Improvements in or relating to Steam Generator and similar Furnaces.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Steam Generator and similar
Furnaces.
I, JOSEPH SHIPMAN, of Station Road, Deepcar, in the County of York, Engineer, do
hereby declare the nature of this invention to be as follows:
This invention relates to steam generator and similar furnaces or, the like and has
for its object to cause perfect combustion at the back of the furnace bridge.
At the back of the fire bars of the furnace of a steam generator of some well-known
type in the part usually called the bridge, I construct a chamber of suitable metal or
material preferably of cast iron, in the bottom of which is an opening admitting the
air which comes underneath the fire bars.
At the side of this chamber facing the fire front, I form. apertures, which admit a
certain quantity of the unconsumed gases into the chamber.
:
At the top of this chamber I form other openings which allow the mixture of air,
and gases to combine with the combustible, matter above the chamber thus securing
as near as possible perfect combustion.
I am aware that openings for air and steam or both have been constructed at the
back or bridge of a furnace, but according to this invention the pure air is .conveyed
underneath the fire bars to the mixing chamber, and by coming in contact with the
gases entering at the side of this chamber, and the mixture thus formed: issuing at
the top and coming in contact with the combustible matter by its instantaneous
ignition improved results are obtained
Dated this 3rd day of October 1908

page_text: to be performed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to steam generator and similar furnaces or the like and has
for its object to cause perfect combustion at the back of the furnace bridge.
At the back of the fire bars of the furnace of a steam generator of some well-known.
type in the part usually called the bridge, I construct a chamber of suitable metal or
material preferably of cast iron, in the bottom of which is an opening admitting the
air which comes underneath the fire bars.
At the side of this chamber facing the fire front, I form apertures, which admit a
certain quantity of the unconsumed gases into the chamber.
At the top of this chamber I form other openings which allow the mixture of air,
and gases to combine with the combustible matter above the chamber thus securing
as near as possible perfect combustion.
In the accompanying drawings
Figure 1 is a transverse section of one construction of the improved bridge.
Figure 2 is a plan of the same.
Figure 3 is a transverse section or modification ;
Figure 4 is a front elevation looking in the direction of the arrow in Figure 3.
Figure 5 is a longitudinal vertical section of a steam generator furnace fitted
with the improved bridge.
Like letters indicate like parts throughout the drawings.
I form a casting A constituting a chamber B. A series of holes C are formed
in the bottom of the casting A, another series of holes D are formed in the side
facing the furnace, and a third series of holes E are formed in the top of the casting.
The bridge is arranged at the back of the furnace so that the gases will enter the
chamber B through the openings D and there mingle with the air which comes from
under the fire bars through the openings C, the mixture then issuing into the flue
through the openings E.
In the modification shown in Figures 3 and 4, tubes D¹ are inserted in the
openings D, a wall in this case being formed in the chamber B to give additional
support to the tubes D¹.
If desired in either the constructions illustrated additional openings F for the
escape of the mingled gases may be made. The improved bridge is preferably con-
structed of cast iron and may be made in one or more parts as found convenient.
shown in Figure 5 the casting A is arranged to form part of the main furnace
bridge G.
As
I am aware that openings for air and steam or both have been constructed at the
back or bridge of a furnace, but according to this invention the pure air is conveyed
underneath the fire bars to the mixing chamber, and by coming in contact with the
gases entering at the side of this chamber, and the mixture thus formed issuing at
the top and coming in contact with the combustible matter by its instantaneous
ignition improved results are obtained.
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
claim is
1. The combination with a steam generator or similar furnace of a chamber such
as B arranged at the back of the furnace and having openings in its bottom,
front and top walls and with or without openings in its back walls substantially as
and for the purpose described.
2. The combination with a steam generator or similar furnace of a casting such
as A A¹ forming a chamber B and having openings in its bottom, front and top walls
with tubes such as D¹ inserted in the openings in the front wall and with or without
openings in the back wall, substantially as and for the purpose described.
3. The complete chamber for mixing air with the combustible gases of a steam

page_text: generator or similar furnace substantially as described and illustrated in Figures 1
and 2 or Figures 3 and 4 of the accompanying drawings.
4. The complete steam generator furnace and mixing chamber substantially as
described and illustrated in Figure 5 of the accompanying drawings.
Dated this 9th day of June 1899.
JOSEPH
SHIPMAN.
Boult & Wade,
Agents for the Applicant.