Improvements relating to Apparatus for Feeding Material to Drying Drums and the like.
Year: 1899

page_text: [Communicated from abroad by the Firm of FELLNER AND ZIEGLER, of Creuz-
nacherstrasse, Frankfort-on-the-Main, Brockenheim, in the Empire of Ger-
many, Manufacturers.]
Improvements relating to Apparatus for Feeding Material to Drying
Drums and the like.
I. HENRY HARRIS LAKE, of the Firm of Haseltine. Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
This invention relates to feeding arrangements for drying drums and the like.
The regularity in feeding drying drums is particularly difficult to maintain
when large masses of material have to be treated of a sticky, stiff or adhering
nature and for which ordinary conveying means such as screw conveyors and the
like are useless.
This is particularly the case with the muddy residue from the settling tanks
of town drainage, and equally so with the raw mixture for the manufacture of
cement. Certain conditions are required for the treatment of such materials.
The residue is constantly introduced into the tank which is arranged in the plane
of the flow so as to obviate unnecessary alterations of level and in consideration
of the great weights of the masses to be treated as well as of the increased
friction in the mass itself through an increase in the length of the conduits or
channels.
For this reason it is not advisable to place the collecting tank at such a level
as to cause the residue to gravitate towards the drying drum or cylinder.
Moreover in such case the variation in the inflow into the collecting tank would
produce a variation in the feeding of the drying drum and consequently affect
the drying process.
The use of conveyor screws is unsuitable not only on account of the great
friction but chiefly because of the tendency of the material to adhere to the screw
conveyor and interfere with its working.
The improved apparatus is capable of working with a minimum length of inlet
conduit, if this be required, and effects with a reduced head of the materials to
be treated a regular feeding of the drying drum even when treating so called
difficult materials.
The conveying of the material to where it is to be treated further is effected by
first conveying it to an intermediate place provided with a tank or for continuous
working with two tanks, of sufficient size to hold enough of the material for
several hours working. This tank is connected by a pipe with the depositing
place of the materials and by means of an air pump or a steam condenser, a
vacuum can be created in the tank so that by opening the inlet valve of the
supply pipe, the atmospheric pressure forces the materials into the tank.
The exact position of this intermediate tank must be decided according to
conditions of friction in the pipe.

page_text: After the intermediate tank has been closely filled the supply pipe is closed
and a small force pump is set working and delivers the materials in an even flow
through a high pressure pipe.
This arrangement of intermediate supply has moreover the advantage of creat-
ing an impulse for moving the materials at the centre of the supply pipe partly
by suction and partly by forcing, and so obtain a much better effect than if the
driving force or pressure were applied at the far end of the pipe which naturally
would produce much greater friction of the material along the entire length of the
conduit.
The pressure of the force pump may, be somewhat increased towards the end
of the discharging operation so as to compensate for the decrease in the weight
of the material.
.
*
The material is forced through a pipe into the rotary drying drum of any suit-
able construction conditionally upon there being an interrupted supply at one
end and a continuous discharge at the other end of such drum.
D
1711 .
1
1000
HASELTINE, LAKE Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements relating to Apparatus for Feeding Material to Drying
Druins and the like.
"T
I, HENRY HARRIS LAKE, of the Firm of Haseltine. Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, 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:-
This invention relates to feeding arrangements for drying-drums mixing, appa-
ratus and the like...
:
The regularity in feeding drying drums or the like is particularly difficult to
maintain when large masses of material of a sticky, stiff or adhering nature 'have
to be treated, for which material ordinary conveying means such as screw 'con-
veyors and the like are useless.
1.
This is particularly the case with the muddy residue from the settling tanks of
town drainage, and equally so with the raw mixture for the manufacture of
cement.
'
Certain conditions are required for the treatment of such material. The residue
is constantly introduced into the tank which is arranged in the plane of the flow
so as to, obviate unnecessary alterations of level and in view of the "great weights
of the masses to be treated as well as of the increased friction in the mass itself
through an increase in the length of the conduits or channels.
For this reason it. is not advisable to place the collecting tank at such a level
as to cause the residue to gravitate towards the drying drum or cylinder.
Moreover in such case the variation in the inflow into the collecting tank
would produce variation in the feeding of the drying drum and consequently
affect the drying process.
The use of conveyor screws is unsuitable not only on account of the great fric-
tion but chiefly because of the tendency of the material to adhere to the screw
conveyor and interfere with its efficient working.
The improved apparatus is capable of working with a minimum length of inlet
conduit, if this be required, and effects with a reduced head of the materials to
be treated a regular feeding of the drying drum even when treating so called
difficult materials.

page_text: The conveying of the material to the point where it is to be treated is further
effected by first conveying it to an intermediate place provided with a tank,
or for continuous working with two tanks, of sufficient size to hold enough of
the material for several hours working. This tank is connected by a pipe with
the place where the material is to be deposited, and by means of an air pump,
or a steam condenser, a vacuum can be created in the tank so that by opening
the inlet valve of the supply pipe, the atmospheric pressure forces the materials
into the said tank.
The exact position of this intermediate tank will be regulated by the condi-
tions of friction in the pipe.
After the intermediate tank has been duly filled the supply pipe is closed and
a small forcing pump is set working and delivers the materials in a regular
manner through a high pressure pipe.
This arrangement of intermediate supply has moreover the advantage of creat-
ing an impulse for moving the materials at the centre of the supply pipe partly
by suction and partly by forcing, and so obtain a much better effect than if the
driving force or pressure were applied at the far end of the pipe which would
naturally produce much greater friction of the material along the entire length
of the conduit.
The improved apparatus is shown in the accompanying drawing in which
Figure 1 is an elevation of the improved apparatus and
Figure 2 is a plan of the same.
A is the collecting tank into which the material flows. B is the intermediate
tank or vessel in which a vacuum is created by an air pump 'connected to the
conduit C or by a steam condenser after which the valve b is closed while the
valve a is opened thus allowing of the tank B being filled from the tank A; the
valve a is then closed and the valve 6 opened and a small force pump connected
to the conduit C¹ is put in operation.
The pressure of the force pump may be somewhat increased towards the end
of the discharging operation so as to compensate for the decrease in the weight
of the material.
The material is forced through a pipe E into the rotary drying drum F of
any suitable construction conditionally upon there being an uninterrupted supply
at one end and a continuous discharge at the other end of such drum.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is :-
1. A pneumatic feed arrangement for drying drums mixing apparatus and the
like characterized by the fact that between the collecting tanks and the drying
drum or the like there is arranged an intermediate tank, in such a manner that
its lower end is placed in immediate connection with the conduit to enable the
material to be dried, to be drawn upwards from such collecting tank and then
conveyed along by the action of a force-pump.
2. A form of construction of the feed arrangement claimed in Claim 1, char-
acterized by the arrangement of two intermediate tanks in connection with two
branches of the conduit.
3. A form of construction of the feed arrangement characterized by the employ-
ment of a pump for producing a vacuum in the intermediate tank to enable the
material to be drawn into the same and a separate pump for forcing the material
into the drying drum.
Doted this 2nd day of Novemb
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.