Mechanisms of fouling, slagging and corrosion by pulverized coal combustion. Quarterly technical progress report No. 5, October 1, 1982-January 1, 1983

Technical Report · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5964484

Hsu, L L; Stetson, A R; Metcalfe, A G

Experimental activity in this quarter was concentrated on performing experiments in four test groups. The test parameters include SiO/sub 2/ or Fe/sub 3/O/sub 4/ as the particulate phase and Na/sub 2/SO/sub 4/ or K/sub 2/SO/sub 4/ as the gas phase constituent with H/sub 2/S added in some tests in order to introduce SO/sub x(g)/ to the gas phase. Significant factors that have emerged from the analysis are: (1) Increasing the particle size to 80 microns greatly reduces the degree of fouling but added to erosion of the tube surfaces. The reduced fouling is probably due to the lack of bond strength to adhere the particles. (2) Varying the melting point of the alkali metal salt has little effect on the SiO/sub 2/ deposit morphology. (3) Significantly increasing the exposure time (i.e., 2.5 times) did not significantly alter the SiO/sub 2/ deposit morphology. (4) Introduction of Fe/sub 3/O/sub 4/ (magnetite) as the particulate phase in the presence of both Na/sub 2/SO/sub 4/ and SO/sub x(g)/ resulted in a thick crusty dark red fouling product. Apparently the magnetite reacted in the oxidizing environment to form hematite (Fe/sub 2/O/sub 3/). It is not certain if the bonding mechanism depends on the magnetite to hematite reaction of a reaction with the alkali metal salt gas phase. 6 references, 9 figures, 6 tables.

• Research Organization: Solar Turbines, Inc., San Diego, CA (USA)
• DOE Contract Number: AC22-81PC40272
• OSTI ID: 5964484
• Report Number(s): DOE/PC/40272-T6; ON: DE85009049
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
20 FOSSIL-FUELED POWER PLANTS
200101 -- Fossil-Fueled Power Plants-- Cooling & Heat Transfer Equipment & Systems
ALKALI METAL COMPOUNDS
BOILERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
CORROSION
CORROSIVE EFFECTS
DESIGN
DIAGNOSTIC TECHNIQUES
ENERGY SOURCES
EROSION
FOSSIL FUELS
FOULING
FUELS
HEMATITE
IRON COMPOUNDS
IRON ORES
IRON OXIDES
MAGNETITE
MATERIALS
MELTING POINTS
MINERALS
ORES
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM SULFATES
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SLAGS
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR COMPOUNDS
TEST FACILITIES
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE