6.14 The fuel for the preliminary design of a 500,000-kW steam power plant with a 40% thermal efficiency is to be coal a

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6 14 The Fuel For The Preliminary Design Of A 500 000 Kw Steam Power Plant With A 40 Thermal Efficiency Is To Be Coal A 1 (141.3 KiB) Viewed 34 times

6.14 The fuel for the preliminary design of a 500,000-kW steam power plant with a 40% thermal efficiency is to be coal at 5 $/ton. The as-fired gravimetric analysis of the coal for the initial design analysis is given below: c. 74.79% S 3.42% N 1.20% H 4.98% 02 6.42% H2O 1.55% Ash 7.82% Calculate, for the unit: (a) the specific fuel consumption, kg/kW hr, and (b) the fuel cost for operation, $/hr. 6.15 A western U.S. coal has the following ultimate analysis: C, 72.3% s 0.5% N 1.3% H5.8% O, 14.9% Ash 5.2% Estimate (a) the higher heating value of the coal, kJ/kg; (b) the dry SO, in the stack if the flue gas is 3% 0%, %; (c) the NO, concentration as NO, assuming all the chemically bound nitrogen is converted to NO, %; and (d) repeat parts (6) and (c) product analysis, kg product/million kJ fuel. 6.16 A fuel plant is designed to convert municipal solid waste (MSW) into a refuse- derived fuel (RDF). The plant is supplied with MSW, having the ultimate analysis shown below at a rate of 1200 tons/day. C 25.2% s 0.1% H,0 28.0% H 3.3% O 21.1% Ash 5.6% Glass 9.3% Metal 7.4% For ideal conversion, determine the following: (a) mass flow rate of recoverable glass and metal, kg/day; (b) mass flow of landfill inerts, kg/day; (c) mass flow of RDF, kg/day; (d) higher heating value of MSW, kJ/kg; and (e) higher heating value of RDF, kJ/kg. 6.17 Determine the adiabatic flame temperature of the anthracite coal in Problem 6.1 when burned at constant pressure with 130% theoretical air. Assume that both the fuel and air are initially at 1 atm and 25°C. 6.18 A l-g sample of solid carbon is burned in 200% excess air in a bomb calorimeter. The initial fill conditions are 62°F and 15 psia. After combustion in the constant- volume vessel, determine (a) the product mole fractions for complete combustion;