US3883294A - Heat treating apparatus - Google Patents

Heat treating apparatus Download PDF

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Publication number
US3883294A
US3883294A US412632A US41263273A US3883294A US 3883294 A US3883294 A US 3883294A US 412632 A US412632 A US 412632A US 41263273 A US41263273 A US 41263273A US 3883294 A US3883294 A US 3883294A
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US
United States
Prior art keywords
grate
heat treatment
dust removal
conduit
chambers
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.)
Expired - Lifetime
Application number
US412632A
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English (en)
Inventor
Horst Ritzmann
Hans Mollenkopf
Wolf Goldmann
Jurgen Wurr
Reinhard Korting
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Polysius AG
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 Polysius AG filed Critical Polysius AG
Application granted granted Critical
Publication of US3883294A publication Critical patent/US3883294A/en
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Expired - Lifetime 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
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines
    • 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
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • HEAT TREATING APPARATUS Inventors: Horst Ritzmann; Hans Mollenkopf,
  • ABSTRACT A device for the heat treatment of material including a traveling grate conveyor for supporting material to be treated, at least one gas receiving heat treatment chamber and at least one grate space disposed above and below, respectively, a section of the traveling grate conveyor, and mechanism for passing exhaust gases through the material and the section from the overhead chamber to the underlying space. Dust removal mechanism is connected to the grate space and purifies the exhaust gases taken through the material.
  • HEAT TREATING APPARATUS BACKGROUND OF THE INVENTION This invention relates to apparatus for heat treating material, supported by a traveling grate conveyor, with hot exhaust gases taken from a furnace which subsequently treats the material.
  • Devices of the type disclosed herein are generally used for the heat treatment of material, such as raw ground cement, lime, and fertilizers, for example, in finely grained or pelleted form, and include a traveling grate conveyor which is used to support the material that is preheated on the grate and then fired in a following furnace, for instance a rotary tube furnace.
  • the furnace exhaust gases enter a traveling grate, or a heat treatment chamber, adjacent the furnace inlet at a level above the section of a grate type conveyor chain which carries the material.
  • the hot exhaust gases then pass through the layer of material and through the supporting section of the traveling grate chain. If the traveling grate chain stops, for instance when the plant as a whole is starting up or stopping, or during breakdowns, there is a risk of the chain members, at least, being damaged by excessive over-heating. For this reason, the procedure on stoppage of the traveling grate chain has been not to take the furnace exhaust gases through the layer of material but to by-pass them into the atmosphere via an auxiliary exhaust gas flue connected to the said heat treatment chamber. But since the exhaust gases include a considerable amount of dust, discharging them into the atmosphere necessarily leads to undesired contamination of the surroundings.
  • the invention is therefore based on the problem of developing further a device of the type initially described, whe eby, with relatively simple means, dust can be removed from the furnace exhaust gases discharged directly from the heat-treatment chamber when the traveling grate chain is at rest.
  • this problem is solved by the provision of a tubular conduit which connects a heat treatment chamber to a dust-removal means, while by-passing at least one section of the traveling grate which carries material.
  • the dustremoval means which are in any case present, are used to remove dust from the furnace exhaust gases discharged directly from the heat treatment chamber.
  • the connection between the heat treatment chamber and the dustremoval means can be formed with the aid of relatively simple constructional features.
  • the by-pass conduit incorporates a device for cooling the exhaust gases, which can be achieved in simple manner, for example by spraying in cold water or by supplying fresh air.
  • FIG. 1 is a longitudinal sectional view through a device constructed according to the present invention.
  • FIG. 2 is a sectional end view, taken along the line llll of FIG. 1.
  • a device constructed in accordance with the invention includes a traveling grate having generally designated l, which includes an endless traveling grate chain 15 which receives material 5 to be treated, from a hopper or inlet 10 and conveys it downstream in the direction respresented by the arrow 2.
  • the traveling grate housing 1 is divided by the traveling grate into upper and lower compartments, the upper compartment including a vertical partition forming a first heat treatment chamber 7, preceded by an upstream or second heat treatment chamber 9, which receives material 5 from the hopper l0, and a discharge section or part 4.
  • a material firing, rotary tube furnace, generally designated 3, is mounted adjacent the grate housing I and includes an inlet adjacent the discharge part 4 of the traveling grate which on the one hand conveys the material 5 as a layer into the rotary tube furnace inlet, and on the other hand conveys the furnace exhaust gases, represented by the arrow 6, from the rotary tube furnace 3 into the first heat treatment chamber 7.
  • the heat treatment chambers 7 and 9 lie above an upper run section 8 of the traveling grate conveyor chain 15 which carries the material 5.
  • the second heat treatment chamber 9 is somewhat smaller than the heat treatment chamber 7 and acts as a drying chamber for the material 5 freshly supplied from the hopper 10 for treatment, while the first, downstream heat treatment chamber 7, which is somewhat larger than drying chamber 9, acts as a hot chamber or preheater chamber.
  • the compartment, below the material-carrying section 8 of the conveyor 15 is sub-divided by a partition to form two intermediate grate spaces 11 and 12, with the first intermediate grate space 11 disposed in general in the area below the first heat treatment chamber 7 and the second intermediate grate space [2 below the second heat treatment chamber 9.
  • the portion of the housing 1 which defines both of these intermediate grate spaces 11 and 12 is connected to underlying, material-receiving hoppers l3 and 14 respectively, which receive the treated material 5 that has inadvertently fallen through the endless, traveling grate material conveying chain 15.
  • a fan 20 is preferably disposed in the gas conduit in the vicinity of intermediate dust-removal means 18 and reinforces the extraction of exhaust gases from the intermediate grate space 1].
  • At least one traveling grate side wall which defines the intermediate grate space 12, is provided with gas passage holes 21 which are joined via a connecting conduit 22 to a dust-removal means 23, preferably an electro-filter.
  • a dust-removal means 23 preferably an electro-filter.
  • the purified exhaust gases are discharged through a pur gas conduit 25, not shown in detail, to the atmosphere.
  • the first heat treatment chamber 7 is connected at the top of a flue 26 which as will be explained in more detail below, acts as an auxiliary exhaust gas flue and can be closed by a valve 26a.
  • the auxiliary exhaust gas flue 26 is connected to a by-pass tube conduit 27 which terminates in the intermediate grate space 12, so that in this manner the first heat treatment furnace 7 can be connected to the dust-removal means 23 while by-passing the material-supporting section 8 of the traveling grate.
  • a similar connection between the first heat treatment chamber 7 and the dust removal means 23 which purifies the used exhaust gases to be discharged could also be formed by connecting the one end of the bypass tube conduit 27 directly to the first treatment chamber 7, and the other end of the by-pass tube conduit 27 either to the connecting conduit 22 or directly to the dust removal means 23.
  • a cooling fluid e.g. water
  • fresh air may be fed which is mixed with the exhaust gases.
  • bypass tube conduit 27 is provided with control means, such as cutoff and/or throttle members, eg at 29, which can be controlled in dependence on the movement of the traveling grate chain 15.
  • control means such as cutoff and/or throttle members, eg at 29, which can be controlled in dependence on the movement of the traveling grate chain 15.
  • the cut-off or throttle members are opened on stoppage of the traveling grate chain so that the hot exhaust gases do not flow through the layer of material in the section of the trav eling grate chain 15 which carries the material over the space 11, but rather flow in the direction represented by the dotted arrow 30. The hot gases thus cannot cause any damage or destruction of the chain 15 which overlies the space 11.
  • the hot gases, flowing in the di rection of the arrow 30, are drawn by the fan 24 through the conduit 27 where it is cooled by the cooling device 28, prior to passing through the section of material conveying chain 15 that is disposed over the pace 12.
  • the conduit 17 between the in termediate grate space 11 and the dust removal means 18 is provided with throttle members which, when the grate chain 15 stops, interrupt the connection to the dust removal means 18 and thus to the fan 20. This ensures more reliable extraction of the hot furnace ex haust gases through the by-pass tube conduit when the grate chain 15 is at rest. This latter object could, however, also be achieved by switching off the fan 20.
  • the device provided by the invention ensures that on stoppage of the grate chain 15 the hot fur nace exhaust gases extracted directly from the heat treatment chamber lying above the material-carrying section 8 of the traveling grate are sufficiently cleared of dust before discharge into the atmosphere.
  • a device for the heat treatment of material with hot gas comprising: a traveling grate including a section for supporting material to be treated and conveying it in a forward path of travel; means including at least one heat treatment chamber above said grate section for directing hot gases from one side of said grate and the material supported thereby to an intermediate grate space below and at the other side of said grate and said material supported thereby; dust removal means for purifying the gases after they have passed through the material; and means connecting the heat treatment chamber to said dust removal means while by-passing said traveling grate section, said connecting means including a tubular by-pass tube conduit connected to the dust removal means via a portion of said intermediate grate space.
  • a device as in claim 1 including means in the by pass conduit for cooling the hot gases.
  • bypass tube conduit is provided with throttle means which can be controlled in dependence on the movement of the traveling grate section.
  • a device for the heat treatment of material with hot gas comprising: a housing; a traveling grate disposed within said housing for supporting and conveying material to be treated, said grate establishing within said housing upper and lower compartments separated by said grate; means carried by said housing and separating said upper compartment into first and second heat treatment chambers for directing hot gas from said chambers through material supported on said grate to said lower compartment; means carried by said housing and separating said lower compartment into first and second spaces corresponding substantially to said first and second chambers; means connecting the first one of said spaces with the second one of said chambers; stack means; dust removal means connecting said stack means with the second one of said spaces; conduit means connecting said first chamber with said dust removal means; and control means for selectively enabling and disabling hot gas to flow through said conduit means to said dust removal means from said first chamber and by-pass both of said spaces.
  • a device including means for introducing a cooling fluid to said conduit means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Tunnel Furnaces (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Processing Of Solid Wastes (AREA)
  • Drying Of Solid Materials (AREA)
  • Incineration Of Waste (AREA)
US412632A 1972-11-15 1973-11-05 Heat treating apparatus Expired - Lifetime US3883294A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2256034A DE2256034C3 (de) 1972-11-15 1972-11-15 Einrichtung zur Wärmebehandlung von Gut auf einem Wanderrost

Publications (1)

Publication Number Publication Date
US3883294A true US3883294A (en) 1975-05-13

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ID=5861827

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Application Number Title Priority Date Filing Date
US412632A Expired - Lifetime US3883294A (en) 1972-11-15 1973-11-05 Heat treating apparatus

Country Status (9)

Country Link
US (1) US3883294A (xx)
JP (2) JPS4978728A (xx)
AT (1) AT329429B (xx)
CH (1) CH558924A (xx)
DE (1) DE2256034C3 (xx)
ES (1) ES420089A1 (xx)
FR (1) FR2209447A5 (xx)
GB (1) GB1421394A (xx)
IT (1) IT998944B (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0334231A2 (en) * 1988-03-18 1989-09-27 Fuji Photo Film Co., Ltd. Microfilm searching and reading device
EP1260489A1 (fr) * 2001-05-23 2002-11-27 Carrières du Boulonnais Procédé de fabrication d'un ciment sulfo-alumineux et/ou ferro-alumineux, ciment obtenu par ce procédé et installation de mise en oeuvre
US20130104873A1 (en) * 2011-06-30 2013-05-02 Daniel S. Henry Pellet furnace
US20160097593A1 (en) * 2013-05-08 2016-04-07 Sandvik Materials Technology Deutschland Gmbh Conveyor furnace
WO2016125115A1 (en) * 2015-02-06 2016-08-11 Saipem S.P.A. Plant and method for recovering metals and/or metal oxides from industrial process waste, in particular refinery waste
CN115305349A (zh) * 2022-08-26 2022-11-08 钢研晟华科技股份有限公司 一种减少脱硫脱硝消耗的链篦机回转窑设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60126505U (ja) * 1984-02-03 1985-08-26 株式会社新潟鐵工所 アスフアルト混合物製造装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671027A (en) * 1970-09-24 1972-06-20 Hanna Mining Co Heat processing of minerals

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671027A (en) * 1970-09-24 1972-06-20 Hanna Mining Co Heat processing of minerals

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0334231A2 (en) * 1988-03-18 1989-09-27 Fuji Photo Film Co., Ltd. Microfilm searching and reading device
EP0334231B1 (en) * 1988-03-18 1994-10-12 Fuji Photo Film Co., Ltd. Microfilm searching and reading device
US6833105B2 (en) 2001-05-23 2004-12-21 Carrieres Du Boulonnais Method for making aluminate cement
WO2002094732A1 (fr) * 2001-05-23 2002-11-28 Carrieres Du Boulonnais, S.A.S. Procede de fabrication d'un ciment sulfo-alumineux et/ou ferro-alumineux, ciment obtenu par ce procede, et installation de mise en oeuvre
FR2825086A1 (fr) * 2001-05-23 2002-11-29 Carrieres Du Boulonnais Procede de fabrication d'un ciment sulfo-alumineux et/ou ferro-alumineux, ciment obtenu par ce procede, et installation de mise en oeuvre
US20030001306A1 (en) * 2001-05-23 2003-01-02 Carrieres Du Boulonnais Method and apparatus for making aluminate cement
EP1260489A1 (fr) * 2001-05-23 2002-11-27 Carrières du Boulonnais Procédé de fabrication d'un ciment sulfo-alumineux et/ou ferro-alumineux, ciment obtenu par ce procédé et installation de mise en oeuvre
US20130104873A1 (en) * 2011-06-30 2013-05-02 Daniel S. Henry Pellet furnace
US20160097593A1 (en) * 2013-05-08 2016-04-07 Sandvik Materials Technology Deutschland Gmbh Conveyor furnace
US10480860B2 (en) * 2013-05-08 2019-11-19 Sandvik Materials Technology Deutschland Gmbh Conveyor furnace
WO2016125115A1 (en) * 2015-02-06 2016-08-11 Saipem S.P.A. Plant and method for recovering metals and/or metal oxides from industrial process waste, in particular refinery waste
CN107208173A (zh) * 2015-02-06 2017-09-26 塞彭公司 从工业过程废料特别是炼油厂废料中回收金属和/或金属氧化物的设备和方法
US11199360B2 (en) 2015-02-06 2021-12-14 Saipem S.P.A. Plant and method for recovering metals and/or metal oxides from industrial process waste, in particular refinery waste
CN115305349A (zh) * 2022-08-26 2022-11-08 钢研晟华科技股份有限公司 一种减少脱硫脱硝消耗的链篦机回转窑设备
CN115305349B (zh) * 2022-08-26 2024-03-05 钢研晟华科技股份有限公司 一种减少脱硫脱硝消耗的链篦机回转窑设备

Also Published As

Publication number Publication date
CH558924A (de) 1975-02-14
IT998944B (it) 1976-02-20
DE2256034C3 (de) 1975-11-06
GB1421394A (en) 1976-01-14
JPS5629676Y2 (xx) 1981-07-14
AT329429B (de) 1976-05-10
ES420089A1 (es) 1976-06-16
FR2209447A5 (xx) 1974-06-28
DE2256034B2 (de) 1975-03-20
DE2256034A1 (de) 1974-05-22
ATA939973A (de) 1975-07-15
JPS4978728A (xx) 1974-07-30
JPS5394949U (xx) 1978-08-02

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