· Evaporator Material and Energy Balance • If the heat content of the steam was used only once 100 000 lbs of steam would evaporate only 100 000 lbs of water from the liquor • Venting radiation and other losses prevent attaining theoretical efficiency Slide 8 Single Effect Operation 116k lb/hr steam 150k lb/hr WBL 15 TS 45k lb/hr SBL 50 TS
Process design of a forward-feed triple effect evaporator system (Figure 1) for the process data given in section-2 1. Perform material balance to find liquid and vapor flow rates in each effect. 2. Find boiling point elevation in each effect. 3. Perform energy balance to calculate solution temperature and steam flowrate in each effect. 4.
· Simplified diagram of backward-feed triple-effect evaporator. • However liquid pumps must be used in each effect since the flow is from low to high pressure. • This reverse-feed method is also used when theconcentrated product is highly viscous.
Process design of a forward-feed triple effect evaporator system (Figure 1) for the process data given in section-2 1. Perform material balance to find liquid and vapor flow rates in each effect. 2. Find boiling point elevation in each effect. 3. Perform energy balance to calculate solution temperature and steam flowrate in each effect. 4.
LearnChemE features faculty prepared engineering education resources for students and instructors produced by the Department of Chemical and Biological Engineering at the University of Colorado Boulder and funded by the National Science Foundation Shell and the Engineering Excellence Fund.
· 2. Single-effect Submerged Tube System A single-effect submerged tube system which is shown in Figure 1 was the first and simplest method used to desalt seawater in large quantities. In this method the evaporator has one or two horizontal (or vertical) tube bundles representing the heating surface and contained in the lower part of a shell.
· Evaporator Material and Energy Balance • If the heat content of the steam was used only once 100 000 lbs of steam would evaporate only 100 000 lbs of water from the liquor • Venting radiation and other losses prevent attaining theoretical efficiency Slide 8 Single Effect Operation 116k lb/hr steam 150k lb/hr WBL 15 TS 45k lb/hr SBL 50 TS
performance evaluation of a triple-effect evaporator 469 Szargut J Morris DR Stewart FR. 1988. Exergy Analysis of Thermal Chemical and Metallurgical Processes .
LearnChemE features faculty prepared engineering education resources for students and instructors produced by the Department of Chemical and Biological Engineering at the University of Colorado Boulder and funded by the National Science Foundation Shell and the Engineering Excellence Fund.
· 6.1.3 Triple Effect Evaporator Steady-state Model Figure 11 Flow diagram of double effect evaporator (Ramli 2016)..17 Figure 12 Flowchart of the method taken place in the research..19 Figure 13 Collection of data from double effect of evaporator in ACM
· Each effect in itself act as a single effect evaporator and each has a temperature drop across its heating surface corresponding to the pressure drop in that effect. Forward-feed multipleeffect evaporator . A simplified diagram of a forward-feed triple- effect evaporation system is shown in Fig.
· A model was developed with Pro II to simulate a triple multi-effect evaporator of sugarcane juice. VLE of sucrose-water dextrose-water and fructose-water was included in the model being useful to estimate the sucrose inversion rate in each effect based on the data obtained from qualified references. 1.1 Pinch Analysis
Double and Triple Effect Evaporators Powered by Hot Water or Steam Larger versions of the above evaporator are available with two or three evaporation stages. The processing capacity of these bigger machines ranges from 12 000144 000 l/day for the double chamber evaporator and 18 000216 000 l/day for the triple.
Double and Triple Effect Evaporators Powered by Hot Water or Steam Larger versions of the above evaporator are available with two or three evaporation stages. The processing capacity of these bigger machines ranges from 12 000144 000 l/day for the double chamber evaporator and 18 000216 000 l/day for the triple.
· ) in the double and triple effect cycles are taken as 80 90 and 100 oC while in the high pressure condenser (T c1) of the triple effect cycle are 150 160 and 170 oC. II. SYSTEM DESCRIPTION Figure 1 shows schematic diagram of Triple Effect vapour absorption system and its process on P-T-X diagram in Fig. 2.
Question 2) A Triple Effect Evaporator With Forward Feed Is Evaporating A Solution With Negligible Boiling Point Rise And Containing 5 Wt Solids (entering The First Effect) To 50 Wt (leaving The Third Effect). The Solution At 30 °C And 1 Atm Enters The First Effect At A Rate Of 5400 Kg/h. Saturated Steam At 120 KPa Is Fed Into A Tube Bundle In The Ist Effect.
· The boiling temperatures decrease from effect to effect. This means that if the first effect is at P 1 = 1 atm abs pressure the last pressure P 3. The concept of an overall heat-transfer coefficient is used in the calculation of the rate of heat transfer in an evaporator. Figure 1.2. Simplified diagram of forward-feed triple-effect evaporator.
· 6.1.3 Triple Effect Evaporator Steady-state Model Figure 11 Flow diagram of double effect evaporator (Ramli 2016)..17 Figure 12 Flowchart of the method taken place in the research..19 Figure 13 Collection of data from double effect of evaporator in ACM
· Fig.3.1. Schematic diagram of triple-effect backward feed evaporator 29 Fig.3.2. Schematic diagram of five-effect forward feed evaporator 30 Fig.4.1. Block diagram of a single effect in a multiple-effect evaporator 31 Fig.4.2.
Question 2) A Triple Effect Evaporator With Forward Feed Is Evaporating A Solution With Negligible Boiling Point Rise And Containing 5 Wt Solids (entering The First Effect) To 50 Wt (leaving The Third Effect). The Solution At 30 °C And 1 Atm Enters The First Effect At A Rate Of 5400 Kg/h. Saturated Steam At 120 KPa Is Fed Into A Tube Bundle In The Ist Effect.
· Design of Triple effect evaporator used to concentrate NaOH solution from 10 to 50 NaOH. Feed be at 40000 kg/hr. Feed soln. admitted at 38 0 C. Dry saturated steam at 350 kN/m 2 is fed to the first effect taking a vacuum of 710 mm Hg at last effect.
A triple effect forwardfeed evaporator is being used to evaporate a milk containing 10 solids to a condensed milk of 50 T.S. The boiling point rise of the milk (independent of pressure) can be estimated from BPR°C = 1.78x 6.22x 2 where x is weight fraction of T.S. in milk (K1).Saturated steam at 205.5 kPa (121.1°C saturation temperature) is being used.
· Fig. 4. Phase diagram at the flash inlet liquor concentration on varying the NaCl mass fraction at 1 atm."Simulation of a triple effect evaporator of a solution of caustic soda sodium chloride and sodium sulfate using Aspen Plus"
· ) in the double and triple effect cycles are taken as 80 90 and 100 oC while in the high pressure condenser (T c1) of the triple effect cycle are 150 160 and 170 oC. II. SYSTEM DESCRIPTION Figure 1 shows schematic diagram of Triple Effect vapour absorption system and its process on P-T-X diagram in Fig. 2.
Process design of a forward-feed triple effect evaporator system (Figure 1) for the process data given in section-2 1. Perform material balance to find liquid and vapor flow rates in each effect. 2. Find boiling point elevation in each effect. 3. Perform energy balance to calculate solution temperature and steam flowrate in each effect. 4.
· Evaporator Material and Energy Balance • If the heat content of the steam was used only once 100 000 lbs of steam would evaporate only 100 000 lbs of water from the liquor • Venting radiation and other losses prevent attaining theoretical efficiency Slide 8 Single Effect Operation 116k lb/hr steam 150k lb/hr WBL 15 TS 45k lb/hr SBL 50 TS
· The boiling temperatures decrease from effect to effect. This means that if the first effect is at P 1 = 1 atm abs pressure the last pressure P 3. The concept of an overall heat-transfer coefficient is used in the calculation of the rate of heat transfer in an evaporator. Figure 1.2. Simplified diagram of forward-feed triple-effect evaporator.
· A model was developed with Pro II to simulate a triple multi-effect evaporator of sugarcane juice. VLE of sucrose-water dextrose-water and fructose-water was included in the model being useful to estimate the sucrose inversion rate in each effect based on the data obtained from qualified references. 1.1 Pinch Analysis
A two-effect falling-film evaporator with thermocompressor requires about 0.32 kg of steam to evaporate 1 kg of water and a five-effect evaporator requires 0.09 kg of steam. Without the thermocompressor the specific steam consumption would be approx. 0.55 and 0.2 kg per kg of water evaporation respectively.
· Schematic diagram of a triple-effect evaporator. Liquid feed is pumped into the evaporator chamber of the first effect. Steam enters the heat exchanger and condenses through its heat transfer to the product. The condensate is discarded.
· Fig. 1. Schematic diagram of triple effect forced circulation evaporator in PCETP. The vapor leaving from the last effect is condensed in the condenser and the supersaturated liquid flows down the down flow tube and then up through the bed of fluidized and agitated crystals which are growing in size.
A triple effect forwardfeed evaporator is being used to evaporate a milk containing 10 solids to a condensed milk of 50 T.S. The boiling point rise of the milk (independent of pressure) can be estimated from BPR°C = 1.78x 6.22x2 where x is weight fraction of T.S. in milk (K1).
· Fig. 4. Phase diagram at the flash inlet liquor concentration on varying the NaCl mass fraction at 1 atm."Simulation of a triple effect evaporator of a solution of caustic soda sodium chloride and sodium sulfate using Aspen Plus"
· A diagram of this type of evaporator which may be called the conventional evaporator is given in Fig. 8.1. In the heat exchanger section called a calandria in this type of evaporator steam condenses in the space surrounding the tubes and the liquid being evaporated boils on the inside of the tubes and in the space above the upper tube plate.
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