Mechanisms of fouling, slagging and corrosion by pulverized coal combustion
The objective of this program is to conduct a detailed and comprehensive study of the mechanisms of fouling, slagging and corrosion in pulverized coal combustors by employing well controlled model systems which simulate the coal combustion environment. A combustion test rig was designed, constructed and calibrated for parametric tests in which the following variables were evaluated: Non-condensing alkali (NaCl), condensing alkali (Na/sub 2/SO/sub 4/, K/sub 2/SO/sub 4/), alkali ratio (Na/K) - melting point depression, inert particles (Al/sub 2/O/sub 3/), reactive particles (SiO/sub 2/ and Fe/sub 2/O/sub 3/), ash viscosity (SiO/sub 2/, Al/sub 2/O/sub 3/, CaO, Fe/sub 2/O/sub 3/ glasses), sulfur (SOx gas, SO/sub 4//sup 2 -/), incomplete combustion - reducing agent (carbon), reactive surface area (SiO/sub 2/ particle size > standard SiO/sub 2/ particle size), gas stream and particle velocity, and tube material and tube temperature. Four target tube materials were employed: SiC (2000/sup 0/F), Hastelloy X (1600/sup 0/F), Croloy (1100/sup 0/F) and SA-210 (800/sup 0/F). Particulate fouling species used in the rig tests ranged from SiO/sub 2/ and Al/sub 2/O/sub 3/ to complex glasses simulating coal ash. In reviewing the wealth of information generated in the test program, a number of significant findings emerge as being most urgent to fouling/slagging: Target tube temperature, viscosity profile, fouling medium particle size and shape, reactivity of fouling medium, aerodynamic flow, dewpoint/condensation of sulfates, particle loading rate, and surface finish. Four approaches are recommended as being potentially capable of reducing fouling and slagging: Chemical control, mechanical erosion (deposit removal), aerodynamic optimization, and elimination of tube corrosion by ceramic coatings. 46 refs., 105 figs., 23 tabs.
- Research Organization:
- Solar Turbines, Inc., San Diego, CA (USA)
- DOE Contract Number:
- AC22-81PC40272
- OSTI ID:
- 5875208
- Report Number(s):
- DOE/PC/40272-8; ON: DE85008002
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanisms of fouling, slagging and corrosion by pulverized coal combustion. Quarterly technical progress report No. 4, July 1-September 30, 1982. [Mechanisms]
Mechanisms of fouling, slagging and corrosion by pulverized coal combustion. Quarterly technical progress report No. 3, April 1-June 30, 1982
Related Subjects
BOILERS
FOULING
PARAMETRIC ANALYSIS
TEST FACILITIES
AERODYNAMICS
ALKALI METAL COMPOUNDS
CHEMICAL REACTIONS
COAL
COMBUSTION
CORROSION
CROLOY
DEW POINT
ELECTRON MICROPROBE ANALYSIS
EXPERIMENTAL DATA
HASTELLOY X
IRON OXIDES
OXIDES
PARTICLE SIZE
PHASE DIAGRAMS
RECOMMENDATIONS
SCANNING ELECTRON MICROSCOPY
SILICON CARBIDES
SILICON OXIDES
SLAGS
SULFATES
SULFUR OXIDES
TEMPERATURE DEPENDENCE
VAPOR CONDENSATION
VAPORS
VELOCITY
VISCOSITY
ALLOYS
CARBIDES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHROMIUM ALLOYS
CHROMIUM STEELS
COBALT ALLOYS
DATA
DIAGRAMS
ELECTRON MICROSCOPY
ENERGY SOURCES
FLUID MECHANICS
FLUIDS
FOSSIL FUELS
FUELS
GASES
HASTELLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
MATERIALS
MECHANICS
MICROANALYSIS
MICROSCOPY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NUMERICAL DATA
OXIDATION
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SIZE
STEELS
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN ALLOYS
200101* - Fossil-Fueled Power Plants- Cooling & Heat Transfer Equipment & Systems