Improvements in or relating to Means or Apparatus for Utilizing Heated Gases and other Products of Combustion from Boilers, Furnaces, and the like, for Heating and Drying Purposes.
Year: 1895

page_text: Date of Application, 20th July, 1895-Accepted 21st Sept., 1895
COME LIE
Improvements in or relating to Means or Apparatus for Utilizing
Heated Gases and other Products of Combustion from Boilers,
Furnaces, and the like, for Heating and Drying Purposes.
I, SAM SMITHSON, of Brights' Cottage, Heckmondwike, in the County of York,
Manufacturing Chemist and Dyer, do hereby declare the unture 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 relates to improvements in means or apparatus for utilizing the
heated gases and other products of combustion arising from the consumption of coal
and other fuel in furnaces, say for example of steam boilers and the like, for heating
and drying purposes.
Hitherto the said heated gases and products of combustion from such furnaces
have frequently been allowed to pass from the flues direct to the chimney and to
escape therefrom without being further utilized. Now the object of this invention is
to employ the said heated gases and products of combustion for heating air
admitted to a chamber containing preferably, though not necessarily so, a slowly
revolving cylinder through which the said heated gases and products of combustion
pass on their way to the chimney.
According to this invention the said heated gases and products of combustion are
conveyed from the flues, say of a steam boiler to a chamber from which they pass
to the interior of say a slowly revolving cylinder provided at a suitable distance
from each of its ends with a circular dished baffle plate or diaphragm. The said
revolving cylinder is interposed between the chimney and boiler flues, and it is
arranged to revolve within a chamber to which air is admitted, through an aperture,
The revolving
or drawn or forced by a fan or blower, or equivalent means.
cylinder is also provided with any required number of longitudinal tubes which ruu
the whole of its internal length, and they are employed for receiving the air-after
the air has swept or passed over the whole of the outer periphery of the revolving
cylinder and conveying it back again to a hot air chamber interposed between the
chamber that receives the heated gases and products of combustion, and the end of
the revolving cylinder. The external peripheries of the longitudinal tubes are
kept cleaned by a quantity of ashes, slag, or it or their equivalents placed within
the revolving cylinder.
The air to be heated is admitted to the air chamber at the hottest part of the
external periphery of the revolving cylinder and after passing over the entire
external length of the same is caused to enter the longitudinal tubes which convey
it again to the hottest internal part of the said revolving cylinder before delivering
it into the hot air chamber.
In the drawings I have shown the apparatus applied for receiving the heated
gases from the flues of a number of steam boilers, but I would distinctly have it
understood that it may be used in combination with other furnaces or flues.
Fig. 1 is a longitudinal section of apparatus constructed according to this
O invention.
Fig. 2 a transverse section on line xx Fig. 1.
Figs 3 and 4 are elevations looking at opposite ends of Fig. 1.
Fig. 5 is a front elevation, and Fig. 6 a plan looking, at the top of apparatus
shown at Fig. 1.
W
7 and are respectively an end elevation and a plan looking at the top

page_text: snowing the application and combination of the apparatus with a series of
boilers.
A is the air chamber, B the hot air chamber, and C the chamber for receiving
the heated gases and other products of combustion from the boiler or other flues,
all of which may be of brick or stonework. The chambers A and B may be covered
with iron or other metal plates upon which bricks may be laid. If desired the
side and end walls may be continued upwards, as shown by dotted lines at Figs. 2
and 5 to form a drying chamber above the chamber A or chambers A and B.
The chamber C is connected to the flues of the boilers or other furnaces by a
flúe D, and from the hot air chamber B are two outlets E and F provided with
dampers e and for purposes to be hereafter described.
G is an aperture for the admission of air to chamber A, which air may either.
pass therein at the ordinary atmospheric pressure, or be drawn or forced therein or
therefrom by means of a fan or Roots' blower, (not shown in the drawings) or by
the chimney or other equivalent means.
The air chamber A is also provided with windows A' A² for inspection purposes
and with an opening closed with a door A³ as well as with air inlets closed with
covers A+.
His an aperture or manhole provided with a door or covering for admission to
the hot air chamber B.
The above described chambers A, B, and C are interposed between the chimney
(not shown in the drawings) and the boilers, so that the smoke, heated gases, and
other products of combustion are conducted through them, as hereafter described,
prior to passing to the chimney.
1 is a cylinder which is mounted within the air chamber A on pulleys J, or other
convenient and suitable means, and is preferably, though not necessarily so, caused
by worm gearing K (or other equivalent mechanism), actuated from any convenient
source of power, to revolve very slowly say for example one revolution in about
eight or ten minutes. The cylinder I may be made say of iron plates rivett.ed
together in a similar manner to the shells and flues of Cornish or Lancashire boilers,
and is, say for example, about thirty feet in length and six feet in diameter, and if
desired may be provided with one or more manholes (having suitable coverings) for
cleaning and other purposes. The cylinder I is provided with closed ends 1' 12 to
which are fixed the pipes L L by which a communication is made from the interior
of cylinder I respectively with the chamber C and the chimney. The pipe L
is arranged to pass from the chamber C to the inner end of revolving cylinder I
through the hot air chamber B as shown. At a suitable distance from the ends I' I2
of the revolving cylinder, and within the same, are fixed, by any suitable means
such as staying pieces m, the dished diaphragms or baffle plates M M which prevent
the smoke, heated gases, and other products of combustion from passing from pipe L
to pipe L' directly through the cylinder I. Between the outer periphery of the
baffle plates M M¹ and inner periphery of the cylinder I are provided any desired
number of longitudinal air tubes N of the same or varying diameters, and arranged
in circumferential rows so that the centres of the tubes do not all come on the same
radial lines. In the drawings I have shown four circumferential rows of tubes-the
two outer rows may be, say for example, one and a half inches in diameter and about
say four inches pitch, whilst the two inner rows are say one inch in diameter and
about the same pitch.
Each air tube N is made to run the whole longitudinal length of the cylinder I
and to project a suitable distance beyond the ends 112 of the cylinder, and it is
provided at each end with a screw thread for the reception of a nut or lock nuts,
whereby the air tubes N also form longitudinal stays. Two or more rings O may
be rovided as bearers for the air tubes N between the ends 1' 12. The inuer ends
of the air tubes N are arranged to communicate with the hot air chamber B as
shown; the division wall A' being employed to prevent any communication between
the two chambers A and B.
In order to remove soot and other products of combustion likely to be deposited