摘要：Steam gasification seems a promising technology of waste
transformation since the steam is the only oxidizing reagent in the process
and gaseous carrier of volatiles. Gasses are equilibrated at high temperature
for conversion to the H2-rich syngas. After this step, the excess of steam
condenses during cooling, together with non-converted tars, oils and fine
particles. Condensing steam efficiently absorbs hydrogen bromide and
hydrogen chloride. The use of steam eliminates carbonaceous residue from
the solid mineral/metal product, which is convenient for further processing
(for example extraction of metals). The syngas and the solid residue are
generally the only products of gasification, because aqueous condensate
may be returned to the process together with non-volatile hydrocarbons
and sediments. The process was illustrated by laboratory scale gasification
experiments with a) carton packaging, b) abrasive disc, c) pork bones, d)
Cu multiwire cable e) PC/AT card and f) inverter (PCB board). The
mineral/metal products of gasification may be considered as a raw
materials for further processing, including typical routes of metals
recovery. There is no direct emission to the atmosphere from the process.
However, providing the energy from the syngas back to the reactor as well
as the energy balance of steam condensation and recirculation of
condensate to the reactor need careful analysis.
其他摘要：Steam gasification seems a promising technology of waste transformation since the steam is the only oxidizing reagent in the process and gaseous carrier of volatiles. Gasses are equilibrated at high temperature for conversion to the H2-rich syngas. After this step, the excess of steam condenses during cooling, together with non-converted tars, oils and fine particles. Condensing steam efficiently absorbs hydrogen bromide and hydrogen chloride. The use of steam eliminates carbonaceous residue from the solid mineral/metal product, which is convenient for further processing (for example extraction of metals). The syngas and the solid residue are generally the only products of gasification, because aqueous condensate may be returned to the process together with non-volatile hydrocarbons and sediments. The process was illustrated by laboratory scale gasification experiments with a) carton packaging, b) abrasive disc, c) pork bones, d) Cu multiwire cable e) PC/AT card and f) inverter (PCB board). The mineral/metal products of gasification may be considered as a raw materials for further processing, including typical routes of metals recovery. There is no direct emission to the atmosphere from the process. However, providing the energy from the syngas back to the reactor as well as the energy balance of steam condensation and recirculation of condensate to the reactor need careful analysis.
