Improvements in Furnaces and Flues for Steam Boilers.
Year: 1899

page_text: Date of Application, 9th May, 1899-Accepted, 8th July, 1899
COMPLETE SPECIFICATION.
Improvements in Furnaces and Flues for Steam Boilers.
I, KONRAD BAUER, of Glöckleinsgasse, 1, Nürnberg, in the Empire of Germany,
Gentleman, 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, and accompanying drawing, that is to say:-
-
In the industrial utilization of heat, it is practically very difficult to utilize
to the greatest extent possible the heat capacity of the fuel, as from the direct
passage of the hot gases to the chimney the principal part of their heating value
is lost.
The present invention has for its object the attainment of 25-30 per cent.
better utilization of the fuel (wood, coal, peat), by an arrangement of the grate
and flues for steam boilers, by which the hot gases are brought back under and
over the grate, so that the more complete utilization of the heating effect of the
smoke gases is effected.
The principle of the invention is illustrated in the accompanying drawing,
in which:
Figure 1 is a longitudinal section through the fireplace;
Figure 2 is a section on the line y-y, Figure 1;
Figure 3 is a section on the line, Figure 1.
When in operation, the hot fire gases, after their circulation in the direction
shown by the arrow in Figure 1, pass through an opening a in the top of the
smoke chamber A, and thence through a lower opening 6 communicating with
the flue to the chimney, and through an adjustable damper B direct to the
chimney. When the firing has proceeded so far that an active combustion and
a so-called "good draught" are attained, the passage of the gases to the chimney
is stopped by the damper B, and their course is changed so that they pass to
the passage or flue C shown in Figure 2.
This passage or flue terminates below the fire grate D in smoke chambers F, F¹
and G, separated by a partition E. In the smoke chamber F the gases rise and
pass, as shewn in Figure 3, into smoke tubes K arranged between the two par-
titions H and J, of which six are shown by way of illustration, but of which
any suitable number may be used. Here the hot gases give out their available
heat, so that the useful work obtained is increased. The three lower ones of
these tubes are arranged in and pass through the partitions or walls H and J,
whilst the three upper ones, of different length, pass only through the wall H.
From the three upper tubes the gases pass through the firebars, whilst the
gases from the three lower ones pass direct to the passage or flue L.
The surplus of the gases entering the smoke chamber F1 pass out through an
opening c arranged above the firegrate D¹, and are carried forward by the draught
of the fire, and aid in utilizing the heat from the latter.
The smoke gases passing out from the passage C into the smoke chamber G,
by the partition E, are discharged up through the openings d in a pipe M which
is also arranged between the walls H and J, against an inclined wall or partition /

page_text: at the back of the grate D, through the intermediate space between the said
partition and the smoke chamber A, mix with the fire gases, and also add to the
useful effect obtained from the heat.
The gases passing from the firegrate D through the chamber A to the passage
or flue C move actively through the latter. Bent tubes N and O provided with
dampers open into the said flue, and through them air is drawn in, which passes
on with the gases coming from the smoke chamber A.
By the novel method of arrangement for passing the gases under and to the
firegrate, in such manner that the gases pass through the openings a and b
through the passage C to the smoke chambers F, F, and G, through the pipes K
and along the partition wall Z, and thence through the passage L to the chimney,
a very considerable gain in the utilization of the heating properties of the fuel
is effected, and the annoyance of smoke is completely removed.
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:-
1. The improved method of construction and arrangement of the furnaces
and flues for steam boilers, in which the fire gases are brought back through
smoke chambers A, F, F, and G, and a passage or flue C; partly below and
partly above the firegrate, so as to obtain an improved utilization of the heating
capacity of the fuel, and a greatly increased percentage of useful effect.
2. In furnaces and flues constructed as described and claimed in Claim 1,
a passage or flue C, through which the firegases, after the heating and then the
cutting off of the direct communication with the chimney, are made to pass into
smoke chambers F, F', and G, separated by a partition wall E, so that part of the
gases are made to pass over, and part under, the fire grate.
3. In furnaces and flues constructed as described and claimed in Claim 1,
the pipes K fitted in the walls H and J, and through which the gases passing
through the passage or flue C and to the chambers F and F and utilized to
give out their heating capacity, are made to pass part through the firegrate and
part by the passage or flue L to the chimney.
4. In furnaces and flues constructed as described and claimed in Claim 1, the
tube arranged between walls H and J and provided with openings d through
which the gases from the passage C and the chamber G pass to and along an
inclined wall Z adjoining the firegrate D, so as to obtain a still further utiliza-
tion of the heat-giving capacity of the fuel.
ALU
1
1000
EDWARDS AND Co.,
65 and 66, Chancery Lane, London, Agents for the Applicant.