Two different methods are used for calculating number of effects. Multiple effect 3 evaporator steam consumption calculation. Pdf features of multieffect evaporation desalination plants. Single effect evaporators the heat requirements of a single effect continuous evaporator can be calculated by the usual methods of stoichiometry. Noniterative design of multiple effect evaporators. Hi friends, i would like to calculate the multilple 3 effect evaporator steam consumption.
The design of shell be in accordance with asme hei tema standard. Jun 03, 20 discussing and analyzing the performance of single effect evaporation process. In such a system, the heat from the original steam fed into the system is reused in. Coolant, heated from the evcabin, exchanges 2500w with the evaporatorside of the device. In a multipleeffect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. Designed for products with high levels of solid material content andor high viscosity.
Pdf detailed design of a single effect evaporator with. Using the equation for bpr for evaporator number 3 with x 0. Operating experience with vertical tube evaporators 10. This system is used in a singleeffect evaporator or in the first stage of a multipleeffect evaporator. A multipleeffect evaporator is an evaporation systems where the vapour extracted.
Outlining features of various evaporator configurations2. A multiple effect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water. Pdf design of heat integrated multiple effect evaporator. Other factors affecting heat transfer performance 5. Multiple effect evaporators maximize steam economy as vapor generated from one effect is used to drive another. Process modelling and optimization of design parameters in a. Evaporator calculations heat exchangers buffalo brewing blog.
Single effect evaporator multi effect evaporator pan evaporator naturalcirculation evaporator rising film evaporator falling film evaporator risingfalling evporator forced circulation evaporator. Farnham submittedtothedepartmentofmechanicalengineering onmay18,2014. Evaporation is an unit operation by which a solvent is evaporated from a solution by boiling the liquor in a suitable vessel and withdrawing the vapor, leaving a concentrated liquid residue. Feed 3000 kghr, feed temperature 30 degc, intial tds 5%, final tds 30%, available steam pressure for tvr 6. Multiple effect evaporators, methods of feeding, capacity and economy of multiple effect evaporators, multiple effect calculations. Pdf a simplified and generalized method to size multiple. Pp 1 5 design, modelling and simulation of multiple effect. The material and energy flow for ith effect is given in the figi. A multipleeffect evaporator is an apparatus for efficiently using the heat from steam to evaporate water.
Solid works software version 2016 and ansys workbench r15 software were used for the 3d modeling and thermal stress analysis, respectively. Dynamic simulation of multiple effect evaporators in paper. 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. In a multiple effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. Fr multiple effect evaporation linkedin slideshare. The evaporator is designed with some special features such a speci c pipe diameter and inserts. Scribd is the worlds largest social reading and publishing site. The 1 st effect of evaporator is subjected to the highest thermal and pressure loading so we selected 1 st effect with 10 m long, 45 mm dia tubes for study. Design and fabrication of evaporators for thermoadsorptive. Unesco eolss sample chapters thermal desalination processes vol. The evaporator design shall be as per tema standards or design approved by the engineer users department. The multipleeffect evaporator was invented by the africanamerican engineer norbert.
A simplified and generalized method to size multipleeffect evaporator systems with any feed scheme conference paper pdf available august 2005 with 5,144 reads how we. Hence an extensive comparison of different correlations from literature, to predict film thickness. Design configuration and simulation of a multi effects evaporator for a desalination plant ethar ali, dr. Article views are the countercompliant sum of full text article downloads since november 2008 both pdf and html across all institutions and individuals. Psychrometrics psychrometric chart example1 psychrometric chart given dbt, wbt example2 psychrometric chart given dbt, rh. The use of this system requires that steam be available at high pressure, and low. The chosen concept is a vertical plate falling lm evaporator. Thermal analysis on triple effect falling film evaporator vanitha dunna1 p. Analysis of singleeffect evaporator desalination systems combined. Design and simulation of a multiple effect evaporator. Sep 16, 2016 the single effect evaporator uses rather more than 1 kg of steam to evaporate 1 kg of water.
Finisher with two additional recompressors in series with. Thermal analysis on triple effect falling film evaporator. Solution would be rather straightforward, except that often the required thermodynamic properties are only available in tabular or graphical form. Lecture 7 evaporation universiti teknologi malaysia. The latent heat of the vapor leaving in single effect evaporator is not used but is discarded. Internship huntsman the design of falling lm evaporators. Falling film evaporation on a tube bundle with plain and. Evaporation is a special case of heat transfer to a boiling liquid.
Noniterative design of multiple effect evaporators using excel addins. It must be admitted, however, that the present method is also one of the approximate calculations, because it comprizes errors on drawing and the assumption that the heat requirement in the first effect of the n effects evaporator is 1n of that of the single effect evaporator, having the same amount of product liquor as that of the n effects. Making an overall and a solids balance to calculate the total. For this purpose, bejan 1987 established the thermodynamic design. Quadrupleeffect evaporator modified and revamped by gig karasek project schedule. Calculations on evaporators can be carried out combining mass and energy balances with the. Lecture 7 evaporation presented by muhammad abbas ahmad zaini. Online calculations for multiple effect evaporators for the sugar industry. In backward feed evaporator system the steam input is given in the first effect and the feed input is in the last effect.
The heat capacity of the liquid solution is calculated from. Fortunately, the overall approach is basically the same for the majority of problems, requiring only minor adjustments to compensate for problem quirks. Then vapour compression will be used and the live steam requirement will be calculated. A thesis on design of heat integrated multiple effect evaporator system submitted by ghoshna jyoti 210ch1201 for the partial fulfillment of master of technology under esteemed guidance of dr. The invention of the multiple effect evaporator is generally credited to norbert rillieux. Particularly in multipleeffect distillation the size of the evaporator tube bundle affects other design aspects like shell configuration, film generation, height of a stackmounted unit. 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. The tube bundle in each effect shall be horizontal and fixed to duplex tube plates by grommet. In an evaporator handling an aqueous salt solution, the overall coef. Model equations are presented foj ith effect using material and energy balance equations. From these values, u 2 for the fullscale evaporator can be calculated from equation 2. If enthalpy data or specific heat and heatofsolution data are not available, the heat requirement can be estimated as the sum of the heat needed to raise the feed from feed to product temperature and the heat required to evaporate the water. Optimization of a multiple effect evaporator system. Construction of multiple effects, in handbook of cane sugar engineering.
Multiple effect evaporator evaporation boiling free 30. A general guide to design of falling film evaporators utilized in multi effect desalination units operating at high vapor qualities under a subatmospheric condition author links open overlay panel s. Vapour flows and heat transfer areas are calculated. Detailed design of a single effect evaporator with thermal vapor re compression thesis pdf available.
Typically, multiple effect evaporator calculations require an iterative solution procedure because so many of the required properties, etc. For example, if steam is available at 220f 104c, then the last effect boiling temperature is 120f 49c. Evaporator problems require solution of the system material and energy balances with the accompanying property and heat transfer equations. Following the above steps outlined, the calculations are as follows step 1. Multiple effect 3 evaporator steam consumption calculation posted in process heat transfer. Citations are the number of other articles citing this article, calculated by crossref and updated daily. Desai page 1 study the steam economy of multiple effect evaporator plant producing sodium sulphate and its simulation a project report submitted by rohan a. This research is focused on the economic feasibility of using multi effect evaporators mev for the production of potable water, for the city of. Also the cost for compression of the steam should been. Design calculations for multipleeffect evaporators.
Feb 11, 20 tripleeffect falling film evaporator calculation posted in industrial professionals. This type of multiple effect system is perfect for continuous feed applications, as fluids are progressively reduced in each effect to final concentration discharge. In this scenario a rising film evaporator would be limited to four. A simplified and generalized method to size multipleeffect evaporator systems with any feed scheme conference paper pdf available august 2005 with 5,144 reads how we measure reads. Shabina khanam may2012 department of chemical engineering national institute of technology rourkela, orissa. Calculation of multieffect evaporator by applying enthalpy. The problems associated with a multiple effect evaporator system are that it is an energy intensive system and therefore any measure to reduce the energy consumption by reducing the steam consumption will help in improving the profitability of the plant. Design and fabrication of evaporators for thermoadsorptive batteries by taylora. A thesis on design of heat integrated multiple effect evaporator system submitted by ghoshna jyoti 210ch1201 for the partial fulfillment of master of. This evaporator has some advantages over the current evaporator.
Finally, with the use of u 2, the required area, a 2, for the fullscale. D 1,2department of mechanical engineering 1,2andhra university, visakhapatnam530026, india abstractevaporation is an operation used to remove a. Sep 29, 20 this book deals with the modeling and simulation of multiple effect evaporators. Thermodynamic design of condensers and evaporators. In the last part of the report the alternatives for the current evaporator will be discussed. International journal of scientific engineering and technology.