Influence of the refractory lining on
the cost efficiency of clinker production
P. Groger, H.-J. Klischat, S. Puntke, Refratechnik Cement GmbH, Goettingen, Germany
The sales of cement, lime, steel and aluminium continue to provide an indication of the wealth of society. Together with some other industries their production stands at the start of the value-added chain and, as energy-intensive industries, they are always trying to reduce the use of energy without compromising the properties and quality of the products. The characteristics variables here are essentially the CO2 emissions, the carbon footprint and the energy efficiency. Numerous process engineering measures have been taken in the past to lower the energy usage. Moving the calcination of the limestone to the preheater, the use of a pre-calciner or the use of alternative, biogenic, raw materials and fuels can be mentioned here as examples. Efficiencies were achieved that are exemplary for thermal processes. Refractory products, which are located further along the value-added chain, are indispensable for the production of cement and lime. The installation of thermally insulating refractory bricks in rotary kilns and the backing of brickwork with insulating materials have therefore also been known for a long time. However, new developments offer further potential for lowering the use of energy and increasing the energy efficiency still further. Processes are coming increasingly to the fore that were formerly not considered because their energy-saving potential seemed low but will have to be taken into account in the future. This includes, for example, the heating procedure after a kiln stoppage. The examples of new developments in refractory technology that are described in this article are representative of the intensive interchange between customers and refractory developers and underline the potential for innovation.
Summary CEMENT INTERNATIONAL 03/2017 pp 66-73
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