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6. A steam power plant operatess on the reheat-regenerative Rankine cycle with a closed feedwater heater (FWH)as shown in the Fig. 3 Steam enters the turbine at 12.5 MPa and 550 °C at a rate of 24 kg/s and is condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550 oC. Some steam is extracted from the low-pressure turbine at 1.0 MPa, is completely condensed in the closed FWH, and pumped to 12.5 MPa, is before it mixes with the feedwater at the same pressure. Assuming an isentropic efficiency of 88 % for both the turbine and pump, determine the following: (a) the temperature of the steam at the inlet of the CFWH, (b) the mass flow rate of the steam extracted from the turbine for the CFWH, (c) the net power output, and (d) the thermal efficiency Hints: (a) In CFWH, feedwater is heated to the saturation temperature at the feedwater heater pressure, i.e.,T10 Tsat at ps (b) р2 %3D P10 %3Dрi1 %3D рд 3D 12.5 MPа (c) CFWH can handle two different fluids streams at different pressure level 3 of 4 Low-P turbine High-P turbine Boiler Closed FWH Mixing chamber Condenser PII Figure 3: An Steam power plant

6. A steam power plant operatess on the reheat-regenerative Rankine cycle with a closed feedwater heater (FWH)as shown in the Fig. 3 Steam enters the turbine at 12.5 MPa and 550 °C at a rate of 24 kg/s and is condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550 oC. Some steam is extracted from the low-pressure turbine at 1.0 MPa, is completely condensed in the closed FWH, and pumped to 12.5 MPa, is before it mixes with the feedwater at the same pressure. Assuming an isentropic efficiency of 88 % for both the turbine and pump, determine the following: (a) the temperature of the steam at the inlet of the CFWH, (b) the mass flow rate of the steam extracted from the turbine for the CFWH, (c) the net power output, and (d) the thermal efficiency Hints: (a) In CFWH, feedwater is heated to the saturation temperature at the feedwater heater pressure, i.e.,T10 Tsat at ps (b) р2 %3D P10 %3Dрi1 %3D рд 3D 12.5 MPа (c) CFWH can handle two different fluids streams at different pressure level 3 of 4 Low-P turbine High-P turbine Boiler Closed FWH Mixing chamber Condenser PII Figure 3: An Steam power plant

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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6. A steam power plant operatess on the reheat-regenerative Rankine cycle with a closed feedwater heater (FWH)as shown in the Fig. 3 Steam enters the turbine at 12.5 MPa and 550 °C at a rate of 24 kg/s and is condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550 oC. Some steam is extracted from the low-pressure turbine at 1.0 MPa, is completely condensed in the closed FWH, and pumped to 12.5 MPa, is before it mixes with the feedwater at the same pressure. Assuming an isentropic efficiency of 88 % for both the turbine and pump, determine the following: (a) the temperature of the steam at the inlet of the CFWH, (b) the mass flow rate of the steam extracted from the turbine for the CFWH, (c) the net power output, and (d) the thermal efficiency Hints: (a) In CFWH, feedwater is heated to the saturation temperature at the feedwater heater pressure, i.e.,T10 Tsat at ps (b) р2 %3D P10 %3Dрi1 %3D рд 3D 12.5 MPа (c) CFWH can handle two different fluids streams at different pressure level 3 of 4 Low-P turbine High-P turbine Boiler Closed FWH Mixing chamber Condenser PII Figure 3: An Steam power plant
Transcribed Image Text:6. A steam power plant operatess on the reheat-regenerative Rankine cycle with a closed feedwater heater (FWH)as shown in the Fig. 3 Steam enters the turbine at 12.5 MPa and 550 °C at a rate of 24 kg/s and is condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550 oC. Some steam is extracted from the low-pressure turbine at 1.0 MPa, is completely condensed in the closed FWH, and pumped to 12.5 MPa, is before it mixes with the feedwater at the same pressure. Assuming an isentropic efficiency of 88 % for both the turbine and pump, determine the following: (a) the temperature of the steam at the inlet of the CFWH, (b) the mass flow rate of the steam extracted from the turbine for the CFWH, (c) the net power output, and (d) the thermal efficiency Hints: (a) In CFWH, feedwater is heated to the saturation temperature at the feedwater heater pressure, i.e.,T10 Tsat at ps (b) р2 %3D P10 %3Dрi1 %3D рд 3D 12.5 MPа (c) CFWH can handle two different fluids streams at different pressure level 3 of 4 Low-P turbine High-P turbine Boiler Closed FWH Mixing chamber Condenser PII Figure 3: An Steam power plant
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