Straight fin for device for recovering waste heat of raw coke oven gas in ascension pipe of coke oven, and heat recovering device

A straight fin for a device for recovering waste heat of raw coke oven gas in an ascension pipe of a coke oven, comprising:

• a straight fin body and a plurality of V-shaped notches disposed on the straight fin body;
• a depth of the plurality of V-shaped notches is less than a width of the straight fin body;
• and distances between the V-shaped notches adjacent to each other increase from bottom to top in a longitudinal direction of the straight fin body, wherein the plurality of V-shaped notches are sequentially numbered Q1 to Qn−1 from bottom to top in the longitudinal direction of the straight fin body;
• a distance from Q1 to a bottom of the straight fin body is L1, the distances between the V-shaped notches adjacent to each other from bottom to top are L2 to Ln−1, and a distance from Qn−1 to a top of the straight fin body is Ln;
• and values of L1 to Ln increase.