Highly Flexible Zero-Carbon Electricity Generation Using an Innovative Oxy-Fired Supercritical CO2 Power Cycle

2019 ◽  
Author(s):  
Charlotte Mitchell ◽  
Mathieu Lucquiaud ◽  
Vitali Avagyan ◽  
Hannah Chalmers
Keyword(s):  
Supercritical Co2 ◽  
Electricity Generation ◽  
Power Cycle ◽  
Zero Carbon

Optimal structure design of supercritical CO2 power cycle for gas turbine waste heat recovery: A superstructure method

2021 ◽  
Vol 198 ◽  
pp. 117515
Author(s):  
Chendi Yang ◽  
Yuanyuan Deng ◽  
Ning Zhang ◽  
Xiaopeng Zhang ◽  
Gaohong He ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Supercritical Co2 ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Structure Design ◽  
Optimal Structure ◽  
Power Cycle

Control of a Supercritical CO2 Recompression Brayton Cycle Demonstration Loop

2013 ◽  
Author(s):  
T. Conboy ◽  
J. Pasch ◽  
D. Fleming
Keyword(s):  
Supercritical Co2 ◽  
High Efficiency ◽  
Power Conversion ◽  
Department Of Energy ◽  
Test Facility ◽  
Attractive Alternative ◽  
Commercial Development ◽  
Power Cycle ◽  
Test Loop ◽  
Recompression Cycle

The US Department of Energy is currently focused on the development of next-generation nuclear power reactors, with an eye towards improved efficiency and reduced capital cost. To this end, reactors using a closed-Brayton power conversion cycle have been proposed as an attractive alternative to steam turbines. The supercritical-CO2 recompression cycle has been identified as a leading candidate for this application as it can achieve high efficiency at relatively low operating temperatures with extremely compact turbomachinery. Sandia National Laboratories has been a leader in hardware and component development for the supercritical-CO2 cycle. With contractor Barber-Nichols Inc, Sandia has constructed a megawatt-class S-CO2 cycle test-loop to investigate the key areas of technological uncertainty for this power cycle, and to confirm model estimates of advantageous thermodynamic performance. Until recently, much of the work has centered on the simple S-CO2 cycle — a recuperated Brayton loop with a single turbine and compressor. However work has recently progressed to a recompression cycle with split-shaft turbo-alternator-compressors, unlocking the potential for much greater efficiency power conversion, but introducing greater complexity in control operations. The following sections use testing experience to frame control actions made by test loop operators in bringing the recompression cycle from cold startup conditions through transition to power generation on both turbines, to the desired test conditions, and finally to a safe shutdown. During this process, considerations regarding turbocompressor thrust state, CO2 thermodynamic state at the compressor inlet, compressor surge and stall, turbine u/c ratio, and numerous other factors must be taken into account. The development of these procedures on the Sandia test facility has greatly reduced the risk to industry in commercial development of the S-CO2 power cycle.

Optimal design of supercritical CO2 power cycle for next generation nuclear power conversion systems

2018 ◽  
Vol 108 ◽  
pp. 111-121 ◽  
Author(s):  
Zhangpeng Guo ◽  
Yang Zhao ◽  
Yaoxuan Zhu ◽  
Fenglei Niu ◽  
Daogang Lu
Keyword(s):  
Optimal Design ◽  
Supercritical Co2 ◽  
Nuclear Power ◽  
Power Conversion ◽  
Next Generation ◽  
Power Cycle

High-Temperature Oxidation of Commercial Alloys in Supercritical CO2 and Related Power Cycle Environments

JOM ◽  
2018 ◽  
Vol 70 (8) ◽  
pp. 1527-1534 ◽  
Author(s):  
Richard P. Oleksak ◽  
Joseph H. Tylczak ◽  
Casey S. Carney ◽  
Gordon R. Holcomb ◽  
Ömer N. Doğan
Keyword(s):  
High Temperature ◽  
Supercritical Co2 ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
Power Cycle

A Comparison Study for Off-Design Performance Prediction of a Supercritical CO2 Compressor With Similitude Analysis

2019 ◽  
Author(s):  
Yongju Jeong ◽  
Seongmin Son ◽  
Seong kuk Cho ◽  
Seungjoon Baik ◽  
Jeong Ik Lee
Keyword(s):  
Critical Point ◽  
Supercritical Co2 ◽  
Power Plants ◽  
Cycle Performance ◽  
Working Fluid ◽  
Brayton Cycle ◽  
Power Cycle ◽  
Design Performance ◽  
Wide Range ◽  
Phase Fluid

Abstract Most of the power plants operating nowadays mainly have adopted a steam Rankine cycle or a gas Brayton cycle. To devise a better power conversion cycle, various approaches were taken by researchers and one of the examples is an S-CO2 (supercritical CO2) power cycle. Over the past decades, the S-CO2 power cycle was invented and studied. Eventually the cycle was successful for attracting attentions from a wide range of applications. Basically, an S-CO2 power cycle is a variation of a gas Brayton cycle. In contrast to the fact that an ordinary Brayton cycle operates with a gas phase fluid, the S-CO2 power cycle operates with a supercritical phase fluid, where temperatures and pressures of working fluid are above the critical point. Many advantages of S-CO2 power cycle are rooted from its novel characteristics. Particularly, a compressor in an S-CO2 power cycle operates near the critical point, where the compressibility is greatly reduced. Since the S-CO2 power cycle greatly benefits from the reduced compression work, an S-CO2 compressor prediction under off-design condition has a huge impact on overall cycle performance. When off-design operations of a power cycle are considered, the compressor performance needs to be specified. One of the approaches for a compressor off-design performance evaluation is to use the correction methods based on similitude analysis. However, there are several approaches for deriving the equivalent conditions but none of the approaches has been thoroughly examined for S-CO2 conditions based on data. The purpose of this paper is comparing these correction models to identify the best fitted approach, in order to predict a compressor off-design operation performance more accurately from limited amount of information. Each correction method was applied to two sets of data, SCEIL experiment data and 1D turbomachinery code off-design prediction code generated data, and evaluated in this paper.

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