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发明公开
CN107923283A 用于处理废气流的方法和废气处理系统 有权

用于处理废气流的方法和废气处理系统
摘要：
根据本发明，提供一种用于处理废气流的方法和废气处理系统，该废气流由内燃机中的燃烧产生并且包括氮氧化物NOx。该方法包括废气流中的包含氮、碳和氢中的一种或多种的化合物的第一次氧化。该方法还包括确定在第一次氧化之后离开第一氧化催化剂的第一量的二氧化氮NO2_1和第一量的氮氧化物NOx-1之间的比率的值(NO2-1/NOx-1)。该方法还包括将第一添加剂第一次供应到废气流中，该第一次供应基于比率的确定值(NO2-1/NOx-1)det来主动控制。随后，通过在催化过滤器中的催化反应来进行至少第一量的氮氧化物NOx_1的第一次还原。该催化过滤器由具有还原特性的至少部分催化涂层的颗粒过滤器组成。催化过滤器布置成捕获和氧化碳烟颗粒并且进行第一量的氮氧化物NOx_1的第一次还原。
摘要（英）：

According to the present invention a method and an exhaust treatment system, are provided for treatment of an exhaust stream, which results from a combustion in a combustion engine and comprises nitrogen oxides N0X. The method comprises a first oxidation of compounds comprising one or more of nitrogen, carbon and hydrogen in the exhaust stream. The method also comprises a determination of a value(NO2-1/NOx-1) det for a ratio between a first amount of nitrogen dioxide NO2_1 and a first amount of nitrogen oxides NOx-1 leaving a first oxidation catalyst after the first oxidation. The method alsocomprises a first supply of a first additive into the exhaust stream, which is actively controlled based on the determined value (NO2-1/NOx-1) det for the ratio. Subsequently, a first reduction of atleast the first amount of nitrogen oxides NOx_1 is carried out through a catalytic reaction in a catalytic filter. This catalytic filter consists of a particulate filter with an at least partly catalytic coating with reduction characteristics. The catalytic filter is arranged to catch and oxidise soot particles, and to carry out the first reduction of the first amount of nitrogen oxides NOx_1.

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