EP0593887B1 - Verfahren zum Trocknen von vorzugsweise in pelletierter Form vorliegenden pastösen Material, insbesondere Klärschlamm und Vorrichtung zur Durchführung des Verfahrens. - Google Patents

Verfahren zum Trocknen von vorzugsweise in pelletierter Form vorliegenden pastösen Material, insbesondere Klärschlamm und Vorrichtung zur Durchführung des Verfahrens. Download PDF

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Publication number
EP0593887B1
EP0593887B1 EP93114137A EP93114137A EP0593887B1 EP 0593887 B1 EP0593887 B1 EP 0593887B1 EP 93114137 A EP93114137 A EP 93114137A EP 93114137 A EP93114137 A EP 93114137A EP 0593887 B1 EP0593887 B1 EP 0593887B1
Authority
EP
European Patent Office
Prior art keywords
dryer
gas
process gas
moisture
dehumidifier
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.)
Expired - Lifetime
Application number
EP93114137A
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German (de)
English (en)
French (fr)
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EP0593887A1 (de
Inventor
Andreas Dr.-Ing. Rutz
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.)
Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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Publication date
Application filed by Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP0593887A1 publication Critical patent/EP0593887A1/de
Application granted granted Critical
Publication of EP0593887B1 publication Critical patent/EP0593887B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • 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 m 2 .
  • 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.

Landscapes

  • 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)
EP93114137A 1992-10-21 1993-09-03 Verfahren zum Trocknen von vorzugsweise in pelletierter Form vorliegenden pastösen Material, insbesondere Klärschlamm und Vorrichtung zur Durchführung des Verfahrens. Expired - Lifetime EP0593887B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4235422A DE4235422C2 (de) 1992-10-21 1992-10-21 Verfahren zum Trocknen von vorzugsweise in pelletierter Form vorliegenden pastösen Material, insbesondere Klärschlamm und Vorrichtung zur Durchführung des Verfahrens
DE4235422 1992-10-21

Publications (2)

Publication Number Publication Date
EP0593887A1 EP0593887A1 (de) 1994-04-27
EP0593887B1 true EP0593887B1 (de) 1997-03-12

Family

ID=6470940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93114137A Expired - Lifetime EP0593887B1 (de) 1992-10-21 1993-09-03 Verfahren zum Trocknen von vorzugsweise in pelletierter Form vorliegenden pastösen Material, insbesondere Klärschlamm und Vorrichtung zur Durchführung des Verfahrens.

Country Status (5)

Country Link
US (1) US5428904A (ja)
EP (1) EP0593887B1 (ja)
JP (2) JPH06234000A (ja)
AT (1) ATE149974T1 (ja)
DE (2) DE4235422C2 (ja)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996001232A1 (de) * 1994-07-04 1996-01-18 Andreas Christian Wegier Anlage zum trocknen von schlamm
DE19641201C2 (de) * 1996-09-25 2002-05-08 Cornelia Baldauf Verfahren zur kontinuierlichen Trocknung von Klärschlamm
AU7420298A (en) 1997-05-09 1998-12-08 Solutions Mabarex Inc. Method for reducing moisture content
ATE247811T1 (de) * 1997-08-25 2003-09-15 Tilo Dr Conrad Wendevorrichtung für schlämme und dispersionen und solartrockner mit wendevorrichtung
DE19739864A1 (de) * 1997-09-11 1999-03-18 Dornier Gmbh Lindauer Verfahren zur Behandlung der Abluft aus thermischen Trocknungsprozessen, insbesondere aus Prozessen beim Trocknen von Klärschlamm in Klärschlamm-Trocknern und Anlage zur Verfahrensdurchführung
JP3845236B2 (ja) * 1999-11-22 2006-11-15 富士写真フイルム株式会社 乾燥装置
DE10005165B4 (de) * 2000-02-08 2005-02-24 Erich Netzsch Gmbh & Co Holding Kg Verfahren und Vorrichtung zum Trocknen vorentwässerter flüssiger bis feuchter Substanzen
DE10058191A1 (de) 2000-11-23 2002-07-11 Baker Hughes De Gmbh Verfahren und Anlage zur Herstellung lagerbeständiger Pellets aus Klärschlamm
US6487790B2 (en) * 2001-03-29 2002-12-03 Pasquale Damiani Apparatus for continuously drying unpackaged food products, in particular vegetables
NL1019895C2 (nl) * 2002-02-04 2003-08-05 Bioone Holding B V Werkwijze voor het drogen van mest, drijfmest, industrieel effluent, slib en andere te drogen mengsels of (rest-)stoffen en een inrichting daartoe.
AT412277B (de) 2003-04-30 2004-12-27 Armin Vonplon Verfahren und vorrichtung zum kontinuierlichen trocknen von gut, insbesondere klärschlamm
CN100453922C (zh) * 2004-04-09 2009-01-21 松下电器产业株式会社 干燥装置
DE102005017152B4 (de) * 2005-04-13 2007-02-08 Lindauer Dornier Gmbh Verfahren zum Trocknen von vorzugsweise plattenförmigen Produkten und Durchlauftrockner in Mehretagenbauweise
DE102005017187B4 (de) * 2005-04-13 2007-06-21 Lindauer Dornier Gmbh Durchlauftrockner in Mehretagenbauweise, insbesondere für plattenförmige Produkte
CN100439269C (zh) * 2005-06-21 2008-12-03 中国科学院工程热物理研究所 复合干燥器
ES2552720T3 (es) * 2012-04-13 2015-12-01 Sociedad General De Aguas De Barcelona, S.A. Secador de múltiples productos de bandas para materiales pastosos y/o pulverulentos, en particular para lodos de estación de depuración o biomasa
RS56647B1 (sr) * 2014-04-29 2018-03-30 Esg Kraeuter Gmbh Postupak i uređaj za sušenje biljnih proizvoda
CA3013083C (en) * 2016-02-01 2024-05-28 Stela Laxhuber Gmbh Continuous flow dryer having at least two sections
CN109668413A (zh) * 2019-01-24 2019-04-23 老梁（贵安新区）科技有限公司 一种砖块平面循环干燥装置及干燥方法
CN109574456A (zh) * 2019-01-30 2019-04-05 南通联振重工机械有限公司 一种污泥均质化可快速加热的浆化处理设备
JP7273535B2 (ja) * 2019-02-21 2023-05-15 株式会社ディスコ スラッジ乾燥装置
CN115854667B (zh) * 2022-12-05 2024-03-12 深圳快造科技有限公司 干燥箱及干燥系统

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US3314159A (en) * 1964-05-18 1967-04-18 Universal Oil Prod Co Fume treating system for a drying oven
US3470708A (en) * 1967-10-12 1969-10-07 Inst Gas Technology Solid-adsorbent air-conditioning device
US3488971A (en) * 1968-04-29 1970-01-13 Gershon Meckler Comfort conditioning system
US3844737A (en) * 1970-03-31 1974-10-29 Gas Dev Corp Desiccant system for an open cycle air-conditioning system
US3705461A (en) * 1970-09-24 1972-12-12 Ralph C Parkes Dryer damper and control mechanism
JPS5810900B2 (ja) * 1975-07-24 1983-02-28 株式会社東芝 フアクシミリジユシンキニオケル イソウサイセイゴウホウシキ
JPS5232165A (en) * 1975-09-05 1977-03-11 Nisshin Steel Co Ltd Dehydrating and drying method of wet dust and device therefore
IT1108191B (it) * 1978-12-12 1985-12-02 Fasano Pietro Essicatoio a portata d'aria con temperatura variabile e suo ricupero specialmente per cereali
CH644683A5 (de) * 1979-05-28 1984-08-15 Escher Wyss Ag Verfahren zur thermischen behandlung einer materialschicht.
US4509272A (en) * 1981-03-20 1985-04-09 Graeff Roderich Wilhelm Method and apparatus for drying moist exhaust air from one or more bulk material drying hoppers
DE3518323A1 (de) * 1985-05-22 1986-11-27 SEVAR Entsorgungsanlagen GmbH, 8590 Marktredwitz Verfahren und vorrichtung zum trocknen von klaerschlamm
US4653199A (en) * 1985-10-21 1987-03-31 Thoreson-Mccosh, Incorporated Hot air dryer with multiple desiccant cartridges
DE3625013C2 (de) * 1986-07-24 1995-05-24 Somos Gmbh Verfahren und Vorrichtung zum Trocknen von Schüttgut vorzugsweise aus Kunststoffgranulat
SE458804B (sv) * 1988-05-02 1989-05-08 Flaekt Ab Saett att reglera till- och bortfoerseln av varmluft till resp fraan en blaastunnel
DE3923020A1 (de) * 1989-07-12 1991-01-17 Bayerische Motoren Werke Ag Verfahren zum entsorgen von klebenden schlaemmen
DE4013761C2 (de) * 1990-04-28 1994-11-24 Sevar Entsorgung Verfahren zum Trocknen von pastösem und/oder brockigem Material
DE4016100A1 (de) * 1990-05-18 1991-11-21 Licencia Holding Sa Verfahren und einrichtung zum trocknen von klaerschlamm
US5038498A (en) * 1990-06-04 1991-08-13 Rick Woolsey Bulk material dryer

Also Published As

Publication number Publication date
DE59305728D1 (de) 1997-04-17
DE4235422C2 (de) 1997-01-23
US5428904A (en) 1995-07-04
ATE149974T1 (de) 1997-03-15
DE4235422A1 (de) 1994-04-28
EP0593887A1 (de) 1994-04-27
JPH06234000A (ja) 1994-08-23
JP3039780U (ja) 1997-07-31

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