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錐形發酵罐的壓力如何控制？

作者：山東天泰人氣：发布日期： 2022-03-25

信息摘要：

在啤酒釀造的發酵階段，除了要控制好發酵罐內的溫度,壓力也是重要的工藝參數。

錐形發酵罐的壓力如何控制？

在啤酒釀造的發酵階段，除了要控制好發酵罐內的溫度,壓力也是重要的工藝參數。罐压较高时虽然制约了酵母繁殖与發酵速度,却有利于双乙酰的还原,而且能明显抑制乙酸乙酯、异戊醇等风味阈值较低的發酵副产物的生成。生产中可根据酵母出芽情况逐步加压,發酵终了时缓慢减压。以下压力控制原则可供参考。
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     ①加压發酵总是与高温發酵相伴而行高温發酵通过加压措施,可抑制酵母过多增殖,避免产生过多代谢副产物。加压發酵控制加压时间很重要,加压过早,酵母增殖受到抑制,影响發酵速度;加压太晚,又会增加代谢副产物的产生。因此,分段缓慢升压是可取的。
     ②主發酵前期由于双乙酰已经开始生成,因此在开始阶段产生的CO₂和不良揮發性物質應及時排除,這時采取的是無壓或微壓(0.01~0.02MPa)。一般待外觀發酵度爲30%左右,即酵母第一次出芽已全部長成時才開始封罐升壓。
     ③当外观發酵度为60%左右时,酵母第二次出芽长成,發酵开始进入旺盛期,此时应将罐压升到最大值,一般0.07~0.1MPa。在發酵旺盛期应保持罐压稳定不变,以使双乙酰迅速被还原。另外,较高的罐压还有利于CO₂的飽和。
     ④主發酵后期,双乙酰的还原基本结束,所以压力应缓慢下降,直到完成。这样既有利于排除一部分未被还原的双乙酰,还可以防止酵母细胞内含物的大量渗出及对酵母细胞的压差损伤。

【相關推薦】

上一條錐形發酵罐使用過程中出現異常現象如何處置?
: 下一條如何調節與控制錐形發酵罐的溫度？

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