The invention relates to a belt conveyor (1) having a conveyor roller (5) and such a conveyor roller (5) comprising a drum shell (54), a fluid connection (55), and at least one first fastening element (52) for fastening the conveyor roller (5) in a conveyor frame (3), wherein the drum shell (54) has an exterior pipe (541), which is rotatably supported about the first fastening element (52), wherein the exterior pipe (541) has a plurality of fluid outlet orifices (545) on the circumferential surface (543) thereof, and wherein the fluid connection (55) is in communication with the fluid outlet orifices (545).