Temporary solution for excessively high burner temperature

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Our plant expanded the existing 2*42-chamber JN80-1 type coke ovens by adding 33-chamber JN80-IV type coke ovens. After switching to blast furnace gas for heating in 2003, the temperature at the oven tips became too high, with a temperature coefficient of only 0.67 for the horizontal 7 rows. Among them, eyes 1–7 and eyes 22–28 are both outside the standard range for horizontal alignment ； 2 eyes, and 27 eyes deviated by more than 70 degrees; the furnace temperature was 1220/1250 degrees. This results in a significant drop in coke yield, which not only increases the workload associated with operating the furnace door but also raises the heat consumption required for coke production. Although measures such as adjusting the reference temperature and increasing the branch pipe pressure were taken, the effects were not significant. The main reason for the above problem is that the JN80-IV type coke oven employs various insulation measures on its regenerator partition walls, which reduces leakage and heat loss from these partitions and thus increases the heating supply to the furnace throat ； In addition, circulation holes were added between the 2nd and 3rd burners to make the influence of the burner temperature more pronounced. Since the size of the slope adjustment bricks remained unchanged, the temperature in each horizontal row was higher at the ends and lower in the middle, resulting in a saddle-shaped pattern. To address this, we adopt a reverse-thinking approach by slightly opening the cover of the temperature measurement hole in the heat storage chamber. Allowing cold air to enter the gas regenerator in this way allows the gas to be diluted, as some of the exhaust gases from combustion are carried into the burner channel ； The second is the gas temperature and the grid brick temperature in the cooling nozzle section. After multiple adjustments by the flame tuning team, the best results were achieved when the temperature measurement hole cover in the gas regenerator was opened by about 8 mm. While ensuring proper coking maturity, the temperature at the furnace tip of Furnace No. 1 decreased by 50 to 70 degrees. The horizontal maturation of the coke becomes more uniform; measurements taken throughout the furnace show that the horizontal arrangement coefficient rises to 0.90, the saddle-shaped phenomenon disappears, and the temperature remains stable, thereby preventing a large amount of coke from falling at the furnace entrance. The above methods are only temporary measures; in the long term, inclined guide bricks need to be used to adjust the distribution of gas flow. It is recommended to improve the design of the inclined regulator bricks for the orifice plates in JN80-IV coke oven gas, in order to ensure stability in the cross-row temperature profile and reduce the heat consumption in coke production.