BAGASSE AS FUEL 



465 



the intention of drying the bagasse before combustion obtains in the furnace 

 proper. 



Fig. 278 shows a furnace as applied to a Stirling boiler, and differs from 

 the other designs by the adoption of a horizontal arch, a, in place of a sloping 

 one, and by a check wall, b, of larger dimensions. 



FIG. 278 



The principle of causing very complete mixture of the products of com- 

 bustion by means of a reversed check wall, a, combined with a long extended 

 combustion chamber, is shown in Fig. 279, as applied to a Babcock & Wilcox 

 boiler. 



All the above examples have been shown with inclined grates. Fig. 

 280 shows a flat grate provided with hollow blast furnace bars, a. The air 

 necessary for combustion enters by the conduit b. 



FIG. 279 



The grate disappears entire' y in the Cook furnace (U.S. patents 203643, 

 1886 ; 362362, 372969, 1887 ; 382992, 1888 ; U.K. patent 12393 of 1889). 

 In this design the bagasse is burnt on a hearth, the air necessary to combustion 

 being supplied through the twyers a. As shown in Fig. 281, the typ'cal 

 Cuban setting of one hearth to two boilers is indicated with passage of the 

 gases underneath, back through the tubes and out over the top of the 

 boiler to the main flue. 



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