excess n. 1.过量;过剩。 2.超过,超越。 3.超过数量。 4.过度,(饮食等)无节制。 5.〔pl.〕 过分行为,暴行。 an excess of enthusiasm 过分热心。 an excess of exports [imports] 出[入]超。 an excess of supply over demand 供过于求。 an excess of ABC3 100 over the estimate 比预算超额100美元。 excess of authority 越权。 go [run] to excess走极端。 in excess过度。 in excess of 超过。 (smoke) to excess(吸烟)过度。 with excess of joy 因过度高兴。 adj. 过量的,超过限额的,过量的。 an excess fare 补票费。
In this paper a perfect and flexible experimental system of low nox combustion is established firstly . the influences of the temperature of combustion , the air excess coefficient , a certain amount of vapor added in advance , the temperature of preheated air , adding microwave into gas before combustion , gas recycling combustion and the mode of combustion ( diffused and premixed ) on nox emission are analyzed respectively . the combustion of liquid petroleum gas is simulated with phoenics 3 . 5 首先建立了完善灵活的低no _ x燃烧实验系统,在实验系统上完成了燃烧温度、过量空气系数、预先加入一定量的水蒸汽、空气预热温度、对燃气预先进行微波处理、烟气再循环燃烧以及燃烧方式(扩散式与预混式)对no _ x生成的影响分析;采用phoenics3 . 5软件进行了液化石油气燃烧的数值模拟。
It is firstly found that the nox concentration increases rapidly when is less than 0 . 75 , which complements the staged combustion and the rich - lean combustion that are well considered currently as low nox combustion . it does not mean that the combustion must be the low nox combustion when < 1 . there is a limited least value of air excess coefficient 对目前普遍认为的分级燃烧和浓淡燃烧可以降低no _ x排放的提法给予补充,即对一次过量空气系数有一个最小值限定,不是小于1的任何值都可以,低于最小限定值将是不利的,而且一次过量空气系数有一个最佳值。