High-efficiency filtration
Candle filtration with monitored precoating of the filtering area
Filtration is one of the key processes in brewery operations. Technological requirements include the need for a bright, shiny filtrate with optimum turbidity and improved physical stability of the beer. This achieves high microbiological safety for the filled product.
Yet the obvious goal is also to achieve high efficiency – perhaps through a lower consumption of filter aids, water and cleaning media. In addition, beer losses during type change-over are to be minimised while simultaneously maintaining flexibility in the choice of filter aids. The system can also be used as PVPP filter for stabilising beer.
At a glance
- Optimum distribution of different filter aids along the complete filter candle with the bypass system
- Long filter service lives with a simultaneously lower filter-aid consumption
- Reduced beer losses thanks to a short mixing phase during displacement after precoating
Process basics of the Twin Flow principle
- Register piping replaces the head plate required in conventional filter systems. The entire vessel is used as a non-filtrate area.
- The bypass allows a homogeneous flow to be controlled within the tank.
- A wide range of filter aids can be optimally precoated by varying the bypass flow.
- The filter aid is distributed evenly over the entire length of the candle. This is important because consistently good filtration is only possible with optimum distribution of the filter aid.
- For kieselguhr, a bypass flow at 12% of the nominal filter performance is recommended.
- The non-filtrate flows in the filter at 112%.
- The bypass flow is adjusted to suit the filter aid being used.
Conventional candle filter and Twin Flow principle compared
Conventional candle filter
- The overflow speed slows down along the length of the candle, from the bottom upwards.
- There is practically no flow at all in the top candle area.
- There is no even distribution over the filter aid.
Twin Flow system
- The overflow speed is increased via the bypass.
- Depending on the filter aid used, its own settling rate must be counterbalanced. This allows even precoating to be controlled along the entire length of the candle.
- By adjusting the bypass flow, the filtrate flow can be slowed down to 10% of the nominal filter performance.
Your benefits in figures
With the use of TFS filtration concept:
- The reduction in differential pressure increase by 10 percent on average enables a longer filter service life and thus enables savings of between 10 and 30 filtrations per year.
- Allows the volume of backflushing water to kieselguhr removal to be reduced by up to 30 percent.
- The number of CIP cleaning sequences is reduced thanks to the longer filter service life. An approximately 20 percent saving can be achieved here.
Your benefits
High efficiency
The register concept enables an optimum distribution of different filter aids along the entire filter candle.
Low losses and high quality
The very short mixing phase during displacement after precoating reduces the beer losses. In addition, the variably adjustable filtration output achieves an optimum quality in special beers.
Gentle care of resources included
The concept is distinguished by its 25 percent lower consumption of filter aids for precoating and continuous dosing. The TFS also stands out thanks to its water and cleaning-media savings achieved through reductions in the filtration processes.
Retrofitting
A retrofitting kit is available for existing filtration systems: The register is integrated as an intermediate flange in the existing filter housing.
