Historical review and performance comparison of hydrogen oxyfuel steam cycles for thermal power plants considering current limitations of turbomachinery
Publication date
2023-09-28
Document type
Konferenzbeitrag
Organisational unit
Conference
ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition ; Boston, MA, USA ; June 26–30, 2023
Publisher
The American Society of Mechanical Engineers
Book title
Proceedings of the ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition.
Volume (part of multivolume book)
5
Article ID
V005T06A013
Part of the university bibliography
✅
Language
English
Abstract
To face the challenge regarding reconversion of stored green hydrogen into electricity, zero emission oxyfuel hydrogen cycles with steam as a working fluid are very promising in both thermal efficiency and large-scale applicability. Previous studies suggest that with Turbine Inlet Temperatures (TIT) of 1700 °C thermal efficiencies in excess of 70% based on Lower Heating Value (LHV) can be reached. This work starts with a historical review, from the early 80s until today, of the processes proposed in the literature which can be categorized in partly condensing and fully condensing cycles. Also, since the calculations in the literature are based on different assumptions of cycle parameters, component efficiencies and material limitations, a selection of state-of-the-art process and component parameters in the turbomachinery and power plant industry will be established to help identify the technically realizable and promising cycles. Those parameters will also be used as a common base for thermodynamic simulations of the selected cycles and can serve as a reliable reference for further calculations. The simulations show that thermal efficiencies up to 73% are achievable under conditions reflecting the present state-of-the-art and 75% in the near future, considering current development. Mitsubishi’s intercooled topping recuperation cycle shows the highest thermal efficiency with 75% based on LHV. Moreover, a higher TIT goes along with increased cooling demand and thus higher losses in the turbine, counteracting the efficiency increase due to the elevated temperature. A parametric analysis will identify the optimum operating point of each cycle regarding TIT with consideration of the cooling efficiency.
Version
Published version
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