EP4237777A1 - Installation et procédé de traitement thermique d'une matière première dispersible - Google Patents

Installation et procédé de traitement thermique d'une matière première dispersible

Info

Publication number
EP4237777A1
EP4237777A1 EP21791426.6A EP21791426A EP4237777A1 EP 4237777 A1 EP4237777 A1 EP 4237777A1 EP 21791426 A EP21791426 A EP 21791426A EP 4237777 A1 EP4237777 A1 EP 4237777A1
Authority
EP
European Patent Office
Prior art keywords
drying chamber
fuel
line
plant
sludge
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.)
Pending
Application number
EP21791426.6A
Other languages
German (de)
English (en)
Inventor
Sebastian Frie
Samuel Zühlsdorf
Stephan Pallmann
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 Polysius GmbH
ThyssenKrupp AG
Original Assignee
ThyssenKrupp AG
ThyssenKrupp Industrial Solutions 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
Priority claimed from DE102020128612.0A external-priority patent/DE102020128612A1/de
Priority claimed from BE20205774A external-priority patent/BE1028768B1/de
Application filed by ThyssenKrupp AG, ThyssenKrupp Industrial Solutions AG filed Critical ThyssenKrupp AG
Publication of EP4237777A1 publication Critical patent/EP4237777A1/fr
Pending 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
    • F27B7/2025—Arrangements of preheating devices for the charge consisting of a single string of cyclones
    • F27B7/2033—Arrangements of preheating devices for the charge consisting of a single string of cyclones with means for precalcining the raw material

Definitions

  • the invention relates to a plant, in particular a calciner, and a method for the thermal treatment of raw material with a means for adding fuel and a means for adding sludgy materials.
  • Sewage sludge and other sludge-like fuels are used in cement production plants, for example to burn raw meal to cement clinker.
  • Sewage sludge usually has a high level of moisture, which makes it difficult to use as fuel. Due to the high bulk density of the sewage sludge, blowing the fuel into a furnace or a calciner, for example, is not suitable. Therefore, before being fed into the kiln or calciner, the sewage sludge is preferably dried or pumped into the kiln inlet as undried sludge.
  • the hot raw meal emerging from the second-lowest cyclone stage is guided by hot gas flowing up from the rotary kiln in a gas stream into a calciner, which is arranged between the cyclone preheater and the rotary kiln.
  • a calciner which is arranged between the cyclone preheater and the rotary kiln.
  • This is usually a riser pipe in which the furnace gas and fuel are fed in parallel and react with each other.
  • fuels are added to the calciner.
  • the combustion air required for firing the calciner can, for example, be routed through the rotary kiln and/or in a separate gas line, the so-called tertiary air line, from the clinker cooler to the calciner.
  • a plant for the thermal treatment of raw material in particular a calciner, comprises a line through which hot gases flow and at least one means for adding the raw material. Furthermore, the plant has a drying chamber for drying sludge material, which is connected to the line and has means for adding the fuel and means for adding the sludge material.
  • the hot gases preferably include hot gases emerging from a rotary kiln of a cement plant, which are introduced into the inlet area, in particular the lower area of the line, and flow through the line.
  • the line comprises, for example, a riser, in particular a riser, which extends essentially vertically and runs from the rotary kiln in the direction of the last preheating stage of the preheater of a cement plant.
  • the fuels are, for example, household, industrial and/or commercial waste, preferably solid fuels. Furthermore, both liquid, pasty and solid waste and biomasses that are suitable for energetic use/co-incineration are included, which are finally processed and energetically used with a high calorific value.
  • the fuels also include for example solvents, waste oil, whole or shredded old tires as well as rice husks, straw or even animal meal. In particular, inorganic and inert components are also included.
  • the drying chamber preferably has a combustion space inside it, the drying chamber comprising means for adding the fuel and means for adding the sludge material into the combustion space.
  • the combustion chamber preferably opens into the line.
  • the drying chamber comprises in particular an area which is at least partially separated from the line in terms of flow, so that the hot gases flowing through the line do not flow through the treatment area or at least not completely. In the area of the drying chamber, there is in particular a change in the main flow direction of the line.
  • the drying chamber and the line are preferably connected to one another in such a way that the hot gases generated in the drying chamber by the at least partial conversion of the fuel flow at least partially into the line.
  • the fuels, in particular solids preferably enter the line at least partially from the drying chamber.
  • the heat generated in the drying chamber, in particular hot gases and the heat from the further conversion of the fuel and the muddy material also within the line, cause in particular the deacidification of the raw meal.
  • the drying chamber is preferably fitted circumferentially around the duct and in particular forms a partition or a complete ring. It is also conceivable to provide a plurality of drying chambers spaced apart from one another in the flow direction of the hot gas.
  • the means for adding sludge material is preferably arranged separately from the means for adding fuel.
  • a drying chamber connected to the line with a means for adding sludge material provides easy drying of the sludge material without adversely affecting the thermal treatment of the raw meal in the line.
  • the sludgy material is dried in the drying chamber and preferably partially converted together with the fuel before it is introduced into the line.
  • the means for adding sludgy materials comprises a gravity conveyor.
  • the means for adding sludge materials comprises a pump for conveying the sludge material and a pipe for directing the sludge material into the drying chamber.
  • the line preferably opens into the combustion chamber of the drying chamber, in particular into an inlet provided in the combustion chamber wall for admitting muddy material.
  • the line preferably opens into the combustion chamber of the drying chamber.
  • the means for adding sludgy materials is at least partially mounted in a side wall of the drying chamber.
  • the means is a line through which the sludge material gets into the combustion chamber due to the force of gravity.
  • the means for adding sludge-like material is arranged above, in particular at a higher level, the means for adding fuel.
  • This causes the sludge material to lie at least partially or completely on top of the fuel and prevents contact of the sludge material with the wall or floor of the combustion chamber and thus counteracts caking.
  • the sludge material preferably forms a layer on the fuel, which facilitates the conveyance of the sludge material in the direction of the duct through which hot gases flow and ensures a preferably complete or partial drying of the sludge material.
  • the fuel is, for example, solid fuel, which can be conveyed in particular by a mechanical or pneumatic conveying device, such as a conveying screw or a blower.
  • the fuel has a maximum water content of 20% to 50%, in particular 40% and/or a calorific value of at least 2000 kcal/kg, in particular at least 3000 kcal/kg.
  • the fuel preferably has a calorific value of at most 10,000 kcal/kg.
  • the fuel has in particular a water content of at least 20 to 50%, the fuel in particular household, industrial and/or commercial waste as well as solid waste and biomass.
  • the means for adding fuel comprises a mechanical, pneumatic or shear force-related conveying device.
  • the means for adding fuel is, for example, a chute or a screw conveyor.
  • the drying chamber is connected to the line in such a way that at least part of the heat generated in the drying chamber reaches the line.
  • the system is, for example, a calciner.
  • the line is preferably a riser through which a raw meal gas mixture flows in a vertical direction.
  • the drying chamber is preferably attached to the duct in such a way that at least part of the hot gases mixed with the raw material enter the drying chamber and there come into contact with the fuel and the sludge material, so that the sludge material is dried. This enables the sewage sludge to be dried as energy-efficiently as possible outside the line, with heat being exchanged with the line at the same time.
  • the drying chamber has a support surface for receiving the fuel and the sludge material and wherein the fuel and the sludge material are movable by gravity or a conveyor, pneumatically or mechanically along the support surface.
  • a movement of the fuel along the bearing surface in the direction of the line ensures that the fuel is converted substantially uniformly, so that it is preferably completely converted when it enters the line.
  • the bearing surface has an angle of attack and a length that guarantee a corresponding minimum residence time in the combustion chamber, so that the sludge material is at least partially or completely dried before it enters the duct.
  • the drying chamber comprises means for supplying combustion air.
  • the means for supplying combustion air is for example, it is a shaft-like air inlet duct, which runs vertically, for example, and opens into the combustion chamber, in particular the drying chamber, at its upper end.
  • the means for supplying combustion air forms at the same time an inlet for admitting the sludge material into the drying chamber.
  • the combustion air is, for example, cooler exhaust air, so that the means for supplying combustion air is connected to the cooler, in particular to a cooling air outlet of the cooler.
  • the invention also includes a plant for the production of cement clinker comprising: a preheater for preheating cement raw meal, a kiln for burning the preheated raw meal into cement clinker and a cooler for cooling the burnt cement clinker, with between the preheater and the kiln a plant for thermal treatment such as is arranged as described above.
  • the preheater is, for example, a cyclone preheater with a plurality of cyclones connected in series for separating solid substances from the gas flow.
  • the kiln is preferably a rotary kiln, which is gas-technically connected to the preheater, so that the kiln exhaust gas is fed to the preheater and the raw meal fed into the preheater is heated in countercurrent.
  • the material burned to clinker in the kiln is fed to the subsequent cooler and cooled there.
  • the cooler exhaust air is fed to the furnace and/or the preheater, for example.
  • the invention also includes a method for the thermal treatment of raw material, in particular raw cement powder and/or mineral products, the raw material being introduced into a line through which hot gases flow and being thermally treated by the hot gases.
  • Fuel and a sludge material is introduced into a drying chamber, the sludge material being dried therein and the heat generated in the drying chamber being at least partially conducted to the duct.
  • At least part of the hot gases mixed with the raw material preferably reaches the drying chamber and comes in there with the fuel Contact that is thereby dried and/or at least partially degassed and/or at least partially reacted.
  • the fuel and the sludgy material lies on a support surface of the drying chamber and is then conveyed mechanically and/or pneumatically and/or by gravity from the support surface into the line.
  • the line and/or the drying chamber is supplied with oxygen-containing combustion air.
  • the sludgy material is introduced into the drying chamber above the fuel.
  • the muddy material and/or the fuel is conveyed pneumatically, mechanically or by gravity into the drying chamber.
  • FIG. 1 shows a schematic representation of a plant for the production of cement according to an exemplary embodiment.
  • FIG. 2 shows a schematic representation of a section of a plant for the production of cement with a drying chamber according to an exemplary embodiment.
  • FIG. 3 shows a schematic representation of a section of a plant for the production of cement with a drying chamber according to a further exemplary embodiment.
  • Fig. 1 shows a plant for the production of cement clinker, for example, with a multi-stage preheater 12 for preheating cement raw meal 11, a calciner 16 for calcining the preheated cement raw meal 14.
  • the plant 10 also has a furnace 22 for burning the calcined cement raw meal 18 into cement clinker and a cooler 26 for cooling the cement clinker.
  • the hot gases 20 arising in the furnace 22 first flow through the calciner 16 and then through the preheater 12 .
  • these exemplary embodiments can also relate to other systems for the thermal treatment or chemical conversion of airworthy raw material, such as ore reduction, and are therefore not limited to a calciner.
  • the plant shows a plant 16 for the thermal treatment of an airborne raw material, in particular a calciner.
  • the plant comprises a substantially vertically extending duct 32 to which a drying chamber 28 is attached.
  • the drying chamber 28 forms a radial bulge of the line 32 and each has a combustion chamber 30 which is open towards the line 32 and opens into the interior of the line 32 .
  • the drying chamber 28 has a bearing surface 42 which extends at an angle to the horizontal, preferably sloping in the direction of the line 32 .
  • means 38 for adding fuel 36 are provided, which in the exemplary embodiment shown comprise a screw conveyor.
  • the fuel is preferably a high-calorific fuel which preferably has a calorific value of approximately 2000 kcal/kg to 4000 kcal/kg, in particular 3000 kcal/kg.
  • the fuel 36 is pushed onto the support surface 42 via the means 38 .
  • the raw material 48 to be thermally treated is supplied, for example, in a lower area of the line 32 via the means 56 .
  • the line 32 and/or the drying chamber 28 is supplied with oxygen-containing combustion air 46 via means 44 .
  • the oxygen-containing combustion air is, for example, cooler exhaust air 24 according to FIG. 1 or ambient air enriched with oxygen. This is fed to line 32 , for example, below or at the same level as combustion chamber 30 . It is also conceivable to arrange an oxygen line separate from means 44 for conducting oxygen into line 32 and/or drying chamber 28, so that in addition to cooler exhaust air 24, oxygen or ambient air enriched with oxygen is introduced into line and/or drying chamber 28 will.
  • the drying chamber 28 further includes a means 40 for adding muddy materials 68, such as sewage sludge, into the combustion chamber 30 of the drying chamber 28.
  • the means 40 optionally includes a pump, not shown, for conveying the muddy material 68 and a line for conducting the muddy material into the combustion chamber 30.
  • the means 40 for adding sludge materials 68 is at least partially arranged in a side wall of the drying chamber 28.
  • the means 40 can also be a line through which the sludgy material 68 reaches the combustion chamber due to the force of gravity.
  • the drying chamber 28 preferably has a conveying device 34 for conveying the material lying on the support surface 42 .
  • the conveying device 34 is, for example, a pneumatic conveying device 34 with preferably at least two pressure accumulators 58, 62 for storing compressed air.
  • the bearing surface 42 preferably has a plurality of compressed air inlets which are connected to the accumulators 58, 62 and have, for example, in the conveying direction of the material. It is also conceivable that the conveying device 34 is a mechanical conveying device, such as a moving grate or a moving floor.
  • the combustion chamber 30 is preferably connected to the line 32 in such a way that a portion of the hot gases 52 mixed with the raw material 48 reaches the combustion chamber 30, for example in the manner of a reverse flow, and is mixed there with the fuel 36 remaining on the support surface 42 and the muddy material 68 in Contact is thereby dried and / or partially degassed and / or at least partially implemented.
  • the sludge 68 is mixed with the fuel 36 in the combustor 30 such that the sludge is dried.
  • the means 40 for adding the sludge material 68 into the combustion chamber 30 is preferably mounted above the means for adding fuel 36 .
  • the addition of fuel 36 and sludge material 68 takes place in such a way that the sludge material 68 lies at least partially or completely on the fuel 36 . This prevents the muddy material from coming into contact with the wall or the floor of the combustion chamber 30 and thus counteracts caking.
  • the fuel 36 and the sludge material 68 are transported by means of the conveyor 34 in the direction of the line 32.
  • the conveying device 34 can optionally be a blower, slide or ram.
  • the means for adding fuel and the conveyor device 34 are preferably operated in a coordinated manner by means of a control/regulating device, not shown, so that the fuel 36 and the sludgy material remain in the combustion chamber 30 for a sufficient time and are at least partially converted there in the desired manner will.
  • Fig. 3 shows another embodiment of a system 16 for the thermal treatment of airworthy raw material 48.
  • the system 16 essentially corresponds to the system shown in Fig. 2, with an additional air inlet duct 64 being provided, which opens into the combustion chamber 30 and through which combustion air 66 is introduced into the combustion chamber 30.
  • the combustion air preferably has a
  • the combustion air is taken from the cooler 26 as cooler exhaust air.
  • the air inlet 64 is therefore preferably connected to the radiator 26 for directing the exhaust air to the air inlet 64 .
  • the preheated raw material 48 is preferably introduced into the combustion chamber 30 via the air inlet duct 64 .
  • the system 16 of FIG. 3 also optionally has a blower 70 or a compressor and a cooling air inlet 72 which opens into the combustion chamber 30 .
  • the cooling air introduced into the combustion chamber via the cooling air inlet is used to cool the fuel before it enters line 32.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Sludge (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

La présente invention concerne une installation (16) destinée au traitement thermique de matière première (14), en particulier un calcinateur (16), comportant une conduite (32) parcourue par des gaz chauds et au moins un moyen (56) destiné à ajouter la matière première (48), l'installation (10) présentant une chambre de séchage (28) destinée à sécher de la matière boueuse qui communique avec la conduite (32) et un moyen (38) pour ajouter du combustible (36) et un moyen (40), séparé du précédent, destiné à ajouter des matières boueuses (68) dans chaque cas dans la chambre de séchage (28). La présente invention concerne également un procédé de traitement thermique de matière première (48), en particulier de farine crue à ciment et/ou de produits minéraux, la matière première (48) étant introduite dans une conduite (32) parcourue par des gaz chauds et étant traitée thermiquement par les gaz chauds (52), du combustible (36) et séparément de celui-ci, une matière boueuse (68) étant introduits dans une chambre de séchage (28) et la matière boueuse (68) étant séchée dans ladite chambre de séchage et la chaleur produite dans la chambre de séchage (28) étant acheminée au moins en partie jusqu'à la conduite (32).
EP21791426.6A 2020-10-30 2021-10-22 Installation et procédé de traitement thermique d'une matière première dispersible Pending EP4237777A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102020128612.0A DE102020128612A1 (de) 2020-10-30 2020-10-30 Anlage und Verfahren zur thermischen Behandlung von flugfähigem Rohmaterial
BE20205774A BE1028768B1 (de) 2020-10-30 2020-10-30 Anlage und Verfahren zur thermischen Behandlung von flugfähigem Rohmaterial
PCT/EP2021/079306 WO2022090068A1 (fr) 2020-10-30 2021-10-22 Installation et procédé de traitement thermique d'une matière première dispersible

Publications (1)

Publication Number Publication Date
EP4237777A1 true EP4237777A1 (fr) 2023-09-06

Family

ID=78179456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21791426.6A Pending EP4237777A1 (fr) 2020-10-30 2021-10-22 Installation et procédé de traitement thermique d'une matière première dispersible

Country Status (2)

Country Link
EP (1) EP4237777A1 (fr)
WO (1) WO2022090068A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3542004A1 (de) * 1985-11-28 1987-06-04 Kloeckner Humboldt Deutz Ag Trocknung und verbrennung von schlaemmen beim brennprozess mineralischer stoffe
DE69406661T2 (de) 1993-06-03 1998-06-04 F.L. Smidth & Co. A/S, Valby Verfahren und anlage zur herstellung von zementklinker
DE102004009689A1 (de) * 2004-02-27 2005-09-08 Polysius Ag Anlage zur Herstellung von Zementklinker
DE102011001773B4 (de) * 2011-04-04 2013-01-24 Thyssenkrupp Polysius Ag Verfahren und Anlage zur Herstellung von Zementklinker
DE102016211181A1 (de) * 2016-06-22 2017-12-28 Thyssenkrupp Ag Anlage und Verfahren zur thermischen Behandlung von flugfähigem Rohmaterial

Also Published As

Publication number Publication date
WO2022090068A1 (fr) 2022-05-05

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