The NOx emission is high along with the great of primary air rate.
一次风率越大，氮氧化物排放量越大。
Exhaust emission of vehicle engines is one of the primary air pollution sources.
车用内燃机的废气排放是大气污染的主要污染源之一。
This increases the initial primary air fan size and reduces the forced draft fan sizes.
这会增加一次风机的尺寸而减小从动风扇的尺寸。
Meanwhile, the control of air flow, furnace negative pressure and primary air flow are introduced.
同时也介绍了送风量、炉膛负压和一次风量的控制。
The test results show that it is feasible to shorten the length of guide plate in a primary air pipe duct.
结果表明，缩短一次风管道内导流板的长度是可行的。
The problem that the primary air leakage of trisector AH is large arises some domestic customers attention.
三分仓空气预热器一次风泄漏量偏大，引起国内部分用户的反响。
When the primary air blast wave from the explosion strikes the ground another blast wave is produced by reflection.
当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。
The mixing point of primary air and secondary air of burner is a key parameter for the flame stabilization of fuel.
燃烧器一、二次风混合位置是燃烧着火稳燃的关键。
When the primary air blast wave from the explosion strikes the ground, another blast wave is produced by reflection.
当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。
The curve of relationship between flame speeds and the primary air ratio is got, and when primary air ratio is about 0.
得出了二甲醚火焰传播速度与一次空气系数的关系曲线，并且在一次空气系数约为0。
The concentration distribution of pulverized coal in primary air pipe is very important for advancing efficiency of boiler.
掌握煤粉锅炉一次风管中煤粉浓度的分布情况，对提高锅炉效率有很重要的意义。
Common processes of primary air fan-coil system are given in this paper. The disadvantage of winter process is pointed out.
本文给出风机盘管加新风系统冬夏季常用处理过程，指出冬季处理过程确定困难的缺点。
In this paper the selection and optimum of operation of the pressure type cold primary air fan in large boiler were analyzed.
分析了大型锅炉正压冷一次风机选型及运行优化要点，指出煤种和空预器漏风率是影响一次风机选型的主要因素。
In experiment, steady operating point of combustion can be obtained mainly by setting primary air factor and the size of spout.
在实验中，主要通过调整一次空气系数和引射器喷口的大小，达到稳定燃烧的运行工况。
As a high velocity air jet, it supports and straightens the primary air stream and thus prevents slagging on the furnace walls.
作为一股高速射流，它对一次风气流起支撑作用，以防止炉壁结渣现象的发生。
The effects of the plate spacing, approach velocity and the primary air temperature on evaporative cooler was predicted theoretically.
通过计算表明，换热器通道间距、空气的迎面风速，以及一次风的干球温度的变化对换热器效率有很大的影响；
The distributions of gas temperature, O2, CO2, CO, and NO concentrations were measured under different swirl numbers for the primary air.
测量了在不同的一次风旋流数下，气体的时均温度、O2、CO2、CO和NO浓度的分布。
After putting the primary air system into automatic operation, the pressure difference between two underpants legs can be basically controlled to 2.
一次风系统投入自动运行后，两侧双支腿床压之差基本能控制在2。
It is shown that both the ignition and the combustion efficiency can be significantly improved and the ratio of primary air can be greatly increased.
试验结果表明，钝体可显著改善劣质煤着火情况和大幅度提高燃烧效率，并可允许大幅度提高一次风率。
By using this method, winter process of primary air fan-coil system is more convenient to be determined and the performance of fan coil is more stable.
该方法能方便确定风机盘管加新风系统冬季处理过程，并且冬夏季风机盘管运行更稳定合理。
The creditable measurement of pulverized coal concentration in primary air is the basis of combustion optimization and safe operation of utility boilers.
一次风煤粉浓度的可靠测量是电站锅炉燃烧优化和安全经济运行的前提条件。
In comparison with the conventional tangentially fired system, the horizontal bias burner and the twin circles of the primary air are two main improvements.
与传统的切圆燃烧系统相比，水平浓淡燃烧器和同层一次风双向切圆布置是该系统的主要改进之处。
Through installing recirculation tube on the mill and shrinking the primary air pipe diameter, the percentage of cool Sir To combustor is reduced by 8. 12%.
在增加磨煤机再循环风管的同时缩小一次风管径，使进入炉膛的冷风量减少了8.12%(总风量)。
Meanwhile analysis was made on how primary air, concentration of pulverized coal, mill outlet temperature and pulverized coal fineness affected ion ignition.
为此分析了点火过程中一次风速、煤粉浓度、磨煤机出口温度和煤粉细度等对等离子点火的影响。
Using recirculation flow to heat the primary air and increasing the concentration of pulverized coal in primary air really do good to boiler flame stability.
利用回流烟气加热一次风煤粉气流和提高一次风气流的煤粉浓度，都有利于锅炉燃烧的稳定。 开缝钝体燃烧器的设计综合考虑了回流加热和煤粉浓度局部富集。
Secondly, it researches and summarizes the theory of primary air velocity measurement and establishes the theoretical basis as well as the design of the frame.
其次，对一次风速测量原理进行了研究和总结，确立了风速计算的理论基础，进行了总体结构框架的设计；
The paper research completely deep present consuming energy to Primary air fan-coil unit system, Path and method of energy saving was systematically brought forward.
本文对风机盘管空调系统的耗能现状进行了全面地分析研究，提出了一些节能的途径和方法。
Stable coal transportation and kiln thermal condition is achieved by increasing primary air rate, improving inventory and modifying screw clearance of the screw pump.
通过采取提高一次风风量、控制合理库存、改造螺旋间隙等措施，达到了稳定煤粉输送量的目的，稳定了窑内热工制度。
In this paper, a new supporting equipment of primary air pipein cooler is introduced , and the design principle, main features and application situation are discussed.
介绍一种新型的冷却机主风管的支撑装置，针对设计原则、主要特点和使用情况进行了讨论。
It is showed that being the interaction between primary air and upstream fluid, the shear eddy the the wake are formed on the two sides of the primary air respectively.
结果表明，一次风射流由于与上游横向射流的相互作用，在背火侧形成尾迹涡，在向火侧形成剪切涡。
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