A study of techniques for reducing ash deposition in coal-fired gas turbines

Conference · Sun Jan 01 04:00:00 EST 1989 · Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA)

OSTI ID:5113391

Logan, R G; Richards, G A; Meyer, C T; Anderson, R J ^[1]

---

1. Morgantown Energy Technology Center, WV (USA)

Corrosion and deposition on engine components are potential barriers to the utilization of coal and coal-derived fuels in heat engines. The US Department of Energy has established a program to study mechanisms of ash deposition, with the goal of developing methods to alleviate deposition problems in coal-fired gas turbines. Ash deposits are formed in the turbines by the adherence of ash particles to the surfaces of stators and blades. During combustion, components of the coal ash become molten and thus readily adhere to metal surfaces in the turbine upon impaction. Deposit growth can be enhanced by the formation of a liquid layer on the surface of the ash particles, which may consist of alkali sulfates, aluminosilicates, or low-melting compounds of iron or calcium. Typically, some fraction of the total amount of ash (denoted as the sticking coefficient) actually sticks to turbine components forming a deposit. The tendency of various coals to form ash deposits during combustion is a function of several variables including the as chemistry, the gas temperature and pressure, the gas velocity, and the temperature of the turbine components. The objective of this work was to measure the sticking coefficient of various coals while studying the basic mechanisms of ash deposit formation to facilitate the development of techniques for preventing deposition in coal-fired gas turbines. Two methods of mitigating ash deposition were studied; active cooling of the deposition target, and the use of fuel additives.

• OSTI ID: 5113391
• Report Number(s): CONF-8904166--
• Conference Information: Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA) Journal Volume: 34:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
014000* -- Coal
Lignite
& Peat-- Combustion
ADDITIVES
ADHESION
AEROSOL WASTES
ASHES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL-FIRED GAS TURBINES
COMBUSTION
COOLING
DATA
DEPOSITION
DEPOSITS
DESIGN
ENERGY SOURCES
EXPERIMENTAL DATA
FLY ASH
FOSSIL FUELS
FUELS
GAS TURBINES
INFORMATION
MACHINERY
MATERIALS
NUMERICAL DATA
OXIDATION
RESIDUES
THERMOCHEMICAL PROCESSES
TURBINES
TURBOMACHINERY
WASTES