| 摘要 |
It is known to produce biochar from wood by the use of ring kilns and the like. However, they are inefficient and release ‘greenhouse gases’ to the atmosphere. The present invention provides a method of producing biochar from woody biomass comprising the steps of (a) placing feedstock (60) in a first kiln (10); (b) burning fuel in an oxidiser (70) and directing the resultant heated gases from the oxidiser to the feedstock to reduce the moisture content of the feedstock; (c) burning fuel in an oxidiser and directing the resultant heated gases from the oxidiser to the feedstock to pyrolyse the feedstock; (d) removing at least some of the pyrolytic gases, released from the feedstock in step c, to the oxidiser for burning therein; (e) directing at least a portion of the at least partially inert gases resultant from the burning of the pyrolytic gases in step d to the feedstock to regulate the amount of heat and air supplied to the kiln to controllably continue pyrolysis of the feedstock therein. |
