WO2010124702A1 - Procédé et dispositif pour la préparation du combustible dans un processus de cuisson de clinkers - Google Patents

Procédé et dispositif pour la préparation du combustible dans un processus de cuisson de clinkers Download PDF

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Publication number
WO2010124702A1
WO2010124702A1 PCT/EP2009/003145 EP2009003145W WO2010124702A1 WO 2010124702 A1 WO2010124702 A1 WO 2010124702A1 EP 2009003145 W EP2009003145 W EP 2009003145W WO 2010124702 A1 WO2010124702 A1 WO 2010124702A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
drying gas
heat exchanger
cooler
drying
Prior art date
Application number
PCT/EP2009/003145
Other languages
German (de)
English (en)
Inventor
Johann Trenkwalder
Original Assignee
Schwenk Zement 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 Schwenk Zement Kg filed Critical Schwenk Zement Kg
Priority to PCT/EP2009/003145 priority Critical patent/WO2010124702A1/fr
Publication of WO2010124702A1 publication Critical patent/WO2010124702A1/fr

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Classifications

    • 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
    • C04B7/44—Burning; Melting
    • C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
    • 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
    • C04B7/44—Burning; Melting
    • C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
    • C04B7/4423—Waste or refuse used as 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 peculiar to rotary-drum furnaces
    • 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
    • F27B7/38—Arrangements of cooling devices
    • 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
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y02P40/125—Fuels from renewable energy sources, e.g. waste or biomass

Definitions

  • the invention relates to a process for fuel treatment in the cement clinker firing process in which a moisture-laden fuel is dried in a fuel dryer with a preferably preheated drying gas, and a device designed to carry out such processes.
  • the production of cements comprises, in addition to the recovery and processing of the starting materials, the firing thereof into cement clinker as well as the joint grinding of this burned clinker with gypsum and, if appropriate, other admixtures to form cement.
  • rotary kilns are used.
  • a multi-stage countercurrent process is operated with a rotary kiln as a central process stage.
  • the starting material is heated up to the partial melt in the area of the rotary kiln firing and the formation of the clinker phases is made possible by this sintering.
  • the rotary kiln is usually preceded by a Zyklonvormaschinermstrom whose construction depends on the desired Preparation of the starting material is executed.
  • the Zyklonvorierrmstrom on the one hand the preheated raw material and on the other hand fed in countercurrent to the exhaust air from the rotary kiln.
  • a calcination stage is arranged in newer designs between preheater and rotary kiln, in which the calcium carbonate of the preheated with Zyklonvor maybermstrom Brenngut is already largely deacidified before entering the rotary kiln. The necessary energy can be supplied to the calciner via an additional firing.
  • secondary fuels of lower quality such as sewage sludge or the like
  • These secondary fuels usually have a high moisture content and should be dried prior to combustion in order to increase the overall efficiency of the rotary kiln plant.
  • fresh air is sucked in conventional drying systems and possibly preheated.
  • gaseous emissions such as odors, organic C-compounds od.
  • the invention has for its object to provide a method for fuel processing in the cement clinker burning process available, which is easy to carry out without environmental pollution.
  • this object is achieved by a development of the known method, which is characterized essentially in that the drying gas introduced into a one used for the cement clinker burning process rotary kiln clinker cooler and to a temperature of 500 0 C or more, esp. 700 0 C or more, more preferably 800 0 C or more, is heated.
  • the drying gas enriched gaseous emissions, such as odors, organic C-compounds od. Like., Are completely decomposed.
  • At least one blower for sucking and blowing in the humidified drying gas is placed in the recuperation zone of the clinker cooler.
  • a static grate is usually mounted, in the direction of flow of the clinker the first movable grate of the clinker Clinker cooler follows.
  • combustion air preheating for the clinker burning process is primarily carried out in this region of the grate cooler.
  • the drying gas cooled and moistened by the drying process before being introduced into the clinker cooler to a minimum of 10 0 C, preferably at least 20 0 C, more preferably 30 0 C or more, above the dew point of the moistened Drying gas temperature is warmed up.
  • heating of the humidified drying gas ensures that no moisture condensed from the drying gas and this drying gas can be further treated in the rotary kiln plant, without reacting to any appreciable extent with the fired cement clinker. Further, by warming up the drying gas, the intake air temperature of the grate cooler fan increases.
  • the communicated to the furnace system combustion air is thus available at a higher temperature, so that the proposed in the invention to facilitate the disposal of the drying gas preheating also contributes to energy savings in the clinker burning process. As a result, the energy consumption associated with the preheating can for the most part be used profitably for the clinker burning process.
  • the heated drying gas may be subjected to a treatment process, such as a filtering process, prior to introduction into the clinker cooler.
  • This treatment esp. Filtering primarily serves the dedusting and can be designed accordingly simple. A reduction of gaseous emissions, such as odors, organic C compounds od.
  • a treatment process such as a filtering process
  • the drying gas can be supplied to the fuel dryer via a fresh air intake.
  • the drying gas for preheating to go through one, two or more preferably arranged in the fuel dryer heat exchanger.
  • the drying gas emitted in the clinker cooler from the fired cement clinker energy can be used profitably, if the heat exchanger with a heated by means of extracted from the clinker cooler exhaust air fluid, such as a thermal oil is charged. This fluid, in turn, can be heated in a heat exchanger charged with the cooler exhaust air.
  • the preheating of the cooler exhaust air via a first heat exchanger to the preferably executed as thermal oil fluid and then from the fluid via one or more arranged in the fuel dryer heat exchanger on the example.
  • thermal oil can be conveyed through lines with a relatively small cross-section to the fuel dryer.
  • the radiator exhaust air must be conveyed only over a relatively short distance through pipelines with a large cross-section to the heating of the thermal oil serving heat exchanger. As a result, the overall investment required for the devices used to carry out the method according to the invention is reduced.
  • the warming of the moistened drying gas provided according to the invention can also take place in a heat exchanger arranged downstream of the fuel dryer, wherein this warming up process can also be effected with the fluid heated with the cooler exhaust air, which is fed to the downstream heat exchanger for heating the drying gas.
  • the cooler exhaust air taken from the clinker cooler is usually used to preheat the raw meal to be supplied to the cyclone preheating system.
  • the clinker cooler can be connected via a corresponding cooler exhaust air line with a raw meal preheating.
  • a part of the cooler exhaust air can be performed in carrying out inventive method via a bypass line connected via two branch points with the cooler exhaust main line.
  • the proportion of the outgoing air guided via the bypass line can be set to a value in the range from 10 to 100% of the total radiator exhaust air as a function of the exhaust air temperature, the exhaust air quantity and the desired flow temperature of the fluid.
  • the bypass line and / or from the bypass line bridged section of the radiator exhaust air duct arranged corresponding throttle are in the bypass line and / or from the bypass line bridged section of the radiator exhaust air duct arranged corresponding throttle. Additionally or alternatively, it can also be thought to introduce fresh air into the bypass line for adjusting the exhaust air temperature.
  • the bypass line can be arranged on the one hand with the cooler exhaust air and on the other hand serving for heating the fluid heat exchanger. It has proved to be favorable in terms of obtaining a particularly high efficiency when the fluid in the heat exchanger by at least 30 0 C, preferably 40 0 C or more, esp. 50 0 C or more, is heated. If a thermal oil is used as the fluid, this thermal oil in the arranged in the bypass line heat exchanger from a temperature of about 120 to 140 0 C, esp. About 130 0 C, to a temperature of about 170 to 190 0 C, esp 180 0 C, to be heated.
  • the cooler exhaust air is in the heat exchanger in view of obtaining a particularly high efficiency advantageously by 50 ° C or more, esp. 80 0 C or more and cooled.
  • the cooler exhaust air from a temperature in the range of 200 to 300 0 C, esp. About 250 0 C, to a temperature in the range of 140 to 200 0 C, esp. About 170 0 C, cooled.
  • a device suitable for carrying out a method according to the invention comprises a fuel dryer operable to dry a fuel with a preferably preheated drying gas and one for introducing the drying gas from the fuel dryer into a clinker cooler connected downstream of a rotary kiln, esp the recuperation zone of the clinker cooler, designed line arrangement.
  • a device for fuel treatment in the cement clinker burning process is provided with a fuel dryer for drying the fuel with a preferably preheated drying fuel dryer, wherein the fuel dryer, a warm-up device, such as a heat exchanger is connected downstream, for warming up the by the drying process, if necessary, cooled and humidified drying gas to a temperature above the dew point of the drying gas.
  • a treatment arrangement in particular a filter arrangement designed for cleaning the drying gas, such as a filter arrangement designed for dedusting the drying gas, can be arranged.
  • the treatment arrangement may also have a condensation arrangement, so as to avoid the introduction of an excessively large amount of water in the clinker cooler.
  • the drying gas in the heat exchanger downstream of the fuel dryer by a temperature of 10 0 C, preferably at least 20 0 C, more preferably at least 30 ° C, from a temperature in the range of 30 to 60 0 C, esp. About 45 0 C, to a temperature in the range from 60 to 80 0 C, esp. About 70 0 C 1 is warmed up.
  • the fuel dryer may have at least one heat exchanger to which the drying gas and, on the other hand, a heated fluid, such as a thermal oil, heated with the aid of cooler exhaust air drawn from the clinker cooler, can be supplied.
  • a heated fluid such as a thermal oil
  • a heat exchanger which can be charged with the cooler exhaust air can be used, the further heat exchanger being expediently arranged in a bypass line to a cooler exhaust line connecting the clinker cooler with a preheating system, in particular a raw meal preheating system, connected upstream of the rotary kiln.
  • the device shown in the drawing comprises as a central part of a rotary kiln 10.
  • the rotary kiln 10 is fed via a Zyklonvoricarmstrom 20 with a grinding device 22 crushed raw meal.
  • the cement clinker fired from the raw meal in the rotary kiln 10 is cooled in a clinker cooler designated as a whole by 30.
  • the clinker cooler 30 is supplied via cooling fan 32, 92 cooling air. Part of this cooling air is preheated in the clinker cooler 30 and fed via a vent line 40 to a raw meal processing device 22, such as a grinder.
  • Another part of the cooling air is introduced from the recuperation zone of the clinker cooler as combustion air or secondary air in the rotary kiln.
  • a fuel dryer 60 For processing the fuel required for the clinker burning process, a fuel dryer 60 is provided. hen.
  • the fuel dryer 60 is designed as a belt dryer and comprises a conveyor belt 61 to which moisture-laden fuel, such as sewage sludge, is supplied.
  • the fuel may have a moisture content of 20% or more.
  • the fuel dryer 60 For drying the fuel to a moisture content of 5% or less, the fuel dryer 60 is supplied with fresh air. This fresh air is preheated by means of one, two, three or more heat exchangers 62 arranged in the fuel dryer 60.
  • the heat exchangers 62 are fed via a line system 52 with a fluid realized as thermal oil. This fluid is heated with a arranged in a bypass line 46 to the exhaust pipe 40 heat exchanger 50.
  • the bypass line 46 is connected via branching points 42 and 44 with the exhaust air line 40 for the deducted from the clinker cooler 30 radiator exhaust air. It comprises two throttle valves 43 and a fan 45.
  • a throttle valve 48 is also provided in the section of the cooler exhaust line bridged by the bypass line 46. Further, a fresh air supply line 47 for supplying fresh air is provided in the cooler exhaust air line. Also in the Frischluftzutelltechnisch 47, a throttle valve 49 is arranged for adjusting the amount of fresh air.
  • the amount of cooler exhaust discharged through the bypass line 46 may be up to 100% of the total exhaust air drawn from the clinker cooler 30 through the cooler exhaust line.
  • the amount of diverted into the bypass line 46 radiator exhaust air can be adjusted depending on the moisture content of the fuel to be dried and the necessary heat extraction.
  • the cooler exhaust air from a temperature in the order of 200 to 300 0 C, esp. About 250 ° C, to a temperature in the range of 150 to 200 0 C, esp. 170 0 C, cooled.
  • the thermal oil supplied to the heat exchanger 50 via the line system 52 from a temperature in the range of 100 to 150 0 C, esp. About 130 0 C, to a temperature of 150 to 200 0 C, esp. 180 ° C, heated.
  • the thus preheated thermal oil is supplied to the heat exchangers 62, with which the sucked fresh air is warmed up for the purpose of fuel drying.
  • the withdrawn from the fuel dryer 60 drying air is heated by means of another, the fuel dryer 60 downstream heat exchanger 70. It can be assumed that the drying air leaves the fuel dryer 60 with a temperature in the range of 30 to 60 0 C, esp. About 45 0 C, and in the heat exchanger 70 to at least 10 0 C, preferably at least 20 0 C, especially preferably about 25 0 C, above the dew point of the humidified during the drying process air is warmed.
  • the drying air After leaving the heat exchanger 70, the drying air at a temperature in the range of 50 to 90 0 C, esp. About 70 0 C 1 on.
  • the thus heated drying air passes through a treatment arrangement 80, such as a filter arrangement used for dedusting the drying air and / or serving for dehumidifying the drying air condensation arrangement, and is introduced via a line system 90 and radiator fan 92 in the clinker cooler 30.
  • a treatment arrangement 80 such as a filter arrangement used for dedusting the drying air and / or serving for dehumidifying the drying air condensation arrangement
  • the introduction of the heated drying air takes place in the region of the static grate or the grate 1, ie in the recuperation zone of the clinker cooler 30.
  • the drying air is at a temperature of 500 0 C or more, esp.
  • the line assembly 90 can also be supplied with fresh air via a fresh air flap 94.
  • the introduction of the warmed-up drying air takes place in a region of the clinker cooler 30 in which, above all, combustion air preheating for the clinker burning process is to be ensured.
  • the intake temperature of the supplied air increases.
  • the combustion air passed to the furnace system is then available at an elevated temperature.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un procédé de préparation du combustible dans un processus de cuisson de clinkers, procédé selon lequel un combustible chargé humide dans un sécheur de combustible, est séché au moyen d'un gaz de séchage, de préférence préchauffé, caractérisé en ce que le gaz de séchage est introduit dans un refroidisseur de clinkers, monté en aval d'un four rotatif utilisé pour le processus de cuisson de clinkers, et est porté à une température égale ou supérieure à 500°C, en particulier égale ou supérieure à 700°C, de préférence, égale ou supérieure à 800°C. Le préchauffage du gaz de séchage s'effectue indirectement au moyen d'un fluide, par exemple d'une huile thermique.
PCT/EP2009/003145 2009-04-30 2009-04-30 Procédé et dispositif pour la préparation du combustible dans un processus de cuisson de clinkers WO2010124702A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/003145 WO2010124702A1 (fr) 2009-04-30 2009-04-30 Procédé et dispositif pour la préparation du combustible dans un processus de cuisson de clinkers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/003145 WO2010124702A1 (fr) 2009-04-30 2009-04-30 Procédé et dispositif pour la préparation du combustible dans un processus de cuisson de clinkers

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WO2010124702A1 true WO2010124702A1 (fr) 2010-11-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011001773A1 (de) 2011-04-04 2012-10-04 Thyssenkrupp Polysius Ag Verfahren und Anlage zur Herstellung von Zementklinker
DE102013105096A1 (de) 2013-05-17 2014-11-20 Thyssenkrupp Industrial Solutions Ag Verfahren zur Wärmebehandlung eines Materialstroms und zur Trocknung eines kohlenstoffhaltigen Stoffstroms

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533775A1 (de) * 1985-09-21 1987-03-26 Dyckerhoff Eng Gmbh Verfahren und vorrichtung zur verwertung heizwerthaltiger abfallstoffe in verbindung mit der herstellung von bindemitteln
DE3537595A1 (de) * 1985-10-23 1987-04-23 Alexander Grisar Verfahren und anlage zur verwertung von feuchten abfaellen, insbesondere klaerschlamm
DE3542004A1 (de) * 1985-11-28 1987-06-04 Kloeckner Humboldt Deutz Ag Trocknung und verbrennung von schlaemmen beim brennprozess mineralischer stoffe
EP0488989A1 (fr) * 1990-11-30 1992-06-03 WOPFINGER Stein- und Kalkwerke Schmid & Co. Procédé pour la fabrication de clinker de ciment
WO1994029231A1 (fr) * 1993-06-03 1994-12-22 F.L. Smidth & Co. A/S Procede et installation de fabrication de clinker de ciment
TW470840B (en) * 2000-02-08 2002-01-01 Green Island Environmental Tec A process for co-combustion integrating the production of cement and the incineration of municipal solid
US20050274067A1 (en) * 2004-06-14 2005-12-15 Morton Edward L Method and apparatus for drying wet bio-solids using excess heat from a cement clinker cooler
WO2008032160A2 (fr) * 2006-09-14 2008-03-20 Holcim Technology Ltd. Procédé de prétraitement de charges contaminées avec des porteurs de carbone

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533775A1 (de) * 1985-09-21 1987-03-26 Dyckerhoff Eng Gmbh Verfahren und vorrichtung zur verwertung heizwerthaltiger abfallstoffe in verbindung mit der herstellung von bindemitteln
DE3537595A1 (de) * 1985-10-23 1987-04-23 Alexander Grisar Verfahren und anlage zur verwertung von feuchten abfaellen, insbesondere klaerschlamm
DE3542004A1 (de) * 1985-11-28 1987-06-04 Kloeckner Humboldt Deutz Ag Trocknung und verbrennung von schlaemmen beim brennprozess mineralischer stoffe
EP0488989A1 (fr) * 1990-11-30 1992-06-03 WOPFINGER Stein- und Kalkwerke Schmid & Co. Procédé pour la fabrication de clinker de ciment
WO1994029231A1 (fr) * 1993-06-03 1994-12-22 F.L. Smidth & Co. A/S Procede et installation de fabrication de clinker de ciment
TW470840B (en) * 2000-02-08 2002-01-01 Green Island Environmental Tec A process for co-combustion integrating the production of cement and the incineration of municipal solid
US20050274067A1 (en) * 2004-06-14 2005-12-15 Morton Edward L Method and apparatus for drying wet bio-solids using excess heat from a cement clinker cooler
WO2008032160A2 (fr) * 2006-09-14 2008-03-20 Holcim Technology Ltd. Procédé de prétraitement de charges contaminées avec des porteurs de carbone

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 20032, Derwent World Patents Index; AN 2003-027726, XP002345776 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011001773A1 (de) 2011-04-04 2012-10-04 Thyssenkrupp Polysius Ag Verfahren und Anlage zur Herstellung von Zementklinker
EP2508494A1 (fr) 2011-04-04 2012-10-10 ThyssenKrupp Polysius AG Procédé et installation destinés à la fabrication de clinker de ciment
CN102730997A (zh) * 2011-04-04 2012-10-17 蒂森克虏伯伯利休斯股份有限公司 生产水泥熟料的方法和设备
US9067827B2 (en) 2011-04-04 2015-06-30 Thyssenkrupp Industrial Solutions Ag Method and installation for producing cement clinker
CN102730997B (zh) * 2011-04-04 2016-09-07 蒂森克鲁伯工业方案股份公司 生产水泥熟料的方法和设备
DE102013105096A1 (de) 2013-05-17 2014-11-20 Thyssenkrupp Industrial Solutions Ag Verfahren zur Wärmebehandlung eines Materialstroms und zur Trocknung eines kohlenstoffhaltigen Stoffstroms

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