Production of charcoal from sawdust in a fluidized bed专利检索-木质颗粒生物质可再生能源燃料种类专利检索查询-专利查询网

Production of charcoal from sawdust in a fluidized bed

阅读：248发布：2023-06-29

专利汇可以提供Production of charcoal from sawdust in a fluidized bed专利检索，专利查询，专利分析的服务。并且A method for disposing of wood refuse and recovering valuable wood by-products without polluting the ennvironment by mixing the wood refuse with inert granulated bed material to form a fluidizable mixture which is heated in a fluidized bed pyrolyzer until charcoal and other by-products are formed. Upon discharge of the charcoal and bed material from the pyrolyzer, they are separated and the inert material is mixed with additional wood refuse and recirculated through the pyrolyzer while the charcoal is cooled in an oxygen-free atmosphere. The other wood byproducts are carried from the pyrolyzer with the off-gas, from which they are separated and recovered for further processing, leaving only the purified off-gas to be vented to the environment. The method is also useful for producing activated charcoal by treating the charcoal and bed material mixture in a second fluidized bed to activate the charcoal before discharge to the separator and charcoal cooler. Also disclosed is a fluidized bed containment vessel having a baffled interstructure to eliminate back mixing of the wood refuse with the charcoal already formed in the bed.，下面是Production of charcoal from sawdust in a fluidized bed专利的具体信息内容。

权利要求

1. A METHOD OF DISPOSING OF WOOD REFUSE WHILE SIMULTANEOUSLY RECOVERING CHARCOAL AND WOOD BY-PRODUCTS WITHOUT POLLUTING THE ENVIRONMENT COMPRISING: MIXING THE WOOD REFUSE SELECTED FROM THE GROUP CONSISTING OF SAWDUS, WOOD CHIPS AND TREE BARK WITH ABOUT 40-60% BY VOLUME OF AN INERT GRANULAR BED MATERIAL WHICH IS FROM ABOUT - 14 TO 100 MESH IN SIZE SELECTED FROM THE GROUP CONSISTING OF SAND AND ALUMINA TO FORM A FEED MIXTURE; PASSING THE FEED MIXTURE INTO A FLUIDIZED BED CONTAINMENT VESSEL; FLUIDIZING SAID MIXTURE WTH AN OXYGEN-FREE GAS, THEREBY FORMING A FLUIDIZED BED; HEATING SAID FLUIDIIZED BED TO 280* TO 1000*F TO PYROLYZE THE WOOD REFUSE; MAINTAINING THE WOOD REFUSE IN THE BED UNTIL PYROLYZATION OF THE REFUSE TO CHARCOAL AND GASEOUS WOOD BY-PRODUCTS IS COMPLETE, THE CHARCOAL REMAINING WITH THE BED MATERIAL AND THE GASEOUS BY-PRODUCT BEING CARIED FROM THE BED WITH THE FLUIDIZING OFF-GAS; REMOVING THE CHARCOAL AND BED MATERIAL FROM THE VESSEL; SEPARATING THE CHARCOAL FROM THE BED MATERIAL; COOLING THE CHARCOAT IN AN OXYGEN-FREE ATMOSPHERE WHILE RECICULATING THEE INERT BED MATERIAL TO BE MIXED WITH ADDITIONAL WOOD REFUSE; SEPARATING THE GASEOUS BY-PRODUCTS FROM THE FLUIDIZED BED OFF-GAS; RECOVERING THE BY-PRODUCTS AND VENTING THE PURIFIED OFF-GAS TO THE ATMOSPHERE.

2. The method of claim 1 wherein the fluidizing gas is selected from the group consisting of CO2 and nitrogen.

3. A process for making activated charcoal from wood refuse in a fluidized bed comprising: mixing the wood refuse selected from the group consisting of sawdust, wood chips and tree bark with about 40-60% by volume of an inert granular bed material which is from about -14 to 100 mesh in size selected from the group consisting of sand and alumina to form a feed mixture; passing the feed mixture into a fluidized bed containment vessel; fluidizing the mixture with an oxygen-free gas, thereby forming a fluidized bed; heating the bed to 280* to 1000*F to pyrolyze the wood refuse; maintaining the wood refuse in the bed until pyrolyzation of the refuse to charcoal and gaseous wood by-products is complete, the charcoal remaining with the inert granular material and the gaseous by-products being carried from the bed with the fluidizing off-gas; removing the charcoal and granular mixture from the vessel into a second fluidized bed containment vessel; fluidizing the mixture with a gas selected from the group consisting of steam and CO2, thereby forming a fluidized bed; heating said second bed to a temperature of from 1400* to 1800*F for a period of time sufficient to activate the charcoal; removing the activated charcoal and bed material mixture from the fluidized bed; separating the activated charcoal from the bed material and cooling the charcoal in an oxygen-free atmosphere.

4. The method of claim 3 wherein the oxygen-free fluidizing gas is selected from the group consisting of CO2 and nitrogen.

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Production of charcoal from sawdust in a fluidized bed

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