论文部分内容阅读
屏式过热器广泛用于高参数大容量电站锅炉中。以前设计中采用苏联57年的热力计算标准,其中根本没有考虑同一片屏各管之间的巨大吸热偏差,而实测证实屏外圈管的焓增比平均值大得多,同屏热偏差(一般是外圈管的焓增与平均焓增之比)有的高达1.5～2.0,因此许多电站中发生屏外圈管爆管的事故。但以前对造成同屏热偏差的原因还缺少分析。本文在理论分析和试验实践的基础上,提出了造成同屏热偏差的四个基本原因是:(1)外圈管所受到的炉膛辐射热量比内圈管大;(2)外圈管的辐射受热面比内圈管大;(3)外圈管比较长,因此其受热面
Screen superheaters are widely used in high-parameter high-capacity power plant boilers. In the past, the design of the Soviet Union 57 years of thermal calculation standards, which did not consider the same piece of screen between the tube endothermic deviation, and measured actually confirmed that the enthalpy of the outer circle tube is much larger than the average, the same screen thermal deviation (Generally the ratio of enthalpy increase and average enthalpy increase of the outer ring tube) is as high as 1.5-2.0, so many tube explosion accidents occur outside the screen. However, before the cause of the same screen as the thermal deviation is still lack of analysis. Based on the theoretical analysis and experimental practice, this paper presents four basic reasons for the thermal deviation on the same screen: (1) the heat radiated by the outer ring tube is larger than that of the inner ring tube; (2) the radiation of the outer ring tube Heating surface than the inner ring tube; (3) Outer tube longer, so the heating surface