A practical on-line solution to control ash deposition and improve boiler efficiency
- Land Combustion, Bristol, PA (United States)
An important stage in the operation of plant and process boilers is the conversion of water into steam by the transfer of heat from burning fuel to the water which passes through the tubes that form the surface of the combustion chamber. Heat transfer from the flames to these surfaces is almost entirely by radiation, and thence by conduction through the tube walls to the water. During the operation of coal and oil fired boilers significant amounts of ash/slag form on the water walls of the combustion chamber. These deposits substantially reduce the heat transfer potential of the water walls by modifying the absorptive properties of the surfaces and by establishing a layer of low thermal conductivity material over the heat transfer sections of the boiler. The formation and properties of these deposits are a function of both boiler conditions and the mineral content of fuel. Such factors as high local fuel/air ration, flame impingement on the furnace walls and variable ash mineralisation can result in uncontrollable fouling conditions within the boiler.
- Research Organization:
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States); Encor-America, Inc., Mountain View, CA (United States)
- OSTI ID:
- 121544
- Report Number(s):
- EPRI-TR-104241-V2; CONF-940540-VOL.2; TRN: 95:007222-0007
- Resource Relation:
- Conference: 1994 Electric Power Research Institute (EPRI) heat-rate improvement conference, Baltimore, MD (United States), 3-5 May 1994; Other Information: PBD: Jun 1995; Related Information: Is Part Of 1994 EPRI heat-rate improvement conference. Final report, Volume 2; PB: 250 p.
- Country of Publication:
- United States
- Language:
- English
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