Heat transfer solutions Thermocompressors
6
Control options The schematic below illustrates every possible control option that could be used to control an SJT Steam Jet Thermocompressor.
Motive
1
3
2
Discharge
5
4
6
Suction
Sonic designs: Option 6
is usually used to maintain the Suction (LP) pressure (if required)
Options 4 or 5 are occasionally used instead Option 3
can be used to bypass additional steam to the discharge Please note that you cannot choose Options 1 or 2 if the SJT Steam Jet Thermocompressor is 'Sonic'
6.3 6
Subsonic design Option 2
can be used to control the Motive (HP) steam flow from 100% to 35%
Option 1
can be used to control the Motive (HP) steam flow from 100% to 80%
can be used to bypass additional steam to the discharge. Options 4 or 5 or 6 are occasionally used to maintain the Suction (LP) pressure.
Option 3
Most applications will only use one of the options. Some applications do not require any control. An SJT Steam Jet Thermocompressor will always balance itself to the system pressures. You should decide what parameter (pressure, flow etc.) you wish to control as this will determine what option is best for the given application. Spirax Sarco can provide assistance in selecting the best control option for the intended application to provide optimum performance and return on investment.
10.3.7
TI-P493-02 TES Issue 3
Page 6 of 11
SJT Steam Jet Thermocompressor
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