What is the principle of multiple-effect evaporator?
A multiple-effect evaporator uses the water vapor from one effect as the heating medium for the next effect, which operates at a lower boiling point. The latent heat in water vapor can also be reused by thermally or mechanically compressing the vapor to a higher pressure and temperature.
What is the purpose of using multiple-effect evaporator?
Zero Liquid Discharge Solutions A multiple effect evaporator is an apparatus that efficiently uses the heat from steam to evaporate water. In a multiple effect evaporator, water is boiled in a sequence of vessels, each of which is at a lower pressure than the last.
What is a triple effect evaporator?
Triple effect evaporators: steam usage and heat transfer surface. Estimate the requirements of steam and heat transfer surface, and the evaporating temperatures in each effect, for a triple effect evaporator evaporating 500 kg h-1 of a 10% solution up to a 30% solution.
What is the principle of evaporator?
An evaporator is a device used in a process to turn the liquid form of a chemical substance, such as water, into its gaseous form – vapor. The liquid is evaporated, or vaporized, into a gas form of the targeted substance in that process.
What is a difference between single effect and multiple effect evaporator?
Evaporators are classified by the number of effects. In a single-effect evaporator, steam provides energy for vaporization and the vapor product is condensed and removed from the system. In a multiple effect arrangement, the latent heat of the vapor product off of an effect is used to heat the following effect.
Which product is obtained from multiple effect evaporator?
…evaporated salt is produced by multiple-effect vacuum evaporators, and an important quantity is made in so-called open crystallizers or grainers that produce a type of crystal preferred for use in some of the food industries.
What is the difference between single effect evaporator and multiple effect evaporator?
Which is the most common type of evaporator?
The dry evaporator design is the most common: the liquid refrigerant enters and flows through the evaporator and is slowly boiled off (evaporated), leaving the evaporator as a vapor.
What are the types of evaporator?
TYPES OF EVAPORATOR
- Natural/forced circulation evaporator.
- Falling film evaporator.
- Rising film (Long Tube Vertical) evaporator.
- Climbing and falling-film plate evaporator.
- Multiple-effect evaporators.
- Agitated thin film evaporators.
What is the disadvantage of a multiple effect evaporator?
Disadvantages are: high head-room requirements. higher pressure drop through the tubes than in a falling film evaporator. hydrostatic head at the bottom of the tubes may increase product temperature and cause temperature-sensitivity problems.
What is the economy of single effect evaporator?
AND ECONOMY) Economy (or steam economy) is the number kilogram of water vaporized from all the effects per kilogram of steam used. For single effect evaporator, the steam economy is about 0.8 (<1).
What is single effect evaporator?
The evaporation A conventional evaporator is heated by steam which condenses and transmits heat energy to the solution to be evaporated. As this solution boils it in turn releases vapor which may: – Either be condensed in a condenser, in which case the process is known as “single effect” evaporation.
When do you use multiple effect evaporator system?
If a single evaporator is used for the concentration of any solution, it is called a single effect evaporator system and if more than one evaporator is used in series for the concentration of any solution, it is called a multiple effect evaporator system.
How are multiple effect evaporators used in milk condensation?
BASIC CONCEPTS OF MULTIPLE EFFECT EVAPORATORS Module 1. Evaporation Milk condensing in vacuum pan uses high amount of steam to evaporate water. Multiple effect evaporator is used for steam economy. In any evaporation operation, the major process cost is the steam consumed.
Who is the author of multiple effect evaporator?
This is to certify that the project entitled “Design and simulation of a Multiple effect evaporator using Vapor bleeding” is an original work done by MonalishaNayak, Roll No. 108CH001, under my guidance and supervision. National Institute of Technology, Rourkela DEPARTMENT OF CHEMICAL ENGINEERING, NATIONAL INSTITUTE OF TECHNOLOGY, ROURKELA
How to calculate steam economy for a multi effect evaporator?
Q= UA (Ts- T1) = Ms * Hs – MS* Hc = Ms * λ U=Overall heat transfer coefficient, W/M2K q=rate of heat transfer, W Steam Economy= MV/ Ms 21. Assume area of all calendria same as A , & if no heat loss: Steam Economy: [ Mv1 + Mv2 + Mv3 ] / Ms Typical value of steam economy for a single effect evaporator is between to 2-3.
