3 Boiler of a power plant under the designed coal quality and the relatively higher store chamber contamination coefficient caused the failure of the fume temperature at the inlet of air preheater, principal steam temperature and temperature of reheated steam to reach the designed values.
针对某电厂3号炉运行煤种偏离设计煤质、设计炉膛沾污系数相对偏大造成空气预热器入口烟温、主汽温、再热汽温不能达到设计值等问题,进行了锅炉试验测定和问题原因分析,制定了最终的改造方案。
The experimental investigation for contamination factor of spiral-finned tube bank is carried out.
进行了螺旋肋片管束的工业性试验研究,得出了不同横、纵向相对节距的螺旋肋片管束的沾污系数与烟速的拟合关联式,可应用于锅炉的受热面设计及运行分析。
The experimental investigation for contamination factor of helically finned tube bank is carried out.
得出了不同横、纵向相对节距的螺旋翅片管束的沾污系数与烟速的拟合关联式,可应用于锅炉的受热面设计及运行分析。
When gas passing through helically finned tube banks, ash would deposit on its surface and affect heat transfer characteristic, so Contamination factor e and thermal effective coefficientΨ are used to represent the effects.
但由于沾污层分布不均匀，主要分布在管束的迎风面和背风面，且形状不规则而厚度无法测量，所以一般采用沾污层平均热阻即沾污系数ε以及热有效系数ψ来考虑这一影响，这是锅炉受热面设计中的一个重要的数值，其值的准确性会直接影响到锅炉的经济性和运行的安全性，而沾污系数ε的取值则具有很大的不确定性，由于ε值的数值本身已与对流放热热阻处于同一数量级，因此，螺旋翅片管束沾污系数ε的取值至关重要。
The effect of gas speed and contamination coefficient are considered thoroughly.
深入考虑了矩形肋传热效果的2个重要影响因素——烟风速度和污染系数,论证了矩形肋的优化对省煤器增加传热量降低造价具有很重要的作用。
Not setting error distribution as normal distribution,two estimations of contamination coefficient and regression coeffcient are obtained whether the variance of error is known or not.
讨论了(I)型污染回归模型,并不假定误差分布为正态,分别从误差方差为已知和未知两个方面给出污染系数及回归系数的参数估计,并在适当的条件下证明其强相合性。
In the thermal calculation of the boilers,people should understand some kinds of coefficients exactly such as contamination coefficient ε,heat effective coefficient ψ and usage coefficient ζ.
在锅炉的热力计算中,应对污染系数ε、热有效系数ψ和利用系数ζ等系数有准确理解。