Question

A natural gas containing 82 mole% CH, and the balance C2H6 is used as a fuel to generate steam in an industrial plant (Figure 2). The natural gas is fed into a furnace at 25°C and burned at a rate of 10.000 mol/hr with 20% excess air. The heat transferred from the furnace is used to convert a liquid feed water at 25 °C into a saturated steam at 30 bar. During the combustion of natural gas, all the CH, and C Hs are combusted to form Co, CO and H O The flue gas composed of 9 mol CO,/mol CO emerges from the fumace at 330 °C, and air is supplied into the system at 200 °C. Determine the amount of steam produced (kg/hir) from the system. Given the specific heat capacities for the components are the followings: CH gC 35.7 Jmol. °C CHs(g):C 52.5 Jmol. C C,-291 Jrnol. °C 33.1 J/mol. C CO(g): C N:(g Flne gas Air Fuimace Figure 2: Generation of steam in an industrial plant (40 Marks)

Answer 1

olu-tion iuin that The hua cad ohee

h ho en 82(.孔1qoo tojto18(-83400 toj t (12วั0.JI, b

3 steam A 3 ban Enthotpy ру Hence the skam podundes 8132 X 106 '3 , 3903- -lot 6)