steinecker Stromboli wort boiling system Perfect in every brewing process

Transcription

1 wort boiling system Perfect in every brewing process

2 Perfect for wort quality and saving resources Wort boiling is a fundamental step in the production of premium-quality beer. A stable head on the beer and constant wort quality are your requirements besides an excellent overall quality. The technical requirements on the processes can be met with precision thanks to the perfect matching of the pre-heating and boiling phases in the steinecker wort boiling systems. The stripping of unwanted flavourings, the coagulation of albumen as well as non-activation of the enzymes are just a few keywords for the complex reactions of the boiling process. Temperature layers can be prevented by targeted wort swirling and a high wort quality is ensured in this way as well. Low temperatures from the means used for heating prevent any thermal stressing of the wort. Energy saving is an important aspect in this energy-intensive procedural step in the brewhouse. The steinecker wort boiling systems themselves already allow for reduction of the energy used in combination with energy recovery systems, you can here open up considerable resource saving potentials. steinecker boiling systems provide the perfect technology for every brewery: Internal boiler system Stromboli External boiler system Stromboli

3 Method of operation The main element of the Stromboli system is the Venturi nozzle above the pipe bundle heat exchanger. The wort supplied by a pump from the bottom through the central ascending pipe results in a vacuum at the outside of the Venturi nozzle which supports the wort flow in the pipe bundle. This provides for homogeneous treatment and even mixture of the kettle volume. The circulation pump allows for an intensified wort flow in the boiler pipes so that the heat transfer at the heating surface is increased. This allows for reduced temperatures from the means used for heating and thus for reduced thermal stressing of the wort. Boiling process Stromboli inspection level Stromboli machine level In the Stromboli, two circulation circuits of the wort are combined: the natural circulation of the boiler and the pump circulation through the central ascending pipe. The boiling process comprises three phases allowing for reduced total evaporation of 3 to 4 percent: Phase 1 Natural circulation due to energy supply and pump circulation Phase 2 Pump circulation with reduced energy supply Circulation of the wort by means of the external pump and the Venturi nozzle to reduce the free DMS content with reduced energy use Phase 3 Natural circulation due to energy supply and pump circulation

4 Internal boiler system Method of operation The wort in the kettle is uniformly taken off over the lines in the base of the kettle. The frequency-controlled pump feeds the wort through the ascending pipe to the jet pump. The suction effect created in this area causes continuous flowing through the heating pipes of the tube-bundle heat exchanger. Any undesired pulsating, which is one of the main causes of fouling, is thus prevented in every phase. Stromboli CC-de34-p /09 MS Cross-sectional view Circulation circuits View of the interior

5 External boiler system Method of operation The wort cycle between the kettle and the external boiler is supplemented by a jet pump with downstream wort spreader in the wort kettle. Wort-mixing in the kettle is better because of the jet pump, and the wort spreader ensures there is a large area available for the evaporation process. The large heating area of the external boiler allows for very small temperature differences between the heat area and the wort and this in turn means lower temperatures are needed for the heating process. Besides being able to use the external boiler system for different brew sizes, two wort kettles can be fed from one external boiler. Cross-sectional view Example of a pipe system View of the interior

6 Technical values Acceptance data for a Stromboli internal boiler system The average values for acceptance of a Stromboli with three brews give the following picture: The values for the Δ TBI of 11.1 units with a boiling duration of 65 min confirm the gentle nature of the boiling process. Good conventional boiling systems, where only light malt is used and the boiling time is minutes, lie at around units when boiling starts, and in the cast wort at a TBI of The guiding value in the DIN for this is < 45. Kettle full wort (start of boiling) Parameters Unit Average value Guiding value MEBAK Original wort % in wt Colour EBC 4.8 Coag. N mg/l 38 TBI 19.1 DMS-free μg/l 134 Cast wort (end of boiling) Parameters Unit Average value Guiding value MEBAK Original wort % in wt Colour EBC 5.1 Coag. N mg/l TBI 30.2 < 45 TBI 11.1 DMS-free μg/l 13.3 kw/hl 6,0 5,0 4,0 3,0 2,0 1,0 0,0 0 Pre-heat Boil phase 1 Boiling break Temperature in C Pump speed in % Boil phase 2 120, kw/hl Pump in % Wort temperature in C Time in min Example of a Stromboli boiling programme 100,0 80,0 60,0 40,0 20,0 0,0 Wort at mid of cooling Parameters Unit Average value Guiding value MEBAK Original wort % in wt Colour EBC 7.2 TBI 36.8 < 60 DMS-free μg/l 65 < 100 Analysis results (Average value from three brews)

7 Energy-recovery systems Saving valuable energy throughout the process Vapour condenser Energy recovery is a further module of the steinecker wort boiling systems and in these times of increasing energy prices and climate change, this is being focused on more and more. Gentle pre-heating phases and a reduction of the overall evaporation contribute to the economic efficiency and to saving resources. The evaporation from the first to the last brew of the production week can be exactly determined by the integrated energy measurements made and in this way, balanced energy use can be achieved. In this way, energy storage systems can be used more reasonably. The following systems are recommended as ideal supplements to the steinecker wort boiling systems: The energy from the vapour from wort boiling recovered by the vapour condenser makes it possible in an additional lautering wort heater to increase the temperature of the wort in a gentle yet swift manner and almost to the level required for boiling. Thus boiling in the wort kettle is reached quickly and this makes a further contribution to saving resources in the brewing process. The values given above for the overall evaporation mean that a balanced energy and hot-water budget in the brewhouse can be realised. Thermal vapour compression Here the vapours are sucked in by a vapour jet compressor, compressed and fed to the boiling system. Live steam at a pressure of more than 8 bar is used here as the propellant. Buffer 96 C 74 C 96 C Energy storage 78 C Lauter wort heater 78 C 92 C Stromboli IK Cold water 15 C For production Condensate cooler 30 C Y 99 C 80 C Cold water Cooling system Chilled water Warm water cooler 3 C Ice water 80 C 3 C Vapour condenser Whirlpool Wort cooler 3 C 80 C Cold wort for the fermentation 99 C cellar Stromboli internal boiler system as an example for an energy recovery system

8 Your benefits Gentle pre-heating of the wort Uniformity in pre-heating can be realised by using a frequency controlled wort pump. Any pulsation associated with the internal boiler system is effectively avoided in this way. High wort quality An optimum evaporation area is created thanks to the adjustable width of the slit in the wort spreader. Together with the higher rate for turning over the contents of the kettle by using the circulation pump and the jet pump, a lower overall evaporation is realised here. Longer running times between the cleaning intervals The circulation system prevents any overheating and pulsating of the wort in the internal boiler system, and this reduces fouling. Less energy needed The reduction of 3 4 % in the total evaporation means that less primary energy is consumed. Furthermore, the burden from spent gases, the amounts of fresh and waste water as well as the cleaning agents required are all reduced. Exactly set heat supply Specific control of the heat supplied in the boiling phases makes it possible to control the various wort parameters. This is realised with the internal boiler system by integrated energy measurements. With the external boiler system, the difference between the boiler incoming and outgoing temperatures is regulated or energy measurements are made. Suitable for retrofitting Almost every internal or external boiler can be retrofitted to work according to the Stromboli principle. The offers of the Krones Lifecycle Service support high efficiency of the wort boiler on a permanent basis. Integration into the process control For automatic processes in the brewery, the Botec F1 process control system is available into which the Stromboli can be integrated. Via connection to the Krones remote maintenance, the system technology or process engineering tasks can be monitored on demand.

9 Subject to technical changes The illustrations can contain optional auxiliary equipment PDF_en 10/12 IT solutions The SitePilot modular system includes IT solutions which we developed especially for the beverage and food industry. Whether you want to increase the utilisation of your line capacity, monitor product quality, or make spare parts handling more efficient: With SitePilot, you will always get the best result. enviro Lifecycle Service Your company is unique why be satisfied with conventional solutions? The krones Lifecycle Service will support you and your production also after the purchase of new machines. These are services which are individually tailor-made to suit your products and location. krones Academy krones Service Line You need support with a technical problem? Or you have an urgent question about you line? No problem: We are just a call away from you. Dial to get quick and straightforward assistance in several languages around the clock! High-performance technology with low consumption of resources offering safety for humans and the environment this is all guaranteed by the enviro sign. TÜV SÜD (technical control board) as an impartial assessor has confirmed, that the enviro method leads to energy- and mediaefficient and environment-compatible machines and lines. Make your colleagues high performers: The training of krones Academy provides first-hand trade information proven in field. You will find the suitable know-how package for almost any field and hierachy level ranging from technical courses to management training. krones ag Böhmerwaldstraße Neutraubling Germany Phone Fax info@krones.com Internet