Heat pump heating type spray drying system capable of circulating waste gas

The utility model relates to the technical field of powder production equipment, and discloses a heat pump heating type waste gas recyclable spray drying system which comprises a spray drying tower, a material collecting assembly and a waste gas treatment assembly, liquid materials introduced into the spray drying tower can be dehydrated into powder materials, a dust remover of the material collecting assembly is communicated with the spray drying tower, and the waste gas treatment assembly is communicated with the spray drying tower. The material receiving cyclone dust collector is communicated with the dust collector, and the dust collector can separate powder materials from airflow mixed with the powder materials and send the powder materials to the material receiving cyclone dust collector to be collected. A heat regenerator and a first-stage surface air cooler in a cooling assembly of the waste gas treatment assembly can cool and dehumidify air flow entering a heat exchange box, a baffle is arranged in t