Performance of the bagasse diffuser at Invicta Sugar Mill

The BMA bagasse diffuser installed at Invicta Sugar Mill, Australia, has operated since 1995. Recently, the performance of the diffuser was assessed and optimised using measured juice percolation velocity for each stage. While percolation velocity is an important parameter in diffuser operation, other parameters and factors affect the diffuser’s performance. An improved model of the diffuser extraction process was developed, which defines the process of the diffuser in three phases. New non-dimensionless performance indicators were developed, namely the mixing, percolation, and diffusion factors. These indicators describe and quantify the different phases of the diffuser extraction process. Using the new model for the diffuser and linking the diffuser extraction model to a mill extraction model, the performance of the entire extraction station was assessed.