Real exam questions on chemical engineering: Regarding the installation height of the bottom pump in a distillation tower

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Calculation process required: 23. The operating pressure at the top of the distillation column is 0.08 MPa(G), the total pressure drop across the columns is 0.03 MPa, and the density of the fluid in the bottom of the column at the operating temperature is 640 kg/m3. The height of the tower bottom (from the tangent at the bottom of the tower to the first tray) is 6 m. Under normal operation, the liquid level at the tower bottom is at least 15%, and the height of the centerline of the centrifugal pump at the bottom of the tower above the ground is 0.5 m. As shown in the figure below (the length in the figure is in mm). Assume that the total pressure loss on the suction side of the pump is 0.015 Mpa, the required net positive suction head is 3 m, and the safety margin is taken as 0.5 m. Then, the minimum height (m) of the tower skirt base (H) shall be not less than which of the following values? 2 F! ^& A3 t# m# i9 K