US1517185A - Blast-furnace tuyere - Google Patents

Description

Nov; 25, 1924.

G BEATO N BLAST FURNACE T'UYERE Filed June 50.41923 JILL-N101? No). 2s-Q1924.

G. BEATON BLAST FURNACE TUYERE 2 Sheeis-Sheei 2 Filed June so, 1923 I .ZMJENTDR EEUREE BEfiTuNr I Patented Nov. 1924.

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PATENT ori ice..."

GEORGE BEATON, F SYDNEY, NOVA SGOTIA, CANADA.

BLAST-FURNACE Application filled June so, 1923. Serial no. 648,736.

To all whom it may concern:

Be it known that I. Gnoncn BEATON, a subject of the King of Great Britain, and resident of Sydney, in the Province of Nova Scotia, Dominion of Canada, have invented certain new and useful Improvements in Blast-Furnace Tuyeres, of which the following is a specification.

' This invention relates toimnrovement's in blast furnace tuyeres, and has for its primary object to provide a tuyere nose carrying a covering of refractory material. I

Further objects are to provide a tuyere nose which is to be provided with a protector of refractory material at the lower side, which is nearest to the hearth of the furnace. Other objects also are to provide a tuyere which will have its nose provided with an annular covering of refractory material designed to replace the old styleof tnyeres, which wereburning on the upper and lower edge of the nozzle.

A further object is the provision of a tuyere for blast furnaces that will not quickly burn up and thus obviate the necessity of having, as'isthe case with tuyeres at present in use, to frequently shut oif the blast for ten or fifteen minutes while a burnt out tuyere is being replaced. It is a known fact that in blast furnaces a great number of tuyeres are burnt up-even in the space of a month under present conditions, and to remedy this frequent replacing of tuyeres is an essential object of my invention.

out per week, so that the invention has a decided effect on the efliciency of the furnace,

the cost of running of which is considerably lowered. v f

Further objects are to provide an improved blast furnace tuyere that is simple in construction, not liable to go out of repair, and generally to adapt the several parts to better perform the functions required of them.

In the drawings Figure 1 is a plan view of the improved tuyere.

Figure 2 is a longitudinal section.

Figure 3 is a longitudinal section through a somewhat modified form of tuyere.

Figure 4 is a bottom plan V ew of the tuyere.

Figure 5 is a bottom plan view of the tuyere shown inFigure 3.

view taken on the line 6-6 of Figure 1. Figure 7 is a plan view of an alternative form of tuyere. A

Figure 8 is a longitudinal section.

Figure 9 is a longitudinal section showing an annular refractory block.

Figure 6 is an enlarged sectional detail Figure 10 is a bottom plan view of the Y tuyere shown in Fi re 8.

Figure 11 is a bottom. plan view of the tuyere shown in Fi re 9.

Like characters 0 reference indicate corresponding parts in all the figures.

Referring more in particular to drawings for a detailed description, A represents the tuyere, which maybe cast of any suitable metal, and is of' the usual construction, comprising the tapering cylindrical body 10 formed with the annular water 'acket 11. A water inlet 12 and a water out et 13 are provided, as shown in Figures 1 and 7.

. Connected to the water inlet 12 is a metallic pipe 14, which is coiled withinv the annular jacket 11, and leads the water to the inner part of the tuyere.

The tuyere nose 15 is cored out as at 16 in order to form an arcuate recess on the side of thetuyere, which is to be lowermost in the furnace, and nearest the hearth. This particular construction is designed to replace the old style of tuyere, which were burning on the lower edge of the nozzle. Only one of the improved tuyeres is burnt In order to protect the ti1yere,-a filling of refractorymaterial 17 is placed within the recess 16, and the refractory material may be securely held within the recess by means of dove-tailed projections'or studs 18 pro vided in the bottom of the recess.

In order toplace this refractory material within the recess, the tuyere nose is cored as already explained in order .to provide the recess 16, and the refractory is rammed within the'recess as hard as possible. The

tuyere is then placed nose down on a smooth plate and left in an ordinary foundry core oven for a period of about forty-eight hours,

more or less. The thin ring of metal left on the outside diameter of the nose will protect the refractory from abuse in shipping and rough handling at the f ace. I

In case a vitrified refractoryis used, it can 'these slots cored in the thin from shrinking by casting narrow slots 1n f the thin ring of metal as shown at 19 in Figures 2m 5 inclusive. In other words, metal around the nose are. designed to prevent the tearing of the casting while shrinking on the hard reborundum cements, etc.

- silicon carbide,

fractory core.

' The refractory may be any material such as carborundum, carbon, refrax, silfrax, carbofrax, silica, dolomite, lime, fireclay, crome, zirconia, magnesia, beuite, quarzite or any used singly or mixed with anotheran bondin'gmaterialwhatsoever such as; tar, pitch, refractory clay and sodium silicate, car- So far the best refractory obtained has been made by a mixture of. ma'gnesiabonded with carborundum cement.

. With reference to the composition of the 'materials above referred to, refrax and silfrax are two products made by a special process of recrystallization and are com-. posed wholly of carborundum, held in solid form by the interlocking and intersgrowthof silicon carbide ferences between these two crystals.

roducts is in the size of the crystalline particles, silfrax being composed of extremely fine carborun dum powder and refrax of coarser articles. v Refrax is composed wholly of carborundum held 'to ether by crystallization and, therefore, 5 as the properties of unaltered by any bonding agent. e

Oarbofrax may be termed the best known type of carborundum refractory and 1s composed of crystals of silicon carbide held together by a small percentage of a bonding refractory material. Three varities of this type are produced and knownas carbofrax has most .carborundum itself.

into more or less intricate for s clal applications.

carbofrax A, carbofrax B and carbofrax C. Carbofrax is made not onl in standard refractory shapes but also mou ded forms as required smal amount of bonding material used, of the properties of Creme analyzes as follows Iron peroxide 17:5 Silica; i 3. 25

follows:

Percent. Silica 4to7 3 :Iron peroxide 3to5 Alumina 90 In order to replace .a tuyere which burns onboth the top and bottom, the cored out bonded with any The chief dif- On account of the.

cess inthe nose,

is a hydrousoxide jacket in the body recess 16 may be in the form shown at 20 orming an annular recess having an inclined bottom 21, so thata heavier thickness of refractory may be placed at the bottom, which is nearest the hearth of the furnace, than at the top, which the tuyere tense..

If desired also, the means of retaining the refractory within the recess instead of comprising studs as shown. in Figures 2 to 5, may consist of dove-tailed transverse ieces or projections 22, which extend ra ially within the recess 20.

It be obvious that this improved tuyere has considerable advantages over the metallic tuyere now used, and that. havingl an average life of twelve weeks as compare to the exceedingly shorter life of. the present tuyere, which is day, it will have a decided effect on the efficiency of the furnace, since the blast not being taken off so often, the temperature will be kept up better than result that the output of the furnace will be greater.

As many-changes could be made in the above construction, and many apparently widely different embodiments of is submitted is not so instructed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompgnying specification and drawings shall interpreted as illustrative, and not in a limiting sense.

What I claim as my invention is:

.1. A blast furnace tuyere com rising a cylindrical body rtion, an em jacket in the b y portion, the body portion being formed with a cored out recess in the nose, and. a filling of refractory material 'in'therec nose. I

2. A blast furnace 'tuyere com rising a lagket in the body portion,

g formed withacored I cess 1n the nose,'and a filling of refractory material intherecessed nose. v

3. A blast furnace cylindrical bodyportion, an 'annu ar water the body portion eing formed with a recessed nose."

burnt at therate of 10 a heretofore, with the my inven-- tion, within the scope of the claims, con-.

where the temperature to I r water cylindrical body portion,an annu ar water out annular retuyere com v =116 acket in'the' body portion, the body portion cored out annular ref x the bottom of the recessi being inclined, and 'a of refractorymaterial in the 120 cylindrical body portion, an aim ar'water Locket in the body rtion, the nose of the 0113 portion being furnace, and a filling of refractory material In the recess. 7 Y

5. A blast furnace tuyere com rising a cylindrical body portion, an an r water ormed with a recess on the side to be nearest the health of the rtion, the body portion 18c nose being formed with an annular recess,

and a filling of refractory material in the recess, the refractory being heavier on the side nearest the hearth ofthe furnace.

6. A blast furnace tuyere com rising a cylindrical body ortion, an annu ar water jacket in the body portion, a spiral ty within the water jacket, conducting t e 7 water to the hotted part of the tuyere, the

'fractory material in t e recessed and subjecting the core to a baking treatment for a predeterminedperiod the weight of the tuyere being utilized to retain the .rammed refractory in a solid body.

8. A blast furnace tuyere comprising a cylindrical body ortion, anannular'water jacket inthe b y portion, the body portion nose being formed with a recess, a filling of refractory material in the recess, the recess walls being slotted, as and for they purpose slpecified.

9 A b ast furnace tuyere coin using a cylindrical body portion, an annu ar water so jwcket in the body portion, the body portion 7 ing formed with a cored out recess in the nose, afilling of refractory material in the recessed nose, and a plurallty of dove-tailed projections cast in the bottom of the recess to. retain the refractory.

10. A blast furnace tuyere com rising a cylindrical body portion, an annu ar water jacket in the body portion, a spirally wound pipe in the jacket, the body portion nose 40 being formed with an annular recess, dovetailedprojections in thebottom of the recess, and a filling of refracto material retained in the recess by the pro ections.

In witness whereof I have hereunto'set 45 my hand in the-presence of two witnesses.

p GEORGE BEMIION. Witnesses:

- Tnos'. H. Ifi'rormrr, Pa'mRMAoAmr.

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