Improvements in and relating to Apparatus for Heating and Distributing the Hot Air in Malt, Hop, and other Drying Kilns and Stores.
Year: 1892

page_text: Date of Application, 24th Dec., 1892-Accepted, 11th Feb., 1893
COMPLETE SPECIFICATION.
Improvements in and relating to Apparatus for Heating and
Distributing the Hot Air in Malt, Hop, and other Drying Kilns
and Stores.
I, HORACE WILLIAM JOYCE, of Rose Cottage, Great Yarmouth, in the County
of Norfolk, Maltster's Assistant, 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:—
My invention relates to apparatus for heating and distributing the hot air in
malt, hop, and other drying kilns and stores (of the kind that is set forth in my
previous. Patent, No. 18,410, A.D., 1891,) and has for its object to render such
apparatus more efficient and durable; and my present improvements refer parti-
cularly to the construction and arrangement of the protecting grate or guard to the
air heating pipe in the furnace for preventing burning of same; to the hot air
distributing, arrangements; and to other constructional details hereinafter fully
set forth.
I will describe my invention in reference to, the accompanying drawings in
which
Fig. 1 is a sectional elevation of a drying kiln ;
Fig. 2, a, side elevation of air-heating and distributing arrangements and
Fig. 2 a front elevation of a detail thereof;
Fig. 3 is a sectional plan on line - of Fig. 1;
Fig. 4, is a plan, Fig. 5 a back elevation of one side-section;
Figs. 6 and 7, vertical sections of the protecting grate, and
Fig. 8 a plan of fixing ring therefor;
Fig. 9, is a plan and Fig. 10 a section of junction plate hereinafter referred to.
Similar letters refer to similar parts in all of the figures.
Ais. the fire basket through which the heating pipe B passes, and to its base one
or more cold air intake, pipes H. having suitable regulating valves. is or are led
from the external atmosphere and connected suitably. K' is the usual perforated
floor of the drying kiln.K through which the hot air pipe C' leads and is surmounted
by, a. deflecting, and distributing cone R. J J represent any required number of
local distributing pipes, branching from the hot air pipe C and fitted with plug or
coned valves jj capable of operation from outside the well W when required, all
in the known manner. The above parts remain practically the same as described
in my above cited previous Patent.
be
According to my present improvements I make the heating pipe B, which is
preferably of oval, section, of thin wrought iron or steel plates so as to. better
conduct the heat, and I make the protecting grate G surrounding, the pipe B in
the furnace of corresponding configuration and in any convenient number. of sections
of cast iron, for example, as shown in Fig. 4. Both faces of the grate. may.be
inclined inwards. from the base as in Fig. 6,, or the inner side only may
inclined, as, illustrated in Figs. 1 and 7, so as. in effect to leave an air space S
intervening between the pipe B and the grate G. The protecting grate is, per-
forated with a number of apertures g, all of which are of truncated cone or
pyramidal, form, their, smaller, orifices; being arranged, externally or towards the
furnace, and arranged as it were to break joint with one another, and as near
together as is practicable so as to leave enough metal between them substantially
in the manner shown in Figs. 5, 6 and, 7; thus, the passage of, fuel through them

page_text: is obstructed and this with the air space S effectually prevents the burning of
the pipe B and bars, as has hitherto been the case. The sections of the grate G
are cast with a tongue gl at top and bottom, the lower one may fit into a corre-
sponding groove in the fire bars a, and the grate rests on same; the sections are
held together in position by a top ring T, which is cast with a groove t¹ fitting
over the top tongue g' of the sections, and so holding same together. The ring is
made in two or more sections bolted together at t t for easy removal and fixing.
As stated, the heater B is preferably oval and the hot air pipe C is circular and
in order to effect a good joint between them I interpose a plate P separately shown
in Figs. 9 and 10, having flanges or collars of such shape as to receive and allow
of the fixing and good jointing of both pipes B and C. Within the bore of the
upper pipe C the plate P is perforated or fitted with a grating p for obstructing
the free passage of air and so causing same to remain longer in contact with the
most effective heating surfaces of B and absorb as much heat as possible. To
distribute hot air more regularly and evenly in the kiln K I dispose supplementary
branch pipes F F leading from the hot air pipe C laterally aud upwardly as shown
Fig. 1 into the kiln K, and over the orifices I arrange deflecting plates ff and I
provide suitable valves such as the swivelling plates f¹ fl shown, with turning
knobs for use when required as hereinafter explained. Likewise I provide for
the top of pipe C in the kiln K a swivelling plate valve c which may be conveniently
pivotted upon the support of the distributing cone R as shown. From the hot air
pipe C I may lead other distributing pipes such as F1 F1 to any other place or
places requiring dry air. I arrange the main hot air uptake C as follows: At the
point where it passes through the floor K' I fix therein a plate L and I provide
a cast iron extension pipe C¹ of diameter adapted to fit concentrically over the
upper part of pipe C at c¹ and having a flange c which rests on the plate L 80
that the whole may be easily removed and refixed when required from the kiln K
and good jointing is ensured. To protect the malt, hops, or the like on the
floor K from undue heating I surround the extension C¹ in the kiln K above the
floor with a protector M as illustrated of any suitable refractory material and of
such diameter as to leave a suitable intervening air space m. Thus in operation,
to distribute hot air over the contents on the floor of kiln K only and dissipate
by diffusion the vapour or reek emanating therefrom, I open all the valves of the
distributing pipes in the kiln K and close all like valves in the well W and else
where; or by leaving open the well valves j, hot air will pass through the well W
and upwards with the other hot furnace gases through the floor K³, or if hot air
is required elsewhere I close all the valves in the kiln or some or any of them
and convey hot air by the branch pipes F¹ to the germinating rooms or other
store to which they may be led. The hot air by diffusion with the reek or damp
vapours prevents condensation and escape orifices are suitably arranged where
required.
Having now particularly described and ascertainedmy invention and in what
manner the same is to be performed I declare that what I claim is :-
In apparatus for heating and distributing the hot air in malt, hop, and other
drying kilns and stores.
1. The combination with the heating pipe B of a protecting or guard grate G
constructed in sections with coned or pyramidal orifices and an intervening air
space S, and arranged substantially as shown for the purpose specified.
2. The combination with the oval heating pipe B and the circular hot air pipe C
of the intervening junction plate P with perforation or grating p, substantially as
and for the purpose set forth.
3. The combination with the heating pipe B of the arrangement of hot air
distributing pipes F F with distributing devices and regulating valves substantially
as shown in Fig. 1, 2 and 24.
4. The use in combination with the hot air pipe C of the flanged extension C¹

page_text: and the fixing plate L and the protector M with intervening air space m, in the
kiln K, substantially as and for the purposes specified.
Dated this 24th day of December 1892.
For the Applicant,
J. C. CHAPMAN,
70, Chancery Lane, London, W.C., Chartered Patent Agent.