Fossil Fuels Coal, Lignite, And Peat

Mechanism of Hydrogen Formation in Solar Parabolic Trough Receivers

Authors: Moens, L. Blake, D. M.
 
Abstract: Solar parabolic trough systems for electricity production are receiving renewed attention, and new solar plants are under construction to help meet the growing demands of the power market in the Western United States. The growing solar trough industry will rely on operating experience it has gained over the last two decades. Recently, researchers found that trough plants that use organic heat transfer fluids (HTF) such as Therminol VP-1 are experiencing significant heat losses in the receiver tubes. The cause has been traced back to the accumulation of excess hydrogen gas in the vacuum annulus that surrounds the steel receiver tube, thus compromising the thermal insulation of the receiver. The hydrogen gas is formed during the thermal decomposition of the organic HTF that circulates inside the receiver loop, and the installation of hydrogen getters inside the annulus has proven to be insufficient for controlling the hydrogen build-up over the lifetime of the receivers. This paper will provide an overview of the chemical literature dealing with the thermal decomposition of diphenyl oxide and biphenyl, the two constituents of Therminol VP-1.
Publication Date: 01 Mar 2008
DOE Contract number: AC36-99-GO10337
Resource Type: Conference
Resource Relation: Conference: 2008 14th Biennial CSP SolarPACES (Solar Power and Chemical Energy Systems) Symposium, 4-7 March 2008, Las Vegas, Nevada (CD-ROM) (NREL/CD-550-42709)
Research Organizations: National Renewable Energy Laboratory (NREL), Golden, CO.
Sponsoring Organizations: USDOE
Country of Publication: United States
Language: English
Keywords relating to this report:
BIPHENYL
CONSTRUCTION
ELECTRICITY
ENERGY SYSTEMS
GETTERS
HEAT LOSSES
HEAT TRANSFER FLUIDS
HYDROGEN
LIFETIME
MARKET
OXIDES
PRODUCTION
PYROLYSIS
STEELS
THERMAL INSULATION

Subjects:
Related subjects:
BIOENERGY
CONCENTRATING SOLAR POWER
SOLARPACES 2008