对影响硫酸装置设计的各种参数进行分析，给出了尾气循环工艺与传统流程在工艺条件及能源回收等方面的对比数据。
The analysis of plant design parameters is made to present a comparison between standard and stack gas recycle plants with reference to process condition and energy recovery.
最后将银法和铁钼法的生产工艺和方法进行了比较，突出了尾气循环银法生产甲醛工艺的优点。
Finally, a comparison between the two technologies catalytic by silver and iron-molybdenum was made, merits of exhaust gas cycling technique for production of formaldehyde were shown significantly.
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