Mechanisms of fouling, slagging and corrosion by pulverized coal combustion. Quarterly technical progress report No. 4, July 1-September 30, 1982. [Mechanisms]

Technical Report · Fri Oct 01 04:00:00 EDT 1982

OSTI ID:5988164

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

Experimental activity in this quarter was concentrated on performing experiments in seven test groups. The test parameters include Al/sub 2/O/sub 3/ or SiO/sub 2/ as the particulate phase, NaCl, 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 for conversion of NaCl to Na/sub 2/SO/sub 4/. Significant factors that have emerged from analyses of the data obtained thus far are: (1) Al/sub 2/O/sub 3/ particles do not contribute to fouling, regardless of the chemical environment; (2) particle and gas stream velocities appear to contribute significantly to fouling behavior as they affect the residence time of reactive species which may be kinetically limiting; (3) SiO/sub 2/ (10 micron average diameter) can lead to extensive fouling in the presence of NaCl/SiO/sub 2/ and Na/sub 2/SO/sub 4//SO/sub 2/. Mechanisms of fouling depend on whether salt species are condensing or non-condensing; (4) fouling pattern observed is characterized by ridge formation at the leading edge and a moderately uniform layer covering the trailing edge surfaces; (5) extensive corrosion was noted in the low alloy tube materials (Croloy and SA210) with one exception; (6) where corrosion was widespread, spallation and/or pitting attack produced rough surfaces which allowed particles to be trapped in the surface crevices. 11 references, 22 figures, 4 tables.

• Research Organization: Solar Turbines, Inc., San Diego, CA (USA)
• DOE Contract Number: AC22-81PC40272
• OSTI ID: 5988164
• Report Number(s): DOE/PC/40272-T5; ON: DE85009050
• Country of Publication: United States
• Language: English

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ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BOILERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COAL
COMBUSTION
CORROSION
CORROSIVE EFFECTS
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DIAGNOSTIC TECHNIQUES
ENERGY SOURCES
FOSSIL FUELS
FOULING
FUELS
GLASS
HALIDES
HALOGEN COMPOUNDS
MATERIALS
MATERIALS TESTING
MEASURING METHODS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PITTING CORROSION
SILICON COMPOUNDS
SILICON OXIDES
SLAGS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR COMPOUNDS
TEST FACILITIES
TESTING
THERMOCHEMICAL PROCESSES
VELOCITY
VISCOSITY