US50769A - Improvement in cupola-furnaces - Google Patents

Description

UNITED STATES PATENT OFFICE.

ANNES A. LINCOLN, OF NORTON, MASSACHUSETTS, ASSIGNOR TO ANNES A. LINCOLN, JR, OF SAME PLACE.

IMPROVEMENT IN CUPOLA-FURNACES.

Specification forming part of Letters Patent No. 50,769, dated October 31, 1865.

To all whom it may concern:

Be it known that I, ANNES A. LrNooLN, of Norton, in the county of Bristol and State of Massachusetts, have made a new and useful invention or improvement having reference to cupola or other furnaces for the heating, refining, and melting of metals or metallic ores; and I do hereby declare the same to be fully described in the following specification, and represented in the accompanying drawings, of which Figure 1 denotes a front elevation, Fig. 2 a top view, Fig. 3 a longitudinal section, and Fig. 4 a horizontal section, of a cupola'furnace used in melting iron.

The furnace to which my invention is applicable may be constructed in any ordinary manner, and be either with or without a grate, as circumstances may require. The common cupola-furnace, such as is represented in the drawings, has no grate, the charge of fuel resting directly on the hearth, or what is usually termed a sand bottom.

The special objects or purposes of my invention are the prevention of the formation of clinkersabove thegrateorsand base, athorough combustion of the gases of the fuel, and, fina ly, the obtention of a refined and purer heat for the melting of the metal.

The nature of my invention consists in a pcculiar arrangement of a steam and air induction apparatus with reference to the bottom or sand base or the grate of a cupola or other furnace for the refining or melting of metals.

I am aware that steam and air have been blown into furnaces for the purpose of facilitating the combustion of the fuel thereof, in which case they have been introduced into the ash-pit, and beneath the grate, and passed up through the latter before coming in contact with the fuel. In no cupola-furnace having a sand base have blasts of commiugled air and steam ever been allowed, to my knowledge, to rushintothefuelspaceabovethebase. Neither am I aware that a steam-induction apparatus has been so combined with the tuyere of a furnace as to mingle jets of steam with the air received into the tuyere.

In the drawings, A denotes the body of a cupola-furnace, of which a is the tap-hole, and

B B the tuyeres. The tuyeres are arranged on opposite sides of the furnace, and somewhat above the base, hearth, or bottom 1) thereof, and each of them opens into the chamber 0 of the furnace, by means of a passage, (1. \Vithin each of the tuyeres, which consists of an elongated box, there is arranged a curved pipe, 6, having its side next to the furnace perforated with numerous jet-holes. This pipe is to be closed at its two extremities, and at its middle it is to communicate with a steam-conduit,f, which enters the tuyere, and serves to support the jet-pipe c therein. The air-blast pipe of the tuyere is shown at g. If, now, we suppose the pipe fto communicate with a steam-generator, and the pipe g to discharge air into the tuyere, the steam will fiow from the openings of the jet-pipe, and, mingling with the air, will be forcibly blown into the furnace or its charge of fuel, and will have the useful efi'ects hereinbefore stated.

I do not claim the coin mingling of steam and air, nor the introduction of the same into the ash-pit of a steam-boiler or a reverberatory furnace, whereby such steam and air before gaining access to the fuel of the furnace would be caused to pass through the grate of such furnace, in which case the bars of the grate would so interrupt the introduction of, or so separate the currents of, steam and air as to cause clinkers to form directly on the bars or over the grate, such clinkers operating more or less to prevent the admission of steam and air into the fuel.

I claim as my improvement for the purposes specified The arrangementof the steam-jet and air or blast apparatus so as to cause the commingled currents of vapor and air to enter the furnace at a point above the grate or fuel-base without first going through it, meaning, specially, to claim a cupola-furnace as made with the tuyeres and steam-j ets combined together and arranged with respect to its hearth or fuel-base substantially as specified.

ANNES A. LINCOLN.

Witnesses:

R. H. EDDY, F. P. HALE, Jr.

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