Increasing energy efficiency and substitution rates in the clinker burning process by drying and grinding alternative fuels

Increasing energy efficiency and substitution rates in the clinker burning process by drying and grinding alternative fuels

When producing cement, a considerable amount of the thermal energy is required for burning the cement clinker in rotary kilns. Today, alternative fuels are being used alongside fossil fuels as a substitute for the latter. Cement manufacturers are striving to increase the proportion of alternative fuels in order to stabilise and improve their competition situation.

However, increasing use of alternative fuels means that the fuels must be of uniform quality; for example, the moisture content and particle size may only vary within certain limits.

This research project aims to first investigate the extent to which relatively inhomogeneous alternative fuels can be added into the kiln unprocessed, and how this affects kiln operation. The focus will then be on studying the extent to which it is technically and financially logical to render these fuels usable by means of external drying, comminution and homogenization in the cement works. The benefit of the respective drying and grinding systems needs to be determined and then compared with the expense and effort involved. There are plans to conduct operational trials in cement works and compile a cost-effectiveness study. Recommended action plans will then be developed for operators in order to make investment decisions easier and save capital and operating costs.

Supported by

The IGF project 18589 N of VDZ gGmbH is supported by the AiF within the framework of Industrial Collective Research (IGF) of the Federal Ministry of Economic Affairs and Energy on the basis of a decision of the German Bundestag.