Operating experience with an Eberhardt G 135 lime shaft kiln fired with natural gas
Summary: Long-unused know-how relating to gas- and oil-operated lime shaft kilns was called on to satisfy market requirements. It has then been developed to its current level by applying authoritative expertise in the areas of refractory technology, plant engineering and process engineering. A description is given of a lime shaft kiln that not only fulfils the specific requirements of the sugar industry with respect to kiln technology, burnt lime and kiln exhaust gas but also indicates possible employment in the lime and building materials industry where existing kilns with mixed firing systems are having to be converted to different fuels.
Their comparatively robust technology combined with high efficiency means that coke-fired lime shaft kilns are used widely throughout the world, including in the soda and sugar industries. This is because not only the product, namely lime, but also the exhaust gas with its highly enriched carbon dioxide content is needed for the downstream process. When soda is produced by the Solvay process the NaCl solution containing ammonia is first carbonated and then the ammonia is recovered from the NH4Cl solution using CaO. In the sugar process the raw juice is first treated with...