Патент USA US2405461код для вставки
Patented Àug. 6, 1946 ,05,461 UNrLrEo stars `rsnf 2,405,461 Y BLAST FURNACE 'rUYÈaE John H. Sprow, Jackson, Ohio I Application August 22, 1945, Serial No. 612,015l 5 Claims. (C1. 26e-41) ' 1 My invention relates to blast furnace tuyères. " It has to do, more particularly, with va tuyère for inserting a combination concentrated stream of air, as well as a stream of air which has a 2 which will permit furnishing of a certain quantity of air but in varied velocities to the» material in the furnace. ' Another object of my invention is to provide spreading effect, into a blast furnace. a tuyère which has two dimensions'in cross In the past, many attemptsY have been made sectional diameter which provides for a penetrat to provide a blast furnace with a tuyère `having ing blast and a spreading blast wln‘le at the same a blast of air which will penetrate to the’center time maintaining the same total quantity of air of the furnace and, at the same time, will permit inserted in the furnace. the spreading of air around the sides of the 10 Another object of my invention is to provide a furnace in order to aid in the reduction of the tuyère having its inner side wall surface divided ore and fuel at that point as well as at the center. into four sectional units, two of said units being In other words, a tuyère which furnishes a pene spaced closer together than 4the other two units trating blast of air that does not have a, spread yet forming no obstruction to the blast of air ing iiow. To overcome this difficulty, it has been 15 inserted from the blast main. .. necessary to make and position tuyères of two Another object of> my invention is to provide a sizes in the furnace in order to accomplish this tuyère which will more eiiiciently reduce thema uniform reduction ` of materials placed in the terial in the furnace by a uniform distribution blast furnace. The main diñiculty in using two of air blast to the center of `the furnace as well sizes of tuyères is that it cuts down the overall as around the sides thereof. blast into the furnace and thus reduces the Another object of my invention is to provide a eii‘iciency of the furnace. Various devices have tuyère which will have a penetrating blast action been inserted in tuyères for varying cross-sec and at the same time substantially reduce the tional size, but they> have quite generally re formation of ypilasters around the sides of the sulted in the formation of back pressure and 25 bosh portion of the furnace.v ç ineñ‘icient blasting. At the present time, narrow Another object of my invention is to provide a tuyères are placed along vside of wide-nosed tuyèere having at least two diameters in cross tuyères in thel bosh of the blast furnace. The section which will facilitate a reduction of the narrow tuyères give the penetrating blast while ore uniformly throughout the furnace. the wide-nosed tuyères give a fan-like spreading 30 Various other objects and4 advantages will be action for aiding in the reduction o-f the mate apparent from the following detailed description ral at> thesides of the furnace. Even with the and the drawing where-in similar characters of great number of tuyères now positioned in the reference designate corresponding parts and furnace, there is still an uneven distribution, and wherein where the narrow tuyères appear inthe furnace, 35 Figure 1 is a front end View of the tuyère, con pilasters or slag deposits form around the sides structed according to my invention, taken along of the furnace adjacent> the narrow-nosed tuyère. line l-l of Figure 2. This formation of the pilasters greatly'reduces Figure 2 is a vertical sectional view of the the life of the individual tuyère, therefore, neces tuyère taken along line 2~--2 of Figure l. sitating replacements sooner than ordinarily ex 40 Figure 3 is a rear end View of the tuyère taken pected. Furthermore, as indicated above, the " along line 3-3 of Figure 2 and showing the use ofthe narrow or small-nosed tuyère reduces plugged opening for water cooling the tuyère. the amount of air forced into the furnace and Figure ‘l is a fragmentary perspective View of this reduction is noticeable in the resulting prod the ` tuyère, partly in section, illustrating the uct. All blast furnaces have certain capacities, 415 marked taper of one of the sections of the inside and if any element, either fuel, ore or air, is " surface. varied, it vitally aiiects the operation of the fur Figure 5 is a side elevational View of the lower nace. To overcome the above difficulties, appli end of the blast furnace showing the location »cant has devised a tuyère having -the following of the tuyères with reference/to `the bosh and advantages over present-day tuyères. 50 One of the objects of my invention is to provide ' Figure 6 is a top -plan View of the tuyères in a tuyère which is capable of furnishing both a Iplace in theblast furnace taken along line ’SQ-6 penetrating and spreading blast in a furnace. ~ of Figure 5'and showing thetwoff'old distribution » Another object of my invention is to provide a of the air blast. hearth. .tuyère of varying cross ‘sectionl'at -thelnose end u55 . Aî ' '~ ` Referring to theV drawing, more- particularly to 3 4 Figure 2, I illustrate a hollow tuyère I of frustro conical shape. The tuyère I is tapered toward , . , _. furnace. For example, if the particular furnace require the nose end 2. ments call for a more penetrating blast, the tapered segment 6 can be made 4-inches in diam The tuyère I is provided with a conventional water jacket 3 for keeping the inner wall sur faces cool and said water jacket is supplied with a steady stream of water through a plurality of orifices 4 shown at the rear end thereof of the tuyère in Figure 3. _ duce the proper blast of air required within the eter, and the wider portion 5, 6-inches in diam eter. It will be seen that this area will be of the same ratio as that of a 5-inch tuyère and still re tain the velocities and penetration characteris tics of the tuyère. While I show in Figure 1 the vertical diameter the widest, it is understood that the tapered diam A -The inner wall surface of the tuyère is so formed as to provide four longitudinally extends ing wall segments each of which varies in width throughout; its length. These segmentsjconsti tute the diametrically opposed pair „of Walls 5 and the diametrically opposed pair of walls 6 which pairs are located at rightH-anglestdeach eter 6 can be positioned along the vertical axis and have the Widest diameter portion of the tuy'ère'nose 'along the horizontal axis. This type of. tuyère may be rotated to different positions at intervals so 4that pilasters which form adjacent the narrow-nosed portion 6 of the tuyère can be burnt off by positioning the wide-nosed portion other. Along the longitudinal edges of the walls ‘à there are provided the shoulders 6a that taper rearwardly from the nose 2 to a point where they 'converge with the walls 5, as athâa.A Thus, 20 5 of the tuyère and turning the narrow-nosed portion tò’the .position where the widèëñòsëd 'p'ör as shown in Figure l, the walls 6 :converge towards tion had been. Furthermore, Ywhile I 'show ‘the tuyère nose as being divided 'into quarter ség each other at the nose resulting in a reduction of the diameter of the nose at this area. ‘Conse quently, there results a tuyère which has a- narrow me'nts, it is understood that I also wish 'to ‘use a tuyère wherein a plurality of varying diameters nose portion and 'a wide nose portion ¿at~ right angles to eachother. The diameter of ¿the rear end'of 'the tuyère, however, is uniform. This wall arrangement in a single tuyère produces'a 'com bination tuyère blast which will have -both ’a -pen etrating and a spreading action which must usu aregpresent at the'nose'end and not necessarily limited to two, as shown'in the c’l'ravvin'g.` Itis understood that the tuyère can be divided‘into a v‘number of other segments which may have characteristics similar to- the present type of tuyère shown inthe aèco'mpanyiñg drawing. 'Aït ally be accomplished by having vboth'a wide-nose and a narrow-nose tuyère. , is ßimportant. that the degree of Ataper Yof the smaller diameter Vsegment atthe 'nose endbef-_vei'y . In other words, the tuyère lI illustrate in the figures of the drawing will permit a blast of air - slight along -the Wall of 4the -tuyère «so that `it comesuto a fine point at the -back ‘end of the tuyère. If the taperNi's too marked, back Apressureswill be created in the tuyère which are definitely unde siderable. It is myrintention, therefore, _that -the tapered >segments coincide with ¿the Acircular 'sur face ofthe sider Wall 5 at the .point "5a, at >the into the furnace of the type shown vin Figure 6 which has 'a concentratedstream to the center and also a spreading stream which allovvs‘a uni form distribution 4of the charge ‘of vair‘over Vthe entire interior area of the furnace. AS will bev seen `from Figure 2, ‘the tapered wall segment 6 rear end of the tuyère. _»At‘th'e nose endof the tuyereLI disclose a thickened portion shown best varies in kcross-sectional diameters‘ofV the tuyère and the air passing through v‘the tuyère will be concentrated by the narrower "diameter along invFigure ‘l >by Athe numeral 6. ì _ _A nI/_t will AIce apparent _from lthe-above description thai-,_1 have provided a tuyère having many ad vantages over >present-day tuyëres in use in blast furnaces. AThis tuyère has the equivalent-flow o_fV air _as -both a Ywide or narrow-nosed tuyère the horizontal axis dueto 'theïn’ar’row‘nosed por- ¿ -tioned formed by the tapered`wall segment `(â and the air ‘passing alongthe regulartapered wallipor tion 5 will Aproduce va spreading action. I thus provide a tuyère which is in'eifeot‘equiva‘lent of and >also’retains the proper amount ofair blast two tuyères of varying sizes. YI have found that vtapering the two 'equal Vseg 50 required for the type furnace >in use. ÀThe varia tion _of the cross-sectionalearea ofmywtuyereperf ments of the wall portion of a tuye'rein this manner does not form -back pressures upon the blast main 3 shown in Figure 5. Pipes 1 "are connected to the rear ends of the tuyeres 1 vand to »_'î the blast main 8 which is suspended yabout the 55 furnace by means of the hangers '9. » In Figure 5 of the drawing, I show the loca tion of the tuyeres I at the bottom of the bosh of the furnace just‘above vthe hearth. I also pro vide openings I0 and II which are ofthe `lcon ventional type taps for flowing the slag andthe molten metal out of the furnace 'at intervals. ' larly adaptable to preventthe Vformation of rpilas ters around the nose ofthe tuyère andfalsof-mai-nf eo of the furnace. »Anotheradvantageof my tuyère is that it »is simple in construction y-and does-not form back pressure as >do -other tuyères having Vre stricted nose end openings., Many other 4advan tages will be-apparent from »theabove description, Figure '6 illustrates the spread of air as ‘well as ` the spreading blast. o_re_ in a more efficient manner. ¿It‘willïbe seen that this tuyère is so designed -thatfitïis »particu tain a concentrated blast vof --airdnto the center the concentrated blast which reaches tothe-center i « of the furnace._ The tapered wall segments ‘E fof the tuyère furnish the means for 'the ’concen trated blast while 'the 'wall segments 5 furnish mits both a penetrating and «aspreadingblast of air'into a furnace thus aiding the reduction of »the the drawing and the following claims. y Having thus 'described my invention, what I claim is:_ . ' , - l. iA» -blast furnace tuyère »of -frustroeconical shape îhaving «a circular' 'rear end` portion "andqa nose end portion having -oppositely spaced r`cir 70 cular arcs formed >by taperingY parts rof’the »wall With this arrangement, I am able to vary fthe ' blast in velocity and still maintain’th'e same'cross sectional area of tlie‘tuyère by making the diam eteriof the 'wallrportions indicatediby'the seg ments 5, one-half inch larger than `the‘usual intermediate ‘the vrear e'n'dfandA the'fnose en'di‘thus formingthe saidcoricentriciarcs ófvaryiiig widths so fas `to4 vary' the 'velocity 'and ldirection "of -the rtuyère 'size 4and -by >reducing the' àdiameter `of ‘the " f Fair inserted "in ‘the ’rear end 'of‘ 'the ltuyère' 'to ' be wall 6, one-half inch. This enables me to pro 75 forced into the blast furnace. 2,405,461 5 2. A tuyère of the type described comprising a tapered wall portion, a second wall portion ta pered to a greater degree than Said first-men tuyère presents two diameters for inserting air in varying velocities and directions. 4. A tuyère of the type described having a cir tioned wall portion, saidrwall portions forming cular rear end portion and a nose portion includ segments of a circle which vary the diameter of ing concentric arc segments of varying diameters, the nose end of the tuyère, said segments hav the inner wall of said tuyère including wall seg ing similar segments oppositely disposed and ta ments arranged in pairs of oppositely disposed pered in the same degrees, respectively, as said walls, the walls of some of said pairs converging first two-mentioned segments so that the diam towards each other and towards the tuyère axis to eter of the tuyère at the nose end presents two agreater extent than other of said pairs. diameters for inserting air in varying velocities 5. A tuyère of the type described having a nose and directions. portion including sections which are relatively 3. A tuyère of the type described comprising a angularly disposed and are of varying widths so tapered wall portion, an additional wall portion as to direct the tuyère blast differently, the inner tapered to a greaterdegree than said first-men 15 wall of said tuyère including wall sections ar tioned wall portion, said wall portions forming ranged in pairs of oppositely disposed Walls, the segments of a circle which vary the diameter of walls of some of said pairs converging towards the nose end of the tuyère, said segments having >each other and towards the longitudinal center similar segments oppositely disposed and tapered line of the tuyère to a greater extent than other in the same degree, respectively, as said ñrst 20 of said pairs. mentioned segments so that the nose end of the . JOHN H. SPROW.