JPH071157B2 - Heat transfer tube for LNG vaporizer - Google Patents
Heat transfer tube for LNG vaporizerInfo
- Publication number
- JPH071157B2 JPH071157B2 JP16864290A JP16864290A JPH071157B2 JP H071157 B2 JPH071157 B2 JP H071157B2 JP 16864290 A JP16864290 A JP 16864290A JP 16864290 A JP16864290 A JP 16864290A JP H071157 B2 JPH071157 B2 JP H071157B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- heat transfer
- transfer tube
- lng vaporizer
- lng
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明はLNG気化器用伝熱管に関し、詳細には加熱媒体
として海水を用いるLNG気化器のAl合金製伝熱管に関す
るものである。The present invention relates to a heat transfer tube for an LNG vaporizer, and more particularly to an Al alloy heat transfer tube for an LNG vaporizer that uses seawater as a heating medium.
［従来の技術］ LNG（液化天然ガス）は通常ORV（オープン・ラック・ベ
ーパライザー）と称される熱交換器において海水等の加
熱により気化されNG（天然ガス）として利用される。[Prior Art] LNG (liquefied natural gas) is used as NG (natural gas) by being vaporized by heating seawater or the like in a heat exchanger usually called an ORV (open rack vaporizer).
第１図はORVの一部概略説明図であり、海水は海水ヘッ
ダ６から散水ノズル７を経てトラフ８に溜められ、該ト
ラフ８の両脇からパネル３の外面をつたって落下する。
一方LNGはLNGマニホールド１からLNGヘッダ２に送ら
れ、上記海水によって加熱されることによりパネル３内
で気化されて上昇し、NGヘッダ４からNGマニホールド５
へ導かれる。FIG. 1 is a partial schematic explanatory view of the ORV, in which seawater is stored in a trough 8 from a seawater header 6 through a sprinkler nozzle 7, and falls from both sides of the trough 8 along the outer surface of the panel 3.
On the other hand, LNG is sent from the LNG manifold 1 to the LNG header 2 and is vaporized and rises in the panel 3 by being heated by the seawater, and then the NG header 4 to the NG manifold 5
Be led to.
ところで上記パネルは縦形異形状の伝熱管が連結された
構造となっており、該伝熱管は異形管に成形するための
加工性や高い熱伝導性が要求されること等から、Al合金
を用いるのが一般的である。但しAl合金は海水環境下で
孔食を受けやすいので、伝熱管の防食を目的として、Al
合金よりも電位的に卑であるAl−Zn合金を伝熱管外部へ
溶射し、該Al−Zn合金の犠牲防食作用によって母材であ
るAl合金の保護が図られている。By the way, the above-mentioned panel has a structure in which heat transfer tubes of vertical irregular shape are connected, and since the heat transfer tube is required to have high workability and high thermal conductivity for forming a deformed tube, an Al alloy is used. Is common. However, since Al alloys are susceptible to pitting corrosion in seawater environments, Al alloys are used to prevent corrosion of heat transfer tubes.
An Al-Zn alloy, which is more base potential than the alloy, is sprayed to the outside of the heat transfer tube, and the Al-Zn alloy, which is the base material, is protected by the sacrificial anticorrosion action of the Al-Zn alloy.
［発明が解決しようとする課題］ しかしながら加熱媒体である海水中には種々の理由によ
りCu2+やHg2+などの混入が避けられず、このような重金
属イオンが微量でも混入すると、Al−Zn合金製溶射膜が
極めて早期に腐食し、短時間に溶射膜が剥離して母材の
浸食に到るという問題が発生している。[Problems to be Solved by the Invention] However, it is unavoidable to mix Cu 2+ , Hg 2+, etc. in seawater as a heating medium for various reasons. There is a problem that the Zn alloy sprayed film is corroded very early and the sprayed film is peeled off in a short time, leading to erosion of the base material.
本発明は上記事情に着目してなされたものであって、Cu
2+やHg2+等の重金属イオンの存在下であっても、優れた
耐食性を発揮するAl合金製伝熱管を提供しようとするも
のである。The present invention has been made in view of the above circumstances, and Cu
The present invention aims to provide an Al alloy heat transfer tube that exhibits excellent corrosion resistance even in the presence of heavy metal ions such as 2+ and Hg 2+ .
［課題を解決するための手段］ 上記目的を達成した本発明のLNG気化器用伝熱管とは、L
NG気化器用Al合金製伝熱管の表面にAl−Zn合金層が形成
され、さらにその表面にIn,Sn,Hg及びCdからなる群から
選ばれる１種または２種以上の元素を含むAl−Zn系合金
層が形成されたものであることを要旨とするものであ
る。[Means for Solving the Problems] A heat transfer tube for an LNG vaporizer of the present invention that achieves the above object is L
An Al-Zn alloy layer is formed on the surface of an Al alloy heat transfer tube for an NG vaporizer, and the surface of the Al-Zn alloy layer contains one or more elements selected from the group consisting of In, Sn, Hg and Cd. The gist is that the system alloy layer is formed.
［作用］ 本発明者らはLNG気化器における防食能力の向上につい
て鋭意研究を重ねた結果、Al合金製伝熱管の表面に形成
したAl−Zn合金溶射膜上に、In,Sn,Hg及びCdからなる群
から選ばれる１種または２種以上の元素を含むAl−Zn合
金の溶射膜を形成することによって、防食効果が著しく
高まることを見い出し本発明を完成させた。[Operation] As a result of intensive studies on the improvement of anticorrosion ability in the LNG vaporizer, the present inventors have found that In, Sn, Hg and Cd are formed on the Al-Zn alloy sprayed film formed on the surface of the Al alloy heat transfer tube. The present invention has been completed by finding that the anticorrosion effect is remarkably enhanced by forming a sprayed film of an Al-Zn alloy containing one or more elements selected from the group consisting of
本発明において最外層に形成される溶射膜はAl−Zn合金
中にIn,Sn,Hg及びCdからなる群から選ばれる１種または
２種以上の元素が含まれるが、本発明はZnの含有量及び
上記元素の含有量を限定するものではない。但し本発明
の効果をより確実に発揮する為にはZn含有量を０〜５％
とすることが好ましく、１〜３％とすることがより好ま
しい。The sprayed film formed in the outermost layer in the present invention contains one or more elements selected from the group consisting of In, Sn, Hg and Cd in the Al-Zn alloy, but the present invention contains Zn. It does not limit the amount and the content of the above elements. However, in order to more reliably exert the effects of the present invention, the Zn content is 0 to 5%.
It is preferable to be, and it is more preferable to be 1 to 3%.
またInの含有量は0.01〜0.1％が好ましく、0.01〜0.06
％がより好ましい。Snの場合0.001〜0.1％が好ましく、
0.01〜0.06％がより好ましい。Hgの含有量は0.001〜0.1
％が好ましく、0.001〜0.02％がより好ましい。Cdの場
合0.01〜１％が好ましく、0.01〜0.06％がより好まし
い。Further, the content of In is preferably 0.01 to 0.1%, 0.01 to 0.06
% Is more preferable. In the case of Sn, 0.001 to 0.1% is preferable,
0.01 to 0.06% is more preferable. Hg content is 0.001-0.1
% Is preferable, and 0.001 to 0.02% is more preferable. In the case of Cd, 0.01 to 1% is preferable, and 0.01 to 0.06% is more preferable.
［実施例］ 50×100×５（mm）のAl合金平板上に第１層としてAl−
２％Zn合金を約100μｍの厚さで溶射施工した後、その
上部に第２層としてCd,In,SnおよびHgよりなる群から選
択される１種または２種以上の元素を含むAl−Zn合金を
約100μｍの厚さで溶射し、封孔材としてシリコン樹脂
を含浸させ本発明に係る試験片とした。[Example] On a 50 x 100 x 5 (mm) Al alloy flat plate, the first layer of Al-
After spraying a 2% Zn alloy with a thickness of about 100 μm, Al-Zn containing one or more elements selected from the group consisting of Cd, In, Sn and Hg as a second layer on top of it. The alloy was sprayed to a thickness of about 100 μm and impregnated with silicone resin as a sealing material to obtain a test piece according to the present invention.
該試験片を0.5ppmのCu2+を含む35℃の流動海水中に720
時間浸漬して、試験片の溶射膜の剥離状況を調べた。720 the test piece in flowing seawater at 35 ° C containing 0.5 ppm Cu 2+.
After immersion for a period of time, the peeling state of the sprayed film of the test piece was examined.
上記第２層の合金組成及び結果は第１表に示す。The alloy composition of the second layer and the results are shown in Table 1.
尚第２層としてZn又はAl−２％Zn合金を溶射した以外は
上記本発明試験片と同様にして比較例試験片を得た。浸
漬試験の結果は第１表に併記する。A comparative test piece was obtained in the same manner as the test piece of the present invention except that the second layer was sprayed with Zn or Al-2% Zn alloy. The results of the immersion test are also shown in Table 1.
No.1〜７は本発明に係る試験片であり、第２層にCd,In,
SnおよびHgよりなる群から選ばれる１種または２種以上
の元素を含むAl−Zn合金を溶射しているので、２層目の
溶射膜のみが一部剥離しただけであり、耐食性に優れて
いることがわかる。 Nos. 1 to 7 are test pieces according to the present invention, in which Cd, In,
Since the Al-Zn alloy containing one or more elements selected from the group consisting of Sn and Hg is sprayed, only the second sprayed film is partially peeled off, and it has excellent corrosion resistance. You can see that
一方No.8,9は２層目の溶射膜がZnまたはAl−Zn合金から
なる場合の比較例であり、１層目の溶射膜まで剥離が生
じており、耐食性に劣っている。On the other hand, Nos. 8 and 9 are comparative examples in the case where the second-layer sprayed film is made of Zn or Al—Zn alloy, and the first-layer sprayed film is peeled off, and the corrosion resistance is poor.
［発明の効果］ 本発明は以上の様に構成されているので、加熱媒体の海
水中にCu2+やHg2+等の重金属イオンが含まれる場合でも
高い耐食性を示すLNG気化器用伝熱管が提供できること
となった。EFFECTS OF THE INVENTION Since the present invention is configured as described above, a heat transfer tube for an LNG vaporizer that exhibits high corrosion resistance even when heavy metal ions such as Cu 2+ and Hg 2+ are contained in seawater as a heating medium is provided. It is now possible to provide.
第１図は代表的なLNG気化器であるORVの一部概略説明図
である。 １……LNGマニホールド ２……LNGヘッダ、３……パネル ４……NGヘッダ、５……NGマニホールド ６……海水ヘッダ、７……散水ノズル ８……トラフFIG. 1 is a partial schematic explanatory view of an ORV which is a typical LNG vaporizer. 1 …… LNG manifold 2 …… LNG header, 3 …… panel 4 …… NG header, 5 …… NG manifold 6 …… Seawater header, 7 …… Sprinkling nozzle 8 …… Trough
───────────────────────────────────────────────────── フロントページの続き (72)発明者 原田 福三 兵庫県明石市東野町2043―15―507 (72)発明者 藤原 和雄 兵庫県神戸市北区松ヶ枝町３―４―６ (56)参考文献 特開 平１−114698（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fukuzo Harada 2043-15-507 Higashino-cho, Akashi-shi, Hyogo Prefecture (72) Inventor Kazuo Fujiwara 3-4-6 Matsugae-cho, Kita-ku, Kobe-shi, Hyogo (56) ) References Japanese Patent Laid-Open No. 1-114698 (JP, A)
Claims (1)
n合金層が形成され、さらにその表面にIn,Sn,Hg及びCd
からなる群から選ばれる１種または２種以上の元素を含
むAl−Zn系合金層が形成されたものであることを特徴と
するLNG気化器用伝熱管。1. Al-Z on the surface of an Al alloy heat transfer tube for an LNG vaporizer.
An n-alloy layer is formed, and In, Sn, Hg and Cd are further formed on the surface.
A heat transfer tube for an LNG vaporizer, wherein an Al-Zn alloy layer containing one or more elements selected from the group consisting of is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16864290A JPH071157B2 (en) | 1990-06-26 | 1990-06-26 | Heat transfer tube for LNG vaporizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16864290A JPH071157B2 (en) | 1990-06-26 | 1990-06-26 | Heat transfer tube for LNG vaporizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0460393A JPH0460393A (en) | 1992-02-26 |
| JPH071157B2 true JPH071157B2 (en) | 1995-01-11 |
Family
ID=15871824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16864290A Expired - Fee Related JPH071157B2 (en) | 1990-06-26 | 1990-06-26 | Heat transfer tube for LNG vaporizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH071157B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017211141A (en) * | 2016-05-25 | 2017-11-30 | 株式会社神戸製鋼所 | Aluminum alloy member and LNG vaporizer |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6668562B1 (en) | 2000-09-26 | 2003-12-30 | Robert A. Shatten | System and method for cryogenic cooling using liquefied natural gas |
| JP4464762B2 (en) * | 2004-08-11 | 2010-05-19 | 株式会社神戸製鋼所 | Al alloy member for liquefied gas vaporizer with excellent corrosion resistance and liquefied gas vaporizer |
| CN107606791A (en) * | 2017-09-08 | 2018-01-19 | 湖南安盛能源化工有限责任公司 | A kind of industrial high-power methanol gasifying converter |
-
1990
- 1990-06-26 JP JP16864290A patent/JPH071157B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017211141A (en) * | 2016-05-25 | 2017-11-30 | 株式会社神戸製鋼所 | Aluminum alloy member and LNG vaporizer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0460393A (en) | 1992-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |