Coking fractional column

The utility model discloses a coking fractionating tower. In the structure of the coking fractionating tower, an outlet of a downcomer on a heating tower plate on a first layer is arranged under liquid level of oil liquid of the tower bottom, and the interior of the downcomer on the heating tower plate on the first layer is provided with a bubble removing device; the interiors of the downcomers on the tower plates on a second layer and a third layer are provided with dirt collection device. The normal state of the gas-liquid phase water flow on the tower plates can be ensured through the coking fractionating tower, and the tower plates can be ensured to play normal mass-transfer and heat-transfer effects.