Question

When a chemical plant needs steam at multiple pressure levels, it is often economical to generate all the steam at a high pressurę and then to let the steam down through pressure reducing turbines to the desired pressure. This principle is illustrated in Figure 8.6. The downside of this approach is that as the exhaust pressure of the turbine increases, the theoretical (and actual) steam requirements increase, meaning that less energy is extracted. To illustrate this point, do the following: a. Estimate the amount of energy extracted from 10,000 kg/h of 58.6 barg steam superheated by 165°C when connected to the following turbines (each 80% efficient): i. Exhaust pressure is 4" Hg absolute ii. Exhaust pressure is 4.82 barg.

Answer 1

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