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Title: Effects of alternate fuels refractory test facility test 3. Part 2. Analysis of magnesia- and alumina-based dense refractories exposed to the combustion products of No. 6 residual oil

Abstract

Industrial conversion from natural gas to residual oil or coal for process heating generally accelerates deterioration of refractories because of reactions with fuel impurities. This investigation was the third experiment to determine the nature and extent of degradation reactions between fuel impurities (in combustion products) and constituents of the refractories under controlled combustion conditions. The dense refractories included three magnesia-based bricks, a chrome mortar, three alumina-based bricks, and three alumina-based castables. These specimens were exposed to the combustion products of a medium-sulfur No. 6 oil at a hot-face temperature of 1350/sup 0/C for 1002 h with 7 to 10% excess oxgyen. The furnace was cycled 18 times between 500 and 1350/sup 0/C. The specimens were analyzed by ceramography, electron microprobe analysis, and x-ray diffraction. Some specimens contained cracks originating at the hot face. The magnesia-based bricks evidently contained a network of small cracks, since they fragmented easily. Cracking was caused by excessive cooling rates from 1350/sup 0/C when equipment failure caused unscheduled furnace shutdowns. All the specimens were discolored. The depth of the colored zone from the hot face increased with decreasing alumina content in the alumina-based refractories. Fuel impurities were detected on the hot faces and in some specimensmore » in various phases near the hot face; however, new phases involving fuel impurities were definately identified only in two alumina-based bricks. We concluded that no significant degradation of the refractorie due to impurity-related phase formation occurred under the conditions of this test because the oil contained relatively low concentrations of impurities. This fuel, therefore, was not very agressive in degrading the refractory specimens.« less

Authors:
;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
OSTI Identifier:
5381980
Report Number(s):
ORNL/TM-7284
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 36 MATERIALS SCIENCE; ALUMINIUM OXIDES; PERFORMANCE TESTING; THERMAL DEGRADATION; FURNACES; REFRACTORIES; MAGNESIUM OXIDES; RESIDUAL FUELS; COMBUSTION PRODUCTS; CHEMICAL COMPOSITION; COMBUSTION; DECOMPOSITION; EXPERIMENTAL DATA; FUEL SUBSTITUTION; IMPURITIES; INDUSTRIAL PLANTS; MATERIALS TESTING; ALKALINE EARTH METAL COMPOUNDS; ALUMINIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; DATA; FUEL OILS; FUELS; INFORMATION; MAGNESIUM COMPOUNDS; NUMERICAL DATA; OILS; ORGANIC COMPOUNDS; OTHER ORGANIC COMPOUNDS; OXIDATION; OXIDES; OXYGEN COMPOUNDS; PETROLEUM PRODUCTS; TESTING; THERMOCHEMICAL PROCESSES; 320303* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Equipment & Processes; 360200 - Ceramics, Cermets, & Refractories

Citation Formats

Federer, J I, and Tennery, V J. Effects of alternate fuels refractory test facility test 3. Part 2. Analysis of magnesia- and alumina-based dense refractories exposed to the combustion products of No. 6 residual oil. United States: N. p., 1980. Web.
Federer, J I, & Tennery, V J. Effects of alternate fuels refractory test facility test 3. Part 2. Analysis of magnesia- and alumina-based dense refractories exposed to the combustion products of No. 6 residual oil. United States.
Federer, J I, and Tennery, V J. 1980. "Effects of alternate fuels refractory test facility test 3. Part 2. Analysis of magnesia- and alumina-based dense refractories exposed to the combustion products of No. 6 residual oil". United States.
@article{osti_5381980,
title = {Effects of alternate fuels refractory test facility test 3. Part 2. Analysis of magnesia- and alumina-based dense refractories exposed to the combustion products of No. 6 residual oil},
author = {Federer, J I and Tennery, V J},
abstractNote = {Industrial conversion from natural gas to residual oil or coal for process heating generally accelerates deterioration of refractories because of reactions with fuel impurities. This investigation was the third experiment to determine the nature and extent of degradation reactions between fuel impurities (in combustion products) and constituents of the refractories under controlled combustion conditions. The dense refractories included three magnesia-based bricks, a chrome mortar, three alumina-based bricks, and three alumina-based castables. These specimens were exposed to the combustion products of a medium-sulfur No. 6 oil at a hot-face temperature of 1350/sup 0/C for 1002 h with 7 to 10% excess oxgyen. The furnace was cycled 18 times between 500 and 1350/sup 0/C. The specimens were analyzed by ceramography, electron microprobe analysis, and x-ray diffraction. Some specimens contained cracks originating at the hot face. The magnesia-based bricks evidently contained a network of small cracks, since they fragmented easily. Cracking was caused by excessive cooling rates from 1350/sup 0/C when equipment failure caused unscheduled furnace shutdowns. All the specimens were discolored. The depth of the colored zone from the hot face increased with decreasing alumina content in the alumina-based refractories. Fuel impurities were detected on the hot faces and in some specimens in various phases near the hot face; however, new phases involving fuel impurities were definately identified only in two alumina-based bricks. We concluded that no significant degradation of the refractorie due to impurity-related phase formation occurred under the conditions of this test because the oil contained relatively low concentrations of impurities. This fuel, therefore, was not very agressive in degrading the refractory specimens.},
doi = {},
url = {https://www.osti.gov/biblio/5381980}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {7}
}

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