A system for drying lignite, the system comprising: a mill configured to crush the lignite; and a dryer configured to receive crushed lignite from the mill, to dry the lignite by heat-exchange with steam and to discharge dried lignite; characterized in that the system further comprises: a condensing-precipitating evaporator in fluid communication with the dryer so as to receive vapor which is evaporated when the lignite is dried and which is discharged from the dryer, wherein the condensing-precipitating evaporator is configured to condense the vapor discharged from the dryer by heat-exchange with water and to thereby generate steam, wherein coal dust contained in the vapor is precipitated into a condensed aqueous solution when the vapor is being condensed, and wherein the condensed aqueous solution is discharged; and a Mechanical Vapor Re-Compressor configured to receive steam generated from the condensing-precipitating evaporator to compress the steam into superheated steam and to supply the compressed superheated steam to the dryer, wherein the system further comprises a heat-exchanger configured to receive some of the superheated steam compressed in the Mechanical Vapor Re-Compressor and configured to convert the vapor discharged from the dryer into superheated vapor by heat-exchange with the superheated steam and supply some of the superheated vapor back to the dryer to make the superheated vapor act as a sweep gas in the dryer. a mill configured to crush the lignite; and a dryer configured to receive crushed lignite from the mill, to dry the lignite by heat-exchange with steam and to discharge dried lignite; characterized in that the system further comprises: a condensing-precipitating evaporator in fluid communication with the dryer so as to receive vapor which is evaporated when the lignite is dried and which is discharged from the dryer, wherein the condensing-precipitating evaporator is configured to condense the vapor discharged from the dryer by heat-exchange with water and to thereby generate steam, wherein coal dust contained in the vapor is precipitated into a condensed aqueous solution when the vapor is being condensed, and wherein the condensed aqueous solution is discharged; and a Mechanical Vapor Re-Compressor configured to receive steam generated from the condensing-precipitating evaporator to compress the steam into superheated steam and to supply the compressed superheated steam to the dryer, wherein the system further comprises a heat-exchanger configured to receive some of the superheated steam compressed in the Mechanical Vapor Re-Compressor and configured to convert the vapor discharged from the dryer into superheated vapor by heat-exchange with the superheated steam and supply some of the superheated vapor back to the dryer to make the superheated vapor act as a sweep gas in the dryer. a condensing-precipitating evaporator in fluid communication with the dryer so as to receive vapor which is evaporated when the lignite is dried and which is discharged from the dryer, wherein the condensing-precipitating evaporator is configured to condense the vapor discharged from the dryer by heat-exchange with water and to thereby generate steam, wherein coal dust contained in the vapor is precipitated into a condensed aqueous solution when the vapor is being condensed, and wherein the condensed aqueous solution is discharged; and a Mechanical Vapor Re-Compressor configured to receive steam generated from the condensing-precipitating evaporator to compress the steam into superheated steam and to supply the compressed superheated steam to the dryer, wherein the system further comprises a heat-exchanger configured to receive some of the superheated steam compressed in the Mechanical Vapor Re-Compressor and configured to convert the vapor discharged from the dryer into superheated vapor by heat-exchange with the superheated steam and supply some of the superheated vapor back to the dryer to make the superheated vapor act as a sweep gas in the dryer.