130 



The Philippine Journal of Science 



1916 



fire brick and cement. The smokestack shown in the illustration 

 had been replaced by one 8 meters high by 40 centimeters in 

 diameter before the tests described in this paper were under- 

 taken. Considerable lime of excellent quality was burned in 

 1913 and 1914. This lime was used in the experiments of the 

 Bureau of Science in the preservation of nipa sap for commercial 

 production of sugar/ and a considerable quantity was sold to 

 private individuals and to the Bureau of Supply. 



The operation of the kiln, during the first two years, was pri- 

 marily to obtain sufficient lime for experiments along lines 

 entirely separate from the lime industry itself. Consequently 

 no accurate data concerning the process were kept. In January, 

 1915, I was directed to run a series of tests on the kiln to deter- 

 mine the capacity, the fuel consumption per unit weight of lime, 

 and other factors. Although the quality of the output of the 

 kiln was well known, no study had been made of the cost of 

 operation, and it was desired to know whether or not the kiln 

 represented as great an advance in economy as it did in excellence 

 of product. 



A common practice in this kiln was to use pieces of limestone 

 ranging from 5 to 10 centimeters in diameter. Under these con- 

 ditions the stack did not always insure sufficient draft. A No. 2 

 Sirocco suction fan, driven at the rate of 500 revolutions per 

 minute, was installed and proved very satisfactory. In one 

 day the kiln was heated to the proper temperature, and on Jan- 

 uary 15, 1915, an experimental run was commenced. The kiln 

 was fired at regular intervals — about four shovelfuls of Fushun 

 coal per hour were thrown in at each door. The draft was 

 controlled by a valve in the suction pipe at the top of the kiln. 

 The results of the three-day run are recorded in Table I. 



Table I. — Results obtained from first run of kiln. 



Date. 



Run. 



Coal 

 burned. 



Lime pro- 

 duced. 



Coal on 

 lime. 



Lime per 



kilo of 



coal. 



Limeper 

 hour. 



1915. 

 Jan. 15 to 16 



Hours. 

 12 

 24 

 15 



Kilos. 

 190 

 393 

 331 



Kilos. 

 293 

 922 

 645 



Per cent. 

 64.8 

 42.7 

 51.8 



Kilos. 

 1.54 

 2.34 

 1.96 



Kilos. 

 26.8 

 38.4 

 43.0 



Jan. 16 to 17 



Jan. 17 to 18 



Total 



51 



915 



1,860 











49.1 



2.04 



31.0 









• The temperature of the flue gases was very high, probably from 409° to 500°. 



' See This Journal, Sec. A (1913), 8, 377. 



