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Hot Dehulling

With its very low steam consumption and zero requirements for dryer and tempering bins, Bühler’s Hot Dehulling Process and associated equipment is setting new standards for efficiency in soybean preparation. Add in the fact that the product only needs to be heated once as opposed to twice in the traditional front end dehulling process, and Bühler delivers lower thermal energy costs. And unlike with a conventional front end dehulling process, the Bühler Hot Dehulling system can process soybeans fresh from harvest as well as those with higher moisture content. Ultimately this delivers a process that improves the conditions and flexibility under which flaking takes place - for maximum oil extraction. Before soybeans enter the Bühler Hot Dehulling Process they should be properly cleaned to remove sticks, pods, and trash with the Drum Magnet DFRT and Separator Classifier MTRB, or the Grain Cleaner and Separator AAOS.

Soybeans next enter the Conditioner DIRO, which has heating sections that are stacked in a criss-cross method with each section’s tubes rotated 90° from the section below. In the conditioner the soybeans are heated to the point of perspiration. The soybeans are then transported via Bühler’s conveying elements to the Fluid Bed OLHA or OTW where they are treated with hot air. The thermal shock of hot air in the pulsing Fluid Bed OLHA makes the hulls brittle and loosens the beans from the kernels.

The soybeans are then fed to the Cracking Mill OLCB or Cracker DFZL-OL, where the hot beans are cracked between one pair of fluted rolls, with the soft kernels being crushed to the required granulation and the brittle hulls being broken off.

The subsequent air-recycling separating system with Cascade Aspirator OLSA removes the hulls from the kernels. Thanks to the air-recycling principle applied, no cooling takes place. The kernels, still hot, are fed to the Flaking Mills OLFB, DOQB, or DOZC. The preconditions for achieving efficient oil extraction are created during flaking, whereby the micro fine oil cells of the soybean fragments are ruptured in the Flaking Mill. After flaking, the product is fed to the solvent extraction plant.

Bühler extraction meal processing includes grinding with the Hammer Mill Vertica DFZK, or the Horizontal Hammer Mill DFZC, sifting with the Throw Sieve DFTA and pelleting of extraction meals for feed production with the Pelleting System HYSYS or Pellet Mill Kubex, followed by cooling of the pellets in the Countercurrent Cooler DFKG. Processing of white flakes for human consumption is also possible.

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