煤灰矿物质在炉内的迁徙分布规律及其对沾污结渣的影响
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摘要: 在0.25 MW试验炉上进行热态试验，对新汶矿务局黑液水煤浆和常规水煤浆进行对比燃烧试验，从炉膛不同部位的灰渣成分分析炉内的结渣机理。研究了煤中钠、钾、钙、铝、硅、铁等矿物质元素沿烟气行程的分布，着重研究了不同成分对结渣的形成及分布的影响。结果表明，沿火焰行程，煤中各矿物质的分布是不一样的，其中碱金属质量分数炉壁渣比空间颗粒明显减小，呈先减小后增大趋势，炉壁渣的铝质量分数明显超过空间颗粒物，呈先增大后减小趋势，硅则和铝恰恰相反，使得硅铝比先增大后减小，其它各元素的附着机理也有各自的规律，其矿物质元素分布与煤灰熔融性基本一致。Abstract: Xinwen CWS (Coal-Water-Slurry) and black liquor CWS were combusted in a 0.25?MW combustion furnace, and the slag produced along the furnace was measured and analyzed to determine the distribution of mineral species such as Na, K, Ca, Al, Si and Fe. The influence of mineral species on the fusion is discussed. The result shows that the distribution is different among the mineral species along the fire in the furnace. For example, Na2O on the wall is less than that in the volume, and the distribution increases firstly, then decreases after it reaches the peak at 1 000 mm. And the distribution of some other mineral species has their own rule which is consistent with the fusibility of the coal ash.
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Key words:
- black liquor of pulp /
- CWS /
- mineral species /
- slagging /
- distribution
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