The spiral plate heat exchanger is best used for condensation of steam and convective heat transfer without phase change, and can also be used for boiling heat transfer. Good heat transfer efficiency. The curved spiral channel and spaced columns are conducive to enhancing the turbulent flow state of the fluid. The fluid resistance in the channel is small, which can increase the design flow rate and help improve the heat transfer coefficient. For water-water heat exchange, the heat transfer coefficient can reach 1.8~3.5 kilowatts per square meter per degree Celsius [kW/(m (·℃)]. It has a self-cleaning effect. When the fluid in a single channel passes through the impurity deposits in the channel, The flow rate will be relatively increased, and impurities can be easily washed away. The non-detachable structure has good sealing performance and is suitable for heat exchange of highly toxic, flammable, explosive or precious fluids. The fluid in adjacent channels flows in a pure counter-current manner. The maximum logarithmic average temperature difference is obtained, which is conducive to heat transfer with small temperature differences and is suitable for recovering low-temperature heat energy. The heat transfer area within the unit volume of the relatively compact equipment is up to 150 meters. Due to the elastic free expansion of the spiral channel itself, the temperature difference stress is small. . Low price. Disadvantages: The key to choosing a spiral plate heat exchanger is the problem of clogging. Although it has a self-cleaning function, clogging may occur due to improper design or operation. In this case, it is difficult to use a detachable structure. Cleaning method. Use water, gas or steam to purge, which is easier to operate and more effective. The biggest disadvantage of the spiral plate heat exchanger is that it is difficult to repair. If the inner ring spiral plate breaks, the entire equipment will be scrapped.