Alkali attack of coal gasifier refractory linings
| dc.contributor.author | Sun, Tawei | en |
| dc.contributor.department | Materials Engineering | en |
| dc.date.accessioned | 2019-10-10T19:11:52Z | en |
| dc.date.available | 2019-10-10T19:11:52Z | en |
| dc.date.issued | 1986 | en |
| dc.description.abstract | Thermodynamic calculations are used to study the alkali reactions in coal gasifier atmospheres. The reactive alkali and sulfur species released from coal are first calculated at temperatures from 800 K to 1900 K and pressures from 1 atm to 100 atm. Four P-T diagrams are constructed for the stable alkali and/or alkali-sulfur species at differ-ent temperatures and pressures. Alkali vapors are generated by the reactions Na₂CO₃<sub>(s)</sub> + 2C<sub>(s)</sub> = 2Na<sub>(g)</sub> + 3CO<sub>(g)</sub> Na₂CO₃<sub>(s)</sub> + H₂O<sub>(g)</sub> + C<sub>(s)</sub> = 2NaOH<sub>(g)</sub> + 2CO<sub>(g)</sub> or K₂CO₃<sub>(s)</sub> + 2C<sub>(s)</sub> = 2K<sub>(g)</sub> + 3CO<sub>(g)</sub> K₂CO₃<sub>(s)</sub> + H₂O<sub>(g)</sub> + C<sub>(s)</sub> = 2KOH<sub>(g)</sub> + 2CO<sub>(g)</sub> The phases formed from alkali-cement, and alkali-sulfur-cement reaction are also predicted. For both 53% and 72% alumina cement, calcium aluminate (CaO•Al₂O₃) is decomposed by the reactions CaO•Al₂O₃ + 2Na + 1/20₂ = Na₂O•Al₂O₃ + CaO CaO•Al₂O₃ + 2K + 1/20₂ = K₂O•Al₂O₃ + CaO or CaO•Al₂O₃ + 2Na + l/2S₂ = Na₂0•Al₂O₃ + CaS CaO•Al₂O₃ + 2K + 1/2S₂ = K₂•Al₂O₃ + CaS | en |
| dc.description.degree | M.S. | en |
| dc.format.extent | vi, 64 leaves | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.uri | http://hdl.handle.net/10919/94471 | en |
| dc.language.iso | en_US | en |
| dc.publisher | Virginia Polytechnic Institute and State University | en |
| dc.relation.isformatof | OCLC# 15050727 | en |
| dc.rights | In Copyright | en |
| dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
| dc.subject.lcc | LD5655.V855 1986.S96 | en |
| dc.subject.lcsh | Coal gasification | en |
| dc.title | Alkali attack of coal gasifier refractory linings | en |
| dc.type | Thesis | en |
| dc.type.dcmitype | Text | en |
| thesis.degree.discipline | Materials Engineering | en |
| thesis.degree.grantor | Virginia Polytechnic Institute and State University | en |
| thesis.degree.level | masters | en |
| thesis.degree.name | M.S. | en |
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