Mechanical Vapor Recompression Evaporator(MVR)

Basic Principles

MVR(Mechanical Vapor Recompressor) evaporator utilizes secondary steam generated in the evaporator, which is then compressed by a compressor. This compression increases pressure thus saturated temperature and enthalpy.

The compressed steam is then sent to the heating chamber of the evaporator for use as heating resources. By this way, the latent heat in the secondary steam can be maximized and reutilized since the majority of the latent heat remains in the exhausted steam (more than 95%). With the assistance of MVR, just very limited amount of energy to be used to compress the steam to a higher saturated temperature. Thus, the secondary steam can be effectively re-used.

When employing an MVR evaporator, the theoretical energy consumption is approximately 1/10 to 1/20 of that of multiple-effect evaporation, and significantly reduce the demand for external heating and cooling energy.

MVR main advantages.

1. Energy-saving: MVR technology is currently an advanced evaporation technology, requiring only 15-30 kWh per ton of water for evaporation, depending on the boiling point elevation of specific product. The evaporation process consumes very little steam, or in some cases, no steam at all.

2. Enhanced Product Quality: Compared to traditional evaporators, MVR evaporators have a much smaller temperature difference between product side and steam side, enabling more gentle evaporation. This reduces color formation and avoid degradation of the product, thus significantly improving product quality.

3. Reliability: No condenser is required, or only a very small condenser is needed (about 1/20 of a multiple-effect evaporator). The mechanical structure and process can be very much simplified, easy for fully automatic controlling, continuous and stable operation, thus ensuring the reliability.

4. Convenient CIP System: The equipment is equipped with a Cleaning In Place (CIP) system, allowing f on-site cleaning with no dead volumes. The entire set of equipment is easy to operate.

5. Footprint saving: The installation space required for MVR evaporators is less compared to multiple-effect evaporators.

Typical Applications in Industrial Biotechnology:

· Starch Industry: Concentration of corn steep liquor.

· Amino Acid Industry: Concentration of fermentation broth, Glutamic acid, Lysine, Effluents of Ion Exchange (Ammonium Sulphate, etc.).

· Organic Acid Industry: Citric acid, lactic acid, etc.

· Starch sweeteners Industry: glucose syrup, fructose syrup, maltose syrup, polyols, oligosaccharides, etc.

· Dairy Products (Whey, Milk)

· Concentration of Fruit Juices (Orange Juice, Tomato Juice)

· Fermentation waste: yeast vinasses, ethanol vinasses, antibiotic waste water ,etc