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This utility model relates to the field of dry desulfurization and discloses an absorption tower for dry desulfurization and denitrification using activated coke. The absorption tower includes an inlet pipe fixedly connected to its side wall, an outlet pipe fixedly connected to its top via a tower cover, a first diversion plate fixedly connected to its inner wall, a second diversion plate fixedly connected to its inner wall, and diversion holes perforated on the surface of the second diversion plate. A support ring is fixedly connected to the inner wall of the absorption tower, a placement plate is mounted on top of the support ring, and through holes perforated on the surface of the placement plate. A feed pipe is fixedly connected to the inner wall of the absorption tower, and a turbulence-inducing component is installed inside the absorption tower. In this utility model, by configuring the first diversion plate, the second diversion plate, and the diversion holes, the flue gas is sheared into multiple streams that uniformly contact the activated coke particles, ensuring sufficient contact between the activated coke particles and the flue gas, and improving the desulfurization and denitrification effect.