STATE GEOLOGIST. 305 
Data Obtained in Test of Two Rotary Cement Kilns, 
with Waste Heat Boilers. 
Coaliconswmedsoerns noun Smet cane soars sire eae ol eke ee 1,888 
Speciicsheatwotmclimlcers. wees sbyers cis eile Wy elaine a fie oe a) rs OFZ 
Clinker produced perzhour, (CaO= 62%) Seer mean ey: 8,018 
Weight calcium carbonate per hour, lbs.................. 8,875 
MOUAUIRG 1, KEW WHELs Goasooobes coed em oo bUGon Odo Oor 3.1 
Weight of carbon dioxide evolved per hour, lbs........... 3,660 
Weight of air supplied per pound of coal, at 44% excess, lbs. 16.1 
Total weight of air supplied per hour, lbs................ 32,397 
Weight of air supplied by coal feeders per hour, lbs....... 5,850 
Total weight of gases discharged per hour, lbs............ : 37,749 
Heat discharged per pound of gas 0.23(1800-100)B.T.U.. . 391 
ANREB), OH QUUSICS OH! [Rib COWARD WSU cdonoeobeb once vnosoes 1,213 
Aneavofnoodsexposedssquareteetinn..s50. 444 s62a 24. 0. 4: 76 
Air entering kilns, average srerenrrexnep OOS, deg. F pe eas ge 480 
Air leaving kilns, average temperature, deg. F............ 1,820 
Air leaving boiler, average temperature, deg. F........... 660 
Air leaving economizer, average temperature, deg. F...... 450 
Mlempcravurcsoimkilnyslowergulmcnscdegn eh yin cc y sec 2,350 to 2,960° 
Memperacurctot salma uppersjpant, ders Heng eras no. 2,960 to 1,800° 
Heat Distribution. 13, We, We Per cent. 
a | a 
Total heat supplied, including heat of formation of silicates...) 31,371,0 0 | 100. 
Discharcedmnommlslnetonoollerncrmeny sem cee). ei il 14,859,859 47.8 
Discharged with clinker (8,018 x 0.2 x 500).................. 4,409,540} 14.2 
Calcium carbonate decomposed (18,875 lbs., 765 per lb.) ..... 6,789,375 OND) 7 
NAG os. Sullolanuar iaavonaels IoermeMeel, scoanesb suo oscoacodcanaod 238,140 ORG 
DED NOS, WRU CYBIOORMIEC o so oovuleng od 8 edibp Uo oubide a nico uot 303,200 0.9 
IRACiAuTOM GING! WHCCOWTUEE! WOR. cosas oeoedovadeucooesuuacnE 4,770,886 14.2 
Radiation per sq. ft. of surface of kiln per hour............... 1,700 
Heat absorbed by boiler from kiln gases.................... 8,798,328 28.8 
Heatrabsonbed bys CCONOMIZeH Yara aaa acre oe een ya: 1,178,998 3.8 
Stackwlossrandapoilenmadiatiom ant sais 6 ene Aaa c estos bale 4,882,533 15.6 
To show the progress of the cement burning in the rotary. kiln 
W. B. Newberry* examined the contents of a cooled, but not emptied, ro- 
tary kiln by taking samples at regular intervals of 48 inches throughout the 
kiln, starting with unburnt stone and finishing with the vitrified, perfect 
clinker within 48 inches of the lower end, 14 samples being taken. The 
kiln was fed with a cement rock limestone mixture and was 60 feet long, 
*“Oement and Hngineering News,” 1902. 
20—S. G., Bull. 3. 
