NOVELTY - Using cassava to form steam involves: dehydrating cassava stillage from cassava ethanol production by membrane filter press to obtain wet cassava having water content of 60-70% and supernatant; using supernatant to form biogas methane that is used for power generation, electricity is used for cassava ethanol production, biomass fuels are used for dual bituminous coal heating device, and biogas is used as heating device fuel to generate hot air; exchanging hot air through two heat emission exchangers; and subjecting wet cassava to two-stage drying to obtain biomass fuel material.    USE - For adequately using cassava to produce steam (claimed).    ADVANTAGE - The method to adequately use cassava to produce steam involves drying process including dehydrating and drying, where final biomass fuel material obtained is recycled for use into cassava drying production line for combustion device i.e. first stage of drying wet cassava to result in self generated drying process. Steam produced is processed by dust removing device and is re-used in cassava ethanol production process by liquefaction and distillation process, and provides feasible model for industry for energy saving. The drying process has large heat transfer coefficient, small thermal resistance, high heat efficiency, low unit energy consumption, and no explosion and fire danger. The method realizes comprehensive utilization of energy and circulating, so that whole cassava alcohol production line of energy system realizes self-supplying, and effectively reduces cassava alcohol production cost.    DETAILED DESCRIPTION - Method for adequately using cassava to produce steam involves: transporting large cassava stillage produced during cassava ethanol production process to dehydration plant, initially conducting programmable membrane filter press dewatering, or using decanter centrifuge for dewatering, where after preliminary dehydration, wet cassava from which water is removed and has water content of 60-70% and cassava supernatant are produced; using cassava supernatant obtained in previous step for production of biogas methane by fermentation, using gas produced for power generation, using output of electricity for cassava ethanol production, using biomass fuels for dual bituminous coal heating device for partially improving biomass hot blast furnace for increasing clean room biogas combustion device interface, and using biogas as heating device fuel where biogas is burnt to generate hot air; exchanging generated hot air from heater through two heat emission exchangers; further subjecting wet cassava produced to two-stage drying cycles, where first drying cycle uses steam drying process, in which wet cassava portion is added in drying tower to which steam is added through splitter and transported to circulating fan heater, where steam is contacted with hot air generated in heat exchanger, and resulting steam is cycled into drying tower, where in primary drying tower, circulating steam directly contacts with wet cassava part to remove water, after first drying cycle cassava has water content of 40%, and further in addition to recycling steam, rest of steam is passed through dust collector device for removing dust, purified and is re-used in cassava ethanol production process; and second drying cycle uses hot air drying process, in which wet cassava part obtained after first drying cycle through slot is passed to secondary cassava drying tower, such that cassava grain end product produced has water content of 10%, wet portion is returned to first stage drying tower and is dispersed and smoothly dried, and after drying is completed, finished cassava product is pressed through machine to obtain biomass fuel material for use into cassava drying production line for combustion device.    DESCRIPTION OF DRAWING(S) - The figure shows process for using cassava to form steam, in cassava alcohol production line.