Abstract
Dryout phenomena have been experimentally investigated in a helically coiled steam generator tube. The experiences carried out in the present work are part of a wide experimental program devoted to the study of a GEN III+ innovative nuclear power plant [1].The experimental facility consists in an electrically heated AISI 316L stainless steel coiled tube. The tube is 32 meters long, 12.53 mm of inner diameter, with a coil diameter of 1m and a pitch of 0.79 m, resulting in a total height of the steam generator of 8 meters. The thermo-hydraulics conditions for dryout investigations covered a spectrum of mass fluxes between 199 and 810 kg/m2s, the pressures ranges from 10.7 to 60.7 bar, heat fluxes between 43.6 to 209.3 kW/m2.Very high first qualities dryout, between 0.72 and 0.92, were found in the range of explored conditions, comparison of our results with literature available correlations shows the difficulty in predicting high qualities dryout in helical coils., immediately following the heading. The text should be set to 1.15 line spacing. The abstract should be centred across the page, indented 15 mm from the left and right page margins and justified. It should not normally exceed 200 words.
Highlights
The experiences carried out in the present work are part of a wide experimental program devoted to the study of a GEN III+ innovative nuclear power plant [1].The experimental facility consists in an electrically heated AISI 316L stainless steel coiled tube
Coiled once-through boilers have been widely applied in the past on several power conversion systems, ranging from supercharged fossil fuelled power stations, solar power plants, stationary nuclear reactors (AGR) and one water cooled nuclear reactor for ship power propulsion (Otto Hahn)
The steam generator tube is carefully insulated with rock wool, and the small thermal losses were previously determined with dedicated experiences and the net power given to the fluid was determined as the difference between the electrical power and the thermal losses
Summary
The test matrix covered a spectrum of three nominal pressures (20, 40 and 60 bar) and four mass fluxes (200, 400, 600 and 800 kg/m2s) , resulting in a total of 12 runs for dryout occurrence investigations. I.e. the difference between saturation temperature at inlet pressure and actual inlet temperature, remained fixed at 50 °C for all the runs. Both first and last qualities dryout were investigated, no attempt were done for quantifying the degree of thermodynamic disequilibrium in the post dryout zone due to the absence of a measure of steam temperature in the post dryout region
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