OCR Text |
Show COER System Design Specifications Tabl~ I. A.b Cornpo.itioD Item Te.I Section Arlc:"Tight Pilubureh '""l"V.t. A"OLUTl. '"" "'" 'LOW RATL "ttl I~?OO YUSU UNCiTH. ... 10 YUSEl OVTSIO( .. OIA"[T( . . ... WAll TMlC.N[U. ... If. lac" ~'lUI ""OCUS ""[A" (lIT ' .no n"'[ .. T""l. "t( YUSEl S.,N < '22 n .. '[IU T""l. "t( IlE .. [HTAl n .... l.ATURE '.US c ..... Iot\.,..,~"t( HEA TtHC U["[NTS ItANTMAL SVPER ~, II,. H[AT[. OVT~ . wtlll ,"OWl. IV"'l Y. Y/A EIHAVST 'lOW COM'OSITION ?,0I0 ",no OllVTl COAL ,"Oel 'tLTEJlEO EIHAUST now < 2 •• < nS"I( ,.usV.[/T( .... [RATVRE FIGURE 2. ---- U" KeYlON rank .,. ASTM ash ash comp, Wl ,. SiD, AI:O, Fe,O, TiDl P20~ C"O MeO K,O Na20 SO, bitumihou, 6.93 48.09 25.07 10.95 1.27 0.18 5.78 1.25 1.16 0.90 5.34 this study was Arkwright Pittsburgh Bituminous having properties as listed in Table 1. The coal (ground to -400 mesh) falls through the drop tube with a residence time greater than 400 ms. The products of combustion flow through a reducing nozzle ending in a 3.2 mm exit diameter. The exiting gas/ash jet is characterized by a speed of 250 m/s and impacts a perpendicular deposition target 6 mm below the nozzle exit (Figure 3). The stagnation flow configuration was designed so that all particles larger than 0.5 microns would be driven into the target surface by inertia, as would occur in a gas turbine. The target is a removable 12.7 mm platinum disk, 0.254 mm thick. Platinum was chosen as a target material because the inert reactivity was thought to make the results independent of specific surface reactions which would be peculiar to any particular blade material. COER Nozzle/Target AssefTlbly '\ \ 1~.~'.::· \ \ \ _- STREAMLINE \ \ ~ TA"-J£CT()Av (y '( ~'OP'.'oC\' FIGURE 3. \ , "- , |