Waste heat recovery heat exchanger based on gas and oil boilers

The utility model provides a waste heat recovery heat exchanger based on a gas and oil boiler. The waste heat recovery heat exchanger comprises a heat exchanger shell, a third fin structure and secondstrip-shaped through holes. The heat exchanger cavity is formed in the heat exchanger shell, and the partition plate consistent with the heat exchanger cavity in diameter is welded to the upper portion of the transverse center of the inner end face of the heat exchanger cavity. The partition plate divides the furnace body into two cavities, the upper cavity is a heating cavity, and the lower cavity is a waste heat recovery cavity. The equipment is mounted at a tail flue of a boiler; waste heat in high-temperature hot smoke is recycled through heat exchange by means of the first waste heat recycling device and the second waste heat recycling device. Softened water forcibly and circularly flowing in the equipment is heated; the temperature of the softened water is increased to 60-90 DEG C from the normal temperatur