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Title: Status Report on the High-Temperature Steam Electrolysis Plant Model Developed in the Modelica Framework (FY17)

Abstract

This report has been prepared as part of an effort to design and build a modeling and simulation (M&S) framework to assess the economic viability of a nuclear-renewable hybrid energy system (N-R HES). In order to facilitate dynamic M&S of such an integrated system, research groups in multiple national laboratories have been developing various subsystems as dynamic physics-based components using the Modelica programming language. In fiscal year 2015 (FY15), Idaho National Laboratory (INL) performed a dynamic analysis of two region-specific N-R HES configurations, including the gas-to-liquid (natural gas to Fischer-Tropsch synthetic fuel) and brackish water reverse osmosis desalination plants as industrial processes. In FY16, INL developed two additional subsystems in the Modelica framework: (1) a high-temperature steam electrolysis (HTSE) plant as a high priority industrial plant to be integrated with a light water reactor (LWR) within an N-R HES and (2) a gas turbine power plant as a secondary energy supply. In FY17, five new components (i.e., a feedwater pump, a multi-stage compression system, a sweep-gas turbine, flow control valves, and pressure control valves) have been incorporated into the HTSE system proposed in FY16, aiming to better realistically characterize all key components of concern. Special attention has been given tomore » the controller settings based on process models (i.e., direct synthesis method), aiming to improve process dynamics and controllability. A dynamic performance analysis of the improved LWR/HTSE integration case was carried out to evaluate the technical feasibility (load-following capability) and safety of such a system operating under highly variable conditions requiring flexible output. The analysis (evaluated in terms of the step response) clearly shows that the FY17 model resulted in superior output responses with much smaller settling times and less oscillatory behavior in response to disturbances in the electric load than those observed with the FY16 model. Simulation results involving several case studies show that the suggested control scheme could maintain the controlled variables (including the steam utilization factor, cathode stream inlet composition, and temperatures and pressures of the process streams at various locations) within desired limits under various plant operating conditions. The results also indicate that the proposed HTSE plant could provide operational flexibility to participate in energy management at the utility scale by dynamically optimizing the use of excess plant capacity within an N-R HES.« less

Authors:
 [1];  [1];  [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1408745
Report Number(s):
INL/EXT-17-43056
TRN: US1900671
DOE Contract Number:  
AC07-05ID14517
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 13 HYDRO ENERGY; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; DESALINATION PLANTS; WATER MODERATED REACTORS; ELECTROLYSIS; ELECTRIC UTILITIES; SYNTHETIC FUELS; GAS TURBINE POWER PLANTS; ENERGY MANAGEMENT; Flexible Load Resource; High-Temperature Steam Electrolysis; Hydrogen; Nuclear-Renewable Hybrid Energy System; Solid Oxide Electrolysis Cell

Citation Formats

Kim, Jong Suk, Bragg-Sitton, Shannon M., and Boardman, Richard D. Status Report on the High-Temperature Steam Electrolysis Plant Model Developed in the Modelica Framework (FY17). United States: N. p., 2017. Web. doi:10.2172/1408745.
Kim, Jong Suk, Bragg-Sitton, Shannon M., & Boardman, Richard D. Status Report on the High-Temperature Steam Electrolysis Plant Model Developed in the Modelica Framework (FY17). United States. doi:10.2172/1408745.
Kim, Jong Suk, Bragg-Sitton, Shannon M., and Boardman, Richard D. Tue . "Status Report on the High-Temperature Steam Electrolysis Plant Model Developed in the Modelica Framework (FY17)". United States. doi:10.2172/1408745. https://www.osti.gov/servlets/purl/1408745.
@article{osti_1408745,
title = {Status Report on the High-Temperature Steam Electrolysis Plant Model Developed in the Modelica Framework (FY17)},
author = {Kim, Jong Suk and Bragg-Sitton, Shannon M. and Boardman, Richard D.},
abstractNote = {This report has been prepared as part of an effort to design and build a modeling and simulation (M&S) framework to assess the economic viability of a nuclear-renewable hybrid energy system (N-R HES). In order to facilitate dynamic M&S of such an integrated system, research groups in multiple national laboratories have been developing various subsystems as dynamic physics-based components using the Modelica programming language. In fiscal year 2015 (FY15), Idaho National Laboratory (INL) performed a dynamic analysis of two region-specific N-R HES configurations, including the gas-to-liquid (natural gas to Fischer-Tropsch synthetic fuel) and brackish water reverse osmosis desalination plants as industrial processes. In FY16, INL developed two additional subsystems in the Modelica framework: (1) a high-temperature steam electrolysis (HTSE) plant as a high priority industrial plant to be integrated with a light water reactor (LWR) within an N-R HES and (2) a gas turbine power plant as a secondary energy supply. In FY17, five new components (i.e., a feedwater pump, a multi-stage compression system, a sweep-gas turbine, flow control valves, and pressure control valves) have been incorporated into the HTSE system proposed in FY16, aiming to better realistically characterize all key components of concern. Special attention has been given to the controller settings based on process models (i.e., direct synthesis method), aiming to improve process dynamics and controllability. A dynamic performance analysis of the improved LWR/HTSE integration case was carried out to evaluate the technical feasibility (load-following capability) and safety of such a system operating under highly variable conditions requiring flexible output. The analysis (evaluated in terms of the step response) clearly shows that the FY17 model resulted in superior output responses with much smaller settling times and less oscillatory behavior in response to disturbances in the electric load than those observed with the FY16 model. Simulation results involving several case studies show that the suggested control scheme could maintain the controlled variables (including the steam utilization factor, cathode stream inlet composition, and temperatures and pressures of the process streams at various locations) within desired limits under various plant operating conditions. The results also indicate that the proposed HTSE plant could provide operational flexibility to participate in energy management at the utility scale by dynamically optimizing the use of excess plant capacity within an N-R HES.},
doi = {10.2172/1408745},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {8}
}