Gas-fired boiler economizer with hydrophobic anti-corrosion sealing structure

The utility model particularly relates to a gas-fired boiler economizer with a hydrophobic anti-corrosion sealing structure, which comprises a shell, a tube plate, coiled tubes, a smoke inlet, a smoke outlet, an automatic water drainage device and two internal sealing boxes, the smoke inlet is arranged on one side of the shell, the smoke outlet is arranged on the other opposite side of the shell, a plurality of coiled tubes with spiral fins are arranged in the shell, and the coiled tubes with the spiral fins are connected with the automatic water drainage device. The tube plates are arranged in the shell, the two internal sealing boxes are fixed to one sides of the two tube plates in a sealed mode respectively and wrap the two ends of the coiled tube, water drainage holes are formed in the lower ends of the tube plates, and the automatic water drainage device is connected to the bottom of the shell. The structure is simple, the anti-corrosion problem can be effectively solved, the welding amount is greatly re