EP2348269A1 - Système de récupération de chaleur sur un four rotatif - Google Patents

Système de récupération de chaleur sur un four rotatif Download PDF

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Publication number
EP2348269A1
EP2348269A1 EP11151121A EP11151121A EP2348269A1 EP 2348269 A1 EP2348269 A1 EP 2348269A1 EP 11151121 A EP11151121 A EP 11151121A EP 11151121 A EP11151121 A EP 11151121A EP 2348269 A1 EP2348269 A1 EP 2348269A1
Authority
EP
European Patent Office
Prior art keywords
heat
drive
rotary kiln
bearing
longitudinal axis
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP11151121A
Other languages
German (de)
English (en)
Inventor
Frank Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Benninghoven GmbH and Co KG
Original Assignee
Benninghoven GmbH and Co KG
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
Application filed by Benninghoven GmbH and Co KG filed Critical Benninghoven GmbH and Co KG
Publication of EP2348269A1 publication Critical patent/EP2348269A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/22—Rotary drums; Supports therefor
    • F27B7/2206—Bearing rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein

Definitions

  • the invention relates to a system for heat recovery on a rotary kiln, a rotary kiln with such a system and a method for heat recovery on a rotary kiln.
  • Rotary kilns are used for continuous processes in process engineering and have long been known in the application.
  • rotary kilns are used in the production of asphalt for drying and / or heating of moist material.
  • Rotary kilns are generally drum-shaped and rotatable about a central longitudinal axis and are therefore also referred to as drying drums.
  • the process temperature inside the rotary kiln may vary, and the temperature on the side walls of the rotary kiln may be up to 300 ° C.
  • Rotary kilns are generally rotatably driven about a central longitudinal axis via a drive / bearing device, whereby thermal isolation of the rotary kiln in the area of the drive devices is not possible since the drive / bearing device is mounted directly on the drum body of the rotary kiln. In this area, heat energy of the rotary kiln is radiated unused to the environment. It is disadvantageous that the stored energy in the walls of the rotary kiln is radiated to the environment and thus lost.
  • the invention has for its object to provide a system and method for heat recovery on a rotary kiln to recover the thermal energy generated during operation of the rotary kiln in the field of drive / bearing devices and to provide a further use.
  • the essence of the invention is that at least one drive / bearing device for arrangement on a rotary kiln is completely covered by a drive / bearing cover, in particular with respect to a central longitudinal axis of the rotary kiln.
  • a drive / bearing cover has no heat insulation.
  • a heat-dissipation device is provided for discharging the heat collected by means of the drive / bearing cover.
  • the drive / bearing device and the drive / bearing cover are arranged in a drive / bearing section.
  • the rotary kiln In the other areas of the rotary kiln, so-called insulating sections, the rotary kiln has a thermal insulation.
  • the drive / bearing cover is connected to the heat insulation such that a continuous heat insulation of the rotary kiln is given. This means that the rotary kiln is thermally insulated on its lateral surface at insulating sections and has on uninsulated drive / bearing sections drive / bearing devices for receiving radiated heat of the rotary kiln.
  • FIG. 1 An in FIG. 1 The overall arrangement shown reveals a rotary kiln 1, a heating device 3 mounted on an end wall 2 of the rotary kiln 1 for heating the rotary kiln 1 and a silencer 4 connected to the heating device 3.
  • two drive / bearing devices 5 are provided for rotatably driving the rotary kiln 1 about a central longitudinal axis 6.
  • the drive / bearing devices 5 are each covered by a drive / bearing cover 7 for heat recovery of heat of the rotary kiln 1 discharged in the area of the drive / bearing devices 5 mounted on the rotary kiln 1.
  • a heat-dissipation device in the form of a heat exchanger 8 is integrated in each case.
  • the heat exchangers 8 are each in one upper, a substrate on which the rotary kiln 1 is mounted, opposing portion of the drive / bearing cover 7 is arranged. The heat exchangers 8 are thus arranged directly adjacent to the rotary kiln 1.
  • Heat radiated from the rotary kiln 1 is transferred to air stored in the drive / bearing covers 7, the heated air automatically rising in the drive / bearing cover 7. There, the heat can be done in the heat exchanger. Due to the adjacent arrangement of the heat exchanger 8 to the rotary kiln 1 heat losses are reduced for example by transferring the heated air. The adjacent arrangement of the heat exchanger 8 to the rotary kiln 1 increases the efficiency of the heat recovery.
  • the heat exchangers 8 are connected to one another by a heat transfer line 9 and connected by means of the heat transfer line 9 to a heat storage 10. Starting from the heat storage 10, a heat transfer medium such as water in a direction of circulation 11 can flow through the heat exchanger 8 in the drive / bearing covers 7 and is then returned along the cycle direction 11 in the heat storage 10.
  • the heat recovery system of the present invention includes the drive / bearing devices 5, the drive / bearing covers 7, and the heat-dissipating devices 8.
  • the rotary kiln 1 has a rotationally symmetrical to the central longitudinal axis 6 drum body 12.
  • the central longitudinal axis 6 of the drum body 12 has alternately insulating sections 13 and drive / bearing sections 14.
  • a first insulating portion 13 is arranged , in which the drum body 12 is not a having shown thermal insulation in the form of an insulating layer.
  • the drive / bearing cover 7 is provided in the drive / bearing portion 14 in which the drum body 12 of the rotary kiln 1 has no heat insulation.
  • the drive / bearing cover 7 is adjoined by a further, identical insulating section 13 and, at the same time, the second drive / bearing cover 7, the drum body 12 being surrounded by a further insulating Section 13 is completed.
  • the insulating layer in the insulating sections 13 is connected to the adjacent drive / bearing covers 7 of the drive / bearing sections 14 at an annular end face, respectively. Accordingly, no leaks occur between the insulating layers and the drive / bearing covers 7.
  • Through the insulating layers and the associated drive / bearing covers 7 of the drum body 12 of the rotary kiln 1 is completely isolated or housed. An uncontrolled, uninsulated or unused heat output of the rotary kiln 1 is prevented.
  • the heating device 3 has a main body 15 with a longitudinal axis 60 arranged parallel to the central longitudinal axis 6, with a main body inlet opening 16 and a main body outlet opening 17, a burner arranged in the main body 15 18 and arranged in the base body 15 burner fan 19 and a fixedly connected to the base body 15 undercarriage 20.
  • the undercarriage 20 has a plurality of rotatably mounted rotary rollers 21, by means of which the heating device 3 along the longitudinal axis 60 is displaceable.
  • a rail system 22 can be used for this purpose. in principle It is also possible to equip the undercarriage 20 with wheels for other types of underground.
  • the heating device 3 to a control device, not shown, which is connected to both the burner 18 and the burner fan 19 to regulate a temperature of the burner 18 emitted heat.
  • a temperature to be set in the rotary kiln 1 can be controlled.
  • a non-illustrated connection of the control device 23 is further provided with a mounted inside the rotary kiln 1 temperature-measuring device for detecting an actual temperature in the rotary kiln 1.
  • the connection to the temperature measuring device in the rotary kiln 1 can also be omitted, so that the control device 23 assumes the function of a control device and, for example, emits heat according to a predetermined temperature-time profile. It is also possible that the heat device 23 is connected to either the burner 18 or the burner fan 19 and not both components at the same time.
  • the burner 18 is a so-called dual-fuel burner, which can be operated both with liquid fuel such as oil and with gaseous fuel such as natural gas. Therefore, a gas supply unit 24 is provided, which has an open down to the lower carriage 20, open gas connection pipe 25. A gaseous fuel is supplied via a gas distributor ring 26, on whose end facing the rotary kiln 1 a gas outlet ring 62 having a plurality of small gas outlet holes 61 is provided. The supply of the liquid fuel takes place in the embodiment shown by a nozzle 27. The nozzle 27 and the gas distributor ring 26 are arranged concentrically to the longitudinal axis 60. It is also possible to use a burner which is operated with solid, liquid and / or gaseous media.
  • the main body 15 is constructed in several parts and comprises three tube sections arranged one behind the other, wherein a first tube section 28 faces the muffler 4, a second tube section 29 adjoins the first tube section 28 along the longitudinal axis 60 and in turn a third pipe section 30 also connects along the longitudinal axis 60 to the second pipe section 29 and the end wall 2 of the rotary kiln 1 faces.
  • the adjacent tube sections 28 and 29 or 29 and 30 are fixedly connected to each other by means of a flange connection 31 by screws, but releasably. It is also possible for the adjacent tube sections 28 and 29 or 29 and 30 to be welded to one another at the flange connections 31.
  • the three tube sections 28, 29 and 30 each have identical inner and outer diameters, so that the main body 15 has constant inner and outer diameters along the longitudinal axis 60.
  • the main body inlet opening 16 is arranged facing the silencer 4, wherein the first tube section 28 is attached to the silencer 4 with a further flange connection 31.
  • an air guide element 32 is provided, which is arranged concentrically to the longitudinal axis 60 and along this has a variable cross section, wherein an inlet cross section 33 and a Outlet cross-section 34 are essentially the same size and therefore maximum.
  • a transitional cross-section 35 is provided, which is provided along the longitudinal axis 60 at the flange connection 31, which connects the first tube portion 28 with the second tube portion 29.
  • the air guide element 32 has the smallest diameter. The air guide element 32 serves to improve the flow conditions within the main body 15th
  • the second tube section 29 of the main body 15 of the burner fan 19 is arranged, which has a plurality of identical, arranged along the circumference of a fan ring 36, not even trained paddle wheels 37.
  • the third tube section 30 of the burner 18 is arranged. Furthermore, the third tube section 30 has the main body outlet opening 17, which faces the end wall 2 of the rotary kiln 1.
  • an annular disc 39 is fixed on an outer circumferential surface 38 of the third tube portion 30 adjacent to the gas distributor ring 26 of the gas supply unit 24, an annular disc 39 is fixed.
  • the disc 39 serves as a flange for fastening the main body 15 to the end wall 2 and for fastening a funnel-shaped Feuerungs-section 40 which is disposed within the rotary kiln 1, on the base body 15.
  • the disc 39 is fixed to the end wall 2 of the rotary kiln. 1 connected and serves as a shielding insulation necessary for connecting the heating device 3 opening 41 in the end wall 2.
  • the end wall 2 is stationary and therefore not rotatably connected to the rotatable about the central longitudinal axis 6 rotary kiln 1. Furthermore, the end wall is firmly connected to the heating device 3. This ensures that a rotational movement of the rotary kiln 1 relative to the stationary heating device 3 is possible.
  • the funnel-shaped design of the firing section 40 of the heating device 3 improves the delivery of hot air into the rotary kiln 1.
  • a cross section of the firing section 40 is increased in comparison to the diameter of the main body 15.
  • the muffler 4 has a damper housing 42, which is arranged on an undercarriage 20 similar undercarriage 43. On the undercarriage 43 identical rotary rollers 21 are provided for displacing the muffler 4 along the longitudinal axis 60. Specifically, the muffler 4 rolls on the same rail system 22 as the heater 3.
  • the muffler housing 42 has a first damper inlet port 44 located below the longitudinal axis 60 adjacent to the undercarriage 43 and a longitudinal axis 60 of the first damper inlet port 44 oppositely disposed second damper inlet port 45 on.
  • the damper inlet openings 44, 45 are oriented perpendicular to the longitudinal axis 60 and thus parallel to the end wall 2 of the rotary kiln 1.
  • the damper inlet openings 44, 45 are arranged parallel to each other.
  • the damper inlet openings 44, 45 are arranged in a plane oriented perpendicular to the longitudinal axis 60 or at a small distance from each other.
  • the damper inlet openings 44, 45 are the end wall 2 of the rotary kiln 1 facing and rectangular.
  • the damper housing 42 has a damper outlet opening 46, via which the silencer 4 is arranged on the main body inlet opening 16 on the heating device 3.
  • the damper outlet opening 46 is formed round and arranged concentrically to the longitudinal axis 60.
  • the main body inlet port 16 and the main body outlet port 17 are arranged concentric with the longitudinal axis 60.
  • the damper outlet opening 46 and the damper inlet openings 44, 45 are arranged parallel to each other with respect to the longitudinal axis 60 such that the openings 44, 45, 46 are in a plane oriented perpendicular to the longitudinal axis 60 or spaced from one another are arranged.
  • Such a distance is small compared to a flow path that travels air from a damper inlet port 44, 45 to the damper outlet port 46.
  • the distance is at most 5% of the length of the flow path, in particular at most 2% of the flow path and in particular at most 1% of the flow path.
  • a protective grid 47 is mounted in each case to avoid contamination of the muffler 4 and the heating device 3 with the burner 18 and the burner fan 19 arranged therein. Furthermore, the protective grid 47 serve as intervention protection.
  • damper inlet openings 44, 45 and the damper outlet opening 46 in each case a parallel to the longitudinal axis 60 oriented flow baffle 48 is arranged, which - as well as all inner sides of outer walls of the damper housing 42 - with a sound insulation 49 are provided.
  • a U-shaped rear wall 50 of the damper housing 42 arranged opposite the end wall 2 is designed in such a way that ambient air sucked in through the damper inlet openings 44, 45 flows along arc directions 51, in particular along a 180 ° turn, and the silencer 4 can leave again via the damper outlet opening 46. That is, an airflow drawn via the damper inlet ports 44, 45 is oriented parallel and opposite to an airflow exiting via the damper outlet port 46.
  • the muffler 4 is designed such that the sucked air flow of the heated ambient air is deflected, in particular by 180 ° with respect to an original flow direction.
  • the muffler 4 is W-shaped, wherein the damper outlet opening 46 in the middle, so the middle of the three W-webs, and the damper inlet openings 44, 45 are each assigned to the outside, so the two outer W-webs , This design of the rear wall, the flow conditions within the muffler 4 are further improved.
  • the system comprises the two drive / bearing devices 5, which are each mounted in a drive / bearing section 14 of the rotary kiln 1, each having a drive / bearing cover 7 for covering the drive / bearing devices 5 and in each case a heat-dissipating device 8 in the form of a heat exchanger for discharging heat recovered by means of the drive / bearing covers 7.
  • the drive / bearing device 5 comprises a concentric with the rotary kiln 1 arranged and connected to the drum body 12 race 52, which is rotatably mounted on two rollers 53 about the central longitudinal axis 6.
  • another, not shown drive / bearing device 5 may be provided in the form of a chain drive for rotatably driving the drum body 12 of the rotary kiln 1 about the central longitudinal axis 6.
  • a chain drive for rotatably driving the drum body 12 of the rotary kiln 1 about the central longitudinal axis 6.
  • the races 52 and a sprocket of the chain drive are rotatably connected to the rotary kiln 1
  • no heat insulation can be mounted in the drive / bearing sections 14.
  • the drive / bearing sections 14 are thus not thermally insulated.
  • the drive / bearing cover 7 is provided in the form of a so-called air cleaner.
  • the air duct 7 is a heat-insulated enclosure of the rotary kiln 1 with the race 52 and the rollers 53 and the chain drive in the drive / bearing sections 14, wherein in an area of the air duct 7 an inlet opening 54 is provided for the air inlet of ambient air.
  • the drive / bearing device 5 is thus arranged inside the drive / bearing cover 7.
  • the air duct 7 In an upper region of the air duct 7 is funnel-shaped and has a tapered portion, within which the heat exchanger 8 is arranged.
  • the tapered region is covered by a cover 55, wherein between the cover 55 and the upper portion of the air duct 7 an outlet opening 56 is provided for air leakage to the environment.
  • a temperature sensor 57 for detecting the temperature in the heat exchanger 8 is also arranged.
  • the temperature sensor 57 is connected to a control device, not shown, which switches on or off depending on the detected actual temperature in the heat exchanger 8.
  • the air duct 7 has side walls 58 for enclosing an outer surface of the race 52 and the rollers 53 and moreover two end walls 59 connected to the side walls 58 which provide thermal shielding of the drive / bearing device 5 along the central longitudinal axis 6 ensure.
  • the air duct 7 is connected to the end walls 59 with the heat insulation of the adjacent insulating sections 13, so that a continuous heat insulation of the rotary kiln 1 is given.
  • the drive / bearing cover 7 is connected in the region of the heat exchanger 8 to the heat transfer line 9, which constitutes a circulation line and via which the drive / bearing covers 7 are connected to the heat accumulator 10.
  • the heat storage 10 is designed as a layer heat storage.
  • a heat exchanger 8 for example, a commercial cooler of a truck can be used.
  • the heat exchanger 8 is thus also disposed within the drive / bearing cover 7.
  • the heating device 3 is used with the burner 18.
  • oxygen is needed, which is supplied via the burner fan 19 from the ambient air.
  • the muffler 4 is used.
  • the heating device 3 with the burner 18 is mounted according to the embodiment shown concentrically to the central longitudinal axis 6 of the rotary kiln 1 at the end wall 2.
  • the central longitudinal axis 6 of the rotary kiln 1 and the longitudinal axis 60 of the heating device 3 are identical.
  • the end wall 2 can be heated to above 300 ° C.
  • the heat energy is radiated via the end wall 2 to the environment, so that in the region of the end wall 2, the air is heated by about 30 ° C relative to the other ambient air.
  • the radiated heat from the end wall 2 is used to the ambient air in the form that the heated ambient air in the area between the end wall 2 and the damper inlet openings 44, 45 is sucked in and fed to the burner 18 via the burner fan 19. Thereby, the heated air is returned via the heating device 3 in the rotary kiln 1.
  • an increase in the firing efficiency of the burner 18 is achieved and thus leads to a fuel saving of about 1.5%.
  • FIGS. 1 and 6 describe the inventive method for heat recovery at the rotary kiln.
  • the air scoop 7 By using the air scoop 7, it is possible to absorb the heat radiated in the area of the drive / bearing sections 14 of the rotary kiln 1. Within the air duct 7, the heated air rises to the top, where the heat exchanger 8 is arranged in an upper region.
  • the radiation temperature of the rotary kiln is within the so-called Brenner Nach Schemes, within which the in FIG. 1 Air duct 7 shown on the right is arranged, up to 300 ° C. In the Brenner-Fern area, where the in FIG. 1 Air duct 7 shown left is arranged, the radiation temperature of the rotary kiln is about 100 ° C.
  • the air duct 7 in the burner post area is arranged adjacent to the heating device 3, the other air duct 7 in the remote burner area is arranged at a distance from the heating device 3.
  • the actual temperature is detected in the heat exchanger 8 and compared with the actual temperature in the heat storage 10. If the temperature of the heat exchanger 8 is greater than the temperature in the heat accumulator 10, the heat exchanger 8 is activated and the recovered heat via the heat transfer line 9 to the heat accumulator 10 is supplied.
  • water is preferably used as the heat transfer medium. But there are also other heat transfer media, both liquid and gaseous conceivable.
  • FIG. 1 In the embodiment shown in FIG. 1 are two drive / bearing covers 7 provided with heat accumulators 8. It is also possible to use three drive / bearing covers 7, each with a heat accumulator 8, so that for the rotary kiln 1, a power of up to 50 kW can be achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP11151121A 2010-01-20 2011-01-17 Système de récupération de chaleur sur un four rotatif Withdrawn EP2348269A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010001056 DE102010001056A1 (de) 2010-01-20 2010-01-20 System zur Wärmerückgewinnung an einem Drehrohrofen

Publications (1)

Publication Number Publication Date
EP2348269A1 true EP2348269A1 (fr) 2011-07-27

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Application Number Title Priority Date Filing Date
EP11151121A Withdrawn EP2348269A1 (fr) 2010-01-20 2011-01-17 Système de récupération de chaleur sur un four rotatif

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EP (1) EP2348269A1 (fr)
DE (1) DE102010001056A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3135996A1 (fr) * 2015-08-26 2017-03-01 Benninghoven GmbH & Co.KG Mülheim Dispositif de protection de bruleur, installation destinee a chauffer un materiau comprenant un tel dispositif de protection de bruleur et procede de protection contre la surchauffe d'un bruleur sur un dispositif de releve
CN107388817A (zh) * 2017-08-02 2017-11-24 合肥四书电子商务有限公司 一种水泥生产用回转窑

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108007214B (zh) * 2018-01-02 2024-05-07 滕州市中联重工机械科技有限公司 一种步进式加热炉汽化冷却装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD157473A1 (de) * 1981-03-19 1982-11-10 Rolf Pfeifer Vorrichtung zur lagerung von drehrohren
DE4419543C1 (de) * 1994-06-03 1996-02-08 Noell Gmbh Drehrohr mit Mantelkühlung für Verbrennungsanlagen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2813133C2 (de) * 1978-03-25 1983-04-21 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Abwärme-Rückgewinnungsanlage
DE3128191C2 (de) * 1981-07-16 1986-09-04 INTERATOM GmbH, 5060 Bergisch Gladbach Abwärmenutzung für Drehrohröfen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD157473A1 (de) * 1981-03-19 1982-11-10 Rolf Pfeifer Vorrichtung zur lagerung von drehrohren
DE4419543C1 (de) * 1994-06-03 1996-02-08 Noell Gmbh Drehrohr mit Mantelkühlung für Verbrennungsanlagen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3135996A1 (fr) * 2015-08-26 2017-03-01 Benninghoven GmbH & Co.KG Mülheim Dispositif de protection de bruleur, installation destinee a chauffer un materiau comprenant un tel dispositif de protection de bruleur et procede de protection contre la surchauffe d'un bruleur sur un dispositif de releve
CN107388817A (zh) * 2017-08-02 2017-11-24 合肥四书电子商务有限公司 一种水泥生产用回转窑
CN107388817B (zh) * 2017-08-02 2019-05-28 黄石市四棵水泥厂 一种水泥生产用回转窑

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