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- W135300864 abstract "Fouling of gas turbine passages is of concern when ash bearing fuels are used. This report evaluates the various aspects of the anticipated fouling problem when clean coal in dry or slurry form is used as a turbine fuel and solid/semi-molten particles of flyash, residual char and reacted/unreacted sulfur sorbents are entrained in the combustion gas. For the purpose of analysis, fouling is posed as a two-step process with particle delivery to the blade surface constituting the first step and adhesion of the contacting particles constituting the second. Models of Brownian diffusion, thermophoresis, eddy impaction, and inertial impaction are formulated for determining the rates and mechanisms of particle delivery to the pressure and suction surfaces of turbine blades. Adhesion characteristics of flyash under gas turbine conditions are inferred from experimental data. Based on these models and other experimental data, a number of variables are identified that affect either the delivery rate of the particles or the adhesion characteristics. These are conveniently classified in three categories: physical and chemical aspects of coal feedstock (coal grind and pre-cleaning, slurry composition and additives, mineral matter composition and distribution), combustion environment (slurry atomization, stoichiometry, residence time, fluid mechanics, dilution air), and gas turbine environmentmore » (turbine inlet temperature, blade cooling, passage aerodynamics). A qualitative/semi-quantitative discussion is offered on the roles of flyash size distribution, coal-water mixture slurry atomization, coal combustion, physical and chemical beneficiation of coal, blade cooling, turbine inlet temperature, sorbent injection, and deposition cleanability. 34 refs., 25 figs., 10 tabs.« less" @default.
- W135300864 created "2016-06-24" @default.
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- W135300864 date "1989-04-01" @default.
- W135300864 modified "2023-09-23" @default.
- W135300864 title "Fouling of gas turbine passages" @default.
- W135300864 hasPublicationYear "1989" @default.
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