Low-temperature ash deposition and dewpoint corrosion of a coal-fired travelling grate boiler

The low-temperature ash deposition and dewpoint corrosion of three materials were studied under six tube wall temperatures in a coal-fired travelling grate boiler. The experimental and simulation results showed that the leeward sides of the test sections were prone to suffer serious ash deposition and corrosion caused by acid condensation. The ash deposition and corrosion characteristics were different in various wall temperature ranges and the mechanisms were discussed. The corrosion resistance of the three tested materials was as follows: 316 L > ND > 20#. Recommendations were given to choose the materials for the waste heat recovery of coal-fired travelling grate boilers.