Concentrator refers to equipment used in the concentrated production process of traditional Chinese medicine, health products, natural seasonings, food additives, food, and chemical industries. Since the invention of the concentrator, it has been widely used in the chemical industry, pharmaceutical production and processing industry, ore processing industry, sewage treatment and many other fields. The entry introduces the mainstream concentrators used in production: spherical concentrators, single-effect concentrators and double-effect concentrators. And introduced the operation rules, working principle and purpose of the concentrator.