Question

1. A solution of colloidal solution is to be concentrated from 15 to 50% solids in a vertical-tube evaporator. The solution has a negligible elevation in boiling point and the specific heat of the feed entering at 15 0C is 0.93. The pressure of the saturated steam to the evaporator is 0.8 atm abs; the condenser pressure is 100 mmHg abs. The steam chest has an overall heat transfer coefficient of 1700 W/m2-K. Water must be evaporated at the rate of 25000 kg/hr. How many square meters of surface are required, and what is the steam consumption in kilograms per hour?

Answer 1

Heat balance. Heat available per kg of steam. = latent heat + sensible heat in cooling to 91°C. = 2.164 x 106 + 4.186 x 103(134 - 91) ...

Heat-transfer area. Temperature of condensing steam = 134°C. Temperature difference across the evaporator = (134 - 91) = 43°C. ...

Heat balance.

Answer 2

Answer:

The Solution Has A Negligible Elevation Of The Boiling Point, And The Specific ... colloids should be concentrated from 15 to 50% in a vertical tube evaporator

Explanation:

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