US42501A

US42501A - Lime-kiln

Info

Publication number: US42501A
Authority: US
Publication date: 1864-04-26
Anticipated expiration: 1881-04-26

Description

0. D. PAGE;-

v Lime Kiln.

w M w I `UNITED STATES PATENT OFFICE.`

J(J. D. PAGE, OF GRAND RAPIDS, MIOHIGAN.

LIME-KILN.

Specifcation forming part of Letters Patent No. 42,50 l, dated April 26, 1864.

To all whom it may concern:

Be it known that I, O. D, PAGE, of Grand Rapids, in'the county of Kent and State of Michigan, have invented new and useful Improveinents in Lime-Kilns; and I do hereby declare that the following is a full and complete description of the construction of the same, reference being' had to the accompanying drawings, making part of this specification, in Which- Figure 1 is a perspective view with one-half of (the cupola removed to show the interior. Fi'g. 2 is a transverse Vertical section. Fig. 3 is a transverse horizontal section, and Fig. 4 is aninverted trans'verse section of the stack.

Like letters refer to like parts in the several views.

My invention relates to such a construction of kilns that lime-rock of various kinds can be successfully and economioally burned with either wood or coal, without the mingling of the ashes with the lime, while the peculiar form of the cupola and arrang'ement of the furnaces are such as to entirely prevent the escape of the heat (except by natural radiation) either while replenishing the fuel or drawing the lime, and securing at the same time a nniform burning` of the stone as it descends into the fire.

The kilns are perpetual in their operation, the lime being drawn once in from three to six hours, and as often replenished with raW stone at the top of the cupola.

From one hundred and fifty to five hundred bushels can be burned in every twenty-four hours, according to thesize of the kiln.

In the accompa-nyingdrawings, A represents the stack or cupola. This I usually construct of cut stone. to thirty-six feet. Its base is from sixteen to eighteen feet square, and its top from fourteen to sixteen feet square. I gain access to the top either by a bridge of trestle-Work or by stag- 'pletely covers the opening a.

little downward toward the front, as seen in the figure.

The front wall is arched over, as seen at D, leaving a passage for the discharge of the burnt linie, as seen at a. This opening is kept closed (except when opened for the discharge ofthelime) by the drop-slide E. This drop-slide is made of a strong plate of iron, which com- It is hinged by a strong round bar lex'tending into the Wall on either side of the opening a. The forward end is held up by a catch, b, in the front of the Wall. When the drop-slide is closed, the weight of the limestone in the cupola rests upon the floor O, and the inclined Walls c.

Below the drop-slide E the Wall upon which the hearth rests is inclined forward and down- Ward, as seen at c, and upon which the dropslide rests when open, and which supports it in an inclined position, forming a slide for the discharge of the lime into a car placed in the chamber below. This car is shown at F, and consists of an iron box with or without Wheels, and after the hot lime is discharged into -it, and the drop-slide E closed, can be drawn out by` the strap or chain F'.

Upon each side of the cupola where it begins to contract, as shown at (I, I construct fire chambers G G, which open into the interior of the cnpola by passages H H H H in the fire-brick lining of the cupola. The entranccs to these fire-chambers are from opposite sides of the stack, and are shown at I I in cross-Sections, Figs. 3 and 4, the flame from the fuel entering the interior of the cupola in a spiral curve, as indicated by the arrows in Figs. 3 and 4.

The interior of the cupola being' slightly Its height is from twenty-eight elliptical,th e fiame and heat are thus caused to permeate every portion of the stone contain ed in it, thus insuring a nniform distribution of heat throughout the interior.-

The floor of each fire-chamber is provided ing; or it may be built' by the side of a steep with a grate J, upon which the burning fuel bank.

The interior of the cupola is shown at B. This is lined With fire-brick, and is expanded at the top, as shown at B', and is contracted below the flnes, as shown at O, the front side being contracted less than the back side, as shown in Fig. 2.

At O' is shown a hearth,which inclines a rests. BeloW each fire-chamber is an ash-pit, K, Fig. 2, into which the ashes fall, whether Wood or coal is used, thus Wholly preventing the admixture of ashes with the lime. This is an important considerat-ion, forwhere Wood is used, if the ash is permitted to mix With the lime, the potash forms a soluble compound With carbonic acid, thus much injuring the integrity of the cement formed from the lime in its recrystallization. and in the use of coal the ash would much depreciate the quality of the lime for most purposesin the ai ts. p

Upon each side of the cupt 1a I provide peep-holes L L', through which the operator can inspect the interior of the cupola when in use. Those shown at L are divided into two branches toward the interior of the stack, as shown in Fig. 3. These peep-holes L are also used to shake down the liniestone, after the lime has been drawn, by means of an iron bar introduced into them, and when not thus used they are closed with a square piece of firebri'ck'.

This kiln can be drawn once in from three to-sixV hours, according to the quality or kind of stone used, producing about three hundred bush'els of lilne every twentyifour hours, with about two and a half cords of Wood, accord ing to the size of the kiln and the kind of stone used.

When the linie is to be drawn, the car F is placed as seen in Fig'. 2, and the drop-slide depressed to the inclined Wall c. A little agitation with an iron rod will cause the lime t) descend into the car, and when this is full the drop-slide can be replaced and the car withdrawn. The whole operation will not consume more than two crthree minutes, and scarce any abatement of heat is produced.

The partially-burnt stone is then shaken down by introducing a bar into the peep-hole, and the cupola replenished from the top by the introduction of raw stone.

In other forms of kilns the drawing is done with shovels, and it requires from one to two hours to draw the lime, and then it requires about two more hours to restore the heat to ,its proper standard, thereby saving by my improvement, both in time and fuel, about twenty-five per cent.,for it is necessary to draw four times in every twentyfour hours.

What I claim as my improvement, and desire to secure by Letters Patent, is-

1. The herein-described fire-chambers G G, with spiral flues, which are so arranged upon each side of the cupola that the fiame is caused to penetrate every part of the interior in a i spiral curve, as and for the purpose specified;

2. The drop-slide E, for discharging the burnt limestone, and keeping the cupola;`

tightly closed when not being discharged,the same being constructe-d, arranged, and operating as and for the purpos'e specificd.l

3. The car F, in combination with the drop'- slide and kiln, arranged and Operating as stt forth.

O. D. PAGE.

Witnesses:

W. H. BURRIDGE, I. HoLMEs.