Issues with the parameters of the depropanization tower! ! !
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In the depropanization column of the gas separation unit, the specified parameters are a bottom temperature of 100±10, a top temperature of 48±3, and a top pressure of 1.6–1.95. Can the top pressure be below 1.6 MPa? What happens if the temperature at the bottom of the tower is below 90? I think there is some logic behind these indicators; I’m not sure why these specific values were chosen. What would happen if different values were used? Thank you, please provide a reasonable explanation
If the pressure at the top of the tower is low, then heavier components will enter the gas phase； The temperature at the bottom of the tower is not high enough, resulting in inadequate separation and propane remaining in the liquid phase.
The depropanization tower in the gas processing unit is a typical distillation tower, and the setting of its parameters follows the principle mentioned by the original poster – there is a rationale behind each parameter. The temperatures and pressures at the top and bottom of the tower are closely related to the phase equilibrium of the fluid streams as well as the external utility conditions. Can the pressure at the top of the tower be reduced a bit? ? ? ? The answer is yes, but after reducing the pressure at the top of the tower, the temperature at that location also needs to be lowered; as a result, circulating water cannot be used as a cooling medium for the top of the tower. It is necessary to install a refrigeration system to supply chilled water to that area. This will result in increased operating costs and investment for the equipment. The economic viability of operating the device becomes meaningless. The issue of reduced bottom temperature: Under unchanged other conditions, how can an upward-moving gas phase be ensured inside the tower when the bottom temperature decreases? ? ? ? ? The poster needs to study the relevant theories of distillation.