Jun 03, 20 discussing and analyzing the performance of single effect evaporation process. Psychrometrics psychrometric chart example1 psychrometric chart given dbt, wbt example2 psychrometric chart given dbt, rh. Pp 1 5 design, modelling and simulation of multiple effect. Lecture 7 evaporation universiti teknologi malaysia. Single effect evaporator multi effect evaporator pan evaporator naturalcirculation evaporator rising film evaporator falling film evaporator risingfalling evporator forced circulation evaporator. Process modelling and optimization of design parameters in a.
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. Detailed design of a single effect evaporator with thermal vapor re compression thesis pdf available. Scribd is the worlds largest social reading and publishing site. Model equations are presented foj ith effect using material and energy balance equations. Solid works software version 2016 and ansys workbench r15 software were used for the 3d modeling and thermal stress analysis, respectively. Pdf a simplified and generalized method to size multiple. Shabina khanam may2012 department of chemical engineering national institute of technology rourkela, orissa. The design of shell be in accordance with asme hei tema standard. Pdf features of multieffect evaporation desalination plants. 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. Finally, with the use of u 2, the required area, a 2, for the fullscale.
Multiple effect 3 evaporator steam consumption calculation. Following the above steps outlined, the calculations are as follows step 1. The chosen concept is a vertical plate falling lm evaporator. Feb 11, 20 tripleeffect falling film evaporator calculation posted in industrial professionals. Pdf detailed design of a single effect evaporator with. The evaporator is designed with some special features such a speci c pipe diameter and inserts.
The material and energy flow for ith effect is given in the figi. 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. Ntu or lmtd approaches can address the heat transfer pumping power tradeoffs, which is the crux of a balanced heat exchanger design. Typically, multiple effect evaporator calculations require an iterative solution procedure because so many of the required properties, etc. This type of multiple effect system is perfect for continuous feed applications, as fluids are progressively reduced in each effect to final concentration discharge. The use of this system requires that steam be available at high pressure, and low. In an evaporator handling an aqueous salt solution, the overall coef. Outlining features of various evaporator configurations2. Operating experience with vertical tube evaporators 10.
From these values, u 2 for the fullscale evaporator can be calculated from equation 2. Hi friends, i would like to calculate the multilple 3 effect evaporator steam consumption. Thermodynamic design of condensers and evaporators. Noniterative design of multiple effect evaporators using excel addins. 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.
In a multiple effect 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. International journal of scientific engineering and technology. Finisher with two additional recompressors in series with. Multiple effect 3 evaporator steam consumption calculation posted in process heat transfer. Internship huntsman the design of falling lm evaporators. Analysis of singleeffect evaporator desalination systems combined. 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. Pdf design of heat integrated multiple effect evaporator. Lecture 7 evaporation presented by muhammad abbas ahmad zaini. This research is focused on the economic feasibility of using multi effect evaporators mev for the production of potable water, for the city of.
Thermal analysis on triple effect falling film evaporator vanitha dunna1 p. Fr multiple effect evaporation linkedin slideshare. Calculation of multieffect evaporator by applying enthalpy. A general guide to design of falling film evaporators. Construction of multiple effects, in handbook of cane sugar engineering. 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. In backward feed evaporator system the steam input is given in the first effect and the feed input is in the last effect.
Feed 3000 kghr, feed temperature 30 degc, intial tds 5%, final tds 30%, available steam pressure for tvr 6. This evaporator has some advantages over the current evaporator. Citations are the number of other articles citing this article, calculated by crossref and updated daily. Design and fabrication of evaporators for thermoadsorptive batteries by taylora.
Other factors affecting heat transfer performance 5. Unesco eolss sample chapters thermal desalination processes vol. Evaporator calculations heat exchangers buffalo brewing blog. Take standard vertical short tube evaporator calendria type data. Fortunately, the overall approach is basically the same for the majority of problems, requiring only minor adjustments to compensate for problem quirks. Design calculations for multipleeffect evaporators. A multipleeffect evaporator is an apparatus for efficiently using the heat from steam to evaporate water. Solution would be rather straightforward, except that often the required thermodynamic properties are only available in tabular or graphical form. In such a system, the heat from the original steam fed into the system is reused in.
Using the equation for bpr for evaporator number 3 with x 0. Calculations on evaporators can be carried out combining mass and energy balances with the. The multipleeffect evaporator was invented by the africanamerican engineer norbert. The evaporator design shall be as per tema standards or design approved by the engineer users department. 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. Multiple effect evaporator evaporation boiling free 30. Also the cost for compression of the steam should been. Making an overall and a solids balance to calculate the total. 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. Falling film evaporation on a tube bundle with plain and.
Evaporator problems require solution of the system material and energy balances with the accompanying property and heat transfer equations. Design and simulation of a multiple effect evaporator. 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. Optimization of a multiple effect evaporator system. Two different methods are used for calculating number of effects. The heat capacity of the liquid solution is calculated from. Design and fabrication of evaporators for thermoadsorptive. 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 configuration and simulation of a multi effects evaporator for a desalination plant ethar ali, dr. The invention of the multiple effect evaporator is generally credited to norbert rillieux.
These metrics are regularly updated to reflect usage leading up to the last few days. D 1,2department of mechanical engineering 1,2andhra university, visakhapatnam530026, india abstractevaporation is an operation used to remove a. Thermal analysis on triple effect falling film evaporator. The latent heat of the vapor leaving in single effect evaporator is not used but is discarded. Hence an extensive comparison of different correlations from literature, to predict film thickness. For this purpose, bejan 1987 established the thermodynamic design. In the last part of the report the alternatives for the current evaporator will be discussed. Single effect evaporators the heat requirements of a single effect continuous evaporator can be calculated by the usual methods of stoichiometry. Quadrupleeffect evaporator modified and revamped by gig karasek project schedule.
Multiple effect evaporators, methods of feeding, capacity and economy of multiple effect evaporators, multiple effect calculations. Online calculations for multiple effect evaporators for the sugar industry. 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. Then vapour compression will be used and the live steam requirement will be calculated. Evaporation is a special case of heat transfer to a boiling liquid. Mar 04, 2014 international journal of scientific engineering and technology. Article views are the countercompliant sum of full text article downloads since november 2008 both pdf and html across all institutions and individuals. This system is used in a singleeffect evaporator or in the first stage of a multipleeffect evaporator. For example, if steam is available at 220f 104c, then the last effect boiling temperature is 120f 49c. Vapour flows and heat transfer areas are calculated.
In a multipleeffect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. The tube bundle in each effect shall be horizontal and fixed to duplex tube plates by grommet. Coolant, heated from the evcabin, exchanges 2500w with the evaporatorside of the device. 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.
Multiple effect evaporators maximize steam economy as vapor generated from one effect is used to drive another. 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. A multiple effect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water. Farnham submittedtothedepartmentofmechanicalengineering onmay18,2014. Sep 16, 2016 the single effect evaporator uses rather more than 1 kg of steam to evaporate 1 kg of water. Noniterative design of multiple effect evaporators. Dynamic simulation of multiple effect evaporators in paper. In this scenario a rising film evaporator would be limited to four. A thesis on design of heat integrated multiple effect evaporator system submitted by ghoshna jyoti 210ch1201 for the partial fulfillment of master of. Sep 29, 20 this book deals with the modeling and simulation of multiple effect evaporators. A multipleeffect evaporator is an evaporation systems where the vapour extracted.
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