Heat transfer solutions Thermocompressors
6
Control The compression ratio is 2.25 (see the example on page 4 that illustrates how to calculate the compression ratio) so the SJT Steam Jet Thermocompressor will be 'Sonic'. Therefore the calculated Motive (HP) steam flowrate must be fixed. The SJT Steam Jet Thermocompressor is designed for a Suction flowrate of 1 500 kg/h. Without control, if the Suction (LP) steam flowrate falls, the SJT will try and suck harder and the Suction pressure will begin to fall. Consequently, in this application, we can install a simple 'recycle' loop. This recycles some discharge steam back to the suction. By maintaining the Suction flow, the SJT operates at its design point which keeps the Suction pressure constant.
Typical application drawings:
Motive steam
Steam line
To process
Flash
Process heat exchanger
Flash vessel
Condensate line
Condensate pump
Typical SJT Steam Jet Thermocompressor application
6.3 10
Motive steam
Make-up steam valve
Flash blow through
Drying cylinder
Condensate line
Separator
Condensate pumped back to feedwater tank
Typical Paper Mill application
TI-P493-02 TES Issue 3
Page 10 of 11
SJT Steam Jet Thermocompressor
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