METHOD AND INSTALLATION FOR PREPARING ACTIVATED CARBON FROM WOOD SAWDUST AND FINE CHIPS Russian patent published in 1998 - IPC

FIELD: sorbents. SUBSTANCE: activated carbon is prepared by drying initial material followed by pyrolysis and cooling of product. Process is carried out in a single column separated into chambers. When being dried, material is loosened and divided into small volumes. As drying agent, pyrolysis gas is used which is then serves as cooling agent to cool carbon, after which it is returned into the hearth, volume of drying chamber exceeding summary volume of pyrolysis and cooling chambers. Installation comprises hearth, fan, upright pyrolysis column used for drying material with any moisture content, pyrolysis, and cooling carbon with smoke fumes evolving upon burning released pyrolysis gas. To prevent agglomeration of material, formation of arches, and to ensure stable quality of material, the latter is loosened and displaced in equal volumes downward from feed hopper via drying, pyrolysis, cooling, and transfer chambers toward accumulator by means of rippers attached to rotary shaft, and series of disks separating the column into chambers. The disks have segment openings to pass material from one chamber into another. There are stationary volume segments inside the casing in which material is subjected to treatment with heat agent in-series in each chamber. Material pyrolysis time is determined by rotation speed of vertical shaft, and material drying time by completeness of filling of drying chamber with material under treatment. The latter value is controlled by means of corresponding small door in the column casing. To prevent overflows and gas heat carrier losses, segment wells on disks are shifted in respect to each other, a great part of surface near segment wells is not perforated, and separating disks are not perforated at all. EFFECT: enhanced efficiency of process. 2 cl, 4 dwg