JPH01279741A - Heat exchange device - Google Patents
Heat exchange deviceInfo
- Publication number
- JPH01279741A JPH01279741A JP10945888A JP10945888A JPH01279741A JP H01279741 A JPH01279741 A JP H01279741A JP 10945888 A JP10945888 A JP 10945888A JP 10945888 A JP10945888 A JP 10945888A JP H01279741 A JPH01279741 A JP H01279741A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- alumina whiskers
- heat
- alumina
- heat exchange
- 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.)
- Pending
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000003647 oxidation Effects 0.000 claims abstract description 20
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 20
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 18
- 239000010935 stainless steel Substances 0.000 claims abstract description 18
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 16
- 239000000463 material Substances 0.000 abstract description 9
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000005855 radiation Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000010953 base metal Substances 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000010420 art technique Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
- F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2245/00—Coatings; Surface treatments
- F28F2245/06—Coatings; Surface treatments having particular radiating, reflecting or absorbing features, e.g. for improving heat transfer by radiation
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は、耐食性に優れ、しかも伝熱特性に浸れた熱交
換器装置に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a heat exchanger device with excellent corrosion resistance and excellent heat transfer properties.
従来の技術
加熱炉内に設けられた伝熱管を有するラジアントチュー
ブ式熱交換器、および液体に伝熱管が浸漬されて液体を
加熱するための浸管式熱交換器では、伝熱管内にはガス
バーナからの高温度のガスが導かれ、熱交換を行うよう
に構成される。伝熱管は、鋳鉄製またはステンレス鋼製
であり、したがって熱をよく放射する遠赤外線域の放射
率が低いので、加熱効率が悪いという問題がある。Conventional technology In radiant tube heat exchangers that have heat transfer tubes installed in a heating furnace, and in immersion tube heat exchangers that heat the liquid by immersing the heat transfer tubes in a liquid, a gas burner is installed in the heat transfer tubes. The high-temperature gas from is directed and configured to perform heat exchange. Heat exchanger tubes are made of cast iron or stainless steel, and therefore have a low emissivity in the far infrared region where heat is well radiated, resulting in a problem of poor heating efficiency.
また給湯器などにおいて、−収約に広く利用されている
伝熱管は、バーナからの高温度の排ガスの通路に突出し
たフィンを有し、この伝熱管内に、加熱されるべき水道
水などの水が供給されて加熱される。伝熱管は、銅の表
面に亜鉛めっきされて構成される。Heat transfer tubes, which are widely used in water heaters and the like, have fins that protrude into the passage of high-temperature exhaust gas from the burner. Water is supplied and heated. The heat exchanger tube is constructed by galvanizing the surface of copper.
上述のラジアントチューブ式熱交換器、浸管式熱交換器
および給湯器では、伝熱管の表面は平滑であり、したが
って伝熱面積をもつと大きくして熱伝導効率を向上する
ことが望まれる。またこれらの先行技術では、腐食によ
って発錆しやすいという問題がある。In the above-mentioned radiant tube heat exchanger, immersion tube heat exchanger, and water heater, the surfaces of the heat transfer tubes are smooth, and therefore, it is desirable to increase the heat transfer area to improve heat transfer efficiency. Furthermore, these prior art techniques have a problem in that they are susceptible to rusting due to corrosion.
発明が解決すべき課題
本発明の目的は、耐食性に優れ、しかも伝熱特性が良好
である改良された熱交換装置を提供することである。Problems to be Solved by the Invention An object of the present invention is to provide an improved heat exchange device that has excellent corrosion resistance and good heat transfer characteristics.
課題を解決するための手段
本発明は、Ｆ ｅ−Ｃｒ−Ａｌステンレス鋼の少なくと
も一方表面に、酸化処理によって生成させたアルミナウ
ィスカを有することを特徴とする熱交換装！である。Means for Solving the Problems The present invention provides a heat exchange device characterized by having alumina whiskers produced by oxidation treatment on at least one surface of Fe-Cr-Al stainless steel! It is.
好ましい実施態様では、ステンレス鋼は、Ｃｒ１２〜２
８重量％、Ａ１１〜８重量％を含有することを特徴とす
る。In a preferred embodiment, the stainless steel is Cr12-2
8% by weight and A11 to 8% by weight.
また好ましい実施態様では、アルミナウィスカは、０．
１μｍ以上の長さを有することを特徴とする。Also in a preferred embodiment, the alumina whiskers are 0.
It is characterized by having a length of 1 μm or more.
さらに好ましい実施態様では、アルミナウィスカは、２
μｍ以上の長さを有することを特徴とする。In a further preferred embodiment, the alumina whiskers are 2
It is characterized by having a length of μm or more.
作 用
本発明に従えば、Ｆｅ−Ｃｒ−Ａｌステンレス鋼の少な
くとも一方表面に、アルミナウィスカが形成されており
、これによってアルミナの特性によって耐食性が向上さ
れる。Function According to the present invention, alumina whiskers are formed on at least one surface of the Fe-Cr-Al stainless steel, thereby improving corrosion resistance due to the characteristics of alumina.
しかも、このアルミナウィスカによってステンレス鋼の
、前記一方表面の表面積が格段に増大し、熱伝導効率を
向上することができる。In addition, the alumina whiskers significantly increase the surface area of the one surface of the stainless steel, thereby improving heat conduction efficiency.
しかも、このアルミナウィスカによって遠赤外線域にお
ける熱放射が行われ、熱交換効率を向上することができ
る。Moreover, the alumina whiskers radiate heat in the far infrared region, thereby improving heat exchange efficiency.
実施例
第１［Ｕは、本発明の一実施例のラジアントチューブ式
熱交換器の断面図である。炉体１内の加熱領域２には、
伝熱管であるラジアントチューブ３が設けられ、このラ
ジアントチューブ３の一端部には、ガスバーナ４が取付
けられる。ガスバーナ４からの高温度のガスは、ラジア
ントチューブ３内に供給され、他端部５から排出される
。Embodiment 1 [U is a sectional view of a radiant tube heat exchanger according to an embodiment of the present invention. In the heating area 2 in the furnace body 1,
A radiant tube 3 that is a heat transfer tube is provided, and a gas burner 4 is attached to one end of the radiant tube 3. High temperature gas from the gas burner 4 is supplied into the radiant tube 3 and discharged from the other end 5.
第２図は、ラジアントチューブ３の一部の拡大断面図で
ある。このラリアントチューブ３は。FIG. 2 is an enlarged sectional view of a portion of the radiant tube 3. FIG. This Lariant Tube 3.
Ｆｅ−Ｃｒ−Ａｌステンレス鋼を母材６とし、この母材
６の表面にＶ＆細な突起状のアルミナウィスカ７が形成
される。Fe--Cr--Al stainless steel is used as the base material 6, and alumina whiskers 7 in the shape of V&fine projections are formed on the surface of the base material 6.
母材６となるＦ ｅ−Ｃｒ−Ａｌステンレス鋼の成分は
次のように限定され、下記のような表面性状を有する。The components of the Fe-Cr-Al stainless steel serving as the base material 6 are limited as follows, and it has the following surface properties.
Ｃｒ：
Ｃｒはステンレス鋼の必須元素であり、１２重量％未満
では耐食性、耐酸化性がなくなる。またＣｒが２８重１
％を超えると、鋼が脆くなり、放射体に加工できなくな
るので１２重量％以上、２８重量％以下に限定する。Cr: Cr is an essential element for stainless steel, and if it is less than 12% by weight, corrosion resistance and oxidation resistance are lost. Also, Cr is 28 times 1
%, the steel becomes brittle and cannot be processed into a radiator, so it is limited to 12% by weight or more and 28% by weight or less.
Ａｌ ：
１．０重皿％未満では高温酸化処理で形成される酸化皮
膜が、Ｆｅ、Ｃｒ酸化物主木となり、アルミナウィスカ
が生成されず、また耐食性がなくなる。ＡＩが多いほど
、本発明の目的を達成することができるが、８．０重量
％を超えると鋼が脆くなり、ｍ［の製造が困難となるた
め、１．０重量％以上、８．０重量％以下に限定する。Al: If the content is less than 1.0%, the oxide film formed by high-temperature oxidation treatment will become the main structure of Fe and Cr oxides, no alumina whiskers will be generated, and corrosion resistance will be lost. The more AI there is, the more the object of the present invention can be achieved. However, if it exceeds 8.0% by weight, the steel becomes brittle and it becomes difficult to manufacture m [. Limited to % by weight or less.
次に大気などの酸化性雰囲気中で８５０〜１０００℃で
１時間以上保持して高温酸化処理を行い、表面に長さ０
．１μｍ以上のアルミナウィスカを形成させる。Next, high-temperature oxidation treatment is performed by holding the temperature at 850 to 1000°C for more than 1 hour in an oxidizing atmosphere such as the air, and the surface has a length of 0.
．． Alumina whiskers of 1 μm or more are formed.
この高温酸化処理温度は、８５０℃未満または１０００
℃を超えると、アルミナウィスカが形成されず、酸化皮
膜は平滑なアルミナになり遠赤外線放射特性が得られな
いため、８５０℃以上１０００℃以下に限定する。また
処理時間は１時間以上とする。１時間未満の酸化処理で
はアルミナウィスカの長さが０．１μｍ以上にならない
ので、１時間以上とする。This high temperature oxidation treatment temperature is less than 850°C or 1000°C.
When the temperature exceeds 850°C and 1000°C or less, no alumina whiskers are formed and the oxide film becomes smooth alumina, making it impossible to obtain far-infrared radiation characteristics. Furthermore, the processing time is 1 hour or more. If the oxidation treatment is carried out for less than 1 hour, the length of the alumina whiskers will not become 0.1 μm or more, so the oxidation treatment is carried out for 1 hour or more.
ただし、鋼板のＡＩ含有量が３重量％未満の場合、高温
酸化処理のみではアルミナウィスカの長さが短く、密度
が低いことがある。このときには予備酸化処理として、
酸素濃度０．１％以下の雰囲気中に７００〜１０００℃
で１０秒以上熱処理すると、鋼板表面に厚さ１０００人
未溝０高純度のアルミナ酸化皮膜が形成され、次に上記
高温酸化処理を行うとアルミナウィスカが生成しやすく
なる。However, if the AI content of the steel sheet is less than 3% by weight, the length of the alumina whiskers may be short and the density may be low if only high-temperature oxidation treatment is performed. At this time, as a preliminary oxidation treatment,
700-1000℃ in an atmosphere with an oxygen concentration of 0.1% or less
When the steel plate is heat treated for 10 seconds or more, a 1,000-thick, non-grooved, high-purity alumina oxide film is formed on the surface of the steel sheet, and when the high temperature oxidation treatment is performed next, alumina whiskers are likely to be generated.
上記予備酸化処理においては、雰囲気中の酸素濃度が０
．１％を超えると酸化皮膜にＦｅ？Ｃｒが混入し、アル
ミナウィスカが形成しなくなるので０．１％以下とする
。また７ ００ ”Ｃ未満や１０秒間未満では生成酸化
皮膜が薄いので効果がなく、１０００℃を超えると鋼板
の結晶粒が粗大化して脆くなり、加工することが不可能
となるので７００〜１０００℃で１０秒以上に限定する
。In the above preliminary oxidation treatment, the oxygen concentration in the atmosphere is 0.
．． If it exceeds 1%, Fe? Since Cr is mixed in and alumina whiskers are not formed, the content is set to 0.1% or less. Furthermore, if the temperature is less than 700"C or for less than 10 seconds, the formed oxide film will be too thin and it will not be effective. If the temperature exceeds 1000℃, the crystal grains of the steel plate will become coarse and brittle, making it impossible to process. limited to 10 seconds or more.
本発明に用いるＦｅ−Ｃｒ−Ａｌステンレス鋼の成分Ｃ
，Ｓｉ、およびＭ ｒ＋は、次のように定められる。Component C of Fe-Cr-Al stainless steel used in the present invention
, Si, and M r+ are defined as follows.
Ｃ： Ｃは母材および溶接部の靭性および延性を劣化させる。C: C deteriorates the toughness and ductility of the base metal and weld.
このため本発明の素材を製造する過程で、板切れ、耳割
れ、曲げ割れを生じ、著しく製造性を損なう。そのため
Ｃを０．０３重量％以下に限定する。Therefore, in the process of manufacturing the material of the present invention, plate breaks, edge cracks, and bending cracks occur, which significantly impairs productivity. Therefore, C is limited to 0.03% by weight or less.
Ｓｉ：
Ｓｔは高温の耐酸化性を向上させるが、母材および溶接
部の延性を著しく阻害するので、１．０重厘％以下に限
定する。Si: Although St improves high-temperature oxidation resistance, it significantly impedes the ductility of the base metal and weld zone, so it is limited to 1.0% by weight or less.
Ｍｎ、
Ｍｎは母材および溶接部の靭性含劣化させ、かつ高温で
耐酸化性を損なうので、１．０重量％以下に限定する。Mn and Mn deteriorate the toughness of the base metal and the weld zone and impair oxidation resistance at high temperatures, so it is limited to 1.0% by weight or less.
一般にＦｅ−Ｃｒ−Ａｌステンレス鋼には鋼板の靭性を
高め製造しやすくするためと、耐酸化性を向上させる目
的で０．５重量％までのＴｉ、Ｎｂ、Ｚｒを添加したり
、酸化皮膜の耐剥離性を向上させる目的で０．３重量％
までのＹ、Ｃｅ、Ｌａ、Ｎｄなどの希土類元素を添加し
たりするが、これらの元素を添加したＦｅ−Ｃｒ−Ａｌ
ステンレス鋼も本発明に好適である。Generally, up to 0.5% by weight of Ti, Nb, or Zr is added to Fe-Cr-Al stainless steel to increase the toughness of the steel sheet and make it easier to manufacture, and to improve oxidation resistance. 0.3% by weight for the purpose of improving peeling resistance
Rare earth elements such as Y, Ce, La, and Nd are added to Fe-Cr-Al with these elements added.
Stainless steel is also suitable for the present invention.
こうして、第２図のようにアルミナウィスカ７の長さａ
を前述のように０．１μｍ以上に選ぶことによって、遠
赤外線域の放射特性が飛躍的に向上し、加熱効率を向上
することができる。しかもアルミナウィスカによって、
伝熱面積を飛躍的に増加させることができ、熱伝導が向
上する。しかもこのアルミナウィスカから成る皮膜によ
って、耐食性が向上し、高温度による酸化および温良、
腐食を防止することができる。In this way, as shown in Fig. 2, the length a of the alumina whisker 7 is
By selecting 0.1 μm or more as described above, the radiation characteristics in the far infrared region can be dramatically improved, and the heating efficiency can be improved. Moreover, due to alumina whiskers,
The heat transfer area can be dramatically increased, improving heat conduction. Moreover, this film made of alumina whiskers improves corrosion resistance, prevents oxidation caused by high temperatures,
Corrosion can be prevented.
第３図は、本発明の他の実施例の浸管式熱交換器の断面
図である。被加熱液体８を貯留した層９内に、本発明に
従って外表面にアルミナウィスカが形成された伝熱管１
０が浸漬され、この伝熱管１０の一端部にガスバーナ１
１が接続され、排ガスは他端部１２から排出される。伝
熱管１０の内周面にもアルミナウィスカを生成させて、
（天熱効率を向上させることができるとともに、被加熱
液体８によるＩＫ食を防止することができる。FIG. 3 is a sectional view of an immersion tube heat exchanger according to another embodiment of the present invention. A heat exchanger tube 1 in which alumina whiskers are formed on the outer surface according to the present invention in a layer 9 in which a liquid to be heated 8 is stored.
0 is immersed, and a gas burner 1 is installed at one end of this heat transfer tube 10.
1 is connected, and exhaust gas is discharged from the other end 12. Alumina whiskers are also generated on the inner peripheral surface of the heat exchanger tube 10,
(It is possible to improve the natural heat efficiency and prevent IK eating by the heated liquid 8.
第４図は、給湯器などに用いられるフィン１３を有する
伝熱管１４の断面図である。この伝熱管１４の内周面に
、本発明に従ってアルミナウィスカを形成する。伝熱管
１４内には、被加熱流体であるたとえば水が供給され、
伝熱管１４の外部には、ガスバーナなどからの高温度の
ガスが導かれる。アルミナウィスカを伝熱管１４の内周
面に形成することによって、伝熱効率を向上させること
ができ、また被加熱流体による腐食を防止することがで
きる。FIG. 4 is a sectional view of a heat transfer tube 14 having fins 13 used in water heaters and the like. Alumina whiskers are formed on the inner peripheral surface of the heat exchanger tube 14 according to the present invention. A fluid to be heated, such as water, is supplied into the heat exchanger tube 14,
High temperature gas from a gas burner or the like is guided to the outside of the heat exchanger tube 14 . By forming alumina whiskers on the inner circumferential surface of the heat transfer tube 14, heat transfer efficiency can be improved and corrosion caused by the heated fluid can be prevented.
本件発明者による放射特性の実験結果を述べる。The experimental results of the radiation characteristics by the inventor of the present invention will be described.
Ｃｒ２Ｏ重量％、ＡＩ ５重量％を含有するＦｅ−Ｃｒ
−Ａｔ！ステンレス鋼を供試材として使用し、直径０．
３の鉄球によりブラスト処理も行った。Fe-Cr containing Cr2O wt%, AI 5wt%
-At! Stainless steel was used as the test material, and the diameter was 0.
Blasting treatment was also performed using the iron ball No. 3.
その結果、表面■度はＲａで１．０μｍとなった。As a result, the surface roughness Ra was 1.0 μm.
次に、大気雰囲気中で９２５℃で８時間保持すると、表
面に長さ２μｎ１以上のアルミナウィスカが形成された
。この試験片を４００℃に加熱し、波長３〜１５μｍの
赤外線放射強度を測定し、同一温度の黒体放射との比（
すなわち放射率）を求めると、０．８であった。比較材
として′、市販の５ＵＳ３０４ ＢＡ（光輝焼鈍）仕
上げを同温度で測定したところ、放射率は０．２であっ
た。Next, when it was held at 925° C. for 8 hours in the air, alumina whiskers with a length of 2 μn1 or more were formed on the surface. This test piece was heated to 400°C, the infrared radiation intensity at a wavelength of 3 to 15 μm was measured, and the ratio (
That is, the emissivity) was found to be 0.8. As a comparative material, commercially available 5US304 BA (bright annealing) finish was measured at the same temperature, and the emissivity was 0.2.
耐食性の実験結果について述べる。The experimental results of corrosion resistance will be described.
上述の放射特性の実験結果における試験片（Ｃｒ２０重
量％、Ａ１’５重量％を含有するＦｅ−Ｃｒ−Ａｌステ
ンレス鋼の表面に、アルミナウィスカを生成したもの）
に対して、日本工業規格ＪＩＳ ２２３７１の塩水噴
霧試験を７２０時間行ったところ、供試材には全く発錆
が見られなかった。これに対して、比較材（ＳＵＳ３０
４）には発錆が見られた。Test piece (with alumina whiskers generated on the surface of Fe-Cr-Al stainless steel containing 20% by weight of Cr and 5% by weight of A1') in the experimental results of the radiation characteristics described above.
On the other hand, when a salt spray test according to Japanese Industrial Standards JIS 22371 was conducted for 720 hours, no rust was observed in the sample material. On the other hand, comparative material (SUS30
4) Rust was observed.
本発明は、その他の熱交換などを行うための伝熱板とし
て、広範囲に実施することができる。The present invention can be widely implemented as a heat exchanger plate for performing other heat exchanges.
発明の効果
以上のように本発明によれば、遠赤外線域の放射特性を
向上することができるとともに、伝熱面積を向上して熱
伝導を向上させ、しかも耐食性が向上して、高温度にお
ける酸化および腐食などの防止を行うことができる。Effects of the Invention As described above, according to the present invention, radiation characteristics in the far infrared region can be improved, heat transfer area is increased to improve heat conduction, corrosion resistance is improved, and corrosion resistance is improved at high temperatures. It can prevent oxidation, corrosion, etc.
第１図は本発明の一実施例のラジアントチューブ式熱交
換器の断面図、第２図は第１図における伝熱管３の一部
の拡大断面図、第３１１Ｗは本発明の池の実施例の浸管
式熱交換器の断面図、第４図は給湯器などの熱交換器に
おけるフィン付き伝熱管１４の断面図である。
３・・・ラジアントチューブ、６・・・母材、７・・・
アルミナウィスカ、１０．１４・・・伝熱管代理人
弁理士 西教 圭一部
Ｍ ｌ 図
７、／３
Ｍ ３ 図
↑FIG. 1 is a cross-sectional view of a radiant tube heat exchanger according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a part of the heat exchanger tube 3 in FIG. 1, and No. 311W is an embodiment of a pond according to the present invention. FIG. 4 is a cross-sectional view of a finned heat exchanger tube 14 in a heat exchanger such as a water heater. 3...Radiant tube, 6...Base material, 7...
Alumina whisker, 10.14...heat exchanger tube agent
Patent attorney Keiichi Saikyo M l Figure 7, /3 M 3 Figure ↑
Claims (4)
表面に、酸化処理によつて生成させたアルミナウィスカ
を有することを特徴とする熱交換装置。(1) A heat exchange device characterized by having alumina whiskers produced by oxidation treatment on at least one surface of Fe-Cr-Al stainless steel.
〜８重量％を含有することを特徴とする特許請求の範囲
第１項記載の熱交換装置。(2) Stainless steel is Cr12-28% by weight, Al1
The heat exchange device according to claim 1, characterized in that the heat exchanger contains ~8% by weight.
することを特徴とする特許請求の範囲第１項記載の熱交
換装置。(3) The heat exchange device according to claim 1, wherein the alumina whisker has a length of 0.1 μm or more.
ことを特徴とする特許請求の範囲第１項記載の熱交換装
置。(4) The heat exchange device according to claim 1, wherein the alumina whisker has a length of 2 μm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10945888A JPH01279741A (en) | 1988-05-02 | 1988-05-02 | Heat exchange device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10945888A JPH01279741A (en) | 1988-05-02 | 1988-05-02 | Heat exchange device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01279741A true JPH01279741A (en) | 1989-11-10 |
Family
ID=14510744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10945888A Pending JPH01279741A (en) | 1988-05-02 | 1988-05-02 | Heat exchange device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01279741A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0247248A (en) * | 1988-08-05 | 1990-02-16 | Osaka Gas Co Ltd | Stainless steel sheet excellent in water-repelling property |
| WO2010093034A1 (en) * | 2009-02-16 | 2010-08-19 | 住友金属工業株式会社 | Method for producing metal tube |
| WO2010113830A1 (en) * | 2009-03-31 | 2010-10-07 | 株式会社クボタ | Cast product having alumina barrier layer |
| WO2017208342A1 (en) * | 2016-05-31 | 2017-12-07 | 三菱電機株式会社 | Air conditioning device |
-
1988
- 1988-05-02 JP JP10945888A patent/JPH01279741A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0247248A (en) * | 1988-08-05 | 1990-02-16 | Osaka Gas Co Ltd | Stainless steel sheet excellent in water-repelling property |
| WO2010093034A1 (en) * | 2009-02-16 | 2010-08-19 | 住友金属工業株式会社 | Method for producing metal tube |
| JP4586938B2 (en) * | 2009-02-16 | 2010-11-24 | 住友金属工業株式会社 | Metal tube manufacturing method |
| JPWO2010093034A1 (en) * | 2009-02-16 | 2012-08-16 | 住友金属工業株式会社 | Metal tube manufacturing method |
| WO2010113830A1 (en) * | 2009-03-31 | 2010-10-07 | 株式会社クボタ | Cast product having alumina barrier layer |
| US8431230B2 (en) | 2009-03-31 | 2013-04-30 | Kubota Corporation | Cast product having alumina barrier layer |
| JP5451751B2 (en) * | 2009-03-31 | 2014-03-26 | 株式会社クボタ | Cast products having an alumina barrier layer |
| WO2017208342A1 (en) * | 2016-05-31 | 2017-12-07 | 三菱電機株式会社 | Air conditioning device |
| JPWO2017208342A1 (en) * | 2016-05-31 | 2018-12-13 | 三菱電機株式会社 | Air conditioner |
| GB2564363A (en) * | 2016-05-31 | 2019-01-09 | Mitsubishi Electric Corp | Air conditioning device |
| US10718547B2 (en) | 2016-05-31 | 2020-07-21 | Mitsubishi Electric Corporation | Air-conditioning apparatus having a drain sensor and associated compressor control |
| GB2564363B (en) * | 2016-05-31 | 2021-03-17 | Mitsubishi Electric Corp | Air-conditioning apparatus |
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