EP2889537B1 - Installation de combustion avec installation de séchage - Google Patents

Installation de combustion avec installation de séchage Download PDF

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Publication number
EP2889537B1
EP2889537B1 EP14405092.9A EP14405092A EP2889537B1 EP 2889537 B1 EP2889537 B1 EP 2889537B1 EP 14405092 A EP14405092 A EP 14405092A EP 2889537 B1 EP2889537 B1 EP 2889537B1
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EP
European Patent Office
Prior art keywords
drier
hot
rotor
gas
belt
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.)
Not-in-force
Application number
EP14405092.9A
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German (de)
English (en)
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EP2889537A1 (fr
Inventor
Rupert Kaindl
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Individual
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Individual
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • 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
    • F26B23/028—Heating arrangements using combustion heating using solid fuel; burning the dried product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/20—Drying
    • 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

Definitions

  • the invention relates to a combustion plant with a drying plant for drying moist material, especially biomass such as wood, especially in the form of wood chips, sawdust or crushed wood bark.
  • EP 0 714 006 A1 discloses a generic combustion plant with a drying plant for drying moist material.
  • the moisture content of the material in such systems usually fluctuates greatly, so that in its further use, especially combustion, difficulties often occur or to set a desired moisture content energetically unfavorable or other cost-increasing preparatory measures are required as mixing with dry material or admixture of water ,
  • the invention is based on the object to provide generic combustion systems in which the moisture content of the dried material can be well adjusted, in a manner which allows energy-saving operation. This object is achieved by the invention as characterized in the claims.
  • the material is predried in the belt dryer and then finish-dried to the desired moisture content in a rotor dryer in which the degree of drying is readily controllable.
  • the lower temperatures in the belt dryer make it possible to reuse hot gas, which contains flue gas produced during combustion and which has already been used in the rotor dryer, in the belt dryer. As a result, a considerable energy saving is achieved.
  • the hot gas is filtered.
  • Fig. 1 shows an inventive incineration plant comprising a drying plant.
  • the incinerator accordingly has a furnace 1 with boilers in which the heat of combustion for heating water or thermal oil eg for heating purposes is being used.
  • a discharge 2 is arranged at the lower end of the furnace 1.
  • a material feed 3 is followed immediately by a material feed of a subsequent drying plant 4, which comprises a belt dryer 5, a following in the material flow direction on this following Vorsilo 6 and a subsequent rotor dryer 7.
  • a closed screen belt 8 is arranged with an upper run and a lower run, which run over several rollers. Its right end is below the material task 3, its left end above the Vorsilos 6.
  • a heater 9 is also attached.
  • the Vorsilo 6 is closed in the region of its lower end by a designed as a flap 10 separating device, i. separable from the subsequent rotor dryer 7.
  • the dry silo 12 is conveyed by a conveyor 13, e.g. Screw conveyor, chain conveyor or a moving floor, connected to the furnace 1.
  • a conveyor 13 e.g. Screw conveyor, chain conveyor or a moving floor
  • a flue gas line 14 goes out, at the successive in terms of flow direction, a pre-separator 15 and, combined in a single unit, a precooler 16 and a Spark detection path 17 with a common dust collecting vessel are arranged.
  • a hot gas guide passes through the rotor dryer 7 and the belt dryer 5 and comprises a parallel to Vorsilo 6 connecting portion 18 between them. The latter opens into an outlet 19 above the left end of the screen belt 8 or laterally thereof.
  • a trigger 20 is arranged, which is connected via a fan 21 with a chimney 22. If very low dust levels of the exhaust gas are required, a filter, for example a fabric filter, can be installed in front of the fan 21 for dedusting the exhaust gas.
  • a condenser in which the exhaust gas is cooled can be provided in front of the fan 21 and optionally after the filter.
  • the condensation heat removed from the exhaust gas can be used.
  • a heating register 23 is arranged in the area of the mouth of the hot gas guide in the rotor dryer 7.
  • the hot gas guide comprises an air feed 24 with a fan 25.
  • the flue gas line 14 opens between the fan 25 and the rotor dryer 7 in the hot gas guide.
  • a passage 26 is arranged, which the flue gas line 14 directly to the connecting portion 18th combines.
  • a switch designed as a flap 27 closes the passage 26 in a first position, so that the air feed 24 and the flue gas line 14 are connected only via the rotor dryer 7 to the connecting section 18 and further to the belt dryer 5, while in a second position the passage 26 leaves open, but the rotor dryer 7 separates from the connecting portion 18, so that the air supply line 24 and the flue gas line 14 with this and the belt dryer 5 directly, bypassing the rotor dryer 7, are connected.
  • a bypass branch 28 from the flue gas line 14 with a bypass line 29, which leads via a closing device designed as a flap 30 and a fan 31 to a chimney 32.
  • a closing device designed as a flap 30 and a fan 31 to a chimney 32.
  • Another flap 33 is arranged with respect to the flow direction of the flue gas just behind the junction of the bypass line 29 of the flue gas duct 14 in the latter.
  • the material usually wet biomass such as sawdust or woodchips, whose material flow is indicated by solid arrows is introduced through the material task 3 and falls on the belt dryer 5, more precisely on the right end of the upper run of the wire 8, on which it is a uniformly thick Layer forms. From this it is slowly transported to the left end of the said strand, from which it falls into the prefix 6.
  • the flap 10 is usually closed, so that the material accumulates in Vorsilo 6 for a while. Then, the flap 10 is opened for a short time and accumulated in Vorsilo 6 material falls into the rotor dryer. 7
  • the flap 11 of the rotor dryer 7 is opened and the material falls into the underlying dry silo 12. From there it transports the conveyor 13 into the furnace 1, where it is burned. The flap 11 is closed again and the flap 10 is opened briefly, so that the accumulated in Vorsilo 6 material falls into the rotor dryer 7 and the same is reloaded.
  • the flue gas whose flow is indicated by long-dashed arrows, flows first into the pre-separator 15, where larger dust and ash particles are separated and discharged and on to the precooler 16 and the spark detection path 17, where any spark is detected and extinguished, so that further transport of burning particles into the drying plant 4 is prevented.
  • a hot gas is produced, the temperature is below a threshold temperature before it is passed into the rotor dryer 7 and on the material hits.
  • the limit temperature is set so that evaporation of hydrocarbons from the material, which could lead to undesirable contamination of the hot gas (formation of 'blue haze') is avoided.
  • the limit temperature depends on the type of material. For wood, it is about 120 ° C. If necessary, additional hot air can be introduced into the rotor dryer 7 to increase the dryer output with the heating register 23.
  • the hot gas strikes the material and promotes its drying, thereby cooling itself, i. Energy, composed of sensible heat and the condensation of water vapor resulting condensation heat, gives off. It then flows through the connecting section 18 further into the belt dryer 5, where it exits from the outlet 19 in the region lying over the left end of the wire 8. Since at the same time by the fan 21 on the trigger 20, a negative pressure is generated, the flue gas-air mixture flows from top to bottom through the layer of wet material, which lies on the upper run of the wire 8 and through said upper strand. In this case, the material, in turn, with cooling of the hot gas, pre-dried before it enters the rotor dryer 7.
  • the hot gas is filtered by flowing through the layer of material.
  • small dust and ash particles are deposited. Therefore, the hot gas usually meets the legal requirements, which set the usual upper limits for the dust content and can be blown off without exhaustive cleaning measures as exhaust gas through the chimney 22 into the open.
  • the chimney may be preceded by a filter or a condenser or both.
  • the drying of the material can be supported by the heating register 9. While the flap 27 is usually in the in Fig. 1 shown, so that the hot gas flows through the rotor dryer 7, it is held during the unloading and reloading of the rotor dryer 7 in the second position in which the flue gas-air mixture directly, bypassing the rotor dryer 7, from the Flue gas duct 14 flows into the connecting portion 18 and further into the belt dryer 5.
  • the bypass branch 28 allows it to be used in emergencies, e.g. in case of a fault in the drying plant 4, the passage of the flue gas through the same to interrupt.
  • the precooler is not essential, since sufficient cooling can be achieved by fresh air alone.
  • the heating registers can also often be omitted.
  • the drying plant can also be used independently of a furnace and instead of flue gas or a flue gas-air mixture, for example. Only hot air can be used as hot gas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Claims (9)

  1. Installation de combustion qui comprend une installation de chauffe (1) et une conduite de gaz de fumée (14) qui part de celle-ci, et qui comprend également une installation de séchage (4) pour le séchage de matériau humide, qui comporte une entrée de matériau ainsi qu'un séchoir à bande (5) avec une bande tamis (8), et une conduite de gaz chaud avec une sortie (19) et une évacuation (20) qui sont disposées de telle sorte que l'écoulement de gaz chaud croise le brin supérieur de la bande tamis (8) et que le gaz chaud traverse le matériau qui se trouve dessus, l'installation de séchage (4) comporte également un séchoir à rotor (7) disposé en aval du séchoir à bande (5), dans le sens du flux de matériau, et la conduite de gaz chaud, par rapport au sens d'écoulement du gaz chaud, traverse le séchoir à rotor (7) en amont du séchoir à bande (5),
    caractérisée en ce que la conduite de gaz de fumée (14) qui part de l'installation de chauffe (1) débouche dans la conduite de gaz chaud en amont du séchoir à rotor (7), par rapport au sens d'écoulement du gaz chaud.
  2. Installation de combustion selon la revendication 1, caractérisée en ce que le séchoir à rotor (7) est disposé au-dessous d'une extrémité d'évacuation du séchoir à bande (5), et est relié à celui-ci par un pré-silo (6) pourvu d'un dispositif de séparation.
  3. Installation de combustion selon l'une des revendications 1 ou 2, caractérisée en ce qu'il est prévu à l'extrémité d'évacuation du séchoir à rotor (7) un dispositif de séparation.
  4. Installation de combustion selon l'une des revendications 1 à 3, caractérisée en ce que la conduite de gaz chaud comprend une conduite d'amenée d'air (24) qui se trouve en amont de l'installation de séchage (4), par rapport au sens d'écoulement du gaz chaud.
  5. Installation de combustion selon l'une des revendications 1 à 4, caractérisée en ce qu'elle comprend un aiguillage, disposé dans la zone où la conduite de gaz chaud débouche dans le séchoir à rotor (7), qui est apte à être manoeuvré entre une première position dans laquelle ladite zone est reliée au séchoir à bande (5) par l'intermédiaire du séchoir à rotor (7), et une seconde position dans laquelle ladite zone est reliée au séchoir à bande (5) en évitant le séchoir à rotor (7).
  6. Installation de combustion selon l'une des revendications 1 à 5, caractérisée en ce que la conduite de gaz chaud comprend un registre de chauffage (23) qui est disposé en amont de l'installation de séchage (4), par rapport au sens d'écoulement du gaz chaud.
  7. Installation de combustion selon l'une des revendications 1 à 6, caractérisée en ce qu'il est prévu dans le séchoir à bande (5) un registre de chauffage (9).
  8. Installation de combustion selon l'une des revendications 1 à 7, caractérisée en ce que la conduite de gaz chaud comprend un filtre qui est disposé en aval de l'installation de séchage (4), par rapport au sens d'écoulement du gaz chaud.
  9. Installation de combustion selon l'une des revendications 1 à 8, caractérisée en ce que le côté évacuation du séchoir à rotor (7) est relié à l'installation de chauffe (1).
EP14405092.9A 2013-12-04 2014-11-28 Installation de combustion avec installation de séchage Not-in-force EP2889537B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH02007/13A CH708975B1 (de) 2013-12-04 2013-12-04 Verbrennungsanlage.

Publications (2)

Publication Number Publication Date
EP2889537A1 EP2889537A1 (fr) 2015-07-01
EP2889537B1 true EP2889537B1 (fr) 2018-03-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14405092.9A Not-in-force EP2889537B1 (fr) 2013-12-04 2014-11-28 Installation de combustion avec installation de séchage

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EP (1) EP2889537B1 (fr)
CH (1) CH708975B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3351885A1 (fr) 2017-01-23 2018-07-25 Rupert Kaindl Procédé de fonctionnement d'un séchoir pour bois humide et installation de séchage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59501167D1 (de) * 1994-11-24 1998-02-05 Kunz Drytec Ag W Verfahren zum Trocknen einer Substanz, insbesondere von Holzspänen
US5524361A (en) * 1995-02-14 1996-06-11 George Koch Sons, Inc. Flatline method of drying wafers
ES2371578T3 (es) * 2008-01-10 2012-01-05 Douglas Technical Limited Procedimiento para el secado continuo de producto a granel, en particular de fibras de madera y/o virutas de madera.
DE102011015769A1 (de) * 2011-04-01 2012-10-04 Christian Wenner Vorrichtung zur Trocknung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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Also Published As

Publication number Publication date
EP2889537A1 (fr) 2015-07-01
CH708975A2 (de) 2015-06-15
CH708975B1 (de) 2016-07-15

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