Carbonizing cellulose fibers, comprises introducing cellulose fibers in inert gas atmosphere, pre-heating cellulose fibers and drying, treating dried cellulose fibers to temperature, at which they carbonize, and cooling cellulose fibers

摘要

Carbonizing cellulose fibers, comprises (a) introducing the cellulose fibers in an inert gas atmosphere, (b) pre-heating the cellulose fibers and drying, (c) treating the dried cellulose fibers to a temperature, at which they carbonize under evolution of pyrolysis gas, (d) cooling the carbonized cellulose fibers, (e) obtaining the heat required for carrying out the steps (b) and/or (c) by burning a fuel gas, where the pyrolysis gas obtained in step (c) is used as combustion gas. An independent claim is also included for a plant for carbonizing the cellulose fibers, comprising (i) a furnace (2), whose inner chamber is filled with an inert gas, exhibiting (ia) a preheating section, in which the cellulose fibers are introduced into the inert gas atmosphere, and dried by heating, (ib) a carbonization section (10), in which the cellulose fibers are treated to a temperature, at which the carbonization takes place under the evolution of pyrolysis gas, (ic) a cooling section, in which the carbonized cellulose fibers are cooled to a temperature, at which self-ignition is prevented, and (id) a conveyor system, with which the cellulose fibers are passed through the preheating section, carbonization section and the cooling section, (ii) a heating device (16), which is fired with combustion gas, and provides the heat required in the preheating section and/or in the carbonization section, where the carbonization section of the furnace is connected with a combustion gas supply of the heating device such that the evolving pyrolysis gas can be used as combustion gas.