EP0789209A2 - Procédé pour le séchage de boues, en particulier de boues d'égout - Google Patents

Procédé pour le séchage de boues, en particulier de boues d'égout Download PDF

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Publication number
EP0789209A2
EP0789209A2 EP96111367A EP96111367A EP0789209A2 EP 0789209 A2 EP0789209 A2 EP 0789209A2 EP 96111367 A EP96111367 A EP 96111367A EP 96111367 A EP96111367 A EP 96111367A EP 0789209 A2 EP0789209 A2 EP 0789209A2
Authority
EP
European Patent Office
Prior art keywords
dryer
sludge
air
carrier material
amount
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.)
Granted
Application number
EP96111367A
Other languages
German (de)
English (en)
Other versions
EP0789209A3 (fr
EP0789209B1 (fr
Inventor
Klaus Dr.-Ing. Steier
Stephan Dipl.-Ing. Wild
Erwin Dipl.-Ing. Brunnmair
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
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Publication date
Application filed by Andritz Patentverwaltungs GmbH filed Critical Andritz Patentverwaltungs GmbH
Publication of EP0789209A2 publication Critical patent/EP0789209A2/fr
Publication of EP0789209A3 publication Critical patent/EP0789209A3/fr
Application granted granted Critical
Publication of EP0789209B1 publication Critical patent/EP0789209B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure
    • 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
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
    • 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 sludge, in particular sewage sludge, in which a mixture of a carrier material and moist material is fed to a dryer and hot gas or air are passed over it.
  • Such methods are e.g. known from WO 93/24800 or US 5,069,801.
  • the burner temperature or dryer inlet temperature is usually regulated accordingly in response to fluctuating dry contents of the wet sludge.
  • the dryer inlet temperature must be increased, the limits of the burner being reached quickly and sufficient drying can only be achieved by reducing the throughput, which usually has to be done by hand.
  • the aim of the invention is therefore to provide a method in which the operating conditions of the dryer are kept constant.
  • the supply quantity of the moist material (wet sludge) is regulated as a function of the outlet temperature of the hot gas or the hot air from the dryer.
  • This procedure allows the dryer to be operated with optimal parameters.
  • the fluctuations in the dry content of the amount of wet sludge supplied are essentially compensated for by a change in the amount.
  • the overall evaporation capacity of the dryer remains constant.
  • a further development of the invention is characterized in that the amount of carrier material is regulated as a function of the dryer inlet temperature. This allows the system to be adapted in a favorable manner to a desired heating output of the dryer.
  • An advantageous embodiment of the invention is characterized in that the regulation of the amount of wet sludge is carried out by regulation of the speed of the dosing device, in particular of the feed screw. This allows a well functioning adjustment of the supply quantity to be carried out in a simple and inexpensive manner.
  • a favorable further development of the invention is characterized in that the regulation of the amount of carrier material takes place by regulation of the speed of the metering device, in particular the carrier material feed screw.
  • the amount of carrier material can be adapted to the dryer conditions in a simple and cost-effective manner.
  • Another favorable embodiment of the invention is characterized in that the burner exhaust air, optionally mixed with recirculated air, is used as hot air.
  • a favorable development of the invention is characterized in that the circulating air heated in a heat exchanger is used as hot air, the circulating air being able to be heated by burner exhaust air or thermal oil.
  • An advantageous embodiment of the invention is characterized in that a drum dryer, fluid bed dryer or disk dryer is used as the dryer.
  • FIG. 1 shows a variant of a sludge drying system
  • FIG. 2 shows a further variant of a sludge drying system.
  • Pre-dewatered sludge 1 is fed to a container 2, from which it is fed to a mixer 5 via a feed screw 3, which is driven by an adjustable motor 4, and from there it is sucked into the dryer 6 via a further mixing and conveying screw 5 '.
  • a fluidized bed or disc dryer can also be used as the dryer 6.
  • the dried material is fed through the supply of drying air via a line 7 to a cutter or cyclone 8 and passed on to a screw conveyor 11 via a cellular wheel sluice 10.
  • the fine solid particles, which still remain in the air after the cyclone 8, are separated in a subsequent filter 9 and also fed to the screw conveyor 11.
  • the granular solid is further fed via a lock 12 to a screening plant 13, in which excessively large granules are fed to a crusher 14, and the granules with the desired grain size are conveyed via a line 15 to packaging and transport devices.
  • a partial flow of the desired grain size can be fed to the crusher.
  • the material comminuted in the crusher 14 is mixed with the very fine particles from the sieve 13 and fed to a carrier material silo 18 via a screw conveyor 16 and a subsequent conveyor lift 17. From this, the carrier material is fed to the mixer 5 via a carrier material feed screw 19, which is driven by a speed-controlled motor 20.
  • the energy for drying is generated according to FIG.
  • a burner 21 which emits its heat in a heat exchanger 22 to the ambient air.
  • the burner exhaust gas is of a fan 23 is partly fed back to the burner via a line 24 or fed into the exhaust gas chimney 26 via a line 25 and released from there to the environment.
  • the circulating air heated in the heat exchanger 22 is fed to the dryer 6 via the line 27.
  • the drying air is conveyed by a fan 28 arranged after the filter 9. This also ensures that there is a negative pressure in the area of the air system in which material is conveyed, and therefore no dust can be released into the environment.
  • the hot, moisture-laden air is fed after the fan 28 to a washer / condenser 29, in which cooling water is injected.
  • the now cooled and dried air is then returned to the heat exchanger 22 via a line 30 and thus reused.
  • a partial flow of air is fed from the scrubber 29 to the burner for combustion via a line 31.
  • the dryer inlet temperature in line 27 is measured by a temperature sensor 32 and the burner outlet temperature in line 7 by a temperature sensor 33.
  • the signal from the temperature sensor 32 is used to supply the fuel to regulate a valve 34. Gas or oil can be used as fuel. If there is now a change in the dry matter content of the sludge 1 supplied, this has an effect after the dryer in the dryer outlet temperature 33.
  • the burner temperature or air inlet temperature of the dryer was regulated as a function of this outlet temperature 33.
  • the air inlet temperature (32) must be lowered when the sludge 1 has a higher dry content, which leads to a reduction in the dryer output.
  • the dryer inlet temperature must be increased, a limit being reached relatively quickly here and the throughput of the amount of sludge to be dried reduced.
  • the dryer inlet temperature can now be kept constant. If sludge with a higher dry content is now added, the lower temperature required to evaporate increases the outlet temperature from the dryer. Via the temperature sensor 33, a signal is then given to the speed-controlled motor 4 of the feed screw 3, which increases the throughput. This ensures that the same amount of water must always be evaporated in the dryer.
  • an appropriate inlet temperature for the dryer can be specified. This can be the case, for example, if the amount of wet sludge to be dried is small and, on the one hand, energy savings can be achieved by reducing the drying temperature in the burner and, on the other hand, emissions can be reduced in the exhaust gases.
  • the temperature sensor 32 sends a signal to the motor 20 of the carrier material feed screw 19, the amount of carrier material being reduced at a lower dryer inlet temperature. This reduces the Dryness of the mixture of wet sludge and carrier material fed to the dryer and, subsequently, a lower dryer outlet temperature also occurs.
  • the amount of sludge 1 supplied is also reduced, as a result of which the mixture fed to the dryer in turn has a constant dry content. Overall, the total throughput through the dryer is reduced in this way.
  • thermal oil can also be used instead of the burner to heat the circulating air or another circuit of the circuit or other system components can be implemented.
  • FIG. 2 shows a sludge drying system in which the exhaust air from the burner 21 is fed directly to the dryer 6 via the line 27.
  • the circulating air 30 coming from the scrubber / condenser 29 is fed to the burner 21 as combustion air. Excess moist air escapes from the scrubber / condenser 29 into the environment via a line 31 ', it being possible here for filter systems to be interposed.
  • the outlet temperature from the dryer is kept constant by regulating the inlet temperature.
  • a drier with a constant evaporation capacity is charged with a wet sludge with a dry content of 25%.
  • the specified air inlet temperature in the dryer is 450 ° C, the outlet temperature is 90 ° C
  • wet sludge is added with a higher dry content, the amount of dry sludge naturally increases accordingly.
  • the table shows that, for example, with a wet sludge dry content of 27%, the outlet temperature from the dryer would rise to 98 ° C.
  • the desired outlet temperature is again 90 ° C.
  • the sludge drying system is fed a wet sludge with a lower dry content, you can e.g. recognize at a dry content of 23% that the air outlet temperature from the dryer would be 79 ° C.
  • an outlet temperature of 90 ° C is reached.
  • the necessary inlet temperature increases to e.g. 478 ° C with a dry matter content of 20% whereby the higher temperatures can no longer be achieved with even lower dry matter contents. In this case, the amount of sludge added must be reduced.
  • Example 2 Analogous to example 3, the amount of wet sludge is reduced here when the wet sludge supplied has a lower dry content. Here too the amounts of wet sludge can be compared with Example 2.
  • the inlet temperature of the air in front of the dryer is reduced.
  • a temperature of 400 ° C is set, for example.
  • the amount of the backmix sludge is now reduced by controlling the feed screw.
  • the control also reduces the amount of wet sludge accordingly, so that the desired constant dryer outlet temperature of here 90 ° C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Sludge (AREA)
EP96111367A 1995-09-27 1996-07-15 Procédé pour le séchage de boues, en particulier de boues d'égout Expired - Lifetime EP0789209B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT159895 1995-09-27
AT0159895A AT402636B (de) 1995-09-27 1995-09-27 Verfahren zur trocknung von schlamm, verfahren zur trocknung von schlamm, insbesondere klärschlamm insbesondere klärschlamm
AT1598/95 1995-09-27

Publications (3)

Publication Number Publication Date
EP0789209A2 true EP0789209A2 (fr) 1997-08-13
EP0789209A3 EP0789209A3 (fr) 1998-04-01
EP0789209B1 EP0789209B1 (fr) 2002-03-06

Family

ID=3516881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96111367A Expired - Lifetime EP0789209B1 (fr) 1995-09-27 1996-07-15 Procédé pour le séchage de boues, en particulier de boues d'égout

Country Status (4)

Country Link
US (1) US5775004A (fr)
EP (1) EP0789209B1 (fr)
AT (1) AT402636B (fr)
DE (1) DE59608836D1 (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
WO2018132822A1 (fr) * 2017-01-16 2018-07-19 Envirostar, Llc Systèmes et procédés de commande de séchoir

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404015B (de) * 1996-04-17 1998-07-27 Andritz Patentverwaltung Verfahren zum trocknen von gut, insbesondere klärschlamm
US6182375B1 (en) * 1996-09-25 2001-02-06 Institute Of Paper Science And Technology, Inc. Method and apparatus for multi-NIP impulse drying
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
AT413602B (de) * 2003-08-26 2006-04-15 Andritz Ag Maschf Vorrichtung und verfahren zum trocknen einer substanz, insbesondere klärschlamm
US8956539B2 (en) * 2013-03-09 2015-02-17 I. Kruger Inc. System and method for drying biosolids and enhancing the value of dried biosolids
CN104860507B (zh) * 2015-06-10 2016-11-16 湖南首创投资有限责任公司 一种污泥脱水烘干成型系统
KR20170109912A (ko) * 2016-03-22 2017-10-10 삼성에스디아이 주식회사 극판 건조 장치
FI128437B (en) * 2016-08-18 2020-05-15 Tm System Finland Oy Method and arrangement for air recirculation in the drying process
US10845120B1 (en) * 2018-03-01 2020-11-24 Steve Macchio Systems and methods for environmentally-clean thermal drying

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5069801A (en) * 1990-02-26 1991-12-03 Bio Gro Systems, Incorporated Indirect heat drying and simultaneous pelletization of sludge
US5279637A (en) * 1990-10-23 1994-01-18 Pcl Environmental Inc. Sludge treatment system
US5318184A (en) * 1992-09-10 1994-06-07 Georg Krebs Sludge drying system
DE4242747A1 (de) * 1992-12-17 1994-06-23 Steag Ag Verfahren und Anlage zum Behandeln von Schlamm
DE19531101C1 (de) * 1995-08-24 1997-01-02 Walther & Cie Ag Verfahren zur Regelung einer Schlammtrocknungsanlage mit Rückführung

Family Cites Families (8)

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US3958920A (en) * 1975-06-03 1976-05-25 Rust Engineering Company System for controlling the operation of a multiple hearth furnace
US4696115A (en) * 1986-07-22 1987-09-29 Nabisco Brands, Inc. Method and apparatus for drying wet particulate material to a predetermined uniform moisture content
US4713893A (en) * 1986-10-31 1987-12-22 Consolidation Coal Co. Thermal dryer control system
GB8803380D0 (en) * 1988-02-13 1988-03-16 Gbe International Plc Rotary drier control by adjustment of air flow/air humidity
US5067254A (en) * 1990-05-25 1991-11-26 Cedarapids, Inc. Method and apparatus for modifying a veil of materials in a drum of a drying apparatus
US5309849A (en) * 1992-05-22 1994-05-10 Andritz Tcw Engineering Gmbh Sludge drying system with recycling exhaust air
GB9220428D0 (en) * 1992-09-28 1992-11-11 Barr Derek J Sludge treating process and apparatus
US5588222A (en) * 1995-03-15 1996-12-31 Beloit Technologies, Inc. Process for recycling combustion gases in a drying system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5069801A (en) * 1990-02-26 1991-12-03 Bio Gro Systems, Incorporated Indirect heat drying and simultaneous pelletization of sludge
US5279637A (en) * 1990-10-23 1994-01-18 Pcl Environmental Inc. Sludge treatment system
US5318184A (en) * 1992-09-10 1994-06-07 Georg Krebs Sludge drying system
DE4242747A1 (de) * 1992-12-17 1994-06-23 Steag Ag Verfahren und Anlage zum Behandeln von Schlamm
DE19531101C1 (de) * 1995-08-24 1997-01-02 Walther & Cie Ag Verfahren zur Regelung einer Schlammtrocknungsanlage mit Rückführung

Cited By (6)

* 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
WO2018132822A1 (fr) * 2017-01-16 2018-07-19 Envirostar, Llc Systèmes et procédés de commande de séchoir
US10591213B2 (en) 2017-01-16 2020-03-17 Envirostar, Llc Dryer control systems and methods

Also Published As

Publication number Publication date
DE59608836D1 (de) 2002-04-11
EP0789209A3 (fr) 1998-04-01
ATA159895A (de) 1996-11-15
US5775004A (en) 1998-07-07
EP0789209B1 (fr) 2002-03-06
AT402636B (de) 1997-07-25

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