Sep 29, 1998 when used in a vapor compression distillation apparatus, the first fluid is the liquid to be distilled, and the second fluid is the compressed vapor steam. The mechanical vapor compression mvc is among the most efficient distillation processes. Analysis of a mechanical vapor compression desalination. Introduction the vapor compression distillation process can be designed as a low capital cost and corresponding low performance ratio about 7 ibs product per kbtu or as a higher capital cost and higher pr about 31 plant.
The steam generated due to evaporation of seawater is used as heating source to generate more steam. A vapor compression system in accordance with claim 1 including heat exchanger means, a distillate pump for pumping distillate from said distillate receiving vessel through said heat exchanger means to outlet, an incoming conduit passing through said heat exchanger means and communicating with said evaporator vessel to allow incoming feedwater to receive heat given up by the distillate as. Distillation distillation is a commonly used method for purifying liquids and separating mixtures of liquids into their individual components. Mechanical vapor compression distillation of saline water is a process in which mechanical energy is used as the main driving force.
Design and simulation of a vapor compression refrigeration cycle for a micro refrigerator submitted by seyfettin yildiz in partial fulfillment of the requirements for the degree of master of science in mechanical engineering department, middle east technical university by, prof. Energy conservation in ethanolwater distillation column with vapour recompression heat pump chapter pdf available march 2012 with 678 reads how we measure reads. Incoming water influent enters the system and runs through two heat exchangers which transfer heat to the influent from the outgoing pure water distillate and grey water concentrate. Vaporcompression evaporation is the evaporation method by which a blower, compressor or jet ejector is used to compress, and thus, increase the pressure of the vapor produced. Since the pressure increase of the vapor also generates an increase in the condensation temperature, the same vapor can serve as the heating medium for its mother liquid or solution being concentrated, from which the. Mechanical vapor compression aquaswiss ag the thermal. Organic liquids containing small amounts vapor compression distillation system that employs an improved water flow arrangement.
Department of chemical engineering, university of alicante. This explains the operation and working principle of a vapor compression distillation type fresh water generator. It achieves its high efficiency in a simple manner, producing a high. In the vapourcompression system, heat is provided by the compression of vapour rather than by direct heat input from a boiler. For obtaining higher energy saving efficiency, the internal heat integrated distillation column hidic fig. Vapor compression distillation vc is a process used to produce water for injection wfi on the principle of distillation, where the water is distilled with phase change and entrainment separation. The thermodynamic efficiency is derived from the application of the heat pump principle by a large volumetric flow compressor acting as the heat pump. Thermal separation processes such as evaporation and distillation are energy intensive. The mechanical vapor compression mvc desalination system is based on distillation of seawater. In 1939, meco patented the vapor compression process for the desalination of saltwater. Distillation basics the vaporization of a liquid and condensation of the resulting vapor is the basis of distillation. Pdf evaluation of a multipleeffect distillation unit under partial. 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. Pdf energy conservation in ethanolwater distillation.
The system combines the benefits of distillation with those of vapor compression to greatly lower the cost of distillation for removal of water or concentration of other ingredients. Produces purified water usp purified, highly purified water hpw and water for injection wfi in accordance with all recognized pharmacopoeias meetsexceeds the exacting standards of the pharmaceutical industry and cgmp requirements. Nasa vapor compression distillation vcd flight experiment. Desalination aims to produce potable water form seawater, brackish water, or treated waste water. Holtzapple the ability to produce potable water economically is the primary purpose of seawater desalination research. Technology and applications gea engineering for a better world. Since compression of the vapor increases both the pressure and temperature of the vapor, it is possible to use the latent heat rejected during condensation to generate additional vapor. Vapor compression distillation is a system that treats industrial process water and wastewater streams. These type of generators are used where heating source is not available. The saturated steam temperature difference results from the pressure ratio.
Vapor compression distillation fresh water generator. Fundamentals flash distillation with binary mixture continuous distillation with reflux material balance in plate column number of ideal plates reflux ratio feed tray location, minimum number plates, minimum reflux, optimum reflux ratio sieve trays, valve trays, plate efficiency condensers and reboilers batch distillation distillation in packed column multi component distillation. This new pharmaceutical vaporcompression distillation unit is capable of producing 6,000 gallons per hour for waterforinjection. Since then, weve refined and improved the technology to deliver highquality potable drinking water and distilled water in some of the worlds harshest environments. The vapor compression distillation vcd flight experiment, managed by nasa s marshall space flight center in huntsville, ala.
A new technique for recovering energy in thermally coupled distillation using vapor recompression cycles miguel a. Compressor types and compressor arrangements turbocompressor rotary fan fan 2 fans in series 3 fans in series applications of compressor types and arrangements depending on temperature difference and volume flow volume flow in m 3s. It is self sustaining and requires very less energy to produce water. Some of the compressed and heated vapour is then recycled through a series of tubes passing through. Noncondensibles removed prior to distillation corrosion reduction hot standby improved response to distillate demand elimination of biogrowth sanitary construction and connections on product contact plc based controls equipment details state of the art, gii centurbo compressor. Pharmaceutical vapor compression distillation vcd, improperly known as thermocompression or such as mechanical vapor recompression mvr or mechanical vapor compression mvc, too, is the main way to produce grade waters for pharmaceutical production environment. More precisely, vcd systems allow to obtain water for i. Technology and applications evaporation technology.
Capacity range covers single effect from 100 to and double effect units from m3day to more than 2000 m3day. It can be used for a broad range of applications and. The operation of the mechanical vapor compression vacuum evaporators is based on the recovery of the condensation heat from the distillate as a source of heat to evaporate the feed. Pdf the design of a multipleeffect distillation med system is presented, and. Distillation and steam distillation volatility ability of the substance to escape. Greater efficiency of the vapor compression system is achieved by connecting multiple evaporators in series, rather than the traditional parallel arrangement.
Comparison of lobetype and centrifugal compressors appendix glossary bibliography and suggestions for further study 1. In these systems, the process starts with the external energy supply to the evaporator to start the evaporation process. Vapor compression distillation, or vcd, is often used together with multieffect distillation for large applications or alone when used in smaller settings. Pharmaceutical vapor compression distillation vcd, improperly known as thermocompression or such as mechanical vapor recompression mvr or mechanical vapor compression mvc distillation, too, is the main way to produce wfi water for injection and grade waters for pharmaceutical use.
Us2619453a us200522a us20052250a us2619453a us 2619453 a us2619453 a us 2619453a us 200522 a us200522 a us 200522a us 20052250 a us20052250 a us 20052250a us 2619453 a us2619453 a us 2619453a authority us united states prior art keywords fluid vapors heat exchanger body plant prior art date 19460424 legal status the legal status is an assumption and is not a legal conclusion. When used in a vapor compression distillation apparatus, the first fluid is the liquid to be distilled, and the second fluid is the compressed vapor steam. Organic liquids containing small amounts vapor compression distillation vc is a process used to produce water for injection wfi on the principle of distillation, where the water is distilled with phase change and entrainment separation. Remarkably, all it takes is boiling and reliquefying water at precise temperatures. Us3956072a us05606,521 us60652175a us3956072a us 3956072 a us3956072 a us 3956072a us 60652175 a us60652175 a us 60652175a us 3956072 a us3956072 a us 3956072a authority us united states prior art keywords distillate vapor compressor conduit means liquid ring prior art date 19750821 legal status the legal status is an assumption and is not a legal conclusion. Technology and applications gea engineering for a better. Vapor compression systems are more efficient for larger applications. It describes the work performed in expert fault diagnostic development for the vapor compression distillation subsystem.
The system is basically a heat exchanger that is an evaporatorcondenser. Vaporcompression desalination vc refers to a distillation process where the evaporation of sea or saline water is obtained by the application of heat delivered by compressed vapor overview. The mechanical vapor compression mvc distillation is inherently the most thermodynamically efficient process of singlepurpose thermal desalination plants. In the vc process, the vapor produced by evaporating the water is compressed to increase the saturation pressure and temperature. Familiar examples include the distillation of crude fermentation broths into alcoholic spirits such as gin and vodka, and the fractionation of crude oil into useful products such as gasoline and heating oil. This new pharmaceutical vapor compression distillation unit is capable of producing 6,000 gallons per hour for waterforinjection. No additional heat is required, and no cooling water is needed for the heat rejection, as in other distillation processes. Vapor compression distillation subsystem vcds component enhancement, testing and expert fault diagnostics development final report volume ii by es. The process vapour compression is a distillation process, where evaporation of sea or brackish water is obtained by the application of. Process description mechanical vapor compression distillation of saline water is a process in which mechanical energy is used as the main driving force. Aquaback has optimized this preheating process to bring the. The low pr plant is designed with a maximum brine temperature of about requiring on ly a polyelectrolyte scale. Vapor compression distillation pharma vapor compressions.
Vapor compression desalination vc refers to a distillation process where the evaporation of sea or saline water is obtained by the application of heat delivered by compressed vapor. Costs of chemical processes are often dominated by separation. Vapor compression distillation numbers reference the points in the diagrams above and below 1. Since compression of the vapor increases both the pressure and temperature of the vapor, it is possible to use the latent heat rejected during condensation to. The means for creating turbulence in the flow of the second fluid may comprise from one to several foraminous screens placed between adjacent tubes in the shell, each extending across the.
Vapor compression evaporation is the evaporation method by which a blower, compressor or jet ejector is used to compress, and thus, increase the pressure of the vapor produced. All of these purifiers work by vapor compression distillation. A new technique for recovering energy in thermally coupled. The encon mvc evaporator is a forced circulation flash evaporator utilizing mechanical vapor compression. These frames from bramcor, italy, show the process steps of a vapor compression distiller, producing wfi water for injection for pharmaceutical purposes. When the vapour is rapidly compressed, its temperature rises. Other articles where vapour compression distillation is discussed. Kamen once ran down a partial list of what this process can purify. It is basically a heat pump process that pumps heat from a lowtemperature reservoir to a higher temperature reservoir, just. Technical advances, as seen in the latest vapor compression systems, allow many of todays better commercial distillation systems to produce water to 1 ppm total dissolved solids tds at a fraction of the cost of.
Us3956072a vapor distillation apparatus with two disparate. Since the pressure increase of the vapor also generates an increase in the condensation temperature, the same vapor can serve as the heating medium for its mother. Vapor compression distillation apparatus terra mannix inc. Jun 14, 2017 these frames from bramcor, italy, show the process steps of a vapor compression distiller, producing wfi water for injection for pharmaceutical purposes. Vc multi e ect distillationvapor compression desalination. Mechanical energy provides a source of thermal energy for condensation processes similar to med. Therefore, bramcor stmc vapor compression distiller vcd produces compendial. Vapour compression distillation chemical process britannica. Performance evaluation of an innovativevapor compression.
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