Raw materials and water are added into a batching tank, alkali is added into the batching tank to adjust the PH value and high-temperature resistant enzyme is added, the slurry is pumped into an injection liquefier by a pump after the slurry is evenly stirred, the slurry and steam directly meet in the ejector, the discharging temperature is controlled, and the slurry coming out of the ejector enters a laminar flow tank for heat preservation for a period of time. Then carry out secondary injection, the feed liquid and steam in the second injector directly meet, the temperature rises, and the high-temperature resistant enzyme is completely killed by maintaining the high temperature for several minutes or so, at the same time starch is further dispersed, and protein is further solidified. Then the feed liquid enters a vacuum flash cooling system to cool down and keep for a few minutes, at the same time, the PH value is lowered and enzymes are added, after saccharification to the end point, the feed liquid is sprayed and heated and cooled to inactivate enzymes, the filter is firstly used for slag removal and filtration, then the temperature is raised, old activated carbon is added for decolorization, decolorization and filtration are carried out, then the sugar liquid is subjected to secondary decolorization, heat exchange and temperature reduction are carried out after decolorization, and cross-fertilization is carried out. The separated sugar solution is concentrated by a plate evaporator to obtain a product, and the product requirement is met.
