US898902A - Kiln. - Google Patents

Description

A J. w. LE GORE,

MLN.' APPLIOATIOH FILED JUNE 22, 1907.

Patented sept. 15,1908.

2 SHEETS-BEBER 1.

@vi hyena:

l i l l.To all whom it may concern.'

UNIFED srarns vrarnivr caricia..

JAMES W. LE GORE, 0F LE GORE, 1itlARYLrID.

KILN. l

Specification of Letters Patent;

'Patented Sept. 15, 1908.

Appli-cation led June 22, 1907. Serial No. 380,296.

Beit known that I, JAMES W. LE GORE, of Le Gore, in the county of Frederick and State of Maryland, have invented certain new and useful Improvement-s in Kilns, of which the following is a specification.

This invention relates to structures for calcining lime carbonates and especially to that form of structure known as per etual flame lime kilns in which the materia. is calciiied by the intense heat of the flame and hot gases reduced by fires operated in separate chainbers or furnaces so that no part ofthe fuel or ash is mixed with either the raw or finished product.

The objects of my invention are to provide a kiln that will affect a large saving in fuel; that. will turn out free of core a superior and regularly bumt product; that will be unequaled for ease of maintenance and operation; of simple construction so that any of its parts may be easily and cheaply repaired ane replaced without materiall afectinijr the other part-s; and which will e capable of large'capacity. Y

o carry out the objects of my invention I utilize the waste heated air from the chamber in which the burnt lime is cooling to provide a. means of draft for the furnaces, and thus avoid the necessity of )reheating the air by inea-ns independent of t ie kiln. 'lhe heated air from the cooling mass may be fed to the furnaces in a large enough supply to give all .the draft needed, or it may be augmented by an additional draft leading from the exterior into and through the fire box so as to prevent tlie grate from get-ting too hot.

The invention also comprises a'combustion flue or chamber of suitable dimensions above the furnace which is su flicient to give a thorough combustion so that all the gases are consuined before the intensely heated air ent-ers the burning or caleining chamber. This plan of compressing the gases serves to effect a great saving in fuel. This combustion chainber is a source of great economy even when the draft for the furnace is supplied by cold air, but a much greater saving is effected when the already heated air from the cooling lime is used. The draft may of course be supplied either from air which has been passed through the cooling lime, as above described, or when it is desired to secure more 'current than is practical -to draw through the cooling lime, the air may be drawn from the outside; but the desired amount of each current of air can readily be regulated by the use of common dampers adjustable at will by the operator to suit the different conditionsv of the heat and thel kiln.

Vith the aforesaid objects in view, my invention may be said to consist of the which will be hereinafter more particularly described, in' its preferable embodiment, illustrated in the accompanying drawings and then set forth by the claims at the en hereof.

In thedrawings accompanyiiir and form- Referring now to the details of the drawings by numerals: 1 represents the structure i which may be made of any desirable material such as concrete, masonry, etc., and, as illustrated in Fig. 1, there `are shown a battery of three kilns each of which is provided with a. charging opening atthe top and with a discharging opening at the bottoni, these being designated 2 and 3 respectivel charge is arran way throu run to carry olf the lime.

' As indicated in Fig. 3 each kiln has an arch-way 5 on opposite sides in which face the furnaces 7 and 8 and between each pair of kilns, as illustrated in Fie'. 1, there is a assage-way 9 leading eiit-iretly through the rihi structure so that an attendant may easily reach the furnaces on either side for the purpose of feeding or regulating the same. The interior of the kiln may be of the ordinary structure and is ireferably formed of inverted cone shape at die bottom so that as the material is burnt it settles at the bottom until a charge of thoroughly burnt lime is run oil through any form of discharging device which is illustrated diagran'imatically. at 10.

As illustrated in Fig. 3 each of the furnaces ed over a tunne or passaffeis provided with a [lue or chamber 14 and 15' provided with the usual dampers 22 and 24 The disgh duch .cars or wagons may eioo Y by which draft may be supplied from'the exterror whenever desired.

As illustrated 1n Fig. 3 the hot gasesfrom `the furnaces 7 and are not led directly into the kiln chamber but are lcd into combustion chambers'24 andgQG formed in the walls of the kiln and which finally lead into the burning chamber of the kiln at the oints designated 2S and 30. By means of trese combustion chambers 2 -1 and 26 there is a thorough combustion before any hot gases are permitted to pass into the kiln.

Before proceeding with the description of` the modified forni of my invention, it may be best to briefly state that although more perfect results may be obtained by 'using the dampers 18 and 2O and-obtaining the draft entirely or partially, as the occasion reuires, from the air which passes through t e coolinO lime in the inverted cone shaped bottom of the kiln, and while I consider that the method of burnin"r lime by obtaining the draft from the air which passes through the cooling lime as just described, is an essential part of my invention, yet a good measure of success may be obtained by the use of the kiln illustrated in the'modified fornr of 1n invention shown in Fig. 4 in which the c raft is supplied entirely from the exterior through the dampers in the ashits. P In the operation of my kiln, after the furnaces are started and the first charge of lime is drawn ofi', the succeeding charges settle into the inverted cone shaped bottom and are permitted to stay there, before being drawn off, luntil cooled. Duringthe cooling, the heat which is naturally lost, is led from the coolinfr mass through the flues 14 and 15 into the asth-pits of the furnaces 7 and 8, the

'amount of draft being. controlled by the dampers 18 andy 20. The air fed to the furnaces is thus effectuallyheat-ed and if the heat is too intense at the time when the mass is first cooling ofi' a further supply of air may -be drawn from the exterior solas to prevent any burning of the grates and the dampers may be regulated to produce the best results by using either preheated draft alone, or the exterior draft alone, or both together. And

owing to the combustion chambers 24 and i 26, the fuel 1s thoroughly consumed before 1t is passed into the burning chamber. It will be readily seen that by supplying hot air for the draft, the rapid generation of all the gases contained in the fuel is greatly increased so that thorough combustion is more readily produced in the combustion chamber before 'reaching the producttobe heated in the calcining chamber. The combustion chambers have the further func-tion of preventing any direct cold or unheated air from entering the kiln and deteriorating the product. By utilizing the hot air for the fires or furnaces and having all the gases passing from the furnaces through the combustion chamber, I

gases from the fuel consumed.

combustion chamber located within the wall of the kilnis that by making this chamber'of the proper length, I obtain the. proper amount of spate'for the curing, soaking, and finishing calcining the lime thoroughly befonv it reaches the part of the kiln where it is cooled, and thus I )revcnt any core from passing through the ltiln.

It is obvious that changes may be made in the form of my kiln and in the furnaces and combustion chambers and I do not limit myself to any special .construction or any particular material but refer to the appended claims to )oint out the scope of my invention.

lVhat claim as new is:

1. The method of burning lime or other material which consists in leading all the gases from the furnaces through a combustion chamber in the walls of the kiln of sufficient dimension to insure )ractically complete couibustion and to aflord room within the burning chamber-of the kiln for the proper curing and caleining of the lime.

2. The method of burning lime or other material which consists in leading the heated air from the cooling chamber through the naces through a combustion chamber in the walls of the kiln of sufficient dimension to insure practically complete combustion and to afford room within the burning chamber of the kiln for the proper curing and calcining of the lime, whereby as the lime is cooled in the lower part of the kiln heated air is drawn therefrom and led into the furnace and then into the kiln at a height to afford combustion and form a space for the burning and calcining of the lime.

3. A kiln comprising a burning chamber, a cooling chamber at the bottom thereof, a discharge chamber under said cooling chamber, a furnace, and a flue or passageway leading directly from the cooling chamber to the furnace, whereby air is drawn directly through the cooling lime and used for the draft and dampers controlling the said flue or passageway from the cooling chamber to the furnace, and said kiln also having a chamber l above the cooling chamber of sufficient dimension to insure the proper curing and calcining of the lime.

4. A kiln comprising a burning chamber, a cooling chamber at the bottom thereof, a discharge chamber under said cooling chamber, a furnace, and a flue or'passage-way leading directly from the cooling chamber to the-furnace, whereby air is drawn directly through the cooling lime and used for the drafthand a combustion chamber in the wall of the kiln of sufficient dimension to insure practically' complete combustion and to form a burning obtain the full power and benefit of' allthe Y Another advantage due to the use of the furnaces, leading all the gases from the fur- 'chamber between the entrance,`A of the coming a chamber below the entrance of the coxnf bustion chamber into the kiln and the aforebustion chamber in the kiln to permit the said cooling chamber and said combustion burnt materlal to thoroughly calcule' before chamber conducting all the gases to the burnbeing cooled.

V5 ing chamber. Signed by me at Vashi-igton, D. C. thi:` 15

5. In a kiln, a burning chamber, an ex- 19th day of June 1907.

. teror furnace, and a combustion chamber JAMES W'. LE GORE.

between said furnace and said burning Witnesses: ,l chamber of suiicient dimension to insure HENDERSON F. HILL',

10 practically complete combustion and form-A H. S. IMIRIE.

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