knowledge, wort post-processing technology

Beer equipment knowledge point
05/10/2019
05/27/2019
  • The purpose of post-treatment of wort

After the wort is boiled, the hot coagulum and the cold coagulum in the wort should be effectively separated as soon as possible to obtain a clear wort. The wort is then cooled to the fermentation temperature required by the process (the fermentation should be cooled to 6 to 9 ° C and the top fermentation to 12 to 18 ° C). While cooling, the wort is ventilated to provide sufficient oxygen for yeast propagation.

 The main tasks of wort post-treatment are: separation of hops and hot coagulum; wort cooling; wort ventilation (yeast oxygen supply); yeast addition; cold coagulum separation; yeast reproduction;

  • Convolution sedimentation tank


It is the most commonly used thermal coagulating separation device and has the best separation effect compared to other separation devices. The swirling sedimentation tank is a vertical cylindrical tank, and the wort is pumped in a tangential direction to form a swirling flow and the hot coagulum settles in the center of the bottom of the tank in a conical shape, and the clear wort is discharged from the side wort outlet.

  • Structure of the cyclone sedimentation tank

NLTU
1-exhaust

2-wash water inlet

3-a water spray ring and nozzle!

4-liquid level indicator tube

5-wort tangential import

6-manhole

7-water protection ring for reinforced concrete base

8-base

9-wort and waste water discharge valve

  • Coriolis effect

The rotation of the wort should take advantage of the Coriolis inertial force produced by the Earth’s rotation from west to east. Therefore, the correct direction of rotation in the northern hemisphere should be counterclockwise, otherwise it will waste energy as slow as the boat. Of course, the southern hemisphere should be the opposite, but should be rotated clockwise.

  • Separation of the hot coagulum in the wort
  • Important process factors in wort post-treatment

Heating time: The heating time is short, and the total time should be <60 minutes. Hot wort delivery: The delivery should be smooth and gentle. Prevents and prevents air from entering and forming bubbles; the hot coagulum is not destroyed when flowing in the pumping and piping.

Pumping of hot wort: The height/diameter ratio of the swirling sedimentation tank should be correct (H/D=1/2~3). According to the nature of the hot coagulum, the swirling sedimentation tank should have multiple openings, and also ensure the wheat The juice pump has no cavitation.

Thermal energy recovery rate of plate heat exchanger: The heat recovery rate of plate heat exchanger should be >95%, and the temperature difference between the front and rear cooling zones should be small. The hot water temperature is raised as much as possible and can be directly used to filter the washing waste after storage in the hot water storage tank.

  • Technical requirements for cyclone sedimentation tank

      ● The technical targets of the cyclone sedimentation tank are: wort turbidity < 10EBC, wort solid particles <25mg/L; the thermal coagulum is completely separated, maintaining a good coagulum.

       ●The inner wall of the swirling sedimentation tank has no edges and edges, and the edges should be smooth and clean.

● There is no secondary flow phenomenon in the swirling sedimentation tank; the annular eddy current is as small as possible.

       ● The import speed of wort is moderate, and the flow rate of high/diameter ratio (H/D) and wort should be moderate. The flat-bottomed swirling sedimentation tank should have an inclination of 1 to 2%, and the wort outlet hole should be provided at the bottom edge of the groove.

       ● To accurately balance the relationship between wort bleed rate and pumping speed.