Method of vitrifying waste material contg. high proportion of carbon - with heat generated by burning gases used to heat up material fed to appts.

摘要

Waste material contg. high degree of carbon is vitrified in an electric melting furnace (2). The off-gases are burnt in a chamber (3) and then fed to a heater (4) where raw material is preheated. Cold air is also fed into the heater so that the air leaving the heater has a temp. of 150-400 deg.C. This air is then partially fed back to the gas leaving the chamber (3) and partially to a gas washer and cleaning device (7). ADVANTAGE - The energy of the off-gases produced after converting CO to CO2 is fully used. Only small amounts of off-gas need to be disposed of and cost of the process is low.