Optimum design and operating conditions of multiple effect. A multiple effect evaporator consists of a set of single direction evaporators, where each effect corresponds to an evaporator. The desiccant solution from the multiple effect evaporator is. The utility model discloses a multipleeffect evaporation waste water treatment system which. Pdf design of heat integrated multiple effect evaporator. Mechanical vapor recompression evaporators swenson.
Noniterative design of multiple effect evaporators using. 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. In such a system, the heat from the original steam fed into the system is reused in the successive effects. The compression ratio required is comprised of three. Evaporation is the removal of solvent as vapor from a. Multiple effect evaporator is the combination of several sets single effect evaporator. 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. The amount of steam consumption in multiple effect evaporators is already mentioned in lesson 4. 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. Pdf optimization of multiple effect evaporators designed for fruit. 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.
Multiple effect evaporators, optimum number of effects, annual cost, evaporator cost, steam cost. A computer program for simulating and evaluating multiple effect evaporators in the sugar industry by r. The latent heat of the vapor leaving in single effect evaporator is not. In some cases multipleeffect evaporators have been converted to mvr to take advantage of changes in the relative cost of electric power and steam. Selecting the best evaporator for a given application can sometimes be a confusing and even intimidating task. The heating steam is also sent through the first effect to another effect. A multipleeffect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water. The results indicated that minimum annual total cost is obtained by using a double effect evaporator. Single effect evaporation is simple but fails to utilize the steam effectively, while multiple effect evaporators.
Multipleeffect evaporator chemical process britannica. Pdf optimization of multiple effect evaporators designed. 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. Optimization of a multiple effect evaporator system. Chapter 5 multiple effect evaporators 1 multiple effect evaporator in case of a single effect evaporator, the vapor leaving the equipment are discarded. Abstract the main goal behind this project is to treat highly generated tds, tss, bod, etc. Pdf a simplified and generalized method to size multipleeffect. Design calculations for multipleeffect evaporators. 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.
Article views are the countercompliant sum of full text article downloads since november 2008 both pdf and html across all institutions and individuals. Multi effect evaporator, multiple effect evaporator. 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. A system and method for dehumidifying air including a multiple effect evaporator that creates a concentrated desiccant solution.
The theory is that if two evaporators are connected in series, the second effect can operate at a higher vacuum and therefore. The characteristic is to heat the next effect evaporator by used steam. With hundreds of plants already realized all over the world reda s. 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. Multiple effect evaporator is used for steam economy.
Multi effect evaporator multiple effect evaporation remains one of the popular methods used for the concentration of aqueous solutions. Therefore the average area per effect of the evaporator is 232 m2. Thermal analysis on triple effect falling film evaporator. Other articles where multipleeffect evaporator is discussed. The single effect evaporator uses rather more than 1 kg of steam to evaporate 1 kg of water. Request pdf optimum design and operating conditions of multiple effect evaporators. Company is manufacturer of multiple effect evaporation plant for waste water zero discharge from. In this study, investigation of selection of type of evaporator using some parameters is presented for multiple effect evaporator system. Falling film evaporators can be operated with small temperature differences between the heating media and. The falling film evaporators can be single effect or multiple effects depending on the capacity. This type of multipleeffect system is perfect for continuous. Pdf single and multiple effect evaporators pranavv. In case of multiple effect evaporators, steam jet ejectors or thermocompressors are used to increase the thermal efficiency. Typically, multiple effect evaporator calculations require an iterative solution procedure because so many of the required properties, etc.
The typical feeding method of multieffect evaporators is forward. However, for largecapacity operation, using more than one effect will markedly reduce steam costs. 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. 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. Manufacturer of waste water effluent evaporation system with atfd for complete zero discharge. 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. Design and simulation of a multipleeffect evaporator. Multiple effect evporators filed april 15, 1 957 4 sheetssheet 4 ff.
Hoekstra huletts sugar limited, operations research department. Optimization of multiple effect evaporators designed for fruit juice. Multipleeffect evaporators maximize steam economy as vapor generated from one effect is used to drive another. Understanding the needs and concerns of our customers we have been taking complete turnkey projects. An evaporator consists of either plate type or shell and tube type heat exchanger. Some commercial refrigeration systems have one condensing unit, associated with two or more evaporators, fig. Evaporators come in many different shapes and sizes.
Evaporators with direct heating the use of solar heat for the production of glaubers salt has been described by holland22,23. A multiple effect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water. The stripper is part of the multipleeffect evaporator system. Brine is pumped in hot weather to reservoirs of 100,000 m2 in area to a. In any evaporation operation, the major process cost is the steam consumed. Tomato paste agro industry is a very important industrial sector worldwide, especially for countries like.
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