Shape of the Briquetting Press Tool as an Important Parameter during Solid Biofuels Production

The aim of the present paper is to present an analysis of the shape of a briquetting press tool on parameters in the pressing chamber that directly influence the resulting quality of solid biofuels. In nowadays the pressing tools and densification machines producers are step by step improving the theory of structural parameters effect. But each is dealing only with the individual situation regarding the producing tools. Meaning of this study is to present the general view on this important issue. Theoretical analysis points out the importance of dimensioning parameters of the pressing tools during briquetting and hence the necessity to consider in the engineering the direct influence of the tools shape and dimension design on the quality of solid biofuels. Authors would like to present the importance of volume-surface ratio which influence the tool wearing and production process. According to the knowledge from practice the effect of pressing chamber comicalness and effect of pressing chamber shape is calculated with using the volume-surface ratio. These calculations were applied on various shaped chambers and also original author´s design of pressing chambers were compared with usually used shapes of briquetting chambers.