WO2022074552A1 - Procédé et système de manipulation de gaz de dérivation dans un circuit de four à ciment - Google Patents

Procédé et système de manipulation de gaz de dérivation dans un circuit de four à ciment Download PDF

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Publication number
WO2022074552A1
WO2022074552A1 PCT/IB2021/059116 IB2021059116W WO2022074552A1 WO 2022074552 A1 WO2022074552 A1 WO 2022074552A1 IB 2021059116 W IB2021059116 W IB 2021059116W WO 2022074552 A1 WO2022074552 A1 WO 2022074552A1
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WO
WIPO (PCT)
Prior art keywords
bypass
gas
cyclone
bypass gas
kiln
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Application number
PCT/IB2021/059116
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English (en)
Inventor
Peter RYDENG
Original Assignee
Flsmidth A/S
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 A/S filed Critical Flsmidth A/S
Publication of WO2022074552A1 publication Critical patent/WO2022074552A1/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
    • C04B7/47—Cooling ; Waste heat management
    • C04B7/475—Cooling ; Waste heat management using the waste heat, e.g. of the cooled clinker, in an other way than by simple heat exchange in the cement production line, e.g. for generating steam
    • 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
    • Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods

Definitions

  • the invention relates to a bypass system for bypass gas handling in a cement kiln system in a plant for manufacture of cement clinker.
  • the cement kiln for the manufacture of cement clinker comprises a preheater, a rotary kiln and a clinker cooler.
  • a calciner with hot air duct from the cooler may be inserted between kiln and preheater.
  • the bypass system typically extracts a part of the combustion gas from the gas exit of the rotary kiln through a duct.
  • the input of alkali chlorides and the likes to a kiln system comes from either the raw materials or the fuels.
  • Limestone deposits may have been geologically exposed to sea water and some fuels may contain chlorides from waste materials. From a certain input level, the alkali chlorides will accumulate in the kiln system causing buildups, clogging and unstable operation and therefore require a bypass system to purge the alkali chlorides from the kiln system to control the chloride accumulation at a safe level to stabilize operation and minimize corrosion.
  • the alkali chlorides accumulate in the kiln inlet region.
  • the salts are evaporated in the kiln and carried by the gas flow to the preheater where it condenses on the colder surface of the preheated raw meal and circulates back to the kiln.
  • the kiln inlet is the most favorable location to purge a part of the combustion gas, the kiln gas contains the highest concentration of gaseous alkali chlorides with a relatively low kiln dust content.
  • bypass gas purged combustion gas
  • the bypass gas physically bypassed the preheater or a part of the preheater to avoid condensation of alkali chloride salts on the preheated raw meal thus adopting the name “preheater bypass”.
  • the term “bypass” later came to cover a system where purged combustion gas is quenched with air injection and dedusted by separation with a cyclone or filter removing the bypass dust, containing the alkali chlorides and returning the gas to a suitable point in or after the preheater by a separate fan.
  • bypass While maintaining the term “bypass” the practice has been supplemented by systems taking the cooled and filtered bypass gas to a separate exhaust system as shown in figure 6 illustrating a kiln system with a frequently used version of the conventional bypass system.
  • the conventional bypass method in figure 6 extracts a part of the kiln combustion gas through a duct connection and quenching the bypass gas from about 1 150°C to 400°C using about 2,5 kg ambient air/kg bypass gas in a quench chamber to condense(sublimate) the alkali chlorides to a dust. Additional cooling by mixing more ambient air or water spray to reach about 200°C is required when using a bag filter to collect the bypass dust.
  • the conventional method of using ambient air mixing to cool the bypass gas leads to a substantial dilution and volume increase of the bypass gas, requiring conditioning/treatment of 3 to 4 times more gas using larger equipment at higher cost.
  • the dilution also makes the return of the larger volume of dedusted bypass gas back to the process less favorable as the dilution air acts as false air affecting production loss, heat loss and power consumption of the operation.
  • the cooled and dedusted bypass gas may also contain pollutants from the combustion fumes such as NOx and SOx along with other potential emissions such as CO, TOC, HCI, Dioxin/Furans which need to be checked and controlled before emission to protect the environment.
  • the invention relates to a bypass system for bypass gas handling in a cement kiln system in a plant for manufacture of cement clinker, said plant for manufacture of cement clinker preferably comprising
  • said bypass system preferably comprises i. a duct connection to extract bypass gas
  • a quench chamber to quench the bypass gas
  • a heat exchanger to cool the quenched bypass gas
  • a recirculation fan to recirculate a fraction of or all the cooled bypass gas back to the quench chamber
  • at least one cyclone placed in a recirculation circuit to separate a part of the bypass dust for removal from the recirculation circuit
  • one or more tapping points to remove recirculating gas from the recirculation circuit, wherein the bypass gas is quenched in the quench chamber and further cooled with a heat exchanger and then recirculated to the quench chamber to be used as quench coolant to reduce or avoid the use of ambient air as coolant forming a bypass recirculation circuit.
  • the heat exchanger is used to cool the bypass gas thereby reducing or avoiding the use of ambient air for quenching and enabling the reuse of cooled bypass gas as coolant to quench the hot bypass gas in the quench chamber. Reducing or avoiding the dilution with ambient air reduces the gas quantity to be tapped from the recirculation circuit which may be returned to the process with less impact on the process and with lower handling cost.
  • the cyclone in the bypass recirculation circuit may be replaced with a dust settling chamber or an electrostatic precipitator or a filter to remove bypass dust. While the cyclone may have lower efficiency at low flows it can be replaced with an electrostatic precipitator or filter to remove dust.
  • the heat exchanger and fan are preferably operated to cool the quenched gas to a temperature between 150-350°C.
  • the bypass gas is preferably extracted from the rotary kiln combustion gases before any meal addition to the gases.
  • the bypass gas is extracted from outlet gas of a bottom stage cyclone or parallel cyclone.
  • a bypass system extracting kiln combustion gases may be combined with a bypass system extracting bypass gas from outlet gas of a bottom stage cyclone or parallel cyclone.
  • a tapping point of the bypass recirculation circuit is preferably arranged in the flow direction after the quench chamber and before the heat exchanger and returning the tapped bypass gas, which is partially dedusted and cooled without a substantial addition of ambient air, with a fan to a location adjacent to the extraction point and thereby also returning the pollutants such as NOx and SOx back to the kiln system.
  • a tapping point of the bypass recirculation circuit is located in the flow direction after the heat exchanger and before the quenching chamber and passing the tapped bypass gas, which is partially dedusted and cooled without a substantial addition of ambient air:
  • the two tapping points differ essentially in the temperature of the gas tapped from the recirculation circuit and the selection of tapping point to benefit the subsequent use and handling of the tapped bypass gas. More heat may be preserved by returning gas from a hot tapping point. If equipment for handling the tapped gas requires lower temperatures the colder tapping point is used.
  • the invention also relates to a bypass system for bypass gas handling in a cement kiln system in a plant for manufacture of cement clinker, said plant for manufacture of cement clinker preferably comprising a preheater, a kiln, a clinker cooler, said bypass system preferably comprises
  • a quench chamber to quench the bypass gas, ill. additional cooling to 150-350°C, iv. a filter, electrostatic precipitator or cyclone for removal of dust, wherein the bypass gas is quenched in the quench chamber and further cooled before being dedusted by a filter to be exhausted or dedusted by a cyclone to be returned to the preheater or cooler.
  • the quench chamber may be connected to the gas outlet of a bottom stage cyclone or an inserted cyclone connected to the gas outlet of a bottom stage cyclone to extract bypass gas from the cyclone gas outlet to remove a bypass gas with a low content of kiln dust.
  • a calciner may in all cases be arranged between the kiln and preheater while receiving recuperated hot air from the clinker cooler as tertiary air for combustion by a duct connection.
  • the invention relates to a method for bypass gas handling in a cement kiln system in a plant for manufacture of cement clinker, said method comprising the steps of extracting bypass gas from a kiln system, quenching the bypass gas in a quench chamber cooling the quenched bypass gas in a heat exchanger, recirculating the cooled bypass gas back to the quench chamber with a recirculation fan, separating a part of the bypass dust for removal from a recirculation circuit with at least one cyclone or an electrostatic precipitator being placed in the recirculation circuit, and removing recirculating gas from the recirculation circuit via one or more tapping points with a fan controlling the bypassed quantity, wherein the bypass gas is preferably quenched in the quench chamber and further cooled with a heat exchanger and then recirculated to the quench chamber to be used as quench coolant with a recirculation fan forming a bypass recirculation circuit which is dedusted by a cyclone
  • the method may further comprise the steps of extracting bypass gas from the gas outlet of a bottom stage cyclone, quenching the bypass gas in a quench chamber cooling the quenched bypass gas, dedusting the cooled bypass gas with a cyclone or an electrostatic precipitator or a filter, and a fan wherein the bypass gas taken from the gas outlet of a bottom stage cyclone is preferably quenched in a quenching chamber, further cooled and then dedusted with a cyclone or an electrostatic precipitator or in a filter by the draught of a fan.
  • FIGURE 1 schematically illustrates a bypass recirculation circuit with heat exchanger according to the present invention.
  • FIGURE 2 schematically illustrates a kiln system for the manufacture of cement clinker with a bypass system using the bypass recirculation circuit with heat exchanger.
  • FIGURE 3 schematically illustrates 4 different embodiments of the recirculation circuit with a heat exchanger according to present invention.
  • A Schematically illustrates the circuit with a hot tapping point and cyclone for partial removal of dust at 200 °C placed after heat exchanger.
  • B Schematically illustrates the circuit with a hot tapping point and cyclone for partial removal of dust at 400 °C placed before the heat exchanger.
  • FIGURE 4 schematically illustrates a kiln system for the manufacture of cement clinker with a bottom stage bypass using a recirculation circuit with heat exchanger according to the present invention.
  • FIGURE 5 schematically illustrates a bottom stage cyclone combined with a coaxially placed quench chamber taking bypass gas from the center of the tangential cyclone outlet.
  • FIGURE 6 schematically illustrates a conventional bypass system mixing ambient air in the quench chamber and again before the filter to control the operating temperature of the bypass dust filter.
  • the present invention comprises a new system and method to cool the hot combustion gases bypassed from the kiln system to purge the accumulated alkali chlorides and the likes from the kiln system.
  • FIG 1 schematically illustrates a preferred embodiment of the bypass system according to the present invention.
  • the bypass system according to the present invention is schematically being illustrated when arranged in a cement kiln system in a plant for manufacture of cement clinker.
  • the plant for manufacture of cement clinker comprises a preheater 1 , a kiln 3, and a clinker cooler 4.
  • the bypass system 6 comprises: i. a duct connection 60 to extract bypass gas,
  • a quench chamber 61 to quench the bypass gas
  • a heat exchanger 63 to cool the quenched bypass gas
  • a recirculation fan 68 to recirculate a fraction of or all the cooled bypass gas back to the quench chamber 61
  • a cyclone 65 placed in the recirculation circuit to separate a part of the bypass dust for removal from the recirculation circuit
  • a tapping point 69 to remove recirculating gas from the recirculation circuit, wherein the bypass gas is quenched in the quench chamber and further cooled with a heat exchanger and then recirculated to the quench chamber to be used as quench coolant to reduce or avoid the use of ambient air as quench coolant forming a bypass recirculation circuit.
  • the cyclone 65 in the bypass recirculation circuit may be replaced or supplemented with a dust settling chamber, an electrostatic precipitator (not illustrated in figure 2) or filter to remove bypass dust.
  • the cyclone separation efficiency depends on the gas flow. With a low gas flow, the electrostatic precipitator may be more favorable for the efficiency.
  • the heat exchanger 63 and fan 68 are operated to cool the quenched gas to a temperature between 150-350°C.
  • the bypass gas is preferably extracted from the rotary kiln combustion gases via a duct connection 60 before any meal addition to the gases.
  • the bypass is extracted from gas outlet of a bottom stage cyclone or parallel cyclone.
  • FIG. 3 schematically illustrates embodiments of hot and cold tapping points:
  • a hot tapping point 69 (A and B in figure 3) of the bypass recirculation circuit is arranged in flow direction after the quench chamber 61 and before the heat exchanger 63 and may preferably return the tapped bypass gas, which is partially dedusted and cooled without a substantial addition of ambient air, with a fan 70 to a location 71 adjacent to the extraction point and thereby also returning the polluting gases such as NOx and SOx to the kiln system.
  • a cold tapping point 69 (C and D in figure 3) of the bypass recirculation circuit is arranged in flow direction after the heat exchanger 63 and before the quenching chamber 61 and passing the tapped bypass gas, which is partially dedusted and cooled without a substantial addition of ambient air: i. through a suitable filter with a fan before being exhausted or
  • a calciner 2 may be arranged between the kiln 3 and preheater 1 and receiving recuperated hot air from the clinker cooler 4 as tertiary air by duct connection 21 .
  • the invention in a second aspect relates to a method for bypass gas handling in a cement kiln system in a plant for manufacture of cement clinker.
  • the method comprises the steps of extracting bypass gas from a kiln system, quenching the bypass gas in a quench chamber 61 , cooling the quenched bypass gas in a heat exchanger 63, recirculating the cooled bypass gas back to the quench chamber 61 with a recirculation fan 68, separating a part of the bypass dust for removal from the recirculation circuit with at least one cyclone 65 or an electrostatic precipitator being placed in the recirculation circuit, and removing recirculating gas from the recirculation circuit via one or more tapping points 69 with a fan 70 controlling the bypassed quantity, wherein the bypass gas is quenched in the quench chamber and further cooled with a heat exchanger and then recirculated to the quench chamber to be used as quench coolant with a recirculation fan 68 forming a bypass
  • the method may further comprise the steps of extracting bypass gas from the gas outlet of a bottom stage cyclone 1 e, quenching the bypass gas in a quench chamber 61 , cooling the quenched bypass gas, dedusting the cooled bypass gas with a cyclone or an electrostatic precipitator or a filter, and a fan 68, wherein the bypass gas taken from the gas outlet of a bottom stage cyclone is quenched in a quenching chamber, further cooled and then dedusted with a cyclone or an electrostatic precipitator or in a filter by the draught of a fan.
  • the claimed new bypass system and method introduces a heat exchanger 63 with the purpose of cooling the quenched bypass gas to a minimum temperature avoiding acid condensation and suitable to be reused as coolant in the quench chamber 61 in a bypass recirculation circuit.
  • the reuse of the cooled bypass gas for quenching replaces the use ambient air thereby avoiding the significant air dilution characteristic of the conventional bypass systems used to quench and condition the bypass gas for filtering in an ordinary bag filter.
  • the bypass recirculation circuit will contain one or more cyclones and/or an electrostatic precipitator and/or a filter with placement suitably before and/or after the heat exchanger to reduce/remove the amount of recirculating dust.
  • the entry of combustion gas into the circuit is controlled by tapping a corresponding amount of recirculating bypass gas from the circuit.
  • the recirculation circuit provides an easy and safe control of the bypass system loop as the bypass quantity is controlled directly by the gas quantity removed from the recirculation circuit and the cooling in the heat exchanger is controlled by air cooling fans regulated to obtain the desired temperature of the cooled bypass gas suitable as quench gas.
  • bypass gas Avoiding the substantial dilution of the bypass gases significantly improves the possibilities to implement sustainable solutions to treat the bypass gas.
  • the reduced quantity of undiluted and partially dedusted bypass gas can be returned to the kiln system without adding significant amounts of ambient air. Adding ambient air into the kiln system is similar to allowing false air to impact negatively on production level, specific heat loss, specific power consumption as the false cold air replaces the use of recuperated hot air from the cooler 4.
  • the invention will aim to reduce the entry of ambient air to a minimum needed for cleaning purposes and a small amount of unavoidable false air.
  • bypass gas is extracted from the rotary kiln 3 inlet area then quenched with ambient air mixing resulting in an amount of cooled gas significantly higher before returning the gas to the calciner 2 or into a gas flow leading to the calciner 2 to use the heated ambient air to support combustion in the calciner 2.
  • the invention recirculates a fraction or all the quenched bypass gas in a recirculating circuit which is cooled with a heat exchanger 63 and dedusted to reuse the gas as coolant in the quench chamber. No substantial amount of ambient cooling air is mixed into the process. A part of the recirculating gas corresponding to the bypassed amount is tapped from the circuit and returned essentially undiluted to the kiln system adjacent to the location from where it was extracted making the bypass circuit into a parallel kiln gas stream with dust removal.
  • a beneficial feature of the recirculation circuit with heat exchanger is that the circuit has a hot section ( ⁇ 400-550°C) before the heat exchanger and a cold section ( ⁇ 200°C) after the heat exchanger, which makes it possible to select the tapping point (figure 3) which is best suited to the subsequent gas handling requirements.
  • This flexibility also benefits the upgrade possibilities for existing conventional bypass systems as the related requirements can be optimized individually.
  • Gas tapped from the hot section of the recirculation circuit (Figure 3A and 3B) can be returned to the kiln system with a low heat loss.
  • Gas tapped from the cold section ( Figure 3C and 3D) are suited for handling by a normal bag filter at 200°C and may be directed to the clinker cooler system to be recuperated to the kiln system. Tapping of the recirculation circuit may even be from both sections (hot/cold) simultaneously so a part is tapped to the kiln inlet 70 and the remainder to the cooler 4 system.
  • the bypass gas recirculation circuit can also recirculate a part of the fine dust which can act as a cooling medium and provide a colder surface to seed condensation/crystallization of gaseous chlorides.
  • the recirculated dust particles in the circuit can grow to a suitable size for separation in a cyclone while the fine dust escapes and returns to the quench chamber as cooling media for new particle growth by further condensation.
  • a reduction of the amount of ultrafine ( ⁇ 5 pm) dust particles will have a beneficial effect on dust handling health and safety conditions.
  • the claimed new method of using a heat exchangerto form a recirculating circuit of the bypassed combustion gases can be achieved with heat exchangers using coolants such as air or liquids and require a special design to handle dusty gas where particular attention shall be given to avoid cold surfaces or excessive cooling of the bypass gas which may cause acid condensation and corrosion.
  • a heat exchanger with two or more passes across the cooling air flow is considered necessary to achieve this. If air is used for cooling in the heat exchanger it will remain unpolluted and may be used in the kiln processes as preheated combustion air, as preheated cooling air for heat recovery in the clinker cooler or for other heating purposes such as drying or power production by WHR.
  • This invention also claims the use of a new location in the preheater 1 to extract combustion gas for the removal of alkali chlorides, here called a ‘Bottom stage bypass’.
  • a “Bottom stage bypass” is a bypass system extracting gas from the outlet duct of a bottom stage cyclone 1 e or from a cyclone 1 f in parallel with a bottom stage cyclone in the preheater 1 .
  • the location at the kiln inlet to extract combustion gas is conventionally considered the most efficient point for alkali chloride removal.
  • the conventional location also has the highest potential emission of polluting components which may subsequently require additional treatment and emission control.
  • Figure 4 schematically illustrates another embodiment of the present invention, wherein the bypass gas is extracted from a gas outlet of a bottom stage cyclone 1 e or parallel cyclone 1 f.
  • bypass gas can be extracted from both kiln inlet and from a gas outlet of a bottom stage cyclone 1 e or parallel cyclone 1 f, simultaneously.
  • the bypass gas removed at the bottom stage cyclone is a combustion gas at 800-900°C with a low dust content and a substantial part of the alkali chlorides in vaporized state.
  • the benefit of the new location is that the combustion gas has been exposed to a substantial amount of the precalcined meal in gas suspension at 800 to 900°C enabling the CaO to react with SO2 and the likes reducing the potential for emission of polluting components after having been exposed to the hot and basic (acid neutralizing) environment.
  • bypass recirculation circuit with heat exchanger reduces the gas volume by avoiding dilution from mixing ambient air to cool the bypass gas. This enables a new design and upgrade options for bypass systems to handle less gas and reduce investment cost while achieving less emission than the conventional bypass systems.
  • the kiln system will have a low emission of SOx, TOC and NOx as controlled by the calciner combustion conditions. Further reduction of NOx in kiln systems with or without calciner may be achieved with the available systems for selective catalytic or non-catalytic reduction to digest NOx.
  • the bottom stage bypass gas is a part of the exhaust gas in the preheater and may after removal of bypass dust be remixed and treated together with the preheater exhaust gas according to the requirements.
  • the bottom stage bypass gas may after separation of bypass dust be returned to the suitable preheater cyclones, the cooler 4, a WHR system or exhausted separately.
  • FIG. 5 schematically illustrates a coaxial quench chamber for a bottom stage cyclone or parallel cyclone 1 f.
  • the bypass gas taken from the gas outlet of a bottom stage cyclone may be extracted with a quench chamber 61 placed coaxially on top of the cyclone 1 f which is equipped with a tangential take out for the remaining combustion gas.
  • the coaxial quench chamber may also be placed on a separate cyclone which is connected to the gas outlet of a bottom stage cyclone.
  • the bypass gas is extracted from the top center of the tangential outlet to extract the gas with the lowest content of meal dust.
  • the “Bottom stage bypass” gas has a lower temperature than the conventional bypass gas coming from the kiln inlet. This partially compensates for the heat loss considering the bigger amount of bypass gas and lower chloride concentration.
  • FIG. 6 schematically illustrates a typical conventional bypass system for bypass gas handling in a cement kiln system for reference.
  • the bypass gas is cooled with ambient air in the quench chamber and further cooled to be dedusted by a filter before being exhausted.
  • Preheater for preheating the raw meal and recovering heat from combustion gas 1 a - 1 f Cyclone stages with 1 a being an upper cyclone, 1 e and 1 f being bottom stage cyclones.
  • Calciner with a secondary combustion zone for precalcination of raw meal while receiving preheated combustion air from clinker cooler 4.
  • Hot air duct from clinker cooler 4 to calciner 2 ‘Tertiary air duct’
  • Clinker cooler for cooling of cement clinker while recuperating heated air to the kiln system
  • Quench fan for ambient air (used in a conventional bypass system)
  • Heat exchanger for cooling recirculating bypass gas with a coolant typically ambient air
  • Tapping fan to control the quantity of bypass gas removed from the recirculation circuit while being replaced with hot bypass gas from the kiln system

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

L'invention concerne un système de dérivation pour la manipulation de gaz de dérivation dans un système de four à ciment dans une installation de fabrication de clinker de ciment, ladite installation de fabrication de clinker de ciment comprenant un préchauffeur, un four et un refroidisseur de clinker, ledit système de dérivation comprenant une liaison de conduit pour extraire un gaz de dérivation, une chambre de refroidissement rapide pour refroidir rapidement le gaz de dérivation, un échangeur de chaleur pour refroidir le gaz de dérivation refroidi rapidement, un ventilateur de recirculation pour faire recirculer le gaz de dérivation refroidi vers la chambre de refroidissement rapide, au moins un cyclone placé dans un circuit de recirculation pour séparer une partie de la poussière de dérivation pour l'élimination du circuit de recirculation et un ou plusieurs points de dérivation pour éliminer le gaz de recirculation du circuit de recirculation, le gaz de dérivation étant refroidi rapidement dans la chambre de refroidissement rapide et refroidi davantage à l'aide d'un échangeur de chaleur puis remis en circulation dans la chambre de refroidissement rapide pour être utilisé comme réfrigérant rapide.
PCT/IB2021/059116 2020-10-05 2021-10-05 Procédé et système de manipulation de gaz de dérivation dans un circuit de four à ciment WO2022074552A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0455301A2 (fr) * 1990-05-04 1991-11-06 F.L. Smidth & Co. A/S (reg. no. A/S 173386) Procédé et dispositif pour la production de clinker à partir de matières bruts minérales
WO2001072656A1 (fr) * 2000-03-27 2001-10-04 Alstom (Switzerland) Ltd Procede pour augmenter la production de clinker dans une cimenterie existante et pour produire de la vapeur
WO2019038148A1 (fr) 2017-08-22 2019-02-28 Thyssenkrupp Industrial Solutions Ag Dispositif et procédé de production de clinker de ciment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0455301A2 (fr) * 1990-05-04 1991-11-06 F.L. Smidth & Co. A/S (reg. no. A/S 173386) Procédé et dispositif pour la production de clinker à partir de matières bruts minérales
WO2001072656A1 (fr) * 2000-03-27 2001-10-04 Alstom (Switzerland) Ltd Procede pour augmenter la production de clinker dans une cimenterie existante et pour produire de la vapeur
WO2019038148A1 (fr) 2017-08-22 2019-02-28 Thyssenkrupp Industrial Solutions Ag Dispositif et procédé de production de clinker de ciment

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