If the jacket area is too large, then the cooling area is too large. And if at the same time,the fermentation wort_craft beer quantity is too small, then the cooling rate will be too fast, the convection will not be timely in fermenter, and the phenomenon of freezing will occur in brewery system.
2) Improper selection of temperature measurement points
Generally, there are four temperature measurement and control points at the top, middle, bottom and bottom of the conical fermenter_fermentationtank in a commercial brewery. In the normal fermentation and cooling process, the upper temperature is lower than the lower temperature, which makes the convection in the fermenter strong. In the later stage of fermentation, the convection of the fermentation wort in the tank is relatively weak. and become calmer. Therefore, during the fermentation period, the temperature measurement parameters of the fermentation tank should be selected as the temperature measurement point during the safety period.
3) The installation position of the thermometer is incorrect
If the thermometer is inserted too shallowly, the measured temperature parameters can only represent a certain local temperature, and it is not easy to control; if the thermometer is inserted too deeply, it is easy to form a large temperature gradient and cause the fermentation liquid to freeze.
4) Thermometer display error
The accuracy of the thermometer is also one of the reasons for the freezing of the fermenter.
The accurate display of the thermometer ensures that the winemaker can timely adjust the size and opening and closing of the refrigerant according to the accurate display of the thermometer. If the thermometer is deviated (for example, the temperature of the fermentation tank is high), the actual temperature of the wine liquid is too low, which will cause the fermentation liquid to freeze.
5) Improper operation
Improper operation is one of the main reasons for the freezing of fermentation broth in fermenters. The temperature of the fermentation tank is realized by the exchange of cold and heat of the refrigerant. The temperature of the refrigerant is generally between -8 °C and -4 °C. After the main fermentation reduction is completed, if the cooling rate is too fast, the temperature of the diacetyl reduction is directly reduced to 0 °C fermentation broth , the poor convection will freeze the wine liquid close to the tube wall; or if the cooling time is too long during the operation, the convection is not timely, which will also lead to freezing.
6) The temperature of the refrigerant is unstable
The temperature of the refrigerant needs to be kept stable. If the temperature of the refrigerant is too high or too low, it will have an adverse effect on the fermentation temperature control; if it is too high, it is difficult to cool down, and if it is too low, it will easily cause the wine to freeze. °C.
7) Yeast discharge is not timely
The timely discharge of yeast is a very critical step for temperature control. If the yeast that settles at the bottom of the tank cannot be discharged in time, there will be a lot of yeast mud accumulated in the tank, and the thermometer may be inserted in the yeast mud. At this time, the thermometer shows that the temperature is the temperature of the yeast mud. Instead of the temperature of the liquor, blind cooling leads to freezing.
8) Instrument failure
The temperature measuring resistance configured in the fermentation tanks of most beer enterprises adopts platinum thermal resistance and stainless steel sleeves. Since the fermentation tanks must be cleaned, imported, fermented, filtered and other production processes, the temperature of the washing liquid during cleaning is 80 ℃-85 ℃, the temperature of the fermentation broth during wine storage varies greatly from 0 to -1 ℃, and the platinum thermoelectric metal sleeve is easy to form condensed water when it encounters alternating cold and heat. Inserted at an angle of 45° downward, the condensed water is not easy to discharge, and the thermal resistance is immersed in the metal casing with condensed water for a long time, which is easy to cause the thermal resistance to fail.
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