OA1553A - Feeder device for rotary kiln as well as furnace provided with said device or the like. - Google Patents

Feeder device for rotary kiln as well as furnace provided with said device or the like. Download PDF

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Publication number
OA1553A
OA1553A OA51536A OA51536A OA1553A OA 1553 A OA1553 A OA 1553A OA 51536 A OA51536 A OA 51536A OA 51536 A OA51536 A OA 51536A OA 1553 A OA1553 A OA 1553A
Authority
OA
OAPI
Prior art keywords
air
register
supply
oven
bucket
Prior art date
Application number
OA51536A
Other languages
French (fr)
Other versions
OA01553A (en
Original Assignee
Elektrokemisk As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NO15246964 priority Critical
Application filed by Elektrokemisk As filed Critical Elektrokemisk As
Publication of OA1553A publication Critical patent/OA1553A/en
Publication of OA01553A publication Critical patent/OA01553A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/32Arrangement of devices for charging
    • F27B7/3205Charging
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/32Arrangement of devices for charging
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/32Arrangement of devices for charging
    • F27B7/3205Charging
    • F27B2007/3247Charging through a lateral opening in the drum
    • F27B2007/3252Charging through a lateral opening in the drum with lifting scoops attached to the drum

Abstract

1,071,933. Charging rotary kilns. ELEKTROKEMISK A/S. March 12, 1965 [March 17, 1964], No. 10616/65. Heading F4B. Charge material is introduced through openings in a rotary kiln wall 1 each associated with a scoop 4 engaging a lower trough 5, Fig. 1 (not shown), a delivery shoot 3, and a spring-loaded valve 7 alternatively closing the scoop 4 and an air supply pipe 8 under control of adjustable cams 10 and 11. Arm 12 strikes cam 10 to close pipe 8 and arm 13 strikes cam 11 to close scoop 4, said cams being adjusted to give a scoop open period approximating to a 5-30 degrees sector of the kiln revolution. The charge openings may be in line along the kiln wall or otherwise disposed over the periphery thereof.

Description

PATENT

AFRICAN OFFICE AND MALAGASY

OE INDUSTRIAL PROPERTY B. P. 887 YAOUNDE (Cameroon)

International Classification: C21 No. 01553

REQUESTED ON MARCH 11, 1965 at 3:45 pm at ΙΌ.Α.Μ.Ρ.Ι. (P.V. No. 51.536) by the so-called Elektrokemisk A / S, resident in Norway. ISSUED JULY 21, 1969, published in Official Bulletin No. 2 of 1969. PRIORITY: Patent application filed in Norway under No. 152,469 on 17 March 1964 in the name of the plaintiff.

Feeder device for rotary kiln as well as furnace provided with said dis-positive or the like.

The present invention relates to a solid feed device of a rotary kiln with the aid of supply pipes which are introduced through the wall of the furnace.

It is known, in the case of prior reduction of oxidized oxides in rotary kilns, to introduce a carbonaceous, non-calcined and solid reducing agent, directly into the high temperature zone of the furnace by means of feed pipes which pass through the dufour wall. Each feed pipe is part of a bucket feeder which, during the rotation of the furnace, is immersed in a vessel which contains the solid reducing agent and which carries with it a portion of the reducing agent which, during the rotation of the oven, is poured into the supply pipes and enters the oven.

Bucket feeders, which are currently used in rotary kilns, operate in a conventional manner in the open air so that considerable amounts of air are sucked into the furnace. These quantities of air, which enter the furnace of this manner, can not be controlled and it follows that the combustion inside the furnace may be too energetic, so that the desired pre-reduction of the oxides can not be obtained. The dufour atmosphere can even become oxidizing, which increases the consumption of reducing agent. Excessive combustion also causes the charge to overheat beyond its softening temperature, so that agglutination and gluing may occur on the furnace walls.

To avoid these drawbacks, the bucket feeders have been isolated by enclosures which surround the oven in the bucket area. However, these chambers are fixed and there is a problem for sealing the gas surfaces of these buckets relative to the furnace. It has been found in practice that it is difficult to obtain a good seal between the surface of the oven and the enclosures and this solution is therefore not advantageous.

Another major disadvantage of known type feeders is that, especially because of the introduction of relatively fine raw coal through the feeders bucket, there is a risk that coal does not flow properly into the pipes . Wet coals flow only loosely along the walls of the supply pipes and they stick partially to these walls when the furrow has rotated sufficiently so that the slope of the pipe is less than the natural slope angle of the coal duct. The charcoal is then retained in the pipes for a long period of time and the fraction of coal that adheres to the hot supply pipes is easily subjected to heating and even combustion in the pipes, so that the supply pipes act as burners. their interior. The heat generated by these combustion zones in the pipes can cause localized heating of the charge in the furnace as well as the furnace coating, and this may result in clogging and agglomeration of the load in the furnace and, consequently, malfunctions in the furnace. ment. The feed pipes can even be completely obstructed so that the feed of raw material is stopped. The service life of pipes is also considerably reduced by the effect of overheating and uncontact with burning coal. The invention particularly relates to a feeding device for introducing solid charges into a rotary kiln through a wall thereof, in combination with bucket feeders equipped with feed pipes which are introduced further from the wall of the oven, the buckets plunging, during the rotation of the oven, into a container or analog, so as to carry with them a quantity of material, characterized by the fact that each supply pipe is provided with an inner register which is connected to a spring and whose position is controlled by cams or similar elements settable and placed outside the oven.

According to the invention, the above-mentioned drawbacks, which relate to the air suction effect and the obstruction of the feed pipes by the raw material, are suppressed by equipping each bucket feeder with an inner register which can be maintained In contrast to the bucket during most of a complete revolution of the furnace, at the same time metered amounts of air are injected through the feed pipes. The register is open towards the bucket [01553] 2 when the bucket arrives in its upper position and the first material contained in the bucket then flows quickly enough down the pipe so that it does not have time to warm up and take off on the walls of the pipe. The injected air also cools the damper and the supply pipe and therefore helps to prevent the load from sticking to the pipe walls and the damper.

According to the invention, the damper is common to the supply pipe and the air pipe so that the air supply and the solid feed supply can be carried out via the bucket feeders. alternately. The register is equipped with a spring and its positions are controlled by means of cleats, cams or similar devices which abut against arms or similar organs connected to the register. The damper is closed so as to allow the introduction of the feedstock during the major part of a complete furnace revolution, and it is open for feeding the load and closed for the air supply only on an angular switch wrapping the position. above the bucket feeder in question. When the hopper is closed for air supply, it is immediately opened for feeding the load and the amount of material that has been entrained by the bucket feeder in an earlier phase of the furnace evolution and which is based on the Then, the register closes in the feed pipe and enters the oven, after which the damper closes to feed the load and opens again for air supply. In this way, the supply pipes are also blow-cleaned at the same time as uncontrolled quantities of air are prevented from entering the furnace. A control of the air inlet in the feeding zone is also obtained, which makes it possible to obtain a better control of the temperature in the oven and to operate at higher temperatures without risking d 'get a gluing of the load on the furnace liner. The service life of the supply pipes is also considerably prolonged. It is also possible to have two independent registers.

It is, of course, possible to use conventional separate air injection hoses in addition to the supply hoses, if necessary. In such cases, the combustion air is introduced through the bucket feeders as well as through the separate air hoses. It is also possible to have the combustion air arrive only through the separate air hoses, if necessary. The invention also extends to a rotary kiln provided with a preceding or similar feeding device. The invention also extends to the features resulting from the description below and the attached drawings and their possible combinations.

The following description refers to the attached drawings showing an embodiment of the invention, drawings in which:

Figure 1 is a sectional view of a rotary kiln including two bucket feeders and an air supply system;

Figures 2 and 3 show in detail the common registrar and its spring system in positions corresponding respectively to the opening and closing for the supply of the load.

In the figures, the numeral 1 denotes the rotary kiln which is provided with a refractory lining 2. The turret in the direction of the arrow. The mark 3 designates a feed pipe which is provided at its end with a bucket feeder 4. In FIG. 1, it is shown that two diametrically opposed feeders, the first being placed in its lower position while the other is in its superior position. The two supply pipes are offset relative to each other so as to prevent them from dump their charges into one another. They can obviously be arranged so that a number of buckets are distributed over the length of the oven and on its circumference. For example, at least one group of two or more bucket feeders can be provided that are as close as possible to the length of the kiln without dumping their loads into each other. The air is then introduced into parallel paths in each of the power supplies of the unit and the control valve of the air supply is arranged before the branches corresponding to the air pipes. The different feeders constituting each group must be shifted relative to each other so as not to be placed in the same vertical plane along the axis of the furnace. In this way, the entry of air into each feeding zone can be kept constant since it is never completely stopped at any time, as would be the case if there was only one feeder in each zone of ALIMEN-tation.

5 indicates a container or the like which contains the material 6 intended to be introduced into the oven with the buckets 4 and the pipes 3. During the rotation of the oven in the direction of the arrow, the bucket 4 causes the material being completely or partially filled. The material entrained by the bucketrepresents on the register 7 which is kept closed against the water during most of a furnace revolution. During this period, the damper is open relative to the air pipes 8, so that the air intended for cleaning and cooling the pipe 3 as well as for maintaining the combustion inside the furrow can be The air hose 8 is equipped with separate devices to control the air supply.

It is not necessary for the air injection to be constant during the entire period when the magazine is open relative to the air pipe. The injection of air can obviously be carried out periodically, for example only during the short period following the introduction into the oven of the material contained in the bucket 4.

The register 7 is held in place by a spring 9 which is arranged so that its elastic force preserves the register in the closed position against the bucket 4 or against the air pipe 8, according to the case. The position of the register is controlled by a pair of fixed cleats, cam or similar elements 10 and 11 against which the arms 12 and 13, which are connected to the register 7, abut during the larotation of the oven. The position of the cams is independently set.

When the arm 12 which is connected to the register 7 comes into contact with the cam 10, the arm 12 is pushed down so that the spring 9 extends and the register 7 opens to allow the feeding of the oven in

Claims (6)

  1. [01553] 3 material contained in the bucket 4. The position of the registeret of the arm before the arm 12 does not come into contact with the cam 10 is highlighted in Figure 3.When the arm 12 and the spring 9 have crossed their neutral position, the force of the spring applies leregister against the mouth of the air pipe 8 and closes so that the passage, allowing thecharcontenue in the bucket 4 to get inside the oven, is cleared . This position is highlighted in FIG. 2. As the oven continues to rotate, the arm 13, which is also connected to the register 7, comes into contact with the blade 11 and is pushed upwards so that the spring is again elongated. and that the register 7 isopened so as to allow air supply via the air hose 8. When the arm 13 and the spring 9 have passed their neutral position, the force duressort pushes the register upwards against the bucket 4 and closes the supply pipe 3, at the same time that it establishes a passage for the air flowing in the air pipe 8, as shown in Figure 3. The cams 10 and 11 are arranged relative to each other. the other so that a sufficient period of time elapses for the emptying of the bucket 4. Usually, a period of opening corresponding to a furnace evolution fraction of between 5 ° and 30 ° is sufficient but it can obviously be chosen inf greater than 5 ° or greater than 30 °. The angle is a function of the speed of the furnace revolution as well as the particle size of the carbonaceous material, its degree of moisture, the natural slope angle, etc., and practical tests should therefore be made in each case for determine the angular sector in which the register must be opened to allow the feeding of the load. The cams 10 and 11 are adjustable independently of each other. It is obvious that the invention is not limited to the embodiments described above and represented and from which other forms and other embodiments may be provided without making it possible to depart from the scope of the invention. . SUMMARY The invention extends in particular to the following characteristics and their possible combinations: 1 ° Feeding device for introducing solid discharges into a rotary kiln through a wall thereof, in combination with feeders to buckets equipped with feed pipes which are introduced through the wall of the oven, the buckets, during the rotation of the oven, into a container or the like so as to carry with them a certain amount of material, characterized by the fact that each tube of The supply is provided with an internal register which is connected to a spring and whose position is controlled by cams or similar adjustable elements and placed outside the oven, which ensures a regular supply.
  2. 2 ° The damper opens and closes respectively to allow the supply of air through the supply pipe, so that the introduction of the solid charge and the introduction of the powerful air can be effected alternately for different positions of the register.
  3. 3 ° The register opens to allow the introduction of the load only in a certain angular sector wrapping the upper position of the tuyaud'alimentation during a revolution of the furnace.
  4. 4. The supply of air is effected in a continuous manner in the fraction of a complete furnace revolution in which no solid charges are introduced.
  5. 5. The supply of air is carried out periodically in the fraction of a complete revolution in which no chargesolide is introduced.
  6. 6 ° Rotary kiln provided with a feeding deviceconforme or similar to the preceding. Company called: ELEKTROKEMISK A / S By proxy: Benjamin Matip
OA51536A 1964-03-17 1965-03-11 Feeder device for rotary kiln as well as furnace provided with said device or the like. OA1553A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NO15246964 1964-03-17

Publications (2)

Publication Number Publication Date
OA1553A true OA1553A (en) 1969-07-21
OA01553A OA01553A (en) 1969-07-21

Family

ID=19908938

Family Applications (1)

Application Number Title Priority Date Filing Date
OA51536A OA1553A (en) 1964-03-17 1965-03-11 Feeder device for rotary kiln as well as furnace provided with said device or the like.

Country Status (8)

Country Link
US (1) US3357689A (en)
BR (1) BR6567914D0 (en)
CH (1) CH467984A (en)
ES (1) ES310626A1 (en)
FI (1) FI43743C (en)
FR (1) FR1428397A (en)
GB (1) GB1071933A (en)
OA (1) OA1553A (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034968A (en) * 1974-07-12 1977-07-12 Mendenhall Robert Lamar Asphalt mixing apparatus
US4025297A (en) * 1975-09-22 1977-05-24 Sunbeam Equipment Corporation Rotary retort furnace
US4787938B3 (en) * 1986-06-30 1999-11-30 Standard Havens Countercurrent drum mixer asphalt plant
US5224433A (en) * 1988-11-23 1993-07-06 Cadence Chemical Resources, Inc. Waste fuel delivery to long kilns
US5058513A (en) * 1988-11-23 1991-10-22 Benoit Michael R Energy recovery from containerized waste
US4974529A (en) * 1988-11-23 1990-12-04 Cadence Chemical Resources, Inc. Method for energy recovery from containerized hazardous waste
US4930965A (en) * 1988-11-23 1990-06-05 Cadence Chemical Resources, Inc. Apparatus for charging solid fuel to rotary kilns
US5083516A (en) * 1988-11-23 1992-01-28 Cadence Chemical Resources, Inc. Processed wastes as supplemental fuel for modified cement films
US5156676A (en) * 1990-04-13 1992-10-20 Hoke M. Garrett Manufacture of cement clinker in long rotary kilns by the addition of volatile fuel elements directly into the calcining zone of the rotary kiln
US5122189A (en) * 1990-04-13 1992-06-16 Hoke M. Garrett Manufacture of cement clinker in long rotary kilns by the addition of volatile fuels components directly into the calcining zone of the rotary kiln
US5226774A (en) * 1991-01-28 1993-07-13 Cadence Chemical Resources, Inc. Device for charging combustible solids to rotary kilns
US5078594A (en) * 1991-01-28 1992-01-07 Cadence Chemical Resources, Inc. Device for charging combustible solids to rotary kilns
US5257586A (en) * 1992-02-26 1993-11-02 Davenport Ricky W Method and apparatus for feeding to a rotary device
US5339751A (en) * 1992-09-01 1994-08-23 Ash Grove Cement Company Apparatus and method for charging combustible solids into a rotary kiln
US5549058A (en) * 1995-04-10 1996-08-27 Cadence Environmental Energy, Inc. Method and apparatus for charging a bulk material supplemental fuel into a long cement kiln
US6234091B1 (en) 1999-11-23 2001-05-22 Thomas R. Largent Feed chute apparatus for gravity feeding tires and other materials in to a rotating kiln
US6735906B1 (en) 1999-12-31 2004-05-18 Thomas R. Largent Warp resistant access door assembly for a high temperature combustion chamber
US6231288B1 (en) 1999-12-31 2001-05-15 Thomas R. Largent Conveyor head and lift for feeding tires into a rotating kiln
DE102005052753A1 (en) * 2005-11-04 2007-05-10 Polysius Ag Plant and process for the production of cement clinker
CN103591806B (en) * 2013-07-19 2015-07-29 浙江环立环保科技有限公司 A kind of mechanical ejection material device and enter kiln method in cement kiln synergic processing

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US644057A (en) * 1899-02-20 1900-02-27 Gates Iron Works Rotary kiln.
US1415990A (en) * 1919-12-08 1922-05-16 American Metal Co Ltd Rotary kiln
US1830002A (en) * 1929-03-27 1931-11-03 Harry R Struthers Apparatus for roasting material

Also Published As

Publication number Publication date
FI43743C (en) 1971-06-10
FR1428397A (en) 1966-02-11
CH467984A (en) 1969-01-31
ES310626A1 (en) 1965-06-01
OA01553A (en) 1969-07-21
US3357689A (en) 1967-12-12
GB1071933A (en) 1967-06-14
BR6567914D0 (en) 1973-02-22
FI43743B (en) 1971-03-01

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