DE2164563B2 - Gas and air supply for a rotary kiln heated with jacket burners - Google Patents

Description

3 4

From the USA patents 3132 023 and rotary kiln in the kiln shell two opposite

3 235 375 devices are known in which so-called discharge openings are provided, the

probably air and fuel lines, which deal with gas lines and the air lines in groups

rotate the rotary kiln, are arranged outside the rotary kiln between the discharge openings,

Oven lie, with a connection between the 5 With the invention is achieved that opposite

rotating and non-rotating lines, incomparable gas and combustion air supply

This does not require any seals that allow cooling and maintenance of the rotary kiln.

Diameter than the furnace shell. This improves the furnace components,

known devices, as well as in the A preferred embodiment of the invention sees

U.S. Patents 2,848,198, 3,196,938 and io suggest that the gas and air distribution boxes are made from

3 011772 known devices, treatment will consist of a cylindrical sleeve with an opening

tes material have through an opening from the rotary tube and an annular channel through

furnace, which is located in the middle of the seal and a cylindrical collar and two ring walls

consequently a smaller one is necessarily formed from which the gas and air ducts

Has diameter than the furnace shell. Branch off at a 15 gene.

According to a preferred arrangement of the air ducts, the rotary kiln must be of such a construction Contain a relatively large charge, each of which can be placed between two gases the material lay over one of the discharge pipes.

end formed dam (United States patent The rotary kiln according to the invention can flow a 3 235 375); or the rotary kiln must also be provided with jacks on the inside of the rotary kiln at the discharge end (USA patents have furnace head, which is from a stationary address 3 848 198, 3 011 772 and 3 196 938); or the orderly hood is surrounded, a discharge passage must be arranged between the rotary kiln with a double shell or groups of gas and air lines in the hood, a double-walled housing and lifting elements.
35 In a rotary kiln according to the invention, the carry back to the feed end of the rotary kiln with a concentric to its central axis to move an oven (US Pat. No. 3,132,02S). is equipped with an orderly central burner

Another rotary kiln for metallurgical advantageously accessible arrangement of the same Gege purposes is from the German patent 618 872 ben, if the central burner is known by the gas distributor. A supply of reaction gases takes place at the ventilation box, the air distribution box and the end of this Rotary kiln via a pipe system that extends through the wall.

The invention is described below with reference to the

Neten gas distribution box over part of the external drawing, for example, described. In this shows

Ren furnace shell extends. For the supply of air F i g. 1 is a view of the furnace head, partially in

by means of a fan is in this known rotary kiln 35 section, a rotary kiln with a gas supply

oven the arrangement of fans on the oven maneuvering distribution and a discharge for the treated

tel provided. Material,

Another known for burning cement- F i g. 2 an end view along line II-II in the rotary kiln (German patent 599 277) F i g. 2 in the direction of arrows and
has an annular ring surrounding the furnace jacket. 3 shows a partial view in section along the air supply box, which is never open towards the furnace shell III-III in FIG. 2 in the direction of the arrows. The air distributor engages in the open side as shown in FIG. 1 and 2 stationary hood shown lungskasten final sealing ring, which is omitted from the furnace head.
revolves with the furnace jacket and from a radial in After F i g. 1, a rotary kiln has an air line 45 leading to the interior of the kiln jacket and the kiln jacket 1, which is penetrated in a not shown. The air distribution box is mounted in known ways to rotate around a fan with air that rotates about an in-center axis AA. According to FIG. 3, the distribution system of the furnace shell lying inside the furnace shell 1 is lined in a heat-resistant manner and has a pair of radial discharge openings 2, 3 in the burner directed towards the central point protruding axially into the rotary tube. In this known 50, too, the discharge end 4 of the furnace shell 1 is rich; Rotary kiln is a larger seal than the man- after Fi g. 2 and 3 the discharge openings 2 are required, and the air distribution system 3 in the furnace shell 1 is offset by 180 °, the system lies within the furnace shell. Thus, with every revolution of the furnace shell 1

The invention is based on the object of creating a compact, 55-ches treated material in the area of the discharge openings 2, 3 located in the area of the discharge openings 2, 3, due to the heavy density of gas and air distribution, with an unimpeded discharge through the furnace jacket 1 twice of the treated goods are discharged,
is possible. According to the F i g. 1 and 3, a furnace head 5 is concentrated

In order to achieve the stated object, an annular 60 is first attached to the discharge end 4 of the furnace shell according to the invention and connected to it. The air distribution box concentrically to the central axis of the furnace head 5 therefore rotates with the furnace shell 1 of the rotary kiln between the gas distribution chamber around the central axis AA and has two end walls 6 and the end wall is arranged, and 7. These end walls 6, 7 are of sleeves 8 diameter smaller than the furnace jacket and penetrated larger, which is radially outside the furnace jacket 1 than that of the gas distribution box, and that the 65 are and the end walls 6 and 7 in the axial exhaust air distribution box withstand the gas lines in a ring shape. The end wall 6 has a neck 6 a which is concentric to the axis and via air lines with the Mantelbren- AA , through which a benern is connected. and that at the discharge end of the known central burner 9 back into the furnace shell 1

5 6

protrudes through. At the end of the neck 6 α is a flange 10 gas pipes 50 which are substantially parallel to the axis

firmly attached. Between the flange 10 and the AA of the furnace shell 1 on the circumference of the same

Central burner 9 is a bellows seal 11 are arranged and between axially parallel Ab-

The bellows seal 11 has a flange 1.2, which intersected 52 and the gas distribution box 20 pipe

does not rotate and with the rotating flange 10 5 sections 55, 56 have. From these pipe sections

engages to create a frictional seal between 55, 56 bifurcate the pipe sections 56 from the

see the central burner 9 and the rotating gas distribution box 20, run inside the

Neck 6 α of the end wall 6 to create. Inside diameter of the air distribution box 23

The central burner 9 is parallel to the axis over a Brennluftlei- to the neck 6 α and go in the radially

device 16 and a fuel gas line 17, the pipe sections 55 running through the end wall 6

together with the central burner 9 on one to- over, the one in the remaining one on the jacket pipe

retractable burner support 18 rest. lying pipe sections 52 pass over to which

The rotary kiln also has jacket burners 54 to which jacket burners 54 are connected,

on, only one of which is shown in FIG. 1 is shown. In the area of the furnace head 5, the

The jacket burner 54 is supplied with combustion air, 15 cuts 52, 53 the sleeves 8. To protect against

an air distribution box 23 is provided. This heat and treated material from the inside of the furnace

The air distribution box 23 has the shape of a after the sleeves 8 are in discharge passages 62, 63

externally open ring channel with walls 43, 42, 44, leaving cast ring parts on the refractory material 60,

which rotates with the furnace shell 1 and embedded by a 61 shown in FIG. 2 are indicated. This

non-rotatable cylindrical sleeve 40 using ao embedding can be potted in place

is sealed by ring seals 46, 47. In the take place.

Sleeve 40 guides a combustion air line 24, a Helene sections 52 and 53 coming from a not shown around the discharge openings 2, 3 from the axle-saving combustion air supply, which is routed on the jacket over the combustion air and combustion gas pipes lying around the air distribution box 23 combustion air. This combustion air flows through combustion air as 51, 50 to be kept free, these are to be kept free in between the outlets 51, the groups lying essentially parallel to the axis of the support openings 2, 3 - AA of the furnace shell 1 on the circumference thereof. These groups are arranged by adding in FIG. 2 and have pipe sections 57, 58 between axially parallel offsets of α and b to the reference numbers for the sections 52 passing through 53 and the air distribution box 23 through the furnace head 5. Marked by these Rohrab- 30 and 53. Thus, the sections form 57, 58 branch off the pipe sections 58 from 52 a, 53 a a first and the sections 52 b and the air distribution box 23, run axially sparingly 53 b a second group.

allele to the neck 6a and go in the radial direction of the As shown in Figures 1 and 2 is the circumferential frontal wall 6 extending pipe sections 57 over, catch the furnace head 5 from a stationary hood which are surrounded in the remaining, on the jacket tube 1 35 64, which in their lower area a Go over lowing pipe sections 53, to which the discharge passage 65 has, with the rotating jacket burner 54 are connected. the discharge openings 2, 3 from the furnace material 1

The fuel gas supply of the jacket burners 1 alternately coincide. To seal the

follows by means of a gas distribution box 20. Also a joint between the furnace head 5 and the hood 64

the gas distribution box 20 has the shape of a sealing devices 66, 67 are provided according to 40,

externally open annular channel with walls 30, 31, 32, these sealing devices each have one

which rotates with the furnace shell 1 and by a sealing ring 68 that rotates with the furnace head 5

non-rotatable cylindrical sleeve 28 using and one attached to the hood 64 non-rotatably

is sealed by ring seals 34, 35. In the sealing ring 69. The sealing rings 68 and 69

Sleeve 28 leads a with a 45 not shown by means of a swivel arm 70 with a Ge

Fuel gas supply connected fuel gas line 21, weight 71 pressed against each other, whereby through the

A seal is created by means of the rubbing system which supplies fuel gas to the gas distribution box 20

to be led. This fuel gas flows through fuel is produced.

1 sheet of drawings

Claims (5)

ι 2 gas are supplied and with radially arranged, claims: is provided on the circumference of the furnace shell distributed discharge openings. 1. With jacket burners heated at the discharge rotary kiln are among other things to the Rsduzieende the turning of iron ore to a lower oxidation tube furnace, closed by an end wall, where the jacket torch is used by one state. Examples are in the annular, concentric about the shell axis- USA.-Patents 1216 667, 1760 078 and arranged on the outside of the end wall. 2 344440. These rotary kilns have Gas distribution box over on the furnace exterior between non-rotating duct structures Jacket-mounted gas pipes with fuel gas and rotating pipe structures from supplies and with radially arranged divider systems that have a diameter Discharge water distributed around the circumference of the furnace jacket, which is larger than the diameter of the furnace opening is provided, thereby giving a characteristic jacket. It's always been difficult, good ones draws that a ring-shaped air distributor seals with such large diameters to konlungskasten Structure (23) concentric to the central axis of the 15, since the thermal expansion in the case of a large rotary kiln between the gas distribution bar the dimensions increase proportionally and it is arranged most (20) and the end wall (6), the dimensional tolerances and above it is more difficult Diameter smaller than the furnace shell to ensure surface finishings that are suitable for (1) and larger than that of the gas distribution box effective seals are required. For cables (20) is, and that the air distribution box (23) 20 gene and nozzles that only air to the rotary kiln ring around the gas lines (SO, 52, 55, 56), this problem is not important because and over air lines (Sl, 53, 57, 58) with it is harmless if air through the seals the jacket burners (54) is connected, and that emerges from the rotary kiln. Besides, the at the discharge end of the rotary kiln in the kiln economy loss due to an air leak jacket two opposite discharge openings 25 not large. All known patents explain genes (2, 3) are provided, the gas lines therefore arrangements that allow the supply of gaseous (50, 52, 55, 56) and the air lines (51, according to fuel through such distribution systems) 57, 58) in groups between the discharge, avoid leaks of flammable gases both Openings (2, 3) are arranged. a danger as well as a significant economic 2. Rotary kiln heated with jacket burners 30 can mean loss. according to claim 1, characterized in that, according to the above-mentioned three patents, the gas and air distribution boxes (20, 23), a reducing atmosphere is introduced into the rotary tube of a cylindrical sleeve (28, 40) with an opening furnace, in which fuel is introduced through an outlet (29, 41) and an annular central burner is injected into the groove (30, 42) that protrudes through a cylindrical 35 material discharge end of the rotary kiln, throat collar (45) and two ring walls (31, and the first two of these patent specifications descriptive 32 and 43, 44) is formed, from which the gases also branch off the inclusion of combustible material and air lines (50, 51). i _n the feed material feed to the turning 3. Rotary kiln heated with jacket burners. according to claim 1, characterized in that 40 In further arrangements it is known to gasförjedes Air duct (52) between two gaseous fuels in such a rotary kiln service pipes lies. inject without making seals with such a large one 4. With jacket burners heated rotary kiln diameter are required. After the USA.-Panach Claim 1, characterized in that tentschrift 1 797 130 is fuel by means of a At the discharge end, a single ring tube connected to the furnace is injected, which extends along the dener furnace head (5) is located, which extends from a stationary central axis of the rotary kiln and nozzles när arranged hood (64) is surrounded, and has which voraß from the tube radially outward between the groups of gas and air lines. According to U.S. Patents 2,848,198, in the hood (64) a discharge passage 3 182 980 and 3 196 938 are several axially (65) is arranged. 50 stretching fuel lines within the furnace 5. With jacket burners heated rotary kiln shell or the furnace jacket provided. From the according to claim 1, characterized in that US Pat. No. 3,011,772 is a double-walled one a central burner (9) known from the gas distribution rotary kiln, with the gaseous combustion box (20), the air distribution box (23) and the fabric between the walls the end wall (6) extends through it. 55 space is supplied. With all these well-known Rotary kiln constructions are seals between stationary and rotating fuel feed Guiding lines provided that have a diameter which is smaller than the outside diameter of the 60 arrangement: however, all of these devices have two disadvantages. One disadvantage is The invention relates to a jacket with burners that the lines for the gaseous fuel heated, not closed off from the atmosphere of the surrounding air by an end wall at the discharge end Rotary kiln, where the jackets are set to be cooled, and a second one burner of an annular, concentric around 65 disadvantage is that such lines do not the jacket axis, are visible on the outside of the end wall and are therefore not inspected Gas distribution box over on the can while the rotary kiln is in operation Outer jacket of the furnace attached gas lines with fuel is.