全连续精炼脱色工序 连续式脱色工艺有哪些主要特点

脱色工序的主要作用是脱除油中色素、残存的微量的皂粒和金属离子。在负压状态下采用机械搅拌和蒸汽搅拌结合的方式，脱色效果更明显。
 脱胶油入加热器加热到适当温度（110℃），进入白土混合罐。白土由低位白土箱通过风运送到白土暂存罐，白土添加实行自动计量，并与进油联锁控制。
油与白土混合后溢流到连续脱色器。脱色器采用无动力蒸汽搅拌。脱色后的油进入两台交替使用的叶片过滤机过滤。过滤后的油再经过可靠过滤器后进入脱色油储罐，脱色油储罐设计为真空罐内设喷嘴，以免脱色油与空气接触而影响其过氧化值和回色。

连续式脱色工艺有以下特点：
1、油脂与脱色剂在动态下接触充分，脱色效率，可减少脱色剂的使用量；
2、物料连续均匀地进出使得脱色时间均衡避免了油脂的氧化和酸价的回升；
3、脱色塔的搅拌结构使物料不产生死角避免了吸附剂的沉淀和管道的堵塞；
4、连续密闭效的过滤设备实现了卸饼的自动化，降低了劳动强度；
5、的吹干技术降低了滤饼含油率。

Continuous Refining Decoloring Process
The main function of decoloring process is to remove oil pigment, residual soap grain and metal ions. Under negative pressure, the mechanical mixing method combined with steam mixing will improve the decoloring effect.
The degummed oil firstly enters into the heater to be heated to the appropriate temperature (110℃), and then goes to the bleaching earth mixing tank. The bleaching earth is delivered from the low bleaching box to the temporary tank by wind. The bleaching earth is added by automatic metering and is interlockingly controlled with the oil.
The oil mixed with the bleaching earth overflows into the continuous decolorizer, which is stirred by non-powered steam. The decolored oil enters into the two alternate leaf filters to be filtered. Then the filtered oil enters the decolored oil storage tank through the security filter. The decolored oil storage tank is designed as the vacuum tank with the nozzle inside, so as to prevent the decolored oil contacting with the air and influencing its peroxide value and color reversion.

Continuous Decoloring Process Features:
1. The oil fully contacting with the decolorant can improve the decolorization efficiency and reduce the usage of decolorant;
2. The continuous and uniform material flows will balance the decoloring time and avoid the recovery of grease oxidation and acid value.
3. The special mixing structure of decoloring tower won't cause the material dead area, which can avoid the adsorbent sedimentation and pipe blockage.
4. The continuous airtight efficient filtration equipment has realized the automation of cake discharge and reduced the labor intensity.
5. The advanced drying technology can reduce the oil content in filter cake.