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屏式过热器是高参数大容量锅炉中重要部件之一。1957版苏联的热力计算标准中有关屏式过热器壁温计算的方法没有将同屏各管之间很大的汽温偏差考虑进去,因此不符合实际情况。根据它的方法来设计屏式过热器有超温爆管的险险。本文中首先分析了造成同屏各管汽温偏差的四个原因,并在这个基础上导出了计算同屏各管汽温偏差的方法和公式。为了简化计算,在计算公式中引入了若干特性参数,并加以图表化。
Screen superheater is one of the important components in high-parameter high-capacity boiler. 1957 version of the Soviet Union’s thermal calculation standards for wall-type superheater wall temperature calculation method does not take into account the large screen between the tube temperature deviation into account, it does not meet the actual situation. According to its method to design a screen superheater burst pipe overheating risks. In this paper, the four causes of the deviation of steam temperature in the same screen are analyzed first, and on this basis, the method and formula for calculating the deviation of steam temperature in the same screen are derived. In order to simplify the calculation, several characteristic parameters have been introduced into the calculation formula and charted.