Chemical Process Design and Integration. Robin Smith. Chapter 23 exercise 1

1. A boiler with a capacity of 100,000 kg.h- is required to produce steam of 40 bar and 350C. The feedwater from the deaerator is at 100C and contains 100 ppm dissolved solids. Maximum dissolved solids allowed in the boiler is 2000 ppm. The steam system operates with 60% condensate return. Enthalpy data for steam are given in Table 23.10. Calculate: a. the blowdown rate Table 23.10 Enthalpy data for Exercise 1. Enthalpy at 40 bar (kJ-kg-1) Steam at 350C Saturated steam Saturated condensate Water at 100C 3095 2800 1087 422 b. the energy consumption for a boiler efficiency of 88%