Heat exchange pipeline for high-temperature flue gas

The heat exchange pipeline comprises a heat exchange pipeline body, an impurity filtering structure is arranged at the position, close to the bottom end, of the interior of the heat exchange pipeline body, a sliding block is embedded in a limiting sliding groove, one end of the sliding block is connected with an installation frame, a handle is installed on one side of the installation frame, and the handle is arranged on the other side of the installation frame. And a filter screen is mounted in the mounting frame. The limiting sliding grooves are formed in the two sides of the interior of the heat exchange pipeline body, the limiting sliding grooves and the sliding blocks are embedded to complete certain sliding work, then after the handle is held by the limiting sliding grooves, certain stretching treatment can be conducted on the limiting sliding grooves, and when dust accumulates on a filter screen or other problems exist, the limiting sliding grooves can be pulled out after force is applied to the handle