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

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Presentation transcript:

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

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

BWRHP-BWR Feed water temperature K Outlet void temperature599 0 K K Pressure in the steam dome7 MPa15.5 MPa Inlet temperature to the core K K Inlet core quality-3.909E Outlet quality from the core Total Mass Flow Rate from the core [kg/s]5955 [kg/s] Total Mass Flow Rate in the steam lines1795 [kg/s]2026 [kg/s] Total Mass Flow Rate through the pumps13634 [kg/s]5955 [kg/s] Total Power Coefficient-1.64e-4[Δk/%]-4.4e-4Δk/%

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.

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.

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

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

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

Gas to Liquid Heat Exchange Liquid Heating

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. T hot gas,in T cold steam,in T hot gas,out T cold steam,out

T hot gas,in T cold steam,in T hot gas,out T cold steam,out T hot gas,in T cold steam,in T hot gas,out T cold steam,out

Log Mean Temperature Difference Rate of Heat Transfer U Overall Heat Transfer Coefficient, kW/m 2.K

Impact cycle on Construction of Steam Generator

Steam Generator : Water Wall Furnace