Consider a cogeneration power plant that is modified with reheat and that produces 3 MW of power and supplies 7 MW of process heat. Steam enters the high- pressure turbine at 8 MPa and 500°C and expands to a pressure of (1 MPa. At this pressure, part of the steam is extracted from the turbine and routed to the process heater, while the remainder is reheated to 500°C and expanded in the low-pressure turbine to the condenser pressure of 15 kPa. The condensate from the condenser is pumped to 1 MPa and is mixed with the extracted steam, which leaves the process heater as a compressed liquid at 120°C. The mixture is then pumped to the boiler pressure. Assuming the turbine to be isentropic, show the cycle on a T-s diagram with respect to saturation lines, and disregarding pump work, determine (a) the rate of heat input in the boiler and (b) the fraction of steam extracted for process heating.

Consider a cogeneration power plant that is modified with reheat and that produces 3 MW of power and supplies 7 MW of process heat. Steam enters the high- pressure turbine at 8 MPa and 500°C and expands to a pressure of (1 MPa. At this pressure, part of the steam is extracted from the turbine and routed to the process heater, while the remainder is reheated to 500°C and expanded in the low-pressure turbine to the condenser pressure of 15 kPa. The condensate from the condenser is pumped to 1 MPa and is mixed with the extracted steam, which leaves the process heater as a compressed liquid at 120°C. The mixture is then pumped to the boiler pressure. Assuming the turbine to be isentropic, show the cycle on a T-s diagram with respect to saturation lines, and disregarding pump work, determine (a) the rate of heat input in the boiler and (b) the fraction of steam extracted for process heating.

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

See similar textbooks

Similar questions

Consider an 80 MW coal-fired steam power plant that runs on a reheat Rankine cycle. Steam enters the high-pressure turbine at 10 MPa and 500°C and the low-pressure turbine at 1 MPa and 500°C. Steam leaves the condenser as a saturated liquid at 10 kPa. Calculate the plant monthly consumption of coal if its heating value is 23,247 kJ/kg and the boiler has an efficiency of 87%. in metric tons
Consider a steam power plant that operates on a reheat Rankine cycle and has a net power output of 80 MW. Steam enters the high-pressure turbine at 10 MPa and 500C and the low-pressure turbine at 1 MPa and 500C. Steam leaves the condenser as a saturated liquid at a pressure of 10 kPa. The isentropic efficiency of the turbine is 80 percent, and that of the pump is 95 percent. (a) Determine the quality (or temperature, if superheated) of the steam at the turbine exit, (b) Determine the thermal efficiency of the cycle, (c) Determine the mass flow rate of the steam, (d) Show the cycle on a T-s diagram with respect to the vapor dome and specifying T and s in all principal points of the cycle.
Consider a 150-MW steam power plant that operates on a simple Rankine cycle. Steam enters the turbine at 7 MPa and 500°C and is cooled in the condenser at 10 kPa. Calculate the plant monthly consumption of coal if its heating value is 26,450 kJ/kg and the boiler has an efficiency of 90%. Assume an isentropic efficiency of 87% for both the turbine and the pump.
Steam enters the high-pressure turbine of a steam power plant that operates on the ideal reheat Rankine cycle at 800 psia and 900F and leaves as saturated vapor. Steam is then reheated to 800F before it expands to a pressure of 1 psia. Heat is transferred to the steam in the boiler at a rate of 6 * 104 Btu/s. Steam is cooled in the condenser by the cooling water from a nearby river, which enters the condenser at 45F. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the pressure at which reheating takes place, (b) the net power output and thermal efficiency, and (c) the minimum mass flow rate of the cooling water required.
Consider a steam power plant that operates on a simple ideal Rankine cycle and has a net power output of 45MW. Steam enters the turbine at 7 MPa and 500 ˚C and is cooled in the condenser at a pressure of 10kPa by running cooling water from a lake through the tubes of the condenser at a rate of 2000 kg/s. Show the schematic diagram of the power plant and draw the cycle on a T-s diagram with respect to saturation lines. Also, determine (a) the thermal efficiency of the cycle, (b) the mass flow rate of the steam, and (c) the rise in temperature of the cooling water. Repeat your calculations assuming an isentropic efficiency of 85 and 90 for the turbine and the pump, respectively.
A steam power plant operates on a reheated Rankine cycle. Steam enters the high pressure turbine at a pressure of 12.5 MPa and a temperature of 550 ̊C, with a flow rate of 7.7 kg/s and exits at a pressure of 2 MPa. The steam is then heated to 450 C at constant pressure before being expanded in the low pressure turbine and exits the condenser as a saturated liquid at 10 kPa. Since the isentropic efficiencies of the turbine and the pump are 85 percent and 90 percent, respectively; a) degree of dryness, b) net power, c) thermal efficiency of the cycle
Consider a reheat-regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an open feedwater heater. Steam enters the first turbine at 8000 kPa and 480oC and expands to 700 kPa. The steam is reheated to 440oC before entering the second turbine, where it expands to the condenser pressure of 8 kPa. Steam is extracted from the first turbine at 2000 kPa and fed to the closed feedwater heater. The feedwater leaves the closed heater at 205oC and 8000 kPa and enters the boiler to complete the cycle. The condensate from the closed feedwater heater is throttled into the open feedwater heater. Steam extracted from the second turbine at 300 kPa is also fed into the open feedwater heater, which operates at 300 kPa. The stream exiting the open feedwater heater is saturated liquid at 300 kPa. The net power output of the cycle is 100 MW. If the working fluid experiences no irreversibilities as it passes through the turbines and pumps, determine: (a) mass flowrate of…
Please could you explain to me how to solve this exercise Consider a modified cogeneration power plant with regeneration. Steam enters the turbine at 6MPa and 450ºC at a rate of 20Kg/s, and expands to a pressure of 0.4MPa. At this pressure 60% of the water vapour is extracted from the turbine, and the rest is expanded to a pressure of 10KPa. Part of the extracted steam is used to heat the feed water in an open feed water heater. The rest of the extracted vapour is used for process heating, and leaves the process heater as a saturated liquid at 0.4MPa. It is then mixed with the feed water leaving the feed water heater, and the mixture is pumped to boiler pressure. The vapour in the condenser is cooled and condensed by cooling water from a nearby river, which enters the adiabatic condenser at a rate of 463Kg/s. Consider the ideal equipment and demonstrate the enthalpy values shown a) The temperature rise of the river cooling water in the condenser is: (R=8°C) b) The mass flow of steam…
Scenario (1)The first steam power plant operates on an ideal reheat Rankine cycle. Steam enters the first turbine at 8 MPa and 500 C and leaves at 3 MPa. Steam is then reheated at a constant pressure to 500 C before it expands to 20 kPa in the low-pressure turbine. Assuming that heat is being added to the boiler from a high temperature source at 1800 K and the condenser is transferring heat to a temperature sink at 300 K. Task 1 Investigate the effect of changing turbine efficiency on the overall thermal efficiency of the thermodynamic cycle. (Hint: You will assume different values for the isentropic turbine efficiency such as: 70%, 80%, 90%, 95%, and 100%, then observe how it will change the thermal efficiency of the cycle). Representing the results in a plot is recommended.
Steam enters the high-pressure turbine of a steam power plant that operates on the reheat Rankine cycle at 10 MPa and 550°C and leaves at 4 MPa. Steam is then reheated to 500°C before it expands to a pressure of 40 kPa. The enthalpy of steam is 3190 kJ/kg at the exit of the high-pressure turbine, and 2550 kJ/kg at the exit of the low-pressure turbine. Disregarding the pump work, the cycle efficiency is
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. Assuming an isentropic efficiency of 85 percent for both the turbine and the pump, determine the actual mass flow rate (kg/s) of the steam. (Use 2 decimal places for the final answer.)
A steam turbine cycle running on a Rankin cycle between a condenser pressure of 10 kPa and a boiler pressure of 20 MPa, the steam enters the high pressure turbine at a temperature of 600 ° C. The average turbine expands to 800 kPa and then enters the boiler again to be reheated to 500 ° C. The steam leaves the boiler to a low pressure turbine, where it expands to the condenser pressure. If the expansion and compression in the turbine and the pump is isotropic, and the addition of heat is constant pressure, find the efficiency of the cycle. Note point # 1 at the vapor exit region of the condenser