Degradation mechanism of Cr2O3‐Al2O3‐ZrO2 refractories in a coal‐water slurry gasifier: Role of stress cracks. Issue 5 (14th January 2020)

• Record Type: Journal Article
• Authors: Chen, Junfeng; Xiao, Junli; Zhang, Yu; Wei, Yaowu; Li, Youqi; Zhang, Shaowei; Li, Nan
• Is Part Of: Journal of the American Ceramic Society. Volume 103:Issue 5(2020)
• Page Start: 3299
• Page End: 3310
• Publication Date: 2020-01-14
• Subjects: coal‐water slurry gasified -- corrosion mechanism -- refractories failure -- stress cracks; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.17001
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Durability and corrosion behavior of refractory lining, a core part of a commercial water‐coal slurry gasifier, largely determine its gas yield rate and carbon conversion rate. In this work, corrosion behavior of high chromite‐containing refractory served for 4200 hours in a water‐coal slurry gasifier was studied, and the role of generated stress cracks on its degradation behavior was elucidated. The results demonstrated that the depth of penetration under the assistance of the cracks was up to 2.60 cm, which was much deeper than that in the case free from stress crack. The sub‐surface, accompanied by cracking, provided a pathway for slag penetration and resulted in more severe corrosion. Furthermore, the isolation layer of (Cr, Fe, Al)2 O3 solid solution on the refractory' surface trapped most of the iron oxides. As a result, a further attack from other main corrosive species was controlled by their diffusion through it.