Method for chemical loop combustion using pyrolusite as an oxide-reducing mass

摘要

The method comprises activating a natural manganese mineral by gradually increasing a temperature under an oxidizing atmosphere to a temperature of = 900[deg] C. The step of gradually increasing the temperature is performed at a rate of 5-100[deg] C/hours. The natural manganese mineral is activated in a chemical looping combustion installation. Particles of the natural manganese mineral are fine particle produced during the extraction and the production of metallurgical grade mineral. The natural manganese mineral is crushed and sieved to obtain an active mass with a particle size. The method comprises activating a natural manganese mineral by gradually increasing a temperature under an oxidizing atmosphere to a temperature of = 900[deg] C. The step of gradually increasing the temperature is performed at a rate of 5-100[deg] C/hours. The natural manganese mineral is activated in a chemical looping combustion installation. Particles of the natural manganese mineral are fine particles produced during the extraction and the production of metallurgical grade mineral. The natural manganese mineral is crushed and sieved to obtain an active mass with a particle size compatible with an implementation in a fluidized bed. The active mass has a particle size such that more than 95% of particles of active mass have a size of 150-300 mm. A flow rate of the active mass measured at an inlet of a chemical loop reduction zone is 30-100 kg/hour of oxygen consumed in the reduction zone. The temperature of the reduction zone is 600-1400[deg] C. The reduction reaction is performed in the presence of water vapor.