This invention relates to the field of
coal pyrolysis technology, and more particularly to a three-stage continuous cooling structure and a semi-
coke cooling control method for a low-rank
coal pyrolysis device. The three-stage continuous cooling structure includes a transition section, an air-cooling section, and a water-cooling section. Multiple semi-
coke feeding pipes are connected to the bottom of each
carbonization chamber. The transition section, air-cooling section, and water-cooling section are arranged from top to bottom along the semi-
coke feeding pipes. A
quenching buffer section is equipped with a
quenching buffer tank, and the lower end of the semi-coke feeding
pipe is connected to the
quenching buffer tank. The air-cooling section includes an air-cooling box located around the semi-coke feeding
pipe, and the water-cooling section includes a cooling water tank located around the semi-coke feeding
pipe. The coke
discharge port at the bottom of the quenching
buffer tank is connected to a coke pushing and discharging mechanism. The semi-coke after high-temperature
carbonization is gradually cooled to a safe temperature through the three-stage continuous cooling
system, achieving gradient cooling of the semi-coke while fully recovering the
waste heat of the semi-coke. This also reduces
water consumption and prevents the semi-coke from being crushed or oxidized due to rapid cooling, effectively improving the energy efficiency and product quality of the low-rank
coal pyrolysis device.