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Coal characterisation for NO_x prediction in air-staged combustion of pulverised coals

机译：煤粉空气分级燃烧中NO_x预测的煤表征

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A series of world-traded coal samples has been tested using the Imperial College high temperature wire mesh apparatus (HTWM) in order to assess the relationship between high temperature (1600 deg C) char nitrogen content and NO_x formation in Hemweg Power Station (in the Netherlands) using deep furnace air staging. A linear relationship between high temperature char nitrogen and NO_x formation has been confirmed. These results suggest that high temperature char N content is the main factor limiting NO_x emissions with deep air-staged combustion. Char N and (hence apparently deep air-staged NO_x) can be predicted with an accuracy of approximately +- 20 percent for most coals from the coal proximate and ultimate analysis-but this might not be sufficient for stations operating close to their emission limits. Measuring high temperature char N directly reduces the likely uncertainty in deep air-staged NO_x emissions for coals (and most blends) to approximately +- 10 percent. Its use should be considered on a routine basis for coal selection on plants employing this technology.
机译：为了评估高温（1600摄氏度）炭氮含量与Hemweg电站（在德国）的NO_x形成之间的关系，已使用帝国理工学院的高温丝网设备（HTWM）对一系列世界贸易的煤炭样品进行了测试。荷兰）使用深炉空气分级。已经确认高温炭氮与NO_x形成之间的线性关系。这些结果表明，高温焦炭含量是限制深空燃烧时NO_x排放的主要因素。对于最接近和最终分析结果的煤来说，对于大多数煤而言，Char N和（显然是深空空气NO_x）的预测精度约为+-20％，但这对于在接近其排放极限的运行站而言可能还不够。测量高温炭氮可直接将煤炭（及大多数掺混物）在深空空气中NO_x排放的不确定性降低至大约±10％。在采用该技术的工厂中，在选择煤炭时应常规考虑使用它。

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