IMPROVEMENTS IN MEANS FOR INCREASING THE EVAPORATIVE POWER OF STEAM GENERATORS
Year: 1874

page_text: PROVISIONAL SPECIFICATION left by John Chatterton at the Office of
the Commissioners of Patents, with his Petition, on the 9th March
.1874.
I, JOHN CHATTERTON,, of Glossop, in the County of Derby, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
MEANS FOR INCREASING THE EVAPORATIVE POWER OF STEAM GENERATORS," to be
Cas follows
My Invention relatés more particularly to Cornish and other internal
flued boilers, but is also applicable in part to externally fired boilers, and
the object of my said Invention is to increase the efficiency of such
boilers and to promote economy in the consumption of fucl.
To this end I in the first place arrange a spiral or coiled pipe within
the internal flue or within each internal flue, and I connect one end of
thie said pipe with the shell of the flue, and the other end with the shell
of the boiler, and preferably I make the last named connection above
the water line, so that water can circulate through the said pipe, and
"
'

page_text: become heated or converted into steam; or I connect the inlet end of
the spiral with a range of water tubes, which are employed to sustain
the fire, and through which the feed water is forced. I prefer to make
the said spiral oval in form in order that space for clearing out the flue
may be left below the spiral.
In some cases I apply similar spirals in the outer side flues.
In the second place I apply a water cylinder within the internal or
within each internal flue, the said cylinder being fitted with internal
tubes for the passage of the heated gases. The said cylinder is con-
nected with the boiler in such a manner as that it shall receive water
from the boiler and return the same or deliver the steam at a higher
point than the level of inlet into the said cylinder.
In some cases I may apply a cylinder in one or in both of the side
flucs. I may employ an arrangement of steam pipes, through which
jets of steam can be injected into the said internal tubes at intervals to
clear out the soot and ashes.
In the third place I apply clusters of straight water tubes within the
internal flue or within each internal flue, the water tubes in each flue
being connected together by means of branches, "tees," or elbows, or by
means of end castings, and being connected with the boiler for the inlet
of water and the outlet of water or steam, similarly as in the case of the
aforesaid water cylinder, or the feed water may be forced through the
said tubes into the boiler. I may also apply such clusters of tubes in.
the side flues or in one of them.
According to another part of my Invention, when employing water :
tubes in lieu of fire-bars I apply cast-iron covers to the said tubes, the
said covers being formed with air spaces, or being so formed that when
threaded upon or when placed upon the said tubes air spaces will be
formed. The said covers may be so formed as that portions of them can.
be readily replaced by new portions whenever desirable.
In another arrangement I cast hollow bars in clusters, and so arrange..
the spaces within the bars in connection with end passages as that the.
feed water can be forced through or be caused to circulate through the
said bars..

page_text: A remaining part of my Invention consists in applying an air conduit
within the internal fluc, or within each internal flue, the said conduit
serving to conduct air admitted or forced into the said conduit to a
split bridge," and to heat the same during its passage through the said
conduit, thereby promoting a more perfect combustion of the gases
gencrated in the furnace.
<s