Q7// 11-MW steam power plant of overall efficiency of 32% is operating using coal (33 MJ/kg) as a fuel.The plant utilizes a steam generator that produces steam at 40bar and 300 °C at a rate of 10.5 kg/s. Thetemperature of the feed water is raised from 40 °C to 125 °C in the economizer and the ambient air isdrawn to the boiler at a rate of 16 kg/s at 20 °C. The temperature of flue gases (Cp=1 kJ/kg.K) leavingthe chimney is 160 °C and the dryness fraction of steam collected in the steam drum is 0.95. Determinethe boiler efficiency and set the heat balance sheet(all in kJ/kgf). Answ( 85.4%, 12.5kg steam/kg fuel,39.6%, Eeco -3597kJ/kgf, Eeva=22064.7kJ/kgf, Esup=2495.5 kJ/kgf, Eexh=2289.7 kJ/kg)

The steam power plant in question operates at an overall efficiency of 32% and utilizes coal as its…

Answered: Q7// 11-MW steam power plant of overall…

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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Steam at 20 MPa and 620°C enters a steam turbine and expands to a condenser pressure of 100 kPa. An open feedwater heater is added operating at 2 MPa. Calculate the cycle thermal efficiency in %. Use the unrounded values of the work of the turbine, work of the pump, and heat added when needed.
Consider a heat engine is operating on a steady‐flow Carnot cycle with water asthe working fluid. The water mass flow rate in cycle is 0.5 kg/s. The cyclemaximum per minimum absolute temperatures ratio is 2.5. The quality of wateris 1 at the beginning of the heat‐rejection process and 0 at the end and theambient temperature is 35°C. Show the cycle on a T‐s and P‐v diagrams relativeto the saturation lines, and determine (a) the thermal efficiency, (b) thepressure at the turbine inlet, (c) maximum temperature, minimum pressure (d)the network output, (e) the entropy changes in all processes, and (f) the actualnetwork output with second law efficiency of 45%.
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Steam at 20 MPa and 620°C enters a steam turbine and expands to a condenser pressure of 100 kPa. An open feedwater heater is added operating at 2 MPa. Calculate the cycle thermal efficiency in %. Use the unrounded values of the work of the turbine, work of the pump, and heat added when needed. Please use the green book entitled "Thermodynamics Properties of Water Including Vapor, Liquid, and Solid Phases by Keenan, Keyes, Hill, and Moore for the steam table.
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For generation of steam in a boiler requires 2500 kJ/kg of heat and in the condenser 1800 kJ/kg of heat is rejected to cooling water, using first law of thermodynamics determine steam flow rate if power developed is 210 MW during the cycle.
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A flashed steam geothermal power plant is located where underground hot water is available as a saturated liquid at 700 kPa. The well head pressure is 600 kPa. The flashed steam enters the steam turbine at 500 kPa and expands to 15 kPa when it is condensed. The flow rate from the well is 29.6 kg/s. Determine the cycle thermal efficiency of the plant in %.
Example: A cyclic steam power plant is designed to supply steam from the boiler at 10 MPa and 550 °C when the boiler is supplied with feed water at a temperature of 210°C. It is estimated that the thermal efficiency of the cycle will be 38.4% when the net power output is 100MW. Calculate the steam consumption rate (ms). The enthalpy of the feed water may be taken as being equal to the enthalpy of saturated water at the same temperature. The boiler efficiency is 87% and the HHV of the fuel is 42500 kJ/kg. Calculate the rate of fuel consumption in kg/s (m) in ton/min. 210°C. ...h = hf m my Boiler P=10 MPa T=550 °C
A flashed steam geothermal power plant is located where underground hot water is available as a saturated liquid at 700 kPa. The well-head pressure is 600 kPa. The flashed steam enters the steam turbine at 500 kPa and expands to 15 kPa when it is condensed. The flow rate from the well is 29.6 kg/s. Determine the cycle thermal efficiency of the plant in %. FINAL ANSWER MUST BE IN 3 DECIMAL POINTS

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