Improvements in Combustion Chambers of Furnaces.
Year: 1891

page_text: Date of Application, 16th Feb., 1891-Accepted, 11th Apr., 1891
COMEDIET PITIVATION.
Improvements in Combustion Chambers of Furnaces.
I, BRIERLEY DENHAM HEALEY, of Bamber Bridge, in the County of Lancaster,
Civil Engineer, 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 has reference to improvements in the construction of combustion
chambers of steam generators, salt evaporating pans, sludge drying floors, and
numerous other furnaces where solid fuel is used on the firegrate.
The combustion chamber is lined with saddles of metalline to an extent equal to
about one half the full length of the firegrate somewhat as shewn in the Specifica-
tion of my Patent No. 4601 A.D. 1886 excepting that the central part of the lining
is corrugated.
In addition to the said lining a hollow arch of metalline blocks is built over the
bridge, in which blocks are small ducts at the front, or underside, or back of the
bridge or the ducts may be put on different sides of the blocks.
The corrugated surface of linings presents an increased surface for recuperation
and also prevents the hydro-carbons from rushing up to the highest point before
they are superheated and fixed into combustible gases.
The lighter gases are thus divided into streams which flow between the corruga-
tions until they arrive at the hollow bridge where each stream of gas meets with a
jet of highly heated air and combustion is then completed.
In practice I have found that when about two square feet of metalline surface is
provided for each square foot of firegrate surface the combustion of the hydro-
carbons is so satisfactory that the presence of smoke at the chimney is practically
overcome.
And in order that my invention may be understood I have appended hereto a
sheet of drawings which illustrates the application of this invention to the furnace
of a steam generator of ordinary type.
Figure 1 is a transverse section of a boiler furnace shewing the corrugations in
the lining saddles.
Figure 2 is a transverse section of the hollow bridge which may be built either
upon a cast iron or brick foundation, and
Figure 3 is a longitudinal section of the part of the furnace to which these
present improvements are made.
Figures 4 and 5 shew alternate methods of forming in a rough way the corrugated
surface with firebricks, but which is not so effective or durable as the method of
lining with specially formed saddles of suitable curvature to fit up to the tube plates
or nearly so.
The furnace tube may be lined with saddles A about 14 inches thick, and over
the bridge B, is the hollow arch C, in which are ducts D. Air from the ashpit
enters the hollow arch at E, and is heated to the full temperature of the furnace.
The whole of the apparatus may be built with fireclay joints but I prefer it to be
built entirely with dry joints, and the composition of the metalline to be about
60 silica, 30 of alumina and 10 of peroxide of iron by weight.
A dust exit with faced door may be put under the centre of the bridge which is.
shewn of iron although brick bridges may still be used.

page_text: 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
The improved method of constructing combustion chambers of furnaces for the
prevention of smoke substantially as herein shewn and described.
Dated this 14th day of February 1891
B. D. HEALEY,
Applicant..