The Daily bulletin. [volume] (Honolulu [Hawaii]) 1882-1895, 1889-04-17

together and used as fertilizer,
than which for that purpose we have
found nothing better.
Following the fuel now, we have
the bagasse dumped in front of the
furnaces, where there is room to
hold enough fuel for half a days
run. The feeding of the furnaces
is done by hand through double
furnace mouth, which is always
kept so banked up with bagasse that
cold air is not allowed to enter.
There are only two furnaces, and it
takes one man to each. The CRATE
bars are of the stepladder style, and
answer well for the fine bagasse,
there being no waste of fuel through
the CRATES. Hot air pipes inserted
in the bridges are used with excel
lent results.
There are one pair tandem boil
ers, consisting of one tubular 10
6" and one Galloway 49, e., both
G. diameter, connected by steam
drum on top and water pipes below;
and combination boiler, similar in
its working, but in one piece 25' by
z, Galloway tubes and fue in one
end and tubular at the other.
Where the gases of combustion
leave the boilers their temperature
is about GOO degrees. And in order
to utilize as much of that waste
heat as possible we have placed at
the end of the boilers two super
heaters-not to superheat live
steam, but to superheat the collected
exhaust steam from every source
throughout the works. Said exhaust
steam is conducted through main
pipe into superhcaters at temper
ature of 215 degrees to 220 degrees,
and there being difference Of 395
degrees temperature between the
steam to be heated and the gases es-
Gaping toward the chimney. The
transmission of heat to the exhaust
steam is very considerable, for the
superheated steam with no increase
of pressure often reaches 450 de-
grees temperature and is never less
than 375 degrees. AS will be no.
ticed, this is now gaseous steam,
and temperature and pressure bear
no relation to each other, and there
fore the vapor from any Of the cells
of a multiple effect may be super
heated to Il temperature far beyond
that of live steam without increas-
ing the pressure or changing the
vacuum in pans, and then used in
the heating drum of following cell or
cells as shown in specifications of
patent. In the present mode of
working at Waiakea the superheated
exhaust steam runs the vacuum
cleaner, double-effect, vacuum pans,
and does most OF the heating in the
CHARTERS, but as soon as one more
cell has been added to the EFFECT"
the vapor from the first cell will also
be taken through portion of super
heaters, on which the waste gases act
later land return to the heating drum
of second cell under vacuum of s.
say, and with temperature equal
to that of live steam. There will
then be left in the gases enough of
heat to produce good draft with
chimney 100 feet high. IF, how
ever, it is desired to carry the util-
izing of heat further, forced combus-
ton may be adopted and high chin
ney dispensed with.
In arranging new works of any
magnitude would prefer having q
multiple effect of five pans, arranged
two and two, set opposite each
other in pairs, and one-the first pan
at one end and so connected that
the superheated exhaust steam
would operate it, and the vapor from
it, rising from the boiling juice,
passed through section of super
heaters and returned to first cells of
each of the two pairs of pans, vacu-
UNI in first cell of the five being
about 81. In this way Of working
| the most extensive maceration or
diffusion of sugar cane may be car
ried out comfortably without any
fuel other than that furnished by
the bagasse or chips.
As arranged at present at Waia-
kea dilution of over 40 per cent.
may be made by maceration in the
whole juice, and all the work done
on the bagasse alone as fuel.
The crop runs from $500 TO 1000
short tons, and the daily output of
sugar 20 to 20 short tons in eleven
hours, crushing ten hours, and the
usual number of hands employed
about thirty.
When the above factory was start
ed and for several years after it
took over ten tons of cane and half
ton OF coal to make ton of sugar;
but after doing away with all open
pans and introducing double crush
ing and maceratlon with automatic
feeder on bagasse mill, automatic
vacuum cleaning pan, multiple eff
feet, experimenting exhaust steam
and vapor by the waste heat of the
spent gases of combustion on their
way to the chimney, improved bag
asse furnaces, filterpresscs for skim
mings and settings, ETC., the pre-
sent state of perfection has been
reached. 1t should also be men
toned that the quotent of purity of
first grade of sugar has been raised