JPH0432281B2 - - Google Patents
Info
- Publication number
- JPH0432281B2 JPH0432281B2 JP63172244A JP17224488A JPH0432281B2 JP H0432281 B2 JPH0432281 B2 JP H0432281B2 JP 63172244 A JP63172244 A JP 63172244A JP 17224488 A JP17224488 A JP 17224488A JP H0432281 B2 JPH0432281 B2 JP H0432281B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- droplets
- spiral
- liquid
- thin wire
- 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 - Lifetime
Links
- 238000001704 evaporation Methods 0.000 claims description 10
- 230000008020 evaporation Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008034 disappearance Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012966 insertion method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
【発明の詳細な説明】
イ 発明の目的
産業上の利用分野：
本発明はボイラや各種の蒸気発生装置に用いら
れる蒸発管に関するものであり、主として貫流型
と称される気液分離部のない蒸気発生装置に利用
される。Detailed Description of the Invention A. Purpose of the Invention Industrial Application Field: The present invention relates to an evaporation tube used in boilers and various steam generators, and mainly relates to a once-through type evaporation tube without a gas-liquid separation section. Used in steam generators.
従来の技術：
従来の蒸気発生装置では、内面が平滑な蒸発管
が状されている。これらの平滑管では、発生蒸気
中に多量の液滴が混入し、伝熱面に接する液体の
消失が早まるため伝熱性能を劣化させる欠点があ
る。また、蒸気中に多量の液滴が混入すると、こ
の湿り蒸気を作動流体とする機器の性能低下や材
料腐食の原因となる。このため、これらの蒸気中
の液滴を完全に蒸発させる目的で、過大な伝熱面
積を必要としている。Conventional technology: A conventional steam generator has an evaporation tube with a smooth inner surface. These smooth tubes have the disadvantage that a large amount of liquid droplets are mixed into the generated steam, which accelerates the disappearance of the liquid in contact with the heat transfer surface, which deteriorates the heat transfer performance. In addition, if a large amount of droplets are mixed into the steam, it will cause performance degradation and material corrosion of equipment that uses this wet steam as a working fluid. Therefore, in order to completely evaporate these droplets in the vapor, an excessively large heat transfer area is required.
発明が解決しようとする課題：
従来の技術で性能を著しく低下させる要因はド
ライアウトと称される現象にある。これは、液体
が蒸発管内を流れる過程において蒸発が進行し、
蒸気の割合が多くなり管中央部での流速が高くな
るにつれ、管の内壁面上を流れる液膜から多量の
液体がはぎ取られ、このため蒸発による液膜の消
失が早まつて壁面が乾く現象である。Problems to be Solved by the Invention: A factor that significantly degrades performance in conventional technology is a phenomenon called dryout. This is because evaporation progresses as the liquid flows through the evaporation tube.
As the proportion of vapor increases and the flow velocity at the center of the tube increases, a large amount of liquid is stripped away from the liquid film flowing on the inner wall of the tube, which accelerates the disappearance of the liquid film due to evaporation and causes the wall to dry out. It is a phenomenon.
一方、蒸発管として開発されたもののうち、本
件に構造滴に似通つたものとしては、例えば高温
高圧ボイラで熱負荷（単位時間、面積当りの熱通
過量）の高い部分に用いられる内面ら旋溝付ボイ
ラ管がある。 On the other hand, among those developed as evaporation tubes, those with a structure similar to the present case include, for example, those with internal spirals used in high-temperature, high-pressure boilers where the heat load (heat passing amount per unit time and area) is high. There is a grooved boiler tube.
Swenson，H.S.，et.al，Trans.ASME，Eng，
for Power，84，（1962−10），365.
この蒸発管は、比較的高熱負荷の場合の伝熱劣
化現象の改善を対象としたもので、本発明とは目
的が異なる。また、構造的には管内面の加工が困
難で経済的に高価となるなどの問題がある。 Swenson, HS, et.al, Trans.ASME, Eng.
for Power, 84, (1962-10), 365. This evaporator tube is aimed at improving the heat transfer deterioration phenomenon in the case of a relatively high heat load, and its purpose is different from that of the present invention. In addition, there are structural problems such as difficulty in machining the inner surface of the tube and making it economically expensive.
以上要するに、本件が解決しようとする課題
は、管内での製作が比較的容易な手法によつて、
上記の液滴の発生を効果的に抑制することであ
る。 In summary, the problem that this case seeks to solve is to use a method that is relatively easy to manufacture in-house.
The objective is to effectively suppress the generation of the droplets mentioned above.
ロ 発明の構成
課題点を解決するための手段：
本発明で用いた手段は、伝熱管内面に流れ方向
に対して交差する方向に細線を挿入することであ
り、特にら旋状に配置することである。B. Means for solving the problems that constitute the invention: The means used in the present invention is to insert thin wires into the inner surface of the heat exchanger tube in a direction crossing the flow direction, and in particular, to arrange them in a spiral shape. It is.
作 用：
第１図は上記の手段による作用を説明したもの
であり、液膜からの液滴発生の過程（１−１）な
らびに細線挿入時の液膜流の状況（１−２）を示
している。図中、１は伝熱管、２は細線を示す。
液滴３は、高速の蒸気流４によつて液膜流５が引
つ張られる際、その界面に生じる波６の先端から
発生する。（１−１）。Effect: Figure 1 explains the effect of the above means, and shows the process of droplet generation from the liquid film (1-1) and the situation of the liquid film flow when inserting the thin wire (1-2). ing. In the figure, 1 indicates a heat exchanger tube, and 2 indicates a thin wire.
The droplet 3 is generated from the tip of a wave 6 generated at the interface when the liquid film flow 5 is pulled by the high-speed vapor flow 4 . (1-1).
そこで、先のら線を挿入すると液は細線間の溝
に充満して流れるため、波が細線と衝突すること
によつて消滅し、液膜の表面が比較的平坦になつ
て液滴の発生が抑制される（１−２）。 Therefore, when the tip of the spiral wire is inserted, the liquid fills the grooves between the thin wires and flows, so the waves collide with the thin wires and disappear, making the surface of the liquid film relatively flat and forming droplets. is suppressed (1-2).
一方、製作面から考えると、細線として金属や
プラステイクなどの弾性のある材料を用いること
によつて、管壁に密着させることができるため、
管内面を加工することなく比較的容易に設けるこ
とができる。 On the other hand, from a manufacturing perspective, by using elastic materials such as metal or plastic as the thin wire, it is possible to make it adhere tightly to the pipe wall.
It can be provided relatively easily without machining the inner surface of the tube.
実施例：
第２図は本発明の実施例を示したものである。
(a)平滑な蒸発管の内面に挿入する細線の断面は、
円形、長方形、三角形などが考えられ、断面寸法
も大小が考えられる。ただし、液滴発生を抑制す
るのに充分な直径を確保する必要がある。(b)材質
は弾性のある金属やプラステイクなどが使用可能
である。(c)ら旋状に挿入する場合のら旋条数、ら
旋ピツチの値は多くの組合せが考えられる。ま
た、(d)挿入方法は必要な箇所に局部的に設ける場
合、全長に渡る場合が考えられる。Embodiment: FIG. 2 shows an embodiment of the present invention.
(a) The cross section of the thin wire inserted into the smooth inner surface of the evaporation tube is
Circular, rectangular, triangular, etc. can be considered, and cross-sectional dimensions can also be large or small. However, it is necessary to ensure a sufficient diameter to suppress droplet generation. (b) The material can be elastic metal or plastic. (c) In the case of spiral insertion, many combinations of the number of spiral threads and the value of the spiral pitch can be considered. In addition, (d) the insertion method can be considered to be either localized at the required location or over the entire length.
ハ 発明の効果
本発明によつて、管内面上の液膜表面を平坦化
し、液滴の発生を抑制することができる。これに
よつて、発生蒸気中に含有する液滴の量を低減さ
せることがてきるとともに、小型の蒸気発生装置
を製作することが可能となる。C. Effects of the Invention According to the present invention, the surface of the liquid film on the inner surface of the tube can be flattened and the generation of droplets can be suppressed. This makes it possible to reduce the amount of droplets contained in the generated steam and to manufacture a small-sized steam generator.
第３図は液滴発生抑制効果の例を示したもの
で、縦軸は全液量に対する発生液滴量の割合Ｅ
（％）、横軸は蒸気流速Ug（ｍ／ｓ）である。図
中、▽印は内径19.5mmの管に直径3.2mmの細線を
条数４本、ピツチ500mmのら旋状に挿入した場合、
◇印は２mmx2.5mmの長方形断面の細線を条数８
本、ピツチ1000mmで挿入した場合であり、○印で
示す平滑管と比較して液滴発生量が現象し、最小
で約1/2になつていることが判る。なお、複数の
データは実験回数を示している。 Figure 3 shows an example of the effect of suppressing droplet generation, and the vertical axis is the ratio E of the amount of generated droplets to the total amount of liquid.
(%), and the horizontal axis is the steam flow rate Ug (m/s). In the figure, the mark ▽ indicates the case where 4 thin wires with a diameter of 3.2 mm are inserted in a spiral shape with a pitch of 500 mm into a tube with an inner diameter of 19.5 mm.
◇marked is 8 thin wires with a rectangular cross section of 2 mm x 2.5 mm.
This is the case when the tube is inserted with a pitch of 1000 mm, and it can be seen that the amount of droplets generated has changed compared to the smooth tube indicated by the circle, and is approximately 1/2 at the minimum. Note that multiple pieces of data indicate the number of experiments.
第１図本発明の作用を説明する図、１−１液滴
の発生過程を説明する図、１−２細線挿入時の状
況を示す図、第２図本発明の実施例を説明する
図、ａ……細線の断面形状、断面寸法の変化、ｂ
……細線挿入時のら旋条新、ら旋ピツチの変化、
ｃ……ら旋状細線の設置例、第３図本発明の効果
を示す図。
１……伝熱管、２……細線、３……液滴、４…
…蒸気流、５……液膜流、６……界面波。
Figure 1: A diagram explaining the action of the present invention; 1-1: A diagram explaining the process of droplet generation; 1-2: A diagram showing the situation when thin wires are inserted; Figure 2: A diagram explaining an embodiment of the present invention; a... Change in cross-sectional shape and cross-sectional dimension of thin wire, b
...New spiral rifling, change in spiral pitch when inserting thin wire,
c...Example of installation of spiral thin wire, Figure 3 is a diagram showing the effect of the present invention. 1...Heat transfer tube, 2...Thin wire, 3...Droplet, 4...
...vapor flow, 5...liquid film flow, 6...interfacial wave.
Claims (1)
細線を、管の内面に流れ方向に対して交差する方
向に設けた蒸発管。 ２ 前記の細線をら旋状に配置した請求項１の記
載の蒸発管。[Scope of Claims] 1. An evaporation tube in which a thin wire having a diameter sufficient to suppress droplet generation is provided on the inner surface of the tube in a direction perpendicular to the flow direction. 2. The evaporation tube according to claim 1, wherein the thin wires are arranged in a spiral shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17224488A JPH0221103A (en) | 1988-07-11 | 1988-07-11 | Inner radial small lines-inserted vaporization pipe designed to inhibit the generation of droplets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17224488A JPH0221103A (en) | 1988-07-11 | 1988-07-11 | Inner radial small lines-inserted vaporization pipe designed to inhibit the generation of droplets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0221103A JPH0221103A (en) | 1990-01-24 |
| JPH0432281B2 true JPH0432281B2 (en) | 1992-05-28 |
Family
ID=15938290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17224488A Granted JPH0221103A (en) | 1988-07-11 | 1988-07-11 | Inner radial small lines-inserted vaporization pipe designed to inhibit the generation of droplets |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0221103A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001043221A1 (en) * | 1999-12-06 | 2001-06-14 | Com Dev Limited | Quasi dual-mode resonators |
| JP4870491B2 (en) * | 2005-07-27 | 2012-02-08 | 富士電機株式会社 | Fuel reformer |
| EP1793164A1 (en) | 2005-12-05 | 2007-06-06 | Siemens Aktiengesellschaft | Steam generator tube, method of manufacturing the same and once-through steam generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57139202U (en) * | 1981-02-23 | 1982-08-31 |
-
1988
- 1988-07-11 JP JP17224488A patent/JPH0221103A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0221103A (en) | 1990-01-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |