The hydrodynamics characteristics and heat transfer of internally ribbed tubes used in a 600 MW supercritical ‘W’ boiler were investigated in the range of sub-critical

near-critical and super-critical pressure.The test section of the four heads internally ribbed tubes with a diameter of Ф32 × 6.3 mm was made of 12Cr1MoVG.Based on the experiments

the characteristics of the internally ribbed tubes temperature distribution and the law of its changes with pressure

mass velocity

enthalpy of working medium were obtained in the test.Meanwhile

the correlations for calculating internal surface heat transfer coefficient were also achieved.The results will be useful for the operation of water evaporators with internally ribbed tubes in the first 600 MW supercritical ‘W’ boiler of the world.