| 摘要 |
To produce cement clinker and SO2-rich exit gases from starting materials containing calcium sulphate, the SO2 is eliminated from the calcium sulphate in a circulation system consisting of a fluidised-bed reactor, a precipitator and a return line, while a separate burning furnace is used for burning the cement clinker. This makes it possible to keep the exit gas streams separate and, on the one hand, to obtain an exit gas with about 20% of SO2 for sulphuric acid manufacture from the circulation system and, on the other hand, to obtain from the burning furnace an essentially SO2-free exit gas which can be used in the conventional manner for drying and preheating the raw materials. In conjunction with further heat recovery measures, this provides an economical process for producing sulphuric acid and cement clinker from starting materials containing calcium sulphate, which process is important in particular in view of the fact that flue gas desulphurisation plant products are arising in increasing amounts. |
