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对大型压力容器现场焊后局部热处理工艺设计,目前国内外工程技术人员大多根据经验来确定实施方案。作者运用工程传热原理,通过对近十处局部热处理实测数据的计算,建立了适合工程实际的设计计算模型和相关系数,并在日本引进大型塔设备的焊后局部热处理中得到应用与验证。从简体的结构分析认为:简体的轴向传热和保温棉的径向传热都属平板传热,因而可用平板传热公式计算。根据规范中规定的降温速度,计算并选取保温材料,确定其厚度及覆盖面积,再根据保温条件计算升温、恒温所需热量从而选择合适的加热器。
Large-scale pressure vessel on-site post-welding heat treatment process design, the current domestic and foreign engineering and technical personnel are mostly based on experience to determine the implementation plan. Based on the principle of engineering heat transfer, the authors calculated and calculated the actual measured data of ten local heat treatments, and established the design and calculation models and the correlation coefficients that are suitable for engineering practice. They were applied and verified in the post-weld local heat treatment of large-scale tower equipment imported from Japan. From the simplified structural analysis that: Simplified axial heat transfer and thermal insulation of cotton radial heat transfer are plate, which can be calculated using the plate heat transfer formula. According to the regulations in the cooling rate, calculate and select the insulation material to determine the thickness and coverage area, and then calculated according to insulation conditions heating, constant heat required to select the appropriate heater.