This improved the efficiency of the multiple effect evaporator significantly resulting in reduction of chemical oxygen demand and total dissolved solids by 91.5% and 96% respectively. I. The solution has a negligible boiling-point Mathematical models of both multiple-effect evaporators were developed for this purpose. Economy they evaporate more water per Kg steam by re-using vapours as effect evaporation is simple but fails to utilize the steam effectively, while multiple effect evaporators evaporate more quantity of water per kilogram of steam consumed in the A single-effect evaporator as shown in Fig.1 is wasteful of energy since the latent heat of the vapor leaving is not used but is discarded. 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. More details. The first effect of a multiple effect evaporator is the effect to which the raw steam is fed, vapors There are two advantages to multiple effect evaporators: a. Design, Modeling and Simulation of Multiple Effect Evaporators. Evaporators may be composed of one or more effects, where an effect is defined as one or more bodies operat-ing at the same boiling temperature. For this first trial apportion this total amount of vapor among the three effects. The first effect is heated directly with steam, and the additional bodies are ordered based RF evaporators use vertical tubes where the liquor is introduced at the bottom, the tubes are steam heated on the outside to the liquor boiling point, and partial evaporation occurs in the tubes. The computer solution to such problems can follow exactly the usual manual method, and involves solution of simultaneous equations, coupled with an iterative procedure. each effect, for a triple effect evaporator evaporating 500 kg/hr of a 10% solution up to a 30% solution. It incorporates three novel features: (a) The problem of an inherent interaction between successive evaporators In the FF evaporator, the liquor enters at the top and is distributed on a vertical heat exchange surface composed of plates or tubes. 2.1. A multiple effect evaporator is design to cut down the steam consumption by different operating strategies like feed, condensate and product flashing, vapor compression, vapor bleeding, feed stage evaporators, these evaporators can be made of up to seven evaporator stages or effects. Therefore evaporation is a very important unit operation and UNESCO EOLSS SAMPLE CHAPTERS THERMAL DESALINATION PROCESSES Vol. Calculations on evaporators can be carried out combining mass and energy balances with the principles of heat transfer. Then calculate the solids concentration in each effect by a solid balance on each effect. Possible Methods to Solve Multiple Effect Problems Several approaches can be used to solve the typical multiple effect evaporator (Usually V1 = V2 = V3 is assumed for the first trial). A multiple-effect evaporator is an evaporator system in which the vapor from one effect is used as the heating medium for a subsequent effect boiling at a lower pressure. The construction of a multiple-effect evaporator is shown in Figures using 3 evaporators, i.e. 3. Uploaded By MateCloverKoala4. In a multiple-effect evaporator, vapor from one body heats a second body at a lower boiling temperature. Different economic items, including cost of steam and cost of evaporator in addition to annual In a multiple-effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. This Paper. Figure 2. EXAMPLE 8.1. Download Download PDF. Multiple Effect Limits T across each effect further decreases as the number of . Temperature profile in single-effect and condenser arrangement. This chapter focuses on the solution of multiple effect evaporator problems. that use the backward-feed multiple-effect evaporator and the forward-feed multiple-effect evaporator in their evaporation processes are compared. Multiple-effect scheme evaporates more water per kilogram of steam fed to the unit by reusing the vapor from one effect as the heating medium for the next [2]. A short summary 2. Performance Ratio of the Single-effect Distillation System Consider the single-effect distillation (SED) Assume that the Effects can A multiple effect evaporation scheme was studied and economically analyzed. Pages 4. effect evaporation is simple but fails to utilize the steam effectively, while multiple effect evaporators evaporate more quantity of water per kilogram of steam consumed in the evaporation process. Because the boiling point of water decreases as pressure evaporation technology - for pdf.cdr 2.1. This modification has total capital investment as Rs Chapter 4 Multiple Effect Evaporation f148 Chapter 4 Multiple Effect Evaporation Objectives The main objective of this chapter is to evaluate the performance of the multiple effect Performance Ratio of the Single-effect Distillation System Consider the single-effect distillation (SED) steam in either a single evaporator or, more commonly, in multiple evaporators working in cascade, called as multi-effect evaporator. Forward-feed multiple-effect evaporators. The present models are developed for seven effect evaporator system and further, similar model is used to solve ten effect evaporator system. To check the reliability of the present study it is thought logical to compare its results with that of other investigators. By increasing the number of effects we can increase the economy of an evaporator system. EVAPORATORS Mazda Forced Circulation Evaporators are recommended for the concentration of high viscocity solutions/slurries having tendency to crystallize or produce scales. Figure 2. Each effect would consist a heat transfer surface, a vapour separator, as well as a vacuum source and a condenser. the single-effect evaporator is the economy. In a multiple-effect evaporator, water is boiled in a sequence of vessels, Temperature profile in single-effect and condenser arrangement. Multiple- effect evaporator system such as condensate, feed and product flashing, vapor bleeding, steam splitting, variable physical properties and boiling point rise are accounted to develop of different models. Design single-effect and multiple-effect evaporators Evaporation Types of evaporation equipment and operation methods Calculation methods for Single-effect evaporators Multiple-effect A single-effect evaporator is concentrating a feed solution of organic colloids from 5 to 50 wt %. dvantages Ideal for high crystallizing and high viscosity solutions & slurries Single or multiple effect operation High operational flexibility, heat transfer effects increases Only one 8-effect black liquor evaporator exists in North America Increasing number of effects from modern standard of seven is not considered to be an economically viable alternative to reduce steam consumption TRIPLE EFFECT EVAPORATOR EXAMPLE. Ray, A.K., Sharma, N. K. and Singh, P., Estimation of energy gains through modeling and simulation of multiple effect evaporator system in a paper mill, IPPTA J., Vol. 16, No. 2, pp: 35-45 (2004). 64. Ray A.K. and Singh, P., Simulation of Multiple Effect Evaporator for Black Liquor Concentration, IPPTA, Vol. 12, No.3, pp: 53-63 (2000). Two or more evaporator units can be run in sequence to produce a multiple effect evaporator. Multi effect evaporator design pdf Multiple effect evaporator control is a problem that has been widely reported in the pulp and sugar industries. 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 of feed per hour. multiple effect evaporator the vapour from one evaporator is fed into the steam chest of the other evaporator. Publications. kPa absolute. the heat transfer rate equation for each effect. Course Title CHE MISC. II Design of Multiple Effect Forced-Circulation Full PDF Package Download Full PDF Package. The Multiple Effect Evaporator (MEE) is an apparatus for efficiently using the heat from steam to evaporate water. The modified seven effect evaporator system, obtained using best model, requires four shell and tube heat exchangers and five pumps. A multiple-effect evaporator is an equipment system for efficiently using the heat from steam to evaporate water. Chapter 4 Multiple Effect Evaporation @inproceedings{ElDessouky2002Chapter4, title={Chapter 4 Multiple Effect Evaporation}, author={Hisham El-Dessouky and Hisham Ettouney}, year={2002} } H. El-Dessouky, H. Ettouney; Published 2002; Engineering Download & View Multiple Effect Evaporator as PDF for free. multiple effect evaporator.pdf - Problem on Multiple Effect School Institute of Technology Banaras Hindu University. The other aspects of the construction of the vertical Make a total mass balance on effects 1, 2, 3 to obtain L1, L2, and L3. In such a system, the heat from the original steam fed into the system is In this paper, the development of a control system for a 3-effect evaporator is presented. triple effect evaporator. Adding one evaporator to the single effect decreases the energy consumption to
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