Detailed introduction
　　I. Overview of Dual-effect Concentrator
　　Dual-effect concentrator is also called double-effect evaporator. It is called double-effect external circulation concentrator and double-effect external circulation vacuum concentrator. It is suitable for the concentrating of traditional Chinese medicine, western medicine, glucose, starch, dairy, chemical and other materials, especially for the low-temperature vacuum concentrating of heat-sensitive materials. The double-effect concentrator consists of one-effect tube heater, one-effect evaporation chamber, two-effect tube heater, two-effect evaporator, condenser cooler, vacuum solvent recovery tank, plate heat exchanger and vacuum buffer tank. In the double-effect production, the secondary steam of the first-effect evaporation chamber is used to supply the second-effect heating chamber. The second-effect makes full use of the heat of the first-effect, saves heat, saves energy and environmental protection, and saves time and effort.
　　CHARACTERISTICS OF DOUBLE-EFFECT CONCENTRATOR
　　1. Energy-saving benefits, according to SJN-1000 calculation, annual savings of steam about 3500 tons, water about 9 tons, electricity about 80,000 degrees, equivalent to RMB 100-150,000 yuan (compared with single effect).
　　2. Double-effect concentrator adopts negative pressure external heating natural circulation evaporation mode, which has fast evaporation speed and large concentration ratio, reaching 1.1-1.35 (general Chinese herbal extract).
　　3. Double-effect concentrator uses two-effect evaporation at the same time. Secondary steam is used. The total energy consumption is reduced by 50% compared with single-effect concentrator. The energy-saving cost of one year can recover all the investment of the concentrator.
　　4. Multifunctional operation features:
　　(1) 80% recoverable alcohol concentration;
　　(2) Single-effect, double-effect and triple-effect can be repeated and pot ointment can be collected.
　　(3) It can feed intermittently and continuously.
　　5. Dual-effect concentrator and material contact parts are made of stainless steel, which meets the requirements of GMP standard. Beautiful appearance. There is an insulating layer outside the heater and evaporator. The outer insulating layer is made of stainless steel sheet, and the surface is treated by mirror or matt.