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首页> 外文期刊>Fuel >Mobilisation of trace elements from as-supplied and additionally cleaned coal: Predictions for Ba, Be, Cd, Co, Mo, Nb, Sb, V and W
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Mobilisation of trace elements from as-supplied and additionally cleaned coal: Predictions for Ba, Be, Cd, Co, Mo, Nb, Sb, V and W

机译：从供应后的煤和另外净化的煤中动员微量元素：预测Ba，Be，Cd，Co，Mo，Nb，Sb，V和W

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摘要

The partitioning of the elements antimony, barium, beryllium, cadmium, cobalt, molybdenum and vanadium between the products of combustion of coals containing them burnt as pulverised fuel in excess air has been modelled using the MTDATA thermodynamic equilibrium package with data from the MTOX silicate melt model added to the standard database and trace element data added where necessary. The coals examined were Gascoigne Wood, ElCerrejon and Harworth coals as normally supplied (washed) and after additional washing, and Binungan low ash coal only as normally supplied, represented by the analyses for coal, coal mineral and trace elements obtained in a study of the partitioning carried out in a pilot scale pf combustor by PwerGen on behalf of the United Kingdom DTI. Excess air levels were 1% for all coals and 3% in addition for Harworth. The equilibrium amount of silicate melt was predicted to fall more rapidly with falling temperature for additionally washed than for normally washed coals. It was also predicted that Ba and Co would be almost immobile, Be and V would be relatively immobile, and Sb, Cd and Mo would be mobile. Additional calculations were carried out for niobium and tungsten as trace elements in the coals, and Nb was found to be relatively immobile and W mobile. The mobilities of Ba, Be, Co, Cd, Mo, Sb and V were in agreement with those implied by the ratio of bottom ash to fly ash concentrations found in experimental investigation.
机译：使用MTDATA热力学平衡软件包对MTOX硅酸盐熔体的数据进行了建模，其中将锑，钡，铍，镉，钴，钼和钒中的元素燃烧成粉状燃料，这些煤在过量空气中作为粉状燃料燃烧，在这些燃烧产物之间进行分配将模型添加到标准数据库，并在必要时添加跟踪元素数据。所检查的煤为正常供应（洗涤）和额外洗涤后的加斯科尼木材，ElCerrejon和Harworth煤，以及仅作为正常供应的Binungan低灰分煤，由对煤，煤矿物和微量元素的分析得出。 PwerGen代表英国DTI在中试pf燃烧器中进行了分区。所有煤炭的过量空气水平为1％，Harworth则为3％。预测与常规洗涤的煤相比，额外洗涤的硅酸盐熔体的平衡量会随着温度的下降而更快地下降。还可以预测，Ba和Co几乎不移动，Be和V相对不移动，而Sb，Cd和Mo可以移动。还对煤中的痕量元素铌和钨进行了额外的计算，发现Nb相对不易移动，而W相对不易移动。 Ba，Be，Co，Cd，Mo，Sb和V的迁移率与实验研究中发现的底灰与粉煤灰浓度之比所暗示的迁移率一致。

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