Explain a double effect backward feed evaporator

Reference no: EM13213200

A feed containing 15% by weight of solids is to be concentrated to 40 % solids using a double effect backward feed evaporator. The first effect is heated by steam at 413 K. Vapour from the second effect is condensed at a pressure corresponding to 325 K. The heat transfer area is 10 m2 and the overall heat transfer coefficients are 3 and 2 kW/m2 in the first and second effects respectively. The boiling point rise is 3 K in the first effect and zero in the second effect. If the feed enters at 310 K what is the maximum feed rate that can be accommodated?

It may be assumed that the heat loads on the two effects are equal and that the latent heats of evaporation and specific heats of the solutions are constant at 2330 kJ/kg and 4.18 kJ/kg respectively.

Reference no: EM13213200

Questions Cloud

Explain role of inventories in keeping actual expenditures : Draw a graph representing a hypothetical economy. Carefully label the two axes, the S + T + IM curve, the I + G +EX curve, and the equilibrium level of real GDP. Illustrate the effect of an increase in the level of autonomous saving.

Compute the minimum number of grams : calculate the minimum number of grams of C3H8(g) that must be combusted to provide the energy necessary to convert 2.93 kg of H2O from its solid form at -13.0°C to its liquid form at 75.0°C.

State done to inflate the balloon when atmospheric pressure : How much work (in J) must be done to inflate the balloon when atmospheric pressure is 767 torr?

Discuss the mission-vision-values and goals of walmart : 1. Discuss the mission, vision, values, and goals of Walmart. Relate and connect this to the case reading, chapter 1, frontline video and corporate website for Walmart. 2. Do you think vision, mission, goals, or even values take the lead role at W..

Explain a double effect backward feed evaporator : A feed containing 15% by weight of solids is to be concentrated to 40 % solids using a double effect backward feed evaporator. The first effect is heated by steam at 413 K.

Compute the work done on the surrounding atmosphere : Calculate the work done (in J) on the surrounding atmosphere (1atm pressure, 25.8 oC ) by the evolution of hydrogen in the subsequent reaction

Calculate the nominal and the effective rate of return : A 10-year, 12%, $1000 bond that pays dividends quarterly can be purchased for $900. If the bond is purchased and pays as scheduled, calculate the nominal and the effective rate of return that the purchaser receives.

Difference between cccs expected roe : What is the difference between CCC's expected ROE if it finances with 50% debt versus its expected ROE if it finances entirely with common stock?

Does price exceed average variable cost for the first units : A purely competitive firm finds that the market price for its product is $30.00. It has a fixed cost of $100.00 and a variable cost of $17.50 per unit for the first 50 units and then $37.50 per unit for all successive units. Does price exceed aver..

User Account

All Pages