1. Recent Developments in Reheat Rankine Cycle BY P M V Subbarao Professor Mechanical Engineering Department I I T Delhi New Efforts to Realize Isothermal Heat Addition…..

2. Progress in Rankine Cycle Year 1907 19191938195019581959196619731975 MW52030601202005006601300 p,MPa1.31.44.16.210.316.215.9 24.1 T h o C260316454482538566 565538 T r o C-- 538 566565538 FHW--23466788 Pc,kPa13.55.14.53.43.7 4.45.45.1 ,% --~1727.630.535.637.539.839.540

3. Reheating : A Means to implement High Live Steam Pressure Improvement in Efficiency, % 593/621 0 C 593/593 0 C 565/593 0 C 565/565 0 C 538/565 0 C 538/538 0 C Supercritical

4. Modular Construction of Steam Turbine

5. Super Critical Cycle ~ 1990

6. Single-Reheat Ultrasupercritical Product Line GE Power

7. Modular High-Temperature Gas-Cooled Reactor

8. Modular High-Temperature Gas-Cooled Reactor with Supercritical Rankine Cycle

9. Model – 2 :MHTGR

10. Special Features SG for the Life Steam Supplier : For the selected turbine set, the feedwater temperature is 283 ° C, while the SC steam parameters at SG outlet are 25.4 MPa/571 ° C. For the helium side of SG, the inlet temperature is kept at 750 ° C to maintain 179 ° C temperature difference between the helium and the SC steam for effective heat transfer. The outlet helium temperature should be increased from 250 ° C for the standard MHTGR-250 design to 330 ° C to maintain effective heat transfer between the helium and the feedwater. Although high steam pressure and temperature involves modifications of the once-through SG and relevant pipes, no additional difficulties in design and manufacture are expected.

11. (Reheat Exchanger for Reheat Steam Supply For the selected turbine set, the steam parameters at the inlet of the reheat exchanger are 4.38 MPa/311 ° C and 4.19 MPa/569 ° C at the outlet. For the helium side of reheat exchanger, the helium temperature at both inlet and outlet should be 350 ° C/750 ° C.

12. Deployment mode of MHTGR SC plant with life steam reheat cycle

13. Double Reheat Ultra Super Critical Cycle 8

14. Improvement in Efficiency, %

15. Super Critical Cycle of Year 2005

16. Double Reheat Super Critical Plants Net efficiency on natural gas is expected to reach 49%. Net efficiency on coal is expected to reach 47%.

17. Super Critical Cycle of year 2010 > 50 %

18. Double-Reheat Ultrasupercritical Product Line GE Power