System and method for recycling of carbon-containing materials

摘要

There is described a system and method for recycling carbon-containing material, in particular tires and plastics materials. The system includes a heating arrangement for anaerobically heating carbon containing material to produce carbon-containing gases. A condensing arrangement is also used to condense a proportion of the carbon-containing gases to provide condensed gases and non-condensed gases. In addition, a recirculating arrangement is provided for recirculating the non-condensed gases into the heating arrangement. Further systems and methods for pre- and post-processing of the carbon-containing material are also disclosed and products of the systems and methods are also described.

主权项

1. A method for recycling carbon-containing material comprising used vehicle tyres, the method comprising:
(i) introducing, after preheating, carbon-containing material comprising shredded vehicle tyres with lateral dimensions up to about 300 mm and including metal reinforcement into an upstream end of a heating arrangement; (ii) anaerobically heating the carbon-containing material in a heating arrangement including heating means and comprising a rotary kiln having an inclined rotary drum having a longitudinal axis and upstream and downstream ends, the upstream end being higher than the downstream end, to produce by pyrolysis carbon-containing gases, solid carbon and metal fragments; (iii) discharging solid material produced as a result of heating the carbon-containing material at a discharge arrangement at the downstream end; (iv) condensing a proportion of the carbon-containing gases to provide condensed gases including at least one oil fraction and non-condensed gases; (v) recirculating, via a recirculation valve of a recirculation arrangement, the non-condensed gases into an interior of the rotary drum of the heating arrangement at an introduction point upstream of and proximate to the discharge arrangement, the introduction point being arranged along the longitudinal axis of the rotary drum, whereby during operation solids flow to the downstream end of the rotary drum to be discharged by the discharge arrangement and the non-condensed gases flow within the rotary drum upstream from the introduction point to an extraction point adjacent the upstream end and comprising causing the carbon-containing gases to preheat the carbon-containing material before its introduction into the upstream end; (vi) controlling the temperature in the heating arrangement to a temperature of greater than 400° C. and less than 800° C., including controlling an amount of non-condensed gases recirculated into the interior of the rotary drum during pyrolysis of the carbon-containing material; (vii) adjusting the recirculation valve to control the amount of non-condensed gases recirculated into the interior of the rotary drum during pyrolysis of the carbon-containing material to control pressure in the rotary drum to approximately atmospheric pressure ±7500 Pa; (viii) obtaining carbon-containing solids from the discharge arrangement; and (ix) separating metals from the carbon-containing solids.