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MULTI-EFFECT EVAPORATION&CRYSTALLIZATION

Multiple effect evaporator is the combination of several sets of single effect evaporator. The characteristics is to heat the next effect evaporator by using vapor produced from the previous effect, so as to reduce energy consumption. Usually there are Dual-effect evaporator, Tri-effect evaporator or even more effect evaporation system.In multi effect evaporation, the operating pressure of each effect, the corresponding heating steam temperature, and the boiling point of the solution decrease sequentially.

Working Principle of Multi-effect Evaporator

Advantages of MVR Evaporator

  • Multi-effect evaporator is widely used, with strong tolerance characteristics, especially suitable for high salt, high COD refractory wastewater. It is suitable for materials with particularly high boiling point rise of saline solution (such as calcium chloride, caustic soda, etc.). 
  • The multi-effect evaporator has large elasticity, large adjustable range, and the coefficient can reach 20-110%. 
  • Multi-effect evaporator can adopt different multi-effect evaporation process or even combined process (downcurrent, countercurrent, parallel current and cross flow) according to the actual situation. 
  • Multi-effect evaporator equipment is relatively simple and has a low maintenance cost.

Disadvantages of MVR Evaporators

  • The multi-effect evaporator requires constant live steam for heating. 
  • The secondary vapor of the multi-effect evaporator requires condensation of the condensing system and a large amount of cooling water circulation.

Multi-effect Forced Circulative Evaporationg & Crystallization

Application
Suitable for evaporation and crystallization of high salt water treatment and widely applied in industries of chemicals,pharmaceuticals and wastewater treatment.
Multi-effect Forced Circulative Evaporationg&Crystallization

Multi-effect Falling Film Evaporation

Application
Suitable for evaporation and concentration of water or organic solvent solutions (such as ethanol) in industries such as traditional Chinese medicine, food, chemical, and light industry. Especially suitable for concentration of multiple varieties, batches, and low viscosity solutions.
Multi-effect Falling Film Evaporation

Multi Effect Forced Circulation Evaporator (crystallizer)

Multi-effect evaporation is a mature and reliable evaporation process using secondary steam energy repeatedly. Its combination with different vapor-liquid separator and crystallizer can achieve concentration and crystallization process of different materials to meet various processing requirements.

Technical Characteristics

  Reasonable use of secondary steam to reduce energy consumption
  Diversified processes to adapt to different materials feeding and discharging methods
  Less investment than MVR evaporation system

Process Flow Diagram

Three-effect forced circulation evaporator
Three-effect forced circulation evaporator
Four-effect forced circulation evaporator
Four-effect forced circulation evaporator

Energy Efficiency Comparison Of Multi-effect Evaporator

Forced Circulation

 Evaporation Compressor Energy Consumption Energy Consumption Of Other Components Fresh Steam Consumption Circulating Cooling Water Final Estimated Annual Cost
2t (Three-way) Not using a compressor 60Kw 800Kg 70m³ (60*0.7+800*0.22+70*0.2)*7200=167.04 ten thousand yuan
5t (Three-way) 98.5Kw 2000Kg 110m³ (98.5*0.7+2000*0.22+110*0.2)*7200=382.2 ten thousand yuan
10t (Three-way) 150Kw 4000Kg 220m³ (150*0.7+4000*0.22+220*0.2)*7200=740.88 ten thousand yuan
20t (Four-way) 270Kw 6000Kg 400m³ (270*0.7+6000*0.22+400*0.2)*7200=1144.0 ten thousand yuan
30t (Four-way) 370Kw 9000Kg 600m³ (370*0.7+9000*0.22+600*0.2)*7200=1698.4 ten thousand yuan
50t (Four-way) 500Kw 15000Kg 1000m³ (500*0.7+15000*0.22+1000*0.2)*7200=2772 ten thousand yuan
* Data in the table are hourly except for the last column; Electricity is counted as 0.7 yuan/kW, steam as 220 yuan /t, cooling water as 0.2 yuan /t.

The multi-effect evaporator is relatively traditional in structure, but compared with the MVR evaporator, the multi-effect evaporator has stronger compatibility: even some of the materi- als that will cause the MVR evaporator can not operate normally (such as calcium chloride, magnesium chloride and other materials with higher boiling point rise), the multi-effect evap- orator can easily handle.

The type of multi-effect evaporator is also relatively diverse, which is part of the reason why the multi-effect evaporator can accept a wide variety of materials.
 
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