Improvements in Furnaces or Apparatus for Heating Steam Boilers.
Year: 1889

page_text: Date of Application, 12th Mar., 1889
Complete Specification Left, 11th Nov., 1889-Accepted, 14th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Furnaces or Apparatus for Heating Steam Boilers.
I MARTIN BOECKER of Friedenshütte, near Morgenroth. Germany, Blast Furnace
Superintendent, do hereby declare the nature of this invention to be as follows:-
This invention relates to gas heating apparatus for steam boilers and is represented
in the accompanying drawing. It has for its object to remedy very serious defects
generally found in the construction of gas heating apparatus hitherto in use.
Owing
to the cold surfaces of steam boilers in general and of tubular boilers in particular the
heating gases are cooled to such an extent that they are not completely burned, a
considerable quantity escaping into the chimney without being utilized.. Even when
a preliminary heating is employed the temperature of the heating gases cannot be
increased to such a degree that the whole quantity of carbonic oxide gases will with
certainty be burned. According to this invention this defect, the presence of which
is proved by reduced evaporation is remedied by constructing the heating apparatus
as shown in the accompanying drawing. Fig. 1 is a longitudinal section, figuros 2
and 4 are cross sections and fig. 3 is a plan view. The arrangement corresponds to
the usual arrangement except as regards the peculiar intermediate construction g
between the chamber for mixing gas and air and the boiler. a is the gas conduit,
the gas inlet tubular pieces, c the firing grate for igniting the gases, d the channel
for leading air to support combustion, ee the chambers for mixing gas and air.
Above this chamber and under the tubular boilers is masonry or brickwork y. g.
(see Figs. 1 and 3) arranged in a grate like manner and which is heated to a rose
red heat.
By this means complete combustion of the gas mixture passing upward is attained
before the latter enters into contact with the boiler surfaces, and the heating is of such
intensity that any escape of unburned carbonic oxide gas is entirely obviated.
The grate like arrangement of the masonry or brickwork offers furthermore the
following advantages. 1. The gases which may perhaps arrive intermittently are
ignited with certainty. Even seven or eight hours after the fire is extinguished the
temperature of the masonry or brickwork is still so high that evaporation in the boilers
can still be effected.
2. The gas mixture is equally distributed over the whole cross section A. B. C. D.
It has been demonstrated by experiments that evaporation has been increased by
about 50%
The cost of applying my improved apparatus is slight; repairs of the grate-like
masonry or brick work will not often be necessary while on the other hand in
consequence of the fact that the flame does not strike against single parts of the
boiler only but is equally distributed repairs of the boiler become less frequent.
In the accompanying drawing the grate-like masonry or brickwork between the
channels for the air and the combustible gases on the one side and the boiler on
the other side is vertically arranged, it may however be constructed in horizontai
or any other suitable position if desired.
Although this arrangement has given excellent results particularly in conjunction
with tubular boilers it may be applied with the same advantage in upright and
horizontal boilers of any system.
Dafad this 19th day of March 1889.

page_text: COMPLETE SPECIFICATION.
Improvements in Furnaces or Apparatus for Heating Steam Boilers.
I, MARTIN BOECKER, of Friedenshütte near Morgenroth, Blust Furnace Superinten
dent, 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
slatement :-
in use.
This invention relates to gas heating apparatus for steam boilers and is repre-
sented in the drawing filed with my Provisional Specification. It has for object
to remedy very serious defects generally found in gas heating apparatus hitherto
Owing to the cold surfaces of steam boilers in general and of tubular
boilers in particular the heating gases are cooled to such an extent that they are
not completely burned; a considerable quantity escaping into the chimney without
being utilized. Even when a preliminary heating is employed the temperature of
the heating gases cannot be increased to such a degree that the whole quantity
of carbonic oxide gas will with certainty be burned. According to this invention
this defect, the presence of which is proved by reduced evaporation is remedied
by constructing the heating apparatus as shown in the drawings in which
Fig. 1 is a longitudinal section,
Figs. 2 and are cross sections; and
Fig. 3 is a plan.
The arrangement follows the usual method, except the peculiar intermediate
construction between the chamber for mixing gas and air, and the boiler, a is
the gas conduit, the gas inlet fubes, the firing grate for igniting the gases,
the channel for leading air to support combustion, ee the chambers for mixing
gus and air.
Above this chamber and under the tubular boilers is masonry or
brickwork (see Figs. 1 and 3) arranged in a grate-like manner and which is
heated to a rose red heat.
By this means complete combustion of the gas mixture passing upward is
attained before the latter enters into contact with the boiler surfaces, and the
heating is of such intensity that any escape of unburnt carbonic oxide gas is
entirely obviated.
The grate like arrangement of the masonry or brickwork offers furthermore the
following advantages. 1. The gases which may perhaps arrive intermittently are
ignited with certainty. Even seven or eight hours after the fire is extinguished
the temperature of the masonry or brickwork is still so high that evaporation in
the boilers can still be offected. 2. The gas mixture is equally distributed over the
whole cross section A B C D. It has been demonstrated by experiments that
ovaporation has been increased by about 50 % by the adoption of apparatus
according to this invention.
The cost of applying my improved apparatus is slight, repairs of the grate-like
masonry or brickwork will not often be necessary, while on the other hand in conse
quence of the fact that the flame does not strike against single parts of the boiler only
but is equally distributed repairs of the boiler become less frequent. In the drawings
the grate-like masonry or brickwork between the channels for the air and the com-
bustible gases on the one side and the boiler on the other side is vertically arranged,
it may however be constructed in horizontal or any other suitable position if
desired.
Although this arrangement has given excellent results particularly in conjunction
with tubular boilers it may be applied with the same advantage in upright and
horizontal boilers of any system.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the saine is to be performed, I declare that what I
claim is
In gas heating apparatus for steam boilers the interposition between the boiler and the

page_text: channels or conduits througli which the combustible gas and air are conducted of a
combustion chamber which is provided with grate-like masonry or brickwork y
substantially as shown in and described with reference to the accompanying
drawings.
Tand th: 1942
1000
M. BOECKER,
Per L. W.