What is the purpose of using multiple effect evaporator?

What is the purpose of using multiple effect evaporator?

A multiple-effect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water. In a multiple-effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last.

What is the reason for using decreasing pressure on every subsequent effects in a multiple effect evaporator?

2. What is the reason for using decreasing pressure on every subsequent effects in a multiple effect evaporator? Explanation: The main reason to reduce the pressure is to be able to decrease the boiling point so that the previous effect’s vapour can evaporate the water in this effect.

Which principle is used in concentration of juice by using multiple effect evaporator?

In a series arrangement, or multiple effect, the Rillieux Principle states that one unit of steam will evaporate as many units of water as there are vessels, or effects. Thus, in a generally used four-unit series, or quadruple effect, one unit of steam would evaporate four units of water.

Which of the following do we prefer for single effects over multiple effects evaporator Mcq?

Which one of the following do we prefer to use for single effect over multiple effect evaporator? Explanation: Single effect evaporators are better than multiple effect because expensive materials of construction can be used as is the case with corrosive feeds, and when the vapour is too contaminated to be reused.

Which principle is used in a concentration of juice by using multiple effect evaporator?

Steam economy dictates the application of the multiple effect principle. An appropriate installation makes use of a quadruple or quintuple effect arrangement with sufficient capacity to evaporate the water and is so designed to provide vapor for juice heating and vacuum pan operation.

What is the difference between single effect evaporator and multiple effect evaporator?

Economy calculations are determined using enthalpy balances. The economy of a single effect evaporator is always less than 1.0. Multiple effect evaporators have higher economy but lower capacity than single effect. The thermal condition of the evaporator feed has an important impact on economy and performance.

In which multi effect evaporator arrangement feed is introduced in every effect and steam is introduced in first effect?

1. Forward feed : In this arrangement, the thin liquid feed flows in the same direction as the vapour flow. Fresh feed enters the first effect and steam is also fed to a steam chest of the first effect.

What is the source of heat in most of the evaporator?

water vapor
The heat source for almost all evaporators is water vapor, either in the form of boiler steam or waste vapor from another process.