The contact surface of the equipment is made of high quality stainless steel. The surface is smooth, clean and beautiful, in line with national food hygiene and chemical CMP standards, and is composed of head, cylinder, jacket, external insulation and agitation, to form heating and heat transfer interlayer. Materials are added to the tank, steam enters the interlayer and heat exchange is carried out to achieve the purpose of dissolving and stirring. Pressure gauge and safety valve are provided on the pipe connected with the interlayer to determine the pressure in the interlayer. Equipped with instruments, the operator can keep abreast of the working conditions inside the equipment.