The distillation tower of a fine chemical company is a high vacuum system. Previously, it used a 40㎡ shell-and-tube heat exchanger and -10℃ frozen brine as the refrigerant. After the technical transformation, it used a 10㎡ spiral wound tube heat exchanger and replaced the frozen brine with circulating water, which greatly saved the cost of preparing the refrigerant. At the same time, it is very convenient to install and maintain. The Yeguan wound heat exchanger not only meets the process requirements, but also mainly uses circulating water instead of frozen brine. By saving energy and reducing consumption, the equipment investment can be quickly recovered.