Menu
Search
Filters
Close
Menu

51318-11191-Behavior of High-Temperature Materials in Sulphur-Containing Steam Cracking Conditions

Picture for Behavior of High-Temperature Materials in Sulphur-Containing Steam Cracking Conditions
Available for download

The influence of sulfur as H2S-addition on the stability or degradation of tube materials and on the coke formation was studied. The investigated samples were alumina-forming- as well as chromia-forming alloys taken from conventional radiant tubes.

Product Number: 51318-11191-SG
Author: Dietlinde Jakobi / Peter Karduck
Publication Date: 2018
$0.00
$20.00
$20.00

Radiant coils in steam-cracking furnaces operate under severe reducing and oxidizing conditions at temperatures even beyond 1100 °C. Sulphur is present in feedstocks as natural constituent (naphtha cracking) or as deliberate addition (ethane cracking), and can influence the coke formation and also the stability of tube materials.

The influence of sulfur as H2S-addition on the stability or degradation of tube materials and on the coke formation was studied. The investigated samples were alumina-forming- as well as chromia-forming alloys taken from conventional radiant tubes. In a laboratory-scale reactor comparative cracking-decoking tests were applied to the samples. Testing conditions were relevant to industrial steam cracking. Sulfur was continuously added as H2S to the synthetic feed. Sample temperature could be varied during cracking up to 1100 °C. The influence of continuous H2S addition to the feed on coke formation and on the tube material deterioration was studied. The investigations reflect the impact of sulfur on the rate of coke formation and on the coke morphology. Particular focus is on how sulfur influences the physical and chemical nature of catalytically active sites. Sulphur stimulates a process of carbon-induced corrosion, which particularly can deteriorate chromia-forming alloys, whereas alumina scales are resistant.

Key words: Steam-cracking, sulfur, catalytic coking, high-temperature corrosion, coil material, alumina scale, chromia scale, high-temperature material

Radiant coils in steam-cracking furnaces operate under severe reducing and oxidizing conditions at temperatures even beyond 1100 °C. Sulphur is present in feedstocks as natural constituent (naphtha cracking) or as deliberate addition (ethane cracking), and can influence the coke formation and also the stability of tube materials.

The influence of sulfur as H2S-addition on the stability or degradation of tube materials and on the coke formation was studied. The investigated samples were alumina-forming- as well as chromia-forming alloys taken from conventional radiant tubes. In a laboratory-scale reactor comparative cracking-decoking tests were applied to the samples. Testing conditions were relevant to industrial steam cracking. Sulfur was continuously added as H2S to the synthetic feed. Sample temperature could be varied during cracking up to 1100 °C. The influence of continuous H2S addition to the feed on coke formation and on the tube material deterioration was studied. The investigations reflect the impact of sulfur on the rate of coke formation and on the coke morphology. Particular focus is on how sulfur influences the physical and chemical nature of catalytically active sites. Sulphur stimulates a process of carbon-induced corrosion, which particularly can deteriorate chromia-forming alloys, whereas alumina scales are resistant.

Key words: Steam-cracking, sulfur, catalytic coking, high-temperature corrosion, coil material, alumina scale, chromia scale, high-temperature material

Product tags
Also Purchased
Picture for Effects of Pre-Oxidiation and Carburization on Corrosion in Molten Fluoride Salts
Available for download

51318-11182-Effects of Pre-Oxidiation and Carburization on Corrosion in Molten Fluoride Salts

Product Number: 51318-11182-SG
Author: Kevin J. Chan / Rebecca Ambrecht / Won Tae Choi / Preet M. Singh
Publication Date: 2018
$20.00

Static exposure tests of pre-oxidized stainless steel and carburized chromium were conducted in the molten fluoride salt, LiF-NaF-KF (46.5-11.5-42 mol %), FLiNaK to simulate the corrosion environment typical of some advanced nuclear reaction concepts.
Picture for Corrosion Protection of Out-of-Service Pipelines
Available for download

51318-11189-Corrosion Protection of Out-of-Service Pipelines

Product Number: 51318-11189-SG
Author: Leigh Gendron / Kelly Baker / Terry Natale
Publication Date: 2018
$20.00

This paper presents new applications of Volatile Corrosion Inhibitors (VCI) inside new and/or existing out-of-service pipelines. The system utilizes a combination of soluble and volatile corrosion inhibitors that are directly applied into the pipeline.
Picture for Advances in on-site corrosion inhibitor management
Available for download

51318-11184-Advances in on-site corrosion inhibitor management

Product Number: 51318-11184-SG
Author: Fiona Mackay / Andrew Osnowski / Emma Perfect / Scott Rankin
Publication Date: 2018
$20.00

On-site personnel can now be trained to gather and test samples. Development of this on-site testing kit is described and a case study presented on its use in the field. Feedback provided from on-site personnel, and further development of the method are discussed.

 
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support