How to determine the air excess coefficient in coke ovens
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Who can tell me the method and process for determining the residual coefficient of coke oven air, as well as the chemicals used? Thank you! ! ! Since I’m not from a coal chemical engineering background and couldn’t find any information online, that’s why I’m seeking help. Thank you! ! !
It is recommended to use a flue gas oxygen content analyzer or a furnace negative pressure monitor. The air excess coefficient, also known as the surplus air coefficient, is generally kept around 1.35; too low a value can affect the combustion process, while too high a value leads to heat loss and reduces the furnace’s thermal efficiency. It is necessary to find a balanced value for this coefficient.
Refinery furnaces generally use zirconia to monitor the excess air coefficient. For normal heating furnaces, the appropriate excess air coefficient is 1.05–1.15 when using gas as fuel, and 1.15–1.25 when using oil. To reduce the excess air coefficient, it is first necessary to use burners with good performance to ensure complete combustion at a lower excess air coefficient; secondly, it is important to properly control the various controls such as the air valves, gas valves, fuel valves, and flue dampers during operation, so as to maintain operation at a reasonable excess air coefficient