Scrap disposal in coke-fired shaft furnace - involves circulation of organic content gasification gas to metal content melting zone

摘要

In the disposal of assorted scrap materials, esp. ferrous and/or non-ferrous metal scrap, which is lacquered and plastics coated and/or mixed with plastics and other organic cpds,. in a coke-heated shaft furnace, the novelty is that: (i) the scrap is degassed and/or gasified in the upper shaft region; (ii) the resulting dust-laden gases are completely withdrawn as circulated gas; (iii) the circulated gas is combusted with oxygen in the melting and superheating zone; (iv) the gas then flows through the incandescent coke and charge column; and (v) excess gas exits between the circulated gas suction withdrawal opening and the melting and superheating zone. In the appts. a circulated gas suction ring (1), with suction openings (2) uniformly distributed around the shaft periphery is located at least 500 mm below the max. charge column height and is connected by a circulated gas line (3) to a circulated gas distribution ring (4). The distribution ring (4) is connected by feed lines (5) to tuyeres (6) in the lower shaft region. Excess gas nozzles (8) are installed between the melting and superheating zone (7) and the circulated gas suction openings (2) and is connected to conventional equipment such as a gas quencher (9) and gas cleaning and heat recovery units (10), forming the excess gas exhaust system (11). ADVANTAGE - The process has low equipment and operating costs and conforms with prescribed environmental pollution limits.