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Example 10 - Evaporation and Drying 1

Problem

This example is an extension of example 9. The same liquid material needs to be spray dried after being concentrated. The evaporation process has already been described in the example 9. Concentrated liquid material goes to a spray dryer. The drying air of the spray dryer needs to be at 103.2 kPa and 140 ^oC. The exhaust air is at 75 ^oC. Material outlet from the spray dryer is at 55 ^oC and 0.03 kg/kg (wet basis).

Solution:

The flowsheet is constructed as in Figure 10a. As is seen in this flowsheet part of the secondary vapor from the second effect evaporator is used to preheat the drying air.

Figure 10a

The results are displayed in Figure 10b

Figure 10b

Please note that not all the known values of the variables are presented in the statement of the Problem. Please load this example to the software and see all the known values of the variables for all the unit operations.