| 摘要 |
<p>Thermal processing of shredded plastic articles comprises heating with nitrogen-containing additive/catalyst mixture at to 350 - 600 degrees C in two stages. The gases produced in the first stage of carbonization are used to activate the carbon produced, after which they are burnt to heat the reactors used in the two stages. Method for thermal processing of materials containing polymers and cellulose, especially shredded articles, comprises mixing shredded waste plastic with a nitrogen-containing additive/catalyst mixture in an indirectly heated main reactor (1). Mixing is carried out using a mixing screw (13) while heating to 350 - 600 degrees C, so that carbonized material and gas are produced. The carbonized material is fed to a post-treatment reactor (2) where it is treated at the same temperature with the gas produced, further degassed, activated by the hydrogen in the gases, and fed via a perforated screw to a grinder (3). Here it is ground to the desired particle size, fed to a magnetic separator (9) to remove metal and then molded into active carbon pellets in a pelletizer (11). The gases are fed to a first washer (4), which uses water, and then to a second (5) which uses a calcium-containing solution. The purified gas is heated by heat exchangers (6a, 6b) and burnt in a burner (28) and/or pressure/heat coupling device to heat the main and post-treatment reactors. An Independent claim is included for apparatus for carrying out the above process.</p> |
