Taking six kinds of materials used for heating surface of ultra-supercritical boilers as the research objects

the simulated high temperature corrosion test bench was utilized to investigate the effects of SO_2 volume fraction

tube wall temperature and fluid phase on degree of corrosion. Moreover

the actual corrosion experiments were carried out on a 200 k W corrosion test bench. The results show that

the SO_2 concentration and tube wall temperature had significant influence on the corrosion degree of the heating surface

and the gas phase corrosion was much weaker than the gas-solid phase corrosion. From strong to weakness

the corrosion resistance of the 6 heating surface materials was HR3 C

TP310

domestic S30432

S30432

15 Cr Mo G and 12 Cr1 Mo VG. The 200 k W corrosion tests show that the average thickness reduction of the 6 heating surface materials were 0.03

0.04

0.14

0.18

0.91 and 1.04 mm/a when burning the coal with w(S)t

ar of 2.36%. The actual corrosion of the heating surface materials was between the gas-solid phase corrosion and the gas phase corrosion in the simulated high temperature corrosion test.