The bottoms product from a distillation column is pumped through two heat exchangers to recover energy and is then sent to a storage tank, which is at atmospheric pressure. The system is shown in Figure P22.23(a).

Figure 22.23 (a)

The pump curve for \(\mathrm{P}-2904 \mathrm{~A} / \mathrm{B}\) is shown in Figure P22.23(b). At design conditions, the flow through the pump is \(5 \mathrm{~L} / \mathrm{s}\), the pressure in T-2903 is \(200 \mathrm{kPa}\), and the frictional loss (for the process fluid) through the piping and heat exchangers, but excluding the control valve, is 250 \(\mathrm{kPa}\). You may assume that the difference in height between the liquid level in T-2903 and Tk2901 is negligible. For this system, answer the following questions:

a. What is the pressure drop across the control valve at design conditions?

b. Under design conditions, the \(250 \mathrm{kPa}\) frictional pressure drop is distributed as shown in Table P22.23.

Figure 22.23 (b)

Table 22.23

c. What is the pressure of the liquid entering E-2904 and E-2905 at a scaled-up condition, which is \(150 \%\) of the base-case flowrate?

Transcribed Image Text:

T-2903 T-2904 A/B CV bfw CW Tk-2901 E-2904 E-2905