Improvements in Arrangements for Drying Slurry by the Waste Heat from Cement Kilns.
Year: 1889

page_text: Date of Application, 12th Mar., 1889
Complete Specification Left, 30th Nov., 1889-Accepted, 4th Jan.,
1890
PROVISIONAL SPECIFICATION.
Improvements in Arrangements for Drying Slurry by the Waste
Heat from Cement Kilns.
1 GEORGE BATCHELOR of Grove Road Frindsbury in the County of Kent Foreman
of Works do hereby declare the nature of this Invention to be as follows:-
My invention relates to such arrangements for drying slurry as consist of chambers
communicating with the interior of a cement kiln in which chambers the slurry is
dried by the products of combustion of the fuel in the kiln which are caused to pass
through the said chambers and my said improvements consist in constructing and
arranging the said chambers and providing for the heating thereof by means of the
said products of combustion as hereinafter described.
According to my said improvements 1 form at the back of each kiln two chambers
one above the other which chambers are of such length and breadth that the joint
areas of the floors of the said two chambers is sufficient to admit of the quantity of
slurry required for one charge of the kiln being spread on the said floors in layers
of such depth as to insure the drying of the whole of the said quantity of slurry
during the burning of one charge in the kiln and by means of the products of
combustion passing from the kiln. I form the said two chambers of sufficient height
internally to admit of men entering and working in them when the dried slurry is
required to be removed from the floors and I form the floor of the upper chamber at
about the height of the top of the pan of the kiln and the floor of the lower chamber
at a height about midway between the top and bottom of the pan of the kiln and I
form a flue beneath the said lower floor. I incline both the said floors slightly toward
the kiln so that when covered with liquid slurry the depth of the layer of slurry on
each of the floors is greatest at the end adjacent to the kiln and gradually decreases
toward the further end. To provide for the passage of the products of combustion
from the kilns into the aforesaid chambers and the aforesaid flue I form openings
and passages in the backs of the kilns which passages communicate with the said
chambers and the said flue and to provide for the passage of the said products of
combustion from the said chambers and flues I form other openings and passages at
the farther ends of the said chambers and flues which latter openings and passages
communicate with the chimney shaft and are provided with dampers or other means
of closing or obstructing them when necessary. I provide the chambers with arched
roofs preferably of brick and concrete and 1. form the roof of each of the said chambers
of two rows of arches supported by the outer walls of the chambers and by a row of
piers built on the floors thereof. The hollow or valley formed by the arches of tho
roof of the upper chamber and the hollows or valleys between the several arched roof's
where the chambers are applied to a series of kilns built side by side constitute
tanks for containing wet slurry which when the floors of the chambers are to be
charged with slurry is allowed to flow onto them from the said tanks through shafts
or passages formed in convenient parts of the arched roofs and the walls supporting
them which shafts or passages are at other times closed by suitable means.
those of the walls of the aforesaid chambers which are at or near the ends farthest
from the kiln I form openings for ventilating the said chambers which openings are
partially or entirely closed by shutters or other suitable means when necessary.
Dated this 12th day of March 1889.
In
W. T. WHITEMAN,
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Arrangements for Drying Slurry by the Waste
Heat from Cement Kilns.
I GEORGE BATCHELOR of Grove Road Frindsbury in the County of Kent Foreman
of Works 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 such arrangements for drying slurry as consist of chambers
communicating with the interior of a cement kiln in which chambers the slurry is
dried by the gaseous products of combustion of the fuel in the kiln which are caused
to pass through the said chambers and my said improvements consist in constructing
and arranging the said chambers and providing for the heating thereof by means of
the said products of combustion as hereinafter described.
According to our said improvements I form at the back of each kiln two chambers
one above the other which chambers are of such length and breadth that the joint
area of the floors of the said two chambers is sufficient to admit of the quantity of
slurry required for one charge of the kiln being spread on the said floors in layers of
such depth as to insure the drying of the whole of the said quantity of slurry during
the burning of one churgo in the kiln and by means of the products of combustion
passing from the kiln. 1 form the said two chambers of sufficient height internally
to admit of men entering and working in them when the dried slurry is required to
be removed from the floors and I form the floor of the upper chamber at about the
height of the top of the pan of the kiln and the floor of the lower chamber at a
height about midway between the top and bottom of the pan of the kiln and 1 form
a fluc or flues beneath the said lower floor. 1 incline both the said floors slightly
toward the kiln so that when covered with liquid slurry the depth of the layer of
slurry on each of the floors is greatest at the end adjacent to the kiln and gradually
decreases toward the farther end. To provide for the passage of the products of
combustion from the kilns into the aforesaid chambers and the aforesaid flues I form
openings and passages in the backs of the kilns which passages communicate with the
said chambers and the said flues and to provide for the passage of the said products
of combustion from the said chambers and flues 1 form other openings and passages
at the farther ends of the said chambers and flues which communicate with the ;
chimney shaft and are provided with dampers or other means of closing or obstructing
then when necessary. I provide the chambers with arched roofs preferably of brick
and concrete and I form the roof of each of the said chambers of two rows of arches
supported by the outer walls of the chambers and by a row of piers built on the floors
thereof. The hollow or valley formed by the arches of the roof of the upper chamber
and the hollows or valleys between the several arched roofs where the chambers aro
applied to a series of kilns built side by side constitute tanks for containing wet
slurry which when the floors of the chambers are to be charged with slurry is
allowed to flow onto them from the said tanks through shafts or passages formed in
convenient parts of the arched roofs and the walls supporting them which shafts or
passages are at other times closed by suitable means. In those of the walls of the
aforesaid chambers which are at or near the ends farthest from the kiln I form openings
for ventilating the said chambers which openings are partially or entirely closed by
shutters or other suitable means when necessary.
My said improvements are illustrated in the accompanying drawing Figure 1 of
which represents in horizontal section three kilns of a row of kilns and the drying
chambers connected thereto the several kilns being marked respectively No. 1 No. 2
No. 3. Figure 2 represents one of the said three kilns in front elevation and the kiln
adjacent thereto in vertical section and the drying chambers of the next adjacent kiln
also in vertical section. Figure 3 is a back clevation of the drying chambers at the
back of the kiln No. 3 and Figure 4 is a longitudinal vertical section of the kiln No. 1
and the drying chambers at the back thereof. The lines on which the several sections
4

page_text: are taken are as follows-The section of the kiln No. 1 and its drying chambers
shown in Figure 1 is taken on the line A A Figure 4. The section of the kiln No. 2
and its drying chambers also shown in Figure 1 is taken on the line B B Figure 4.
The section of the kiln No. and of the parts at the rear thereof which section is also
shown in Figure 1 is taken on the line CC Figure 4. The section of the kiln No. 2
shown in Figure 2 is taken on the line D Figure 4. The section of the drying
chambers of the kiln No. 3 show in Figure 2 is taken on the line E Figure 4 and the
section Figure 4 is taken on the line FF Figure 1.
In the following description the said drawing is referred to by the letters and
figures marked thereon. The same letters and figures of reference indicate the same
parts in each of the several Figures of the drawing.
.
abc are the kilns the tops of which are covered with arched roofs and provided with
loading eyes as usual the arched roof of the kiln No. 1 being shown at a¹ in Figure 4
and that of the kiln No. 2 at a² in Figure 2 and the loading eye of the kiln No. 1
being shown at a in Figures 1, 2 and t. d¹² e¹e fare the several drying
chambers def being the upper chambers and the lower chambers. The
said chambers are of such length and breadth that the joint area of the floors of the
upper and lower chambers at the back of each kiln is sufficient to admit of the quantity
of slurry required for one charge of the kiln being spread on the said floors in layers
of such depth as to insure the drying of the whole of the said quantity of slurry by
means of the products of combustion passing from the kiln during the burning of one
charge therein. The roofs of the said chambors are each formed of two arches (as
shown at Figure 2) supported by the outer walls of the said chambers and by
piers rising from the floors thereof the piers being shown at d* e* in Figures 1 and 4.
gggg are the flues formed beneath the floor of the lower drying chamber of the
kiln No. 3. Other similar flucs are formed in corresponding positions beneath the
floors of the lower drying chambers of the kilns Nos. 1 and 2 but in the drawing
only one of the said other flues is shown namely that on the line of section in
Figure 1 which is shown in Figure 4 and marked h. In building the said drying
chambers I incline the floors thereof toward the kiln but on account of the small
scale to which the accompanying Drawing is made the inclination of the floors is not
shown therein. I have found that an inclination of about one in three hundred or
an inclination of about two inches in a chamber of about forty five feet long is sufficient.
The openings and passages by which the gases or gaseous products of combustion
from each of the kilns pass into the contiguous drying chambers and flues is herein-
after described. The said gases pass into the upper drying chamber through an
opening between the arched roof of the kiln and the upper part of the pan of the
kiln which opening is shown in Figures 1 and 4 with respect to the kiln No. 1 and
in Figure 2 with respect to the kiln No. 2 and is marked at in the said Figure 4.
The said gases also pass into the lower drying chamber through openings and passages
formed in the backs of the kilns as shown at as in Figures 1, 2 and 4 and tho said
gases pass into the flues beneath the floor of the lower chamber through openings
and passages also formed in the backs of the kilns as shown at a in the said
Figures 1, 2 and 4.
The openings and passages and flues by which the said gases pass from the said
chambers and the flues beneath the lower drying floor to the chimney shaft and tho
a: rangement of the dampers in the flues leading to the said chimney shaft aro
hereinafter described. The gases from the upper chamber of the pair of chambers
connected to each kiln pass downward into the lower of the said pair of chambers
through an aperture in the floor of the said upper chamber having a low wall built
at its edge to confine the slurry. The aperture in the floor of the upper chamber d'
of the kiln No. 1 is shown at d³ Figure 1 and the wall at its edge is shown at d' in
the said Figure and in Figure 4 and the wall at the edge of the aperture in the
floor of the upper chamber of the kiln No. 3 is shown at fa in Figure 2. The
gases from the flues beneath the floors of the lower chambers pass upward through
apertures in the floors of the said chambers at the edges of which apertures low
walls are built to confine the slurry on the said floors. The apertures in the floor of

page_text: the lower chamber of the kiln No. 2 and the walls at the edges of the said apertures
are shown in Figure 1 and marked respectively_ee. One of the corresponding
apertures and the wall thereof in the chamber d of the kiln No. 1 are shown in
Figure 4 and marked respectively d d and the walls at the edges of the corresponding
apertures in the lower chamber of the kiln No. 3 are shown in Figure 2 and
marked. The gases which pass through the lower chamber of each of the pairs
of chambers and the gases which pass into it as hereinbefore described from the Hues
below the lower of the said pairs of chambers and from the upper of the said pairs
of chambers pass from the several lower chambers by fluos provided with dampers or
shutters and connected to the chimney shaft the said last ramed flues being marked
respectively def in the accompanying drawing. The dampers in two of the said
flues are also shown in the accompanying drawing and marked respectively. To
facilitato the raising of these dampers when necessary in order to admit of the
passage of the gases from the kilns through the drying chambers and the flues to
the chimney they may be counterbalanced or partially counterbalanced by means of
a weight suspended by a chain connected to the said damper and passing over pulleys
suitably supported as shown at j in Figures 3 and 4.
(see Figure 2) are the portions of the arched roofs of the upper drying
chambers which I use as tanks for containing wet slurry. (see Figures 2 and 4)
are the shafts or passages through which the slurry is allowed to flow from the said
tanks onto the floors of the upper drying chambers when required and mm (see
Figures 1, 2 and 4) are the shafts or passages through which the said slurry is
allowed to flow from the said tanks onto the floors of the lower drying chambers.
When the kiln is in action the said shafts or passages 11 m m may be closed by any
'convenient means.
nn are the openings formed in the end walls of the drying chambers for the
purpose of ventilating thom when necessary which openings and also those at the
ends of the upper drying chambers above the roofs of the kilns (shon at o o in
Figure 2) are closed by shutters or other suitable means when the ins are in
action.
Although in the accompanying drawing I have shown my invention as
row of kilns built side by side I would observe that it is equally suitable i❤.
tion to kilns built separately.
lied to a
applica-
Having now particularly described and ascertained the nature of my said vention
and in what manner the same is to be performed I wish it to be understoc that I
make no claim to any of the details herein before described per se but I decl..re that
what I claim is :-
The construction of chambers for drying slurry and their connection with a ment
kiln or with cement kilns and with a chimney shaft as hereinbefore described; and
illustrated in the accompanying drawing.
Dated this 30th day of November 1889.
W. I. WHITEMAN
Agent for the Applican:-