{"id":3886,"date":"2021-04-27T14:16:42","date_gmt":"2021-04-27T14:16:42","guid":{"rendered":"https:\/\/www.wldsteel.com\/?p=3886"},"modified":"2025-02-24T08:20:53","modified_gmt":"2025-02-24T08:20:53","slug":"the-commonly-used-material-for-condenser-tubes","status":"publish","type":"post","link":"https:\/\/www.wldsteel.com\/de\/das-meist-verwendete-material-fur-kondensatorrohre\/","title":{"rendered":"Das am h\u00e4ufigsten verwendete Material f\u00fcr Kondensatorrohre"},"content":{"rendered":"

The condenser is important auxiliary equipment in the thermal generator set. The condenser is generally composed of neck, casing, water chamber, tube bundle, tube plate, support rod, steam baffle, air cooling area, hot well and other parts, which is the key equipment to determine and affect the load and thermal efficiency of a steam turbine. The heat exchange tube, as the main heat transfer component of the condenser, is the key component of the condenser. With the increase of suspended solids, chloride ions and sulfur ions in the cooling circulating water, there is a higher requirement for a condenser cooling pipe.<\/p>\n\n\n\n

Condenser heat exchanger pipe should have excellent heat transfer performance, good corrosion resistance, erosion resistance and wear resistance, but also should have good strength and stiffness,\u00a0as well as economic and good processing performance.\u00a0The materials\u00a0of condenser heat exchange pipe are mainly copper alloy pipe, Austenitic stainless steel pipe, Ferrite stainless steel pipe, Duplex\u00a0stainless steel pipe, titanium and titanium alloy pipe<\/a>. The copper alloy pipe mainly includes military\u00a0brass pipe (C26800), tin-brass pipe, aluminum-brass pipe, nickel-copper pipe, etc.\u00a0Stainless steel grades mainly include\u00a0Austenitic stainless steel tube TP304, TP316L, TP317L and Ferrite stainless steel grades TP439, TP439L, and duplex stainless steel tube 2205, 2507, titanium and titanium alloy tube mainly includes GR1, GR2, GR5, etc..<\/p>\n\n\n\n

Materialien f\u00fcr Rohre<\/td>Profis<\/td>Nachteile<\/td><\/tr>
Kupferrohre<\/td>Gute Verarbeitungsleistung, moderater Preis<\/td>Geringe Toleranz gegen\u00fcber komplexer Wasserqualit\u00e4t, geringe Festigkeit, Steifigkeit und Schwei\u00dfbarkeit. <\/td><\/tr>
Austenitischer rostfreier Stahl<\/td>Ausgezeichnete Erosionsbest\u00e4ndigkeit, gute Festigkeit, Plastizit\u00e4t, Bearbeitbarkeit und Schwei\u00dfbarkeit<\/td>Cr-Ni Austenitischer rostfreier Stahl hat eine schlechte Best\u00e4ndigkeit gegen Chloridionenkorrosion<\/td><\/tr>
Ferrit Rostfreier Stahl<\/td>Hohe W\u00e4rmeleitf\u00e4higkeit, kleiner Ausdehnungskoeffizient, gute Oxidations- und Spannungskorrosionsbest\u00e4ndigkeit, unempfindlich gegen Chloridionen<\/td>Schlechte Plastizit\u00e4t und Z\u00e4higkeit, vor allem nach dem Tiefziehen und andere gro\u00dfe Verformung der kalten Verarbeitung, Schwei\u00dfen und anderen hohen Temperaturen Plastizit\u00e4t und Korrosionsbest\u00e4ndigkeit deutlich reduziert<\/td><\/tr>
Dupex-Edelstahl<\/td>Ausgezeichnete Korrosionsbest\u00e4ndigkeit, umfassende mechanische Eigenschaften, Schwei\u00dfeigenschaften, hohe W\u00e4rmeleitf\u00e4higkeit.<\/td>Die Verarbeitung ist schwierig und die hohen Kosten<\/td><\/tr>
Titan-Rohre<\/td>Ausgezeichnete Korrosionsbest\u00e4ndigkeit, geringe Dichte, geringes Gewicht, gute umfassende Leistung.<\/td>Teuer <\/td><\/tr><\/tbody><\/table>
Vor- und Nachteile der verschiedenen Materialien f\u00fcr Verfl\u00fcssigerrohre<\/figcaption><\/figure>\n\n\n\n

Different materials of the heat exchange pipe because of its own characteristics and cost factors, its application scope and working conditions are not the same. The corrosion in the Condenser is always an important problem in boiler accidents in power plants. The condensers of power plants in offshore areas generally use Cu-Zn tubes and Cu-Ni alloy tubes. The corrosion resistance of the latter is better than that of the former, because the thermodynamic stability of Ni is close to that of Cu, and the nanoscale compact and stable surface film will be generated on the surface in water or air. Therefore, the Cu-Ni tube in high saltwater (or seawater) and dilute acid, alkali medium is not easy to corrosion. But once there is an attachment on the surface of the copper tube, pitting will occur. Pitting corrosion is autocatalytic and latent, which will bring great damage. The condenser tube blockage and leakage frequently occur in the offshore area due to seawater backfilling, corrosion, dirt and other reasons. Yongxiang operates the generator set. Why is the brass condenser tube so easy to corrode? It depends on the type of corrosion. The corrosion of copper alloy condenser tube is affected by many factors, and the corrosion types are various, mainly including the following items:<\/p>\n\n\n\n

Selektive Korrosion<\/strong><\/p>\n\n\n\n

Da das Kupferrohr des Kondensators gr\u00f6\u00dftenteils aus einer Kupfer-Zink-Legierung besteht, ist das Zinkpotenzial niedriger als das von Kupfer, so dass Zink leicht zur Anode einer korrodierenden Batterie werden kann, so dass Zink selektiv gel\u00f6st wird und das Kupferrohr korrodiert. Theorie und Praxis zeigen, dass der Korrosionsprozess von Kupferrohren eng mit der Leistung des Schutzfilms auf der Oberfl\u00e4che des Kupferrohrs zusammenh\u00e4ngt. Wenn der anf\u00e4ngliche dichte Schutzfilm nicht gebildet wird, ist die Korrosion des Kupferrohrs wahrscheinlicher. Wenn es keine anf\u00e4ngliche Beschichtungsbehandlung von FeSO4 auf dem Kupferrohr des Kondensators gibt, kann es auch leicht zu lokaler Entzinkungskorrosion f\u00fchren.<\/p>\n\n\n\n

Korrosion der Elektroden<\/strong><\/p>\n\n\n\n

Coupling corrosion may occur when two different metal materials come into direct contact in a corrosive medium. In the condenser, the copper alloy condenser tube material is different from the carbon steel tube sheet material in the cooling water potential, there is the possibility of galvanic corrosion between them. The potential of the condenser copper tube is higher than that of the tube plate, which will accelerate the corrosion of the tube plate. But because the thickness of the carbon steel tube plate is larger, generally 25~40mm, the galvanic corrosion won\u2019t affect the safe use in clean freshwater, but in the environment with a high salt concentration of water galvanic corrosion is more likely to occur.<\/p>\n\n\n\n

Lochfra\u00df<\/strong><\/p>\n\n\n\n

Diese Korrosion neigt dazu, auf der Oberfl\u00e4che des Kupferrohrs Schutzfilm Riss auftreten. Da das K\u00fchlwasser Cl und Cu Oxidation durch Cu + zu instabilen CuCl erzeugt enth\u00e4lt, kann in stabile Cu2O hydrolysiert werden, und machen die L\u00f6sung lokale Versauerung thermische Ausr\u00fcstung Korrosion. Wenn das Kupferrohr des Kondensators nicht rechtzeitig gereinigt wird, beg\u00fcnstigen die ungleichm\u00e4\u00dfigen Oberfl\u00e4chenablagerungen die Korrosion und f\u00fchren schlie\u00dflich zu punktueller Korrosionsperforation. In den Betrieb des Kondensators Kupferrohr in h\u00e4ufigen Start-Stopp, Lastwechsel ist gr\u00f6\u00dfer, die Auswirkungen der High-Speed-Turbine Abgasdampf, die Rolle der Kupferrohr durch Wechselspannung, leicht zu machen, die Messingoberfl\u00e4che Membran Bruch, produzieren lokale Korrosion, Lochfra\u00df Korrosion Grube Bildung, reduzieren Materialerm\u00fcdung Grenze, und weil die Stress-Konzentration an der Korrosion, Lochfra\u00df Boden ist leicht zu knacken, Unter der Erosion von NH3, O2 und CO2 in Wasser, die Fraktur wird schrittweise erweitert.<\/p>\n\n\n\n

Erosion corrosion<\/strong><\/p>\n\n\n\n

This type of corrosion can occur on both the waterside and the steam side, mainly in the waterside. Suspended solids, sand and other solid granular hard objects in circulating cooling water impact and friction on the copper tube at the inlet end of the condenser. After a long time of operation, the inner wall of the front section of the copper tube at the inlet end is rough. Although there is no obvious corrosion pit, the surface is rough, the brass matrix is exposed and the copper tube wall becomes thin. The anodic process of erosion and corrosion can be said to be the dissolution of copper, and the cathodic process is the reduction of O2. The high flow rate will hinder the formation of stable protective film, is also the cause of erosion-corrosion, the general flow rate is not more than 2m\/s.<\/p>\n\n\n\n

NH3-Korrosion<\/strong><\/p>\n\n\n\n

\u00dcbersch\u00fcssiges NH3 gelangt mit dem Dampf in den Kondensator und konzentriert sich lokal im Kondensator. Wenn gleichzeitig O2 vorhanden ist, kommt es auf der Dampfseite des Kupferrohrs in diesem Bereich zur NH3-Erosion. Charakteristisch ist eine gleichm\u00e4\u00dfige Ausd\u00fcnnung der Rohrwand, und NH3-Erosion tritt leicht auf, wenn der Ammoniakgehalt im Wasser 300 mg\/L erreicht. Das Kondensat an der Umlenkbohrung ist zu kalt und die Konzentration des gel\u00f6sten Ammoniaks ist erh\u00f6ht, was ebenfalls die ringf\u00f6rmige Ammoniakerosion im Kupferrohr verursacht.<\/p>\n\n\n\n

Spannungsrisskorrosion<\/strong><\/p>\n\n\n\n

When the condenser copper tube is not installed properly, vibration and alternating stress will occur in the operation of the copper tube surface to destroy the protective film and corrosion, finally, produce transverse crack to break the copper tube. This is mainly due to the relative displacement of grains inside the copper tube under the action of alternating stress, and the formation of anodic dissolution in the corrosive medium, mostly occurring in the middle of the copper tube.<\/p>\n\n\n\n

Mikrobielle Korrosion<\/strong><\/p>\n\n\n\n

Microorganisms can change the medium environment in local areas of the condenser wall and cause local corrosion. The electrochemical corrosion process of metal in cooling water is promoted by the biological activity of microorganisms, which generally occurs on the carbon steel tube plate at the inlet side of the condenser. Cooling water often contains bacteria that thrive on Fe2+ and O2, called iron bacteria, which form brown slime. The anoxic conditions at the bottom of the slime provided a suitable environment for the survival of anaerobic sulfate-reducing bacteria. The combined action of iron bacteria and sulfate-reducing bacteria promotes metal corrosion. Operating temperature on the high side, the corrosion scale inhibitor and water quality and operating temperature are not appropriate, inadequate dosage or concentration fluctuations in the scale, will cause the condenser tube wall local Cl – easy through scale layer, caused the corrosion of the metal matrix, and the corrosion of metal ion hydrolysis, leading to higher medium H + concentration of algae and microbial activities also cause increased acidity of medium, The passivation film on the metal surface is destroyed and the metal matrix is further corroded.<\/p>","protected":false},"excerpt":{"rendered":"

The condenser is important auxiliary equipment in the thermal generator set. The condenser is generally composed of neck, casing, water chamber, tube bundle, tube plate, support rod, steam baffle, air cooling area, hot well and other parts, which is the key equipment to determine and affect the load and thermal efficiency of a steam turbine. The heat […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"yoast_head":"\nThe commonly used material for condenser tubes<\/title>\n<meta name=\"description\" content=\"The materials of condenser heat exchange pipe are mainly copper alloy pipe, Austenitic stainless steel pipe, Ferrite stainless steel pipe, Duplex stainless steel pipe, titanium and titanium alloy pipe.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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