6.6 An oil-fired steam generator is connected to a steam engine, which produces 50 kW of...
I) Boiler superheater [3 marks) B) A steam boiler fired with oil of calorific value of 42 MJ/kg generates steam at a rate of 2500 kg/h and 1.5 MPa. The generated steam is further heated in a superheater to a temperature of 300°C. Feed water at 30°c is preheated to 90°C through passage in the economizer. The boiler unit has an efficiency of 78% i) Calculate the fuel/oil consumption rate (in kg/h) ii) Calculate the percentage increase in fuel consumption...
Consider a coal-fired steam power plant that produces 175 MW of electric power. The power plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 8 MPa and 560°C and a condenser pressure of 8 kPa. The coal has a heating value (energy released when the coal is burned) of 29,300 kJ/kg and a CO2 emission value of 0.093 kg CO2/MJ. Assuming that 85% of this energy is transferred to heat in the boiler and that the...
7.4 A coal-fired 930-MW power plant is operating under the following conditions: Coal carbon content C = 80%, coal ash content A = 6%, and heating value LHV = 30 MJ/kg Cooling water temperature difference Atew = 10.5 K Plant electrical efficiency ne is 0.43 and capacity factor CF is 0.82. Boiler efficiency n = 0.92 ESP efficiency nesp = 99% Calculate (a) the plant fuel rate, (b) the hourly and annual CO, emission rates, (c) the specific CO2 emissions...
Water is the working fluid in a Rankine cycle. Steam exits the steam generator at 1500 lbf/in.2 and 1100°F. Due to heat transfer and frictional effects in the line connecting the steam generator and turbine, the pressure and temperature at the turbine inlet are reduced to 1400 lbf/in.2 and 1000°F, respectively. Both the turbine and pump have isentropic efficiencies of 95%. Pressure at the condenser inlet is 2 lbf/ in. 2, but due to frictional effects the condensate exits the...
A coal-fired steam power plant produces 175 MW of electric power. The power plant operates on a Rankine cycle with turbine inlet conditions of 7 MPa and 550oC and a condenser pressure of 15 kPa. The turbine efficiency and pump efficiency are both 0.8. The coal has a heating value (energy released when the fuel is burned) of 29,300 kJ/kg. Assuming that 85 percent of this energy is transferred to the steam in the boiler and that the electric generator...
Problem 8.015 Water is the working fluid in a Rankine cycle. Steam exits the steam generator at 1500 lbf/in.2 and 1100℉ Due to heat transfer and frictional effects in the line connecting the steam generator and turbine, the pressure and temperature at the turbine inlet are reduced to 1400 Ibf/in.2 and 1000 , respectively. Both the turbine and pump have isentropic efficiencies of 95%. Pressure at the condenser inlet is 2 lbf/ in.2, but due to frictional effects the condensate...
A 3 litre, four-stroke, four-cylinder CI engine running at 3000 rpm produces 48 kW of brake power. Brake thermal efficiency is 30% and the calorific value of fuel is 42 MJ/kg. Assume density of air at ambient condition is 1.1.81 kg/m3, air-fuel ratio 21:1 and mechanical efficiency 0.8. Determine: (a) Rate of fuel flow into the engine (kg/s) (b) Rate of air flow into the engine (kg/s) (c) Mass rate of exhaust flow (kg/s) (d) Volumetric efficiency (e) Indicated thermal...
wGTC η.cn = 95% Gas turbine cycle (GTc) e,I = 100 kW Compressor Turbine Generator 께,- Combustor Pi 100 kPa Regenerator Evaporator Turbine Generator Vapor turbine cycde (VTC) T, = T, + 20 K Condenser 10 Pump Saturated liquid A combined cycle plant operates with a topping gas turbine and a bottoming vapor turbine cycle. The working fluid in the vapor turbine cycle is water. The gas turbine cycle (GTC) electric generator produces 100kW of electric power For air use...
3) A solar powered steam generator operates under an ideal Rankine cycle. Water at a pressure of 15MPa enters the turbine as saturated vapor and leaves with a pressure of 0.125MPa. The mass flow rate in the cycle is 100 kg/s, while the temperature difference in the condenser water is 24 Celsius. Draw the T-s diagram of this ideal Rankine cycle. Determine the following: A) The net power developed in the cycle in kW B) The rate of heat transfer...
1. Engine oil (c-2100 J/kg- C) is to be heated from 20 °C to 60 °C at a rate of 0.3 kg/s in a 2-cm diameter thin-walled copper tube by condensing steam outside at a temperature of 130 °C (hfs 2174 kJ/kg) a. For an overall heat transfer coefficient of 650 W/m2-°C, determine the rate of heat transfer and the length of tube required to achieve it. Determine also the rate of steam condensation, in kgsteam/sec. (Ans: 25.2 kW; 7.0...