improved method and device for reducing the sulphur content of the spent reducing gas in the circulation in a technology of direct reduction

摘要

The invention relates to an improved method and apparatus for forming metallized iron by direct reduction of particulate iron oxide. The spent reduction gas is recycled from the reduction furnace (10) through a cooler- scrubber (34) and a catalytic gas reformer (38). In the cooler scrubber (34), the spent reducing gas interacts with scrub water. Dust having an affinity for sulfur is recovered from the process and added to the scrub water causing sulfur in the spent reducing gas to form solids which precipitate out and are removed as solid waste. Lowering the sulfur content of the spent reducing gas reduces the sulfur contamination of the catalyst and improves the efficiency of the process. IMAGE