Calculate the surface area and steam consumption
A forward feed triple effect evaporator is used to fed 13608 kg/hr of NaOH solution containing 10 wt% solute. The entering feed temperature is 37.8°C. It is to be concentrated to a 50% NaOH solution. The steam used to enter at 58.6 kPa gage. The absolute pressure in the vapor space the third effect is 6.76 kPa. The heat transfer coefficient are U;=6246, U.=3407, and Uz=2271 W/m²K. All effects must have the same area. Calculate the surface area and steam consumption (Hint: Assume no BPR at 1st and 2nd effect)
Homework Answers
Evaporation of Sugar Solution in a Multiple-Effect Evaporator. A triple-effect evaporator with forward feed is...
Evaporation of Sugar Solution in a Multiple-Effect Evaporator. A triple-effect evaporator with forward feed is evaporating a sugar solution with negligible boiling- point rise (less than 1.0 K, which will be neglected) and containing 5 wt% solids to 25% solids. Saturated steam at 205 kPa abs is being used. The pressure in the vapor space of the third effect is 13.65 kPa. The feed rate is 22 680 kg/h and the tempera- ture 299.9 K. The liquid heat capacity...
Separation Process Problem 1 [30 marks] A double-effect forward-feed evaporator is used to concentrate a 5...
Separation Process Problem 1 [30 marks] A double-effect forward-feed evaporator is used to concentrate a 5 wt% aqueous NaCl solution to a final concentration of 25 wt% The feed enters the first effect at a temperature of 40°C. Saturated steam at a pressure of 2 bar (absolute) is fed to the first effect at a rate of 1500 kg/h, and the vapour from this effect is used to supply heat to the second effect. The overall heat transfer coefficient in...
Please could you answer all sub questions. A forward feed triple - effect evaporator is required...
Please could you answer all sub questions.
A forward feed triple - effect evaporator is required to concentrate a 10% pineapple juice mixture from 5 to 70% using steam at 200 kN/m2 (gauge). The feed enters at 2 000 kg/hr at 303 K and the first effect is operated at 105 kN/m2 (gauge). Additional information: 1. The BPR's can be estimated from the following equation: BPR (°C) = 1,78 X + 6,22 X2: 2. The heat capacity of the solution...
1. There are several evaporators, including agitated film evaporator, long-tube evaporator, short-tube evaporator, and horizontal-tube evaporator....
1. There are several evaporators, including agitated film evaporator, long-tube evaporator, short-tube evaporator, and horizontal-tube evaporator. For (a) juice and (b) paste, suggest proper evaporator and explain why you select it. 2. A double-effect forward-feed evaporator is used to evaporate a sugar solution containing Swt solids to a concentrated solution of 25 wt%. The boiling-point rise (BPR) of the solution (independent of pressure) can be estimated from BPRC-1.5x + 6x", where x is wt% of sugar in solution. Saturation steam...
Separation Process Problem 1 [30 marks] A double-effect forward-feed evaporator is used to concentrate a 5 wt% aqueous NaCl solution to a final concentration of 25 wt% The feed enters the first effect at a temperature of 40°C. Saturated steam at a pressure of 2 bar (absolute) is fed to the first effect at a rate of 1500 kg/h, and the vapour from this effect is used to supply heat to the second effect. The overall heat transfer coefficient in...
Please could you answer all sub questions.
A forward feed triple - effect evaporator is required to concentrate a 10% pineapple juice mixture from 5 to 70% using steam at 200 kN/m2 (gauge). The feed enters at 2 000 kg/hr at 303 K and the first effect is operated at 105 kN/m2 (gauge). Additional information: 1. The BPR's can be estimated from the following equation: BPR (°C) = 1,78 X + 6,22 X2: 2. The heat capacity of the solution...
1. There are several evaporators, including agitated film evaporator, long-tube evaporator, short-tube evaporator, and horizontal-tube evaporator. For (a) juice and (b) paste, suggest proper evaporator and explain why you select it. 2. A double-effect forward-feed evaporator is used to evaporate a sugar solution containing Swt solids to a concentrated solution of 25 wt%. The boiling-point rise (BPR) of the solution (independent of pressure) can be estimated from BPRC-1.5x + 6x", where x is wt% of sugar in solution. Saturation steam...
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