试验用低温巴氏杀菌设备设计与性能测试

摘要

In order to promote the application of low-temperature pasteurization in the heat thermosensitive materials, the equipment was designed. The design principle, its structural characteristics and processes were proposed, and the thermal power, heat transfer and flow resistance were analyzed. The maximum processing capacity was 13 800 mL/h with 230 mL/min of maximum flow velocity. Taking water as treatment material, the temperature of water can reach to 52℃ from 4℃ in 4. 5 s, and reduce to 20℃ from 52℃ in 3 s or 10t in 6 s. And the bacterium concentration of liquid egg white could lessen to 100 CFU/mL in 2.5 min at 55℃. The performance test shows that the system possesses a good heat-transfer capability, and a high sterilizing effect. Results provide the technical basis for the design and manufacture of low-temperature pasteurization equipment.%设计了一套试验用低温巴氏杀菌设备,阐述了设备的工作原理、主体结构和工作过程,计算了设备的传热能力.依据蠕动泵规格参数,设备最大流量为230 mL/min,最大处理能力为13 800 mL/h.采用水为处理物料,经传热能力计算可知设备满足物料的升温需要,且可以实现在4.5s内从4℃到52℃的升温,以及3 s内52℃到20℃和6s内52℃到10℃的降温.蛋清液杀菌试验表明,在55℃条件下,2.5 min可以实现菌体浓度降为100 CFU/mL.性能试验显示:设备传热能力较强,具有较好的杀菌效果.