Abstract: A chimney, including: a chimney cylinder, and a smoke inlet. The smoke inlet is arranged on a lower part of the chimney cylinder, and includes a first side wall and a second side wall on a cross-section of the chimney cylinder. An angle ? is formed between the first side wall and a first tangent at an intersection of the first side wall and an outer wall of the chimney cylinder, and 10°???90°. An angle ? is formed between the second side wall and a second tangent at an intersection of the second side wall and the outer wall of the chimney cylinder, and 10°???90°.

Abstract: An anticorrosive dust-collecting energy-saving chimney includes a chimney barrel. A hearth spiral line with a helix angle of 10˜80 degrees is arranged on an internal wall of the chimney barrel, and an outlet of an arc flue is arranged at an outside of a bottom of the chimney barrel and in communication with the hearth spiral line. A direction of spiral of the arc flue is the same as a direction of spiral of the hearth spiral line, and the arc flue is smoothly connected to the hearth spiral line.