1 / 15

Selection of Rankine Cycles for Various Resources

Selection of Rankine Cycles for Various Resources. P M V Subbarao Professor Mechanical Engineering Department. Match the Cycle and Resource …. Improved thermal efficiency, feeding the turbine with ~340 °C (15 MPa) steam instead of ~285 °C   (7MPa) . Thermohydraulic considerations.

orli
Télécharger la présentation

Selection of Rankine Cycles for Various Resources

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Selection of Rankine Cycles for Various Resources P M V Subbarao Professor Mechanical Engineering Department Match the Cycle and Resource …

  2. Improved thermal efficiency, feeding the turbine with ~340 °C (15 MPa) steam instead of ~285 °C   (7MPa)

  3. Thermohydraulic considerations • A thermal design criterion for a PWR reactor core is the limit of the fuel temperature (melting point of UO2 about 2800 °C), being the design temperatures 2000 °C at rated power and 2350 °C at a maximum linear fuel rating of 54 kW/m. • According to this criterion, recent PWR cores have an average linear fuel rating of 17.9 kW/m and maximum linear fuel rating of 44 kW/m. For a BWR, the maximum allowable temperature at the center of a fuel rod is 2500 °C in an emergency and 1850 °C during normal operation .

  4. Thermohydraulic considerations • Following this criterion, a HP-BWR with a thermal power of ~2700 MW, and an electrical power output of ~1000 MW, may have a core with an average linear fuel rating of 13.6 kW/m and a maximum linear fuel rating of 44 kW/m. • Without any fuel modifications, the temperature at the center of a fuel rod during normal operation is slightly higher and has been estimated to be 1885 °C. • The maximum temperature of the Zircaloy-2 fuel cladding is around 491 °C, which is lower than the allowed maximum temperature of 550 °C.

  5. Hardware Modifications for Creation of Better Cycle Conditions Fossil Fuel Based Systems

  6. Role of SG in Rankine Cycle Using Natural resources of energy.

  7. Hot Flue Gas Thermal Structure SH Steam Rise in Enthalpy of Steam Convection HT Drop in Enthalpy of Flue Gas Convection & Radiation HT Mechanism of Heat Transfer Thermal Structure Sink /Demand Source/Supply Phenomenological Model

  8. Gas to Liquid Heat Exchange Liquid Heating

  9. Thot gas,in Thot gas,out Tcold steam,out Tcold steam,in Mechanism of Heat Transfer :Generalized Newton’s Law of Cooling • Rate of heat transfer from hot gas to cold steam is proportional to: • Surface area of heat transfer • Mean Temperature difference between Hot Gas and Cold Steam.

  10. Thot gas,in Thot gas,out Tcold steam,out Tcold steam,in Thot gas,in Thot gas,out Tcold steam,out Tcold steam,in

  11. Log Mean Temperature Difference • Rate of Heat Transfer • U Overall Heat Transfer Coefficient, kW/m2.K

  12. Impact cycle on Construction of Steam Generator

  13. Steam Generator : Water Wall Furnace

More Related