EGNE 2303 Fall 2021
Term Project
Due: Thursday, Dec 9th @ midnight in the assignment dropbox
Power Cycle Analysis with Regenerative Feedwater Heating
You have been given (1) the specification sheet for a vapour power plant with a steam turbine, and (2) the heat flow diagram for the power plant, including regenerative feedwater heating system.
Analyze this system using the thermo-fluids concepts developed in this course to determine the following:
1. Provide a simplified schematic diagram of the power plant, including labels for each term you use in your analysis (i.e., ?turbine, hFW1, ?out)
2. ?out (in Btu/s) for each of the five turbine stages illustrated on the diagram
3. Qin (in Btu/s) for each of the four stages of regenerative feedwater heating (i.e., how much enthalpy is added to the feedwater at each of the heating stages?)
4. ?in (in Btu/s) to the boiler feed pumps
5. Thermal efficiency of the power plant as illustrated (with regenerative feedwater heating)
6. ?out (in Btu/s) for the entire turbine if there were no regenerative feedwater heating system (i.e., if no steam was removed from the turbine)
7. Thermal efficiency of the power plant if there were no regenerative feedwater heating system 8. Sketch the cycle with regenerative heating on a T-s diagram with each process clearly labeled (ie,
“turbine”, “RG1”, “RG2”, “pump”, etc.). Include a vapor dome.
? Provide clear labels and mass balances for each mass flow calculated
? For each device (turbine, pump, boiler) analyzed, state model assumptions and provide an energy balance
? Make your solutions clear and easy to follow (I will be putting in minimal effort to interpret messy or disorganized work)
Notes:
• Use system data given for normal operation at a turbine power output of 16 MW (i.e. 16,000 kW)
• “Heat content” values in the heat flow diagram represent specific enthalpy (h)
• “Heat consumption” values in spec sheet represent rate of heat flow into the boiler per kW of power produced (i.e., units are in BTU/(kw*hr))
• Feedwater (i.e., fluid flowing from the condenser to the boiler) can be assumed to be liquid at all stages
• Turbine and pump operation can be assumed to be adiabatic and internally reversible
• Changes in kinetic and potential energy can be ignored
• To calculate pump work, assume water pressure at the pump inlet is at atmospheric pressure (1 atm), and pressure at the pump outlet is the same as at the turbine inlet
• “Back pressure” means pressure at the outlet of the turbine (i.e, inlet of the condenser, or “condensation pressure”)
• Assume a fluid quality of x = 0.9 at the turbine outlet
• Data for “condensate” can be ignored (i.e, use data for “steam to condensate”) on far right side of heat flow diagram
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EGNE 2303 Autumn 2021 Project
The assignment dropbox closes at midnight on December 9th.
Thermodynamic Modeling of Regenerative Feedwater
There is a specification sheet and a heat flow diagram for a vapour power plant with a steam turbine.
Analyze this system using thermo-fluids concepts to find:
Include in your study a simplified schematic model of the power plant with labels for each term (turbine, hFW1, out).
2.?out (in Btu/s) for each of the five turbine stages shown
(i.e., how much enthalpy is added to the feedwater at each of the four heating stages?)
4. Btu/s to boiler feed pumps
Figure 5: Thermal efficiency of the generating plant (with regenerative feedwater heating)
(in Btu/s) for the entire turbine without regenerative feedwater heating (i.e., if no steam was removed from the turbine)
7. Thermal efficiency of the plant without regenerative feedwater heating 8. Draw the cycle with regenerative heating on a T-s diagram, labeling each step (ie,
“RG1”, “RG2”, “pump”, etc.) a vapor dome
? Label and mass balance each computed mass flow
? Provide an energy balance for each device (turbine, pump, boiler).
? Provide straightforward, simple solutions (I will be putting in minimal effort to interpret messy or disorganized work)
Notes:
• Use system data for typical operating at 16 MW turbine power (i.e. 16,000 kW)
• Enthalpy values are shown in the heat flow diagram (h)
For example, BTU/(kw*hr) on a spec sheet represents heat flow into the boiler per kW of power produced.
• All stages of feedwater (from condenser to boiler) are considered to be liquid.
• Turbine and pump action is adiabatic and reversible.
Potential and kinetic energy changes are neglected.
• Assume the water pressure at the pump inlet is 1 atm and the pressure at the pump exit is the same as the turbine inlet.
• “Back pressure” is the pressure at the turbine’s exit (or “condensation pressure”).
• Assume x = 0.9 at the turbine outlet
• Ignore the data for “condensate” on the far right side of the heat flow diagram.
