Elementary Principles 429 - 9.61 (cont'd) 30% relative...

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9- 77 b. 30% relative humidity (inlet air): yP p n n HO 22 Table B.3 C mm Hg mm Hg ×+ = B 030 30 595 10 2 24 10 760 0 300 31824 2 67 2 . ± .. bg b g b g ⇒= × ± . n 2 5 361 10 mol H O h 2 Volumetric flow rate of inlet air: ± . V = ×+×+× 595 10 224 10 361 10 643 10 675 5 ej mol 22.4 liters STP 1 m h 1 mol 10 liters SCMH 3 3 Air/fuel ratio: 161 53 . . × = m a i rh 40000 kg coal h SCM air kg coal H balance: 198 10 2 361 10 2 1351 10 65 44 6 ±± . ×= = × mol H h mol H h mol H O h H in coal H in water vapor 2 ²³ ´´ ´µ ´´´ ´´´´ nn H O content of stack gas mol H O h mol h 2 2 2 = × × 1357 10 1357 10 2 812 10 100% 4 6% 6 . . Energy balance on stack gas in preheater References : CO , CO, O , N , H O v at 25 C 2 222 D Substance mol h kJ mol mol h kJ mol CO 2.193 10 2.193 10 CO 0 10 0 10 O3 1 0 3 1 0 N 2 21 0 7 0 1 1 0 1 1 0 in in out out 2 66 2 2 n H n H ¶¶ . . . ×× 4 942 9 738 337 3669 337 6 961 706 3758 206 7193 38 3655 38 6 918 357 4266 351 8135 2 () HT C d T ii p from Table B.8 for inlet = for outlet Table B.2
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