5. Consider a cogeneration power plant modified with regeneration as shown in the Fig. 2 Steamenters the turbine at 6 MPa and 450 °C and expands to pressure of 0.4 MPa. At this pressure2 of60% of the steam is extracted from the turbine and the remainder expands to 10 kPa. Part of theextracted steam is used to heat the feedwater in an open feedwater heater. The rest of the extractedsteam is used for process heating and leaves the process heater as a saturated liquid at 0.4 MPa. Itis subsequently mixed with the feedwater leaving the feed water heater, and the mixture is pumpedto the boiler pressure. Assume the turbines and pumps to be isentropic, determine the mass flow17.7 kg/rate of steam through the boiler for a net power output of 15 MWTurbine8BoilerProcessheater-tCondenserFWHPump IIPump IFigure 2: An Cogeneration power plant

Answered: 5. Consider a cogeneration power plant…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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thermodynamics
Q1) Consider a cogeneration power plant modified with regeneration. Steam enters the turbine at 6 MPa and 450 °C at a rate of 60 kg/s and expands to a pressure of 0.4 MPa. At this pressure, 20% of the steam is extracted from the turbine, and the remainder expands to a pressure of 10 kPa. Part of the extracted steam is used to heat feedwater in an open feedwater heater. The rest of the extracted steam is used for process heating and leaves the process heater as a saturated liquid at 0.4 MPa. It is subsequently mixed with the feedwater leaving the feedwater heater, and the mixture is pumped to the boiler pressure. The steam in the condenser is cooled and condensed by the cooling water from a nearby river, which enters the adiabatic condenser at a rate of 600 kg/s. The enthalpies of all respective points of the system are given below. Turbine h = 191.81 hz = 192.20 h3 = h4 = h, = 604.66 hs = 610.73 hg = 3302.9 h, = hg = h10 = 2665.6 Boiler 11 10 Process heater Condenser| hu = 2128.8 4 PI…
Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Determine the Wnet (kJ/kg). (Use 2 decimal places for the final answer.)
Biomass is used as fuel to power the following cogeneration plant on a school. The turbine drives an electric generator to produce electricity, and part of the steam is extracted to provide heating to campus buildings. The boiler provides 106 kg/h of steam at 6 MPa, 520 °C, of which 4x105 kg/h is extracted between the first and second turbine stages at 1 MPa and diverted to the building heating load. Condensate returns from the building heating load at 0.95 MPa, 115 °C, and it is mixed with liquid exiting the lower pressure pump at 0.95 MPa. The entire flow is then pumped to the boiler pressure. Saturated liquid at 6 kPa leaves the condenser. The turbine stages and the pumps operate with isentropic efficiencies of 89 and 85%, respectively. The efficiency of the electric generator is 93% for converting turbine mechanical power into electricity. Calculate the heating load in kJ/h. Calculate the electric power generated in MWe.
PROBLEM: Steam power plant with ideal Rankine cycle. Steam enters the turbine at 4MPA and 700°C. The steam is cooled in the condenser at 20 kPa using cooling water. The net power output of the cycle is 100MW. Determine: a) The power produced by the turbine and consumed by the pump, b) thermal efficiency of the cycle, c) mass flow rate of the steam, and d) the mass flow rate of the condenser cooling water, if the cooling water enters the condenser at 15 °C and exits at 35°C. Draw the T-s diagram.
Thermodynamic
Consider a steam power plant that operates on a simple ideal Rankine cycle and has a net power output of 120 MW. Steam enters the turbine at 10 MPa and 550° c and is cooled in the condenser at a pressure of 15 kPa by running cooling water from a nearby source the condenser at a rate of 3000 kg/s. Determine the enthalpy h4 at the outlet of the Turbine
2. Steam enters the turbine of an ideal Rankine cycle at 8 MPa and expands adiabatically to 10 kPa. If the moisture content of the steam at the turbine exit is not to exceed 0.1, calculate the thermal efficiency of the cycle.
Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Determine the Qout (kJ/kg).(Use 2 decimal places for the final answer.)
Concentrating solar collectors are used to provide the heat source for a Rankine cycle using water as the working substance. The design specifications require a power output of 10 MW. Commercially available collectors allow steam to be generated at 2500 kPa and 3200C. The cycle low pressure is assumed to be 8 kPa. Determine (a) the cycle thermal efficiency; (b) the mass flow rate of steam; and (c) the mass flow of cooling water if its temperature increases by 12oC.
Asnwer all the five questions.

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