Why is it difficult to control the air excess factor?
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Testing location: at the suction point of the smoke duct. The results of each analysis are different, and it is not possible to achieve stability; the measurement results were satisfactory today, but unsatisfactory the next day – the values keep fluctuating. The gas flow rate remains relatively stable, and no adjustments have been made to other processes. There have been no significant changes in external temperatures, wind direction, etc
For modern coke ovens, it is recommended to keep the temperature used for heating coke oven gas between 1.35 and 1.5; this is because: 1) In modern large-scale coke ovens, the coking time varies significantly depending on market conditions, resulting in unstable production processes； 2. Frequent equipment failures affect the coke pushing efficiency coefficient ； 3. The moisture content of coal fed into the furnace varies significantly between shifts. Therefore, a larger air coefficient control facilitates adjusting the gas flow rate at any time.
Oh, indeed. The control range we require is 0.1; each time it goes outside this range, it’s by just a little bit more than 0.1. For example, our normal control range is 1.25–1.35, but the coefficient often falls within the range of 1.20–1.25 or 1.35–1.4