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中文摘要：
对立式异径螺旋火管锅炉的操作数据和结构数据进行物料估算，建立了数学模型，并通过编程计算和热力分析得到了该锅炉的操作性能参数，分析了其工作状况。结果表明：在操作条件下，锅炉的气侧垢阻和气侧对流传热热阻具有相同的数量级，是控制热阻，此时在一定的温度范围内适当提高进气温度，可使气体的流速增加，从而减小控制热阻，使出口温度降低，改善传热性能。但如果气侧垢阻小于1．0×10^-4m^2·K／W时，工艺气体进口温度的提高对出口影响可以忽略。同时得出了工艺气的质量流量、进口温度和产汽量三者之间的关系，并提出了调整和改进意见。
英文摘要：
The study was conducted to define the operating and performance properties of an existing vertical reducing helix fire tube boiler to improve its cost effectiveness. After reviewing the structure information, performance data and operating problems, a mathematic model was developed for thernodynamic analysis of the boiler. The model simulations show that heat transfer resistances of the gas side fouling and the gas phase convection are both important factors. Increasing the inlet gas temperature reduces the heat transfer resistances by enhancing the flow velocity which can lower the outlet gas temperature and thus improve the heat transfer. However, increasing the inlet gas temperature results in a very small improvement in lowering the outlet gas temperature when the gas side fouling resistance is smaller than 1.0× 10 ^-4 m^2 · K/W. The model, which also correlate the mass flux, the inlet gas temperature and the gas production, is useful for guiding design and making adjustments to achieve better and trouble free operation for similar boilers.
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