Process for calcining mineral rock in a vertical right furnace with regenerative parallel flows and furnace used

摘要

Process for calcining mineral rock in a vertical straight furnace with regenerative parallel flows, with at least two tanks (1,2) interconnected by a transfer path for gas (3), each tank operating alternately in cooking mode and in preheating mode, the cooking mode comprising a combustion of fuel in the presence of air so as to obtain a cooking of the rock into calcined rock, a release of combustion gases, and a passage of these from one tank to another through the 'intermediate said path (3), the preheating mode comprising an exchange of heat between said rock and said combustion gases from said path (3), this method further comprising an injection of complementary air into said path (3) with oxidation of unburnt substances contained in the combustion gases passing in this path.