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许多研究者定量地说明了燃料中氮转化为NO_x的量,很大程度上取决于燃烧区域的氧气浓度。在煤粉燃烧中,氧有两种来源,一种由运行过量空气提供,另一种就在煤的自身之中。本文的研究结果,定量地说明了燃料中氮的转化与运行过量空气的关系,另外,还说明了煤中氮向NO_x的转化取决于煤中含氧量。从十二台机组的现场试验数据来看,煤中氮向NO_x的转化百分比,随煤中氧氮比的增加而增加,运行过量空气量为20%时,转化百分比的变化范围是6%到15%。本文的要点是煤的含氧量在形成燃料型NO_x的过程中起重要的作用。从文中所列事实可以想象,能达到的NO_x排放量的下限值受到煤中自身的含氧量的限制。
Many researchers have quantified how much nitrogen is converted to NO x in the fuel, depending largely on the oxygen concentration in the combustion zone. In pulverized coal combustion, there are two sources of oxygen, one is supplied by running excess air and the other is in the coal itself. The results of this paper give a quantitative description of the relationship between the conversion of nitrogen and the excess air in the fuel. In addition, it shows that the conversion of nitrogen to NO x in coal depends on the oxygen content in coal. From the field test data of 12 units, the conversion percentage of nitrogen to NO_x in coal increases with the increase of the ratio of oxygen to nitrogen in coal. When the excess air is operated at 20%, the conversion percentage is 6% 15%. The main point of this paper is that the oxygen content of coal plays an important role in the formation of fuel-type NOx. It is conceivable from the facts listed in the text that the lower limit of the achievable NO x emission is limited by the oxygen content of the coal itself.