The goal of separating the thermal coagulate by the gyratory sedimentation tank is: the turbidity of wort is 10ebc, the solid particle content of wort is less than 25mg / L, the separation of the thermal coagulate is complete, and a good solid mound can be formed. To achieve this goal, we should pay attention to the following operation points.
The hot wort is discharged from the boiling pot and pumped into the rotary sedimentation tank by centrifugal pump. The linear speed of wort entering the tank is 8 ~ 16m / s, and the wort in the tank rotates at the speed of 8 ~ 10R / min. After pumping wort, use hot water to push the wort in the pipeline into the gyratory sedimentation tank. Do not use air or steam to avoid damaging the gyratory effect.
After the hot wort pump is finished, let it stand for 20 ~ 40min to make the hot coagulate fully precipitate. At this time, the exhaust pipe windshield and manhole should be closed to minimize the contact between wort and air. In the case of good precipitation effect, the standing time should be shortened as far as possible to avoid the wort color deepening.
When discharging wort, the outlet valves should be opened from top to bottom, and the bottom outlet valve should be discharged in sections. When opening the bottom outlet valve, the flow should be controlled to prevent the wort from flowing too much in the tank Fast and impulsive sediment. When the wort level drops close to the top of the solidifying substance mound, the wort pump should be adjusted accurately to make the pump speed not higher than the speed of wort exuding from the solidifying substance mound, so as to avoid the splitting and collapse of the solidifying substance, and enter the plate heat exchanger with wort, which will affect the wort cooling and yeast fermentation.
In order to improve the separation effect of cyclotron sedimentation tank, the following measures can be taken.
In addition to the main flow of wort, there is a low velocity secondary flow in the gyratory sedimentation tank, i.e. annular vortex. Especially at the bottom of the tank, these vortices will destroy the mounds and affect the separation effect. In order to reduce the influence of eddy current, a ring operator can be installed 30 ~ 60cm away from the bottom of the tank. The square hole size is 10cm × 10cm, and the diameter of the inner ring and the outer ring is 1 / 2 and 2 / 3 of the diameter of the ring sedimentation tank respectively, so that the separation effect can be improved.
In order to get the necessary driving force, the hot wort pump must have enough conveying capacity. If the separation effect of thermal coagulate is not good due to the insufficient transport capacity of the pump or the defects of the gyratory sedimentation tank, a wort circulating pump can be added outside the gyratory sedimentation tank, and the pump can be used to recycle the wort for 5 minutes after entering, which can effectively improve the separation effect of thermal coagulate.
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