Fully utilize the thermal energy of the liquefaction section and adopt a one-time jet liquefaction process. The heat released by flash evaporation per cubic meter of liquefied liquid can evaporate more than 200kg of water; Adopting the secondary jet liquefaction process, the heat released by flash evaporation per cubic meter of liquefied liquid can evaporate more than 500kg of water, and the liquefied liquid does not require cooling water to drop from the liquefaction temperature to the saccharification temperature.