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Effects of Alkali Metals and Chlorine on Corrosion of Super Heater Tube in Biomass Circulating Fluidized Bed Boiler

순환유동층보일러의 과열기 튜브 부식에 알칼리 금속과 염소가 미치는 영향

  • Received : 2016.10.19
  • Accepted : 2016.11.24
  • Published : 2017.02.10

Abstract

This study provides the identification of corrosion cause substances in super heater tube from a commercial scale circulating fluidized bed boiler. Electricity is produced by the combustion of biomass mainly wood waste. The biomass, super heater tube, super heater tube ash, and boiler ash were collected and components associated with corrosion were analyzed. A large amount of oxygen-containing material was found due to oxidation. The chlorine content was analyzed as 6.1% and 4.3% in super heater tube ash and boiler ash respectively which were approximately 20 and 14 times higher than those of designed values. Also, alkaline metal contents (K, Na, Ca) were very high in ash samples collected from super heater tube and boiler. The tendency of slagging and fouling was predicted based on X-Ray Fluorescence (XRF) results. Basicity that can lead to slagging was estimated as 3.62 and 2.72 in super heater tube and boiler ash, respectively. Slagging would occur with ash content when considering the designed value as 0.35.

Keywords

corrosion;circulating fluidized bed boiler;biomass;alkaline metal;chlorine

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Acknowledgement

Supported by : 환경부