Burning Straw or Analogous Fuel.
Year: 1885

page_text: Burning Straw or Analogous Fuel.
I JOHN HENRY JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of said Invention for "IMPROVEMENTS
IN OR CONNECTED WITH FURNACES OR FIRE BOXES FOR BURNING STRAW OR
ANALOGOUS FUEL which Invention has been communicated to me from abroad
by Hugo Graepel of Budapest in the Empire of Austria Engineer to be as
follows:-
"
My Invention has for its object to provide means whereby certain of the
objections at present appertaining to the employment of straw or the like as fuel
are obviated My Invention is especially applicable to the furnaces or fire boxes of
portable Engines and I will describe it in that connection but I wish it to be
understood that I do not limit myself to the application of my Invention to this
particular description of furnace or fire box-According to my Invention I make
in the furnace or fire box an air channel or air channels which are continued
upwards and have an outlet or outlets so that the air which is admitted into the
said Channel or Channels passes out into the fire box or furnace and meets the
products of combustion from the fuel and ensures combustion thereof-Whilst not
necessarily limiting myself to the particular arrangement of the channel or channels
I prefer to make the air channels when used with the fire places of tubular boilers
of castings or casings in front of the tube plate so as to burn the products of
combustion before they enter the tubes and also serving as a guard to prevent the
tubes becoming clogged-One air channel may extend over the whole width of the
fire box or furnace but I prefer to use narrow air channels placed side by side with
a small space between them and 1 prefer to give the castings or casings forming
the channels a form which will constitute them a partial bridge or arch over the
fuel on the bars-The air may be admitted into the channel or channels from the
ash pit or pan through an opening which can be opened and closed and regulated.
by a damper.

page_text: Improvements in or Connected with Furnaces or Fire Boxes for
Burning Straw or Analogous Fuel.
I JOHN HENRY JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this invention which has been com-
municated to me, from abroad by Hugo Graepel of Buda Pesth in the Empire of
Austria Engineer and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This Invention has for its object to provide means whereby certain of the
objections at present appertaining to the employment of straw or the like as fuel
are obviated.
This Invention is especially applicable to the furnaces or fire boxes of portable
engines and I will describe it in that connection but I wish it to be understood
that I do not limit myself to the application of my Invention to this particular
description of furnace or fire box.
According to my Invention I make in the furnace or fire box an air channel or
air channels which are continued upwards and have an outlet or outlets so that
the air which is admitted into the said channel or channels passes out into the fire
box or furnace and meets the products of combustion from the fuel and ensures
combustion thereof I make the air channels when used with the fire places of
tubular boilers of castings or casings in front of the tube plate so as to burn the
products of combustion before they enter the tubes and also to serve as a guard to
prevent the tubes from becoming clogged. One air channel may extend over the
whole width of the fire box or furnace but I prefer to use narrow air channels
placed side by side with a small space between them and I prefer to give the
castings or casings forming the channels a form which will constitute them a partial
bridge or arch over the fuel on the bars. The air may be admitted into the channel
or channels from the ash pit or pan through an opening which can be opened and
closed and regulated by a damper.
And in order that the said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheets of drawings the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 is a longitudinal section and Figure 2 a transverse section of a fire box
provided with air channels according to my Invention, a is the fire door 6 the ash
pan lid the ash pan d is the air channel passing from side to side of the ash pan,
e is a small sliding door to regulate the admission of air to the air channel through
the openings at the side (there being preferably such a door at each side) fare the
air channels attached to and forming continuous air passages with the channel d
for which purpose openings are formed in the top of the channel d but of course
the channels d and f can be formed in one if desired, g are perforations in the sides
of the channels f'presented away from the tubes j-The channels f are shewn as
having a space between each (see Figure 2) but if desired there can be but one
wide channel f, h is a bar supporting the position of the tops of the channels f and
keeping them in line, ii are the grate bars and is a space between the air

page_text: channel d and the side of the fire box through which ashes drop into the backward
ashpan Z, a door m being provided through which the ashes are removed therefrom.
In some cases I do not require this space and then the air channel or channels f
can be put close to the fire box side and the channels d be dispensed with.
Figure 3 shews an arrangement of this kind where the air channel or channels f
pass from the rear of the ashpit and extend upwards and arch completely over the
top of the fire, n is a perforated supplementary air channel or pipe projecting up
into the bottom portion of the fire box. Figure 4 shews a modification where the
air channel or channels fare supplied with air by a pipe or pipes passing through
the boiler and having an inlet or inlets for air outside the sinoke box as at p, n³ is
a supplementary air supply pipe.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is
In furnaces or fire boxes for burning straw or analogous fuel the combination of
an air channel or air channels which admit air to the smoke or gaseous products of
combustion and act as a guard to the tubes or outlets from the furnace or fire box
substantially as and for the purposes hereinbefore described.
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