Heat transfer solutions Thermocompressors
6
Understanding SJT Steam Jet Thermocompressor discharge pressures (continued)
If a small section of pipework is placed after the SJT which has a pressure drop of 0.1 bar, the pressure immediately downstream of the SJT is 0.1 bar g. The pressure after the pipework is atmospheric.
P d = 0.1 bar g
D P = 0.1 bar g
If we add a process after this pipework, for example a heat exchanger, with a pressure drop of 0.5 bar, the pressure at the discharge branch of the SJT is 0.6 bar g.
P d = 0.6 bar g
Heat exchanger
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D P = 0.1 bar g
DP = 0.5 bar
Now, if we take a process (or a steam header) that operates at a pressure of 16 bar g, and the pressure drop through the pipework between the process and the SJT is 2.5 bar, the pressure at the discharge of the SJT is 18.5 bar g.
6.3 4
Steam header = 16 bar g
D P = 2.5 bar
For the purpose of this example the SJT is operating at its design discharge pressure as the unit was designed for a discharge pressure of 18.5 bar g. Please note that the SJT Steam Jet Thermocompressor does not 'create' the discharge pressure. It is designed to match a discharge pressure.
10.3.5
TI-P493-02 TES Issue 3
Page 4 of 11
SJT Steam Jet Thermocompressor
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