JP3965012B2 - Hot water bath vaporizer - Google Patents

Hot water bath vaporizer Download PDF

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Publication number
JP3965012B2
JP3965012B2 JP2000014231A JP2000014231A JP3965012B2 JP 3965012 B2 JP3965012 B2 JP 3965012B2 JP 2000014231 A JP2000014231 A JP 2000014231A JP 2000014231 A JP2000014231 A JP 2000014231A JP 3965012 B2 JP3965012 B2 JP 3965012B2
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hot water
heat transfer
transfer tube
water bath
tube bundle
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JP2001201279A (en
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正英 岩崎
和彦 浅田
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Kobe Steel Ltd
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Kobe Steel Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0017—Flooded core heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
    • F28D7/085—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0061—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for phase-change applications
    • F28D2021/0064—Vaporizers, e.g. evaporators

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、液化天然ガス（以下、ＬＮＧと称する。）等の低温気体を温水等の熱源流体を用いて気化する熱源流体式気化器に関する。
【０００２】
【従来の技術】
小規模のＬＮＧ基地において、ＬＮＧ等の低温液体を連続気化する手段としては、温水バス内に給排される温水等の熱源流体を用いる温水バス式気化器が知られている。
【０００３】
温水バス式気化器の一例を図４及び図５に示す。図４及び図５はＬＮＧ気化器を示し、この気化器は、温水バス５１、及び伝熱管束５３を備えている。温水バス５１は、両端を閉鎖した角シェル５４と、角シェル５４内を仕切る堰板５５とを備えている。温水バス５１内には、角シェル５４側面の温水入口５６、温水分散管５７により温水７０が供給される。供給された温水７０は、堰５５よりオーバーフローし、ダウンカマー５８に溜まり、温水出口５９からボイラ系の次工程に送出される。また、角シェル５４は、角構造であるため、強度的に極めて弱く、多数の補強部材６０で補強されている。さらに、温水バス５１の外表面は、熱放散を防ぐため、断熱材６１で覆われている。伝熱管束５３は、角シェル５４内に設けられ、１８０°リターンベンドを有する屈曲した多パスの伝熱管５２を多数整列配置して形成されている。各伝熱管５２は、角シェル５４内の入口ヘッダー６２及び出口ヘッダー６３に接続されている。
【０００４】
このような気化器において、温水７０は、温水入口５６から温水分散管５７により分散され、温水バス５１内に均等供給される。一方、気化対象であるＬＮＧは、入口６４から供給され、入口ヘッダー６２により各伝熱管５２に分配される。この各伝熱管５２内のＬＮＧと温水バス５１内の温水７０との熱交換により、その熱を受けてＬＮＧが各伝熱管５２内で気化し、天然ガス（以下、ＮＧと称する。）となる。このＮＧは、温水７０の熱を受けて各伝熱管５２内で加温され、出口ヘッダー６３に集合し、出口６５より次工程に送出される。また、供給された温水７０は、ＬＮＧとの熱交換により温度を下げて、堰板５５よりオーバーフローし、ダウンカマー５８に溜まり、温水出口５９よりボイラ系の次工程に送出される。
従って、この温水バス式気化器によれば、温水７０の給排を繰り返すことによって、ＬＮＧを連続的に気化させることができる。
【０００５】
【発明が解決しようとする課題】
従来の温水バス式気化器は、図４及び図５に示す通り、角シェル５４を角構造とし、各伝熱管５２を１８０°リターンベンドを有する多パスにして、これを多数整列配置しているので、温水バス５１を大きなバスサイズとする必要がある。角シェル５４が角構造であるため強度的に弱く、補強部材６０を多く必要とする。以上のことから、温水バス式気化器が大型化し、小規模の基地への設置面積及び製品重量も大きくなる。温水バス５１が大きなバスサイズであると、温水７０の供給量が多くなり、満水重量が大きく従って基礎重量も大となる。
また、温水バス５１の基地への設置は補強部材６０を据付けて行うので、断熱材６１の工事は、現地据付け後では角シェル５４の底ができないため、製作工場内での施工が必要であった。
【０００６】
本発明は、かかる事情に鑑み、軽量、小型化を図ることでき、しかも安価な温水バス式気化器を提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記課題を解決するための手段として、本発明は、温水バスを形成するシェル本体内に、温水と熱交換して液化ガスを蒸発させる伝熱管束を設け、この伝熱管束を、端部に複数の１８０°リターンベンドを有する多パスの伝熱管を多数列並べて形成してなる温水バス式気化器において、前記シェル本体を水平円筒型にし、前記円筒の軸方向から見て、前記伝熱管束の前記伝熱管が円筒断面内に有効に配置できるように前記リターンベンドを斜めを含む配置にしたものである。
この構成によれば、シェル本体を水平円筒型にすることにより、角シェルのような補強部材が必要なくなり、製品重量の低減を図ることができる。伝熱管束の伝熱管は、リターンベンドを斜めを含む配置にすることにより、シェル本体の円筒断面内に有効配置できる。
また、据付け現場では、シェル本体の円周を支持するだけで据付けられ、断熱材工事も据付けた後でもシェル本体の円周に施工できる。
【０００８】
また、リターンベンドにより多パスの伝熱管の各列が上下に配置されて前記伝熱管束が形成され、前記水平円筒の両側面に一対の整流板が設けられるものである。
水平円筒の両側面に一対の整流板を設けることにより、伝熱管束とシェル本体の内周との間で温水がバイパスするスペースをなくすことができる。
さらに、前記一対の整流板の少なくとも一方が前記温水の堰板と兼用することが好ましい。これにより、伝熱管束の伝熱管に対する温水の流動分布を良くすることができる。
【０００９】
【発明の実施の形態】
以下、本発明の好ましい実施の形態を図１〜図３に基づいて説明する。図１は、本発明の実施形態に係る温水バス式気化器を示す断面正面図であり、図２は、図１のＡ−Ａ断面図であり、図３は、図１及び図２における伝熱管束の伝熱管の配置態様を示す拡大斜視図である。
【００１０】
図１及び図２に示す温水バス式気化器は、小規模な基地に適したものであって、この気化器は、温水バス１を形成するシェル本体２と、このシェル本体２内に設けられる伝熱管束３と、一対の整流板１５，１６を備えてなる。
【００１１】
シェル本体２は、水平円筒型に形成され、両端を蓋板４，５で閉鎖することにより温水バス１を形成する。シェル本体２は、水平円筒型であるため、強度的に強く、補強部材を必要としない。シェル本体２内には、入口ベッダー６と、出口ヘッダー７と、温水分散管８とを備えている。入口ヘッダー６及び出口ヘッダー７は、蓋板４側で円筒断面の上下に配置され、温水分散管８は円筒断面の下側に配置されている。また、シェル本体２の側面には温水入口９及び温水出口１３が設けられ、シェル本体２の上面には２つのマンホール１０が設けられている。温水２５は、温水入口９に供給され、温水分散管８により温水バス１内に均等供給される。
【００１２】
伝熱管束３は、温水２５と熱交換してＬＮＧを蒸発させるもので、図２に明瞭に示されるように、伝熱管１１を多数列並べて形成されており、各伝熱管１１の各列が各ヘッダー６，７間の上下に配置されてなる。各伝熱管１１は、１８０°リターンベンド１２を有して屈曲しており、シェル本体２内に水平に延びて多数回パスされる。また、各伝熱管１１の始端及び終端は、各ヘッダー６，７内に接続されている。図２及び図３に明瞭に示されるように、シェル本体２の内周の軸方向から見て、各伝熱管１１は、複数のリターンベンド１２を水平方向に対して並行、又は斜めに配置することにより、シェル本体２の内周に向けて広がるジグザグ状に配置される。伝熱管１１の各リターンベンド１２は、上記並行、斜め配置を選択・組合わせることにより、伝熱管１１の各列間に隙間をあけ、シェル本体２の内周に広がるようにしている。この伝熱管束３は、伝熱管１１の各リターンベンド１２を並行、又は斜め配置するため、各伝熱管１１をシェル本体２の円筒断面内に有効に配置できる。
具体的には、図２に明瞭に示されるように、伝熱管束３の両側にある伝熱管１１Ａ，１１Ｂであって、各ヘッダー６，７側に最も近いリターンベンド１２Ａ，１２Ｂを、各ヘッダー６，７又は水平方向に対して並行配置する。各リターンベンド１２Ａ，１２Ｂの間にある他のリターンベンド１２は、前記のように水平方向に対して斜め配置する。また、伝熱管１１Ａ，１１Ｂの間にある他の伝熱管１１は、リターンベンド１２を前記のように水平方向に対して並行、又は斜め配置し、伝熱管１１の各列間に隙間をあけるようにジグザグ状に配置する。これで、伝熱管束３は、水平方向と直交する側から押しつぶした状態で、水平方向に長くなるように各伝熱管１１を配置することになり、シェル本体２の円筒断面内に有効に配置できる。なお、水平方向とは、各ヘッダー６，７が延在して形成される方向である。
【００１３】
一対の整流板１５，１６は、シェル本体２内の水平円筒の両側面に設けられている。図２に明瞭に示されるように、各整流板１５，１６は、伝熱管束３の両側に接近して配置されるため、伝熱管束３とシェル本体２の内周との間で温水２５がバイパスするスペースをなくすことができる。整流板１６は、出口ヘッダー７側で傾けられており、供給される温水２５を堰止める堰板と兼用されている。供給された温水２５は、整流板１６よりオーバーフローし、ダウンカマー１８に溜まり、温水出口１３からボイラ系の次工程に送出される。
【００１４】
前記温水バス式気化器において、温水２５は、温水入口９から温水分散管８により分散され、温水バス１内に均等供給される。一方、気化対象であるＬＮＧは、入口１７から供給され、入口ヘッダー６により伝熱管束３の各伝熱管１１に分配される。この各伝熱管１１内のＬＮＧと温水２５との熱交換により、その熱を受けてＬＮＧが各伝熱管１１内で蒸発し、ＮＧとなる。このＮＧは、温水２５の熱を受けて各伝熱管１１内で加温され、出口ヘッダー７に集合し、出口１８より次工程に送出される。
【００１５】
この温水バス式気化器は、シェル本体２を水平円筒型にするため、角シェルのような補強部材が必要なくなり、製品重量の低減を図ることができ、コストダウンが図れる。また、伝熱管束３の各伝熱管１１は、複数のリターンベンド１２を各ヘッダー６，７又は水平方向に対して並行、又は斜め配置することにより、シェル本体２の円筒断面内に有効配置でき、シェル本体２等を含む気化器の小型化を図れる。また、気化器の小型化を図ることにより、設置面積を少なくでき、満水重量を少なくして基礎重量も小さくできる。また、据付け現場では、図１に明瞭に示されるように、シェル本体２の円周をサドル１９で支持するだけで据付けられ、断熱材２０の工事も据付け後でもシェル本体２の円周に施工でき、現地工事性及びメンテナンス性が向上する。
【００１６】
一対の整流板１５，１６を設けることにより、伝熱管束３とシェル本体２の内周との間で温水２５がバイパスするスペースをなくすことができ、温水２５の伝熱管束３への循環が良くなり、温水２５とＬＮＧとの熱交換を高めて、ＬＮＧの気化性能を向上することが可能となる。。また、整流板１６を堰板と兼用することにより、伝熱管束３の伝熱管１１に対する温２５水の流動分布が良くなり、ＬＮＧの気化性能を向上することができる。
【００１７】
さらに、伝熱管束３をシェル本体２から抜き出せる構造とすることにより、蓋材４をシェル本体２から取り外して行う伝熱管束３の検査及び保守が容易に行うことができる。また、簡単な検査及び保守では、伝熱管束３を抜き出すことなく、マンホール１０からオペレータがシェル本体２内に入って行うことも可能である。
【００１８】
なお、本発明の実施形態は、図示のもに限られず、例えば次のような形態をとることができる。
（１）伝熱管１１のリターンベンド１２の配置は、各ヘッダー６，７に対して並行、斜めの他に、直交するものを選択・組合わせることで、伝熱管１１をジグザグ状に配置できる。
（２）液化ガスとして液化天然ガスを気化することについて説明したが、これに限定されるものでなく、例えば、液化エチレン、ＬＯ2 （液化酸素）、ＬＮ2 （液化窒素）等を気化するものにも適用できる。
（３）各ヘッダー６，７は、シェル本体２の一端である蓋板４側に配置するものに限られず、両側にそれぞれ配置することもできる。
（４）各ヘッダー６，７は、管で形成する他、両端を閉鎖した筒体内を仕切り板で仕切ることで形成することもできる。
【００１９】
【発明の効果】
以上のように本発明は、シェル本体を水平円筒型に形成するため、角シェルのような補強部材が必要なくなり、製品重量の低減を図ることができ、コストダウンが図れる。また、伝熱管束の各伝熱管は、リターンベンドを斜めを含む配置にすることにより、シェル本体の円筒断面内に有効配置でき、シェル本体を含む気化器の小型化を図れる。
これにより、温水バス式気化器の設置面積を少なくでき、満水重量を少なくして基礎重量も小さくできる。
さらに、シェル本体の円周を支持するだけで据付けられ、断熱材の工事も据付け後でもシェル本体に施工でき、現地工事性及びメンテナンス性が向上する。
【図面の簡単な説明】
【図１】本発明の実施形態に係る温水バス式気化器を示す断面正面図である。
【図２】図１のＡ−Ａ断面図である。
【図３】図１、図２における伝熱管束の伝熱管の配置態様を示す拡大斜視図である。
【図４】従来の温水バス式気化器を示す断面正面図である。
【図５】図４のＢ−Ｂ断面図である。
【符号の説明】
１ 温水バス
２ シェル本体
３ 伝熱管束
１１ 伝熱管
１２ リターンベンド
１５ 整流板
１６ 整流板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat source fluid vaporizer that vaporizes a low temperature gas such as liquefied natural gas (hereinafter referred to as LNG) using a heat source fluid such as hot water.
[0002]
[Prior art]
As a means for continuously vaporizing a low temperature liquid such as LNG in a small-scale LNG base, a hot water bath type vaporizer using a heat source fluid such as hot water supplied and discharged into the hot water bath is known.
[0003]
An example of a hot water bath type vaporizer is shown in FIG.4 and FIG.5. 4 and 5 show an LNG vaporizer, and this vaporizer includes a hot water bath 51 and a heat transfer tube bundle 53. The hot water bath 51 includes a square shell 54 whose both ends are closed, and a weir plate 55 that partitions the inside of the square shell 54. Hot water 70 is supplied into the hot water bath 51 through a hot water inlet 56 on the side surface of the square shell 54 and a hot water dispersion pipe 57. The supplied hot water 70 overflows from the weir 55, accumulates in the downcomer 58, and is sent from the hot water outlet 59 to the next process of the boiler system. Further, since the square shell 54 has a square structure, it is extremely weak in strength and is reinforced by a large number of reinforcing members 60. Furthermore, the outer surface of the hot water bath 51 is covered with a heat insulating material 61 in order to prevent heat dissipation. The heat transfer tube bundle 53 is provided in the square shell 54, and is formed by arranging a large number of bent multi-pass heat transfer tubes 52 having a 180 ° return bend. Each heat transfer tube 52 is connected to an inlet header 62 and an outlet header 63 in the square shell 54.
[0004]
In such a vaporizer, the hot water 70 is dispersed from the hot water inlet 56 by the hot water dispersion pipe 57 and is uniformly supplied into the hot water bath 51. On the other hand, LNG to be vaporized is supplied from the inlet 64 and distributed to the heat transfer tubes 52 by the inlet header 62. By heat exchange between the LNG in each heat transfer tube 52 and the hot water 70 in the hot water bath 51, the LNG is vaporized in each heat transfer tube 52 by receiving the heat and becomes natural gas (hereinafter referred to as NG). . The NG receives heat from the hot water 70 and is heated in each heat transfer tube 52, gathers at the outlet header 63, and is sent from the outlet 65 to the next process. The supplied hot water 70 is cooled by heat exchange with LNG, overflows from the weir plate 55, accumulates in the downcomer 58, and is sent from the hot water outlet 59 to the next process of the boiler system.
Therefore, according to this hot water bath type vaporizer, LNG can be continuously vaporized by repeatedly supplying and discharging hot water 70.
[0005]
[Problems to be solved by the invention]
As shown in FIGS. 4 and 5, the conventional hot water bath type vaporizer has a square structure of the square shell 54, and each heat transfer tube 52 has a multipath having a 180 ° return bend, and a large number of these are arranged in an array. Therefore, it is necessary to make the hot water bus 51 into a large bus size. Since the square shell 54 has a square structure, it is weak in strength and requires many reinforcing members 60. From the above, the hot water bath type vaporizer becomes larger, and the installation area and the product weight on a small base become larger. When the hot water bath 51 is a large bath size, the supply amount of the hot water 70 is increased, the full water weight is large, and the basic weight is also large.
In addition, since the installation of the hot water bath 51 at the base is performed by installing the reinforcing member 60, the construction of the heat insulating material 61 requires the construction in the production factory because the bottom of the square shell 54 cannot be obtained after the field installation. It was.
[0006]
In view of such circumstances, an object of the present invention is to provide a hot water bath type vaporizer that can be reduced in weight and size and is inexpensive.
[0007]
[Means for Solving the Problems]
As a means for solving the above problems, the present invention provides a heat transfer tube bundle that exchanges heat with hot water to evaporate the liquefied gas in the shell body forming the hot water bath, and this heat transfer tube bundle is provided at the end. In a hot water bath type vaporizer formed by arranging a plurality of multi-pass heat transfer tubes having a plurality of 180 ° return bends, the shell body is formed in a horizontal cylindrical shape, and the heat transfer tube bundle is viewed from the axial direction of the cylinder. The return bend is arranged so as to include a slant so that the heat transfer tube can be effectively arranged in a cylindrical cross section.
According to this configuration, by making the shell body a horizontal cylindrical shape, a reinforcing member such as a square shell is not necessary, and the product weight can be reduced. The heat transfer tubes of the heat transfer tube bundle can be effectively arranged within the cylindrical cross section of the shell body by arranging the return bend to include an oblique line.
Moreover, at the installation site, it is installed only by supporting the circumference of the shell body, and can be applied to the circumference of the shell body even after the heat insulation work is installed.
[0008]
The rows of multi-pass heat transfer tubes are arranged one above the other by return bends to form the heat transfer tube bundle, and a pair of rectifying plates are provided on both side surfaces of the horizontal cylinder.
By providing a pair of rectifying plates on both side surfaces of the horizontal cylinder, a space where hot water bypasses between the heat transfer tube bundle and the inner periphery of the shell body can be eliminated.
Furthermore, it is preferable that at least one of the pair of rectifying plates also serves as the warm water dam plate. Thereby, the flow distribution of the warm water with respect to the heat exchanger tube of a heat exchanger tube bundle can be improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional front view showing a hot water bath type vaporizer according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a transmission diagram in FIGS. It is an expansion perspective view which shows the arrangement | positioning aspect of the heat exchanger tube of a heat tube bundle.
[0010]
The hot water bath type vaporizer shown in FIGS. 1 and 2 is suitable for a small base, and this vaporizer is provided in the shell main body 2 forming the hot water bath 1 and in the shell main body 2. The heat transfer tube bundle 3 and a pair of rectifying plates 15 and 16 are provided.
[0011]
The shell body 2 is formed in a horizontal cylindrical shape, and the hot water bath 1 is formed by closing both ends with the cover plates 4 and 5. Since the shell body 2 is a horizontal cylindrical type, it is strong in strength and does not require a reinforcing member. In the shell main body 2, an inlet bedder 6, an outlet header 7, and a hot water dispersion pipe 8 are provided. The inlet header 6 and the outlet header 7 are disposed above and below the cylindrical cross section on the lid plate 4 side, and the hot water dispersion pipe 8 is disposed below the cylindrical cross section. Further, a hot water inlet 9 and a hot water outlet 13 are provided on the side surface of the shell body 2, and two manholes 10 are provided on the upper surface of the shell body 2. The hot water 25 is supplied to the hot water inlet 9 and is uniformly supplied into the hot water bath 1 by the hot water dispersion pipe 8.
[0012]
The heat transfer tube bundle 3 evaporates LNG by exchanging heat with the hot water 25. As clearly shown in FIG. 2, the heat transfer tube bundle 3 is formed by arranging a large number of heat transfer tubes 11, and each of the heat transfer tubes 11 includes It is arranged above and below between the headers 6 and 7. Each heat transfer tube 11 is bent with a 180 ° return bend 12, extends horizontally into the shell body 2, and is passed many times. In addition, the start end and the end of each heat transfer tube 11 are connected in each header 6, 7. As clearly shown in FIGS. 2 and 3, when viewed from the axial direction of the inner periphery of the shell body 2, each heat transfer tube 11 has a plurality of return bends 12 arranged in parallel or obliquely with respect to the horizontal direction. Thereby, it arrange | positions in the zigzag shape which spreads toward the inner periphery of the shell main body 2. FIG. The return bends 12 of the heat transfer tubes 11 are selected and combined with the parallel and oblique arrangements described above, so that gaps are formed between the rows of the heat transfer tubes 11 and spread around the inner periphery of the shell body 2. In the heat transfer tube bundle 3, the return bends 12 of the heat transfer tubes 11 are arranged in parallel or obliquely, so that the heat transfer tubes 11 can be effectively arranged in the cylindrical cross section of the shell body 2.
Specifically, as clearly shown in FIG. 2, the return bends 12A and 12B closest to the headers 6 and 7 in the heat transfer tubes 11A and 11B on both sides of the heat transfer tube bundle 3 are connected to the headers. 6, 7 or parallel to the horizontal direction. The other return bends 12 between the return bends 12A and 12B are arranged obliquely with respect to the horizontal direction as described above. Further, in the other heat transfer tubes 11 between the heat transfer tubes 11A and 11B, the return bends 12 are arranged in parallel or obliquely with respect to the horizontal direction as described above so that a gap is formed between each row of the heat transfer tubes 11. Place them in a zigzag pattern. Thus, in the heat transfer tube bundle 3, the heat transfer tubes 11 are arranged to be long in the horizontal direction in a state where they are crushed from the side orthogonal to the horizontal direction, and are effectively arranged in the cylindrical cross section of the shell body 2. it can. The horizontal direction is a direction in which the headers 6 and 7 are extended.
[0013]
The pair of rectifying plates 15 and 16 are provided on both side surfaces of the horizontal cylinder in the shell body 2. As clearly shown in FIG. 2, each of the rectifying plates 15 and 16 is disposed close to both sides of the heat transfer tube bundle 3, so that the hot water 25 is between the heat transfer tube bundle 3 and the inner periphery of the shell body 2. Can eliminate the space to bypass. The rectifying plate 16 is inclined on the outlet header 7 side, and is also used as a dam plate for blocking the supplied hot water 25. The supplied hot water 25 overflows from the current plate 16, accumulates in the downcomer 18, and is sent from the hot water outlet 13 to the next process of the boiler system.
[0014]
In the warm water bath type vaporizer, the warm water 25 is dispersed from the warm water inlet 9 by the warm water dispersion pipe 8 and is uniformly supplied into the warm water bath 1. On the other hand, the LNG to be vaporized is supplied from the inlet 17 and distributed to the heat transfer tubes 11 of the heat transfer tube bundle 3 by the inlet header 6. By the heat exchange between the LNG in each heat transfer tube 11 and the hot water 25, the LNG evaporates in each heat transfer tube 11 by receiving the heat and becomes NG. The NG receives heat from the hot water 25 and is heated in each heat transfer tube 11, gathers at the outlet header 7, and is sent from the outlet 18 to the next process.
[0015]
In this hot water bath type vaporizer, since the shell main body 2 is formed in a horizontal cylindrical shape, a reinforcing member such as a square shell is not necessary, the product weight can be reduced, and the cost can be reduced. Further, each heat transfer tube 11 of the heat transfer tube bundle 3 can be effectively arranged in the cylindrical cross section of the shell body 2 by arranging a plurality of return bends 12 in parallel or obliquely with respect to the headers 6 and 7 or the horizontal direction. The vaporizer including the shell body 2 and the like can be downsized. Further, by reducing the size of the vaporizer, the installation area can be reduced, the full water weight can be reduced, and the basic weight can be reduced. In addition, at the installation site, as clearly shown in FIG. 1, the shell body 2 can be installed just by supporting the circumference of the shell body 2 with the saddle 19, and the construction of the heat insulating material 20 is performed on the circumference of the shell body 2 even after installation. This will improve the site workability and maintainability.
[0016]
By providing the pair of rectifying plates 15 and 16, a space where the hot water 25 bypasses between the heat transfer tube bundle 3 and the inner periphery of the shell body 2 can be eliminated, and circulation of the hot water 25 to the heat transfer tube bundle 3 can be eliminated. As a result, the heat exchange between the hot water 25 and the LNG can be enhanced, and the vaporization performance of the LNG can be improved. . Further, by using the rectifying plate 16 also as the barrier plate, the flow distribution of the warm 25 water with respect to the heat transfer tube 11 of the heat transfer tube bundle 3 is improved, and the vaporization performance of LNG can be improved.
[0017]
Further, by adopting a structure in which the heat transfer tube bundle 3 can be extracted from the shell main body 2, the inspection and maintenance of the heat transfer tube bundle 3 performed by removing the lid member 4 from the shell main body 2 can be easily performed. Further, simple inspection and maintenance can be performed by an operator entering the shell body 2 from the manhole 10 without extracting the heat transfer tube bundle 3.
[0018]
In addition, embodiment of this invention is not restricted to illustration, For example, it can take the following forms.
(1) The arrangement of the return bends 12 of the heat transfer tubes 11 can be arranged in a zigzag shape by selecting and combining the orthogonal bends in addition to the parallel and oblique to the headers 6 and 7.
(2) The vaporization of liquefied natural gas as the liquefied gas has been described. However, the present invention is not limited to this. For example, vaporized liquefied ethylene, LO 2 (liquefied oxygen), LN 2 (liquefied nitrogen), etc. It can also be applied to.
(3) Each header 6 and 7 is not restricted to what is arrange | positioned at the cover plate 4 side which is one end of the shell main body 2, It can also each arrange | position at both sides.
(4) The headers 6 and 7 can be formed by pipes, and can also be formed by partitioning a cylindrical body closed at both ends with a partition plate.
[0019]
【The invention's effect】
As described above, according to the present invention, since the shell main body is formed in a horizontal cylindrical shape, a reinforcing member such as a square shell is not necessary, the product weight can be reduced, and the cost can be reduced. In addition, each heat transfer tube of the heat transfer tube bundle can be effectively arranged in the cylindrical cross section of the shell body by arranging the return bend including the slant, and the vaporizer including the shell body can be downsized.
Thereby, the installation area of the hot water bath type vaporizer can be reduced, the full water weight can be reduced, and the basic weight can also be reduced.
Furthermore, it can be installed simply by supporting the circumference of the shell body, and the insulation work can be performed on the shell body even after installation, improving the local workability and maintainability.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view showing a hot water bath type vaporizer according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is an enlarged perspective view showing an arrangement mode of heat transfer tubes of the heat transfer tube bundle in FIGS. 1 and 2;
FIG. 4 is a cross-sectional front view showing a conventional hot water bath type vaporizer.
5 is a cross-sectional view taken along the line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water bath 2 Shell main body 3 Heat transfer tube bundle 11 Heat transfer tube 12 Return bend 15 Current plate 16 Current plate

Claims (2)

温水バスを形成するシェル本体内に、温水と熱交換して液化ガスを蒸発させる伝熱管束を設け、この伝熱管束を、端部に複数の１８０°リターンベンドを有する多パスの伝熱管を多数列並べて形成してなる温水バス式気化器において、
前記シェル本体を水平円筒型にし、前記円筒の軸方向から見て、前記伝熱管束の前記伝熱管が円筒断面内に有効に配置できるように前記リターンベンドを斜めを含む配置にするとともに、
前記リターンベンドにより多パスの伝熱管の各列が上下に配置されて前記伝熱管束が形成され、前記水平円筒の両側面に一対の整流板が設けられることを特徴とする温水バス式気化器。A heat transfer tube bundle that exchanges heat with hot water to evaporate the liquefied gas is provided in the shell body forming the hot water bath, and this heat transfer tube bundle is provided with a multi-pass heat transfer tube having a plurality of 180 ° return bends at the ends. In the hot water bath type vaporizer formed by arranging multiple rows,
The shell body has a horizontal cylindrical shape, and when viewed from the axial direction of the cylinder, the return bend is disposed so as to include an angle so that the heat transfer tubes of the heat transfer tube bundle can be effectively disposed in a cylindrical cross section.
The hot water bath carburetor is characterized in that rows of multi-pass heat transfer tubes are vertically arranged by the return bend to form the heat transfer tube bundle, and a pair of rectifying plates are provided on both side surfaces of the horizontal cylinder. . 前記一対の整流板の少なくとも一方が前記温水の堰板と兼用されていることを特徴とする請求項１に記載の温水バス式気化器。The hot water bath type vaporizer according to claim 1 , wherein at least one of the pair of rectifying plates is also used as the hot water dam plate.
JP2000014231A 2000-01-20 2000-01-20 Hot water bath vaporizer Expired - Lifetime JP3965012B2 (en)

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JP2010038330A (en) * 2008-08-07 2010-02-18 Kobe Steel Ltd Hot water bath type vaporizer
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