October, 2014

FlowMac 6.12 Released

The latest version of FlowMac is version 6.12.

New blocks:

– Anaerobic digester.

– Plotter I/O simplified.

– New sedimentation bassin, where it is possible to have different separation of fiber and filler/ash.

– Fenton, an example of use in Effluent Treatment

– A new Heat Exchanger for heating air with hot water.

New features in exsiting blocks:

– WW Supplier, Flow Input are blocks where it now is possible to feed time series in.

Improved Heat Utilisation Paper Machine

FlowMac was used to make detailed mass balances for fiber, water, filler and energy. The model were tuned to have the same production rate, temperature profile and consistency profile as the real process. This paper machine have a pump, piping and control strategy for heating PM white water in the TMP heat recovery system. Several studies have shown that this heat stay in the white water tower. Actual temperature measurements show that the temperature in the white water tower can be 5°C hotter than the white water fed to the main pumps out of the tower.
With the model, we simulated alternative ways to create more circulation of the white water in the white water storage tower. The simulations showed that all heat that could be fed to the main white water pumps would reduce the amount of fresh steam to the white water silo. The FlowMac simulations showed that a 350 mm pipe had to be diverted and extended 20m in order to get an annual cost savings of 300 000 EUR.

Biogas Project

FlowMac was used in a main study for a rebuild of an existing effluent treatment plan.
With FlowMac we made a complete model of all different treatment stages: preflotation, buffers, presedimentation, anaerobic treatment, aerobic treatment, secondary sedimentation, tertiary flotation, sludge handling.
It has been developed a new FlowMac block for anaerobic treatment where the user can specify COD-reduction and the COD is converted to raw biogas (methane, CO2 and H2S).
Mill data for incoming COD, suspended solids and flow data can be fed into the model to evaluate overall COD reduction, biogas production and alternative operating scenarios.