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WO2009092645A1 - Installation de séchage et de broyage - Google Patents

Installation de séchage et de broyage Download PDF

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Publication number
WO2009092645A1
WO2009092645A1 PCT/EP2009/050309 EP2009050309W WO2009092645A1 WO 2009092645 A1 WO2009092645 A1 WO 2009092645A1 EP 2009050309 W EP2009050309 W EP 2009050309W WO 2009092645 A1 WO2009092645 A1 WO 2009092645A1
Authority
WO
WIPO (PCT)
Prior art keywords
drier crusher
raw material
classifier
drier
duct
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.)
Ceased
Application number
PCT/EP2009/050309
Other languages
English (en)
Inventor
Palle Erik Grydgaard
Richard Eimert
Stig Jensen
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.)
FLSmidth AS
Original Assignee
FLSmidth 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
Application filed by FLSmidth AS filed Critical FLSmidth AS
Publication of WO2009092645A1 publication Critical patent/WO2009092645A1/fr
Anticipated expiration legal-status Critical
Ceased 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 specially adapted for rotary-drum furnaces
    • F27B7/2016—Arrangements of preheating devices for the charge
    • F27B7/2025—Arrangements of preheating devices for the charge consisting of a single string of cyclones
    • 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
    • C04B7/432—Preheating without addition of fuel
    • 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 specially adapted for rotary-drum furnaces
    • 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
    • F27D17/20—Arrangements for treatment or cleaning of waste gases

Definitions

  • the present invention relates to a method for producing cement clinker from raw material in a cement plant by which method hot gases from a kiln system, through an inlet duct, which is connecting the kiln system to a drier crusher, are directed into the drier crusher to which also raw material, via a raw material inlet, is fed in order to be crushed and dried for subsequently, in suspended form, to be carried to a classifier via an outlet duct, which is connecting the drier crusher to the classifier.
  • the invention also relates to a plant for carrying out the invention.
  • a plant as well as a method of the aforementioned kind is well-known in the cement manufacturing industry.
  • the plant described is used in many cement plants around the world where the available cement raw material has a high content of water.
  • Hot gases from a kiln system and raw material, such as chalk, marl and clay, are fed to a drier crusher where the raw material is crushed and dried and subsequently in suspended form carried through a classifier and further to a cyclone in which the raw material is separated from the gases.
  • the separated raw material is introduced into a preheater in the kiln system whereas the gases are carried to a filter for final cleaning.
  • all the hot gases from the preheater are normally transported through the drier crusher.
  • the volume of hot gases used for drying can be increased, i.e. the drying capacity of the system can be increased without causing an increase in the pressure loss across the drier crusher.
  • This increased drying capacity is due to the fact that the raw material is further dried by the bypassed gases while being carried to the classifier.
  • the savings are estimated to not less than 1 kWh/t clinker.
  • the gas flow through the bypass duct is controlled by regulating means which could be a valve or any other kind of suitable means which are able of regulating a gas flow through a duct. In this way it is possible to control the gas flow through the drier crusher in order to maintain the pressure loss across the drier crusher at a predetermined level.
  • the classifier which classifies the raw material into more material fractions, classifies the raw material into at least a fine and a coarse fraction, where the coarse fraction is returned to the drier crusher. Furthermore the classifier may also classify a very coarse fraction which could be directed to a separate grinding installation.
  • the drier crusher is a hammer mill drier, which is particular suitable for processing softer cement raw materials with a high content of water.
  • the shown kiln system 3 in the figure which is not a part of the present invention, is a traditional kiln system 3 comprising a preheater 8, a calciner 9, a rotary kiln 10 and a clinker cooler 11 in which raw materials in known manner are preheated, calcined, burned into cement clinker and cooled.
  • the plant comprises a drier crusher 1 which, via an inlet duct 4, is connected to the preheater 8 in the kiln system 3.
  • the hot gases from the preheater 8 are directed through the inlet duct 4 into the drier crusher 1 wherein raw material, via a raw material inlet 5, also is fed to undergoing crushing and drying prior to, in suspended form, being directed to a classifier 2 through an outlet duct 6 which is connecting the drier crusher 1 to the classifier 2.
  • At least some of the hot gases in the inlet duct 4 are bypassed the drier crusher 1 via a bypass duct 7 which is connecting the inlet duct 4 to the outlet duct 6 at a location between the classifier 2 and the drier crusher 1.
  • the raw material is further dried by the bypassed gases while being carried to the classifier 2 from the drier crusher 1.
  • the raw material is classified into a coarse material fraction, which is returned to the drier crusher 1 for further drying and crushing, and a fine material fraction.
  • the fine material fraction is in suspended form directed to a cyclone 14 in which the raw material is separated from the gases and directed to the preheater 8 or an intermediate storage silo whereas the gases are directed to a filter, not shown, for cleaning.
  • the gas flow through the bypass duct 7 is controlled by a valve 13. In this way it is possible to control the gas flow through the drier crusher 1 in order to maintain the air flow across the drier crusher 1 at a predetermined level.
  • the gas transport through the system is carried out by means of an exhaust gas fan 12 placed at a location after the drier crusher 1. No addition fan between the preheater 8 and the drier crusher 1 is needed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

L'invention concerne un procédé permettant de produire du clinker de ciment à partir de matières premières dans une cimenterie. Selon le procédé, des gaz chauds provenant d'un système de cuisson (3) sont dirigés, via un conduit d'admission (4) qui relie le système de cuisson (3) à un sécheur-broyeur (1), dans le sécheur-broyeur (1) auquel des matières premières sont fournies, vie une entrée de matières premières (5), afin d'être séchées et broyées pour être ensuite transportées, sous forme de suspension, vers un séparateur (2), via un conduit d'évacuation (6), qui relie le sécheur-broyeur (1) au séparateur (2). Le procédé est particulier en ce qu'au moins certains des gaz chauds dans le conduit d'admission (4) sont dérivés du sécheur-broyeur (1), via un conduit de dérivation (7) reliant le conduit d'admission (4) au conduit d'évacuation (6), et dirigés dans le conduit d'évacuation (6) en un endroit situé entre le séparateur (2) et le sécheur-broyeur (1). Ainsi, les matières premières sont encore séchées par les gaz dérivés tout en étant transportées vers le séparateur. De cette manière, le volume des gaz chauds utilisés pour le séchage peut être augmenté, ce qui signifie que la capacité de séchage du système peut être augmentée sans provoquer d'augmentation de la perte de pression dans le sécheur et broyeur.
PCT/EP2009/050309 2008-01-24 2009-01-13 Installation de séchage et de broyage Ceased WO2009092645A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200800091 2008-01-24
DKPA200800091 2008-01-24

Publications (1)

Publication Number Publication Date
WO2009092645A1 true WO2009092645A1 (fr) 2009-07-30

Family

ID=40524611

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/050309 Ceased WO2009092645A1 (fr) 2008-01-24 2009-01-13 Installation de séchage et de broyage

Country Status (1)

Country Link
WO (1) WO2009092645A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102636038A (zh) * 2012-03-30 2012-08-15 中信重工机械股份有限公司 一种旁路放风工艺流程

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007099415A1 (fr) * 2006-02-28 2007-09-07 Flsmidth A/S Procede et installation de sechage et de concassage de matieres premieres minerales humides

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007099415A1 (fr) * 2006-02-28 2007-09-07 Flsmidth A/S Procede et installation de sechage et de concassage de matieres premieres minerales humides

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102636038A (zh) * 2012-03-30 2012-08-15 中信重工机械股份有限公司 一种旁路放风工艺流程

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