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立式锅炉外壳与炉胆的连接元件—下脚圈,目前有3种结构:U型、S型、H型。至今H型下脚圈由于尚未进入标准,国内应用较少。本文仅论述U型与S型下脚圈。U型、S型下脚圈的强度计算,我国GB/T 16508—1996与JB 3622—84《锅壳式锅炉受压元件强度计算》标准皆采用以下传统计算方法:1)无冲天管立式锅炉下脚圈的最小需要厚度2)有冲天管立式锅炉下脚圈的厚度无需计算,取炉胆厚度。其它一些国家计算亦基本如此。按以上计算规定,无冲天管立式锅炉的计算结果表明,U型下脚圈厚度明显大于炉胆,更大于锅壳,给制造带来很大麻烦。约30年前,按二维曲梁模型推导出的计算公式~([1])与前述的式(1)基本一致,计算所需厚度对比见表1。
Vertical boiler shell and furnace connection components - foot ring, there are three kinds of structures: U-type, S-type, H-type. H-type so far has not yet entered the standard as the lower legs, less domestic applications. This article only discusses the U-type and S-type footer. U-shaped, S-type hedging strength calculation, China GB / T 16508-1996 and JB 3622-84 “shell-and-tube boiler pressure element strength calculation” standards are used the following traditional calculation methods: 1) The minimum required thickness of the next foot circle 2) The thickness of the foot tube of the open tube vertical boiler without calculation, take the furnace thickness. In other countries, the calculation is basically the same. Calculated according to the above calculation, the calculation results of the non-flush day-tube vertical boiler show that the thickness of the U-shaped lower annulus is obviously greater than that of the furnace and more than the shell of the boiler, which brings great troubles to the manufacturing. About 30 years ago, the calculation formula ~ ([1]) derived from the two-dimensional curved beam model is basically consistent with the above formula (1), and the required thickness comparison is shown in Table 1.