Two groups of bare tube economizer (the upper group and the lower group) are arranged on the back of the tail flue superheater system. They are of staggered arrangement, horizontal pitch of upper group is 126mm and horizontal pitch of lower group is 76mm and vertical pitch is 45mm, tube diameter is Ф32ｘ4. Each group scour the first, second row of tubes along with the flue gas, so the anti-wear cover plate should be equipped, and the elbows should also be equipped with the anti-wear cover.
The economizer tubes are supported by the steel frames.