Sensor for measuring hydrogen partial pressure in parabolic trough power plant expansion tanks

Full-Scale Hydrogen Mitigation Installation and Testing at Nevada Solar One

“…During the first year, we identified, developed, and demonstrated a sensor that measured hydrogen partial pressure in the headspace gas of the power plant expansion tanks [12,13]. We performed extended heat loss testing of an in-service receiver that was removed from the NSO collector field [14].…”

Acciona Power Plant Hydrogen Mitigation Project

“…During the first project year, we identified, developed, and demonstrated a sensor that measures hydrogen partial pressure in the headspace gas of the power plant expansion tanks [2,3]. Using this instrument, we performed several rounds of measurements of hydrogen partial pressure over the range of 1.3 mbar to 0.0027 mbar in hydrogen and nitrogen, and in mixtures of hydrogen, nitrogen, and the HTF components -biphenyl, and diphenylether.…”

“…with KG the overall gas-side mass transfer coefficient [mol/(cm 2 The overall mass transfer coefficient KG incorporates the resistance to mass transfer on the gas-phase side of the interface as well as the liquid-side of the interface and is expressed as (Cussler, 2009)…”

Abengoa/Acciona Power Plant Hydrogen Mitigation Project (Cooperative Research and Development Final Report, CRADA Number CRD-15-583)

“…The hydrogen molar diffusion rate through the boundary layer, , is defined by: (1) where Df is the diffusion coefficient for hydrogen in the headspace gas, Amem is the membrane area, and δBL is the boundary-layer thickness, R is the gas constant, and Tgas is the gas absolute temperature. The hydrogen permeation rate through the membrane equals the diffusion rate and is defined by: (2) where ϕmem is the hydrogen permeation coefficient in the membrane and δmem is the membrane thickness. Finally, the increase in permeate pressure during the response is given by: (3) where Tperm and Vperm are the permeate gas temperature and volume.…”

“…The liquid is assumed to be a non-polar mixture of 50% biphenyl -50% diphenylether at 566.15 K and 10 bar (NSO conditions). The Wilke -Chang theory estimates the diffusion coefficient D [cm2 /s] of a solute in a dilute solution as(Wilke and Chang, 1955) [44]: factor of the solvent, M the molecular weight of the solvent [g/mol], T the absolute temperature [K], the dynamic viscosity of the solution [cp], and V the molar volume of the solute [cm 3 /mol].…”