The small and medium-sized test equipment is made of stainless steel and can be designed for normal, reduced and pressurized use. The tower kettle can be designed with electric heating, thermal oil, steam and other heating methods. The specifications of the tower sections can be customized, and each tower section can be equipped with a feed port/temperature measurement port. In order to avoid heat loss during the operation of the tower, modern intelligent instruments are used to set the temperature of the tower to provide heat compensation, so that the experimental process can be closer to the ideal state to a greater extent and achieve better experimental results.