Improvements in Apparatus for Calcining Cement Materials Hydraulic Lime, Plaster of Paris, and like Substances.
Year: 1888

page_text: Date of Application, 9th Nov., 1888
Complete Specification Left, 9th Aug., 1889-Accepted, 14th Sept., 1889
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Calcining Cement Materials
Hydraulic Lime, Plaster of Paris, and like Substances.
I, JOHN WILLIAM HENRY JAMES, of 9, Victoria Chambers, Westminster, in the
County of Middlesex, Engineer, do hereby declare the nature of this invention to be
as follows:-
The object is to provide efficient revolving apparatus of more simple construction
than heretofore, for calcining cement materials, hydraulic lime, plaster of Paris, and
like substances.
Under the first part I construct a rotating drum, whether tapering or cylindrical
and lined or not with refractory material, with feed appliances, gaseous or liquid fuel
and air inlets, so disposed at one end of the said drum that the substances to be
calcined, the heating flame, and the products of combustion all travel in the same
direction through the said drum.
Second. construct an annular feed supply way at one end of a revolver and feed
the substances to be calcined through the way forming the centre ring of the
annulus.
Third. provide or construct the drum with a jacket or ways through which air to
support combustion is caused to pass from the delivery to the feed end, and so
become heated before meeting the gaseous or liquid fuel.
The cross section of
the jacket or way is larger than at the entering end to allow for expansion by
heating.
Fourth. I admit the air to support combustion into the drum at a point in rear of
the delivery mouth of the feed way, so that the said substances to be calcined are
carried forward past the fuel supply openings.
Fifth. I construct drums of increasing diameter from the feed to the delivery end,
and fit the delivery end with a hood having an aperture for the escape of products
of combustion, and a space around the periphery for the discharge of the calcined
substances.
Sixth. I give motion to drums under ny invention by the agency by preference
of friction carrying wheels.
Seventh. The air heating jacket or passage is sometimes made in the form of a
spiral, that is to say, a spiral air passage is built within the jacket between the casing
and lining of furnace to keep the incoming air longer in contact with heating
surfaces.
Eighth. The inside of furnace, or combustion chamber is formed excentrically to
the shell in cases where material is being calcined that it is desirable to toss about
during the process of burning, or otherwise it is in section built within the circular
casing in the form of an oval.
Ninth. The inside taper lining of the furnace is when desired provided with spiral
corrugations to induce a regular feed forward when the furnace is revolving in the
direction of the spiral, or to produce a kneading action if the furnace is driven in
the opposite direction to that of the spiral.
Dated this 8th day of November 1888.
J. T. KING,
Agent for the Applicant.

page_text: Improvements
in
COMPLETE SPECIFICATION.
Apparatus for Calcining Cement Materials,
Hydraulic Lime, Plaster of Paris, and like Substances.
I, JOHN WILLIAM HENRY JAMES of 9 Victoria Chambers Westminster in the County
of Middlesex, 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:—
The object is to provide efficient revolving apparatus of more simple construction
than heretofore for calcining cement materials, hydraulic lime, plaster of paris, and
like substances.
Under the first part I construct a rotating drum, whether tapering or cylindrical
and lined or not with refractory material with fed appliances gaseous or liquid fuel
and air inlets so disposed at one end of the said drum that the substances to be
calcined the heating flame and the products of combustion all travel in the same
direction through the said drum.
Second. I construct an annular fuel supply way at one end of a revolver and
feed the substances to be calcined through the way forming the centre ring of the
annulus.
Third. provide or construct the drum with a jacket or ways through which air
to support combustion is caused to pass from the delivery to the feed end and so
become heated before meeting the, gaseous or liquid fuel. The cross section of the
jacket or way at the inlets to the combustion chainber end is larger than at the air
entering end to allow for expansion of the air by heating.
Fourth. admit the air to support combustion into the drum at a point in rear of
the delivery mouth of the feed way so that the said substances to be calcined are
carried forward past the fuel supply openings.
Fifth. I construct drums of increasing diameter from the feed to the delivery end
with a hood having an aperture for the escape of products of combustion, and an
outlet around the periphery for the discharge of the calcined substances.
Sixth. I give motion to the drums under my invention by the agency, by preference,
of friction carrying wheels.
Seventh. The air heating jacket or passage is sometimes made in the form of a
spiral that is to say a spiral air passage is built within the jacket between the casing
and lining of the furnace to keep the incoming air longer in contact with heating
surfaces.
Eighth. The inside of the furnace or combustion chamber is formed eccentrically to
the shell in cases where material is being calcined that it is desirable to toss about
during the process of burning. Or otherwise it is in section built within the circular
casing in the form of an oval.
Ninth. The inside taper lining of the furnace is when desired provided with spiral
corrugations to induce a regular feed forward when the furnace is revolving in the
direction of the spiral, or to produce a kneading action if the furnace is driven in
the opposite direction to that of the spiral.
In order that my invention and the manner of performing the same may be more
fully understood I have appended drawings showing one way of carrying my invention
into effect. The letters donote corresponding parts in all the views.
Fig. 1 is a longitudinal section of apparatus under my invention where producer
gas is used.
Fig. 2 is a cross section, the right half showing heated air inlets into the jacket
surrounding the conical drum, or combustion chamber, and the left half showing the
heated air inlets into the combustion chamber.
Fig. 3 is a sectional plan.
Fig. 4 is a cross section through box at feed end of revolver.
A hopper for reception of powdered material to be burnt. B feed screw for forcing
the material into combustion chamber Cincketed food nine
Dinclined drun

page_text: combustion chamber. E outer inclined cylinder forming jacket through which air
passes on its way to combustion chauber D. F friction rings. G friction rollers.
H spur wheel for rotating drum. J hood for reception of air after passing through
heater pipes. K heater pipes. L openings for admission of cold air. M pipe
conveying air from heater pipes K to hood J. Ninlets for heated air into jacket E.
inlets for heated air into combustion chamber D. P valve for regulating the
admission of gas from producers. Qgas uptake. Rannular gas port. S inlets into
annular gas ports R. T chamber containing heater pipes K. U downtake for waste
gases. V outlet for calcined material.
The action of the apparatus is as follows:-The powdered material to be calcined is
supplied to the hopper A by elevators or other suitable means, whence it is fed into
the combustion chamber D through the feed pipe C by means of the screw B, and by
the rotation of the drum is gradually caused to travel to the opposite or delivery end
of the combustion chamber, where it is discharged through the outlet V into trunks,
or other suitable means of conveyance.
The gas from producers passes through the uptake Q, and enters the combustion
chamber D through the inlets S and annular gas port R.
The air for supporting combustion is admitted through the openings L, and in this
case, after passing through the heater pipes K enters the hood J through the pipes M
whence it is admitted into the outer cylinder or jacket or annular space E enlarged at
the feed end to allow for expansion of air through the inlets N and finally enters the
combustion chamber D at a high temperature through the inlets O. The products of
combustion or waste gases after leaving the chamber T are led away through the
downtake U and may be utilized for drying slurry, heating boilers, or any other
suitable purpose.
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 :-
First. Apparatus substantially as described under the first part whereby the flames
and products of combustion and substances to be calcined all travel in the same
direction.
Second. In caleining apparatus an annular fuel supply way and central feed way
for substances to be calcined.
Third. Constructing calcining apparatus with means for supplying and heating air
substantially as setforth.
Fourth. Admitting air and substances to be calcined into calcining apparatus
substantially in the manner and for the purpose set forth under the fourth part.
Fifth. Calcining drums of increasing diameter from the feed to the delivery end,
foruning in conjunction with the outer cylinder or jacket a gradually increasing space
for the expansion of air as it becomes heated on its way to the combustion chamber,
and provided with a hood substantially in the manner and for the purpose set-
forth.
Sixth. Giving motion to calcining drums or furnaces under my invention sub-
stantially as setforth.
Seventh. Constructing taper calcining drums or furnaces with spiral air heating
ways.
Eighth. Constructing calcining drums or furnaces with an excentric or oval
calcining space substantially in the manner and for the purpose setforth.
Ninth. Constructing calcining drums or furnaces with spiral corrugations for the
purpose setforth.
Dated this Eighth day of August 1889.
Per pro J. T. KING,
J. Johnson,
Agent.