EP0802381A2 - Procédé de séchage de matériaux, notamment de boues d'égout - Google Patents

Procédé de séchage de matériaux, notamment de boues d'égout Download PDF

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Publication number
EP0802381A2
EP0802381A2 EP97103315A EP97103315A EP0802381A2 EP 0802381 A2 EP0802381 A2 EP 0802381A2 EP 97103315 A EP97103315 A EP 97103315A EP 97103315 A EP97103315 A EP 97103315A EP 0802381 A2 EP0802381 A2 EP 0802381A2
Authority
EP
European Patent Office
Prior art keywords
amount
fine
dried
drying
fine material
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.)
Ceased
Application number
EP97103315A
Other languages
German (de)
English (en)
Other versions
EP0802381A3 (fr
Inventor
Erwin Dipl.Ing. Brunnmair
Reinhard Dipl.Ing. Dr.Techn. Pinter
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.)
Andritz AG
Original Assignee
Andritz Patentverwaltungs GmbH
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 Andritz Patentverwaltungs GmbH filed Critical Andritz Patentverwaltungs GmbH
Publication of EP0802381A2 publication Critical patent/EP0802381A2/fr
Publication of EP0802381A3 publication Critical patent/EP0802381A3/fr
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers

Definitions

  • the invention relates to a method for drying material, in particular sewage sludge, to produce granules from the material to be dried, fine material which has already been dried being mixed with the material to be dried.
  • granules of different grain sizes are formed from the material to be dried, depending on the respective operating state of the system and the nature of the material to be dried, i.e. H. for example the nature of the sludge.
  • H. the nature of the material to be dried
  • These sizes are usually divided into different fractions in a sieve, a crusher being arranged to comminute the coarse fraction and partly the middle fraction in order to provide the amount of fine material required for backmixing.
  • the crusher has the disadvantage of high investment costs and high energy consumption.
  • it is also subject to heavy wear, so that additional maintenance and thus high maintenance costs arise.
  • the aim of the present invention is a process for drying material which requires less equipment and can be carried out in a more economical, simple system which can be operated with low energy and maintenance costs.
  • the amount of fine material obtained after drying and the amount of fine material mixed with the material to be dried are determined is set inversely proportional to the amount of fine material.
  • the amount of fine material obtained is determined periodically and the amount of the admixed material is also periodically readjusted. This enables a quick reaction to fluctuations in the amount of fine material.
  • the amount of fine material obtained is continuously determined and the amount of the admixed material is also continuously adjusted. This ensures the fastest possible reaction to fluctuations in the process.
  • the dryer outlet temperature and / or the amount of the drying material subjected to the drying step are used as control variables Readjustment of the amount of material mixed into the material to be dried is used.
  • a further regulation takes place by adapting the dry content after the drying step only when certain limit values of the amount of fine material are exceeded. This makes it possible to react to certain process changes that could not be corrected simply by adjusting the backmix quantity of fine material. As long as the quantities of fine material remain within the predetermined limits, the final dry matter content is also kept constant.
  • the dry content is preferably readjusted in inverse proportion to the amount of fine material obtained.
  • FIG. 1 schematically shows a conventional plant for drying sludge.
  • FIG. 2 is a diagram to explain the relationship between the grain size of the dried material and the dry content after the drying step
  • FIG. 3 is a diagram of a plant for carrying out the method according to the invention.
  • the material to be dried arrives in the conventional system of FIG. 1 from the wet goods silo 1 which buffers the feed into a mixer 2 in which, to set the desired moisture content and to avoid sticking, already dried sludge of the fine grain fraction is added from a storage silo 3.
  • This mixture is conveyed into the dryer drum 5 via a screw conveyor 4, in which it is dried by hot air in the example shown.
  • This air is heated in a heat exchanger 6, the primary side of which is supplied with the flue gases of, for example, an oil or gas-fired burner with burner boiler 7, which are then passed outside via the feed fan 8 and a chimney 9.
  • the dried sludge is led out of the dryer drum 5 via a filter system 10, from which the dryer air is drawn off into a condenser 12 by the delivery fan 11.
  • the dryer air is returned via a line 13 to the secondary side of the heat exchanger 6, heated and passed into the dryer drum 5.
  • the excess air from the condenser 12, in good systems approx. 100-300 m 3 / h per ton of water evaporation, is likewise returned to the burner via a further line 14.
  • the solid, dried constituents are separated from the air from the dryer drum 5 in the filter system 10 and passed through a sieve 15, from where the coarse fractions and part of the medium-sized granules are crushed in the crusher 16 and brought together with the fine fraction into the storage silo 3 will.
  • Some of the medium-sized granulate parts are packed, loaded or otherwise deposited or processed, if necessary after buffering in a storage silo.
  • the control unit 17 is connected to a device which determines the amount of fine-grain fraction obtained after the drying, ie after the dryer 5.
  • this device is a fill level sensor 18 in the storage silo 3, which sensor 18 supplies the control signal for the backmixing of the fine grain fraction in the mixer 2.
  • the level in the storage silo 3 drops further for the time being, but the dry content increases after the mixer 2 and before the drying process.
  • the proportion of fine grains after the dryer 5 and in the sieve 15 also increases.
  • the silo 3 is thereby refilled, which is determined by the sensor 18 and reported to the control unit 17. The latter then reduces the fine-grain backmixing again by means of corresponding signals via the control line (s) 19, 20.
  • the regulation described above takes place as long as the quantities of fine-grain granulate after the dryer 5 remain within predetermined limits, which are represented by level limit values in the storage silo 3 in the example shown.
  • a further control circuit is put into effect by the control unit 17 if these limit values are exceeded or undershot.
  • This regulates the amount of fine grain by setting the Final dry content of the granules after drying, which parameter is represented by the signal of the outlet temperature of the dryer 5 detected by the sensor 21. As long as the level in the silo 3 lies between the maximum and the minimum mark, this temperature is kept at a constant value, for example 90 ° C.
  • control unit 17 increases the output of the burner 7, for example, so that the temperature of the drying process and, as a result, also the final dryness.
  • the mean grain size at the dryer outlet drops and more fine material is thus obtained again.
  • the pellet crusher behind the sieve can also be omitted, only the Crushers for fine grinding must be preserved before combustion. This also makes it possible to carry out the method in a less complex system that can be operated with less maintenance.
  • control unit 17 can be a microprocessor with a program representing the control relationships, which can be adapted to special operating conditions, or a hard-wired circuit.
  • the program naturally also includes query loops for all control-relevant sensors.
  • control unit 17 there could also be any display devices and the necessary settings would then be made manually, for example by manually setting the burner temperature, by manually setting the speeds of the motors for the screw conveyors or functionally similar feed devices, and the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Sludge (AREA)
EP97103315A 1996-04-17 1997-02-28 Procédé de séchage de matériaux, notamment de boues d'égout Ceased EP0802381A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT694/96 1996-04-17
AT0069496A AT404015B (de) 1996-04-17 1996-04-17 Verfahren zum trocknen von gut, insbesondere klärschlamm

Publications (2)

Publication Number Publication Date
EP0802381A2 true EP0802381A2 (fr) 1997-10-22
EP0802381A3 EP0802381A3 (fr) 1998-04-01

Family

ID=3497366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97103315A Ceased EP0802381A3 (fr) 1996-04-17 1997-02-28 Procédé de séchage de matériaux, notamment de boues d'égout

Country Status (3)

Country Link
US (1) US5960559A (fr)
EP (1) EP0802381A3 (fr)
AT (1) AT404015B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0844452A1 (fr) * 1996-11-22 1998-05-27 Andritz-Patentverwaltungs-Gesellschaft m.b.H. Procédé pour le séchage de boues, en particulier de boues d'égout
WO1999042775A1 (fr) 1998-02-17 1999-08-26 Combustion Y Secado Ingenieria, S.A. Sechoir tubulaire par tuyeres et fluidification
WO2001094866A1 (fr) * 2000-06-09 2001-12-13 Andritz Ag Procede et dispositif de sechage de boues
CN102954670A (zh) * 2011-08-25 2013-03-06 山东旭业新材料股份有限公司 湿物料分离器及分离干燥方法

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19602290A1 (de) * 1996-01-23 1997-07-24 Loedige Maschbau Gmbh Geb Verfahren zur Trocknung von Klärschlamm oder Schlämmen ähnlicher Konsistenz
AT406672B (de) * 1998-02-26 2000-07-25 Andritz Patentverwaltung Verfahren und anlage zur mechanischen und thermischen entwässerung von schlämmen
AU3338101A (en) * 2000-04-09 2001-10-11 Maschinenfabrik J. Dieffenbacher Gmbh & Co. Method and plant to reduce the water contents bound in the capillaries of fibrous cells
GB2403718B (en) * 2003-07-01 2006-06-28 Internat Technology Traders Lt Organic waste disposal
US7195425B2 (en) * 2004-12-02 2007-03-27 Randal B Myers Method to produce landfill daily cover from sewer sludge and MSW
US20090047613A1 (en) * 2005-03-29 2009-02-19 Kadant Black Clawson Inc. Method and Apparatus for Pneumatic Drying of Lime Mud
US7669348B2 (en) * 2006-10-10 2010-03-02 Rdp Company Apparatus, method and system for treating sewage sludge
US20090293303A1 (en) * 2008-06-03 2009-12-03 Synagro Technologies, Inc. Biosolid Drying and Utilization in Cement Processes
US9255187B2 (en) * 2013-03-15 2016-02-09 Synergy Horizon Limited Method for production of dry hydrolytic lignin
RU2580145C2 (ru) * 2013-11-21 2016-04-10 Юрий Александрович Чивель Способ получения объемных изделий с градиентом свойств из порошков и устройство для его осуществления

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AT402636B (de) * 1995-09-27 1997-07-25 Andritz Patentverwaltung Verfahren zur trocknung von schlamm, verfahren zur trocknung von schlamm, insbesondere klärschlamm insbesondere klärschlamm
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0844452A1 (fr) * 1996-11-22 1998-05-27 Andritz-Patentverwaltungs-Gesellschaft m.b.H. Procédé pour le séchage de boues, en particulier de boues d'égout
US6006440A (en) * 1996-11-22 1999-12-28 Andritz-Payrntverwaltungs-Gesellschaft M.B.H. Process and apparatus for drying a slurry
WO1999042775A1 (fr) 1998-02-17 1999-08-26 Combustion Y Secado Ingenieria, S.A. Sechoir tubulaire par tuyeres et fluidification
WO2001094866A1 (fr) * 2000-06-09 2001-12-13 Andritz Ag Procede et dispositif de sechage de boues
CN102954670A (zh) * 2011-08-25 2013-03-06 山东旭业新材料股份有限公司 湿物料分离器及分离干燥方法

Also Published As

Publication number Publication date
ATA69496A (de) 1997-12-15
EP0802381A3 (fr) 1998-04-01
AT404015B (de) 1998-07-27
US5960559A (en) 1999-10-05

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