US2482709A - Device for preventing cinder eruptions from blast furnaces - Google Patents

Description

Sept. 20, 1949. H. G. HARD DEVICE FOR PREVENTING CINDER ERUPTIONS FROM BLAST FURNACES Filed March 50, 1948 FIG- lhveniam 19 595597 6, H495) Patented Sept. 20, 1949 DEVICE FOR PREVENTING CINDER EBUP- TIONS FROM BLAST FURNACES Wanna,

Birmingham Tennessee Coal, Iron and Company, a corporation of Alabama Application March 30, 1948, Serial No. 17,997

1 This invention relates to metallurgical blast furnaces and particularly to improved means for preventing cinder eruptions from blast furnace hearths.

In the usual blast furnace with which I am familar, the refractory brickwork of the hearth is surrounded by an outer jacket of heavy steel plates and a water cooled jacket within the outer jacket. The upper edge of the water cooled jacket has an outwardly directed ledge which rests on the upper edge of the outer jacket and receives the cooling water connections. The tuyre jacket is supported on this ledge. The fit between the ledge and the tuyere jacket is often imperfect. Thus there is a plane of weakness through the furnace wall through which molten cinder can erupt and cause severe damage.

An object of the present invention is to provide an improved and simple device for preventing cinder eruptions between the tuyre jacket and the water cooled hearth jacket.

A further object of the invention is to provide a means which solidifies any cinder that reaches the plane of contact between the tuyre jacket and the water cooled hearth jacket and thus utilizes such material to effect a complete seal of the plane of weakness.

In accomplishing these and other objects of the invention, I have provided improved details of structure preferred forms of which are shown in the accompanying drawings in which:

Figure 1 is a vertical sectional view of a blast furnace equipped with an improved device embodying features of the present invention;

Figure 2 is an enlarged vertical sectional view of the device shown in Figure 1; and

The contact between ledge l6 and tuyre jacket I8 is likely to be imperfect since the contacting surfaces are not machined but remain somewhat irregular. With usual constructions gases and cinder sometimes escape through brickwork l5 and may then erupt through the imperfect contact and cause severe damage to the furnace. To prevent such occurrences in accordance with the present invention, a continuous annular flange depends from the underface 0f tuyere jacket l8. Said flange is spaced inwardly from the edge of the tuyre jacket and fits between the outside of the brickwork and the inside of the water cooled hearth jacket closely within the latter. Any

molten cinder that tends to escape from the hearth through the brickwork impinges on the inner face of flange 2. and must flow around be neath said flange. Such cinder is thus brought into contact with water cooled jacket it below 20 the contact with the tuycre jacket. The water cooled jacket solidifies the cinder which thus furnishes a seal against further cinder eruptions from the hearth.

In the construction shown in Figure 2 the 25.flange is welded to the underface of the tuyere jacket. In the modified construction shown in Figure 3, the flange, designated 2|, is integral with the underface of the tuyere jacket, the con- Figures 3, 4 and 5 are enlarged vertical secmay be of any usual construction. The furnace hearth is designated l2 and comprises an outer jacket l3, 9. water cooled jacket l4 and brickwork i5, all of circular outline in plan. As best shown in Figure 2, the upper edge of the water cooled hearth jacket has a ledge it through which cooling water enters the jacket via connections l'l. Ledge it rests on the upper edge of outer jacket I3 and supports the tuyere jacket It. The latter jacket has a somewhat smaller outside diameter than the hearth jackets and its edge is spaced inwardly from the edge of ledge l6.

Tuyere jacket ll carries cooling plates IQ.

struction otherwise being the same as that shown in Figure 2. In the modified construction shown in Figure 4, the flange, designated 22, is integral as in Figure 3 construction, but also contains a cooling water duct 23 connected with the cooling water connection to the water cooled jacket.

In Figure 5 I have shown a modified construc. tion in which the tuyre jacket extends outwardly of the hearth jackets. In this construction the flange, designated 24, is secured to the inner face of the tuyere jacket and comprises a ring of right, angle cross section. The vertical leg of the flange fits closely within the water cooled jacket as before. It is seen that the operation of this construction is similar to that of Figures 1 and 2.

While I have shown and described only certain illustrative embodiments of the present invention, it is apparent that further modifications may rise. Therefore, I do not wish to be limited by the disclosure but only by the scope of the appended claims.

I claim:

1. In a blast furnace wherein the tuyre jacket is supported on the water cooled jacket that surrounds the hearth, a device for preventing cinder eruptions through the plane of contact between the jackets comprising an annular flange dev3 pending from the tuyere jacket and fitting within the water cooled jacket.

2. In a blast furnace having an outer jacket and a water cooled jacket surrounding the brickwork of the hearth, an outwardly extending ledge on the upper edge of said water cooled jacket resting on the upper edge of said outer jacket, and a tuyere jacket resting on said ledge, a device for preventing cinder eruptions through the plane of contact between the jackets comprising an annular flange depending from the underface of said tuyre jacket and fitting closely within said water cooled jacket.

3. In a blast furnace having an outer jacket and a water cooled jacket surrounding the brickwork of the hearth, an outwardly extending ledge on the upper edge of saidwater cooled jacket resting on the upper edge of said outer jacket, and a tuyere jacket resting onsaid ledge, the contact between said ledge and said tuyre jacket being imperfect, a device for preventing cinder eruptions through the imperfect contact comprising an annular metal flange depending from the underface of said tuyre jacket and fitting closely within said water cooled jacket, said flange forming a baiiie to deflect cinder that escapes through the brickwork into contact with said water cooled jacket.

4. In a blast furnace having an outer jacket and a water cooled jacket surrounding the brickwork of the hearth, an outwardly extending ledge on the upper edge of said water cooled jacket resting on the upper edge of said outer jacket and receiving the cooling water connections to said water cooled jacket, and a tuyre jacket resting on said ledge, the contact between said ledge and said tuyre jacket being imperfect, a device for preventing cinder eruptions through the imperfeet contact comprising an annular flange depending from the underface of said tuyre jacket inwardly of the outer edge and fitting between the outside of the brickwork and the inside of said water cooled jacket closely within the latter, said flange forming a baiiile to deflect cinder that escapes through the brikwork into contact with said water cooled jacket beneath the imperfect contact with the .tuyere jacket.

5. In a blast furnace having an outer jacket and a water cooled jacket surrounding the brickwork of the hearth, an outwardly extending ledge on the upper edge of said water cooled jacket resting on the upper edge of said outer jacket and receiving the cooling water connections to said water cooled jacket, and a tuyre jacket resting on said ledge, the contact between said ledge and said tuyere jacket being imperfect, a device for preventing cinder eruptions through the imperfect contact comprising an annular flange depending from the underface of said tuyere jacket inwardly of the outer edge and fitting between the outside of the brickwork and the inside of said water cooled jacket, said flange containing a duct for circulation of cooling water connected with the cooling water connections to said water cooled jacket.

HERBERT G. HARD.

REFERENCES CITED The following references are of record in the file Of this patent:

UNITED STATES PATENIS Number Name Date 614,381 Gaines "Nov. 15, 1898 OTHER REFERENCES Ser. No. 297,370, Bartscherer (A. P. C.), published May 25, 1943.

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