In cian 180 Sands: of diffusion sede from 100 eau out. , 
tings to 60 per cent. sirup, 156 pounds of water are evaporated. In- 
evaporating 125 pounds of diffusion juice to same density , only. 101. ets 
pounds of water are driven off. To evaporate 156 poun s of water i 
13.26, 9.10, and 6.76 pounds of coal are used for double, triple, and 
quadruple effects, respectively. For the same weight of cane anne ifs | 
giving 125 pounds of diffusion juice, the quantities ‘of coal consumed — 
would be 8.58, 5.89, and 4.44 pounds, respectively. To reduce this to ~ 
masse curte would require the same consumption as before, viz, 4.44 i 
pounds. One hundred pounds of cane chips will yield by diffusion — 
an average of 10 pounds of sugar for the w él State of Louisiana, way 
The coal consumed in evaporation, therefore, would be: 
Pounds 
Hatraydonble.eereh:c elt .)). 3, Jit. «3s caves pee due hela 13.02. 
GR Oubt tle ONC h er to LS Re aS) «2 i a eceye Wa nae ee were 10.33 
MOi 2 ad FUple CMCCbs 026 66 oS ange ts nice © done ele a ie ce eel es 2) BeOS y 
he above computation includes the exhaust steam from the/ypumps, 
centrifugal engine, etc. The quantity of steam required to run the © 
battery must be added to the above. It certainly would not amount 
to more than 2 pounds per 100 of cane used. 
With the best apparatus most economically arranged the total con- 
sumption of coal per 100 pounds of cane would be: 
‘ Pounds 
Hora double. crete oc. Tass Ss ek ee eee os a She ee AOS 
PMEFANGrIplo GHECG co. f 8s 5c s shee be cnn old oo Seo ee eee 12.33 — 
Hor a quanruple,etlect....! os i.c so. winless soe es ges os Geis cere aa se 10.88 
Reduced to 1,000 pounds of sugar from cane yielding an average 
of 10 per cent. of all sugars, the figures become: 
For 1,000 pounds sugar— Pounds. | 
Wath double een ete. Oe ha tenes oe on hes oo ECR a eee 1,502 *> 
Withstriple effect) 2 0 Po55. opt osc on bd RS ere Ree ee 1, 238 
With quadruple effect........... NG Tibiels ctéte beet lovs tude e,Sheey ale oisee Siecle 1, 088 
In all these calculations the coal is assumed to be of fair average 
quality, and to be able to convert 6 pounds of water into steam at | 
usual boiler pressure for each 1 pound of coal. In general, then, it 
may be said the quantity of coal required to make t ,000 pounds. of 
sugar by diffusion varies from 1,000 to 1,500 pounds, according to 
the system of evaporation employed. 
Diffusion can only be made an economical success when the best 
machinery and the niost economical methods are employed, The 
great objection which has been urged against it, viz, the increased 
‘consumption of fuel required, is entirely removed when the process — 
is carried on under the economical conditions which have been oe 
tioned. 
To attempt to introduce diffusion with old and worn-out apparatus, 
defective boilers, and open pans would simply be disastrous. It can 
only succeed when the highest mechanical skill, associated with the 
best scientific control, directs all the operations of the sugar-house. 
In the one experiment where actual weighings have been completed _ 
of the whole product, viz, the fourth run, the quantity of sugar made _ 
per ton is: 
Pounds 
SEDATE BGs ieee ose ee oe a eal, seals ESRD eee ate AG © Ve ie a eR en 165.5 
ECON GS fis Ss A Ue athe Pele Seu ware cod ond ote wee eae Re 45.9 
ENDER ES RA PK oka oc eae oBs cho Pees nico’ a! Bbw eahNG Lee ahs Rae ee ea ne 18.6 
LT ObaaL. 25 Sheree Ls eee Pe ae rks Rides 1 ae am ea 230.0 
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