在一些系统中，油液表面的泡沫不会造成很大的损害，但泡沫的存在说明相当量的空气滞留在油液当中。
In some systems, foam at the surface may not cause a lot of damage, but the presence of a foam layer normally indicates extensive air entrainment.
控制公式同时包含了当量碳燃烬比对空气供给的影响。
Control formula includes influence of carbon equivalent burn-out ratio to air supply.
研究分析了天然气再燃效果的影响因素：包括天然气投入的比例、空气的化学当量比、再燃区的温度、烟气在再燃区的停留时间等。
The factors that impact the reburning effectiveness are analyzed, such as the natural gas percentage of boiler heat input, air stoichiometry, reburn zone temperature and residence time etc.
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