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Discussion of present problems for DTDC structure
  
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KeyWord:DTDC  soybean meal  pre-desolventization layer  desolventization layer  Maillard reaction
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ZUO Qing, ZUO Hui  
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Abstract:
      The problems for DTDC structure were discussed. Under the conditions of uncondensed moisture of the soybean meal on the pre-desolventization discs, scattered soybean meal, and some solvent removed, the number of the pre-desolventization discs were designed relying on the desolventization layer. 500-750 mm of layer height for desolvent layer, 10-12 r/min of stirring speed and the mixing blade shape kept the meal in suspension. The steam density 650-750 kg/（h·m2) was provided for the solvent and water azeotrope to reach the boiling point 67?℃ and easily to volatilize and strip,and the desolventization time could reduce. The temperature in the direct steam layer reached 105?℃ and improved the Maillard reaction. The installed capacity for 3 600 t/d DT reduced from 250 kW to 220 kW, the residual solvent in the soybean meal was less than 300 mg/kg, the protein solubility reached 75% or more, and steam consumption was controlled at 203-220 kg/t.
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