I need help regarding the issue of throttling to reduce pressure.
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The oil-gas-water mixture passes through a throttle valve to have its pressure reduced from 6 MPa to 2 MPa, and then undergoes a second throttling step to lower the pressure further from 2 MPa to 0.4 MPa. Simulations using ProII and HYSYS show that the temperature drop during the first pressure reduction is approximately 18 degrees, while the temperature drop during the second pressure reduction is about 40 degrees. May I ask, is throttling for temperature reduction related to the ratio of pressure drop to something, or to the value of the pressure drop itself? The first pressure reduction was by 4 MPa, and the second by 1.6 MPa – why was the temperature drop greater in the second case? Is there an issue with my simulation calculations?
It might be fine. One has no phase change, while the other may have a phase change. After all, there is water inside.
PV=nRT, so it is a ratio, not an absolute value.