Notice: Undefined variable: kkg in /home2/jbmpr32v/public_html/product_deatils.php on line 122
Multiple Effect Evaporators
The multiple-effect evaporator combines two or more evaporator bodies to conserve steam, which is condensed in the first-effect heat exchanger only. Water evaporated in the first-effect vapor body is condensed in the second-effect heat exchanger, which provides energy for evaporation in the second-effect vapor body (and so on for additional effects). Vapor from the last effect flows to a condenser. The last-effect vapor body is maintained at a high vacuum with a steam-jet air ejector or mechanical vacuum pump.
The driving force is the pressure drop from the first to the last effect. For the same overall pressure differential and process conditions, the evaporator with more effects will require less steam. The evaporation in each effect will be higher for each pound of steam condensed in the first-effect heat exchanger. For the same evaporation rate, a multiple effect evaporator will require less steam than required for a single-effect evaporator. In actual practice, the steam economy can vary widely because of differences in feed temperature and other energy requirements such as heats of dilution and crystallization. The number of effects is limited by the total available temperature difference between the plant steam and the cooling water temperature. Process liquors with high boiling point elevations typically operate with fewer effects.
- DOWNLOADS
- ENQUIRE NOW
Working Principle
The multiple effect evaporation system is formed a sequence of single effect evaporators, where the vapor formed in one effect is used in the next effect. The vapor reuse in the multiple effect system allows reduction of the brine and thetemperature to low values and prevent rejection of large amount of energy to the surrounding, which was the main drawback of the single effect system.
Applications
Multiple effect evaporators are used for concentration of liquids and effluents in pharmaceuticals, textiles, chemicals, piugments, dyes, sugar industries, distilleries and water and effluent treatment plants
Capacities
Depending on application
