Project Introduction: In response to the traditional economizer's use of round tube flat fin arrangements, which result in significant pressure drop loss and severe ash accumulation issues, a type of elliptical tube H-type fin heat exchanger has been developed to reduce the flow resistance of the heat exchanger and mitigate thermal losses caused by ash accumulation. Results and Advantages: This heat exchanger integrates multiple technologies for reducing flow resistance, enhancing heat transfer, and mitigating ash accumulation. Firstly, triangular fins are added to the surface of the heat exchanger to increase the heat transfer effect on the fin surface; at the same time, a coordinated arrangement of multiple fins is used. In the regions with relatively low flow velocity at both ends of the fin, larger attack angles and dimensions are employed to enhance the disturbance effect; in the middle part of the fin, where the turbulent region with higher flow velocity is located, smaller attack angles and fin dimensions are used to reduce the thermal resistance of the viscous base layer. Secondly, the heat exchanger uses an elliptical tube arrangement, which can 'suppress flow separation, reduce post-tube recirculation, "Reducing Shape Resistance." Furthermore, by combining elliptical tubes with small fins, it is possible to "increase the disturbance in the vortex attachment area in front of the tube, introduce high-speed fluid into the rear of the tube, and reduce the distribution of lower velocity areas on the tube wall," thereby reducing particulate deposition. This allows the heat exchanger to operate efficiently for extended periods in a dusty flue gas environment. Research has shown that under the same geometric parameters, when the inlet wind speed is 5 m/s, the pressure drop of an elliptical tube is 20% less than that of a round tube, and compared to a flat finned round tube, the dust particle deposition rate decreases by more than 50%. Application scenarios and fields: This heat exchanger is suitable for waste heat recovery processes from industrial boilers and power station boilers among various industrial processes. It not only improves the thermal recovery efficiency of equipment but also reduces the thermal pollution to the environment caused by low-temperature waste heat, increasing additional environmental and economic benefits, and has good application prospects. The project is part of the National Key Basic Research Development Plan ( The research was carried out under the support of the 973 Project (2013CB228304) and the Key Project of National Natural Science Foundation of China (NSFC)-Guangdong Joint Fund (No.U0934005).