MVR evaporator

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Working principle of MVR evaporators: MVR is an abbreviation for Mechanical Vapor Recompression. MVR evaporation technology is currently the most energy-efficient evaporation technique, and its key feature lies in the secondary compression of the vapor generated during evaporation, which allows this vapor to be used again as a heat source. Compared to traditional single-effect or multi-effect evaporation, it recycles the steam that would otherwise need to be cooled by circulating water. Its energy-saving principle lies in the fact that, by inputting only a small amount of mechanical energy, the thermal quality of the secondary steam, which would otherwise be discarded, is significantly improved, allowing it to be reused as a heat source and thereby releasing all the latent heat contained within it. The MVR evaporator adds a steam compressor unit to traditional single-effect or multi-effect evaporators, while reducing the use of condensers. The choice of evaporator type is quite flexible; membrane evaporators, forced-circulation evaporators, and natural-circulation evaporators can all be selected accordingly based on the properties of the different materials. The commonly used types of compressors are centrifugal and Roots types; for both, the effective saturated temperature rise per stage of compression can reach 25°C. However, a higher compression temperature rise in the compressor is not necessarily better; on the contrary, given a limited heat exchange area, we want the compressor’s temperature rise to be as low as possible, so that we can save more electrical energy. Product features 1) Low energy consumption and low operating costs. 2) The equipment is compact, occupies less space, and requires fewer utility installations. 3) No primary steam is required after operation, nor is a large-volume cooling circulating water system needed. 4) It operates smoothly with a high degree of automation. 5) It can evaporate at temperatures below 40°C without the need for freezing equipment, making it particularly suitable for heat-sensitive materials. 6) The temperature of the evaporated condensate is highly correlated with the temperature of the feed material; the higher the feed material temperature, the higher the condensate temperature. The energy consumption comparison is based on the evaporation of sodium chloride solution with an evaporation rate of 5 t/h and a salt content of 10%. The details are as follows: Process, Operating power (kW), Steam consumption (t/h), Operating cost (yuan/h), Notes. Single-effect evaporation: 17.6, 6.0, 912; Electricity cost: 0.7 yuan/kW▪h; Steam cost: 150 yuan/t. Three-effect evaporation: 17.6, 2.0, 312. MVR evaporation: 210.0, 0.05, 155. Application scope: Used for the concentration and evaporation crystallization of materials with a low boiling point increase; it can also be applied to materials whose normal boiling point is 120°C. It is widely used in operations such as evaporation concentration, crystallization, and distillation in fields like petrochemicals, biopharmaceuticals, food concentration, and environmental protection.