Numerical investigation on H2S formation in a pulverized coal-fired boiler using recycled flue gas as near-wall air

Jie Liu, Lele Feng, Yuxin Wu, Renhai Feng, Shukuan Chen and Dongqiang Zhao

Energy, 2024, vol. 313, issue C

Abstract: High-temperature corrosion (HTC) of the water-wall is becoming one of the most serious problems that cause forced outages in all types of boilers. Near-wall air (NWA) has been proven as an effective method to constrain H2S formation near the water-wall and thus prevent HTC. In this paper, a new technology that using recirculated flue gas as near wall air (NWRFG) was proposed. A three-dimensional CFD numerical model of 600 MW opposed coal-fired boiler considering H2S formation mechanism was established and validated by the in-situ test results. The effect of NWA types on the combustion characteristics and reduction atmosphere profile in the boiler were investigated under boiler maximum continue rate (BMCR) and 50 % turbine heat acceptance (THA) loads. The results show that both NWA and NWRFG can effectively reduce the H2S generation in the near wall area under BMCR and 50 % THA loads. Lower H2S concentration near the near-wall gas inlet was achieved when the NWA was adopted, while the temperature near the near-wall gas inlet is increased significantly. For NWRFG case, both H2S concentration and temperature can be decreased near the near-wall gas inlet. The reason for this discrepancy is NWA decreases the reduction atmosphere through oxidation with reducing gas. Meanwhile, the NWRFG decreases the reduction atmosphere through the dilution effect. The comparison proves that NWRFG can achieve a satisfactoryr effect in reducing HTC, comparable to NWA, while keep a deep reduction of NOx.

Keywords: Coal-fired boiler; Hight temperature corrosion; H2S formation; Near-wall air; Recirculated flue gas (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:313:y:2024:i:c:s0360544224039124

DOI: 10.1016/j.energy.2024.134134

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