Mechanisms of fouling, slagging, and corrosion by pulverized-coal combustion. Quarterly technical progress report No. 7, April 1-July 1, 1983

Technical Report · Fri Jul 01 04:00:00 EDT 1983

OSTI ID:5746740

Hsu, L L

Control techniques to reduce particulate fouling of heat exchanger tubes were employed. The first control experiment used one part SiO/sub 2/ (10 micron diameter average) mixed in with 10 parts Glass 4.4. Preliminary analysis indicates some reduction of fouling deposits especially on the lower temperature tubes. It is believed that the mechanism whereby the rate of fouling may be reduced is due to agglomeration and partial fusing of angular refractory SiO/sub 2/ particles with glass spheres to form irregular composites that are less susceptible to softening/reactions which generally lead to fouling. This phenomenon will be investigated in greater detail. Microstructural analysis of fouling by pure SiO/sub 2/ revealed morphological features in the Croloy and SA 210 tubes that confirmed the previously suggested fact that fouling can be enhanced by corrosion processes. The resulting microstructure showed SiO/sub 2/ firmly embedded in the iron oxide scale. In the case of Fe/sub 2/O/sub 3/ as the fouling medium, target temperature was found to be the single most significant factor in fouling. Examination of glass deposits on Hastelloy X from two experiments in which the target temperature was at 2000/sup 0/F and 1600/sup 0/F showed the formation of a fully slagged glass layer at the higher temperature while the glass deposits on the cooler tube were individual spheres. This is further evidence of the critical significance of temperature.

• Research Organization: Solar Turbines, Inc., San Diego, CA (USA)
• DOE Contract Number: AC22-81PC40272
• OSTI ID: 5746740
• Report Number(s): DOE/PC/40272-T4; ON: DE83018195
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
AGGLOMERATION
ALLOYS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
COAL
COBALT ALLOYS
COMBUSTORS
CORROSION
CROLOY
ENERGY SOURCES
FOSSIL FUELS
FOULING
FUELS
GLASS
HASTELLOY X
HASTELLOYS
HEAT EXCHANGERS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
IRON OXIDES
MATERIALS
MINERALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
PARTICLES
PARTICULATES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SLAGS
STEELS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN ALLOYS