Application Forced Circulation Evaporator Waste Water Stream
Industry Food
Fouling Issue / Frequency

The waste stream of an alcohol plant had to be concentrated by evaporation (to be used as feed for livestock), because the company foresaw that disposal will be forbidden by new legislation. Conventional heat exchanger are not  considered because the severe fouling liquid would cause a blockage in just a few hours.

Solution / Approach

Self-cleaning heat exchanger with external circulation, with a heat transfer surface of 85 m2.

Process Conditions Tube Shell
Medium Waste Stream Condensing Steam
Pressure 0.29 bara 0.67 bara
Temperature In: 62oC
Out: 68oC
Condensing at 88oC
Flow 177 m3/h 900 kg/h
Dimensions
Number of Tubes 97
Length of Tubes 6 m
Diameter Tubes 32 mm
Particle Type Stainless Steel
Particle Size 2.5 mm
Results

Almost 20 years of operation
Constant heat transfer coefficient
Decreased waste water production avoiding pollutant emissions to the sea.

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