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Quality of deposits during grate combustion of corn stover and wood chip blends

机译：玉米秸秆和木屑混合物的炉rate燃烧过程中的沉积物质量

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摘要

There is need to increase efficiency of electricity production in grate combustion (GC). This will lead, however, to higher steam temperatures and make superheaters more susceptible to corrosion. Corn stover (CS) is one of the most abundant agro-biomass residues available to energy production on a global scale and GC power plants are best suited to its combustion. The focus in this study was the quality of deposits during GC of CS blended with wood chips. CS is a difficult fuel at least due to its high chlorine content (up to 1 wt%). After a thorough fuel analysis (also with wheat straw, for comparison), combustion tests were conducted with a 100kW grate reactor, where gas temperature versus residence time can resemble that in a full scale GC power plant furnace. Flue gas composition, alkali chloride mass flow, mass deposition, and deposition of chlorine and other key elements at critical positions of two superheater simulators were measured. Corrosivity of deposit, if estimated only from the maximum chlorine concentration found in deposits, reached maximum already with 20 ± 3% portion of CS on energy basis (which was the lowest portion of CS in the tests). However, further increase of the portion of CS in the blend was found to increase the overall mass deposition and also Cl mass deposition through this way. Because corrosion reactions consume elemental chlorine, the corrosivity (metal loss) at superheater area can increase as a function of CS portion in range >20% CS. Ash problems found on the grate were mostly due to the high mineral content in CS. These minerals originated mainly from the soil (during the harvesting stage), which led to higher ash melting temperatures compared to wheat straw ash.
机译：需要提高炉排燃烧（GC）中的发电效率。但是，这将导致蒸汽温度升高，并使过热器更容易受到腐蚀。玉米秸秆（CS）是全球可用于能源生产的最丰富的农业生物质残渣之一，而气相色谱发电厂最适合于其燃烧。这项研究的重点是在CS混合木屑的GC期间沉积物的质量。 CS至少是由于其高氯含量（高达1 wt％）而成为困难的燃料。经过彻底的燃料分析（也使用小麦秸秆进行比较）后，使用100kW炉排反应器进行了燃烧测试，其中气体温度与停留时间的关系类似于全规模GC电厂炉中的温度。测量了两个过热模拟器的关键位置处的烟气成分，碱金属氯化物质量流量，质量沉积以及氯和其他关键元素的沉积。如果仅从沉积物中发现的最大氯浓度估算沉积物的腐蚀性，则其能量就已经达到最大值，以能量为基准，CS的含量为20±3％（这是测试中CS的最低部分）。但是，发现通过这种方式进一步增加共混物中CS的比例会增加整体质量沉积以及Cl的质量沉积。由于腐蚀反应会消耗元素氯，因此在> 20％CS的范围内，过热器区域的腐蚀性（金属损失）会随CS部分的增加而增加。炉排上发现的灰烬问题主要是由于CS中的矿物质含量高。这些矿物质主要来自土壤（在收获阶段），与小麦秸秆灰相比，灰熔点更高。

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  • 来源
    《Fuel》 |2013年第2期|476-487|共12页
  • 作者

    Martti Aho; Kari Paakkinen; Raili Taipale;

  • 作者单位

    VTT Technical Research Centre of Finland, P.O. Box 1603, Fl-40101 Iyvaskvlae, Finland;

    VTT Technical Research Centre of Finland, P.O. Box 1603, Fl-40101 Iyvaskvlae, Finland;

    VTT Technical Research Centre of Finland, P.O. Box 1603, Fl-40101 Iyvaskvlae, Finland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    grate combustion; biomass; deposits; corrosion;

    机译：炉排燃烧生物质存款;腐蚀;

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