针对圆形烟道流速监测点布置存在的问题，用流体力学理论进行分析、优化，在确定采样断面后，在距采样孔0。
In view of problems existing in velocity of flow monitoring points collocation in circular flue, using hydrodynamics theory to analyze and optimize, one monitoring point at 0.
二段浸出后的滤液用二氧化硫烟道气还原，还原液经冷冻结晶、水溶、过滤、精制后可得纯度较高的精白砷。
High purity arsenic trioxid was obtained from the 2nd stage filtrate by reduction with SO2 flue gas, freeze crystallization, water dissolving, filtering and refining.
分析了结焦的原因，提出了用干法除尘设备将烟道气除尘后才用来干燥蔗渣的解决办法；
This paper analyzes its causes and suggests the use of a dry-type ash collector to remove the ash in the flue gas before the drying process.
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