EP1564515A2 - Verfahren zur Trocknung von nassen Abfallstoffen. - Google Patents

Verfahren zur Trocknung von nassen Abfallstoffen. Download PDF

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Publication number
EP1564515A2
EP1564515A2 EP05397006A EP05397006A EP1564515A2 EP 1564515 A2 EP1564515 A2 EP 1564515A2 EP 05397006 A EP05397006 A EP 05397006A EP 05397006 A EP05397006 A EP 05397006A EP 1564515 A2 EP1564515 A2 EP 1564515A2
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EP
European Patent Office
Prior art keywords
drying
base
mass
spread
dried
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Withdrawn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
EP05397006A
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English (en)
French (fr)
Other versions
EP1564515A3 (de
Inventor
Ilkka Ilmavirta
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Vapo Oy
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Vapo Oy
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Filing date
Publication date
Application filed by Vapo Oy filed Critical Vapo Oy
Publication of EP1564515A2 publication Critical patent/EP1564515A2/de
Publication of EP1564515A3 publication Critical patent/EP1564515A3/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/10—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in the open air; in pans or tables in rooms; Drying stacks of loose material on floors which may be covered, e.g. by a roof
    • 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 present invention relates to a method in drying wet waste materials, such as sludges and bark mass, in which the materials to be dried are spread on an essentially waterproof base and solar energy is exploited in the drying, in which the initial moisture content of the materials is 60 - 90 % and the target moisture content 30 - 55 %, and in which the drying takes place as batch drying, by spreading one batch of the material to be dried at a time on the base, and removing it after drying for further use.
  • the target moisture content is usually 45 - 50 % and for industrial sludges 35 - 40 %.
  • Japanese application publication JP5261707 additionally discloses the exploitation of waste heat accumulated under the glass roof of a plant, in addition to solar energy, in the drying of bark and timber waste, which is conveyed under this glass roof.
  • the solution requires quite complex conveyor solutions.
  • the invention is intended to create a new type of method for drying wet waste materials, with the aid of which an industrial plant can solve its waste problem more economically than before.
  • the characteristic features of the invention are stated in the accompanying Claims.
  • a quite surprising observation is that in variable weather conditions, such as those in Finland, the best result is achieved using very short-cycle drying, particularly when it takes account of the expected evaporation, based on weather forecasts. This is due to the fact that using this method the material can be dried even on days on which it rains heavily for part of the day. For example, the forecast may predict great evaporation during the morning, but heavy rain in the afternoon.
  • the length of the drying period is then set to that of the period of great evaporation and the spreading thickness is defined to be thin enough for the target moisture content to be achieved during this period.
  • the material is then removed before the rain.
  • Such days are numerous. In this method, a rainy day is not allowed to break the drying period, which must be attempted to be defined beforehand, according to the weather forecast.
  • the spreading thickness can vary within wide limits. Normally, the spreading thickness in the daily cycle is 2 - 4 cm (the average evaporation on a sunny summer day is 4,5 mm /day), though the spreading thickness can be exceptionally as much as 10 cm, when the evaporation is very great.
  • the combined effect of the heated base and an exceptional drying day can raise evaporation to even 20 mm/day, in which case the layer thickness can be even greater than the above.
  • the layer thickness can be greater, if the drying period is extended to two or three days in good conditions (continued high pressure - reasonable evaporation).
  • the mass spread on the base should be coarse. Often the waste material (sludge) is sufficiently coarse naturally, but if necessary a sufficient amount of bark mass or, for example, peat is mixed with it.
  • soaking wet waste material is pre-dried mechanically by pressing it to remove free water.
  • Bark mass is sometimes extremely wet, due to either log-floating transportation or stockpile wetting.
  • substantially lighter and faster pre-drying being instead sufficient in connection with field drying.
  • a bark mass with, for example, a water content of 75 % by weight is pressed to, for example, 66 %, which reduces the duration of the actual field drying to half, or else the layer thickness can be doubled.
  • the asphalted base is marked with the reference number 12 and the heating piping located under the base with the reference number 10.
  • ditches or drains are arranged for rainwater while the surface of the area is cambered to lead the water into them (not shown).
  • low-temperature (40 - 70 °C) waste process heat from the industrial plant 8 heats the circulating water of the ground piping 10 to the range 20 - 50 °C.
  • the method can also be used when heating from beneath is not available, though heating will substantially improve the method.
  • the layer thickness of the material is set in the range 1 - 10 cm, preferably 2 - 5 cm on a non-heated base and 4 - 10 cm on a heated base.
  • the drying period and layer thickness are defined from the evaporation assumed from the current weather forecast.
  • the drying target typically 45 - 50 % by weight for bark
  • the length of the drying period is usually 1 day or shorter, for example, 3 - 10 hours in good conditions, in which case 2 - 4 harvests per day will be obtained.
  • the thickness of the layer being spread is determined according to the evaporation conditions. Using bark mass or other auxiliary masses, the coarseness of the material being dried is set to be large enough that its particle size is 10 - 30 % over a 50 % share. Drying will then take place through the entire layer.
  • the base is partly roofed, but is completely open to the wind.
  • the canopy 18 is therefore set on pillars 20, 22.
  • the canopy 18 is sufficiently high for a machine to fit easily to work under it.
  • the sloping roof is transparent over at least a large area, to allow solar radiation to heat through it.
  • the effective drying area is preferably even considerably larger than the roofed area, as the roofed space is only required as protection during periods of rain.
  • Heating from beneath substantially improves the drying efficiency. Effective drying will now take place at all seasons, even when the sun is not shining directly. Even in winter, there are often good conditions for drying, because the air is very dry. Only periods of torrential rain, when rainwater driven by a high wind can wet the mass, cannot be included in the drying periods. The wetting damage of even these periods can be reduced, if the mass is gathered under protection on the basis of weather forecasts.
  • the heating from beneath rapidly dries and heats the asphalt after rain. The heating of the field prevents the bark mass from freezing into a solid lump during winter storage.
  • the harvesting equipment used is the simplest possible, such as a wheeled loader 13 equipped with a crushing sieve bucket 14 (mesh size 40 mm, generally 25 - 60 mm), a manure-spreader device, collector trailers, a bucket, and, for example, a ridge windrower, with the aid of which the dry mass is collected into stockpile ridges.
  • a wheeled loader 13 equipped with a crushing sieve bucket 14 (mesh size 40 mm, generally 25 - 60 mm), a manure-spreader device, collector trailers, a bucket, and, for example, a ridge windrower, with the aid of which the dry mass is collected into stockpile ridges.
  • a production of at least 30 000 - 120 000 cubic metres per hectare per annum m 2 /ha/a
  • Bark mass coming from a de-barking plant is extremely wet, so that it is worth pre-drying it mechanically prior to field drying.
  • the free water is effectively removed from the bark mass using a drum dryer.
  • the drum is marked with the reference number 26 and the chain-mesh conveyor rotating against it with the reference number 28. This rotates through the effect of friction created by the rotation of the drum 26 and the bark mass along with it.
  • the bark mass C is brought by the conveyor 24 to the chain-mesh conveyor 28, which consists of a chain mesh 31 set on idlers 29 and 30, as well as spring-loaded counter drums 33 arranged inside the mesh loop. These press the mass against the drum 26, so that water is pressed out of the mass and the mechanically dried mass drops onto a lower conveyor 35.
  • the speed of rotation of the drum can be used to vary the pressing time. By setting different speeds in the drum and in the chain mesh, rubbing is also created, which further increases water removal from the bark mass.
  • the spreading layers have been referred to nominally in centimetres. This is, however, often an imprecise definition, as the layer thickness cannot be measured precisely. Instead, the spreading layer can be defined precisely with the aid of square masses, from which it is also possible to calculate the amount of water to be evaporated.
  • the 5-cm spreading layer referred to above of a bark mass with a water content of 75 %, refers to a 3,6 kg/m 2 layer of solids, which will dry to a 50 %-target moisture content in 10 hours.
  • the effect of heating from beneath is from calculation. Though its output would only be 2 - 10 % of maximum solar radiation power (800 W/m 2 ), its continuous operating time makes it a significant addition, as it is 10 - 50 % of the 150 W/m 2 daily mean power of the production season. For example, using even a modest level of heating from beneath, the drying days can increase from 100 to 200 annually.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Sludge (AREA)
EP05397006A 2004-02-17 2005-02-17 Verfahren zur Trocknung von nassen Abfallstoffen. Withdrawn EP1564515A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20045042A FI20045042A0 (fi) 2004-02-17 2004-02-17 Menetelmä märkien jätemateriaalien kuivatuksessa
FI20045042 2004-02-17

Publications (2)

Publication Number Publication Date
EP1564515A2 true EP1564515A2 (de) 2005-08-17
EP1564515A3 EP1564515A3 (de) 2011-04-27

Family

ID=31725809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05397006A Withdrawn EP1564515A3 (de) 2004-02-17 2005-02-17 Verfahren zur Trocknung von nassen Abfallstoffen.

Country Status (2)

Country Link
EP (1) EP1564515A3 (de)
FI (2) FI20045042A0 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010089342A1 (en) * 2009-02-04 2010-08-12 Shell Internationale Research Maatschappij B.V. Process to convert biomass
US20110097680A1 (en) * 2009-10-26 2011-04-28 Vapo Oy Method for heating the inlet air of a biomass dryer by means of an intermediate circuit and utilizing the circulating heating liquid of the dryer when the factory producing liquid biofuels is integrated with another factory
ES2359900A1 (es) * 2008-09-26 2011-05-30 Netporc Xxi, S.L. Sistema y proceso para el secado mediante aire de lodo líquido, y máquina para realizar surcos en el lodo líquido secado según dicho sistema y proceso.
CN103486825A (zh) * 2013-07-01 2014-01-01 江西省崇义华森竹业有限公司 一种利用竹胶板热压余热水烘干竹帘的方法
CN104180620A (zh) * 2014-07-23 2014-12-03 鑫田集团有限公司 汽车散热装置的自动吹水设备
EP2275763B1 (de) * 2009-07-13 2015-03-04 KOMPOFERM GmbH Vorrichtung zur Behandlung von Material, insbesondere von Gärresten oder Gärrestmischungen
CN107401898A (zh) * 2017-09-18 2017-11-28 嘉善农马环保科技有限公司 一种便于食品加工用食材晾晒装置架
CN112815299A (zh) * 2021-01-07 2021-05-18 西安热工研究院有限公司 一种固体生物质燃烧装置及方法
CN114621015A (zh) * 2022-03-29 2022-06-14 北京喜诺德科技有限公司 一种岩板压制成形用粉料干法生产方法及设备

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5405092A (en) * 1993-03-04 1995-04-11 Ideachip Oy Screen crusher for soil materials
DE19836268A1 (de) * 1998-08-11 2000-02-24 Ist Anlagenbau Gmbh Vorrichtung zum Trocknen von Schlamm und/oder von den Inhaltsstoffen verschmutzter Flüssigkeiten
US6076279A (en) * 1998-01-09 2000-06-20 Finbark Oy Method and a device for improving liquid removal
EP1094159A2 (de) * 1999-10-22 2001-04-25 EnviroSolve Corporation Niedrigtemperaturvedampfungsbecken mit thermischer Unterstützung
DE20304220U1 (de) * 2003-03-17 2003-05-28 Grimm Willi Vorrichtung zum Trocknen von Schlamm
WO2004020921A1 (fr) * 2002-08-28 2004-03-11 Degremont Installation de sechage de dechets, notamment de boues d'epuration d'eaux
EP1416241A2 (de) * 2002-10-30 2004-05-06 PAL-Bullermann GmbH Einrichtung zum Trocknen von Schlämmen
EP1524310A1 (de) * 2003-10-17 2005-04-20 Vapo Oy Verfahren und Vorrichtung zur Herstellung von Gartenbautorf und Torfbrennstoff und ein Torfbrennstoffprodukt

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5405092A (en) * 1993-03-04 1995-04-11 Ideachip Oy Screen crusher for soil materials
US6076279A (en) * 1998-01-09 2000-06-20 Finbark Oy Method and a device for improving liquid removal
DE19836268A1 (de) * 1998-08-11 2000-02-24 Ist Anlagenbau Gmbh Vorrichtung zum Trocknen von Schlamm und/oder von den Inhaltsstoffen verschmutzter Flüssigkeiten
EP1094159A2 (de) * 1999-10-22 2001-04-25 EnviroSolve Corporation Niedrigtemperaturvedampfungsbecken mit thermischer Unterstützung
WO2004020921A1 (fr) * 2002-08-28 2004-03-11 Degremont Installation de sechage de dechets, notamment de boues d'epuration d'eaux
EP1416241A2 (de) * 2002-10-30 2004-05-06 PAL-Bullermann GmbH Einrichtung zum Trocknen von Schlämmen
DE20304220U1 (de) * 2003-03-17 2003-05-28 Grimm Willi Vorrichtung zum Trocknen von Schlamm
EP1524310A1 (de) * 2003-10-17 2005-04-20 Vapo Oy Verfahren und Vorrichtung zur Herstellung von Gartenbautorf und Torfbrennstoff und ein Torfbrennstoffprodukt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LUBOSCHIK U: "Solar sludge drying - based on the IST process", RENEWABLE ENERGY, PERGAMON PRESS, OXFORD, GB, vol. 16, no. 1-4, 4 January 1999 (1999-01-04), pages 785-788, XP004138114, ISSN: 0960-1481, DOI: DOI:10.1016/S0960-1481(98)00281-X *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2359900A1 (es) * 2008-09-26 2011-05-30 Netporc Xxi, S.L. Sistema y proceso para el secado mediante aire de lodo líquido, y máquina para realizar surcos en el lodo líquido secado según dicho sistema y proceso.
WO2010089342A1 (en) * 2009-02-04 2010-08-12 Shell Internationale Research Maatschappij B.V. Process to convert biomass
EP2275763B1 (de) * 2009-07-13 2015-03-04 KOMPOFERM GmbH Vorrichtung zur Behandlung von Material, insbesondere von Gärresten oder Gärrestmischungen
US20110097680A1 (en) * 2009-10-26 2011-04-28 Vapo Oy Method for heating the inlet air of a biomass dryer by means of an intermediate circuit and utilizing the circulating heating liquid of the dryer when the factory producing liquid biofuels is integrated with another factory
CN103486825A (zh) * 2013-07-01 2014-01-01 江西省崇义华森竹业有限公司 一种利用竹胶板热压余热水烘干竹帘的方法
CN103486825B (zh) * 2013-07-01 2016-05-18 江西省崇义华森竹业有限公司 一种利用竹胶板热压余热水烘干竹帘的方法
CN104180620A (zh) * 2014-07-23 2014-12-03 鑫田集团有限公司 汽车散热装置的自动吹水设备
CN107401898A (zh) * 2017-09-18 2017-11-28 嘉善农马环保科技有限公司 一种便于食品加工用食材晾晒装置架
CN112815299A (zh) * 2021-01-07 2021-05-18 西安热工研究院有限公司 一种固体生物质燃烧装置及方法
CN114621015A (zh) * 2022-03-29 2022-06-14 北京喜诺德科技有限公司 一种岩板压制成形用粉料干法生产方法及设备
CN114621015B (zh) * 2022-03-29 2022-12-09 北京喜诺德科技有限公司 一种岩板压制成形用粉料干法生产方法及设备

Also Published As

Publication number Publication date
FI7014U1 (fi) 2006-03-20
FI20045042A0 (fi) 2004-02-17
FIU20050396U0 (fi) 2005-11-28
EP1564515A3 (de) 2011-04-27

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