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CO2-Abatement Costs of Alternative Fuels in the Cement Industry

As a result of the high share of energy related costs on the one hand and the direct relationship between the energy carrier used and the CO2-emissions (among others) emitted the Austrian cement industry focuses on optimizing its energy supply. Respective recent R & D addresses the increase of the substitution rate of conventional fossil fuel by using (partly) biogenic fuels - such as reed, sewage sludge as well as solid recovered fuel with elevated contents of biogenic carbon. The possibility to apply these types of fuels largely depends on the process technology in place. Specific peculiarities of cement plants (raw material, process technology, product specifications) can easily result in the non-ability of applying specific alternative fuels.

Before the full implementation of the use of new fuels one must not only proof the technological feasibility of the use of a specific fuel but one must also evaluate the economical implications from a holistic point of view. Due to a very dynamic market environment and continu-ously developing regulations one also needs to look at the changes of the economical implications caused by changing market conditions with respect to for example fuel prices as well as CO2-costs in order to allow for the right decision from the company´s perspective (=> sensitivity analyses).
This conference contribution analyses the results of the economic evaluation (CO2-abatement costs) of the utilization of following alternative fuels of predominantly biogenic nature:
ï‚· Reed (Scenario A),
ï‚· Solid Recovered Fuel with elevated content of biogenic carbon (Scenario B),
ï‚· (Dried) Sewage Sludge (Scenario C),
compared to a solely fossil based energy supply (PetCoke, => Reference Scenario) as well as the current fuel supply (Fluff, => Standard Scenario) exemplarily on the example of a cement plant that currently mainly uses Fluff for its fuel supply. Respective process technology required for alternative fuel utilization therefore is already in place. The analysis shows that based on the specific case looked at and under current market conditions three of the four fuel supply scenarios already result in negative CO2-abatement costs compared to the reference scenario. Based on projected rising fuel prices and rising CO2-costs it can be assumed that all fuel supply scenarios looked it will become even more economically advantageous in the future.

Copyright:	© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle:	Depotech 2012 (November 2012)
Seiten:	6
Preis:	€ 3,00
Autor:	DI Dr. Arne Michael Ragossnig R. Plank
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