Double-decomposition horizontal dry quenching furnace for low-rank coal

The invention discloses a double-decomposition horizontal dry quenching furnace for low-rank coal. The furnace comprises a screw feeder, a fluidized bed dryer, a cyclone separator, a screw conveyor, alow-temperature dry distillation chamber, a medium-temperature dry distillation chamber, a semicoke dry quenching heat exchange device, a discharge control valve and a semicoke cooling conveyor whichare sequentially arranged and connected according to a coal treatment sequence, wherein the low-temperature dry distillation chamber and the medium-temperature dry distillation chamber are adjacentlyarranged in a left-right direction to form a horizontal dry distillation and pyrolysis furnace body structure; the spiral conveyor is connected to a feeding port of the low-temperature dry distillation chamber; a pushing device used for horizontally pushing coal into the furnace body is arranged on the feeding port of the low-temperature dry distillation chamber; a gas separation outlet of the cyclone separator is connecte