176 FEEDING WITH SUGAR BEETS, SUGAR, ETC. 



Such being the case it becomes imperative to re-heat this 

 residuum in the diffusor, which operation becomes possible by 

 using hot water, and to carry the product as simply and as 

 quickly as possible to the cossette presses. 



The Pfeiffer compressed-air mode for employing the diffusors 

 is certainly very practical in its working. Besides the direct 

 advantages of hot cossette pressing, there is a direct fuel econ- 

 omy, as the residuum is introduced into the dryer in a warm 

 condition, resulting in that much gain in the caloric which must 

 be furnished to accomplish the desired drying. 



Waste gases for Drying may be most economically accomplished by using the 

 drying. gases escaping from the grates of the boilers, and which com- 

 bine with the gases in the special generators. It is claimed 

 that there is thus produced an intense gas circulation, which is 

 very favorable to the residuum desiccation, without danger of 

 cooling or any loss of heat. It is claimed furthermore that 

 during this special drying the cossettes will not absorb any of 

 the gas combination, as the water they contain must increase 

 1700 times in volume before becoming steam, and that under 

 these circumstances there is created a current of vapor sufficiently 

 violent to prevent any direct contact between the cossettes and 

 the gas proper. 



Experiments have shown that to properly utilize this lost 

 heat from the boilers would necessitate the building of a very 

 large and expensive appliance. Furthermore, steam boilers are 

 rarely arranged as they should be, and an enormous amount of 

 gases is always liberated from them that cannot be utilized, and 

 that is unfortunately supersaturated with soot, their working, 

 moreover, being very irregular. 



The construction of a special furnace for accomplishing the 

 object in view, is the main point on which our attention should 

 be centered. It has been found desirable to obviate the contact 

 of the gases with the residuum cossettes, in order to prevent 

 their contamination. All combinations that have thus far 

 been devised are not very serviceable in their general work- 

 ing, from an economical standpoint, for the simple reason 

 that there always follows an enormous loss of heat through 

 radiation. 



