EP0593887A1 - Process for drying pasty material preferably in the form of pellets, especially sewage sludge and apparatus for carring out this process - Google Patents

Process for drying pasty material preferably in the form of pellets, especially sewage sludge and apparatus for carring out this process Download PDF

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Publication number
EP0593887A1
EP0593887A1 EP93114137A EP93114137A EP0593887A1 EP 0593887 A1 EP0593887 A1 EP 0593887A1 EP 93114137 A EP93114137 A EP 93114137A EP 93114137 A EP93114137 A EP 93114137A EP 0593887 A1 EP0593887 A1 EP 0593887A1
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Prior art keywords
dryer
process gas
gas
dehumidifier
moisture
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EP93114137A
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German (de)
French (fr)
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EP0593887B1 (en
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Andreas Dr.-Ing. Rutz
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Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves

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  • the invention relates to a method for drying pasty material, in particular sewage sludge, preferably in pelletized form, and a device for carrying out the method according to the preamble of patent claim 1.
  • a method for drying sewage sludge and a device for carrying it out is known from DE-OS 35 18 323. Thereafter, the liquid sewage sludge is converted into a pasty consistency by predrying, the pasty sewage sludge is then shaped into particles with a relatively large surface area and the particles are exposed to a drying gas stream.
  • the DE-OS does not specify any process parameters which lead to the advantageous result with regard to the residual moisture to be achieved of about 5% by weight, except for the reference to a low-temperature drying stream.
  • DE-OS 40 13 761 also describes a process for drying pasty and / or chunky material which, with reference to the process disclosed in the first-mentioned DE-OS, shows that if sewage sludge is dried by known methods, that is to say after the method according to DE-OS 35 18 323, then a large part of the additives contained in the sewage sludge is mobilized during drying, ie in other words, the additives evaporate from the material to be dried.
  • the aforementioned DE-OS is therefore not, as can be seen from the information given regarding the temperature of the dry gas stream, the use of a low-temperature dry gas stream, but rather a dry gas stream in the temperature range of approximately 348 K.
  • the object of the process described in DE-OS 40 13 761 is to separate only the water content from the sewage sludge to be dried, while the solids and additives are to remain in the dried material.
  • the object is to be achieved in that, by means of a drying gas flow, the material to be dried during the drying process at most reaches a temperature which is below the temperature at which the additives are released from the material into the atmosphere. 343 K is given as the preferred temperature of the material to be dried.
  • Condensate accumulates in the form of water during the course of the process. However, the conditions and circumstances that lead to the formation of condensate are not shown here.
  • the object of the invention is therefore to remove the water up to a residual moisture content of about 5% by weight at a process temperature which is essentially in pelletized form pasty material, in particular sewage sludge, which contains solids, water and additives Mobilization of the additives avoids, furthermore to remove the moisture from the process gas while avoiding a condensate accumulation in the form of polluted water and to exclude a pollution of the atmosphere with polluted and increased odor-laden plant exhaust air.
  • the preferably pelletized material which has a relatively high moisture content, For example, of about 80 wt .-%, in a through-flow dryer known per se by means of a dry process gas stream, the temperature of which is about 313 K - 323 K, that is below the mobilization temperature of the additives, water is withdrawn and taken up by the process gas becomes.
  • the process gas which is therefore loaded with a relatively high humidity, is fed from the dryer to a process gas dehumidifier within a closed circuit under conditions which correspond to the parameters of the dehumidifier with regard to the quantity supplied, relative humidity and temperature.
  • the water is extracted from the process gas and the dry process gas is fed to the dryer again.
  • the water bound in the gas dehumidifier is withdrawn with regeneration of a hygroscopic medium serving as a dehumidifier and, if necessary, released into the atmosphere free of pollutants via a deodorization device.
  • the regeneration gas used to regenerate the hygroscopic medium for example fresh air, is heated to approximately 493 K. This temperature specification is only an indication; it can vary more or less, depending on the conditions under which the regeneration of the hygroscopic medium is to be carried out.
  • the invention consists in the combination of a flow-through dryer, which is connected to a feed and pelletizing device and contains a conveyor belt designed as a sieve belt and a discharge device, with a process gas dehumidifier, which is integrated between the suction and pressure areas of the dryer, and wherein the process gas dehumidifier is integrated in a process circuit that is independent of the process gas circuit.
  • a process gas cycle for the material to be dried and a process cycle for the regeneration of the hygroscopic medium.
  • the invention will be explained in more detail below using an exemplary embodiment.
  • the example is based on a four-zone through-flow dryer with a drying area of 15 m2.
  • TS dry substance
  • the process diagram shown in the drawing shows the through-flow dryer 4 in combination with the process gas dehumidifier 18, which together form a closed circuit for process gas dehumidification. Furthermore, the gas dehumidifier 19 is integrated in a second process circuit which serves to regenerate the dehumidifying agent.
  • the figure shows a silo 1 for receiving the sewage sludge (material) 2, which has a dry substance (TS) of about 20% by weight.
  • the material 2 is fed via a pipeline 3 to a feed device, which is also a pelletizing device 4.
  • the pelletizing device engages sealingly in the first zone 6 of a through-flow dryer 5 consisting of several dryer zones 6 to 9.
  • the material 2 to be dried is fed into a sieve belt 10 which rotates endlessly within the dryer 5 in pellet form and is transported from the dryer zone 6 to the dryer zones 7 to 9 in a continuous process to a discharge device 11.
  • the dried material 2, which has a dry substance (TS) of 95% by weight, is fed into a silo 12 by means of the discharge device 11.
  • a conveying line 13 can be provided in order to connect the silo 12 receiving the dry material to the feed or pelletizing device 4.
  • the flow-through dryer 5 is designed such that the process gas stream 14, depending on the pressure conditions building up in the dryer, opposes the transport direction 15 of the material 2 to be dried and flows alternately from top to bottom through the individual dryer zones 9 to 6 and the sieve belt 10 and finally leaves the dryer in zone 6 as a process gas enriched with high humidity.
  • a fan 16 is assigned to each dryer zone 6 to 9 for a necessarily forced process gas transport. It has turned out to be advantageous if in the dryer zones in which the proportion of Dry matter (TS) in the material is about 20-30%, the process gas is preferably introduced below the sieve belt 10, while the process gas is introduced above the sieve belt in the subsequent dryer zones.
  • the process gas leaves the dryer 5 via the pipeline 17, which opens into the inlet of the known gas dehumidifier 19 by incorporating a filter 18.
  • the gas dehumidifier 19 the water is extracted from the process gas by means of adsorption.
  • the dry process gas which preferably has a temperature of approximately 323 K, is fed again to the dryer 5 via the pipeline 20, into which a fan 21 is integrated.
  • the gas dehumidifier 19 is also integrated into a second process circuit, a so-called regeneration circuit, which is independent of the process gas circuit.
  • Fresh air is sucked in by a fan 25 via the pipeline 22, the filter 23 and possibly a heat exchanger 24 and, if necessary, is fed via a heating device 26 to the gas dehumidifier 19 containing a hygroscopic medium.
  • the fresh air extracts the water from the gas dehumidifier 19 and thus regenerates the hygroscopic medium.
  • the regeneration air is released into the atmosphere free of pollutants via the pipeline 27, which may be connected to the above-mentioned heat exchanger 24, with the interposition of a deodorization device, not shown.
  • a control flap 28 is provided between pipe 17 and 20 for setting the dehumidifier to an optimal operating point, bypass flow.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Sludge (AREA)
  • Drying Of Solid Materials (AREA)
  • Drying Of Gases (AREA)

Abstract

The object is to remove the water from a pasty material, in particular sewage sludge, which contains solids, water and additives, down to a remaining residual moisture of about 5% by weight at a process gas temperature which is far below the mobilisation temperature of the additives, in addition to remove the moisture from the process gas, avoiding production of condensate in the form of polluted water, and to exclude pollution of the atmosphere with pollutant-containing plant air having a high degree of odour pollution. The solution is a drying process, according to which a process gas stream, enriched with moisture, is conducted within a first process circulation from a dryer to a gas dehumidifier, the process gas is dried by removal of moisture in the gas dehumidifier and the dried process gas is returned to the dryer, and, within a second process circulation, the moisture bound in the gas dehumidifier is removed. <IMAGE>

Description

Gegenstand der Erfindung ist ein Verfahren zum Trocknen von vorzugsweise in pelletierter Form vorliegenden pastösen Material, insbesondere Klärschlamm und eine Vorrichtung zur Durchführung des Verfahrens nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for drying pasty material, in particular sewage sludge, preferably in pelletized form, and a device for carrying out the method according to the preamble of patent claim 1.

Ein Verfahren zum Trocknen von Klärschlamm und eine Vorrichtung zu dessen Durchführung ist aus der DE-OS 35 18 323 bekannt. Hiernach wird der flüssige Klärschlamm durch Vortrocknen in eine pastöse Konsistenz umgewandelt, der pastöse Klärschlamm anschließend zu Partikeln mit einer relativ großen Oberfläche geformt und die Partikel einem Trocknungsgasstrom ausgesetzt. Die DE-OS gibt allerdings keine Prozeßparameter an, die zu dem vorteilhaften Ergebnis im Hinblick auf die zu erzielende Restfeuchte von etwa 5 Gew.-% führen, außer den Hinweis auf einen niedrigtemperierten Trocknungsstrom.A method for drying sewage sludge and a device for carrying it out is known from DE-OS 35 18 323. Thereafter, the liquid sewage sludge is converted into a pasty consistency by predrying, the pasty sewage sludge is then shaped into particles with a relatively large surface area and the particles are exposed to a drying gas stream. The DE-OS, however, does not specify any process parameters which lead to the advantageous result with regard to the residual moisture to be achieved of about 5% by weight, except for the reference to a low-temperature drying stream.

In der DE-OS 40 13 761 wird ebenfalls ein Verfahren zum Trocknen von pastösem und/oder brockigem Material beschrieben, das unter Bezugnahme auf das in der erstgenannten DE-OS offenbarte Verfahren aufzeigt, daß, wenn Klärschlamm nach bekannten Methoden getrocknet wird, also nach der Methode gemäß der DE-OS 35 18 323, dann ein Großteil der in dem Klärschlamm enthaltenen Zusatzstoffe bei der Trocknung mobilisiert wird, d.h. mit anderen Worten, die Zusatzstoffe dunsten aus dem zu trocknenden Material aus.
Bei der vorgenannten DE-OS dürfte es sich daher nicht, wie aus dem angegebenen Hinweis bezüglich der Temperatur des Trockengasstromes zu entnehmen ist, um die Verwendung eines niedrigtemperierten Trockengasstromes, sondern um einen Trockengasstrom im Temperaturbereich von etwa 348 K handeln.DE-OS 40 13 761 also describes a process for drying pasty and / or chunky material which, with reference to the process disclosed in the first-mentioned DE-OS, shows that if sewage sludge is dried by known methods, that is to say after the method according to DE-OS 35 18 323, then a large part of the additives contained in the sewage sludge is mobilized during drying, ie in other words, the additives evaporate from the material to be dried.
The aforementioned DE-OS is therefore not, as can be seen from the information given regarding the temperature of the dry gas stream, the use of a low-temperature dry gas stream, but rather a dry gas stream in the temperature range of approximately 348 K.

Dem in der DE-OS 40 13 761 beschriebenen Verfahren liegt die Aufgabe zugrunde, aus dem zu trocknenden Klärschlamm nur den Wasseranteil abzutrennen während die Feststoffe und die Zusatzstoffe in dem getrockneten Material verbleiben sollen.
Gelöst werden soll die Aufgabe dadurch, daß mittels eines Trockengasstromes das zu trocknende Material während des Trocknungsprozesses maximal eine Temperatur erreicht, die unter der Temperatur liegt, bei welcher die Zusatzstoffe aus dem Material in die Atmosphäre abgegeben werden. Als bevorzugte Temperatur des zu trocknenden Materials wird 343 K angegeben. Während des Verfahrensablaufs fällt Kondensat in Form von Wasser an. Nicht aufgezeigt sind hier allerdings die Bedingungen und Umstände, die zur Kondensatbildung führen.
Mit dem Verfahren ist ferner der Nachteil verbunden, daß das Wasser ebenfalls Schadstoffe enthält, die in einem weiteren Behandlungsprozeß dem Wasser z.B. in einem Klärwerk entzogen werden müssen.
Aufgabe der Erfindung ist es daher, einem im wesentlichen in pelletierter Form vorliegenden pastösen Material, insbesondere Klärschlamm, der Feststoffe, Wasser und Zusatzstoffe enthält, das Wasser bis zu einer verbleibenden Restfeuchte von etwa 5 Gew.-% bei einer Prozeßtemperatur zu entziehen, die eine Mobilisierung der Zusatzstoffe vermeidet, ferner dem Prozeßgas unter Vermeidung eines Kondensatanfalls in Form von schadstoffbelastetem Wasser die Feuchte zu entziehen und eine Belastung der Atmosphäre mit schadstoffhaltiger und erhöht geruchsbelasteter Anlagenabluft auszuschließen.The object of the process described in DE-OS 40 13 761 is to separate only the water content from the sewage sludge to be dried, while the solids and additives are to remain in the dried material.
The object is to be achieved in that, by means of a drying gas flow, the material to be dried during the drying process at most reaches a temperature which is below the temperature at which the additives are released from the material into the atmosphere. 343 K is given as the preferred temperature of the material to be dried. Condensate accumulates in the form of water during the course of the process. However, the conditions and circumstances that lead to the formation of condensate are not shown here.
Another disadvantage of the method is that the water also contains pollutants which have to be removed from the water in a further treatment process, for example in a sewage treatment plant.
The object of the invention is therefore to remove the water up to a residual moisture content of about 5% by weight at a process temperature which is essentially in pelletized form pasty material, in particular sewage sludge, which contains solids, water and additives Mobilization of the additives avoids, furthermore to remove the moisture from the process gas while avoiding a condensate accumulation in the form of polluted water and to exclude a pollution of the atmosphere with polluted and increased odor-laden plant exhaust air.

Erfindungsgemäß wird die Aufgabe nach den Merkmalen der Patentansprüche 1 und 3 gelöst. Vorteilhafte Ausbildung der Erfindungen sind in den Unteransprüchen und in dem Ausführungsbeispiel wiedergegeben.According to the invention the object is achieved according to the features of claims 1 and 3. Advantageous developments of the inventions are given in the subclaims and in the exemplary embodiment.

Wesentliche Merkmale der Erfindung sind, daß dem vorzugsweise pelletierten Material, welches einen relativ hohen Feuchtegehalt, z.B. von etwa 80 Gew.-% aufweist, in einem Durchström-Trockner an sich bekannter Bauart mittels eines trockenen Prozeßgasstromes, dessen Temperatur bei etwa 313 K - 323 K liegt, also sich unter der Mobilisierungstemperatur der Zusatzstoffe befindet, Wasser entzogen und vom Prozeßgas aufgenommen wird. Das daher mit einer relativ hohen Feuchte beladene Prozeßgas wird innerhalb eines geschlossenen Kreislaufs von dem Trockner einem Prozeßgasentfeuchter unter Bedingungen zugeführt, die den Parametern des Entfeuchters hinsichtlich zugeführter Menge, relativer Feuchte und Temperatur entsprechen. In dem Gasentfeuchter wird dem Prozeßgas das Wasser entzogen und das trockene Prozeßgas erneut dem Trockner zugeleitet.Essential features of the invention are that the preferably pelletized material, which has a relatively high moisture content, For example, of about 80 wt .-%, in a through-flow dryer known per se by means of a dry process gas stream, the temperature of which is about 313 K - 323 K, that is below the mobilization temperature of the additives, water is withdrawn and taken up by the process gas becomes. The process gas, which is therefore loaded with a relatively high humidity, is fed from the dryer to a process gas dehumidifier within a closed circuit under conditions which correspond to the parameters of the dehumidifier with regard to the quantity supplied, relative humidity and temperature. In the gas dehumidifier, the water is extracted from the process gas and the dry process gas is fed to the dryer again.

In einem zweiten, vom Prozeßgaskreislauf unabhängigen Prozeßkreislauf, wird das im Gasentfeuchter gebundene Wasser unter Regenerierung eines als Entfeuchter dienenden hygroskopischen Mediums entzogen und ggf. über eine Desodoriereinrichtung schadstofffrei an die Atmosphäre abgegeben.
Es ist zweckmäßig, daß das zur Regenerierung des hygroskopischen Mediums dienende Regenerationsgas z.B. Frischluft auf etwa 493 K erhitzt wird. Diese Temperaturangabe stellt nur einen Anhaltspunkt dar; sie kann mehr oder weniger abweichen, je nach dem unter welchen Bedingungen die Regenerierung des hygroskopischen Mediums vollzogen werden soll.In a second process circuit which is independent of the process gas circuit, the water bound in the gas dehumidifier is withdrawn with regeneration of a hygroscopic medium serving as a dehumidifier and, if necessary, released into the atmosphere free of pollutants via a deodorization device.
It is expedient that the regeneration gas used to regenerate the hygroscopic medium, for example fresh air, is heated to approximately 493 K. This temperature specification is only an indication; it can vary more or less, depending on the conditions under which the regeneration of the hygroscopic medium is to be carried out.

Vorrichtungsseitig besteht die Erfindung in der Kombination eines Durchström-Trockners, der mit einer Zuführ- und Pelletiervorrichtung in Verbindung steht und ein als Siebband ausgebildetes Transportband und eine Austragvorrichtung beinhaltet, mit einem Prozeßgasentfeuchter, der zwischen den Saug- und Druckbereichen des Trockners eingebunden ist, und wobei der Prozeßgasentfeuchter in einen vom Prozeßgaskreislauf unabhängigen Prozeßkreislauf eingebunden ist. Von Bedeutung ist vorrichtungsseitig ferner, daß die Trockneranlage neben den vorgenannten Kombinationsmerkmalen als weitere erfindungswesentliche Merkmale einen Prozeßgaskreislauf für das zu trocknende Material und einen Prozeßkreislauf zur Regenerierung des hygroskopischen Mediums beinhaltet.On the device side, the invention consists in the combination of a flow-through dryer, which is connected to a feed and pelletizing device and contains a conveyor belt designed as a sieve belt and a discharge device, with a process gas dehumidifier, which is integrated between the suction and pressure areas of the dryer, and wherein the process gas dehumidifier is integrated in a process circuit that is independent of the process gas circuit. On the device side, it is also important that the dryer system in addition to the The aforementioned combination features include, as further features essential to the invention, a process gas cycle for the material to be dried and a process cycle for the regeneration of the hygroscopic medium.

Mit der erfindungsgemäß gelösten Aufgabe werden folgende vorteilhafte Wirkungen erzielt:

  • Die niedrige Prozeßtemperatur führt zur schonenden Behandlung des Trockengutes, d.h. es erfolgt keine Mobilisierung der Zusatzstoffe; es entsteht keine auf den Trocknungsprozeß zurückzuführende zusätzliche unangenehme Geruchsentwicklung; daher ist eine Abluftbehandlung wie z.B. der Einsatz von Biowäschern überflüssig,
  • Das Verfahren ist für Trockner unterschiedlichster Dimensionen geeignet, vornehmlich für den Einsatz in Verbindung mit Kläranlagen in Kommunen mit geringer Einwohnerzahl,
  • Eine Explosionsgefahr durch Staubentwicklung ist ausgeschlossen.
The following advantageous effects are achieved with the object achieved according to the invention:
  • The low process temperature leads to gentle treatment of the dry material, ie there is no mobilization of the additives; there is no additional unpleasant odor development due to the drying process; therefore an exhaust air treatment such as the use of organic washers is superfluous,
  • The process is suitable for dryers of various dimensions, primarily for use in connection with sewage treatment plants in municipalities with a small population,
  • An explosion risk due to dust formation is excluded.

Die Erfindung soll nachstehend anhand eines Ausführungsbeispiels näher erläutert werden.
Dem Beispiel liegt ein Vier-Zonen-Durchström-Trockner mit einer Trockenfläche von 15 m² zugrunde. Im einzelnen wurden folgende Prozeßergebnisse bei einem zu trocknendem Material mit einer Trockensubstanz (TS) von 20 Gew.-% erzielt:
   Der Materialdurchsatz betrug 320 Kg/h. Der Wasserentzug betrug bei einer Prozeßgastemperatur am Trocknereintritt von etwa 323 K und am Trockneraustritt von etwa 303 K ca. 254 Kg/h. Nach dem Verlassen des Trockners wies das Material eine Trokkensubstanz (TS) von 95 Gew.-% auf.The invention will be explained in more detail below using an exemplary embodiment.
The example is based on a four-zone through-flow dryer with a drying area of 15 m². In detail, the following process results were achieved with a material to be dried with a dry substance (TS) of 20% by weight:
The material throughput was 320 kg / h. With a process gas temperature at the dryer inlet of approximately 323 K and at the dryer outlet of approximately 303 K, the water removal was approximately 254 Kg / h. After leaving the dryer, the material had a dry matter (TS) of 95% by weight.

Das in der Zeichnung dargestellte Prozeßschaubild zeigt den Durchström-Trockner 4 in Kombination mit dem Prozeßgasentfeuchter 18, die zusammen zur Prozeßgasentfeuchtung einen geschlossenen Kreislauf bilden. Des weiteren ist in einem zweiten Prozeßkreislauf, der der Regenerierung des Entfeuchtemittels dient, der Gasentfeuchter 19 eingebunden.The process diagram shown in the drawing shows the through-flow dryer 4 in combination with the process gas dehumidifier 18, which together form a closed circuit for process gas dehumidification. Furthermore, the gas dehumidifier 19 is integrated in a second process circuit which serves to regenerate the dehumidifying agent.

Die Figur zeigt einen Silo 1 zur Aufnahme des eine Trockensubstanz (TS) von etwa 20 Gew.-% aufweisenden Klärschlamms (Material) 2. Über eine Rohrleitung 3 wird das Material 2 einer Zuführ-, die zugleich Pelletiervorrichtung 4 ist, zugeführt. Die Pelletiervorrichtung greift abdichtend in die erste Zone 6 eines aus mehreren Trocknerzonen 6 bis 9 bestehenden Durchström-Trockners 5 ein. Das zu trocknende Material 2 wird einem innerhalb des Trockners 5 endlos umlaufenden Siebbandes 10 in pelletierter Form aufgegeben und von der Trocknerzone 6 zu den Trocknerzonen 7 bis 9 im Durchlaufverfahren bis zu einer Austragsvorrichtung 11 transportiert. Das getrocknete, eine Trockensubstanz (TS) von 95 Gew.-% aufweisende Material 2 wird mittels der Austragsvorrichtung 11 einem Silo 12 aufgegeben.
Eine Förderleitung 13 kann vorgesehen sein, um den das trockene Material aufnehmenden Silo 12 mit der Zuführ- oder Pelletiervorrichtung 4 zu verbinden.The figure shows a silo 1 for receiving the sewage sludge (material) 2, which has a dry substance (TS) of about 20% by weight. The material 2 is fed via a pipeline 3 to a feed device, which is also a pelletizing device 4. The pelletizing device engages sealingly in the first zone 6 of a through-flow dryer 5 consisting of several dryer zones 6 to 9. The material 2 to be dried is fed into a sieve belt 10 which rotates endlessly within the dryer 5 in pellet form and is transported from the dryer zone 6 to the dryer zones 7 to 9 in a continuous process to a discharge device 11. The dried material 2, which has a dry substance (TS) of 95% by weight, is fed into a silo 12 by means of the discharge device 11.
A conveying line 13 can be provided in order to connect the silo 12 receiving the dry material to the feed or pelletizing device 4.

Der Durchström-Trockner 5 ist derart ausgebildet, daß der Prozeßgasstrom 14 vorzugsweise in Abhängigkeit von den sich im Trockner aufbauenden Druckverhältnissen der Transportrichtung 15 des zu trocknenden Materials 2 entgegengesetzt und abwechselnd von oben nach unten die einzelnen Trocknerzonen 9 bis 6 und das Siebband 10 durchströmt und schließlich den Trockner in der Zone 6 als mit hoher Feuchtigkeit angereichertes Prozeßgas verläßt. Für einen notwendigerweise zwangsweisen Prozeßgastransport ist jeder Trocknerzone 6 bis 9 ein Ventilator 16 zugeordnet. Als Vorteilhaft hat sich herausgestellt, wenn in den Trocknerzonen, in denen der Anteil an Trockensubstanz (TS) im Material bei etwa 20-30 % liegt, das Prozeßgas vorzugsweise unterhalb des Siebbandes 10 eingebracht wird, während in den nachfolgenden Trocknerzonen das Prozeßgas oberhalb des Siebbandes eingebracht wird.
Ferner hat sich als vorteilhaft erwiesen, wenn der sich während des Trocknungsprozesses einstellende Differenzdruck zwischen der Saug- und Druckseite der Trocknerzonen optimierbar ist.
Das Prozeßgas verläßt den Trockner 5 über die Rohrleitung 17, die unter Einbindung eines Filters 18 in den Eingang des bekannten Gasentfeuchters 19 mündet.
Im Gasentfeuchter 19 wird dem Prozeßgas mittels Adsorption das Wasser entzogen. Über die Rohrleitung 20, in die ein Ventilator 21 eingebunden ist, wird das trockene, vorzugsweise eine Temperatur von etwa 323 K aufweisende Prozeßgas dem Trockner 5 erneut zugeführt.
Der Gasentfeuchter 19 ist ferner in einen zweiten, vom Prozeßgaskreislauf unabhängigen Prozeßkreislauf, einen sogenannten Regenerationskreislauf eingebunden. Über die Rohrleitung 22, den Filter 23 und ggf. einen Wärmetauscher 24 wird von einem Ventilator 25 Frischluft angesogen und ggf. über eine Heizeinrichtung 26 dem ein hygroskopisches Medium beinhaltenden Gasentfeuchter 19 zugeführt. Die Frischluft entzieht dem Gasentfeuchter 19 das Wasser und regeneriert damit das hygroskopische Medium. Die Regenerationsluft wird über die Rohrleitung 27, die ggf. mit dem vorstehend erwähnten Wärmetauscher 24 in Verbindung steht, unter Zwischenschaltung einer nicht dargestellten Desodoriereinrichtung schadstofffrei an die Atmosphäre abgegeben. Parallel zum Gasentfeuchter ist zwischen Rohrleitung 17 und 20 eine Regelklappe 28 zur Einstellung des Luftentfeuchters auf einen optimalen Betriebspunkt, Bypassstrom vorgesehen.The flow-through dryer 5 is designed such that the process gas stream 14, depending on the pressure conditions building up in the dryer, opposes the transport direction 15 of the material 2 to be dried and flows alternately from top to bottom through the individual dryer zones 9 to 6 and the sieve belt 10 and finally leaves the dryer in zone 6 as a process gas enriched with high humidity. A fan 16 is assigned to each dryer zone 6 to 9 for a necessarily forced process gas transport. It has turned out to be advantageous if in the dryer zones in which the proportion of Dry matter (TS) in the material is about 20-30%, the process gas is preferably introduced below the sieve belt 10, while the process gas is introduced above the sieve belt in the subsequent dryer zones.
It has also proven to be advantageous if the differential pressure between the suction and pressure sides of the dryer zones that arises during the drying process can be optimized.
The process gas leaves the dryer 5 via the pipeline 17, which opens into the inlet of the known gas dehumidifier 19 by incorporating a filter 18.
In the gas dehumidifier 19 the water is extracted from the process gas by means of adsorption. The dry process gas, which preferably has a temperature of approximately 323 K, is fed again to the dryer 5 via the pipeline 20, into which a fan 21 is integrated.
The gas dehumidifier 19 is also integrated into a second process circuit, a so-called regeneration circuit, which is independent of the process gas circuit. Fresh air is sucked in by a fan 25 via the pipeline 22, the filter 23 and possibly a heat exchanger 24 and, if necessary, is fed via a heating device 26 to the gas dehumidifier 19 containing a hygroscopic medium. The fresh air extracts the water from the gas dehumidifier 19 and thus regenerates the hygroscopic medium. The regeneration air is released into the atmosphere free of pollutants via the pipeline 27, which may be connected to the above-mentioned heat exchanger 24, with the interposition of a deodorization device, not shown. In parallel to the gas dehumidifier, a control flap 28 is provided between pipe 17 and 20 for setting the dehumidifier to an optimal operating point, bypass flow.

ZEICHNUNGS-LEGENDEDRAWING LEGEND

11
Silosilo
22nd
Klärschlamm (Material)Sewage sludge (material)
33rd
RohrleitungPipeline
44th
Zuführ-PelletiervorrichtungFeed pelletizer
55
Durchström-TrocknerFlow dryer
66
TrocknerzoneDryer zone
77
TrocknerzoneDryer zone
88th
TrocknerzoneDryer zone
99
TrocknerzoneDryer zone
1010th
SiebbandScreen belt
1111
AustragsvorrichtungDischarge device
1212th
Silosilo
1313
FörderleitungConveyor line
1414
ProzeßgasstromProcess gas stream
1515
TransportrichtungDirection of transport
1616
Ventilatorfan
1717th
RohrleitungPipeline
1818th
Filterfilter
1919th
GasentfeuchterGas dehumidifier
2020th
RohrleitungPipeline
2121
Ventilatorfan
2222
RohrleitungPipeline
2323
Filterfilter
2424th
WärmetauscherHeat exchanger
2525th
Ventilatorfan
2626
HeizeinrichtungHeating device
2727
Rohrleitung 28 RegelklappePipe 28 control flap

Claims (6)

Verfahren zum Trocknen von in pelletierter Form vorliegendem pastösem Materials, insbesondere Klärschlamm, wonach das aus Feststoffen, Wasser und Zusatzstoffen bestehende Material auf eine Fördereinrichtung aufgebracht wird, die innerhalb eines aus mehreren Trocknerzonen bestehenden Trockners installiert ist und das Material durch den Trockner bei gleichzeitigem Umspülen des Materials mittels eines trockenen, unter der Mobilisierungstemperatur der Zusatzstoffe liegenden Prozeßgasstromes hindurchgeführt wird, um dem Material die Feuchte bis zu einer verbleibenden Restfeuchte zu entziehen, dadurch gekennzeichnet, daß der mit Feuchtigkeit angereicherte Prozeßgasstrom innerhalb eines ersten Prozeßkreislaufs, vom Trockner zu einem Gasentfeuchter geführt, in dem Gasentfeuchter das Prozeßgas durch Feuchteentzug getrocknet und das trockene Prozeßgas erneut dem Trockner zugeleitet wird, und daß innerhalb eines zweiten Prozeßkreislaufs die im Gasentfeuchter gebundene Feuchtigkeit entzogen wird.Process for drying pasty material, in particular sewage sludge, in pelletized form, according to which the material consisting of solids, water and additives is applied to a conveying device which is installed within a dryer consisting of several dryer zones and the material is washed through the dryer while simultaneously rinsing the Material is passed through a dry process gas stream below the mobilization temperature of the additives in order to extract the moisture from the material to a remaining residual moisture, characterized in that the process gas stream enriched with moisture is led from the dryer to a gas dehumidifier within a first process cycle the process gas is dried by dehumidification of the gas dehumidifier and the dry process gas is fed again to the dryer, and that within a second process cycle the moisture bound in the gas dehumidifier is withdrawn. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in den Trocknerzonen, in denen der Anteil an Trockensubstanz (TS) im Material bei etwa 20-30 % liegt, das Prozeßgas unterhalb der Fördereinrichtung in den Trockner störmt, während in den nachfolgenden Trocknerzonen das Prozeßgas oberhalb der Fördereinrichtung eingebracht wird.A method according to claim 1, characterized in that in the dryer zones, in which the proportion of dry substance (TS) in the material is about 20-30%, the process gas below the conveyor interferes with the dryer, while in the subsequent dryer zones the process gas above the conveyor is introduced. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der sich beim Trocknen einstellende Differenzdruck zwischen der Saug- und Druckseite (Aus- und Eintritt) des Trockners optimierbar ist.Method according to claim 1, characterized in that the differential pressure which arises during drying between the suction and pressure sides (outlet and inlet) of the dryer can be optimized. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das dem Gasentfeuchter zugeführte Prozeßgas den Prozeßvoraussetzungen des Gasentfeuchters, z.B. hinsichtlich der relativen Feuchte, der Prozeßgasmenge und der Temperatur entspricht.Method according to Claim 1, characterized in that the process gas supplied to the gas dehumidifier corresponds to the process requirements of the gas dehumidifier, for example with regard to the relative humidity, the amount of process gas and the temperature. Trockner zur Durchführung des Verfahrens nach Anspruch 1, gekennzeichnet durch die Kombination eines Durchström-Trockners (5), der mit einer Zuführ- und Pelletiervorrichtung (4) in Verbindung steht und Trocknerzonen (6 bis 9) mit Ventilatoren (16), ein als Siebband (10) ausgebildetes Transportband und eine Austragsvorrichtung (11) beinhaltet, mit einem Prozeßgasentfeuchter (19), der zwischen dem Prozeßgasaus-und -eintritt (Rohrleitung 17 und Rohrleitung 20) des Trockners (5) eingebunden ist, und wobei der Prozeßgasentfeuchter (19) ferner mit dem zweiten Prozeßkreislauf in Verbindung steht, in welchem die im Gasentfeuchter (19) gebundene Feuchtigkeit entzogen wird.Dryer for carrying out the method according to claim 1, characterized by the combination of a through-flow dryer (5) which is connected to a feed and pelletizing device (4) and dryer zones (6 to 9) with fans (16), one as a screen belt (10) formed conveyor belt and a discharge device (11), with a process gas dehumidifier (19), which is integrated between the process gas outlet and inlet (pipe 17 and pipe 20) of the dryer (5), and wherein the process gas dehumidifier (19) is also connected to the second process circuit in which the moisture bound in the gas dehumidifier (19) is removed. Trockner nach Anspruch 5, dadurch gekennzeichnet, daß der Durchström-Trockner (5) und der Gasentfeuchter (19) einen ersten Prozeßgaskreislauf bilden und in dem zweiten Prozeßkreislauf, der von dem ersten Prozeßgaskreislauf unabhängigen ist, der Gasentfeuchter (19) zur Regeneration eines die Prozeßgasentfeuchtung bewirkenden hygroskopischen Mediums eingebunden ist.Dryer according to claim 5, characterized in that the flow dryer (5) and the gas dehumidifier (19) form a first process gas circuit and in the second process circuit, which is independent of the first process gas circuit, the gas dehumidifier (19) for the regeneration of the process gas dehumidification effecting hygroscopic medium is involved.
EP93114137A 1992-10-21 1993-09-03 Process for drying pasty material preferably in the form of pellets, especially sewage sludge and apparatus for carring out this process Expired - Lifetime EP0593887B1 (en)

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DE4235422 1992-10-21
DE4235422A DE4235422C2 (en) 1992-10-21 1992-10-21 Process for drying pasty material, in particular sewage sludge, preferably in pellet form, and device for carrying out the process

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EP0593887B1 EP0593887B1 (en) 1997-03-12

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DE10005165A1 (en) * 2000-02-08 2001-08-16 Netzsch Erich Holding Method and device for drying pre-dewatered liquid to moist substances
DE10058191A1 (en) * 2000-11-23 2002-07-11 Baker Hughes De Gmbh Process and plant for producing storage-stable pellets from sewage sludge
EP2940414A1 (en) * 2014-04-29 2015-11-04 ESG Kräuter GmbH Method and device for drying plant products
CN109668413A (en) * 2019-01-24 2019-04-23 老梁（贵安新区）科技有限公司 A kind of brick plane circulation drying device and drying means

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US20190041134A1 (en) * 2016-02-01 2019-02-07 Stela Laxhuber Gmbh Continuous flow dryer having at least two sections
CN109574456A (en) * 2019-01-30 2019-04-05 南通联振重工机械有限公司 A kind of sludge homogenizes the pulp processing equipment that can quickly heat
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EP0901808A2 (en) * 1997-09-11 1999-03-17 Lindauer Dornier Gesellschaft M.B.H Process and apparatus for treating exhaust air from thermal drying processes
EP0901808A3 (en) * 1997-09-11 1999-08-04 Lindauer Dornier Gesellschaft M.B.H Process and apparatus for treating exhaust air from thermal drying processes
US6101739A (en) * 1997-09-11 2000-08-15 Lindauer Dornier Gesellschaft Method and apparatus for treating exhaust gases of thermal drying processes and particularly processes for drying sewage sludge
DE10005165A1 (en) * 2000-02-08 2001-08-16 Netzsch Erich Holding Method and device for drying pre-dewatered liquid to moist substances
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DE10058191A1 (en) * 2000-11-23 2002-07-11 Baker Hughes De Gmbh Process and plant for producing storage-stable pellets from sewage sludge
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EP2940414A1 (en) * 2014-04-29 2015-11-04 ESG Kräuter GmbH Method and device for drying plant products
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CN109668413A (en) * 2019-01-24 2019-04-23 老梁（贵安新区）科技有限公司 A kind of brick plane circulation drying device and drying means

Also Published As

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US5428904A (en) 1995-07-04
JPH06234000A (en) 1994-08-23
JP3039780U (en) 1997-07-31
DE4235422C2 (en) 1997-01-23
ATE149974T1 (en) 1997-03-15
EP0593887B1 (en) 1997-03-12
DE4235422A1 (en) 1994-04-28
DE59305728D1 (en) 1997-04-17

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