Modular energy saver for petrochemical waste heat furnace

The utility model particularly relates to a modularized energy saver for a petrochemical waste heat furnace, which comprises an end sealing box, an end tube plate, a snakelike finned tube, a middle tube support, a profile steel frame, a smoke inlet, a smoke outlet, an inlet header and an outlet header, the end sealing box is fixed on one side of the end tube plate, and an elbow part of the snakelike finned tube is positioned in the end sealing box. The S-shaped finned tubes are fixed to the end tube plates on the two sides and the middle tube supports in a sealed mode through the sleeves, the end tube plates and the middle tube supports are fixed in the profile steel frame, the two ends of each S-shaped finned tube are welded to the inlet header and the outlet header respectively to form a pressed part, and the pressed parts are integrally fixed to the profile steel frame to serve as modular parts. A smoke inlet is formed above the profile steel frame, a smoke outlet is formed below the profile steel frame, a