Wet limestone at 30°C containing 93% CaCO3 and H2O enters the kiln. Limestone is calcined in the kiln which supplies heat by superheated steam at 65 psia and 540°F. The percent conversion of CaCO3 in the kiln is 75%. The quicklime is discharged from the kiln at 150°C. After releasing heat in the kiln, the superheated steam becomes saturated water, H2O(l), and leaves at 130°F. Assuming no heat loss from this process, calculate the pounds (lb) of superheated steam required per 71 kg of limestone entering the kiln. (Please draw a flow chart and provide the basis.)
thPree
Sat. (Sat. Temp.) Water
Sat., Steam
200 250
300*
350 400* 450* 500 600' 700" 800* 909 1000' 1100' 1200" 18.99 68.99 118.99 168.99 218.99 318.93 418.99 $18.99 618.99 718.99 818.99 918.99 8,777 9,430 10.06 10.69 11.30 12.53 13.74 14.93 16.14 17.34 18.55 19.75 1184.6 1210.3 1235.2 1258.6 1282.6 1331.0 1379.9 1429.3 1479.3 1330.4 1582.0 1634.6 12.93 62.93 112.93 162.93 212.93 312.93 412.93 $12.93 612.93 712.93 812.93 912.93 7,950 8.553 9.130 9.703 10.26 11.38 12.48 13.57 14.67 15.76 16.86 17.95 1183.2 1209.4 1234.6 1258.2 1282.2 1330.7 11111 1429.1 1479.2 1530.3 1581.9 1634.5 57.29 107.29 157.29 207.29 307.29 407.29 $07.29 607.29 707.29 807.29 907.29 7.821 8.353 9.398 10.42 11.44 12.44 13.44 14.44 15.45 16.45 1181.8 1208.5 1234.0 1257.7 1281.8 1330.4 1428.9 1479.0 1530.2 1581.8 1634.4 2.03 $2.03 10001 152.03 202.03 302.03 402.03 502.03 602.03 702.03 $02.03 20'206 6,674 7.202 7,696 8.187 .665 9.614 10.55 11.48 12.40 13.33 14.26 15.19 1180.4 1207.6 1233.4 1257.2 1281.4 1330.1 1379.3 1428.8 1478.9 1530.1 1581.7 1634.4 47.08 97.08 147.08 197.08 297.08 397.08 497.08 597.08 697.08 797.08 897.08 6.671 7.132 7.592 8.036 8.920 9.791 10.65 11.51 12.37 13.24 14.10 1232.8 1256.7 1281.0 1329.9 1428.6 1478.7 1530.0 1581.6 1634.3
so. 0.0173 (281.01) 250.09 Sh 55 0.0173 (287.07) 256.30 Sh 60 .e 0.0174 (292.71) 262.10
8.522 1174.0
1175.8
7.179 1177.5
65
0.0174 267.51
6.654 1179.1
5h 70 (302.92)
0.0175 272.61
6.210 1180.5