The heating system is a process system that provides sufficient heat source for the whole evaporative crystallization system. In addition to providing heat source for the main unit, it also needs to preheat some materials. After separation, some materials need to be insulated. According to different material properties, the heating system is the key guarantee system to ensure the evaporative crystallization effect and stable operation. According to different heat sources, it can be divided into steam heating system, hot water system and heat transfer oil system. Tuochi can calculate and optimize energy consumption for different heat sources, and try to use waste heat, heat pump, recompression and other methods for energy-saving design to reduce system energy consumption. In addition, it needs to consider overheat protection, explosion-proof requirements, etc., so as to save operating costs for customers and consider safety factors at the same time.