{"id":9469,"date":"2018-05-09T07:21:27","date_gmt":"2018-05-09T12:21:27","guid":{"rendered":"http:\/\/blog.wika.com\/us\/\/?p=9469"},"modified":"2023-09-22T11:34:21","modified_gmt":"2023-09-22T16:34:21","slug":"furnace-tube-maximize-tube-life","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/us\/products\/temperature-products\/furnace-tube-maximize-tube-life\/","title":{"rendered":"How to Maximize Furnace Tube Life and Determine How Much Life Is Left"},"content":{"rendered":"

Reforming reactions in syngas (synthesis gas) plants require high heat, which takes a toll on the lifespan of furnace tubes. The higher the temperature, the shorter the tube life. Using a simple formula based on temperature measurements over time, plant operators can calculate the expired life fraction of the tube and then determine when to replace it.<\/strong><\/p>\n

Syngas plants rely on reforming reactions to obtain ammonia, hydrogen, and methanol. These chemical reactions require huge amounts of high heat. But the thin-film boundaries \u2013 around the tube, catalyst pellets, and tube walls of the furnace \u2013 hinder heat transfer. The key to plant efficiency is an optimized transfer of heat from the burners to the reaction site.<\/p>\n

Engineers have been able to reduce the thickness of tube walls, which improves heat transfer. One way to create thinner walls is to move away from the austenitic Fe-Cr-Ni HK40 alloy to another material, such as the full austenitic Fe-Cr-Ni HP Modified alloy or the advanced Micro steel alloy. These newer metallurgies achieve better heat transfer coefficients than HK40. Syngas furnaces made of these alloys are more efficient while still allowing operations at high temperatures.<\/p>\n

Furnace Tube Life\u00a0<\/h2>\n

Most syngas plants\u2019 furnace tubes are designed to last for 10 years (100,000 hours) working at the maximum design temperature. To create Larson-Miller curves for a particular material, tube manufacturers conduct short accelerated tests at the factory and then extrapolate the results for a longer time scale. These curves display the material\u2019s life over time and temperature using a correlative approach, and can be used to evaluate how different operating temperatures will affect tube life. The table below shows how small temperature increases \u2013 by as little as 36\u00b0F (20\u00b0C) \u2013 can dramatically decrease the life of a typical 4-inch HK40 tube.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Degrees F\u00b0<\/strong><\/td>\nDegrees C\u00b0<\/strong><\/td>\nMean Tube Life<\/strong><\/td>\n<\/tr>\n
1580<\/td>\n860<\/td>\n10 years<\/td>\n<\/tr>\n
1616<\/td>\n880<\/td>\n5 years<\/td>\n<\/tr>\n
1652<\/td>\n900<\/td>\n2.5 years<\/td>\n<\/tr>\n
1697<\/td>\n925<\/td>\n11 months<\/td>\n<\/tr>\n
1742<\/td>\n950<\/td>\n4.5 months<\/td>\n<\/tr>\n
1787<\/td>\n975<\/td>\n2 months<\/td>\n<\/tr>\n
1832<\/td>\n1000<\/td>\n4 weeks<\/td>\n<\/tr>\n
1922<\/td>\n1050<\/td>\n5.5 days<\/td>\n<\/tr>\n
2012<\/td>\n1100<\/td>\n1 day<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Determining How Much Tube Life Is Left<\/h2>\n

Equipment and turnaround downtimes are expensive<\/a>. That is why plant operators need to know how much life is left in a furnace tube so that they don\u2019t schedule shutdowns and replace parts sooner than necessary. Furnaces are sometimes run at temperatures lower than what they are designed for, and thus the tubes could exceed their lifespan. The expired life fraction of the tube can be calculated using this formula:<\/p>\n

n1<\/sub>\/N1<\/sub>+ n2<\/sub>\/N2<\/sub>+ n3<\/sub>\/N3<\/sub>+ \u2026.<\/p>\n

where:<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ni <\/sub>is the actual time at temperature i<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Ni\u00a0<\/sub>is the mean life at temperature i<\/p>\n

The values for ni\u00a0<\/sub>are taken from the actual thermal history of the furnace, and those for Ni\u00a0<\/sub>are from the Larson-Miller curve for the alloy.<\/p>\n

A furnace\u2019s thermal history could come from regular temperature measurements using a pyrometer, a remote-sensing infrared thermometer designed especially for high-heat or inaccessible locations. A more effective method, however, is to pair that method with a tubeskin thermocouple assembly such as the Gayesco\u00a0Xtracto-Pad\u00ae<\/span><\/sup><\/a>. This innovative temperature measurement solution, whose range extends up to 2,300\u00b0F (1,260\u00b0C), has a moldable heat shield and a contoured thermocouple sensor to fit any furnace tube. It can compile a complete online temperature history of the tube, which helps plant operators accurately <\/span>estimate how much tube life is left. This thermocouple assembly can also help determine the impact of a thermal excursion, such as flame impingement, by giving both the time and the duration of the event. Operators can then calculate the expired life fraction caused by the temperature excursion and determine its cost.<\/p>\n

Monitoring tubeskin temperature is extremely important not only for ensuring safer startups and operations, but also for maximizing a furnace tube\u2019s life and knowing when to replace it. Contact WIKA\u2019s experts<\/span><\/a>for more information about temperature measurement solutions for syngas plants, refineries, and other superheated applications.<\/span><\/p>\n

Contact Us<\/span><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"

Reforming reactions in syngas (synthesis gas) plants require high heat, which takes a toll on the lifespan of furnace tubes. The higher the temperature, the shorter the tube life. Using a simple formula based on temperature measurements over time, plant operators can calculate the expired life fraction of the tube and then determine when to […]<\/p>\n","protected":false},"author":190,"featured_media":9482,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5,221],"tags":[720,758,437,759,728],"class_list":["post-9469","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowhow","category-temperature-products","tag-syngas-plant","tag-synthesis-gas-plant","tag-temperature-measurement","tag-thermocouple-assembly","tag-tubeskin"],"acf":[],"yoast_head":"\nMaximize furnace tube life in syngas plants - WIKA blog<\/title>\n<meta name=\"description\" content=\"Refineries need accurate temperature measurements and a complete temperature history of each tube to reliably estimate how much tube life is left.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/us\/products\/temperature-products\/furnace-tube-maximize-tube-life\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Maximize furnace tube life in syngas plants - 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