Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Improve the combustion of leather wastes and the co-combustion of coal and biomass wastes in fluidised bed using a new dry gas cleaning system

Leather waste is easier to ignite and to burn than coal due to the high volatile matter and the combustion is expected to be fast and difficult to control. Besides, the fuel has unusually high nitrogen content (14.1% d.b.) because of its origin. Also the presence of sulphur (2%) is important. Finally, The presence of chromium makes it necessary to study the combustion conditions to prevent Cr(VI) formation.

As it is well know, fluidised bed technology permits the use a sorbent for the reduction of SO2 emissions, however in the case of leather wastes when limestone is used for reducing SO2 emissions, Cr (VI) is present in the flue gas. So a post combustion technology to reduce this emission must be applied.

The application of the new combined dry cleaning systems improves the application of combustion of the leather wastes as a consequence of decreasing the NOx, SO2 emissions. Moreover the study of the combustion ash recycling, is important from the economical and environmental point of view. The ash from leather wastes has high chromium content. Thus the ability to recover this chromium is very important, since this element is not available in the EU and must be imported mainly from South Africa.

The co-firing programs carried out in the United States and Europe have demonstrated that co-firing biomass with coal can be beneficial to the utilities as well to the environment. Co-combustion technology, however, faces some technological problems. These problems are related to the alkaline content in the ashes and chlorine content. The application of the new combined dry cleaning system improves the combustion of coal/biomass mixtures as a consequence of decreasing the particulate matter and HCl emissions. Also in the framework of this project the study of the effect of ash characteristics on the SCR and filters process could be studied.

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