Abstract The influence of nitrogenous fuel impurities in a 120 kWth chemical looping combustion pilot unit was investigated. Two oxygen carriers were used. An in industrial scale produced perovskite type CaMn0·775Mg0·1Ti0·125O3-δ, called C28 and a copper based oxygen carrier (Cu15) prepared by impregnation were applied. Natural gas was used as fuel and ammonia (NH3) were added as a model NOX precursor up to a fuel-N content of 1.4 wt%, to investigate the path of nitrogen and emissions of nitrogen oxides. The exhaust gas streams of air and fuel reactor were analyzed against NH3 and NOX. The two oxygen carriers performed differently in the presence of NH3 in the fuel feed. While the general fuel conversion performance of both oxygen carriers were not affected, the NH3 conversion with C28 was only around 72% in the fuel reactor, full NH3 conversion was measured with Cu15. During the experiments with C28, NOX emissions in form of NO occurred in the fuel reactor, opposite to this no NOX have been detected while using Cu15. During all experiments no NOX was observed in the air reactor exhaust gas stream. A regeneration during CLC operation after switching off the ammonia feed was possible.

中文翻译：

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使用两种不同的氧载体研究气体燃料化学循环燃烧中氮的归宿

摘要 研究了含氮燃料杂质对120 kWth化学回路燃烧先导装置的影响。使用了两个氧载体。应用了工业规模生产的钙钛矿型CaMn0·775Mg0·1Ti0·125O3-δ，称为C28和通过浸渍制备的铜基氧载体(Cu15)。使用天然气作为燃料，并添加氨 (NH3) 作为模型 NOX 前体，燃料氮含量高达 1.4 wt%，以研究氮的路径和氮氧化物的排放。针对 NH3 和 NOX 分析空气和燃料反应器的废气流。在燃料进料中存在 NH 3 时，两种氧载体表现不同。虽然两种氧载体的一般燃料转化性能不受影响，但在燃料反应器中，C28 的 NH3 转化率仅为 72% 左右，用 Cu15 测量 NH3 的完全转化。在使用 C28 的实验中，燃料反应器中发生了以 NO 形式出现的 NOX 排放，与此相反，使用 Cu15 时没有检测到 NOX。在所有实验中，在空气反应器废气流中没有观察到 NOX。在关闭氨进料后，CLC 操作期间的再生是可能的。