The Honolulu republican. [volume] (Honolulu, T.H.) 1900-1902, 1900-11-15
THE UTILIZATION OF
BielSsE As FUEL
How 20 Use Il so a. 20 Ges the
Best Results II
Steam

FgES fsf EsE&slENG Gse1sSf-l
/ "a paper BIZ Mr.. Hubert Esi~Oa- read BE-
/ fore the IouisizRs Sugar Planters As
Socisrion- Octohsr II. 1907
When requested by your secretary IN
prepare a paper for this meeting on The
/ Utilization OF Bsgas>e as Fuel 80 as to |
Get the Best Results in Steam the sub /
I iect had already been discussed in many /
phases in previous meeting and many /
salient points brought out then which II
viii t.e unnecessary 10 review now Chief
among the things brought out we're the
necessity for good furnace with thick
/ walls. lined with refractory substance
and NOT TOO large for the heating surface
OF the boiler: a proper and even distribu-
/ ton OF the bagasss on the CRATES: care
/ full regulation of the air supply which
| can =. governed by determinations of the
/ carbon dioxide in the chimney gases and
/ BY the use of a promoter and the use OF
/ a storage bin for any excess OF hagasss
L not used in regular running. which can
4 h. drawn on when there Is any delay IN
/ the operation of the mill. These things
L my own experience have shown to he alb
solurely essential. and it viii do no harm
10 call especial attention TO the fact that
most of our baeasse furnaces are TOO large
for the heating surface OF the boiler
which occasions a great loss in sending
an unnecessary amount of heat up the
chimney.
| But in this paper | will assume that
mately realized. and viii endeavor TO show
where further economy can be secured
if they are.
will base my data on a factory having
a grinding capacity of 500 tons of cane
per day. as representing an average con
dition in this state. will also use Q per
cent of the weight of the cane as repre-
senting the amount of fibre. Is per cent
the amount of solids in the juice. 5000
heat units per pound Of dry bagasse. and
40 F. as the temperature of water re-
turned to the boilers. as representing
the conditions of an average season. all
these figures being approximately the re-
suit of actual experience covering series
of years. We have for our basis then:
Pounds dry bagasse in 800 tons cane at
per cent fibre. 50 per cent mill extrac-
ton and II; per cent solids in the juice.
amounting to
1876 per cent of the cane. 100000
Heat units in l pound of dry
bagasse .. 5000
Heat units in one pound dry
steam at 100 pounds gauge
pressure ... l,lS'
Heat units in l pound of wa
ter at 40 F....... 13S
Net heat units required to
raise l pound of water at
f7O f. to condition of steam
!. at 100 pounds gauge pres
sure 1917
Heat units in bagasse from
800 tons cane 500. Soo.ON
For convenience in calculations these
$50. 100000 heat units at 1i.oD heat
units in a pound of carbon equals pounds
of carbon. 1885,.
Chemically 2.66 pounds of oxygen are
needed for the complete combustion 81
| pound of carbon. and as oxygen i'll the
air is approximately % per cent of its
weight. it follows that 10 pounds of all
are necessary to burn l pound of carbon
\ But it is very difficult. even in first-clas:
boiler practice. to use less than 30 pei
cent excess of air. and there would. there
fore. be used in the combustion to carbon
ioxide of pound of carbon 1I.23 pound:
of air After combustion. then. we would
thave 1925 pounds of gases. as follows
Pounds
Carbon dioxide 3-o'
Nitrogen. lo-Z'
Oxygen Id.
Multiplying each by its specific heat WI
have
al per degree
5 3.66 pounds carbon dioxide y
y .2210 equals .i942Z'
1926 pounds nitrogen y .243S
4 equals .,''-.'- -
= LIB pounds oxygen y .2115
y equals .-o''-''
III 1t would then. require. say i.352 III. I
! for each degree of difference between thu
Y temperature that the air enters the fur
K naces and the gases go up the chimney