| 摘要 |
<p>The method for recycling conditioned wood products is characterised in that the conditioned wood products are broken up into wood chips to be introduced in a column reactor (3) of substantial height with a lower combustion portion and an upper cooling portion. In the lower reactor portion, the chips are subjected to an adiabatic combustion process caused by hot, oxygen poor gases at a temperature of 400 °C, wherein the mass of chips above the combustion portion accumulates the excess heat carried by the gases, causing the gradual cooling thereof until they reach a temperature not exceeding 65 °C, forming an inverse temperature gradient, and causing a condensation which, when it contacts the chips, deposits thereon particles such as metal particles, tar and vapour, contained in the gases; the non-compressible flue gases, freed from any heavy metals, being thereafter discharged from the reactor. The oxygen content of the flue gases introduced in the lower reactor portion is very low so as to avoid ignition of the chips and to enhance the reducing effect, and the charcoal resulting from the chip combustion includes the heavy metals and other pollutants from the reduction process for recycling in other processing applications. An installation for implementing the process is also described.</p> |
