US567414A

US567414A - Blast-furnace offtake

Info

Publication number: US567414A
Authority: US
Publication date: 1896-09-08
Anticipated expiration: 1913-09-08

Description

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Patented Sept. 8,1896.

(No Model.)

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W. R'OTTHOFF & M. A. NEELAND. BLAST FURNACE OPP-TAKE.

No. 567,414. Patnted Sept. 8, 1.896.

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UNITED STATES PATENT ()FFICE WILLIAM ROTTHOFF'AND MARVIN A. NEELAND, OF DUQUESNE,

PENNSYLVANIA.

BLAST-FURNACE O'FFTAK'E.

SPECIFICATION forming part of Letters Patent No. 567,414, dated September 8, 1896. Application filed February 25, 1896. I 8011511110. 580,673. (No model.)

To all whom it may concern:

Be it known that we, WILLIAM ROTT'HOFF and MARVIN A. NEELAND, of Duquesne, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Blast-Furnace Offtakes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a vertical section upon the line 1 1 of Fig. 2, showing the upper portion of a blast-furnace provided with our improvement; and Fig. 2 is a top plan view of the same.

Our invention relates to that class of blastfurnaces which are designed to prevent the carrying out with the outgoing current of gases from the top of the furnace of finelydivided ore-dust from the charge. In the use of the so-called Mesaba ores,which are in a finely-divided condition, great difficulty has been found by reason of the ore being carried off with the escaping gas into the fiues and passages through which the gas travels and into the combustion-chambers of the hot-blast This action results not only in loss of ore, but in filling up the flues and passages, thus decreasing their efficiency and necessitating frequent cleaning. To do away with this difliculty, it has been proposed to use an annular pipe surrounding the furnace I and having a series of gas-outlets leading thereto, the down-comer'being connected to this pipe; and our invention consists in certain features of the annular pipe, as hereinafter more fully described, and set forth in the claims.

In the drawings, 2 represents the upper portion of the blast-furnace wall, this wall having an annular series of inclined outlets 3 therein for the outgoing gases, from which outlets extend branch pipes 4, which lead to an inclined annular pipe 5, which surrounds the upper part of the furnace. These branch pipes are preferably provided with explosion-doors 6 and lead downwardly to the bustle-pipe below them, the down-comer 7 connecting with the annular pipe at its lowermost point.

8 is the bleeder for the surplus gases.

As shown in Fig. 2,,the annular pipe 5 is not continuous, but on the side of the furnace opposite to that at which the downcomer is attached it is cut in two and the separated ends provided with suitable closures 9 9. It will be noticed that each por-. tion of the bifurcated annular pipe is gradually increased in cross-sectional area from the closed end portion to the lowest point therein, so as to provide for the increased amount of dust and volume of gases therein. The outlets 3 in the furnace-wall are inclined inwardly, so that dust lodging therein may slide back into the furnace, and theannular pipe 5 is also inclined, so as to allow the dust settling therein to slide down into the downcomer, whence it passes to the dust-catcher.

The advantages of our invention will be apparent to those skilled in the art, since the liability to loss of ore-dust and clogging up of the passages is greatly lessened. The gasoutlets may be spaced as desired and any desirable number may be employed,and many other variations may be made without departing from our invention, since We claim 1. A blast-furnace, having an inclined annular pipe about its upper portion, a downcomer connected to said pipe, and an. annular series of gas-outlets provided with branch pipes leading to said annular pipe; substantially as described. 7

2. A blast-furnace having in its upper portion an annular series of gas-outlets and an inclined annular pipe to which they are connected, said pipe being connected on one side to the down-comer and having a gradually increasing-cross-sectional area from the opposite side of the furnace toward the down comer; substantially as described.

In testimony whereof we have hereunto set our hands. s

WILLIAM ROTTHOFF.

MARVIN A. NEELAND.

\Vitnesses:

G. I. HoLnsnIP, H. M. OoRwIN.