US3043578A

US3043578A - Assembly for insertion in a blast furnace wall

Info

Publication number: US3043578A
Application number: US841635A
Authority: US
Inventors: Werner C Cohn
Original assignee: United States Steel Corp
Current assignee: United States Steel Corp
Priority date: 1959-09-22
Filing date: 1959-09-22
Publication date: 1962-07-10
Anticipated expiration: 1979-07-10

Description

-w. c. COHN 3,043,578

ASSEMBLY FOR INSERTION IN A BLAST FURNACE WALL July 10, 1962 Filed Sept. 22, 1959 INVENTOR:

WERNER C. COHN ATTORNEY UnitedStates Patent This invention relates to an assembly for insertion in a blast furnace wall and more particularly to tuyeres and monkeys. These members are normally made of copper and are ssbjected to extremely severe operating conditions because of the high temperature in the furnace, abrasions from the moving furnace burden, and splashes of molten pig iron from the burden falling into the furnace bosh. The cinder notch monkey may also fail if molten iron mixed with slag comes in contact with its outside surface, if the slag passing through the orifice or opening in the monkey contains molten iron which contacts the copper casting or if an oxygen lance is required to burn through a plugged notch. Because of these conditions the tuyeres and monkeys have a relatively short life. An assembly suitable for this purpose is shown in the co-pending application of Schultz entitled Assembly for Insertion in a Blast Furnace Wall, Serial No. 841,634, filed September 22, 1959. However, the means of holding certain of the parts together in that assembly has resulted in a plane of weakness under certain conditions. While the life of the tuyere and monkey of the Schultz application is greater than previous tuyeres and monkeys this plane of weakness somewhat shortens its life.

It is therefore an object of my invention to provide a blast furnace tuyere or monkey which has a longer than normal life and which has improved means for holding the parts together.

This and other objects will be more apparent after referring to the following specification and attached draw ings, in which:

FIGURE 1 is a sectional view of a monkey in position in a blast furnace;

FIGURE 2 is a view taken on the line IIII of FIG- URE 1;

FIGURE 3 is an enlarged sectional view of the monkey of FIGURE 1; and

FIGURE 4 is a view taken on the line IVIV of FIGURE 1.

Referring more particularly to the drawings, the reference numeral 2 indicates the Wall at the bottom of a blast furnace. A cinder notch monkey 4 constructed in accordance with my invention is supported by a cinder notch monkey cooler 6, which in turn is supported by a cinder notch cooler 8. While my invention will be described in reference to a cinder notch monkey the same construction is used in a tuyere. However, the shape of the longitudinal opening through the tuyere and the shape of the tuyere nose may vary from that shown. The monkey or tuyere'4 consists of a body member 10, a nose 12, a sleeve 14 and a ring 16. The body member and ring 16 are preferably made of copper or a copper alloy. The term copper as used in the claim is meant to include pure copper or an alloy which is predominantly copper, these materials being those most commonly used in tuyeres. The nose 12 and sleeve 14 are made of a refractory material which must resist fusing or softening at the operating temperature which is about 3000" F., crumbling, cracking, spelling and mechanical abrasion. It should also resist chemical reaction with molten blast furnace iron and slag and should have a low coefiicient of expansion and contraction. Graphite and other forms of carbon have proved suitable for this purpose. Refractory oxides such as alumina, chromite, dolomite, magnesite, silica and zirconia may also be used. High meltflee ing point metals or alloys thereof such as titanium, molybdenum, zirconium, tungsten and vanadium are also suitable. The body member 10 is provided with the usual water cooling chamber 18 having inlet and

outlet

20 and 22. A longitudinal opening 24 is provided in the body member 10. The opening 24 has a minimum diameter at the furnace end and a maximum diameter at the outer end. The body member '10 has a reduced diameter portion 26 at its furnace end which provides a shoulder 28. The nose =12 fits over the reduced diameter portion 26 and bears against the shoulder 28. The furnace end of the nose 12 extends inwardly to the opening 24. The body member 10 has a circumferential groove 30 on its reduced diameter portion 26. The nose 12 has a circumferential groove 32 matching the groove 30 and a generally tangential opening 34 extending from the groove 32 to the outer surface of the nose.

In assembly, the sleeve 14 is inserted into the opening 24 and the nose 12 is placed over the reduced diameter portion 26 with its end abutting the shoulder 28. A wire 36 is threaded through the opening 34 into

thegrooves

30 and 32 so as to lock the nose 12 to the body member 10. Instead of using a formed wire, plastic material may be forced through the opening 34 into the

grooves

30 and 32. The material used must be of suflicient strength and have sufficient heat resistance to hold the parts together at the high temperatures encountered. The ring 16 is then positioned in the opening 24 at the end remote from the furnace. may be done by welding, but is preferably done by providing matching threads 38 and 40 on the body member 10 and ring 16. In case of breakage of the nose 12 or sleeve 14 the monkey or tuyere can be-removed and the part replaced.

While one embodiment of my invention has been shown y and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claim.

I claim:

An assembly for insertion in a blast furnace wall comprising a copper body member having a longitudinal opening therethrough and a water cooling chamber surrounding said opening, said opening having a maximum diameter at its outer end and a smaller diameter at its furnace end, a reduced diameter portion on the furnace end of said body member, a preformed refractory nose fitting over said reduced diameter portion and extending beyond the furnace end of said body member, a preformed refractory sleeve fitting snugly within said longitudinal opening and extending into said nose, said body member having a circumferential groove on said reduced diameter portion, said nose having a circumferential groove matching said groove on said reduced diameter portion and a generally tangential opening fromits groove to its outer surface, a wire in said grooves separate from said-copper body member and said refractory nose, and a copper bearing ring inserted within saidlongitudinal opening at its outer end and bearing against the end of said sleeve, and means fastening said ring to said body member.

References Cited in the file of this patent UNITED STATES PATENTS 176,913 Witherbee May 2, 1876 318,604 Devereux May 26, 1885 1,662,850 Ebner Mar. 20, 1928 1,729,447 McKee Sept. 24, 1929 1,759,114 Holzworth May 20, 1930 2,500,089 Neely Mar. 7, 1950 FOREIGN PATENTS 3,663 Great Britain 1867 3,449 Great Britain 1877 277,400 Germany Aug. 11, 1914