Triple-effect evaporator

► Triple-Effect Evaporator Introduction

A triple-effect evaporator is a type of evaporator primarily composed of three evaporators. During operation, the pressure and boiling point of the solution in the later effects are lower than those in the preceding effect. The secondary steam from the preceding effect is introduced as the heating medium for the later effect, making the heating chamber of the later effect the condenser for the secondary steam of the preceding effect. Generally, the first effect requires the consumption of live steam.

► Triple-Effect Evaporator Components

A triple-effect evaporator mainly consists of three sets of evaporators, condensers, salt separators, and auxiliary equipment, which are connected in series to form a complete triple-effect evaporation system.

► Triple-Effect Evaporator Working Principle

The material to be evaporated enters the first-effect heater via a feed pump for heating, then enters the evaporation chamber for evaporation. Gas-liquid separation occurs in the separator. The solution flows from the bottom of the separator into the suction port of the circulation pump, which sends it to the heater and separator for continuous circulation and evaporation. The evaporated steam enters the condenser and is completely condensed.

In the evaporation heat exchange chamber, external steam liquefies, generating latent heat to heat the wastewater. Due to the high pressure in the evaporation heat exchange chamber, the material is heated to superheat above the normal boiling point of the liquid under pressure. After the heated liquid enters the crystallization evaporation chamber, the pressure of the material rapidly decreases, causing some of the aqueous solution to flash or boil.

The steam from the wastewater evaporation enters the second-effect evaporator as a heating medium for evaporation. The unevaporated wastewater and salts are temporarily stored in the crystallization evaporation chamber. The first, second, and third-effect evaporators are connected by balancing pipes. Under negative pressure, high-salt wastewater or material flows sequentially from the first to the second and then the third effect. The wastewater is continuously evaporated, and the salt concentration in the wastewater increases. When the salt content in the wastewater exceeds saturation, the salt continuously precipitates into the salt collection chamber at the bottom of the evaporation crystallization chamber. This process repeats, achieving salt separation.

The condenser is connected to a vacuum system, which removes the uncondensed gases generated in the evaporation system, maintaining negative pressure in the condenser and evaporator to improve the evaporation efficiency. Under negative pressure, the secondary steam generated from the wastewater in the triple-effect evaporator automatically enters the condenser, where it rapidly condenses into condensate under the cooling effect of the circulating cooling water. The condensate can be continuously discharged and recovered to a water recycling pool.

► Triple-Effect Evaporator Characteristics

1. Energy Saving

Utilizes evaporated steam as energy, reducing equipment consumption.

2. Fast Speed, High-Quality Output

Not only has strong evaporation capacity but also fast water output speed.

3. Reduced Clogging and Scaling

The swirl plates inside the evaporator improve the system's heat transfer coefficient, reducing clogging and scaling.