US104655A - Improvement in kilns for calcining ores, limestone - Google Patents

Description

UNITED STATES PATENT GEEICE.

oHAELEswILLIAM SIEMENS, or WEsTMINsTEE, ENGLAND.

.IMPROVEMENT `IN KILNS FOR CALCINING ORES, LIMESTQNE, 86C.

' Specification forming part of Letters Patent No. 104,655, dated June2l, 1870.

To uf/ZZ whom it may concern,.-

Beit known that I, CHARLES WILLIAM SIE- MENS, of Westminster, of the county of MiddleseX, England, have invented" an4 Improves ment in Kilns for Calcining Ores, Limestone,

or other Matters; and I dohereby declare the same to be fully described in the following specification and represented in the accompanying drawings, of Which- Figure l denotes a vertical section of it, such section being taken on the line X X of Fig. 3.

lFig. 2 is a sectional plan on lines Y Y and y y of Fig. 1. Fig. 3 is a sectional plan on lines The kiln I employ for calcining the spathic ore or lime to be used is not dissimilar in general form and arrangement from an ordinary limekiln; but the material to be calcined is charged at the top without the admixture of solid fuel. Gaseous fuel is to be admitted at the circumference of the kiln at some elevation from the base, and also in the center of i the kiln, through an ascending channel and under a covering hood. Atmospheric air enters among the calcined and heated mass through the discharge-openings at the bottom of the kiln, and, after having become heated itself, meets With thedivided currents of gaseous fuel, with' which it enters into complete combustion, producing intenseheat. Theproducts of combustion, together with the liberf ated carbonic acid and aqueous vapor, rising through the superincumbent mass of materials, heat the same, preparatory to its being acted upon by the calcining-heat, and escape at the top comparatively cool from the freshlycharged materials. u

Oneadvantage of this calcining-kiln is that the products of combustion escape from it in L the form of carbonio acid instead of carbonio oxide, with their admiXture of nitrogen, resulting ina great saving of fuel. Another advantage consists in the absence of ashes of the combustible matter employed, and another in the regular` and intensified action which can be obtained in regulating the supply of gas to the continuous action of the kiln. A gallery or galleries are erected on the outside of the kiln, and stoppered apertures are provided through its side walls for the purpose of introducing tools for prizing the material incase it should hold together and not descend freely. The current of air vand gas through the calcining mass may be accelerated by placing a hood or chimney upon the kiln, and by introducing a steam-j et into the same. Kilns of this description may be used generally with advantage in calcining ores and for' burning lime, cement, and plaster-of-paris.

The. kiln A is provided 'with aiming of V fire brick, as shown, and at itsbase a conical projection, B, through the center of which is formed the passage C for combustible gas,` which is "to be supposed to be supplied from one or more gas-generators, and to pass through the flue D and issue into the kiln from beneath an riron hood, E, arranged over the con'e B. At the same time combustible gasl is also to be caused to pass from the flue D through a circharge-apertures K at bottom will, in rising.

up through the heated calcined masses, take up heat therefrom, and, in coming into contact with the combustible gas issuing from the hood-Irland through the opening H, will enter into combustion with the gas, so as to effect a considerable and equable'heating of the entire charge without any admixture of solid fuel being requisite. `The supply of gas through the apertures H at the circumference may be regulated by means of a damper, L, in t e conv duit G.' The hot gaseous products of combustion, in passing up through the kiln, impart their heat to the charge in the upper part-before escaping from the top.

rIo prevent the clogging of the charge of the kiln stoppered apertures M M N Nare formed around the kiln, so as to be accessible from a gallery, 0, arranged as'shown in Fig.'3.

Through these apertures tools may be introduced for prizing the charge and causing it to descend freely. Access may be had to the passages G from the gallery O, (through apertures P, provided with'covers,) for the purpose of clearing them out when necessary. Other apertures, R, provided with doors, may also be formed at the bottom of these gas-passages,

they being accessible from a pit, S. The disi charge-openings K should be provided with doors Q, to regulate the draft of air and the discharge of the eoloined materials.

I claim- The arrangement and combination of the cone B, its hood E, and the system of air and gas ues C D F G, with the kiln, constructed substantially as specified, the Whole being to operate as and for the purpose as explained.

Vitnesses: C. WM. SIEMENS.

Rona?. LINKsoN, EDWD. N. HoBBs,

Both 0j' 2 Popes Head Alley,

Oorfnhz'll, London, Gents.

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