The invention relates to a flash type
evaporator for pulping lignite through
hydrothermal treatment. The flash type
evaporator comprises a tubular body, a secondary vapor discharging
pipe arranged atthe top of the tubular body and a discharging
pipe arranged at the bottom of the tubular body, wherein two charging pipes, which are of eccentric opposite distribution and are used for conveying a
coal pulp material to the tubular body, are arranged at the middle part of the tubular body, a rotatable rotating shaft is vertically mounted in the center of the tubular body, a disc
turbine which cannot rotate relative to the rotating shaft is mounted at the middle part of the rotating shaft corresponding to the charging pipes, thus, the
coal pulp material impacts and rotates the disc
turbine, a baffling
demister is mounted on the rotating shaft in a manner of being incapable of rotating relative to the rotating shaft above the disc
turbine, and a stirrer is mounted on the rotating shaft in a manner of being incapable of rotating relative to the rotating shaft below the disc turbine. According to the flash type
evaporator for pulping the lignite through
hydrothermal treatment and the defoaming method, by adopting middle opposite charging, the wear to the bottom of the tubular body is avoided; meanwhile, the rotating shaft is driven to rotate through the rotation of the disc turbine, thus, the stirrer at the lower part of the rotating shaft can rotate to play a role in preventing
solid-liquid materials in the tubular body from
settling blockage; and the baffling
demister can rotate along with the rotating shaft to form a dynamic-uniform-distributed
demister, thus, defoaming is more effective, and the integration of defoaming and stirring is achieved.