US1575060A - Open-hearth furnace - Google Patents

Description

March 2 1926.

J; D. JONES ET AL OPEN HEARTH FURNACE 4 Sheets-Sheet 1 Filed April 23 1921 March 2,1926. 1,575,060 J. D JONES ET AL OPEN HEARTH FURNACE Filed April 23, 1921 4 sheets-Sheet 2 March 2 1926.

- J. D. JON-ES ET AL OPEN HEARTH FURNACE Filed April 23, 1921 4 Sheets-Sheet :3

March 2 1926.

1,575,060 J. D. JONES ET AL 4 OPEN HEARTH FURNACE Filed April 1921 4 Sheets-Sheet 4 v r I r Patented Mar. 2, 1926.

UNITED STATES PATENT OFFICE.

JAMES DYER JONES, OF SAUL'I. STE. MARIE, ONTARIO, CANADA, AND EARL EWING LITZ, OF SAULT STE. MARIE, MICHIGAN.

OPEN-HEARTH FURNACE.

Application filed April 23, 1921. Serial No. 463,856.

To all whom it may concern: Be it known that We, JAMES DYER JONES,

' a citizen of the United States, and residing at the city of Sault Ste. Marie, in the Province of Ontario and Dominion of Canada, and EARL EWING LITZ, a citizen of the United States, and residing at the city of Sault Ste. Marie, in the State of Michigan, United States of America, have invented certain new and useful Improvements in OpenHearth Furnaces, of which the following is a specification.

This invention relates to improvements in open-hearth furnaces for the manufacture of steel, and other metallic products, and the objects of the invention are to effect a greater economy in the operation of the furnace, to utilize the heat of the waste gases in heating the i'ngoing air, and also the fuel, if necessary, without losing any time in reversing as is the case in present known furnaces, to lessen the expense of repair, to eliminate delays in operation, to obtain a maximum amount of output from the furnace, and to enable the various operations to be performed continuously; and it consists essentially of the feature of having separate ports used respectively for the supply of the combustible combination of fuel and air exclusively and the escape of the waste gases exclusively, and of the other features hereinafter described in detail in the accompanying specification and drawings.

In the drawings:

Figure 1 is an elevation of an open-hearth furnace embodying a suggested construction for putting into effect the present invention.

Figure 2 is a vertical sectional view through the same.

Figure 3, is a sectional plan view on the line ww, Figure 1.

Figure 4.- is a fragmentary sectional view, showing the conducting throat or flue moved to one side to permit charging of the furnace.

Figure 5 is a sectional view on the line, y z Figure f.

Figure 6 is a sectional view taken at right angles to Figure 2 and showing one of the heating burners.

In the drawings like characters of reference indicate corresponding parts in all the figures.

Referring to the drawings:

A indicates the furnace proper, having therein the hearth or crucible B constructed of suitable refractory material in accordance with the practice in the art. The furnace is provided with a suitable taphole 10 leading to a spout 11 which may discharge into the bucket C supported by a travelling crane, or other similar device, and with a slag tap hole 10.

The furnace is provided at suitable points around its periphery with fuel and air ports 12, each having a burner D therein adapted to combine for burning suitable fuel such as gas, powdered coal, oil, or the like, with pre-heated air, both under pressure preferably but not necessarily, such as to maintain a higher pressure inside the furnace than the outside atmospheric pressure. The construction of the burners of this type does not form part of the present invention nor does the combination, within the burners, of the fuel and the air form part of the present invention. The burners are supplied with heated air from a conduit 13 leading from a manifold 14; which extends around the regenerative stove E and is operatively con nected thereto in the manner hereinafter described.

The regenerative stove in this particular construction is locatedimmediately above the furnace A but may be conveniently located elsewhere, but in such away that the products of combustion may pass through the stove from the furnace, said products passing in this particular construction from the furnace to the stove through a throat or fine F which is made removable in order to permit charging of the furnace. it will be seen that the throat F is frustro-conical in shape and when in normal position (as in Figure 2) is located immediately above the opening 15 in the roof 16 of the furnace.

The stove E is supported by suitable standards 17 leading from the frame-work 18 extending around the furnace A. The stove E may be of any convenient or wellknown design and may be of the design which we have illustrated. The gases arising from the throat F are designed to pass into the bottom of the stove and to pass through suitable passageways 19 to the chimney G. The passageways 19 are formed in conduits 20 in the stove, which conduits extend through the heating chamber 21 of the stove. The air is caused to take a circuitous path through the heating chamber 21 by means of staggered baflie plates 22, the inlet 23 for the air being located at the upper end wall, the outlet port 24 is at the lower end and is connected to a manifold 14.

The air to be regenerated will pass through the heating chamber 21 and be hea ed by the heat from the conduits 20 before passing into the manifold 14 from whence it passes into the burner D. The movement of the air is effected by suitable blowers or compression apparatuses not forming part of the present invention and not illustrated herein. In addition to the openings 12, the furnace is provided with one or more opening 25 having a suitable external door 26 of any convenient design and adapted to permit access to the interior of the furnace for any purpose desired. The fuel may be supplied to the burner D from suitable sup ply pipes 27 through which the fuel may be forced under pressure. 7

In order to permit charging of the furnace, the throat is mounted on rollers 28 which run on tracks 29 and is adapted to be moved inwardly and outwardly by suitable mechanical means, such as fluid pressure cylinder 30, having a suitable piston with a piston rod 31 operatively connected to the throat F in a manner well known in the art.

When it is desired to charge the furnace, the throat is retracted to the position shown in full lines in Figure 4 and in dotted lines in Figure 1, and the material to be treated may then be dumped through the opening 15 from suitable charging truck H, or other device.

In operation, if the material to be melted is placed in the furnace, the fuel such as gas, powdered coal, oil, or other suitable substance, is forced under pressure through the burner D, in which burner it is combined with pre-heated air forced under pressure, the pressure being preferably, but not necessarily, such as to maintain a higher pressure inside the furnace than the outside atmospheric pressure.

The chimney Gr carries off the products of combustion, or waste gases, through the stove E, where the greater part of their sensible heat is imparted into the fines 20, which act as regenerators, and which impart the heat, in turn, to the ingoing air, thus pre-heatin the air before combining with the fuel.

Any required observation of the bath is permitted by the doors 26 which also permit the supply of any additional material to the bath, and permit repairing of the furnace between charges.

It will be seen that, owing to the supply ports and discharge ports being exclusive and not interchangeable, and at the same time utilizing the heat of the waste gases to heat the ingoing air the delays consequent on reversing the supply of fuel and air into the furnace is done away with, thereby appreciably shortening the period of time within which maximum heat is reached, and permitting continuous maintenance of maximum heat, resulting in greater relative product and economy in operation.

It will be observed that the fuel and air ports 12 are positioned at intervals around the periphery of the furnace and being operated simultaneously will produce flames projecting from the side towards the centre of the furnace and impinge on the bath, thus effectually maintaining the surface thereof at a high temperature.

As many changes could be made in the above construction, and many apparently widely different embodiments of our invention within the scope of the claims, constructed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawings shall be interpreted as illustrative and not in a limiting sense.

What we claim as our invention is:

1. In an apparatus of the character described, the combination with a furnace, of a regenerative stove and a removable throat of frusto-conical formation adapted to form a connection between the furnace and the regenerative stove, and designed exclusively for waste gases.

2. In an apparatus of the character described, a furnace having a port opening for the products of combustion, a regenerative stove, tracks mounted between the regenerative stove and the furnace, a removable throat exclusively for waste gases on said tracks and adapted to form a connection between the furnace and the regenerative stove, a plurality of separated fuel burners operatively connected to the furnace, and adapted to simultaneously inject fuel with compressed air into the furnace.

3. The combination with an open hearth furnace, containing a plurality of separated ports used simultaneously and exclusively for the admission of fuel or air or fuel and air combined, and an outlet flue used exclusively for the waste gases, of a regenerative stove and a removable throat designed exclusively for waste gases and adapted to form a connection between the furnace and the regenerative stove.

In witness whereof we have hereunto set our hands.

JAMES DYER JONES. EARL EWING LITZ.

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