Improvements in or Connected with Furnaces for Treating Air Preparatory to its Use in what is known as the "Cool Air Drying Process."
Year: 1887

page_text: Date of Application, 12th Jan., 1887
Complete Left, 12th Oct., 1887
Complete Accepted, 12th Jan, 1888
Improvements in or Connected with Furnaces for Treating Air
Preparatory to its Use in what is known as the "Cool Air
Drying Process."
I, PAUL EWENS of 87 Shirland Gardens, Maida Vale in the County of Middlesex
Civil Engineer do hereby declare the nature of my Invention to be as
follows:-
My Invention relates to apparatus of the description for which William Robert Lake
obtained Letters Patent No. 4546 of 1882 as a communication from R. S. Jennings.
In that apparatus the air to be used in the drying chamber is passed thereto in contact
with iron tubes heated by a fire and in practice it is found that the said tubes rapidly
wear away. The object of my invention is to prevent this defect and to provide
means by which a very effective action upon the air to give the desired result is
obtained.
According to my Invention I provide passages or tubes through which the air is
passed to the drying chamber which passages or tubes are made of refractory material
such as fire clay or any kind or mixture of refractory materials which will stand the
heating and cooling which they have to bear and these are heated by a fire in a furnace
after the manner in which the iron tubes are heated as described by the said William
Robert Lake or in other convenient manner. In these passages or tubes I place iron
either loosely as iron filings or small pieces or scrap or in the form of a lining or of
tubes or divisions which can be readily removed and replaced or in two or more of these
forms combined but preferably in a divided state such as iron filings or planings
or iron scrap or wire with which when in a highly heated condition the air to be
treated is caused to come into contact on its way to the drying chamber.
When the said iron becomes oxidized it can readily be removed and replaced by
fresh iron.
Dated this 19th day of January 1887
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, W.C.,
Agents for Paul Ewens.

page_text: Improvements in or Connected with Furnaces for Treating Air
Preparatory to its Use in what is known as the "Cool Air
Drying Process."
I, PAUL EWENS, of 87 Shirland Gardens Maida Vale in the County of Middlesex,
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:-
My Invention relates to apparatus of the description for which William Robert
Lake obtained Letters Patent No. 4546 of 1882 as a communication from Ralph Smith
Jennings. In that apparatus the air to be used in the drying chamber is passed thereto
in contact with iron tubes heated by a fire and in practice it is found that the said tubes
rapidly wear away. The object of my Invention is to prevent this defect and to provide
means by which a very effective action upon the air to give the desired result is
obtained.
According to my Invention I provide passages or tubes through which the air is
passed through the furnace to the drying chamber which passages or tubes are made of
refractory material such as fire clay or any kind or mixture of refractory materials
which will stand the heating and cooling which they have to bear and these are heated
by a fire in a furnace after the manner in which the iron tubes are heated as described
in the Specification of the aforesaid Patent granted to William Robert Lake or in
other convenient manner. In these passages or tubes I place iron cither loosely as
iron filings or small pieces or scrap or in the form of a lining or of tubes or divisions
which can be readily removed and replaced or in two or more of these forms
combined but preferably in a divided state such as iron filings or planings or iron
scrap or wire with which iron when in a highly heated condition the air to be treated
is caused to come into contact on its way to the drying chamber.
When the said iron becomes oxidized it can readily be removed and replaced by
fresh iron.
The accompanying drawing represents an arrangement according to my Invention.
Figures 1 and 2 being vertical sections at right angles to each other and Figure 3a
sectional plan. A is the furnace in which are the air heating tubes or passages B
and C which are made of refractory material and shewn as being lined with iron
sheeting bc forming extensions of the passages to the box D which constitutes a
regenerator for heating the incoming air, by the hot air escaping from the furnace
tubes B and C. This box has end plates d d in which are inserted tubes e through
which the incoming air passes as shewn by the arrows in dotted lines the said air then
passing through the tube C and by the passage or casing ƒ to and through the tube B
and through or past the iron therein and then as shewn by the full arrows around the
tubese (heating the incoming air) and escaping by the outlet g in proper condition
for supply to the drying chamber. His iron scrap which is placed in the tube B and

page_text: some may also be placed in the tube C. By opening doors at f2 in the casing the
scrap can be removed and replaced by fresh when necessary.
In some cases where the refractory material of which the tubes are made is
sufficient to resist the destructive influence of the heat to which it is subjected the iron
filings or iron tubes or lining hereinbefore described may be dispensed with.
Having now particularly described and ascertained the nature of this Inven-
tion and in what manner the same is to be performed I declare that what I
claim is
First. In apparatus for treating air preparatory to its use in the cool air drying
process a passage or tube or passages or tubes which at the parts which pass through
the furnace are made of refractory material and contain a lining of iron or tubes of
iron or iron in a divided form or as wire, substantially as described.
Second. In furnaces for treating air preparatory to its use in the cool air drying
process the combination with the furnace A and passage or passages (such as B and C)
with the preparatory heating box D substantially as hereinbefore described.
Third. In apparatus for treating air preparatory to its use in the cool air drying
process a passage or tube or passages or tubes which at the parts which pass through
the furnace are made of refractory material substantially as herein before described.
Dated this 12th day of October 1887.
PAUL EWENS.