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某660MW前后墙对冲燃煤锅炉贴壁风优化方案的数值模拟

DOI: 10.13334/j.0258-8013.pcsee.2015.20.018, PP. 5265-5271

Keywords: 前后墙对冲燃煤锅炉,高温腐蚀,贴壁风布置方案,数值模拟

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Abstract:

针对某电厂660MW前后墙对冲燃煤锅炉侧墙水冷壁出现的高温腐蚀问题,提出了前后墙开孔(方案1)、侧墙开槽(方案2)以及二者组合(方案3)等3种贴壁风布置方案,并对各方案的防腐蚀效果进行了数值模拟分析。结果表明:方案1需要较多贴壁风来保证喷口射流刚性,以使O2扩散到侧墙中部的高温腐蚀区;方案2使用较少贴壁风便可在沿炉深方向的喷口附近区域取得良好的补氧效果,但贴壁风沿炉高方向的扩散范围有限,导致相当部分的高温腐蚀区无法获得O2补充;方案3吸收了前2类方案优点,其最优方案C仅用4.35%风率即使侧墙水冷壁高温腐蚀区域O2浓度基本达到2%(破坏还原性气氛所需浓度)以上,从而有效地解决了高温腐蚀问题。

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