EVAPORATION 



355 



The scheme has been described by Whitehead/^ and its mathematics fully 

 discussed by Svorcik.^^ 



Recently it has been put into operation by Prache and Bouillon (British 



Fig. 207 



patent 26065, IQOS)- They employ an injector called a thermo-com- 

 pressor. As applied to a triple efifect this system is shown diagrammatically 

 in Fig. 210. Live steam enters at a and aspirates and compresses a portion 



Fig. 20S 



of the steam evaporated from the boiling liquid. This regenerated steam 



then re-enters the calandria along with the supph^ of low pressure steam at b. 



This sj'stem has been installed at the beet sugar factory at St. Leu 



