350 MW对冲燃烧锅炉燃用高钠煤掺配试验及应用
Electric Power Environmental Protection（2021）
Abstract
新疆高钠煤具有强结渣,沾污特点,严重影响了锅炉的安全稳定运行,掺配低钠煤运行是一种有效的手段.通过对五彩湾高钠煤与乌东低钠煤质对比,进行五彩湾高钠煤与乌东低钠煤按照质量比为9:1、8:2、7:3、6:4、5:5掺配的煤质常规分析数据理论计算,在一维试验台上进行掺配的着火、结渣验证.最后,在350 MW对冲燃烧煤粉锅炉对制粉及燃烧系统优化摸底调整后,进行80％、60％的掺配五彩湾高钠煤实炉试验.形成结论如下:五彩湾高钠煤与乌东煤均为易着火、易燃尽煤种,混煤也是着火和燃尽性能优良,乌东低钠煤掺配比例越高,结渣性越弱;本次实炉试验中五彩湾高钠煤与乌东低钠煤质量比为8:2,混煤煤灰中氧化钠含量控制在3.57％,能够实现机组长期75％以上负荷掺配80％高钠煤的目标;针对本次试验350 MW对冲燃烧煤粉锅炉,建议采用分磨掺配方式,且前墙上层D磨作为备用磨;每个班全面吹灰一次,再根据实际情况选择性吹灰,及时排渣;运行氧量控制在3％ ～3.5％之间;同层层风开度最大偏差不大于15％.燃烧五彩湾高钠煤的过程中,可以根据实际结渣情况,进行负荷扰动来使炉膛水冷壁及过热器和再热器管壁的结渣层脱落,或者间歇性掺入低钠煤,可使炉内原有结渣脱落.
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