The invention discloses a method for recovering
waste heat of steam condensate of a
calcination plant, which comprises the following steps: carrying out secondary flashing on the steam condensate from a secondary flashing tank in the
sodium bicarbonate calcination process for preparing calcined soda by an
ammonia-soda process; recovering and reutilizing the flashed steam; and adopting a device for recovering the steam condensate of the
calcination plant. The device comprises a condensate
backflow liquid collection tank, one side of the condensate
backflow liquid collection tank is connected with the secondary flashing tank, the top end of the condensate
backflow liquid collection tank is connected with a secondary flashing second steam
pipe, the top end of the secondary flashing tank is connected with a secondary flashing first steam
pipe, one side of the secondary flashing tank is connected with a primary flashing steam condensate inlet
pipe, the secondary flashing second steam pipe and the secondary flashing first steam pipe are connected in parallel with the a
distillation steam main pipe, the bottom end of the condensate backflow liquid collection tank is connected with a
condensate pump, and the secondary flashing tank, the condensate backflow liquid collection tank and the
condensate pump are simultaneously connected to a condensate pipe of a condensate heat removal electric
boiler plant. Thus, the steam is fully utilized, and the energy sources are saved.