THE EVAPORATION OF THE JUICE TO SYRUP. 



The Welner - Jelinek. The Welner-Jelinek evaporator is a 

 horizontal submerged tube apparatus differing very materially from the above, 

 and is designed initially to have the height of the column of liquid under 

 treatment as small as possible ; the evaporating tubes are shown in end 

 elevation and longitudinal section in Figs. 163 and 16!].. They are about 

 twelve feet long and three-quarters of an inch in diameter ; they are supported 

 by tube plates at either end and by two intermediate tube plates shown at /; 

 the tubes are generally arranged in nests of nine. The length and small 



TT T 



FIG. 165. 



diameter of the tubes necessitates the use of the intermediate tube plates, but 

 at the expense of the longitudinal circulation. On reference to the drawing, 

 Fig. 164, it will be seen that the steam or vapour entering at the valves / 

 circulates through three sets of tubes ; the rush of steam carries the condensed 

 water along with it, the latter being trapped at h in the boxes at the end of 

 the run. In some designs the condensed water is also trapped in the return 

 boxes. The level of the juice under treatment is shown at k, the vertical 

 height being only from 22 to 24 inches. The juice enters at m and leaves by 



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