VDZ Congress 2013 Process Technology of Cement Manufacturing by Verein Deutscher Zementwerke

Author:Verein Deutscher Zementwerke
Language: deu
Format: epub
Publisher: Verlag Bau+Technik GmbH
Published: 2013-11-15T00:00:00+00:00

The different impacts described above lead to a slight increase of the power demand to 110.8 kWh/t cement (399 MJ/t). The additional increase of alternative fuel utilization from 61 to 80 % compensates partly the gain in thermal energy demand (2532 MJ/t in 2030).

The implementation of additional environmental requirements as described above leads to an increase of power demand to 114.8 kWh/t cement (413 MJ/t).

Summarized these modelling results show, that the reduction of clinker cement ratio represents the strongest effect on the total energy demand of cement manufacture. With respect to thermal energy demand, the use of alternative fuels is important.

On the other hand it has to be considered, that the process integrated drying of these fuels is included in the calculation whereas the drying of the replaced fuel (in Germany mainly lignite) is excluded. Power demand as well as the different parameters which influence it are of minor significance.

5 Potentials and outlook

Figure 8 summarises the results of the modelling of the different scenarios as well as the maximum BAT scenarios. The figure shows that under “business as usual”-conditions and the basic assumptions for the product portfolio, the total energy demand of cement manufacture in Germany may decrease by a maximum of ca. 7 %. Almost no reduction can be expected, if slag is available in significantly lower quantities (scenario 2). Taking the maximum achievable potentials for clinker burning and cement grinding into account, a maximum reduction of 12 % (thermal potential) or 14 % respectively (total potential) results. This maximum case is based on scenario 1 for the product portfolio as well as the considered total replacement of kilns by BAT kilns and cement mills by VRM or equivalent technology in the German cement plants. The small remaining potentials identified for reducing energy demand of the cement production confirm the high level of energy efficiency the cement industry has already achieved today.

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