A mechanical vapor recompression evaporator system is similar to a conventional steam heated, singleeffect evaporator, except that the vapor released from the boiling solution is compressed in a mechanical compressor. The energy savings possible by using mvr technology is significant. Evaporation of acid mine water with mechanical vapor. Mechanical vapor recompression mvr is used to drive the evaporation process in a zld system when an external steam supply is not available. Mechanical vapor recompression for the treatment of shalegas. A molasses desugarization facility has the requirement to concentrate multiple waterbased streams. To reduce energy consumption, water vapor from an evaporator is entrained and compressed with high pressure steam in a thermocompressor so it can be condensed in the evaporator heat exchanger. Instead of live steam, electric energy is used indi rectly to heat the plant. Mechanical vapour recompression reduces the energy costs and the co 2oot f. Whereas steam jet compressors only compress part of the vapor, mechanical vapor recompressors recycle all of the vapor leaving the evaporator. Hysys flowsheet for mechanical vapor recompression with compressor inlet preheating. Mvr heated evaporation plants gea engineering for a. Appropriate placement of vapour recompression in ultralow. Technology and applications evaporation technology using mechanical vapour recompression engineering for a better world.
In principle, both technologies distill water in a similar overall process but differ in how increases to steam pressure and temperatures are applied. Compared to multipleeffect evaporators, mvr evaporators consume considerably less energy. Mechanical recompression is not limited to singleeffect evaporation. Mechanical vapor recompression evaporators swenson technology. In reality air is circulated through the system by the vaccum pump until operating temperature is reached. Mechanical vapor recompression mvr plants typical mvr evaporators with fan type recompressor 2features. This paper proposed a novel integrated design of azeotropic mixtures distillation process based on mechanical vapor recompression mvr. Piller has therefore developed high performance blowers that achieve a temperature increase of up to 10 kelvin in a single stage. Mechanical vapor recompression mvr evaporation process.
Vacuum evaporator with mechanical vapor recompression. Mechanical vapor recompression evaporation products finishing. Pacific gas and electric company emerging technologies program mvr creamery energy analysis base 1 1. Evaporator with large surface up to even 6000 m, dt heating to process side 45 k, tube length up to 26 ms, high efficiency in heat recovery between inlet and outlet liquors, evaporator with multiple liquid passes. The mechanical vapor compression process is a highly energy efficient and cost effective way of retaining and reusing the latent heat contained in the vapor. As has been normal for these facilities, an evaporator is the preferred system for. As energy costs increase, the use of mechanical vapor recompression mvr evaporators has also increased. With tvr, steam jet ejectors are used to raise the. The mechanical vapor recompression mvr evaporation process is an energyefficient alternative method for neutralizing and precipitation of the metals, which are most often performed by chemical neutralization and precipitation. Piller was the first company to introduce centrifugal blower solutions for the process of mechanical vapor recompression. In the following years, its areas of application were expanded, and now include the dairy industry, brewing industry, sugar industry, saline industry, pulp industry, chemical industry, alcohol industry etc. Thermal vapor recompression tvr tvr can be used on a single effect evaporator to increase the steam economy or in conjunction with a multiple effect design to further enhance the systems steam economy. Makeup water is used in our cooling towers to cool the ethanol processes finished ethanol is assigned rins numbers and transported to gasoline terminals for blending. Mechanical vapor compression an overview sciencedirect.
The recompressed vapor condenses and releases its latent heat through the heat transfer surface for further evaporation of the liquor or effluent. Stream data for configuration 3 configuration 3 pressure bar temperature 0c 1 19 47. Use vapor recompression to recover lowpressure waste steam. Technology and applications gea engineering for a better. Analysis of a mechanical vapor compression desalination. They have no moving parts and are therefore not subject to wear and tear. This in turn entrains recycled vapor and discharges it at an intermediate pressure while providing a steam rate reduction. After the fan, vapor can be used as heating steam in the same unit. The vapor compression devices include mechanical compressors, steam jet ejectors which is known as thermal vapor compression, adsorptiondesorption beds, and absorptiondesorption columns. Efficiency through flexibility piller mvr blowers ensure maximum efficiency, thus cost savings, and lower life cycle costs. Multieffect evaporation coupled with mvr heat pump. Started in 1977 we were based in continuous purification technologies. Mechanical vapour recompression incorporated to the ethanol production from sugarcane and thermal integration to the overall process applying pinch analysis. Vapor compression evaporators vces provide continuous evaporation by mechanically compressing the vapor produced by the system, and then feeding it back to the lamella package as the heating source.
The ejector is usually designed for specific working points and works on a jet pump principle. Mechanical vapor recompression was initially used almost exclusively in the dairy industry. Pdf vapour recompression is a means of upgrading energy by the compressing of a lower pressure vapour up to a higher pressure, thus making the energy. Maa abstract hysys process modeling software was used to analyze the e. Leheng mechanical vapor recompressionmvr evaporator. Nov 17, 2014 this paper presents a comprehensive design model of singleeffect mechanical vapor recompression mvr system. Performance of thermal vapor compression request pdf. Analysis and modeling of vapor recompressive distillation using aspenhysys cinthujaa c. Thermal vapor recompression tvr evaporator swenson technology.
Mechanical vapor recompression mvr compressor increases. Mechanical vapor compression mvc mechanical vapor recompression mvr solutions are low operating cost ways to reduce your vapour consumption. As the heat load is high and the temperature difference between the overhead and bottom of the column or conserving energy 17. The system is basically a heat exchanger that is an evaporatorcondenser. It is basically a heat pump process that pumps heat from a lowtemperature reservoir to a higher temperature reservoir, just. Pdf application of mechanical vapor recompression to. Andritz mechanical vapor recompression mvr evaporator. Evaporation technology tvr heated evaporation plants. Mechanical vapor recompression dedert originally introduced mechanical vapor recompression to the corn wet milling industry decades ago. Pdf this paper proposed a novel integrated design of azeotropic mixtures distillation process based on mechanical vapor recompression.
Mechanical vapor recompression evaporation mvre is underutilized in the treatment of industrial wastewaters that are typical of metal fabricating and finishing industries. In the course of their development, the aim of efficiently using this. I dont know how to start up the process to reach steady state. The analysis focuses on the prediction of the specific power consumption of the compressor and the heat transfer areas of the evaporator. The applicability of the mvr evaporation process was studied with pilot e vaporation experiments for acid mine. During mechanical vapour recompression, the vapor generated from an evaporator is recompressed to a higher pressure by means of a mechanically driven compressor. The mvr system has three stages of evaporation, all operated at about 180 of. Thermal vapour recompression principle a part of the vapour steam is compressed to a higher pressure and temperature level by a steam jet pump with steam, so that it can be used as a heating medium. The saturated steam temperature corresponding to the heating chamber pressure is higher so that the vapor can be reused for heating. Dec 17, 2012 mechanical vapor recompression evaporation mvre has been used in the manufacturing industry for decades for such purposes as desalinating sea water, concentrating juices and treating wastewater on large industrial scales. Recovering energy by mechanical vapor recompression. Typically, the compressed v apor is fed back to help heat the mother liquor in order to produ ce more v apor or steam. Caloris concentrix mvr evaporator compact evaporator. It looks nice in theory but i wondered if anyone had experience with installation and operation of such equipment.
Industrial vapor compression solution centrifugal steam compressor is the core component of mvr mechanical vapor recompression system. Vapor recompression relies upon a mechanical compressor or steam jet ejector to increase the temperature of the latent heat in steam to render it usable for process duties. Process description mechanical vapor compression distillation of saline water is a process in which mechanical energy is used as the main driving force. Actual application of mechanical vapor recompression evaporation. These evaporator components are similar to steam driven systems, but with the addition of a mechanical compressor. An evaluation and redesign of a thermal compression evaporator a thesis submitted to the graduate faculty of the university of new orleans in partial fulfillment of the requirements for the degree of master of science in mechanical engineering thermal sciences by benjamin marc day, p. Dedert originally introduced mechanical vapor recompression to the corn wet milling industry over 4 decades ago. Vapor bodies use the swenson verticalinlet baffle design, which has proven to be effective in minimizing shortcircuiting. However the benefit of mvr has only been studied for a single distillation column.
Im investigating the possibility to take 1025tonshour of 25 psig steam and recompress it to 140psig. Pdf application of mechanical vapor recompression to acetone. Aug 17, 2010 steam recompression posted in industrial professionals. In this application of mechanical vapor recompression to. To this end, steam jet vapor recompressors are used. The mechanical vapor compression mvc distillation is inherently the most thermodynamically efficient process of singlepurpose thermal desalination plants.
The concentrix mvr is a highefficiency falling film evaporator system using proprietary turbofan technology for heating by mechanical vapor recompression mvr, driving the evaporation process with electrical power. Mechanical recompression works best in a system with low boiling point elevation and where larger heat transfer surfaces can be used to lower the differential temperatures in the heat exchanger. By using this design, the encon mvc evaporator allows for minimal scaling, maximum uptime, and low operating costs. Distillation still bottoms are then recycled with a mechanical vapor recompression evaporator into distilled water in our mechanical vapor recompression evaporator. Economics and product characteristics determine the suitability of thermal vapor recompression operation. Snowpurestarted the worlds first edi technology research and development, and our edi technology products now have nearly 40 years of development. Over the past 1015 years, mechanical vapor recompression mvr has become the preferred system in many industrial evaporation and crystallization applications, because of its economy and simplicity of operation. Typically, the compressed vapor is fed back to help heat the mother liquor in order to produce more vapor or steam. Otsg generally ran on natural gas which in 2008 had become increasingly valuable. Us6375803b1 mechanical vapor recompression separation.
Vapor recompression in vapor recompression arrangement the heat of condensa tion of the evaporated vapor is recovered in single effect only by raising the pressure and temperature of the gener ated vapor and then their condensation in the same evaporator. During that time, the technology has evolved somewhat, specifically in europe where water and energy conservation are more. Mechanical vapor recompression evaporation products. Pdf mechanical vapour recompression incorporated to the. Thermal vapor compression in thermal vapor recompression steam jet ejectors are used to raise the pressure and temperature of the generated vapors. To this end, vapours are absorbed by an ejector and the vapours recompress up to a higher pressure. Technology and applications gea engineering for a better world.
Use vapor recompression to recover lowpressure waste. The vapor compression can be done by ther mal vapor compression or mechanical vapor. Appropriate placement of vapour recompression in ultralow energy industrial milk evaporation systems using pinch analysis timothy g. Analysis of a mechanical vapor recompression wastewater. Thermal vapor recompression tvr evaporator swenson. We use cookies to give you the best online experience. Mechanical vapor recompression mvr buy from mechanical vapor recompression mvr for your industrial processes, like distillation and evaporation. In the following years, its areas of application were expanded, and now include the dairy industry, brewing industry, sugar industry, saline industry, pulp.
Andritz mvr evaporators are designed to operate with very low specific energy consumption while producing clean condensate to minimize fresh water consumption in the mill. However, the research about salt sodium chloride and sodium sulfate containing methanol wastewater on evaporation coupled with distillation process is. Evaporation is a process where water is removed from a feed stream to produce a concentrated discharge stream and a separate water stream. Mechanical vapor recompression evaporators swenson. The water quality of evaporators is four times better which is needed for the drum boilers. Technical problems with compression units in mechanical vapour recompression systems article pdf available january 2018 with 242 reads how we measure reads. Home mechanical vapor recompression vacuum evaporators introduction to technology a mechanical vapor recompression vacuum evaporator is designed for the efficient treatment of industrial waste effluent from production processes and water treatment plant reject fractions brine with a low energy cost. Evaporators with thermal vapour recompression technology use a part of the vapours to heat the unit. It is sometimes economical to compress vapor from the last effect of a double or tripleeffect evaporator so that the vapor can be condensed in the firsteffect heat exchanger. Devon energy has supported the operation of an advanced mvr system at a northcentral texas barnett shale region treatment facility.
This effectively reduces steam con sumption in proportion to the number ofeffects. Analysis and modeling of vapor recompressive distillation. Robertson, kevin, leader and southern experimental steam, alan sutton. Mvc evaporator mechanical vapor recompression evaporators. Mvr blowers are usefully employed in all processes that require temperature rise delta t of 5 to 10 kelvin.
Patented bearings and purposely developed highperformance impellers make piller the leading manufacturer of mvr blowers. Increasing energy costs, rapidly decreasing freshwater resources, and growing sensitivity towards the environmental impact of industrial management practices are the driving forces in the. I read some articles on steam compression to upgrade quality pressuretemperaturewith dollar savings calculations. Mechanical vapor recompression mvr manufacturer,mechanical. As the key component of the mvr system, steam compressor can improve the enthalpy of the secondary steam by compression of the secondary steam. Mechanical vapor recompression low complexity high houghtons value proposition is based on product technology and application expertise we provide a complete total solutions capability using a combination of innovative products and services which provides our customers with both operational and process improvements which in. They operate according to the steam jet pump principle. The vapor is recompressed to the pressure of the corresponding heating steam temperature of the evaporator, using a mere fraction of electrical energy relative to the enthalpy recovered in the vapor.
The apparatus includes a unique configuration of a vapor compressor, heated separator in combination with a forced circulation 42,44,38 circuit to generate the decontamination result. Typical mvr evaporators with fan type recompressor. Steam recompression industrial professionals cheresources. Mechanical vapor recompression for the treatment of shale. The encon mvc evaporator is a forced circulation flash evaporator utilizing mechanical vapor compression. The process followed in this equipment is called an energy recovery process, as it condenses energy from a lowpressure vapor by the way of compression. Vapor recompression relies upon a mechanical compressor or steam jet ejector to increase the temperature of the latent heat in steam to render it usable for.
Recompression typically requires only 5% to 10% of the energy required to raise an. Leheng mechanical vapor recompressionmvr technology. Mvc evaporator process description principles of operation. This helps reduce downtime and increases the production. The authors focused their attention on machine issues mainly. Our extensive experience and expertise has been leveraged into many industries, such as food and chemical and in later years, the fuel alcohol market. Mechanical vapor recompres sion mvr is an energy recovery process which can be used to recycle waste heat to improve efficiency. Application of mechanical vapor recompression to acetone. Use vapor recompression to recover lowpressure waste steam lowpressure steam exhaust from industrial operations such as evaporators or cookers is usually vented to the atmosphere or condensed in a cooling tower. Objective of study the specific objective of the study was to analyze the energy consumption of the mechanical vapor recompression mvr milk evaporation system at humboldt creamery. The first installation is a lowtemperature vapour recompression system, whereas the second is a hightemperature from an industrial viewpoint installation. Tvr uses highpressure steam in conjunction with process vapor to drive the evaporation process. It is basically a heat pump process that pumps heat from a lowtemperature reservoir to a higher temperature reservoir, just as in household refrigerators where the heat is pumped from the air inside the.
The vapor compression evaporation process replaced the oncethrough steam generators otsg traditionally used for steam production. The thermodynamic efficiency is derived from the application of the heat pump principle by a large volumetric flow compressor acting as the heat pump. Neale university of waikato, energy research centre, school of. The extractive distillation of acetone methanol binary system that forms a homogeneous minimum boiling. The brine and vapor flow rates among the effects are calculated based on the liquid level and the saturation pressure in each effect. Mechanical vapor recompression evaporation mvre has been used in the manufacturing industry for decades for such purposes as desalinating sea water, concentrating juices and treating wastewater on large industrial scales. Actual application of mechanical vapor recompression. Mechanical vapor recompression mvr is an energy recovery process which can be used to. Mechanical vapor compression aquaswiss ag the thermal. Vapor compression or mechanical vapor compression process. Swenson thermal vapor recompression tvr evaporators use a thermocompressor to reduce the steam required per pound of evaporation. Leheng mechanical vapor recompression mvr evaporator.
Since vapor recompression often includes water injection to help keep the working fluid saturated for condensation and to generate heat waste into energy for reuse, purestream needed a blower that can withstand a corrosive environment. On average, the tomato paste brix number was increased from 7. The motive steam mixes with the vapor and to maintain the steady flow heat balance some of the vapor steam mixture has to be. It use the centrifugal compressor to recompress the secondary vapor low temperature and low pressure which is evaporated from the liquid material to rise its temperature and pressure, so as to reuse it as heating source to evaporate the liquid material again. The heat required to evaporate water which flows on one side of a heat transfer surface is supplied through the simultaneous condensation of the distillateproducing vapor on. The encon mechanical vapor recompression mvr evaporation process involves our forced circulation flash evaporator utilizing mechanical vapor compression. And application expertise with an investment range to meet. Mechanical vapor compression aquaswiss mechanical vapor compression mvc distillation is the most thermodynamically efficient process of singlepurpose thermal desalination. Mechanical vapor recompression blower and compressor. Leheng mechanical vapor recompression mvr technology. Simultaneously, other plant operations may require intermediatepressure steam at 20 to 50 pounds per square inch gauge psig. The mechanical vapor compression mvc desalination system is based on distillation of seawater.
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