Emission of SO2 and desulfurization mechanism in 71 MWe PFBC demonstration plant

Rikiya Abe, Hiroshi Sasatsu, Tatsuro Harada, Nobuhiro Misawa, Yasujiro Tsuji, Hideki Goto

    研究成果: Contribution to journalArticle査読

    6 被引用数 (Scopus)

    抄録

    Desulfurization extent in the 71 MWe PFBC demonstration plant was analyzed in terms of operational parameters and morphology of the desulfurizing bed material. High removal level of SO2 achieved in PFBC in spite of high CO2 partial pressure was correlated not with the temperature of the bed but with the temperature of the exhaust gas (Tg), suggesting that the emission of SO2 is governed by the decomposition of CaSO4 flying out from the boiler. The residence time in the fluidized bed did not influence the level of SO2 emission, indicating the saturation of desulfurization reaction in the bed within rather short time. The sorbent particles in the bed had CaSO4 layer of 30-40 μm thickness on the surface. Since the calcium minerals produced are porous in the core as well as in the skin, such observation suggests the formation of CaO at the bottom of the furnace where the CO2 partial pressure was sufficiently low for the decomposition of CaCO3. The skin of material was eroded to expose the active surface for further desulfurization. Such CaO of sufficient amount in the bed adsorbs SO2 very rapidly to complete the desulfurization in the bed. Hence the concentration of SO2 in the flue gas is determined by the reaction CaSO4+CO→CaCO3+SO2 in the freeboard. This reaction appears in equilibrium since a fair linear correlation was observed between In (pSO2/pCO) and 1/Tg.

    本文言語英語
    ページ(範囲)57-68
    ページ数12
    ジャーナルNihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy
    79
    1
    DOI
    出版ステータス出版済み - 2000

    All Science Journal Classification (ASJC) codes

    • 再生可能エネルギー、持続可能性、環境
    • 燃料技術
    • エネルギー工学および電力技術

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