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Carbon, Sulfur and Nitrogen Behavior during Pilot-Scale Testing of Oxy-Coal Combustion

机译:煤制氧燃烧中试过程中的碳,硫和氮行为

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Tests were performed in a 1.5 MW coal-fired pilot-scale furnace (L1500) to evaluate differences in carbon-in-ash, sulfur and NOx concentrations between air- and oxy-fired conditions. Results showed: 1. Carbon-in-ash was lower for oxy-combustion while firing Utah and Illinois coals and higher while firing PRB coal. 2. Sulfur in entrained ash was a linear function of calcium concentration in the mineral matter while oxy-firing. For the baghouse ash and while air firing, the ash sulfur and calcium content appeared unrelated. Analysis of the water condensate along with measurements of condensation rates indicated that sulfur removal through water condensation could be significant for this furnace. 3. Furnace NO_x concentrations were similar for air and oxy-fired conditions at burner stoichiometric ratios less than one, and much higher for oxy-fired conditions at BSRs greater than one, suggesting that recycled NO_x was reburned under substoichiometric conditions. NO_x emissions were much lower for oxy-combustion because of the lower volume of emitted flue gas.
机译:测试是在1.5 MW的燃煤中试炉(L1500)中进行的,以评估空气和氧气燃烧条件下的灰分碳,硫和NOx浓度差异。结果表明:1.燃烧犹他州和伊利诺伊州煤时,氧燃烧的灰分碳含量较低,而燃烧PRB煤时,灰分的碳含量较高。 2.夹杂灰中的硫与氧燃烧时的矿物质中钙浓度呈线性关系。对于布袋灰和空气燃烧,灰中的硫和钙含量似乎无关。对水冷凝物的分析以及冷凝速率的测量表明,通过水冷凝除去硫对于该炉而言可能是重要的。 3.在燃烧器化学计量比小于1的情况下,空气和氧气燃烧条件下的炉NO_x浓度相似,在BSR大于1的情况下,对于氧气燃烧条件下的NO_x浓度高得多,这表明再循环的NO_x在亚化学计量条件下进行了再燃烧。氧气燃烧的NO_x排放量要低得多,因为排放的烟气量较小。

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