Studies on initiation, growth and sintering in the formation of utility boiler deposits

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:7148983

Tangsathitkulchai, M

Three laboratory-scale devices were utilized to investigate the mechanisms of the formation of boiler deposits. Sticking apparatus investigations were conducted to study deposit initiation by comparing the adhesion behavior of the ash drops on four types of steel-based heat exchanger materials under the conditions found in a utility boiler and an entrained slagging gasifier. In addition, the adhesion behavior of the ash drops on a reduced steel surface were investigated. All the ash drops used in this investigation were produced from bituminous coals. A vertical externally-heated tube furnace was used as an accelerated test to study the deposits formed from nine coals, ranging from high-rank bituminous coals to low-rank subbituminous and lignite coals, under conditions simulating a utility boiler. Synthetic coals prepared from known minerals dispersed in a copolymer (polyester-styrene-divinyl benzene) were also tested to obtain a clearer understanding of the behavior of the minerals in coals during the deposit formation process. The development of deposit strength by fly ash sintering was investigated to provide an insight into the process of sintering occurring in the deposit mass. The investigation was accomplished by measuring the physical and chemical changes of the sintered products as a function of temperature. Additional parameters studied were the composition, time, and atmosphere. The combined use of these three techniques to evaluate deposit initiation, growth and sintering established a preliminary hypothesis to explain the mechanisms of utility boiler deposit formation.

• Research Organization: Pennsylvania State Univ., University Park (USA)
• OSTI ID: 7148983
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
ADHESION
AEROSOL WASTES
ASHES
BENCH-SCALE EXPERIMENTS
BITUMINOUS COAL
BLACK COAL
BOILERS
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
COAL
DEPOSITION
DEPOSITS
ENERGY SOURCES
FABRICATION
FLY ASH
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FOULING
FUELS
KINETICS
LIGNITE
MATERIALS
MINERALS
PHYSICAL PROPERTIES
POWER PLANTS
PULVERIZED FUELS
REACTION KINETICS
RESIDUES
SINTERING
SUBBITUMINOUS COAL
SYNTHESIS
SYNTHETIC MATERIALS
TEMPERATURE DEPENDENCE
THERMAL POWER PLANTS
TIME DEPENDENCE
WASTES