Title page for ETD etd-11142012-040215

Type of Document Master's Thesis
Author Gentile, Maria
URN etd-11142012-040215
Title Alkali attack of coal gasifier refractrry [sic] lining
Degree Master of Science
Department Materials Engineering
Advisory Committee
Advisor Name Title
Brown, Jesse J. Jr. Committee Chair
Farkas, Diana Committee Member
Yoon, Roe-Hoan Committee Member
  • Refractory materials
Date of Defense 1987-05-15
Availability restricted

An experimental test system was designed to simulate the operating conditions found in nonslagging coal gasifiers. The reaction products that form when refractory linings in coal gasifiers are exposed to alkali impurities (sodium or potassium) were experimentally determined. Analysis of selected physical and chemical properties of the reaction products, which typically form between the alkali and the refractory will lead to a better understanding of the mechanisms behind refractory failures associated with alkali attack.

The reaction products sodium aluminate (Na2O•Al203), N2C3A5 (2Na20·3CaO·5Al203), nepheline (Na20•Al203•2SiO2), potassium aluminate, (K2O•Al203), and kaliophilite (K2O•Al203•2Si02) were synthesized and their solubility in water and coefficients of linear thermal expansion were: measured. Of the compounds tested, the formation of potassium aluminate would be the most detrimental to the gasifier lining. The linear thermal expansion of potassium aluminate was 2.05% from room temperature to 800°C, which was twice as large as the other compounds. Potassium aluminate also possessed the highest solubility in water which was 8.893/L at 90°C.

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