Other articles where multipleeffect evaporator is discussed. Evaporation is the removal of solvent as vapor from a. Understanding the needs and concerns of our customers we have been taking complete turnkey projects. Multiple effect evaporators, optimum number of effects, annual cost, evaporator cost, steam cost. Thermal analysis on triple effect falling film evaporator. In case of multiple effect evaporators, steam jet ejectors or thermocompressors are used to increase the thermal efficiency.
Optimization of multiple effect evaporators designed for fruit juice. Selecting the best evaporator for a given application can sometimes be a confusing and even intimidating task. Zero liquid discharge zld system is a combination of multiple effect evaporator and a sludge dryer for converting the concentrated waste water into solid powder. The configuration of a multiple effect system, as well as the setup of contracting methods, can optimize evaporator performance when dealing with high viscosity fluids. Simple sixeffect evaporator set steam weak black liquor product liquor condenser steam economy 5 1 234 5 6 slide 12 heat transfer in evaporators evaporation rate q ua. Evaporation outline difference between evaporation and boiling purposes of evaporation boiling point and factors that affect it determination of boiling point of a solution types of evaporators capacity. Therefore, methods of reducing steam consumption or of increasing economy, defined as mass of vapour produced per unit mass of steam consumed are very important. The theory is that if two evaporators are connected in series, the second effect can operate at a higher vacuum and therefore. Single effect evaporation is simple but fails to utilize the steam effectively, while multiple effect evaporators. The stripper is part of the multipleeffect evaporator system. 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. Design and simulation of a multipleeffect evaporator.
Abstract the main goal behind this project is to treat highly generated tds, tss, bod, etc. The heating steam is also sent through the first effect to another effect. A multiple effect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water. Optimization of a multiple effect evaporator system. In some cases multipleeffect evaporators have been converted to mvr to take advantage of changes in the relative cost of electric power and steam. 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 and steam splitting and using an optimal feed flow sequence.
Jaishree, optimization of a multiple effect evaporator system, a thesis submitted to the national institute of technology, rourkela in partial fulfillment of the requirements of bachelor of. The falling film evaporators can be single effect or multiple effects depending on the capacity. In forwarded feed multiple effect evaporator the liquid feed is pumped into the first effect and the partially concentrated solution is sent to the second effect and so on. Therefore the average area per effect of the evaporator is 232 m2. The compression ratio required is comprised of three. Singleeffect evaporators are often used when the required capacity of operation is relatively small andor the cost of steam is relatively cheap compared to the evaporator cost. With hundreds of plants already realized all over the world reda s. Evaporators with direct heating the use of solar heat for the production of glaubers salt has been described by holland22,23.
However, for largecapacity operation, using more than one effect will markedly reduce steam costs. Optimum design and operating conditions of multiple effect. Comparative analysis of multiple effect evaporators a nd anaerobic digester uasb for an effective ma nagement of ro rejec t from tannery gangarapu hareesh department. The characteristic is to heat the next effect evaporator by used steam. In such a system, the heat from the original steam fed into the system is reused in the successive effects. A computer program for simulating and evaluating multiple effect evaporators in the sugar industry by r.
Request pdf optimum design and operating conditions of multiple effect evaporators. Noniterative design of multiple effect evaporators using. Some commercial refrigeration systems have one condensing unit, associated with two or more evaporators, fig. Multi effect evaporator, multiple effect evaporator. Typically, multiple effect evaporator calculations require an iterative solution procedure because so many of the required properties, etc. Article views are the countercompliant sum of full text article downloads since november 2008 both pdf and html across all institutions and individuals. Brine is pumped in hot weather to reservoirs of 100,000 m2 in area to a. Design calculations for multipleeffect evaporators. Falling film evaporators can be operated with small temperature differences between the heating media and.
Pdf design of heat integrated multiple effect evaporator. Multiple effect evaporator is the combination of several sets single effect evaporator. The utility model discloses a multipleeffect evaporation waste water treatment system which. Pdf optimization of multiple effect evaporators designed. Pdf a simplified and generalized method to size multipleeffect. Multipleeffect evaporator chemical process britannica. Multipleeffect evaporators maximize steam economy as vapor generated from one effect is used to drive another. In this study, investigation of selection of type of evaporator using some parameters is presented for multiple effect evaporator system. In any evaporation operation, the major process cost is the steam consumed. The most common naturalcirculation tubular evaporators are horizontal tube, calandria or short vertical tube. The desiccant solution from the multiple effect evaporator is. A multiple effect evaporator consists of a set of single direction evaporators, where each effect corresponds to an evaporator.
A system and method for dehumidifying air including a multiple effect evaporator that creates a concentrated desiccant solution. An evaporator consists of either plate type or shell and tube type heat exchanger. Single effect evaporators are often used when the required capacity of operation is relatively small andor the cost of steam is relatively cheap compared to the evaporator cost. Multiple effect evaporator is used for steam economy. Company is manufacturer of multiple effect evaporation plant for waste water zero discharge from. The typical feeding method of multieffect evaporators is forward.
Mechanical vapor recompression evaporators swenson. Pdf single and multiple effect evaporators pranavv. In a multipleeffect evaporator, vapor from one body heats a second body at a lower boiling temperature. Chapter 5 multiple effect evaporators 1 multiple effect evaporator in case of a single effect evaporator, the vapor leaving the equipment are discarded. Evaporators come in many different shapes and sizes. Definition evaporation is the process used to concentrate a solution by.
The latent heat of the vapor leaving in single effect evaporator is not. Tomato paste agro industry is a very important industrial sector worldwide, especially for countries like. This type of multipleeffect system is perfect for continuous. Pdf optimization of multiple effect evaporators designed for fruit.
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