Tube bundle heat exchanging unit and high dust gas heat exchanger

The utility model discloses a high dust gas heat exchanger. The high dust gas heat exchanger comprises a closed shell, wherein a fresh air inlet and a fresh air outlet are formed in the shell, and a waste air inlet and a waste air outlet are formed in the shell; more than two tube bundle heat exchanging units are arranged in the shell. Each tube bundle heat exchanging unit is composed of a plurality of pipelines arranged at intervals and two parallel end plates, wherein one end of each pipeline is a unit air inlet, the other end of each pipeline is a unit air outlet, and the gap between every two pipelines is a heat exchanging air channel. According to the high dust gas heat exchanger, the defect that a conventional metal plate fine type heat exchanger or other similar heat exchangers are prone to being blocked is avoided, the high dust gas heat exchanger can operate in a severe environment of livestock farms or other high dust, and the high dust gas heat exchanger is low in fault rate, easy to maintain and c