Waste heat recovery device for formaldehyde production

The waste heat recovery device for formaldehyde production belongs to the technical field of formaldehyde production and comprises a water tank, an air inlet pipe is fixedly connected to the top wall of the water tank, a spiral heat exchange pipe is fixedly mounted on the inner side of the water tank, the bottom end of the air inlet pipe communicates with the spiral heat exchange pipe, and an air outlet pipe is fixedly connected to the bottom wall of the water tank; the bottom wall of the water tank is fixedly connected with supporting legs, the supporting legs are fixedly connected with a filter box, the bottom end of the air outlet pipe is communicated with the filter box, the side wall of the air inlet pipe is communicated with a guide pipe, the bottom end of the guide pipe is communicated with the filter box, and an air valve is installed on the guide pipe. A first exhaust pipe and a second exhaust pipe are arranged at the bottom of the filter tank, heat exchange with clear water in the water tank is achi