EP1706361A2 - Production de clinker de ciment avec extraction d'un flux partiel de gaz d'echappement d'un four rotatif contenant des substances nuisibles - Google Patents

Production de clinker de ciment avec extraction d'un flux partiel de gaz d'echappement d'un four rotatif contenant des substances nuisibles

Info

Publication number
EP1706361A2
EP1706361A2 EP05701035A EP05701035A EP1706361A2 EP 1706361 A2 EP1706361 A2 EP 1706361A2 EP 05701035 A EP05701035 A EP 05701035A EP 05701035 A EP05701035 A EP 05701035A EP 1706361 A2 EP1706361 A2 EP 1706361A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
exhaust
rotary kiln
bypass
cement clinker
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Withdrawn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
EP05701035A
Other languages
German (de)
English (en)
Inventor
Hans-Wilhelm Meyer
Norbert Streit
Carsten Eckert
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.)
KHD Humboldt Wedag AG
Original Assignee
KHD Humboldt Wedag 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 KHD Humboldt Wedag AG filed Critical KHD Humboldt Wedag AG
Publication of EP1706361A2 publication Critical patent/EP1706361A2/fr
Withdrawn legal-status Critical Current

Links

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
    • F27B7/2016—Arrangements of preheating devices for the charge
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/47—Cooling ; Waste heat management
    • 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

Definitions

  • the invention relates to a method for producing cement clinker from raw cement meal, which is preheated in at least one heat exchanger strand through which exhaust gas from a rotary kiln flows and is burned in the sintering zone of the rotary kiln to cement clinker, which is cooled in a downstream cooler, with the deduction of a hot partial stream (bypass gas stream). of the rotary kiln exhaust gas, which is loaded with dust loads and / or gaseous / vaporous pollutants that tend to cake, cooling of the bypass gas stream in a mixing chamber and subsequent separation of pollutant-containing dust from the cooled bypass gas stream.
  • the invention also relates to a plant for carrying out the method.
  • Also known from DE-C-27 24 372 is a cement clinker production line with deduction of a bypass gas stream which, apart from injected water, is cooled in a mixing chamber not with fresh air but with a partial stream of the production exhaust gas or system exhaust gas, which is already in an electrical separator has been cleaned.
  • this partial exhaust gas stream already cleaned in the system filter is again loaded with dust in the mixing chamber of the bypass gas stream, at least this partial exhaust gas stream then having to be cleaned a second time in the separate bypass gas stream dust filter, so that the known cement clinker production with bypass gas extraction has relatively large filter volumes with associated ones high investment and operating costs.
  • bypass problems in cement clinker production are increasing because chlorine- and sulfur-contaminated waste fuels and residues are increasingly used as so-called secondary fuels in western industrialized countries, but also in emerging and developing countries.
  • Many operators of cement clinker production lines therefore try to reduce the circulatory level of volatile components (especially chlorine, sulfur) to an acceptable level by removing the system filter dust.
  • they shy away from installing a separate bypass system which causes considerable investment and operating costs for additional dedusting devices, mostly electrostatic dust separators, dust transport and fans.
  • the bypass mixed gas flows resulting from the supply of large amounts of bypass cooling air are generally so large that they cannot be treated in existing electrostatic dust separators in addition to the already existing amounts of system exhaust gases.
  • the invention has for its object to provide a bypass gas system in a cement clinker production line, which is characterized by particularly low investment and operating costs and is therefore economically advantageous.
  • fresh air is not introduced into the mixing chamber for cooling the bypass gas stream, Rather, at least one withdrawn partial stream of the system exhaust gas already present in the cement clinker production line is introduced into the mixing chamber in the non-dedusted state, ie before dedusting, and used there to cool the bypass gas stream.
  • the system exhaust gas used as the cooling medium for the bypass gas flow can be the exhaust gas from the raw meal heat exchanger strand and / or the existing waste air from the clinker cooler, which is no longer usable in the cement clinker production line itself, and / or the exhaust gases from a heat exchanger strand.
  • Exhaust-operated grinding drying system act.
  • the bypass gas system makes it possible to use the capacity of already existing system filters for the treatment of the bypass gas flow.
  • the amount of exhaust gas to be dedusted increases only insignificantly compared to operation without a bypass system, namely by approximately 3 to 4%, caused only by the increased heat energy supply to the galcinator and the amount of gas from water evaporation.
  • Such a small increase in the total amount of exhaust gas is often within the capacity reserves of the existing filters and exhaust gas fans of a cement clinker production line, or is advantageous compared to a high investment amount due to the acceptance of a slight underperformance.
  • Additional water cooling of the bypass exhaust gases in the mixing chamber of e.g. B. 1250 ° C on z. B. 800 ° C contributes to the reduction of the amount of exhaust gas, the mixing chamber dimension and the fan size.
  • the economical bypass gas system according to the invention of a cement clinker production line for a bypass operation can be implemented in any case up to 10% bypass, ie. H. up to at least up to this order of magnitude of a bypass gas extractor, the capacity of an existing system filter can be used for the treatment of the bypass gas flow, whereby the installation of a separate bypass gas flow dedusting system is not required, as is evident from the numerical example given at the end of the description.
  • Fig. 1 the flow diagram of a cement clinker production line with dedusting of the bypass gas stream via the system filter
  • Fig. 2 the flow diagram of a cement clinker production line with dedusting of the bypass gas stream through the filter of the cement clinker cooler.
  • raw cement meal 10 is placed at the top in raw meal preheater, where it successively passes through the cyclone suspended gas heat exchanger 11, 12, 12, 13, 14 in the combined cocurrent / countercurrent to the hot exhaust gas 15 of a precalcination stage, in the lowest Cyclone 16 is separated from the hot exhaust gas stream 15 and is introduced as high-grade (for example 95%) calcined raw cement meal 17 into the inlet chamber 18 of the rotary kiln 19, in the sintering zone of which it is fired to form cement clinker, which is then in a clinker cooler 20, z. B. grate cooler is cooled. The cooled cement clinker leaves the cooler 20 at 21.
  • the system exhaust gas cooled on the raw cement meal leaves the raw meal preheater at 22 at a temperature of approximately 300 ° C.
  • This exhaust gas is introduced via a suction fan 23 into a spray tower 24, where it is conditioned by water injection with evaporative cooling and cooled to approximately 150 ° C. in a system filter 25, usually electrostatic dust separator freed of dust 26 and then removed via a further exhaust fan 27 as cleaned system exhaust 28 via a main chimney 29.
  • the dust collected in the spray tower 24 and in the system filter 25 is fed via a dust bunker 30 via a delivery line 31 to the cement clinker grinding plant, not shown.
  • the bypass gas stream 32 is cooled in a mixing chamber 33, specifically to a mixed gas 34 of about 400 ° C., the cooling medium in the mixing chamber 33 not being fresh air, but at least a partial flow 35 of the non-dedusted system exhaust gas 22 already present in the cement clinker production line, ie at least a partial flow of the non-dedusted system exhaust gas 22 being used as Cooling medium used for the hot bypass gas stream 32.
  • the temperature of the mixing gases 34 leaving the mixing chamber 33 can be reduced even further, e.g. B. to 300 ° C.
  • the mixed gas stream 34 drawn off from the mixing chamber is also returned to the system exhaust gas upstream of the system filter 25 or the spray tower 24 connected upstream thereof.
  • the bypass gas stream 32 drawn off from the inlet chamber 18 of the rotary kiln 19 is likewise cooled in a mixing chamber 33 at a temperature of approximately 1250 ° C. and dust load also of 200 g / Nm 3
  • the cooling medium being in the mixing chamber 33 is a partial flow 38 of the remaining exhaust air 39 of the clinker cooler 20 which is already no longer usable in the cement clinker production line and which is no longer usable is used.
  • Water 40 is also injected into the mixing chamber 33 as a further medium.
  • the mixed gas stream 34 drawn off from the mixing chamber 33 into the cooler exhaust 39 is likewise fed upstream of the system filter 41, that is, the grate cooler filter.
  • the cleaned grate cooler exhaust air 42 is fed to a chimney 44 via a fan 43, while the dust 45 collected in the cooler filter 41 is also fed to the cement clinker grinding plant.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Treating Waste Gases (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

L'objet de la présente invention est la création, dans une ligne de production de clinker de ciment, d'un système de dérivation de gaz qui se caractérise par des coûts d'investissement et d'exploitation particulièrement bas et qui est donc avantageux sur le plan économique. A cet effet, selon la présente invention, le système de dérivation de gaz est ainsi installé qu'il est possible d'utiliser également la capacité de systèmes de filtrage existants tels que des filtres principaux de gaz d'échappement et / ou des filtres pour l'air de refroidissement sortant pour traiter le flux de gaz de dérivation.
EP05701035A 2004-01-21 2005-01-19 Production de clinker de ciment avec extraction d'un flux partiel de gaz d'echappement d'un four rotatif contenant des substances nuisibles Withdrawn EP1706361A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004003068A DE102004003068A1 (de) 2004-01-21 2004-01-21 Zementklinkerherstellung mit Teilstromabzug schadstoffhaltigen Drehofenabgases
PCT/EP2005/000476 WO2005070845A2 (fr) 2004-01-21 2005-01-19 Production de clinker de ciment avec extraction d'un flux partiel de gaz d'echappement d'un four rotatif contenant des substances nuisibles

Publications (1)

Publication Number Publication Date
EP1706361A2 true EP1706361A2 (fr) 2006-10-04

Family

ID=34744956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05701035A Withdrawn EP1706361A2 (fr) 2004-01-21 2005-01-19 Production de clinker de ciment avec extraction d'un flux partiel de gaz d'echappement d'un four rotatif contenant des substances nuisibles

Country Status (9)

Country Link
US (1) US7296994B2 (fr)
EP (1) EP1706361A2 (fr)
JP (1) JP2007518661A (fr)
CN (1) CN100478294C (fr)
DE (1) DE102004003068A1 (fr)
EG (1) EG24297A (fr)
MX (1) MXPA06008163A (fr)
RU (1) RU2006129935A (fr)
WO (1) WO2005070845A2 (fr)

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ITRM20070277A1 (it) * 2007-05-21 2008-11-22 Magaldi Ind Srl Sistema di estrazione/raffreddamento a secco di ceneri di materiali eterogenei con il controllo del rientro di aria in camera di combustione.
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DE102008036088B4 (de) * 2008-08-04 2012-06-28 Thyssenkrupp Polysius Ag Verfahren zum Betreiben einer Zementanlage
AT507174A1 (de) * 2008-08-14 2010-02-15 Holcim Technology Ltd Verfahren zum aufbereiten von alternativen, kohlenstoffhaltigen, niederkalorischen abfallstoffen für den einsatz in feuerungsanlagen
US7799128B2 (en) 2008-10-10 2010-09-21 Roman Cement, Llc High early strength pozzolan cement blends
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DE102009041089C5 (de) * 2009-09-10 2013-06-27 Khd Humboldt Wedag Gmbh Verfahren und Anlage zur Herstellung von Zement mit verringerter CO2-Emission
CN101832717B (zh) * 2010-04-20 2012-08-08 华南理工大学 一种带独立式省煤器的窑尾余热锅炉及余热回收***
DE102010018046A1 (de) 2010-04-23 2011-10-27 Loesche Gmbh Verfahren zur Vermahlung von Mahlgut
US8414700B2 (en) 2010-07-16 2013-04-09 Roman Cement, Llc Narrow PSD hydraulic cement, cement-SCM blends, and methods for making same
US20120107758A1 (en) * 2010-11-02 2012-05-03 Flsmidth A/S Direct spray cooling for limestone preheaters
US9272953B2 (en) 2010-11-30 2016-03-01 Roman Cement, Llc High early strength cement-SCM blends
DE102011000564B4 (de) * 2011-02-08 2013-05-02 Elex Cemcat Ag Verfahren und Anlage zur Herstellung von Zementklinker
DE102011052561B4 (de) * 2011-05-27 2015-03-05 Südbayerisches Portland-Zementwerk Gebr. Wiesböck & Co. GmbH Verfahren und Vorrichtung zum Brennen von Klinker
PE20142096A1 (es) 2011-10-20 2014-12-06 Roman Cement Llc Mezclas de cemento-scm de particulas empacadas
TWI484125B (zh) 2011-12-23 2015-05-11 Ind Tech Res Inst 迴流懸浮式煅燒爐系統及其使用方法
DE102012110653B3 (de) * 2012-11-07 2014-05-15 Thyssenkrupp Resource Technologies Gmbh Zementherstellungsanlage
AT514267A1 (de) * 2013-04-15 2014-11-15 Holcim Technology Ltd Verfahren und Vorrichtung zur Zementklinkerherstellung
RU2547195C1 (ru) * 2013-09-26 2015-04-10 Государственное унитарное предприятие "Институт нефтехимпереработки Республики Башкортостан" (ГУП "ИНХП РБ") Способ получения портландцементного клинкера (варианты)
CN103557712A (zh) * 2013-11-06 2014-02-05 杨义军 用于新型干法水泥窑余热电站的旁路放风余热回收***
TWI516302B (zh) 2013-12-11 2016-01-11 財團法人工業技術研究院 循環塔二氧化碳捕獲系統、碳酸化爐、煅燒爐及其使用方法
JP6784024B2 (ja) * 2015-12-28 2020-11-11 宇部興産株式会社 抽気装置及び抽気方法
US10737980B2 (en) 2017-01-10 2020-08-11 Roman Cement, Llc Use of mineral fines to reduce clinker content of cementitious compositions
US10131575B2 (en) 2017-01-10 2018-11-20 Roman Cement, Llc Use of quarry fines and/or limestone powder to reduce clinker content of cementitious compositions
US10730805B2 (en) 2017-01-10 2020-08-04 Roman Cement, Llc Use of quarry fines and/or limestone powder to reduce clinker content of cementitious compositions
US11168029B2 (en) 2017-01-10 2021-11-09 Roman Cement, Llc Use of mineral fines to reduce clinker content of cementitious compositions
CN108575090A (zh) * 2017-01-11 2018-09-25 太平洋工程株式会社 水泥窑排气的汞减少方法及其装置
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Also Published As

Publication number Publication date
CN1953944A (zh) 2007-04-25
JP2007518661A (ja) 2007-07-12
CN100478294C (zh) 2009-04-15
US7296994B2 (en) 2007-11-20
EG24297A (en) 2009-01-12
MXPA06008163A (es) 2007-01-30
DE102004003068A1 (de) 2005-08-11
US20070178418A1 (en) 2007-08-02
WO2005070845A2 (fr) 2005-08-04
RU2006129935A (ru) 2008-02-27
WO2005070845A3 (fr) 2006-01-05

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