Q3// A 3-MW steam power plant have a water tubes boiler of the following specification: Steam production 9000 kg/h Steam pressure 15 bar 300 "C 0.9 313K Steam temperature Dryness fraction of steam in the steam drum Feed water temperature Water leaving economizer heating value of the fuel Fuel consumption Flue gas temperature Flue gas density Flue gas specific heat Boiler house temperature 115 °C 31 MJ/kg 1000 kg/h 160 "C 1.15 kg/m³ 1.11 kJ/kg.K 20 °C 1.24 m Chimney diameter Velocity of flue gases leaving the chimney 3 m/s 1. Determine the overall efficiency, boiler efficiency, and equivalence evaporation. 2. Draw the heat balance sheet for the boiler (all in kW). 3. State the requirements of good steam generator. Answ(83.35%, 11.45kgs/kgf, 34.84%, 8611.11kW. 787.5kW, 5280.7kW, 1109.05kW, 647.4kW)

Q3// A 3-MW steam power plant have a water tubes boiler of the following specification: Steam production 9000 kg/h Steam pressure 15 bar 300 "C 0.9 313K Steam temperature Dryness fraction of steam in the steam drum Feed water temperature Water leaving economizer heating value of the fuel Fuel consumption Flue gas temperature Flue gas density Flue gas specific heat Boiler house temperature 115 °C 31 MJ/kg 1000 kg/h 160 "C 1.15 kg/m³ 1.11 kJ/kg.K 20 °C 1.24 m Chimney diameter Velocity of flue gases leaving the chimney 3 m/s 1. Determine the overall efficiency, boiler efficiency, and equivalence evaporation. 2. Draw the heat balance sheet for the boiler (all in kW). 3. State the requirements of good steam generator. Answ(83.35%, 11.45kgs/kgf, 34.84%, 8611.11kW. 787.5kW, 5280.7kW, 1109.05kW, 647.4kW)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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PART II: Gas turbine Introduction o Compressor (process 1 - 2) Work input, WC Increase pressure, pressure ratio p Wc = Win = mcp(T₂ - T₁) o Combustion of fuel (process 2 - 3) Heat addition, Qcc Increase temperature Qcc = Qin = m cp (T3 - T₂) o Expansion (process 3-4) High-energy fluid Useful Energy, WT WT = Wout = m Cp (T3 - T4) (1) Fuel Compressor Fresh air (2) Combustion chamber 3 Turbine Exhaust gases 4 w. net
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Power generation using steam is one of the most common method which can be found around the world. In these type of power plants, steam goes through a basic thermodynamic cycle called Rankine cycle which is shown in the following figure. Steam flow Boiler Qin Pump Wout Win Condenser •Qout For the proper operation of the cycle, water should be pumped to the boiler using pump which required work input (Wm) generate steam and then high pressure steam is fed to the turbine. By extracting the energy from high pressure steam, turbine is producing work output (Wout). Because of this, the steam pressure is reduced and low pressure steam is flowing into the condenser. Condenser removes heat energy from steam further (Qout) and steam is converted into liquid water. The liquid water can be pumped into the boiler again and the cycle continues. Performance of a Ranking cycle can be evaluated by using thermal efficiency (nth)which is determined from; the cycle. Heat energy should be supplied to the…
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