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Method for the rapid pyrolysis of lignocellulose

A lignocellulose and pyrolysis technology, applied in the field of rapid pyrolysis of lignocellulose, can solve the problems of limited thermal conductivity, high technical cost, incomplete CO combustion, etc.

Inactive Publication Date: 2008-08-06
KARLSRUHE FORSCHZENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Various problems may arise in this process, such as dealing with low melting point ash, potential risk of formation of toxic chlorinated-dioxins and chlorinated-furans, incomplete CO combustion, etc.
This problem can be avoided by indirect heating of the heat carrier from the outside in a heat exchanger, but this entails high technical costs due to the limited thermal conductivity

Method used

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  • Method for the rapid pyrolysis of lignocellulose
  • Method for the rapid pyrolysis of lignocellulose

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Embodiment Construction

[0039] As shown in FIG. 1 a , in a first step lignocellulose 1 is introduced as a stream into a mechanical comminution process 2 and subsequently into a drying process 4 in the form of lignocellulose particles 3 . It is preferable to preheat to 170 to 200° C. for drying, and then introduce the lignocellulose particles into the mixing process 5 mixed with the heat-conducting particles 6 , so as to perform the rapid pyrolysis process 7 together. In the fast pyrolysis range, the material is preferably conveyed by means of one or more conveying screws.

[0040] In the range of mixing and fast pyrolysis, the preferably preheated lignocellulosic particles are heated very quickly as described above. This process is achieved by transferring heat to the lignocellulosic particles from heat-conducting particles 6 heated to more than 350° C., preferably to about 500 to 650° C., preferably from a preheating temperature between 170 and 200° C. The lower onset temperature of the thermal pyr...

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Abstract

Method for fast pyrolysis of lignocellulose including: mechanically comminuting the lignocellulose to lignocellulose particles; at least one of completely drying and preheating the lignocellulose particles; mixing the lignocellulose particles with heat transfer particles so as to provide a mixture; heating the heat transfer particles, prior to the mixing, to a temperature between 500° C. and 650° C.; and heating, in a pyrolysis reactor with oxygen excluded, the lignocellulose particles using the heat transfer particles so as to establish a temperature between 400° C. and 600° C. for 1 to 50 seconds and so as to react the lignocellulose particles so as to provide pyrolysis coke, pyrolysis condensate, and pyrolysis gas.

Description

technical field [0001] The present invention relates to the method for rapidly pyrolyzing lignocellulose as claimed in claim 1. The method is made from biological materials such as lignocellulose, that is, substances containing cellulose and lignin (Latin (lat.): Lignum = wood (Holz)) such as wood, straw, hay but can also be Paper, an important component in the process chain for the production of syngas. Background technique [0002] The effect of fast pyrolysis is to convert carbonaceous raw materials such as biomass into a large number of liquid pyrolysis condensates (pyrolysis oil) and small amounts of solid pyrolysis coke and pyrolysis gas. Rapid pyrolysis is carried out at about 400 to 600° C., preferably about 500° C., within a few seconds, preferably about one second, and in the absence of oxygen in the aforementioned biological material as a raw material, during which the bio-oil is generally regulated. The content is 40 to 80% by weight and the amount of biocoke i...

Claims

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Application Information

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IPC IPC(8): C10B49/20C10B53/02C10C5/00
CPCC10B49/16C10C5/00C10B49/20Y02E50/14C10B53/02Y02P20/129Y02E50/10
Inventor E·亨德里克F·韦里克E·丁朱斯
Owner KARLSRUHE FORSCHZENT
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