122 



The Philippine Journal of Science 



Since the preceding tests were made, Uling, Yoshinotani, Ho- 

 koku, and Chaoko Chwang coals, a mixture of coconut husks and 

 shells, and copra cake have been successfully used to operate the 

 producer. 



The results obtained from the mixture of coconut husks and 

 shells and from copra cake bear a direct important relation to 

 the improvement that can be introduced in the process of drying 

 copra and in the use of these fuels in the copra-oil mills. The 

 results are given in Table VII. 



Table VII. — Results of tests of mixture of 1 volume of coconut husks to 2 

 volumes of shells and of copra cake alone used as fuel in a producer- 

 gas generator. 



Test 

 No. 



Dura- 

 tion of 

 run. 



Fuel. 



Lower calorific 

 value of fuel. 



Lower 

 calorific 

 value of 

 producer 

 gas per 

 cubic meter 

 under or- 

 dinary 

 pressure 

 and tem- 

 perature. 



Total 

 fuel. 



Total net 

 kilowatt 

 hours 

 gener- 

 ated. 



Fuel per 

 net kilo- 

 watt 

 hour. 



1 

 2 

 3 

 4 

 5 



Hours. 

 6 



7 

 8 

 8 

 10 



Mixture of husk and 

 shell 1:2 by vol- 

 1 ume. 



J HuBk=3,781 



1 Shell=4.060 



3.855 



1 1047. 1 

 1455. 6 



KUos. 

 589.0 

 684.0 

 714.0 

 677. 5 

 996.0 



154.0 

 208.0 

 236.5 

 237.0 

 308.6 



Kilos. 

 3.80 

 3.26 

 3.19 

 2.86 

 3.22 





The mixture of husks and shells gave the best result in test 4, 

 which can be accounted as due to the experience acquired by the 

 operators in firing the fuel before this test was performed. The 

 amount of husks and shells on hand was not sufficient to make 

 a series of tests of varying proportions in order to establish 

 beyond doubt the most economical mixture of husks and shells 

 for this particular producer. However, in the preliminary trials 

 this was done during short intervals, and it has shown that 

 pure husks can be burned in this producer only when the load 

 is very light, because its design is adapted for relatively dense 

 fuels. The shells when used alone behaved much like lignite 

 with regard to their load-carrying capacity. The standard 

 charge adopted in the tests was one volume of husks to two 

 of shells, and this mixture was capable of responding to the 

 maximum load of the engine. The fuel was fired as received — 

 the shells in hemispheres and each husk in from four to six pieces. 

 The depth of the fuel was maintained at the full capacity of 



