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水蒸气与添加剂对生物质再燃/高级再燃脱硝特性的影响

DOI: 10.13334/j.0258-8013.pcsee.2014.11.006, PP. 1755-1761

Keywords: 生物质,再燃,高级再燃,脱硝,水蒸气,添加剂

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Abstract:

以稻壳和氨气还原剂为对象,利用携带流脱硝试验装置,研究了再燃区反应温度(T2)、再燃区化学计量比(SR2)、水蒸气含量、添加剂种类与浓度等对生物质再燃/高级再燃脱硝效果的影响。结果表明:随着T2升高,生物质再燃与高级再燃的脱硝效率呈现不同的趋势,高级再燃下脱硝效率呈现先上升后下降再趋于稳定的趋势,其相应的脱硝窗口温度为950~1100℃。随着SR2降低,稻壳再燃脱硝效率逐渐升高,而高级再燃脱硝效率先增加后降低,最佳SR2在0.7~0.9之间。随着水蒸气含量增加,生物质再燃/高级再燃脱硝效率均呈现先增加后降低的趋势,水蒸气量为4%左右时脱硝效率最佳。添加剂对生物质再燃/高级再燃脱硝均有一定的促进作用,其中Fe2O3促进作用最为显著,NaOH和Na2CO3次之,KCl和Ca(OH)2的促进作用较差。添加剂浓度(50~150μmol/mol)对脱硝效率的影响不显著,水蒸气与添加剂耦合可显著增加生物质再燃/高级再燃脱硝效率;与无水蒸气和无添加剂相比,4%水蒸气含量与100μmol/molNa2CO3耦合作用的再燃/高级再燃脱硝效率分别提高13.5%与11.4%。

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