EP0576053A1 - Process for drying aqueous solids in a fluidized bed - Google Patents
Process for drying aqueous solids in a fluidized bed Download PDFInfo
- Publication number
- EP0576053A1 EP0576053A1 EP93201455A EP93201455A EP0576053A1 EP 0576053 A1 EP0576053 A1 EP 0576053A1 EP 93201455 A EP93201455 A EP 93201455A EP 93201455 A EP93201455 A EP 93201455A EP 0576053 A1 EP0576053 A1 EP 0576053A1
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- European Patent Office
- Prior art keywords
- condensate
- cleaning zone
- stripping medium
- fluidized bed
- vapor
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- 239000007787 solid Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 23
- 238000001035 drying Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims description 18
- 238000009835 boiling Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 4
- 239000000571 coke Substances 0.000 claims description 3
- 239000000356 contaminant Substances 0.000 claims description 2
- 238000007669 thermal treatment Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 abstract description 4
- 239000003517 fume Substances 0.000 abstract 5
- 239000007789 gas Substances 0.000 abstract 1
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000003077 lignite Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
Definitions
- the invention relates to a process for drying a water-containing solid in a fluidized bed, which is indirectly heated by at least one heat exchanger device, thereby withdrawing vapor rich in vapor from the fluidized bed and passing some of the vapors as fluidizing medium through the fluidized bed, the rest or one another part of the vapors is cooled to form vapor condensate.
- the solid to be dried can e.g. are coal, brown coal, peat, a water-based waste material or sludge.
- the invention has for its object to sufficiently clean the vapor condensate formed in the process mentioned at the beginning in a simple and effective manner. According to the invention, this is done by bringing at least part of the vapor condensate into direct contact with gaseous or vaporous stripping medium in a cleaning zone and withdrawing partially cleaned condensate and stripping medium containing contaminants from the cleaning zone.
- the inventive method of cleaning the vapor condensate can be designed in various ways. It is particularly useful to use water vapor as the stripping medium. It can be recommended that Guide the condensate into the cleaning zone at a temperature that is 0 to 10 ° C below the boiling temperature. As a result, the amount of water vapor used as the stripping medium can be kept low and, for example, in the range from 1 to 10% by weight of the amount of condensate.
- the stripping medium water vapor
- the stripping medium is generated by boiling and evaporating vapor condensate in the cleaning zone itself.
- the vapors can be condensed under excess pressure (e.g. 1.5 to 10 bar) in the drying process itself, as described in German Patent 36 44 806. However, it is also possible to remove the vapor condensate to be cleaned outside the drying process at about atmospheric pressure (i.e. about the pressure at which the vapors leave the fluidized bed) or else at a pressure of 0.01 to 0.5 bar, e.g. after relaxation in a condensation turbine.
- excess pressure e.g. 1.5 to 10 bar
- the water-containing solids to be dried are fed through line (1) to a reactor (2) in which a fluidized bed (3) is located.
- a heat exchanger device (4) through which a heating medium flows is arranged in the region of the fluidized bed (3).
- Eddy medium emerges through pipes (5), which form a nozzle grate.
- the fluidizing medium which is introduced in line (6) is a part of the water vapor-rich vapors which arise in the fluidized bed (3) during drying of the solid.
- Vapors containing solids leave the fluidized bed (3) through the channel (9) and first reach a dedusting device (10), e.g. an electrostatic filter or a bag filter.
- the solids separated out are led back through line (11) into the fluidized bed (3) or removed through line (11a).
- the largely dedusted vapors leave the dedusting device (10) through line (12) and are divided between lines (13) and (14).
- the vapors of line (13) are led back through the blower (15) and line (6) as fluidizing medium into the reactor (2).
- these vapors are passed through line (17) to a compressor (16), which is preferably designed in several stages.
- a compressor (16) By injecting water through line (20), saturated steam conditions are established in the condensed vapors of line (21).
- These compressed vapors serve as heating medium and are fed through the line (21) to the heat exchanger device (4), the vapors at least partially condensing when flowing through the heat exchanger device.
- the heat of condensation released serves as an effective energy source for indirect heating of the fluidized bed (3). Largely dried solid material slides down between the tubes (5) into the collecting chamber (2a) of the reactor (2) and is drawn off by the metering device (23).
- the vapor condensate leaving the heat exchanger device (4) in line (25) contains various types of impurities.
- a stripping column (26) which e.g. Contains bottoms or packing.
- a gaseous or vaporous stripping medium is fed through the line (27) into the lower region of the column (26).
- Steam is recommended as the stripping medium if the condensate led through the line (25) into the column (26) has a temperature which is 0 to 10 ° C and preferably at most 5 ° C below the boiling temperature.
- the water vapor can also be generated by indirectly heating the vapor condensate. Boiling and evaporating vapor condensate can e.g. take place in the lower region of the stripping column (26) or outside.
- the stripping medium containing impurities is drawn off at the top of the column (26) through line (29) and disposed of, for example by thermal treatment, in particular in an incineration plant. Another possibility is to pass the stripping medium drawn off in line (29) over activated carbon or activated coke for cleaning. If steam was used as the stripping medium, the cleaned water vapor can be dried continue to use, eg as a vortex medium. Alternatively, the contaminated stripping medium can also be condensed and the condensate can be disposed of by distributing it on the dried solid material.
- Fig. 2 the reactor (2) with the fluidized bed (3) and the heat exchanger device (4) is again shown to dry the water-containing solids introduced in the line (1).
- Low-water solids are drawn off in line (24).
- the heating medium which is fed to the heat exchanger device through line (30) is now not compressed vapors, but e.g. Extraneous steam or thermal oil.
- Dedusted vapors are led through line (31) to an expansion turbine (32), which is followed by a condenser (33).
- the turbine (32) is preferably used to generate electrical energy.
- the vapor condensate coming from the condenser (33) passes through the line (34) into the stripping column (26), to which stripping medium, in particular water vapor, is fed through the line (27a).
- This stripping medium can be a partial flow of the dedusted vapors.
- At least partially cleaned condensate leaves the column (26) in line (28) and stripping medium containing impurities is drawn off in line (29) via a vacuum pump (37).
- Fig. 3 shows a modification of the method of Fig. 2, wherein the column (26) is operated at approximately atmospheric pressure.
- the dedusted vapors from the lines (12) and (31) are led according to FIG. 3 to a condensation device (36), the heat of condensation being released being used as desired.
- the vapor condensate formed passes through line (34) for purification into the stripping column (26), to which stripping medium, for example water vapor, is fed through line (27).
- a fluidized bed dryer (2) shown in FIG. 2 100 t / h of lignite with grain sizes approximately below 8 mm and with a raw moisture content of 62.3% by weight are fed through line (1). 73.5 t / h of saturated steam with a temperature of 160 ° C. and a pressure of 6 bar are used as the heating medium, which is passed through the line (30) into the heat exchanger device (4), where the water vapor condenses. The heat required for drying is transferred to the fluidized bed (3), which is heated to approximately 105 ° C.
- the chemical oxygen demand (COD) of the vapor condensate in line (34) is 110 mg O2 / l.
- COD chemical oxygen demand
- the vapor condensate in the stripping column (26) which has 12 trays, is cleaned to a COD of 50 mg O2 / l, so that it can be placed in a receiving water can.
- Via line (29) 1 t / h of contaminated stripping steam is withdrawn from the column with a COD of 3.37 g of O2 / l and burned.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Trocknen eines wasserhaltigen Feststoffes in einem Wirbelbett, das durch mindestens eine Wärmetauscher-Einrichtung indirekt beheizt wird, dabei zieht man aus dem Wirbelbett wasserdampfreiche Brüden ab und leitet einen Teil der Brüden als Wirbelmedium durch das Wirbelbett, den Rest oder einen weiteren Teil der Brüden kühlt man unter Bildung von Brüdenkondensat ab. Bei dem zu trocknenden Feststoff kann es sich z.B. um Kohle, Braunkohle, Torf, einen wasserhaltigen Abfallstoff oder Schlamm handeln.The invention relates to a process for drying a water-containing solid in a fluidized bed, which is indirectly heated by at least one heat exchanger device, thereby withdrawing vapor rich in vapor from the fluidized bed and passing some of the vapors as fluidizing medium through the fluidized bed, the rest or one another part of the vapors is cooled to form vapor condensate. The solid to be dried can e.g. are coal, brown coal, peat, a water-based waste material or sludge.
Ein Verfahren dieser Art ist im deutschen Patent 29 01 723 und im dazu korrespondierenden US-Patent 4 295 281 sowie im deutschen Patent 36 44 806 und in der deutschen Offenlegungsschrift 39 43 366 beschrieben. Bei diesem Verfahren entsteht zwangsläufig ein Brüdenkondensat, das gewisse Verunreinigungen enthält, so daß das Kondensat zumeist nicht direkt in den Vorfluter einer Kanalisation geleitet werden kann.A method of this type is described in
Der Erfindung liegt die Aufgabe zugrunde, das beim eingangs genannten Verfahren entstehende Brüdenkondensat auf einfache und wirksame Weise ausreichend zu reinigen. Erfindungsgemäß geschieht dies dadurch, daß man mindestens einen Teil des Brüdenkondensats in einer Reinigungszone mit gas- oder dampfförmigem Strippmedium in direkten Kontakt bringt und aus der Reinigungszone teilweise gereinigtes Kondensat und Verunreinigungen enthaltendes Strippmedium abzieht.The invention has for its object to sufficiently clean the vapor condensate formed in the process mentioned at the beginning in a simple and effective manner. According to the invention, this is done by bringing at least part of the vapor condensate into direct contact with gaseous or vaporous stripping medium in a cleaning zone and withdrawing partially cleaned condensate and stripping medium containing contaminants from the cleaning zone.
Das erfindungsgemäße Verfahren der Reinigung des Brüdenkondensats kann auf verschiedene Weise ausgestaltet werden. Es ist besonders zweckmäßig, als Strippmedium Wasserdampf zu verwenden. Dabei kann es sich empfehlen, das Kondensat mit einer Temperatur, die 0 bis 10°C unter der Siedetemperatur liegt, in die Reinigungszone zu leiten. Dadurch kann die Menge des als Strippmedium eingesetzten Wasserdampfs niedrig und z.B. im Bereich von 1 bis 10 Gew.% der Kondensatmenge gehalten werden.The inventive method of cleaning the vapor condensate can be designed in various ways. It is particularly useful to use water vapor as the stripping medium. It can be recommended that Guide the condensate into the cleaning zone at a temperature that is 0 to 10 ° C below the boiling temperature. As a result, the amount of water vapor used as the stripping medium can be kept low and, for example, in the range from 1 to 10% by weight of the amount of condensate.
Um das Brüdenkondensat beim Eintritt in die Reinigungszone in der Nähe der Siedetemperatur zu halten, kann es ferner zweckmäßig sein, das heiße Kondensat in die Reinigungszone hinein zu entspannen. Hierbei stellt sich die dem Entspannungsdruck entsprechende Siedetemperatur automatisch ein. Dies führt zu einer Teilverdampfung und dadurch zum teilweisen Strippen des Kondensats.In order to keep the vapor condensate near the boiling point when it enters the cleaning zone, it may also be expedient to relax the hot condensate into the cleaning zone. The boiling temperature corresponding to the relaxation pressure is set automatically. This leads to partial evaporation and thus to partial stripping of the condensate.
Bei einer weiteren Verfahrensvariante erzeugt man das Strippmedium, Wasserdampf, durch Aufkochen und Verdampfen von Brüdenkondensat in der Reinigungszone selbst.In a further process variant, the stripping medium, water vapor, is generated by boiling and evaporating vapor condensate in the cleaning zone itself.
Die Kondensation der Brüden kann unter Überdruck (z.B. 1,5 bis 10 bar) im Trocknungsverfahren selbst erfolgen, wie es im deutschen Patent 36 44 806 beschrieben ist. Es ist aber auch möglich, das zu reinigende Brüdenkondensat außerhalb des Trocknungsverfahrens bei etwa Atmosphärendruck (d.h. etwa dem Druck, mit dem die Brüden das Wirbelbett verlassen) oder aber bei einem Druck von 0,01 bis 0,5 bar, z.B. nach Entspannung in einer Kondensationsturbine, zu erzeugen.The vapors can be condensed under excess pressure (e.g. 1.5 to 10 bar) in the drying process itself, as described in
Ausgestaltungsmöglichkeiten des Verfahrens werden mit Hilfe der Zeichnung erläutert. Es zeigt
- Fig. 1
- das Fließschema einer ersten Verfahrensvariante,
- Fig. 2
- das Fließschema einer zweiten Verfahrensvariante und
- Fig. 3
- eine Abwandlung des Verfahrens der Fig. 2.
- Fig. 1
- the flow diagram of a first process variant,
- Fig. 2
- the flow diagram of a second process variant and
- Fig. 3
- a modification of the method of FIG. 2.
Gemäß Fig. 1 werden die wasserhaltigen, zu trocknenden Feststoffe durch die Leitung (1) einem Reaktor (2) aufgegeben, in welchem sich ein Wirbelbett (3) befindet. Im Bereich des Wirbelbettes (3) ist eine Wärmetauscher-Einrichtung (4) angeordnet, die von einem Heizmedium durchströmt wird. Wirbelmedium tritt durch Rohrleitungen (5) aus, die einen Düsenrost bilden. Bei dem Wirbelmedium, das in der Leitung (6) herangeführt wird, handelt es sich um einen Teil der wasserdampfreichen Brüden, die bei der Trocknung des Feststoffes im Wirbelbett (3) entstehen.1, the water-containing solids to be dried are fed through line (1) to a reactor (2) in which a fluidized bed (3) is located. A heat exchanger device (4) through which a heating medium flows is arranged in the region of the fluidized bed (3). Eddy medium emerges through pipes (5), which form a nozzle grate. The fluidizing medium which is introduced in line (6) is a part of the water vapor-rich vapors which arise in the fluidized bed (3) during drying of the solid.
Feststoffe enthaltende Brüden verlassen das Wirbelbett (3) durch den Kanal (9) und gelangen zunächst zu einer Entstaubungseinrichtung (10), z.B. ein Elektrofilter oder ein Schlauchfilter. Die darin abgeschiedenen Feststoffe werden durch die Leitung (11) zurück in das Wirbelbett (3) geführt oder durch die Leitung (11a) abgeführt. Die weitgehend entstaubten Brüden verlassen die Entstaubungseinrichtung (10) durch die Leitung (12) und werden auf die Leitungen (13) und (14) aufgeteilt. Die Brüden der Leitung (13) führt man durch das Gebläse (15) und die Leitung (6) als Wirbelmedium zurück in den Reaktor (2).Vapors containing solids leave the fluidized bed (3) through the channel (9) and first reach a dedusting device (10), e.g. an electrostatic filter or a bag filter. The solids separated out are led back through line (11) into the fluidized bed (3) or removed through line (11a). The largely dedusted vapors leave the dedusting device (10) through line (12) and are divided between lines (13) and (14). The vapors of line (13) are led back through the blower (15) and line (6) as fluidizing medium into the reactor (2).
Für die restlichen Brüden in der Leitung (14) bietet es sich an, ihren Wärmeinhalt auszunutzen. Beim Verfahren der Fig. 1 leitet man diese Brüden durch die Leitung (17) zu einem Verdichter (16), der vorzugsweise mehrstufig ausgebildet ist. Durch Wassereinspritzung durch die Leitung (20) stellt man in den verdichteten Brüden der Leitung (21) Sattdampfbedingungen ein. Diese verdichteten Brüden dienen als Heizmedium und werden durch die Leitung (21) der Wärmetauscher-Einrichtung (4) zugeführt, wobei die Brüden beim Durchströmen durch die Wärmetauscher-Einrichtung mindestens teilweise kondensieren. Dabei dient die freigesetzte Kondensationswärme als wirksame Energiequelle zum indirekten Erhitzen des Wirbelbettes (3). Weitgehend getrocknetes Feststoffmaterial rutscht zwischen den Röhren (5) hindurch nach unten in die Sammelkammer (2a) des Reaktors (2) und wird durch das Dosierorgan (23) abgezogen.For the remaining vapors in line (14), it is advisable to use their heat content. In the process of FIG. 1, these vapors are passed through line (17) to a compressor (16), which is preferably designed in several stages. By injecting water through line (20), saturated steam conditions are established in the condensed vapors of line (21). These compressed vapors serve as heating medium and are fed through the line (21) to the heat exchanger device (4), the vapors at least partially condensing when flowing through the heat exchanger device. The heat of condensation released serves as an effective energy source for indirect heating of the fluidized bed (3). Largely dried solid material slides down between the tubes (5) into the collecting chamber (2a) of the reactor (2) and is drawn off by the metering device (23).
Das die Wärmeaustauscher-Einrichtung (4) in der Leitung (25) verlassende Brüdenkondensat enthält verschiedenartige Verunreinigungen. Um dieses Kondensat mindestens teilweise zu reinigen, gibt man es einer Strippkolonne (26) auf, die z.B. Böden oder Füllkörper enthält. In den unteren Bereich der Kolonne (26) speist man durch die Leitung (27) ein gas- oder dampfförmiges Strippmedium ein. Als Strippmedium ist Wasserdampf dann empfehlenswert, wenn das durch die Leitung (25) in die Kolonne (26) geführte Kondensat eine Temperatur aufweist, die 0 bis 10°C und vorzugsweise höchstens 5°C unter der Siedetemperatur liegt. Dadurch wird in der Kolonne (26) nur wenig des als Strippmedium benutzten Wasserdampfs dadurch verbraucht, daß dieser Wasserdampf in der Kolonne (26) kondensiert.The vapor condensate leaving the heat exchanger device (4) in line (25) contains various types of impurities. In order to at least partially purify this condensate, it is placed in a stripping column (26), which e.g. Contains bottoms or packing. A gaseous or vaporous stripping medium is fed through the line (27) into the lower region of the column (26). Steam is recommended as the stripping medium if the condensate led through the line (25) into the column (26) has a temperature which is 0 to 10 ° C and preferably at most 5 ° C below the boiling temperature. As a result, only a little of the water vapor used as stripping medium is consumed in the column (26) in that this water vapor condenses in the column (26).
Anstatt von einer Fremdquelle Wasserdampf als Strippmedium heranzuführen, kann man den Wasserdampf auch durch indirekt beheiztes Aufkochen des Brüdenkondensats selbst erzeugen. Das Aufkochen und Verdampfen von Brüdenkondensat kann z.B. im unteren Bereich der Strippkolonne (26) oder außerhalb erfolgen.Instead of using water vapor as a stripping medium from an external source, the water vapor can also be generated by indirectly heating the vapor condensate. Boiling and evaporating vapor condensate can e.g. take place in the lower region of the stripping column (26) or outside.
Weitgehend gereinigtes Kondensat verläßt die Kolonne (26) in der Leitung (28) und kann z.B. in einen Vorfluter geleitet werden. Das Verunreinigungen enthaltende Strippmedium zieht man am Kopf der Kolonne (26) durch die Leitung (29) ab und entsorgt es z.B. durch thermische Behandlung insbesondere in einer Verbrennungsanlage. Eine andere Möglichkeit besteht darin, das in der Leitung (29) abgezogene Strippmedium zum Reinigen über Aktivkohle oder Aktivkoks zu leiten. Wenn als Strippmedium Wasserdampf verwendet wurde, kann man den gereinigten Wasserdampf im Trocknungsverfahren weiterverwenden, z.B. als Wirbelmedium. Alternativ kann das verunreinigte Strippmedium auch kondensiert und das Kondensat durch Verteilen auf das getrocknete Feststoffmaterial entsorgt werden.Largely cleaned condensate leaves the column (26) in line (28) and can, for example, be led into a receiving water. The stripping medium containing impurities is drawn off at the top of the column (26) through line (29) and disposed of, for example by thermal treatment, in particular in an incineration plant. Another possibility is to pass the stripping medium drawn off in line (29) over activated carbon or activated coke for cleaning. If steam was used as the stripping medium, the cleaned water vapor can be dried continue to use, eg as a vortex medium. Alternatively, the contaminated stripping medium can also be condensed and the condensate can be disposed of by distributing it on the dried solid material.
In Fig. 2 ist wieder der Reaktor (2) mit dem Wirbelbett (3) und der Wärmetauscher-Einrichtung (4) dargestellt, um die in der Leitung (1) herangeführten wasserhaltigen Feststoffe zu trocknen. Wasserarme Feststoffe werden in der Leitung (24) abgezogen. Soweit gleiche Bezugsziffern verwendet sind, gelten auch hier die bereits zusammen mit Fig. 1 gegebenen Erläuterungen. Das Heizmedium, das man der Wärmetauscher-Einrichtung durch die Leitung (30) zuführt, sind nunmehr nicht verdichtete Brüden, sondern z.B. Fremddampf oder Thermoöl. Entstaubte Brüden werden durch die Leitung (31) zu einer Entspannungsturbine (32) geführt, der ein Kondensator (33) nachgeschaltet ist. Die Turbine (32) dient bevorzugt der Erzeugung elektrischer Energie. Das aus dem Kondensator (33) kommende Brüdenkondensat gelangt durch die Leitung (34) in die Strippkolonne (26), der man Strippmedium, insbesondere Wasserdampf, durch die Leitung (27a) zuführt. Bei diesem Strippmedium kann es sich um einen Teilstrom der entstaubten Brüden handeln. Zumindest teilweise gereinigtes Kondensat verläßt die Kolonne (26) in der Leitung (28) und Verunreinigungen enthaltendes Strippmedium zieht man in der Leitung (29) über eine Vakuumpumpe (37) ab.In Fig. 2 the reactor (2) with the fluidized bed (3) and the heat exchanger device (4) is again shown to dry the water-containing solids introduced in the line (1). Low-water solids are drawn off in line (24). As far as the same reference numbers are used, the explanations already given together with FIG. 1 also apply here. The heating medium which is fed to the heat exchanger device through line (30) is now not compressed vapors, but e.g. Extraneous steam or thermal oil. Dedusted vapors are led through line (31) to an expansion turbine (32), which is followed by a condenser (33). The turbine (32) is preferably used to generate electrical energy. The vapor condensate coming from the condenser (33) passes through the line (34) into the stripping column (26), to which stripping medium, in particular water vapor, is fed through the line (27a). This stripping medium can be a partial flow of the dedusted vapors. At least partially cleaned condensate leaves the column (26) in line (28) and stripping medium containing impurities is drawn off in line (29) via a vacuum pump (37).
Fig. 3 zeigt eine Abwandlung des Verfahrens der Fig. 2, wobei die Kolonne (26) etwa unter Atmosphärendruck betrieben wird. Die entstaubten Brüden aus den Leitungen (12) und (31) werden gemäß Fig. 3 zu einer Kondensationseinrichtung (36) geführt, wobei die frei werdende Kondensationswärme beliebig genutzt wird. Das gebildete Brüdenkondensat gelangt über die Leitung (34) zum Reinigen in die Strippkolonne (26), der man Strippmedium, z.B. Wasserdampf, durch die Leitung (27) zuführt.Fig. 3 shows a modification of the method of Fig. 2, wherein the column (26) is operated at approximately atmospheric pressure. The dedusted vapors from the lines (12) and (31) are led according to FIG. 3 to a condensation device (36), the heat of condensation being released being used as desired. The vapor condensate formed passes through line (34) for purification into the stripping column (26), to which stripping medium, for example water vapor, is fed through line (27).
In einem in Fig. 2 dargestellten Wirbelbett-Trockner (2) werden durch die Leitung (1) 100 t/h Braunkohle mit Korngrößen etwa unterhalb von 8 mm und mit einer Rohfeuchte von 62,3 Gew.% aufgegeben. Als Heizmedium dienen 73,5 t/h Sattdampf mit einer Temperatur von 160°C und einem Druck von 6 bar, der durch die Leitung (30) in die Wärmetauscher-Einrichtung (4) geleitet wird, wo der Wasserdampf kondensiert. Hierbei wird die für die Trocknung benötigte Wärme an das Wirbelbett (3) abgegeben, welches auf etwa 105°C aufgeheizt wird.In a fluidized bed dryer (2) shown in FIG. 2, 100 t / h of lignite with grain sizes approximately below 8 mm and with a raw moisture content of 62.3% by weight are fed through line (1). 73.5 t / h of saturated steam with a temperature of 160 ° C. and a pressure of 6 bar are used as the heating medium, which is passed through the line (30) into the heat exchanger device (4), where the water vapor condenses. The heat required for drying is transferred to the fluidized bed (3), which is heated to approximately 105 ° C.
Aus dem Trockner werden durch die Leitung (24) 43,8 t/h Trockenbraunkohle mit einer Restfeuchte von 14 Gew.% und 155,6 t/h Brüden durch den Kanal (9) abgezogen. Nach ihrer Entstaubung im Elektrofilter (10) werden pro Stunde 99,4 t als Teilstrom der Brüden über Leitung (13), Gebläse (15) und Leitung (6) in den Wirbelbett-Trockner als Wirbeldampf zurückgeführt. Die restlichen 56,2 t/h Brüden werden, wie in Fig. 3 dargestellt, durch die Leitung (31) einer Kondensationseinrichtung (36) zugeführt, wo die Brüden unter Abgabe ihrer Kondensationswärme bei etwa 100°C kondensiert werden.43.8 t / h of dry lignite with a residual moisture content of 14% by weight and 155.6 t / h of vapors are withdrawn from the dryer through the duct (24) through the duct (9). After they have been dedusted in the electrostatic filter (10), 99.4 t per hour are returned as part of the vapors via line (13), blower (15) and line (6) to the fluidized bed dryer as vortex steam. The remaining 56.2 t / h vapors are, as shown in Fig. 3, fed through line (31) to a condensation device (36), where the vapors are condensed at about 100 ° C., giving off their heat of condensation.
Der chemische Sauerstoffbedarf (CSB) des Brüdenkondensats in Leitung (34) liegt bei 110 mg O₂/l. Durch Strippen mit 1 t/h Niederdruck-Sattdampf aus der Leitung (27) wird das Brüdenkondensat in der Strippkolonne (26), welche 12 Böden aufweist, auf einen CSB von 50 mg O₂/l gereinigt, so daß es in einen Vorfluter gegeben werden kann. Über die Leitung (29) wird 1 t/h verunreinigter Strippdampf aus der Kolonne mit einem CSB von 3,37 g O₂/l abgezogen und verbrannt.The chemical oxygen demand (COD) of the vapor condensate in line (34) is 110 mg O₂ / l. By stripping with 1 t / h low-pressure saturated steam from line (27), the vapor condensate in the stripping column (26), which has 12 trays, is cleaned to a COD of 50 mg O₂ / l, so that it can be placed in a receiving water can. Via line (29), 1 t / h of contaminated stripping steam is withdrawn from the column with a COD of 3.37 g of O₂ / l and burned.
Claims (10)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4220953A DE4220953A1 (en) | 1992-06-26 | 1992-06-26 | Process for drying water-containing solids in a fluidized bed |
| DE4220953 | 1992-06-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0576053A1 true EP0576053A1 (en) | 1993-12-29 |
| EP0576053B1 EP0576053B1 (en) | 1996-01-31 |
Family
ID=6461871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93201455A Expired - Lifetime EP0576053B1 (en) | 1992-06-26 | 1993-05-21 | Process for drying aqueous solids in a fluidized bed |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5353517A (en) |
| EP (1) | EP0576053B1 (en) |
| AU (1) | AU659317B2 (en) |
| CA (1) | CA2097011A1 (en) |
| DE (2) | DE4220953A1 (en) |
| ES (1) | ES2085104T3 (en) |
| GR (1) | GR3019080T3 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10392575B2 (en) | 2015-05-26 | 2019-08-27 | General Electric Company | Lignite drying with closed loop heat pump |
| BE1027666A1 (en) | 2019-10-14 | 2021-05-07 | Thyssenkrupp Ind Solutions Ag | Cooler for cooling bulk goods |
| BE1027675A1 (en) | 2019-10-14 | 2021-05-07 | Thyssenkrupp Ind Solutions Ag | Cooler and method for cooling bulk goods |
| US12123650B2 (en) | 2019-10-14 | 2024-10-22 | thyssenkrupp Polysius GmbH | Cooler and a method for cooling bulk material |
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|---|---|---|---|---|
| AUPO546497A0 (en) * | 1997-03-05 | 1997-03-27 | Technological Resources Pty Limited | Process vessel and method of treating a charge of material |
| AUPO663297A0 (en) | 1997-05-07 | 1997-05-29 | Technological Resources Pty Limited | Enhanced heat transfer |
| KR100621713B1 (en) | 2000-09-26 | 2006-09-13 | 테크놀라지칼 리소시스 피티와이. 리미티드. | Quality improvement method and apparatus of solid material |
| DE10323774A1 (en) * | 2003-05-26 | 2004-12-16 | Khd Humboldt Wedag Ag | Process and plant for the thermal drying of a wet ground cement raw meal |
| CN100422677C (en) * | 2006-05-19 | 2008-10-01 | 登封电厂集团铝合金有限公司 | Pulverized coal drying process and apparatus |
| CN101693843B (en) * | 2009-10-27 | 2013-01-23 | 山东天力干燥股份有限公司 | Coal steam rotating moisture control process system and method thereof |
| CN103644709A (en) * | 2013-12-25 | 2014-03-19 | 山东奥诺能源科技有限公司 | Superheated steam drying device and method |
| CN104457210A (en) * | 2014-12-09 | 2015-03-25 | 成都丽雅纤维股份有限公司 | Drying condensate water recovery device |
| EP3098397A1 (en) | 2015-05-26 | 2016-11-30 | Alstom Technology Ltd | Lignite drying integration with a water/steam power cycle |
| EP3098509A1 (en) | 2015-05-26 | 2016-11-30 | Alstom Technology Ltd | Lignite drying in a lignite fired power plant with a heat pump |
| EP3098549B1 (en) | 2015-05-26 | 2018-07-11 | General Electric Technology GmbH | Lignite drying with a heat recovery circuit |
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- 1992-06-26 DE DE4220953A patent/DE4220953A1/en not_active Withdrawn
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- 1993-05-21 ES ES93201455T patent/ES2085104T3/en not_active Expired - Lifetime
- 1993-05-21 DE DE59301529T patent/DE59301529D1/en not_active Expired - Fee Related
- 1993-05-21 EP EP93201455A patent/EP0576053B1/en not_active Expired - Lifetime
- 1993-05-26 CA CA002097011A patent/CA2097011A1/en not_active Abandoned
- 1993-06-17 US US08/078,372 patent/US5353517A/en not_active Expired - Lifetime
- 1993-06-25 AU AU41494/93A patent/AU659317B2/en not_active Ceased
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1996
- 1996-02-22 GR GR960400489T patent/GR3019080T3/en unknown
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| US3258846A (en) * | 1963-05-01 | 1966-07-05 | Jr William Ward Powell | Drying of web materials |
| US3654705A (en) * | 1971-01-11 | 1972-04-11 | Combustion Power | Fluidized bed vapor compression drying apparatus and method |
| US4171243A (en) * | 1975-06-17 | 1979-10-16 | The Chemithon Corporation | Spray drying method |
| DE2837309A1 (en) * | 1978-08-26 | 1980-03-13 | Duerr Otto Anlagen Gmbh | Moving bed exhaust air purifier - in which air passes through pre-scrubber and cyclone before entering adsorber contg. continuously regenerated adsorbent |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10392575B2 (en) | 2015-05-26 | 2019-08-27 | General Electric Company | Lignite drying with closed loop heat pump |
| BE1027666A1 (en) | 2019-10-14 | 2021-05-07 | Thyssenkrupp Ind Solutions Ag | Cooler for cooling bulk goods |
| BE1027675A1 (en) | 2019-10-14 | 2021-05-07 | Thyssenkrupp Ind Solutions Ag | Cooler and method for cooling bulk goods |
| US12123650B2 (en) | 2019-10-14 | 2024-10-22 | thyssenkrupp Polysius GmbH | Cooler and a method for cooling bulk material |
Also Published As
| Publication number | Publication date |
|---|---|
| US5353517A (en) | 1994-10-11 |
| AU659317B2 (en) | 1995-05-11 |
| DE59301529D1 (en) | 1996-03-14 |
| CA2097011A1 (en) | 1993-12-27 |
| GR3019080T3 (en) | 1996-05-31 |
| DE4220953A1 (en) | 1994-01-05 |
| EP0576053B1 (en) | 1996-01-31 |
| ES2085104T3 (en) | 1996-05-16 |
| AU4149493A (en) | 1994-01-06 |
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