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Failure mechanism of superheater tubes of waste heat boiler for waste incineration in complex environment
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NSTL
Elsevier
In order to further understand the failure mechanism of superheater tubes of waste heat boiler in a complex environment, sample sections cut down from the failed and non-failed tubes had been investigated by using visual observation, micro-zone analysis and Stress calculation check. Results showed that S content of 15MoG slightly exceeded the standard, and the main composition of corrosion products were related to the oxygen, sulfur, chlorine, sodium, potassium, calcium. Ash samples on the failed tube and at the bottom of the furnace were analyzed by EDS and XRD. The on-site operation and shutdown of the boiler were also considered. The failure mechanism was corrosion thinning raised by high temperature oxidation corrosion, sulfide corrosion, chloride corrosion, and dew point corrosion. The prerequisite of corrosion was that corrosive medium, over-temperature operation, severe fouling deposits were present simultaneously. Measures to limit these factors which can alleviate corrosion thinning are suggested and put forward.
NSTL
Elsevier
