IMPROVEMENTS IN STEAM BOILER FURNACES AND APPLIANCES FOR ECONOMIZING FUEL, AND CONSUMING SMOKE
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I EDWARD HONYCHURCH of 52 Selwood Street, Rotherhithe in the County of
Surrey, Engineer do hereby declare the nature of the said Invention for
IMPROVEMENTS IN STEAM BOILER FURNACES AND APPLIANCES FOR ECONOMIZING
FUEL, AND CONSUMING SMOKE to be as follows:-
For these purposes the gaseous products of combustion are made to pass from the
furnace through a novel arrangement of tubular brick bridges, one in advance of
the other and a descending passage between them whereby a greater amount of
heating surface is utilized, and the gaseous products of combustion thoroughly
consumed.
The first of these tubular brick bridges is at the end of the furnace and rises as
is usual the products of combustion pass partly through the said tubular brick
bridge and partly over the same, whence they pass into the descending passage
formed between the said first tubular brick bridge and the second bridge, which is
a hanging bridge the said products of combustion thence pass partly through the
second tubular brick bridge and partly down the descending passage and then
underneath such bridge after which they meet at the back of the combustion
chamber whence they are caused to pass through the flues of the boiler and away
by the main flue.
By these means a large proportion of the heat contained in the products of
combustion is retained in the tubular brick bridges causing them to become very
hot thereby causing an almost perfect consumption of the smoke and consequently
an economy of fuel.

page_text: Figure 1 is a longitudinal section through the furnace of a steam boiler and
Figures 2 and 3 are cross sections through the furnace tube drawn respectively on
the lines 1, 1, and 2, 2, of Figure 1.
Figures 4, 5 and 6 are similar views to those above described showing a slight
modification in the construction of the bridges, like parts are marked with similar
letters of reference. a represents the shell of the boiler, b the furnace tube, c the
grate bars, d the bridge at the end of the grate, e the hanging bridge, f a downward
flue or passage between the two bridges, and g the combustion chamber.
The products of combustion pass partly over the bridge d and partly through
the tubular flues or passages d¹ formed or built therein, thence into the downward
flue or passage f whence part of such products of combustion pass partly through
the tubular flues or passages e¹ formed or built in the hanging bridge e and partly
underneath such bridge e after which they meet at the back of the combustion
chamber g after which they pass through the flues of the boiler and away by the
main flue.
If desired the bridge d may be made solid. In the construction shown at
Figures 1, 2, 3 the bridge d is shown formed with a series of cylindrical tubes or
passages passing through the upper part thereof, whilst the area of the hanging
bridge e is occupied almost entirely by similar tubes or passages e¹. These tubes
or passages d¹, e¹ may be formed in comparatively short bricks or lengths or they

page_text: may be in the form of bricks or lengths extending completely through the said
bridges and their exterior surfaces may be cylindrical, hexagonal or of other
convenient shape.
In the construction shown at Figures 4, 5, 6, the bridge d has the sides and
bottoms of its tubes or passages d' formed of fire bricks whilst a slab of fire brick
completes the tops thereof, and the banging bridge e is formed of fire brick slabs e
formed at the top with longitudinal ribs or distance pieces e extending from front
to back of such bridge e and at the bottom with short distance pieces e* at each
end thereof. By these means the said bridge e is made with tubular passages or
flues e¹ of an elongated section which in addition to being open at each end are
also open at the bottom thereby preventing the same from being choked by ashes
lodging therein.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
:
First Constructing steam boiler furnaces with tubular fire brick bridges de and
a descending flue or passage f between the same substantially as herein shown and
described and for the purpose stated.
Second: A tubular hanging bridge e and a descending flue or passage of between
the same and the bridge & which latter may be either tubular or solid substantially
as herein shown and described and for the purpose stated.
Dated the 7th 1...
Nmhan 10OOL