Improvements in or relating to Drying Ovens.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Drying Ovens.
I, CHARLES EMILE BOURRY, of No. 82, Rue du Rocher, Paris, in the Republic
of France, Engineer, do hereby declare the nature of this invention to be as
follows:-
In drying ovens in which trucks containing the articles to be dried are passed
through tunnels the air is inclined to take a thermal stratification in the tunnels
prejudicial to the regularity of the drying. Different arrangements have been
devised for remedying this defect and the invention which is the object of the
present application presents a new simple and practical solution of the problem.
It consists of employing simultaneously:-
1. Screens secured on the trucks which divide the tunnel into a series of
compartments.
2. Hollows or cells in two opposite sides of the tunnel placed in such a way
that these compartments communicate with each other, so that the current of
air is forced to follow a curve in the tunnel.
3. Heating apparatus or devices placed in these cells for heating the air. For
this latter purpose pipes can be used in which either steam from the hot gases
coming from the kiln is circulated or the whole or a portion of the saturated
hot air coming out of the drying oven. The hotter air coming from a kiln
or oven may likewise be introduced into the air from the drying oven. These
various heating methods may be employed simultaneously in the same drying
oven.
The cells of my improved drying oven may be arranged either in the top
and bottom walls or in the side walls of the tunnel as found most convenient
in practice.
Improvements in or relating to Drying Ovens.
I, CHARLES EMILE BOURRY, of No. 82, Rue du Rocher, Paris, in the Republic
of France, 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:-
In drying ovens in which trucks containing the articles to be dried are passed

page_text: through tunnels, the direction of the air current is the same as that taken by
the trucks whereby the air becomes constantly warmer. In this operation the
difficulty lies in obtaining an equable temperature and preventing the thermal
stratification of the air. Various devices have been proposed for attaining this
purpose.
The object of the present invention is a drying oven in which the problem is
solved in a novel, practical, and simple manner by means of screens secured
to the backs of the trucks combined with cavities arranged on both sides of the
tunnel in such a manner that each two compartments communicate with each
other so that the air is forced to take a serpentine course in the direction travelled
by the trucks and at the same time the air is gradually heated by means of
heating devices placed in the cells or cavities..
The accompanying drawing illustrates two forms of construction of the inven-
tion in Figs. 1 and 2 respectively, in vertical longitudinal, and in transverse
section, and in Figures 3 and 4 respectively in horizontal and in vertical section.
The trucks b having screens a at their backs move through the drying tunnel c
in the direction of the arrow a.
In Figures 1 and 2 the bottom and top of the tunnel have cavities & arranged
to alternate with each other in which heating pipes with gills e are located.
The number of the heating devices placed in each cavity increases from the
entrance end to the exit end. The arrows indicate the serpentine course
which the drying air takes in the tunnel, whereby the air is increasingly heated
by the heating pipes c. Hot air can also be supplied from another source if
desired through the channels f to the cavities d.
In Figures 3 and 4 the cavities are placed in the side walls of the tunnel
so that the drying air instead of passing in the vertical direction through the
tunnel as shewn in Figures 1 and 2, passes horizontally through the trucks
and tunnel. In other respects the arrangement of the drying tunnel is the
same as in Figures 1 and 2. The heating pipes e can be heated with steam,
hot gases, or even with a part of the hot air drawn off.
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 -
1. Heating and drying tunnel in which trucks are used for carrying the goods
to be treated, characterized by the arrangement that in order to obtain an equable
temperature the backs of the said trucks are provided with screens and corre-
sponding cavities are arranged in both walls of the tunnel, by means of which
cavities each chamber is connected with the next one, for the purpose of making
the current of air take a serpentine course in the direction in which the trucks
move and at the same time become progressively heated by means of heating
pipes or the like arranged in the cavities.
2. The improved heating and drying oven with travelling carriers, con-
structed. and operating substantially as described and shewn in the accompanying
drawings.
W. P. THOMPSON & Co.,
Of London, Liverpool, Manchester and Birmingham.