EP2411749A1 - Système et procédé de séchage - Google Patents

Système et procédé de séchage

Info

Publication number
EP2411749A1
EP2411749A1 EP09842392A EP09842392A EP2411749A1 EP 2411749 A1 EP2411749 A1 EP 2411749A1 EP 09842392 A EP09842392 A EP 09842392A EP 09842392 A EP09842392 A EP 09842392A EP 2411749 A1 EP2411749 A1 EP 2411749A1
Authority
EP
European Patent Office
Prior art keywords
drying
gases
gas
combustion
air
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Withdrawn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
EP09842392A
Other languages
German (de)
English (en)
Other versions
EP2411749A4 (fr
Inventor
Lennart Granstrand
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.)
SAXLUND INTERNATIONAL HOLDING AB
Original Assignee
Svensk Rokgasenergi Intressenter AB
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 Svensk Rokgasenergi Intressenter AB filed Critical Svensk Rokgasenergi Intressenter AB
Publication of EP2411749A1 publication Critical patent/EP2411749A1/fr
Publication of EP2411749A4 publication Critical patent/EP2411749A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
    • 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
    • F26B2200/24—Wood particles, e.g. shavings, cuttings, saw dust
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the invention concerns a system for drying according to the preamble of claim 1.
  • the invention also concerns a method for drying according to the preamble of claim 12.
  • hydrocarbon compounds are emitted from the material intended for drying in concentrations that are higher the higher the temperature is of the drying gases.
  • a flue gas conduit is connected from a furnace to a drying device, wherein used flue gases/drying gases contain high concentrations of hydrocarbon compounds .
  • the gas heating device includes a heat exchanger, for heat exchange between a flow of flue gases generated in the combustion device and a flow of said drying gases driven forward by a driving device in a conduit circuit, and that the conduit circuit exhibits on the one hand an air intake for oxygen containing air, on the other hand a gas discharge for the connection to an intake for air for combustion to the combustion device.
  • the flue gases from the furnace can through modern firing technology be brought to contain much lower or negligible concentrations of for example hydrocarbon compounds.
  • the conduit circuit for the drying gases with an air intake for oxygen containing air, and discharging the air for combustion to the combustion device from there, a number of advantages are obtained. Firstly, it is achieved that hydrocarbon compounds absorbed into the drying gases in the drying device are passed over the gas outlet to the combustion device in order to participate in the combustion process therein and thus, add useful energy to the process. Secondly it is achieved that no particular purification device or the like is necessary for eliminating or reducing the hydrocarbon compounds in the flue gases emitted by the system. Thirdly, it is achieved that the great amounts of water, which emanate from the material intended for drying are supplied to the combustion process in the combustion device, which can be a great advantage during subsequent possible flue gas condensation with adherent possible energy recovery. Particularly advantageous is that said gas outlet is positioned downstream of the drying device and upstream of the heat exchanger, wherein in particular it is preferred that said air intake is positioned downstream of said gas outlet and downstream of the heat exchanger.
  • a flue gas condenser having means for heat recovery is placed in a flue gas conduit downstream of the heat exchanger, and in particular that said means for heat recovery is connected to a hot air generator for the production of a stream of hot drying gases to a second drying device .
  • This second drying device is preferably a low temperature dryer, wherein relatively low emissions of hydrocarbon compounds are produced. It is preferred that used drying gases emanating from this second drying device are passed on to and united with a conduit for flue gases from the furnace after the heat exchanger as well as the flue gas condenser.
  • conduit circuit for drying gases being provided with a by-pass conduit for leading away a portion of gases flowing through the drying device passed the heat exchanger, it is achieved that the drying gas temperature in the drying device can be controlled and typically be reduced from the relatively the high temperature which prevails directly after the heat exchanger. Hereby it is possible to adapt to and increase the quality of the dried material.
  • control unit for controlling at least one from the group: gas flows, flow of heat carrying medium, fuel flow to the combustion device, flow of material intended for drying.
  • the control is advantageously based of anyone or more of: sensed oxygen contents in the flue gases after the combustion device, heat requirement in the drying device, the quantity of material to be dried etc.
  • Fig. 1 diagrammatically shows a system for drying according to the invention
  • Fig. 2 diagrammatically shows a flow schedule over a method sequence according to the invention.
  • the invention concerns a system and a method for drying an organic particle-shaped material, wherein the invention in particular is used in respect of drying sawdust, chips or the like material emanating from wood.
  • the invention in particular is used in respect of drying sawdust, chips or the like material emanating from wood.
  • such materials are dried in order to subsequently be used as fuel in furnaces for renewable fuels, such as furnaces for pellets, furnaces for firing wood chips etc.
  • furnaces for renewable fuels such as furnaces for pellets, furnaces for firing wood chips etc.
  • typically dried particle-shaped material is pressed together into pellets of suitable size for subsequent combustion.
  • sawdust As concerns sawdust, this is a residual product from saw mills and as a rule has a very high water contents because of the cooling of the saw blades during sawing with flows of water. Resulting sawdust hereby absorb water to a high extent and must be subjected to drying to be useable as fuel.
  • a plant based on a system according to the present invention can very well be positioned close to a saw mill for locally being an important component in the chain for providing directly usable renewable fuel and for avoiding long transports of raw material in the form of highly moist sawdust, wood chips etc.
  • Fig. 1 is diagrammatically shown, within the rectangle marked with interrupted lines, a system according to the invention, wherein 1 indicates a combustion device for firing organic material such as for example bark, wood chips or the like transported over a transportation device indicated with 10.
  • a combustion device for firing organic material such as for example bark, wood chips or the like transported over a transportation device indicated with 10.
  • the drying device 5 can be of a conventional kind and is suitably a drum dryer, through which the material intended for drying is transported continuously and brought to come into direct contact with the drying gases in the conduit circuit 4, 4' . Material intended for drying is led into the drying device 5 over a first conduit 13 and the dried material is discharged from the drying device 5 over a discharged conduit 14.
  • the drying gases will contain water to an extent that is determined by the providing parameters, but it is preferred that the operation is such at the drying gases directly downstream of the drying device are essentially saturated with moisture .
  • Oxygen contained in the air/gas supplied through the air intake 6' will thus be mixed into the drying gases in the conduit portion 4, to pass through the heat exchanger 23, where it is heated, be driven by the blower 12 and participate in the drying process inside the drying device 5 in order to subsequently be taken out through the gas discharge 7' and subsequently end up inside the combustion device 1 as oxygen to the combustion process in the combustion device 1.
  • Recovered heat from the flue gas condenser 16 can be used in a desired way, but a preferred use is to use the heat in a heating element for drying gases, which are used for drying organic particle-shaped material in a second drying device 17.
  • a heating element for drying gases which are used for drying organic particle-shaped material in a second drying device 17.
  • means 18 belong for creating an air stream through a channel 23 with a fresh air intake, a heat exchanger 19 for heating drying gases being connected to the flue gas condenser over a heat carrier circuit 38, to the second drying device 17.
  • Material intended for drying is led into the drying device 17 over a first conduit 43 and a dried material is discharged over a discharge conduit 44. From this second drying device 17 a relatively small amount of hydrocarbon compounds will be emitted because of the relatively low drying temperature.
  • Emitted and used drying gas from the second drying device 17 is led over a discharge channel 21 to a flue gas conduit 22 downstream of the heat exchanger as well as the flue gas condenser 16 for further transport for example to a chimney belonging to the system.
  • the channel 6 for oxygen gas containing air/gas has a direct intake for oxygen containing fresh air, which is indicated with interrupted line at 9.
  • the channel 6 for oxygen gas containing air/gas has instead of a fresh air intake (at 9) a connection to a channel 20, which has a connection at 20' to the discharge channel 21 from the second drying device 17.
  • a portion of the gases in this discharge which is preferably saturated with water, is led as oxygen containing gas component to the conduit circuit 4, whereupon the formed mix is heated, as is indicated above, in the heat exchanger 3, in order there from, in a heated state, to form the drying gas for the drying device 5.
  • gas with oxygen contents according to the above is discharged from the conduit circuit 4 through the channel 7 to the combustion device 1.
  • a control unit 15 is arranged to control the process, whereby preferably all gas flows can be controlled in respect of their speeds as flows, flows of gases and heat carrying medium are controlled, the fuel flow to the combustion device 1 is controlled as well as the flows of material intended for drying through the drying device 5 as well as the second drying device 17.
  • As input data (see interrupted lines in the figure) to the control unit 15 are supplied signals concerning composition of flue gases after the heat exchanger 3 respectively after the end of the discharge channel 21. Further, signals from sensors for temperature in heat exchanger, drying devices and possibly also in gas conduits.
  • the channel 7 is suitably provided with a device for preheating the air for combustion (not shown) , i.a. in order to avoid condensation problems in the conduit 7.
  • a by-pass conduit 8 is suitably provided in the conduit circuit for drying gases 4, 4', wherein a portion of the gases flowing through the drying device are led passed the heat exchanger 3 in order i.a. to ensure a lower drying gas temperature through the drying device 5.
  • a by-pass conduit can be arranged such that it joins the channel 7 over the channel 8 to the conduit portion 4' .
  • different types of controllable throttle valves or the like can be provided, for example in the channels 2, 4, 4', 6, 7, and of course blowers, such as the blowers 11, 12 and 18, can be controllable such that the flow through the respective channels can be regulated.
  • FIG. 2 there is diagrammatically shown a flow chart concerning a method sequence according to the invention, wherein
  • Position 30 indicates the start of the sequence.
  • Position 31 concerns leading material intended for drying into a drying device in order to come into contact with drying gases therein
  • Position 32 indicates generating flue gases in a combustion device and heat exchanging of the flue gases with a flow of said drying gases
  • Position 33 concerns intake of air into the conduit circuit for drying gases and discharge of gas for transfer as air for combustion to the combustion device.
  • Position 34 indicates condensation of flue gases in connection with heat recovery in a flue gas conduit downstream of the heat exchanger
  • Position 35 indicates the end of the sequence.
  • a combustion device generates an effect of 10 MW
  • 20 000 kilograms of moist sawdust is transferred to a drying device per hour and 10 000 kilograms of dried sawdust (10% moist contents) is discharged from the drying device per hour.
  • 10 000 kilogram water per hour is led to the combustion device 1 over the discharge 7' and the channel 7 in Fig. 1.
  • the said 10 000 kilograms of water per hour is condensed and further 2800 kilograms of water per hour emanating on the one hand from water generated through the combustion itself, on the other hand moisture contained in the fuel.
  • hereby 12.8 MW is recovered and from a second drying device is taken out from an inlet flow of 24 000 kilogram moist sawdust per hour 12 000 kilograms of dried sawdust (10% water) per hour, whereas water absorbed by the drying gases in the second drying device is passed on to a chimney for the system.
  • the proportion of hydrocarbons typically is very close to zero because of use of a good combustion in the combustion device 1.
  • As fuel to the combustion device 1 is suitably used bark, chips of the like, whereby is supplied 6350 kilograms of such fuel per hour.
  • combustion devices can be used as well as different types of drying devices. It is thus preferred that there is provided flue gas heat recovery after the heat exchanger and in particular that this is made, as is indicated above, in the form of so called low temperature drying. It is, however, not excluded that the recovered energy is used for other purposes such as for example heating of buildings through district heating, local heating or the like.

Abstract

L'invention concerne un système et un procédé de séchage d'un matériau organique sous forme de particules comprenant un dispositif de chauffage à gaz (1, 3) pour la production de gaz de séchage chauds destinés à être envoyés vers un dispositif de séchage (5), à travers lequel le matériau destiné à être séché est disposé de façon à être dirigé et amené en contact avec lesdits gaz de séchage, le dispositif de chauffage à gaz comprenant un dispositif de combustion (1). Le dispositif de chauffage à gaz comprend un échangeur de chaleur (3), pour l'échange de chaleur entre un flux de gaz effluents générés dans le dispositif de combustion (1) et un flux desdits gaz de séchage poussé vers l'avant par un dispositif d'entraînement (12) dans un circuit de conduit (4, 4'), et le circuit de conduit (4, 4') présentant d'une part une admission d'air (6') pour l'air contenant de l'oxygène, et d'autre part une évacuation de gaz (V) pour le raccordement à une admission d'air pour la combustion au niveau du dispositif de combustion (1).
EP09842392.4A 2009-03-25 2009-03-25 Système et procédé de séchage Withdrawn EP2411749A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2009/000158 WO2010110702A1 (fr) 2009-03-25 2009-03-25 Système et procédé de séchage

Publications (2)

Publication Number Publication Date
EP2411749A1 true EP2411749A1 (fr) 2012-02-01
EP2411749A4 EP2411749A4 (fr) 2016-01-20

Family

ID=42781233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09842392.4A Withdrawn EP2411749A4 (fr) 2009-03-25 2009-03-25 Système et procédé de séchage

Country Status (2)

Country Link
EP (1) EP2411749A4 (fr)
WO (1) WO2010110702A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1429972A (en) * 1973-08-24 1976-03-31 Duur Kg Otto Process of and apparatus for heating circulating air in drying quipment
US4132007A (en) * 1977-08-17 1979-01-02 Voorheis James T Single burner heater and incinerator
DE3616333C1 (de) * 1986-05-15 1987-04-16 Krantz H Gmbh & Co Verfahren zum thermischen Reinigen der Abgase einer Waermebehandlungsvorrichtung
DE4017806A1 (de) * 1990-06-01 1991-12-05 Koerting Ag Verfahren und anlage zur kontinuierlichen trocknung von holzspaenen, holzfasern oder anderen schuettguetern
NL9100606A (nl) * 1991-04-08 1992-11-02 Vandenbroek Int Bv Drooginrichting.
DE59501167D1 (de) * 1994-11-24 1998-02-05 Kunz Drytec Ag W Verfahren zum Trocknen einer Substanz, insbesondere von Holzspänen
DE19654043C2 (de) * 1996-12-23 1998-05-28 Martin Dipl Ing Knabe Trockner mit Abgasreinigung mittels thermischer Nachverbrennung
ATE520939T1 (de) * 2008-01-10 2011-09-15 Douglas Technical Ltd Verfahren zur kontinuierlichen trocknung von schüttgut, insbesondere von holzfasern und/oder holzspänen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010110702A1 *

Also Published As

Publication number Publication date
EP2411749A4 (fr) 2016-01-20
WO2010110702A1 (fr) 2010-09-30

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