Modeling and Simulating Diffused Aeration for Hydrogen Removal from Expansion Tanks of Parabolic Trough Solar Thermal Power Plants: Paper No. 030001

Koenraad Beckers, Gregory Glatzmaier

Research output: Contribution to conferencePaper

2 Scopus Citations

Abstract

High-temperature decomposition of organic heat transfer fluids (HTFs) can cause hydrogen build-up in the receiver annulus of parabolic trough power plants. This build-up increases the receiver thermal losses and results in a decline in power output. Prior work has shown that removal of hydrogen from the expansion tank can be an effective mitigation strategy. This paper presents a modeling methodology and simulation results for passive and diffused aeration removal of hydrogen from the expansion tank. Focus is on estimating the mass transfer of hydrogen from the HTF into the headspace gas across the surface and bubble liquid/gas interfaces. Simulations for the operation conditions and expansion tank geometry of the Nevada Solar One power plant (located near Las Vegas, Nevada, USA) show that passive removal (surface mass transfer only) may be sufficient to obtain hydrogen removal rates of 1.7 x 10-4 mol/s (minimal removal rate necessary). A diffused aeration system (surface plus bubble mass transfer) with gas injection volume rates up to 100 L/s may be necessary to obtain a hydrogen removal rate of 2.0 x 10-4 mol/s (optimal removal rate).
Original languageAmerican English
Number of pages8
DOIs
StatePublished - 2018
EventSolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile
Duration: 26 Sep 201729 Sep 2017

Conference

ConferenceSolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems
CitySantiago, Chile
Period26/09/1729/09/17

NREL Publication Number

  • NREL/CP-5500-68873

Keywords

  • CSP
  • solar
  • thermal power plants
  • trough

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