EP0588152A1 - Procédé pour le séchage continu de boues d'épuration - Google Patents

Procédé pour le séchage continu de boues d'épuration Download PDF

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Publication number
EP0588152A1
EP0588152A1 EP93113970A EP93113970A EP0588152A1 EP 0588152 A1 EP0588152 A1 EP 0588152A1 EP 93113970 A EP93113970 A EP 93113970A EP 93113970 A EP93113970 A EP 93113970A EP 0588152 A1 EP0588152 A1 EP 0588152A1
Authority
EP
European Patent Office
Prior art keywords
sewage sludge
weight
paddle screw
paddle
dryer
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.)
Withdrawn
Application number
EP93113970A
Other languages
German (de)
English (en)
Inventor
Clemens Dr. Casper
Wilfried Dipl.-Ing. Heidemann
Hanno Dr. Henkel
Jörgen Dipl.-Ing. Weinschenck
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.)
Bayer AG
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0588152A1 publication Critical patent/EP0588152A1/fr
Withdrawn legal-status Critical Current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
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined

Definitions

  • the invention relates to a method for the thermal drying of sewage sludge using a dryer with rotating internals.
  • a large number of devices and methods for sewage sludge drying are described in the literature. An overview can be found e.g. in the article by Prof. U. Möller, Abwassertechnik, Issue 1, pages 12-18, 1991. Continuous processes are mainly carried out in rotary tube dryers, screw machines, disk dryers or thin-layer dryers.
  • the sewage sludge passes through a sticky viscous phase in the range from 40 to 60% by weight of solid, which is also referred to as the glue phase. In this glue phase, the product tends to cake and lumps, so that drying is difficult and critical operating conditions can occur.
  • part of the dried solid is usually branched off at the end of the dryer, returned and mixed with the incoming sewage sludge paste, so that the solids content in the drying apparatus is always above the critical composition of the glue phase.
  • Another problem is that water evaporation in sewage sludge is hindered due to the closed cells of the biomass. To remove the bound water, the cells must first be broken up.
  • the invention has for its object to develop a continuously operating process for thermal sewage sludge drying, which allows a reduction in equipment costs without lowering the energy balance (lower investment costs).
  • This object is achieved in that a mechanically dewatered to 15 to 30 wt .-% sewage sludge in a single pass continuously through a self-cleaning paddle screw dryer with oppositely rotating shafts at a speed of 100 to 600 min ⁇ 1, at which the waves are equipped with paddle elements with an angle of attack of 5 ° to 20 ° in such a way that a grinding gap of 1 to 10 mm is formed in the axial direction, in which the sewage sludge is broken up and the capillary cells are broken open, and that the dryer performance and the residence time in the paddle screw dryer are included a heating medium temperature of 200 to 300 ° C so that the sewage sludge is concentrated to a free-flowing granulate with at least 50 wt .-%, preferably 80 to 95 wt .-%, dry matter.
  • the speed is preferably set to a value in the range from 300 to 400 rpm.
  • a heated inert gas or superheated steam can also be fed to the paddle screw dryer.
  • drying can be improved in a known manner by maintaining a vacuum of 50 to 500 mbar in the paddle screw dryer.
  • the vacuum also has the advantage that the cell structures of the biomass break open more easily and the bound water can evaporate better.
  • a variant of the method according to the invention is that a sewage sludge dewatered to 15 to 20% by weight is first concentrated to 25 to 30% by weight in a coiled flow pipe with simultaneous feeding of hot inert gas or steam, and the concentrated sewage sludge is then downstream paddle screw dryer is brought to the desired final concentration.
  • the paddle screw dryer consists of a housing 1 in which two shafts 2 and 3 rotating in opposite directions are mounted.
  • the paddle screw dryer stands on a base 4 and is driven by a motor 6 via a gear 5.
  • On the shafts 2 and 3 are evenly distributed over the circumference and the length, perpendicular to the axis paddles 7 so closely arranged that only a narrow grinding gap s of a few millimeters (1 to 10 mm) remains between them.
  • the paddle surfaces are not oriented parallel to the plane perpendicular to the axis (normal plane), but are pivoted out of the normal plane with an angle of attack of 5 ° to 20 °, similar to fan blades. This ensures that the paddle screw is self-promoting.
  • the paddles 7 scrape off the inner surface of the housing 1 and each other, so that product caking is avoided.
  • the paddle screw dryer is provided with a heating jacket (not shown) which is charged with a temperature control medium.
  • the sewage sludge Before treatment in the paddle screw dryer, the sewage sludge is dewatered to 15 to 30% by weight solids with the help of mechanical methods, for example with a filter press.
  • the dewatered sewage sludge is fed to the paddle screw dryer through the inlet connection 8.
  • the entering sewage sludge is torn up by the paddles 7, whirled around in the paddle screw channel and conveyed further to the channel exit.
  • the heat required to evaporate the water is simultaneously supplied via the heating jacket.
  • the paddles 7 continuously scrape the sticky product off the walls and clean each other.
  • the sewage sludge pats are subjected to high shear stress and are ground in the process.
  • a second paddle screw with a different speed and different inclination can also be connected behind it, the first screw taking care of pre-drying (up to 50% by weight of dry material) and granulation, the second screw taking care of post-drying.
  • a fluid bed dryer with a large heat transfer area can also be used as a night dryer.
  • the paddle screw dryer is preferably operated at a speed in the range from 300 to 400 min ⁇ 1.
  • the high rotational speed also ensures that the sticky product is always carried along by the paddles 7 and is thrown over the entire channel circumference onto the heated walls, which improves the heat input and thus the drying.
  • the grinding effect also breaks up the sewage sludge cell structure, so that the capillary water can also be removed from the sewage sludge.
  • solid granules are obtained which are discharged through the nozzle 9.
  • the resulting vapors are discharged through the nozzle 10.
  • Convective drying can also be used.
  • a heated inert gas or superheated steam is fed to the inlet nozzle 8, which likewise leaves the dryer again through the vapor nozzle 10.
  • the process can also be carried out under reduced pressure (vacuum), which leads to an improvement in efficiency. It was also observed that the breakdown of the cells in the sewage sludge is facilitated, which also contributes to increasing the rate of evaporation. Under these conditions, hot inert gas or superheated steam (convective drying) can be dispensed with, which leads to a significant improvement in the energy balance.
  • a vacuum in the range of 50 to 500 mbar is generated with the help of a commercially available vacuum pump connected to the paddle screw dryer.
  • a sewage sludge mechanically dewatered to 15 to 20% by weight is placed in a coiled flow pipe upstream of the screw dryer 11 12 thermally concentrated to 25 to 30 wt .-%.
  • This pre-concentrated sewage sludge is then fed into the paddle screw dryer 11 and, as described above, dried to the finished sewage sludge granulate with a dry matter content of at least 50% by weight.
  • the heating jacket 13 of the paddle screw dryer 11 is provided with inlets and outlets 14, 15 for the heating liquid.
  • the coiled flow tube 12 also has a heating jacket with inlets and outlets 16, 17.
  • the mechanically dewatered sewage sludge is conveyed into the heated flow pipe 12 by means of a monopump 18.
  • a hot inert gas or superheated steam is fed into the flow pipe 12 via the feed 19, so that an annular flow is formed therein.
  • the effect of the inert gas or the superheated steam is to drive the pasty sewage sludge through the flow pipe 12, to improve the heat input via the wall and via convection and to increase the partial pressure drop which is important for the evaporation.
  • the heated, concentrated but still pasty sewage sludge then, together with the inert gas, reaches the paddle screw dryer 11, in which the final drying takes place.
  • the vapors formed and the inert gas or the superheated steam are fed through the vapor discharge line 10 to a condenser 20 in which the condensable parts are precipitated.
  • the condensate is separated from the gaseous phase in the downstream separator 21 and removed via the valves 22, 23.
  • the gaseous components are suctioned off via line 24.
  • the sewage sludge granulate with the desired dry matter content is, as described above, removed from the discharge nozzle 9 of the paddle screw dryer 11.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Sludge (AREA)
  • Drying Of Solid Materials (AREA)
EP93113970A 1992-09-14 1993-09-01 Procédé pour le séchage continu de boues d'épuration Withdrawn EP0588152A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924230679 DE4230679A1 (de) 1992-09-14 1992-09-14 Verfahren zur kontinuierlichen Klärschlammtrocknung
DE4230679 1992-09-14

Publications (1)

Publication Number Publication Date
EP0588152A1 true EP0588152A1 (fr) 1994-03-23

Family

ID=6467895

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93113970A Withdrawn EP0588152A1 (fr) 1992-09-14 1993-09-01 Procédé pour le séchage continu de boues d'épuration

Country Status (2)

Country Link
EP (1) EP0588152A1 (fr)
DE (1) DE4230679A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2080017A1 (es) * 1994-05-10 1996-01-16 Olmedilla Blas Bedmar Instalacion conjunta, continua y automatica para el secado y transformado de materias vegetales y animales.
NL1004243C2 (nl) * 1996-10-10 1998-04-14 Afvalzorg Noord Holland Nv Werkwijze en inrichting voor het verwerken van natte organische reststoffen tot veevoeder.
EP0872452A2 (fr) * 1997-04-16 1998-10-21 Gebr. Lödige Maschinenbau GmbH Procédé et appareil de purification de boues laminoirs contenant de l'huile et de l'eau
ES2148058A1 (es) * 1994-03-10 2000-10-01 Mc Enman S L Mejoras en el objeto de la patente principal p.9400489, por "aparato y procedimiento para deshumectar productos en forma de pasta por evaporacion intensiva.
EP1066888A1 (fr) * 1999-07-08 2001-01-10 Sam Sin Mechanical Engineering Co., Ltd. Appareil et procédé de recyclage de résidus de peinture
EP1070761A2 (fr) * 1999-07-21 2001-01-24 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour la valorisation des scories contenant des hydrocarbures et des calamines
EP1306352A2 (fr) * 2001-10-23 2003-05-02 Anro Anlagen- und Rohrleitungsbau GmbH Dispositif de séchage de boues comprenant un appareil de chauffage dans un système de transport
WO2009030186A1 (fr) * 2007-09-04 2009-03-12 Reiflock Verwaltungs Gmbh Dispositif de séchage pour boues d'épuration
CN101441031B (zh) * 2007-11-23 2010-06-09 沈阳禹华环保有限公司 一种大容量处理粘性物料的干燥机
WO2013011462A3 (fr) * 2011-07-20 2013-04-11 Aker Process Systems As Procédé de récupération d'un inhibiteur hydrate
DE102020000818A1 (de) 2020-02-09 2021-08-12 Emschergenossenschaft Verwertung von ausgefaultem Klärschlamm in einer Wirbelschichtanlage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19944110A1 (de) * 1999-09-15 2001-03-22 Kufferath Andreas Gmbh Verfahren und Mittel zum Entwässern einer Suspension
DE10362414B3 (de) 2003-11-18 2022-10-20 Cronimet Envirotec GmbH Weiterbearbeitungsanlage zum großtechnischen Trennen von industriellem Abfallschlamm
DE10353863B4 (de) 2003-11-18 2022-10-06 Cronimet Envirotec GmbH Verfahren zum großtechnischen Trennen von industriellem Abfallschlamm
CN105698385B (zh) * 2016-04-08 2018-11-13 南京理工大学 一种桨叶加热装置
CN109458827A (zh) * 2018-11-08 2019-03-12 郑州韦尔特生物科技有限公司 一种生物质燃料干燥装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636284A (en) * 1948-07-12 1953-04-28 Miami Boiler & Machine Company Handling of materials and apparatus therefor
DE2058291A1 (de) * 1969-11-28 1971-06-03 Kazunori Kubo Kontinuierliche Trockenanlage
EP0231584A1 (fr) * 1986-01-25 1987-08-12 Kubota Limited Dispositif de séchage du type à vis transporteuse
JPH01315399A (ja) * 1988-06-13 1989-12-20 Takuma Co Ltd 汚泥乾燥装置
JPH01315397A (ja) * 1988-06-15 1989-12-20 Mitsui Eng & Shipbuild Co Ltd 乾燥機の運転方法
EP0396852A1 (fr) * 1989-05-09 1990-11-14 Deutsche Babcock Anlagen Gmbh Procédé et installations pour le séchage de boue d'épuration
EP0474890A1 (fr) * 1990-09-01 1992-03-18 Max Dipl.-Ing. Aicher Procédé et dispositif pour le traitement de boues d'épuration

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1658075A1 (de) * 1967-03-07 1970-05-06 Kohlmann Dr Ing Hans Verfahren zum Eindicken von Schlamm
JPS4846955A (fr) * 1971-10-15 1973-07-04
SU697399A1 (ru) * 1977-10-24 1979-11-15 Научно-Исследовательский И Проектный Институт Обогащения И Механической Обработки Полезных Ископаемых Уралмеханобр Способ обезвоживани железобедержащего шлама и устройство дл его осуществлени
SU922089A1 (ru) * 1980-07-14 1982-04-23 Кировский Политехнический Институт Устройство дл дезодорации и сушки отходов
DE3435094A1 (de) * 1984-09-25 1986-04-03 Uhde Gmbh, 4600 Dortmund Verfahren und anlage zur indirekten schlammtrocknung insbesondere von abwaesserschlaemmen
SU1386592A1 (ru) * 1986-08-07 1988-04-07 Всесоюзный Научно-Исследовательский Институт Водоснабжения,Канализации,Гидротехнических Сооружений И Инженерной Гидрогеологии "Водгео" Устройство дл механического обезвоживани осадков сточных вод
DE3911716A1 (de) * 1989-04-10 1990-10-11 Wilfried Schraufstetter Verfahren zum trocknen von schlamm und schlammtrocknungsanlage zur durchfuehrung des verfahrens
SU1708778A1 (ru) * 1989-07-26 1992-01-30 Ленинградский Государственный Проектный Институт Способ обработки осадка

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636284A (en) * 1948-07-12 1953-04-28 Miami Boiler & Machine Company Handling of materials and apparatus therefor
DE2058291A1 (de) * 1969-11-28 1971-06-03 Kazunori Kubo Kontinuierliche Trockenanlage
EP0231584A1 (fr) * 1986-01-25 1987-08-12 Kubota Limited Dispositif de séchage du type à vis transporteuse
JPH01315399A (ja) * 1988-06-13 1989-12-20 Takuma Co Ltd 汚泥乾燥装置
JPH01315397A (ja) * 1988-06-15 1989-12-20 Mitsui Eng & Shipbuild Co Ltd 乾燥機の運転方法
EP0396852A1 (fr) * 1989-05-09 1990-11-14 Deutsche Babcock Anlagen Gmbh Procédé et installations pour le séchage de boue d'épuration
EP0474890A1 (fr) * 1990-09-01 1992-03-18 Max Dipl.-Ing. Aicher Procédé et dispositif pour le traitement de boues d'épuration

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 115 (C - 0696) 5 March 1990 (1990-03-05) *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 115 (C - 696)<4058> 5 March 1990 (1990-03-05) *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2148058A1 (es) * 1994-03-10 2000-10-01 Mc Enman S L Mejoras en el objeto de la patente principal p.9400489, por "aparato y procedimiento para deshumectar productos en forma de pasta por evaporacion intensiva.
ES2080017A1 (es) * 1994-05-10 1996-01-16 Olmedilla Blas Bedmar Instalacion conjunta, continua y automatica para el secado y transformado de materias vegetales y animales.
NL1004243C2 (nl) * 1996-10-10 1998-04-14 Afvalzorg Noord Holland Nv Werkwijze en inrichting voor het verwerken van natte organische reststoffen tot veevoeder.
EP0836806A1 (fr) * 1996-10-10 1998-04-22 NV Afvalzorg Noord-Holland Procédé et dispositif de transformation de déchets organiques humides en aliment pour animaux
EP0872452A3 (fr) * 1997-04-16 2001-07-18 Gebr. Lödige Maschinenbau GmbH Procédé et appareil de purification de boues laminoirs contenant de l'huile et de l'eau
EP0872452A2 (fr) * 1997-04-16 1998-10-21 Gebr. Lödige Maschinenbau GmbH Procédé et appareil de purification de boues laminoirs contenant de l'huile et de l'eau
EP1066888A1 (fr) * 1999-07-08 2001-01-10 Sam Sin Mechanical Engineering Co., Ltd. Appareil et procédé de recyclage de résidus de peinture
EP1070761A3 (fr) * 1999-07-21 2002-04-17 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour la valorisation des scories contenant des hydrocarbures et des calamines
EP1070761A2 (fr) * 1999-07-21 2001-01-24 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour la valorisation des scories contenant des hydrocarbures et des calamines
EP1306352A2 (fr) * 2001-10-23 2003-05-02 Anro Anlagen- und Rohrleitungsbau GmbH Dispositif de séchage de boues comprenant un appareil de chauffage dans un système de transport
EP1306352A3 (fr) * 2001-10-23 2003-11-26 Anro Anlagen- und Rohrleitungsbau GmbH Dispositif de séchage de boues comprenant un appareil de chauffage dans un système de transport
WO2009030186A1 (fr) * 2007-09-04 2009-03-12 Reiflock Verwaltungs Gmbh Dispositif de séchage pour boues d'épuration
CN101441031B (zh) * 2007-11-23 2010-06-09 沈阳禹华环保有限公司 一种大容量处理粘性物料的干燥机
WO2013011462A3 (fr) * 2011-07-20 2013-04-11 Aker Process Systems As Procédé de récupération d'un inhibiteur hydrate
US9006500B2 (en) 2011-07-20 2015-04-14 Aker Process Systems As Hydrate inhibitor recovery process
AP3895A (en) * 2011-07-20 2016-11-13 Aker Process Systems As Hydrate inhibitor recovery process
AU2012285402B2 (en) * 2011-07-20 2017-04-20 Grant Prideco, Inc. Hydrate inhibitor recovery process
DE102020000818A1 (de) 2020-02-09 2021-08-12 Emschergenossenschaft Verwertung von ausgefaultem Klärschlamm in einer Wirbelschichtanlage

Also Published As

Publication number Publication date
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