US1652168A

US1652168A - Rotary kiln and cooler

Info

Publication number: US1652168A
Application number: US73662A
Authority: US
Inventors: Johan S Fasting
Original assignee: FLSmidth and Co AS
Current assignee: FLSmidth and Co AS
Priority date: 1925-12-07
Filing date: 1925-12-07
Publication date: 1927-12-13
Anticipated expiration: 1944-12-13

Description

Dec. 13, 1927. 1,652,168

I .1. s. FASTING ROTARY 1mm AND COOLER Filed Dec. '7, 1925 2 Sheets-Sheet 1 IN VE IV T0]? Dec. .13, 1927. 1,652,168

J. S. FASTING ROTARY KILN AND COOLER Filed Dec. 7, 1925 2 Sheets-Sheet 2 Patented Dec. 13, 1927.

UNITED STATES 1,652,168. PATENT OFFICE.

J'OEAN S. FABTING, OF VALBY, NEAR COPENHAGEN, DENMARK, ASSIGNOR TO I. I.

' SIIDTH & 00., OF NEW YORK, N. Y., A CORPORATION 01! NEW JERSEY.

ROTARY KILN AND cooLnn.

Application filed December 7, 1985. Serial No. 73,682.

This invention relates to rotary kilns and coolers of the general type shown in Letters Patent of the United States, No. 1,404,381 and No. 1,510,140, in which the devices in 5 which the clinker is cooled are directly as-' sociated with and in effect form part of the kiln, moving with the kiln in its rotation. The invention is concerned more particularly with rotary kilns and coolers of the construction shown in said Letters Patent No. 1,510,140, in which the clinker passes against a counter current of relatively cool air through cooling drums which are suported by the kiln and about its periphery. t has for its object to increase the efliciency of the cooling devices and to improve generall the construction and arrangement of the evices associated with the kiln. It is concerned with the means by which the cooling drums are attached to and supported by the kiln, the means by which the clinker is delivered from the kiln to the coolin drums, the rovisions to permit the remove from the kiln of such pieces or lumps of 28 clinkers as are too large to pass into the cooling drums, the means by which the leaka e of unheated air into the kiln is prevented, and the provisions wherebypit becomes possible to emplo cooling drums of 80 considerable len h wit out requiring the o erator or burner to stand too far from t e end of the kiln to observe properly the operation of the kiln.

The invention will be more fully ex- .35 plained hereinafter with reference to the accompanying drawings in which is illustrated a convenient and practical embodiment of the invention andin which:

Figure 1 is? view in longitudinal section,

partly in elevation, showing the discharge end of a kiln with its associated parts, the plane of the part in section being indicated y the broken line AA of Figure 2.

Figure 2 is a view of the same; partly in end elevation, as seen from the left-hand in Figure 1 and partly in transverse section, the one lane of the part in section being indicated by the broken line B-B of Figure 1.

In the embodiment of the invention illustrated in the drawings, the kiln is supported in the usual manner through its shell 1 by tires 2 which rest on rollers 3, mounted on suitable foundations 4. The shell 1 is pro- 68 vided with the usual refractory lining 5,

opening 9 into the corresponding cooling which is increased in thickness at the end of the burning zone, as indicated at 6, so as to retard the passage of clinker from the burning zone into the extension of the kiln beyond it, and to cause the clinker to accumulate somewhat in the burnin zone. Openings 9 are formed in the kiln, eyond the rin 6, to permit the discharge from the kiln o the smaller pieces or lumps of clinker, while the lumps which are too large to be permitted to pass through the cooling drums and thence to the grinding mill and are too large to pass through the openings 9, pass on into the extension of the kiln, the hnmg 7 of the extension being thickened, as at 8, to form a rin to retain the lar er pieces or lumps of c inker within the kiln until such time as it may be convenient to .remove them. Each openin 9 is provided with a bushin 10, inserte from the exterior of the klln and formed with a limiting shoulder 10, to limit the inward movement of the bushin A radial chute 11 serves to conduct t e clinker from each drum 12, 13, the shell being preferably formed in two parts, 12 and 13, connected by flanged rings 14. It will be understood that the cooling drums 12, 13 may have an suitable shape in cross section, althou li shown as cfylmdrical, and that there may as many 0 such cooling drums, arranged in a peripheral series about the kiln, as convenience may suggest.: Each drum is closed at its end by a head or cover 15 which may be provided with a door or handhole for observation, and the end of each chute 11 is preferably out off at an angle of about 45 degrees, to facilitate the dlscharge of the clinker from the chute into the cooling drum, and may be provided on one side or the other, according to the direction of rotation ofthe kiln, with a flight 17, which facilitates the movement of the clinker into the drum and prevent it from being picked up up and returned from the drums to the kiln as the drums revolve about the axis of the kiln in the rotation of the latter.

The feed end of each cooling drum is preferably rovided with a suitable linin 18, which a uts at one end against the en of the plate 15, and at the other against a flanged ring 19 secured within the shell. Beyond the ring 19, the shell is armed intenorly with longitudinal angle bars 20, 11

to which are connected the ends of chain loops 21. The shell 13, at its forward end, beyond the bars 20 and chains 21, is formed with a

grated opening

22, 23, for the discharge of the smaller pieces of clinker, while the

flanged end plate

24, 25 is formed with an opening through which may pass such pieces of clinker as are too large to pass through the grated opening. The smaller pieces of clinker drop into a hopper 26, with an outlet 27, through which they may pass to a suitable conveyor, not shown, while the larger lumps pass from the end of the cooling drum into a hopper 28, provided with an opening 29, through which they may be discharged to be broken up before they pass to the grinding mill. A housing 30, rising above the main floor 31. about the

hoppers

26 and 28, prevents the scattering of clinker.

In coolers of the type referred to, it is racticable to give the cooling drums a ength not greater than about one-sixth or one-fifth of the length ordinarily employed in independent rotary coolers. The volume of cooling air which, after performing its function and being itself preheated by contact with the hot clinker, passes on into the kiln to support combustion therein, is considerable. It becomes desirable, therefore, to prolong as much as possible the duration of the passage of the clinker through the cooling drums and to effect as great an exchange of heat as possible between the clinker and the air which passes in a counter current through the drums. The loose chain loops 21 perform both of these functions in a highly satisfactory degree. They retard the passage of the clinker through the drums and at the same time, being alternately buried in the clinker and then exposed to the air, they absorb heat from the clinker and give it up to the air, thereby promoting a rapid exchange of heat between the clinker and the air. As the chain loops are staggered in relation to one another. such retardation of the movement of the clinker and exchange of heat between the clinker and the air take place throughout the length of this portion of the cooling tube and throughout its revolution about the axis of the kiln. The clinker is also agitated in the movement of each drum. being lifted by the longitudinal bars and allowed to fall, and is therefore brought more or less into direct contact with the cooling air.

Each coolingdrum is supported from the kiln at its rearward or feed end by brackets 36 and straps 37 and 38, connected by bolts 39. which hold the drums securely in place and yet permit such expansion and contraction as there may be in that portion of the drum. Each drum is also supported sub stantially in the plane of its center of gravity by a flexible plate 32, which is rivetled or bolted to the end of flange 33 of the kiln shell, with an interposed spacer block 34, the other end of the flexible plate being secured to the drum by angle brackets 35. Each drum is therefore free to expand or contract under the influence of changes in temper-ature in the drum itself, as well as to move with the kiln in its expansions and contractions. At its rearward extremity, each drum is also secured directly to the shell of the kiln through the chute 11, the bushings 10 and a ring or bracket 40 riveted to the shell.

In order that cooling drums of considerable length may be employed without requiring the operator or burner to be removed too far from the end of the kiln, the burners platform 41 is provided with an extension 42 within the circle of the circumferential series of coolin drums and sufficiently above the main hoor 31 to permit the cooling drums to move throu h the space between. Such extension of the burners platform 42 is supported by cantilever beams 43 from the main burners platform 41 and for the protection of the burner, the beams 43 carry a generally circular burners hood 44, which is open at both ends and may be supported in part by a vertical frame 45. The hood 44 is spaced from the end of the kiln sufficiently to allow for the maximum expansion of the kiln.

Within the burners hood 44 are two beams 46 which, at their forward or inner ends, are pivotally supported on the sides of the hood 44, as at 47. The two beams 46 are rigidly connected at their outer ends, as by a frame or cross bar 48, and are supported from the top member of the frame 45, so as to be capable of vertical adjustment, as by threaded links 49 and coacting hand wheels 50. On the beams 46, the interconnection of which can be changed at will, are hung trolleys 51, which support the kiln closing hood 52, which can t us be drawn back to give access to the interior of the kiln when desired, but normally, by reason of the inclination of the beams 46, bears with light pressure against the flange 54 at the end of the kiln, thereby forming in operation a joint sufiiciently tight to prevent the entrance of unheated air into the kiln, all of the air which is drawn into the kiln by the draft therein being therefore forced to travel through the cooling drums 12, 13. A chain 55, connected to the burners hood 44 and to the closing hood 52, is provided so as to check backward movement of the hood 52 under the influence of a back draft in the kiln.

The fuel pipe 56, through which powdered coal or other fuel is fed into the kiln, is supported in the kiln closing hood 52 by a ball and socket joint 57, 58, the socket member 58 being held to the hood 52 by a hinged joint 59 at the top and at the lower side by a threaded, pivoted bolt 59 and hand wheel 59. The ball member 57 of the joint, which receives the outer end of the fuel pipe 56, is provided with arms 60, which carry a yoke 60. Shafts 61 threaded in the end of the arms 60 or in the yoke 60 and provided with hand wheels 61, engage the frame 61 clamped on the fixed fuel pipe 62, which also carries the socket member 58 of the ball and socket joint, whereby provision is made for adjustment of the fuel pipe 56 so as to direct the fuel properly into the kiln.

At its upper end the kiln-closing .hood 52 is formed with an o ening within an inclined flange 63, on w ich rests a similarly inclined flange 64 of a. pipe 65, which may be connected to the suction side of a fan, not shown, by which surplus of air drawn through the coolin drums and heated in its passa e by the clinker and thence drawn into 51c extension of thekiln, is withdrawn and may be used with the fuel in the fuel pipe 62. -.The pipe 65 may be supported from the to of the burners hood 4.4 as by a strap 66. t will be noted that the formation of the flanges 63 and 64, as above described permits the kiln closing hood 52 to be withdrawn on its tracks when desired without disturbing the air exhaust pipe 65.-

The door closing hood 52 may be provided with a door 67 for the convenient removal, from time to time, of the larger.

pieces or lumps of clinker which may have accumulated within the extension of, the.

- for the free movement of such. parts as ex.-

pand and contract with chan ing temperatures, that coolin drums o len h can be emp oyed without interfering wit roper observation of the kiln, that the k1 is readily accessible at all times,

' without dismantling and without loss of time, and that all accessory. parts are con structed and arranged so as to permit ready removal and re air.

It will be un erstood that various changes in details of construction and arran ement" can be made to suit different conditions of use and that, except as pointed out in the considerable terchan e of supported by thekiln about itself, connections through which the clinker is discharged from the kiln to said drums, a main floor, and a burners floor extended toward .the kiln within the circle of the circumferential series of coolin drums, the cooling drums moving throug the space between the main floor and the burners floor in the rotation of the kiln.

3. The combination with a rotary kiln having an open end, of a relatively fixed burners protective hood in front of the kiln, a kiln closin hood movably mounted within the protective hood for movement toward and from the end of the kiln, beams supported by the protective hood and inclined toward the kiln, a trolley mounted to travel on said beams, the kiln closing hood being supported by said trolle for movement toward and from the and held thereby normally toward the kiln.

4. The combination with a rotary kiln having an open end, of a relatively fixed burners protective hood in front of the kiln,

a kiln closing hood movably mounted within the protective hood for movement toward and from the end of the kiln, beams pivotally supported by said protective hood, means also supported by said protective hood to vary the inclination of said beams, a trolley mounted on said beams, the kiln closing hood being supported by said trolley for movement toward and from the kiln.

5. The combination with a rotary kiln, of a relatively fixed burners protective hood mounted in front of the kiln, a kiln closing hood inovably supported within said rotecw tive hood for movement toward an from the kiln, an air exhaust pipe connected with said kiln closing hood at its top, the kiln closing hood havin at its top an opening with an inclined e ge and the air exhaust pipe having its coacting end inclined sim1-' larly, whereby the kiln closing hood can be withdrawn without disturbing the air exhaust pipe.

6. The combination with a rotary kiln,'of

a circumferential series of cooling drums supported b the kiln about itself and open at one end or the admission of cooling air, connections through which the clinker is discharged from the kiln to said drums, and

loose chain loops supported within eachv of said drums to retard the movement of the clinker throu h the drums and to effect inthe air in the drums.

7 The combination with a rotary kiln, of a circumferential series of coohng drums 'eat between the clinker and supported by the kiln about itself and open at one end for the admission of cooling air, connections through which the clinker is discharged from the kiln to said drums, each of said drums having on its inner Wall surface a series of longitudinal angle irons and loose chain loops connected to said angle irons to retard the movement of the clinker through the drum and to efi'ect interchange of heat between the clinker and the air in the drum.

8. The combination with a rotary kiln having a circumferential series of openings for the discharge of the clinker, a circumferential series of cooling drums supported by the kiln about itself, and a series of chutes I to conduct the clinker from said openings to the cooling drums, each of said chutes being extended within the corresponding cooling drum, and provided with a flight to facilitate the movement of the clinker into the drum and to prevent the movement of the clinker from the drum back into the kiln.

9. A rotary kiln having a shell and a lining of refractory material, an internal ring of refractory material at the end of the burning zone and openings immediately in front of said ring to permlt the discharge of the smaller pieces of clinker, said shell and lining being extended forwardly beyond said openings and said shell and lining bein formed at the opposite end of the extended portion about the central opening with an internal flange and ring to prevent the escape of lar er pieces of clinker.

This app ication signed this th day of November A. D. 1925.

JOHAN S. FASTING.