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Design Configuration And Simulation Of A Multi Effects Evaporator For A Desalination Plant Ethar Ali, Dr. Ahmed Elzain Elhassan, Hamid M. Mustafa, Omer Hassan Abdelrhman Alyas Abstract: This research is focused on the economic feasibility of using multi-effect evaporators (MEV) for the production of potable water, for the city of
Figure 1. Schematic view of industrial Multi-Effect evaporation (McCabe et al., 2001). Figure 2. Schematic view of a horizontal tube Multi-Effect Distillation plant (IDE Design, Internet publication). Steam condensation inside horizontal tubes and seawater evaporation on the outer side is the heart of one of the most common MED processes.
Sep 01, 2018· Superficially, the design of multi-effect evaporators appears deceptively straightforward. Consider the most common situation in which water is the very volatile component and the other component is a solid (or has a very high boiling point). The vapor generated in each stage is almost pure water.
volumes create design problems. Calculations on evaporators can be carried out combining mass and energy balances with the principles of heat transfer. EXAMPLE 8.1. Single effect evaporator: steam usage and heat transfer surface A single effect evaporator is required to concentrate a solution from 10% solids to 30% solids at the rate of 250kg ...
Three principal elements are of concern in evaporator design: The model includes overall as well as component mass heat transfer, vapor-liquid separation, and efficient energy balance equations, energy balance equations and heat transfer consumption. ... A multiple-effect evaporator is an evaporator system in which the vapor from one effect is ...
effect, e.g. with the feed to the evaporation system, the target product concentrates in the first effects and can be crystallized out of a mother liquor which is only slightly contaminated with escort substances. 3. Thermodynamic Design The thermodynamic design of multiple-effect forced-circulation evaporator
solution . The multi-effect evaporator uses the secondary steam produced in the evaporation production as the heat source of the next unit. Such as, liter film multi-effect evaporator, falling film multi-effect evaporator , steam recompression multi-effect evaporator. Multi-effect Evaporator Design Select Design Software and Reasons
Module #3 DESIGN OF EVAPORATOR: INTRODUCTION, TYPES OF EVAPORATORS, METHODS OF FEEDING OF EVAPORATORS, GENERAL DESIGN CONSIDERATION OF EVAPORATOR. sindisiwe mvundla. callme gech. sindisiwe mvundla. callme gech. Related Papers. Evaporation is the removal of solvent as vapor from a solution or slurry.
Sep 16, 2016· M ultiple - effect evaporator. The single effect evaporator uses rather more than 1 kg of steam to evaporate 1 kg of water. The latent heat of the vapor leaving in single effect evaporator is not used but is discarded.; Much of this latent heat, however, can be recovered and reused by employing a multiple - effect evaporator, that is, vapor from one effect serves as the heating medium for the ...
EVAPORATORS TYPES AND DESIGN In the evaporation process, concentration of a product is accomplished by boiling out a solvent, generally water. The recovered end product should have an optimum solids content consistent with desired product quality and operating economics. It is a unit operation that is used extensively in processing foods,
The RDG evaporator design, based on patented technologies, is ideal for multiple-effect systems, as each effect can be optimized for both vapor and fluid functional conditions to achieve optimum evaporation. This ability, together with our complete system design, allows us to lead the market for efficiency and reliability.
Jun 17, 2018· A multiple-effect evaporator 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.
Figure 2. Temperature profile in single-effect and condenser arrangement. 2.1. Performance Ratio of the Single-effect Distillation System Consider the single-effect distillation (SED) system shown in Figure 1. Assume that S is the mass flow rate of the heating steam to the evaporator in kg s-1 and that the steam
Possible Methods to Solve Multiple Effect Problems Several approaches can be used to solve the typical multiple effect evaporator homework problem. All textbooks 3,4,5 that cover evaporation present a pencil-and-paper iterative approach. Although this method works and requires no expensive software, it has a number of limita tions.
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multiple effect evaporator the vapour from one evaporator is fed into the steam chest of the other evaporator. In such a system, the heat from the original steam fed into the system is reused in the successive effects. 1.1 Application of evaporators Evaporators are integral part of a number of process industries namely Pulp and Paper, Chlor ...
For a multiple effect evaporator system calculations, the values required to be obtained are (i) The area of the heating surface in each effect, (ii) The kg of steam per hour to be supplied, and (iii) the amount of vapour leaving each effect, particularly in the last one.
Multiple-Effect Evaporator Design The design calculations required for a multiple-effect evaporator are complex enough to provide a real challenge for implementation using a spreadsheet program. The elements of the spreadsheet integrate much of what we have introduced in the course. To create a spreadsheet of this or greater complexity, it is
Evaporators are classified by the number of effects. In case of a single-effect evaporator, the vapor from the boiling liquor is condensed and the concentrated product is withdrawn from the bottom of the evaporator. Although the operation is simple, the device does not use steam efficiently. Typically 1.1 to 1.3 kg of steam is
Feb 19, 2004· Multiple Effect Evaporators are applied to concentrate fruit juices and other solutions. Please enjoy this animation and model to do some basic calculations: ht Multi Effect Evaporator - Chemical plant design & operations - Eng-Tips
Jul 25, 2020· The conventional multi-effect evaporation (MEE) water desalination process consists of several evaporators, a series of feedwater preheaters, a train of flashing boxes, last effect condenser, and a venting system. The evaporator is a key equipment to generate the vapor, which affects the performance of a multi-effect evaporation system.
A multiple-effect evaporator is an evaporation systems where the vapour extracted from one effect is used as heating medium for the next effect at a lower pressure. The product is heated through its recirculation in the heat exchanger to then be partially evaporated when the pressure in the flash
When a number of effects are used in series, such that the vapor coming out of one effect is used as a heating medium in the steam chest of the next effect, it is called multiple effect evaporation.
The RDG evaporator design, based on patented technologies, is ideal for multiple-effect systems, as each effect can be optimized for both vapor and fluid functional conditions to achieve optimum evaporation. This ability, together with our complete system design, allows us to lead the market for efficiency and reliability. Major Advantages of ...
3. Multiple Effect Evaporator Design Selection of type of evaporator using some parameters is presented for the best design of multiple effect evaporator in Table 1. The most of criteria in this table are selected and classifications are made by using the letters in various grades. The purpose of this tabulation is to provide a quick
How does an evaporator work? At first, the chemical compound is fed to the evaporator. It then passes across a heat source that the compound into a gaseous form (vapor). After this, the remaining part of the compound is condensed and fed into a second evaporator if it is a multi-effect evaporator system.
Optimal Temperature Selection for Energy Integrated Multiple-Effect Evaporator System. ... Effect of thermo-compression on the design and performance of falling-film multi-effect evaporator. Food and Bioproducts Processing 2015, 96 , 65-77.
MES evaporators depends essentially on the number of effects, N, according to the following relation: PR = -0.809 + 0.932 N- 0.0091 N2 (1) and Q ev can be obtained by the following equation PR L Q ev =M d (2) where M d is the rated (design) capacity and L is the latent heat of vaporization .
Single-effect evaporators are often used when the required capacity of operation is relatively small and/or the cost of steam is relatively cheap compared to the evaporator cost. However, for largecapacity operation, using more than one effect will markedly reduce steam - costs. 2. Forward-feed multiple-effect evaporators
The Multiple Effect Evaporator (MEE) 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. Because the boiling temperature of water decreases as pressure decreases, the vapor boiled off in one vessel can be used 
Multiple-effect configurations combine 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 bodyand so on for additional ...
Aug 13, 2016· Design of Triple effect evaporator used to concentrate NaOH solution from 10% to 50% NaOH. Feed be at 40000 kg/hr. Feed soln. admitted at 38 0 C. Dry saturated steam at 350 kN/m 2 is fed to the first effect taking a vacuum of 710 mm Hg at last effect.
Consequently, the temperature difference per effect decreases with an increasing number of effects. For this reason, the heating surfaces of the individual effects must be dimensioned accordingly larger to achieve the required evaporation rate but with a lower temperature difference (delta T).
The objective of this paper is to develop a mathematical model and an algorithm to design a multiple effect evaporator system. Also, it is required to make to evaluate the amount of steam saved by the use of vapour compression.
Aug 10, 2017· Design Configuration And Simulation Of A Multi Effects Evaporator For A Desalination Plant Ethar Ali, Dr. Ahmed Elzain Elhassan, Hamid M. Mustafa, Omer Hassan Abdelrhman Alyas Abstract: This ...