Production of wood pellets by heating wet wood chips, wood shavings, wood pulp and/or saw residual materials useful in private household area and power plant, by withdrawing the chips in a drying pit by air heated over upper heat exchanger

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Title:
Production of wood pellets by heating wet wood chips, wood shavings, wood pulp and/or saw residual materials useful in private household area and power plant, by withdrawing the chips in a drying pit by air heated over upper heat exchanger
Author: MIDDEL, JOHANNES ; GERDING, LEO
Subjects: ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL ; BLASTING ; CHEMISTRY ; DRYING ; DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM ; FIRELIGHTERS ; FUELS ; FUELS NOT OTHERWISE PROVIDED FOR ; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC ; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS ; HEATING ; LIGHTING ; LIQUEFIED PETROLEUM GAS ; LUBRICANTS ; MECHANICAL ENGINEERING ; METALLURGY ; NATURAL GAS ; PEAT ; PETROLEUM, GAS OR COKE INDUSTRIES ; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION ; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K ; TECHNICAL GASES CONTAINING CARBON MONOXIDE ; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE ; WEAPONS
Description: The production of wood pellets (1) by heating wet wood chips (2), wood shavings, wood pulp and/or saw residual materials useful in private household area and in power plant, comprises withdrawing the wood chips conveyed from a sliding base (5) to a large extent vertically towards the top during the constant downward movement in a drying pit within an upper drying pit section by air heated over an upper heat exchanger in a cross-flow process of humidity, drying the wood chips in a lower drying pit section in a counter cross-flow process, and supplying the stored wood chips to a pellet process. The production of wood pellets (1) by heating wet wood chips (2), wood shavings, wood pulp and/or saw residual materials useful in private household area and in power plant, comprises withdrawing the wood chips conveyed from a sliding base (5) to a large extent vertically towards the top during the constant downward movement in a drying pit within an upper drying pit section by air heated over an upper heat exchanger in a cross-flow process of the humidity, drying the wood chips in a lower drying pit section in a counter cross-flow process by sucking the wet air and then storing in an intermediate silo, supplying the stored wood chips to a pellet process and then pressing under controlling the temperature in the form of the wood pellets, cooling the pressed wood pellets in a cooler at 30[deg] C, storing the pellets in pellet silos and carrying out a temperature monitoring. Before the pelleting, the wood chips are minced in a hammer mill into uniform grain sizes, which are controllably wetted the chip mix and then stored in a ripening container connected before a pellet press. The chip mix heated in the pellet-press by friction is pressed in a rotating edge mill through a matrix with defined hole size. Lignin is mixed as additional material up to 1% for pressing the wood chips before the press process. A fine portion developed during the pelleting is separated and sucked-off by sieving the wood pellets. The dust portion is sieved by renewing before packing and/or filling the wood pellets. The weight of the wood pellets affiliated in a silo vehicle is determined by balancing the empty and filled silo vehicle. An independent claim is included for: (1) a device for the production of wood pellets from basis material; and (2) a device for drying wood chips, wood shavings, wood pulp and/or saw residual materials. Ein Verfahren und eine Einrichtung zum Herstellen von Holzpellets (1) beruht auf einem vertikalen Trocknungsschacht (11), bei dem kontinuierlich von oben zugeführte feuchte Holzspäne (2) durch in einem oberen Wärmetauscher (12a) erwärmte Luft und einem oberen Ventilator (13a) in einem Querstromverfahren (50) und einem unteren Wärmetauscher (12b) mit einem unteren Ventilator (13b) die Feuchtigkeit in einem Gegen-Querstromverfahren (50) entzogen wird, wobei der Trockner mit dem Trocknungsschacht (11) in übereinander gestapelten Containern (18) mit Aggregaten in Baugruppen-Modulen (16), die in Funktions-Baugruppen (16a) zusammengeschaltet sind, gebildet ist.
Creation Date: 2008
Language: English;German
Source: esp@cenet


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Production of wood pellets by heating wet wood chips, wood shavings, wood pulp and/or saw residual materials useful in private household area and power plant, by withdrawing the chips in a drying pit by air heated over upper heat exchanger

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