US404807A - Peters - Google Patents

Description

(No Model.) 3 Sheets-Sheet.1. P. H. TREAT.

DUST GATGHER FOR BLAST FURNACES. No. 404,807. Patented June 4, 1889.

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DUST GATGHER FOR BLAST FURNACES.

(No Model.)

No. 404,807. Patented-June 4, 1889.

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(No Model.)

F. H. TREAT. DUST GATGHBR FOR BLAST FURNACES.

. No. 404,807. Patented June 4, 1889.

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UNITED STATES PATENT OFFICE.

FRANCIS H. TREAT, OF JOLIET, ILLINOIS, ASSIGNOR OF TIVO-TI-IIRDS TO HORACE S. SMITH AND CHARLES PETTIGREIV, 30TH OF SAME PLACE.

DUST-CATCH ER FOR B LAST-FU RNACES.

SPECIFICATION forming part of Letters Patent No. 404,807, dated June 4, 1889.

Application filed April 6, 1888. Serial No. 269,809. (No model.)

This invention relates to certain improvements in dust-catchers to be used in connection with a blast-furnace and connected therewith by means of a conductor-flue, which conducts the escaping gas, smoke, and dust from a blast-furnace, the construction and operation of which are fully set forth and explained in the accompanying drawings and the letters of reference thereon, which form a part of this specification, in which Figure 1 is a side elevation of a blast-furnace, of its conductor-flue, and of the dustcatcher at the lower end of said conductorflue, a portion of the furnace and conductorfiue being broken away to show their connection.

elevation of the dust-catcher. line 5 5,

Fig. 2 is a central vertical sectional Fig. 3, above is a seml-cross-sectional view on line 1 of Fig. 2, and below line 5 5 a similar View 011 line 2 of Fig. 2, each looking down. 4, above line 6 6, is a semi-cross-sectional view Fig.

on line 3 of Fig. 2, and below line 6 6 a similarview on line 40f Fig. 2, each looking down; and Figs. 5 and 6 are vertical sectional views of the walls of one of the upper flues surrounding the dust-receptacle, showing in Fig.

5 a cover over said fine, and in Fig. 6 showing an iron shield extending from said cover to guard the entrance to said flue.

The object of this invention is to improve the dust-catcher so as to more thoroughly separate dust and all substances from the gas as it enters the dust-catcher from the blast-furnace, in order to render the gas free for use for fuel or other purposes.

Referring to the drawings, B represents the body of the dust-catcher, and is shown in Fig. 1 connected with an ordinary blast-furnace A through the medium of a conductor-flue D, said flue being commonly called the downcomer.

Preferably the dust-catcher is located on the hearth-level at the side of the blast-furnace and connected therewith by means of a fine D, connected with the upper part of a blast-furnace and extending downward to discharge into the top part of the dust-catcher, as shown in said Fig. 1. In this instance the dust-catcher is circular in form, made of boiler-plates riveted together and V contracted at the top, to be of the same diameter as the conductor-flue leading to the blast-furnace and resting on a proper brick or stone foundation and lined with fire-brick,

as represented in broken section lin esin Figs.

2, 3, and 4, in all parts where exposed to great heat, the full cross-sectional lines representing ordinary brick.

The lower portion 0 of the device is a circular dust-receptacle of less diameter and located centrally within its body B, and is provided with a funnel-shaped bottom, E, sup- 7o ported on the walls II, and having an aperture in its center fitted with a conical-shaped valve V, operated from below to open said aperture for discharging accumulated dust from receptacle O on the floor N of the chamber B, below which chamber, formed within the walls H and G, are passage-ways to said chamber for access to remove the dust discharged by the valve.

Between the walls F of the dust-receptacle G and the walls of body B are arranged a series of vertical flues F, which permit the passage of gas, as shown by the arrows in Fig; 2. These fines are separated by fire-brick partitions WV, supported by proper bridging d. 8 5 Below and comm unioatin g with said fiues and between the outer Walls of body B and the walls 11 are arranged an annular series of vertical fines I, larger in area than the lines F immediately above, portions of which are 0 partly cut off by passage-ways G. These fines are separated by fire-brick partition-walls Z, supported by arches Z.

S is a continuous annular gas-sewer located immediately below the fines I and commu'ni- 5 eating therewith, which sewer is provided with an exit-sewer S, leading to the place where the gas is to be used. The conductingsewer S is provided with a sliding Valve 0, inclin ed so as to lie against and slide on the ways :00

O at the side of said sewer-walls. A frame R R supports in proper boxes a shaft I, having a hand-wheel 7L at one end and a pulley P at its center, over which is passed a chain P, secured at its lower end to valve 0 and to a counterbalance-weight Q at its opposite end. Said valve is elevated and lowered by rotatin g said hand-wheel to regulate the discharge of gas from sewer S.

L is a lever fulcrumed at g and supporting the conical valve V on its inner end, and se cured to a hook-rod J at its outer end, which rod is provided with a turn-buckle for regulating its length, and hooks into the eye J, anchored in the foundatiomwalls to hold said valve closed. Said lever is provided on its outer end with a weight L for counterbalancing the weight of valve V and causes it to automatically close after being relieved of its load of dust.

M are man-holes leading through the floor N in the passage-ways G to the gas-sewer S below. The fioor N represents the ground line, the gas'sewer S being below the groundline.

In operation the enters the dust-catcher at considerable velocity from the flue D, and for an exit seeks the annular flues I around receptacle 0. The dust particles, being heavier than the gas, fall into the receptacle 0 E before reaching said fines, and are thus separated from the gas, which passes on through the fines I to the sewer S where it is ready for use. Heretofore in devices for this purpose it has been usual to provide a single and large exit-flue for the gas, and that generally located at one side. The volume of gas would rush to said single exit and carry with it a large percentage of dust.

The improvement in this device consists in providing it with a continuous row of exits located all around the dust-receptacle between it and the outer walls of the dustcatcher proper for diffusing the gas and diverting it to all sides in less volume, and thus permit the dust particles to drop out of it before being carried to the lines.

The exit-fines F may be covered by a brick or other suitable cover on, resting on the walls separating said Hues, as shown in Fig. 5, which cover may, if desired, be provided with a sloping iron shield y, resting thereon and projecting to cover the fines, as shown in Fig. 6, for the purpose of preventing dust and Cinders from being driven directly in said flues. If desired, one continuous flue, instead of a number of detached fines, may surround the dust-receptacle when for any reason such construction should be deemed to be best without changing the character or operation of the device.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is as follows, to wit:

1. In the cylindrical dust-catcher shown and described, in combination with its outer walls, the inner wall arranged concentrically therein, and the space between said walls divided by cross-partitions forming vertical flues between said walls, the dust-receptacle supported concentrically within said inner wall and having vertical. sides, and a funnelshaped bottom provided with a dischargeopening controlled by a valve, substantially as and for the purpose set forth.

2. In the cylindrical dust-catcher shown and described, in combination with the outer wall, the inner wall arranged concentrically therein and the space between said walls divided by cross-walls forming a series of vertical exit'flues between said walls, the dustrcceptacle supported concentrically within said inner wall and having vertical sides and a funnel-shaped bottom, and the annular cover or shield secured to the inner side of said outer wall and immediately above said flues, substantially as and for the purpose set forth.

3. In the cylindrical dust-catcher shown and described, the combination, with the outer walls, and the dust-receptacle supported concentrically therein, said receptacle having vertical sides and a funnel-shaped bottom, of the vertical lines surrounding said receptacle, said fines being formed of two rows of vertical partitions, the upper row containin g twice as many partitions as the lower, substantially as and for thepurpose set forth.

FRANCIS ll. TREAT.

\Vitnesses:

IIIERBERT IV. FoL'rz, L. A. TREAT.

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