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A boiler takes in pressurized water at 187.96°C(Psat = 1.2MPa) and 13 MPa (stream 1) to produce 570°C steam (Stream 2) at constant pressure. The steam produced from this boiler is to be split such that they enter two separate turbines. The first turbine discharges the steam to 1.2MPa and 230°C (stream 3), while the second turbine which produces work at a rate of 1989 kW discharges 90% quality steam at 22kPa (stream 4). The discharge of the second turbine is then fed to a condenser where all the steam is fully condensed (stream 5) at constant pressure. This condensed stream is fed to a pump where the pressure is increased to 1.2 MPa (stream 6) at constant temperature. The first turbine discharge (stream 3) and the pumped liquid (stream 6) are then mixed in a ratio such that the product of the mixer is saturated liquid at 1.2MPa (stream 7) (assume no heat losses in the mixer). This saturated liquid from the mixer is fed to another pump to increase the pressure back to 15MPa which is then fed back to the boiler to complete the cycle. For this problem, assume that there are negligible kinetic energy changes. A. Draw the block flow diagram of the process. B. Determine the specific enthalpies of all streams C. Calculate the mass flowrate of steam flowing through the second turbine

A boiler takes in pressurized water at 187.96°C(Psat = 1.2MPa) and 13 MPa (stream 1) to produce 570°C steam (Stream 2) at constant pressure. The steam produced from this boiler is to be split such that they enter two separate turbines. The first turbine discharges the steam to 1.2MPa and 230°C (stream 3), while the second turbine which produces work at a rate of 1989 kW discharges 90% quality steam at 22kPa (stream 4). The discharge of the second turbine is then fed to a condenser where all the steam is fully condensed (stream 5) at constant pressure. This condensed stream is fed to a pump where the pressure is increased to 1.2 MPa (stream 6) at constant temperature. The first turbine discharge (stream 3) and the pumped liquid (stream 6) are then mixed in a ratio such that the product of the mixer is saturated liquid at 1.2MPa (stream 7) (assume no heat losses in the mixer). This saturated liquid from the mixer is fed to another pump to increase the pressure back to 15MPa which is then fed back to the boiler to complete the cycle. For this problem, assume that there are negligible kinetic energy changes. A. Draw the block flow diagram of the process. B. Determine the specific enthalpies of all streams C. Calculate the mass flowrate of steam flowing through the second turbine

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A boiler takes in pressurized water at 187.96°C(Psat = 1.2MPA) and 13 MPa (stream 1) to produce 570°C steam (Stream 2) at constant pressure. The steam produced from this boiler is to be split such that they enter two separate turbines. The first turbine discharges the steam to 1.2MPa and 230°C (stream 3), while the second turbine which produces work at a rate of 1989 kW discharges 90% quality steam at 22kPa (stream 4). The discharge of the second turbine is then fed to a condenser where all the steam is fully condensed (stream 5) at constant pressure. This condensed stream is fed to a pump where the pressure is increased to 1.2 MPa (stream 6) at constant temperature. The first turbine discharge (stream 3) and the pumped liquid (stream 6) are then mixed in a ratio such that the product of the mixer is saturated liquid at 1.2MPA (stream 7) (assume no heat losses in the mixer). This saturated liquid from the mixer is fed to another pump to increase the pressure back to 15MPA which is then fed back to the boiler to complete the cycle. For this problem, assume that there are negligible kinetic energy changes. A. Draw the block flow diagram of the process. B. Determine the specific enthalpies of all streams C. Calculate the mass flowrate of steam flowing through the second turbine D. Calculate the mass flowrate of water flowing through the boiler E. Calculate the work produced by the first turbine. F. Calculate the rate of heat added to the boiler in MW. G. Calculate the rate of heat removal of the condenser in MW.
Transcribed Image Text:A boiler takes in pressurized water at 187.96°C(Psat = 1.2MPA) and 13 MPa (stream 1) to produce 570°C steam (Stream 2) at constant pressure. The steam produced from this boiler is to be split such that they enter two separate turbines. The first turbine discharges the steam to 1.2MPa and 230°C (stream 3), while the second turbine which produces work at a rate of 1989 kW discharges 90% quality steam at 22kPa (stream 4). The discharge of the second turbine is then fed to a condenser where all the steam is fully condensed (stream 5) at constant pressure. This condensed stream is fed to a pump where the pressure is increased to 1.2 MPa (stream 6) at constant temperature. The first turbine discharge (stream 3) and the pumped liquid (stream 6) are then mixed in a ratio such that the product of the mixer is saturated liquid at 1.2MPA (stream 7) (assume no heat losses in the mixer). This saturated liquid from the mixer is fed to another pump to increase the pressure back to 15MPA which is then fed back to the boiler to complete the cycle. For this problem, assume that there are negligible kinetic energy changes. A. Draw the block flow diagram of the process. B. Determine the specific enthalpies of all streams C. Calculate the mass flowrate of steam flowing through the second turbine D. Calculate the mass flowrate of water flowing through the boiler E. Calculate the work produced by the first turbine. F. Calculate the rate of heat added to the boiler in MW. G. Calculate the rate of heat removal of the condenser in MW.
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