Spiral-wound tube heat exchanger uses 304 stainless steel for its shell, without considering corrosion allowance, significantly reducing its weight. The heat exchange tubes are made of 316L stainless steel (a micro-carbon stainless acid-resistant steel with good corrosion resistance and intergranular corrosion resistance, suitable for use as an important corrosion-resistant material in the chemical, fertilizer, and chemical fiber industries). Design concept: It is designed for asymmetric flow, with the heat exchange tubes spirally wound inside the shell for a length that is 4 to 6 times that of the shell side. This allows the gaseous medium to stay in the heat exchange tube bundle for a longer period of time, resulting in more thorough condensation and better performance. The shell volume is 4 times the volume of the tubes, which can increase the fluid velocity in the space outside the tubes to enhance the heat transfer film coefficient of the shell side of the heat exchanger. The fluid velocity is generally between 3m/s and 5.5m/s. Inside the heat exchanger, forward and reverse spiral-wound tubes are used, with a gap of 1 to 2mm between tubes, enhancing the turbulence effect of the fluid. There are no dead zones in heat exchange, ensuring that all fluid participates in the heat exchange process. Its heat transfer coefficient can reach up to 14000W/m2.℃.