Fouling Tendency of Ash Resulting From Burning Mixtures of Biofuels
Fouling Tendency of Ash Resulting From Burning Mixtures of Biofuels
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DOI：
10.1115/fbc2005-78019
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Theis;B. Skrifvars;M. Hupa;H. Tran
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文献类型：
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作者：
M. Theis;B. Skrifvars;M. Hupa;H. Tran
泥炭与树皮和泥炭与秸秆的指定混合物在实验室规模的气流床反应器中燃烧，该反应器模拟生物质燃烧锅炉过热器区域的条件。将沉积物收集在空气冷却的探针上，该探针在出口处插入反应器中。对于这两种混合物，沉积行为遵循非线性模式，这表明不同燃料的灰烬之间发生了物理化学相互作用。结果表明，它是可能的燃烧高达30重量%的树皮（可再生生物燃料和纸浆厂废物）和高达70重量%的秸秆（可再生生物燃料和农业废物）与泥炭的混合物，而不会遇到增加的沉积速率在反应器中。使用化学分馏分析和SEM/EDX将存款组成与燃料灰组成进行比较。虽然从纯燃料获得的沉积物的组成类似于进料组成，但在从混合物获得的沉积物中观察到相当大的变化。K和S化合物附着在Si球和衬底表面。在燃烧之前通过洗涤和机械/热脱水去除树皮中的K、S、Cl和Na，可显著降低沉积速率。
Specified mixtures of peat with bark and peat with straw were burned in a lab-scale entrained flow reactor that simulates conditions in the superheater region of a biomass-fired boiler. Deposits were collected on an air-cooled probe that was inserted into the reactor at the outlet. For both mixtures, the deposition behaviour followed a non-linear pattern, which suggests that physico-chemical interaction between the ashes of the different fuels has taken place. The results indicate that it is possible to burn up to 30 wt-% bark (renewable biofuel and pulp mill waste) and up to 70 wt-% straw (renewable biofuel and agricultural waste) in mixtures with peat without encountering increased deposition rates in the reactor. The deposit composition was compared to the fuel ash composition using chemical fractionation analysis and SEM/EDX. While the composition of deposits obtained from pure fuels resembles the feed composition, a considerable change is observed in deposits obtained from mixtures. K and S compounds are attached to Si spheres and the substrate surface. The deposition rate is significantly lowered when removing K, S, Cl and Na in bark prior to burning by washing and mechanical/thermal dewatering.Copyright © 2005 by ASME