exchange part to the heat exchange medium outlet, and from the lower part of the main heat exchange part to the heat exchange medium inlet through the inside of the liquid circulation part and the intermediate tube. Connecting, forming a sub heat exchange part inside the intermediate cylinder,
In the process in which the liquid to be treated introduced from the liquid liquid inlet descends the annular space, the main heat exchange part exchanges heat with the heat exchange medium, and then enters the intermediate cylinder from the liquid circulation part and rises. In the process, a multi-coil heat exchanger configured to exchange heat with the heat exchange medium in the auxiliary heat exchange section, and then flow into the overflow outlet of the overflow discharge cylinder and lead out from the liquid outlet.

被処理液が腐食性成分を含み、前記伝熱管がフッ素樹脂製チューブからなると共に、熱交換槽内の他の接液部表面がフッ素樹脂からなる請求項１に記載の多重コイル型熱交換器。 The multi-coil heat exchanger according to claim 1 , wherein the liquid to be treated includes a corrosive component, the heat transfer tube is made of a fluororesin tube, and the other liquid contact surface in the heat exchange tank is made of fluororesin. .

被処理液が高温の酸廃水であり、熱交換媒体が冷却水である請求項２に記載の多重コイル型熱交換器。 The multi-coil heat exchanger according to claim 2 , wherein the liquid to be treated is high-temperature acid waste water, and the heat exchange medium is cooling water.

前記環状空間に、半径方向に沿う複数枚の多孔板が上縁を溢流排出筒の溢流口よりも低位として周方向に略等配して配置され、これら多孔板の孔部に前記主熱交換部を形成する複数本の伝熱管が挿通されて相互間に流通間隙を置いた多重コイル状の巻回状態をなす請求項１〜３のいずれかに記載の多重コイル型熱交換器。 The annular space is arranged by disposing substantially like the upper edge in the circumferential direction lower than the overflow opening of the overflow discharge tube is a plurality of perforated plates along the radial direction, the main in the hole of the perforated plate The multi-coil heat exchanger according to any one of claims 1 to 3, wherein a plurality of heat transfer tubes forming a heat exchange section are inserted to form a multi-coiled winding state with a flow gap between them.

熱交換槽が着脱可能な蓋板を有し、この蓋板に熱交換媒体出入口及び被処理液入口が設けられると共に、前記多孔板が該蓋板に支持部材を介して取り付けられ、各多孔板の内側縁下部に筒受け部が突設され、中間筒が下端周縁で該筒受け部に支承されてなる請求項４に記載の多重コイル型熱交換器。 The heat exchange tank has a detachable cover plate. The cover plate is provided with a heat exchange medium inlet / outlet and a liquid inlet, and the porous plate is attached to the cover plate via a support member. The multi-coil heat exchanger according to claim 4 , wherein a tube receiving portion projects from a lower portion of the inner edge of the inner coil, and an intermediate tube is supported by the tube receiving portion at a lower end periphery.