Improvements in Vertical Steam Boilers.
Year: 1895

page_text: Date of Application, 3rd Sept., 1895-Accepted, 26th Oct., 1895
Improvements in Vertical Steam Boilers.
I, PHILIPP Loos of 56 Sprendlingerstrasse, Offenbach, m, Germany, Founder
and Boilermaker, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention relates to that class of vertical steam boilers having "Galloway"
tubes and it has for its object to thoroughly consume the smoke and also to super-
heat the steam by means of the escaping hot gases of combustion thereby utilizing
the whole calorific power of the fuel.
And in order that my said invention may be properly understood I have hereunto
appended an explanatory sheet of drawings, whereon,
Fig. 1 is a vertical section of the boiler and Fig. 2 a horizontal section on the
line x-x Fig. 1.
Referring to the drawings:
Within the boiler shell a is built a fire box 6 which is preferably made of
corrugated sheet metal. This fire box is traversed by several Galloway tubes c
arranged crosswise in such manner that the ascending hot gases are compelled to
alter their course very frequently so that the greatest part of their heat is imparted
to the walls of the fire box.
The fuel which is fed into the fire box from a hopper e, whenever the damper
door f is raised, is burned upon the step grating o.
The fire bridge g rests upon a box or pedestal to which air gains access through
openings. Along the whole length of the fire bridge g are formed one or more
twyeres i through which the air entering at the openings in the box is conducted to
the combustion chamber in the form of a hot blast which whilst promoting combustion
prevents or aids in the prevention of smoke. The air current passing constantly
through the box and twyere also serves to keep the fire bridge cool thereby
preventing it being burned.
The steam, which is drawn off from the boiler by the valve e¹, is not conveyed
directly to the engine but is first caused to enter a spiral steam super-heating
pipe p (by preference made of copper on account of the tenacity and conductivity of
this metal) located in the flue d, which latter is made as narrow as possible
consistent with an efficient draught in order to keep the hot gases within the
combustion chamber as long as possible. This pipe p, which enters the flue at 7, is
so made that its convolutions increase in diameter as they go downward to the
bottom where the pipe is again bent straight up and led out of the flue at n. If
desired the end of the pipe p can be made to communicate directly with the
boiler and in this case the controlling valve e¹ would be fitted at the end n.
By making the coil pipe p with its convolutions broadening towards the base the
steam passing through it is fully exposed to the action of the hot gases escaping
through the flue.
The necessary boiler fittings are supplied as usual.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
consider novel and desire to claim is :-
1. A vertical steam boiler with Galloway tubes, having a constricted flue with a

page_text: steam superheating coil pipe located therein the convolutions of the pipe being
broadened out or increased in diameter towards the base, substantially as and for
the purpose hereinbefore set forth.
2. In a boiler of the class set forth, an air inlet box h surmounted by a fire
bridge provided with one or more twyeres i communicating with the box and
through which an air blast or current is delivered into the combustion chamber,
substantially as hereinbefore described with reference to the drawings annexed.
Dated this 2nd day of September 1895.
H. D. FITZPATRICK,
70 Wellington Street, Glasgow, Agent.