Abstract
Abstract Five 1,000-h combustion tests firing 5 different coals were conducted in a 0.1-MWth fluidized bed combustion (FBC) facility at Western Kentucky University (WKU) with the operating conditions simulating those of the FBC unit at the Tennessee Valley Authority's (TVA) Shawnee Power Station. Five coals were selected with various S and Cl contents ranging from high S (4.48%) and high Cl (0.47%) to low S (0.97%) and low Cl (0.012%). Three types of uncooled steel coupons (Types 304 [UNS S30400], 309 [UNS S30900], and 347 [UNS S34700] stainless steel [SS]) were prepared and installed, based on the advice of TVA, to simulate the evaporator tubes in the superheater region (550°C to 600°C [1,020°F to 1,100°F]). Metal wastage of each coupon was determined by measuring the thickness before and after each combustion test. In order to study the relationship between metal corrosion and ash deposits, a total of 170 ash deposits were collected from the test coupon surfaces during the 5,000-h testing and analyzed. ...
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