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直流锅炉等蒸发受热面一般都是由许多根管子并联组成的,由于各管的长度、弯头、内径等结构尺寸不同,进出口集箱中沿集箱长度静压变化的影响,以及各管受热情况不同,使各管出口处工质的焓不同,这就是热偏差现象。本文首先讨论了以平均管的压降代替管组压降的可靠性,因为一般在手工计算中是用平均管的压降与偏差管的压降相平衡的原则来计算热偏差的,分析指出在压力较高,
Evaporative heating surfaces such as direct-flow boilers are generally composed of many root pipes in parallel. Due to the different sizes of the pipes such as length, elbow and inner diameter, the influence of static pressure changes along the length of the header in the import and export headers, Tube heating situation is different, so that the export of pipe enthalpy different, this is the phenomenon of thermal deviation. This paper first discusses the average tube pressure drop instead of tube pressure drop reliability, because the manual calculation is usually used in the average tube pressure drop and the bias tube pressure drop to balance the principle of calculating the thermal deviation, the analysis pointed out In the high pressure,