Novel hybrid solar tower-gas turbine combined power cycles using supercritical carbon dioxide bottoming cycles

Mohammadi, Kasra; Ellingwood, Kevin; Powell, Kody

doi:10.1016/j.applthermaleng.2020.115588

Novel hybrid solar tower-gas turbine combined power cycles using supercritical carbon dioxide bottoming cycles

Journal Article · Fri Jun 12 00:00:00 EDT 2020 · Applied Thermal Engineering

DOI:https://doi.org/10.1016/j.applthermaleng.2020.115588· OSTI ID:1864036

Mohammadi, Kasra ^[1]; Ellingwood, Kevin ^[2]; Powell, Kody ^[2]

Univ. of Utah, Salt Lake City, UT (United States); University of Utah
Univ. of Utah, Salt Lake City, UT (United States)

In this study, two novel hybrid solar power tower-gas turbine combined power cycles are proposed, in which two supercritical CO₂ (s-CO₂) power cycles connected in series are driven by waste energy from a gas turbine cycle partially driven by a solar power tower. The solar power tower system provides a high-temperature thermal energy up to 1223 K. Each of the two novel schemes consists of a combined cycle with configuration 1 combining an s-CO₂ recompression cycle and an s-CO₂ recuperative cycle as bottoming cycles. Configuration 2 replaces the recompression cycle with an s-CO₂ partial cooling cycle. Another objective is to evaluate the suitability of the two novel configurations against two conventional combined cycles including a bottoming steam Rankine cycle driven by a single-pressure heat recovery steam generator (HRSG) and dual-pressure HRSG. A thermodynamic and economic analysis is conducted for the plants, all sized at 50 MWe, and found that while configuration 1 has the lowest overall cycle efficiency of 0.4608, it exhibits the lowest levelized cost of electricity (LCOE) of $$\$$83.16$/MWh, due to its compact components. The highest overall cycle efficiency of 0.5066 is obtained for the configuration that employs a bottoming steam Rankine cycle with dual-pressure HRSG, which exhibits an LCOE of $$\$$85.08$/MWh. Transient analysis of the cycle configuration 1 further highlighted a high solar share over 0.652 during the month of June. A sensitivity analysis examined the effect of the maximum and minimum pressures and the compressor inlet temperature of the two bottoming s-CO₂ cycles, and design direct normal irradiance (DNI) on power plant performance, required field size, and LCOE. Here, the lowest LCOE of $$\$$80.90$/MWh for configuration 1 is realized when the compressor inlet temperatures approach 308 K for both s-CO₂ cycles. Increasing the design DNI levels corresponds to a significant decrease in LCOE but results in lower solar shares.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0007712

OSTI ID:: 1864036

Alternate ID(s):: OSTI ID: 1780201
OSTI ID: 1799331

Journal Information:: Applied Thermal Engineering, Journal Name: Applied Thermal Engineering Vol. 178; ISSN 1359-4311

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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