How to observe the combustion in the coke oven combustion chamber with the naked eye

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The quality of gas combustion is quite important for adjusting the flame. To determine the quality of gas combustion, in addition to using exhaust gas analysis to calculate the excess coefficient, it is common to observe the flame with the naked eye in order to assess whether the mixture of gas and air is appropriate, whether there is any \"short circuiting\", if the burner is damaged, if the nozzles have fallen off, and if there are any leaks in the gas ducts. Based on experience, when burning coking gas under normal coking conditions, the flame appears rice-yellow during the day; in the ducts where the burner is far from the circulation holes, the flame takes on the shape of a slender torch, with a slight white tint ； During night observation, it appears white and bright; the burner is located near the circulation hole in the flame channel, where the flame mixes with the exhaust gases and fills the channel. When there is more air and less gas, the flame goes out; it also appears bright and dazzling when observed during the day ； When there is little air and plenty of gas, the flame becomes dim and smoky ； When there is little air and gas, the flame is smaller compared to a flame in a flue with the same polarity ； If there is an abundance of both air and gas, the flame is larger compared to a flue with the same polarity. To determine the flame, in addition to observing the flame in the upward airflow, one should also look at the color at the bottom of the downward airflow to assess the temperature level. When heated with blast furnace gas, since the burning flame is blue and transparent, it is difficult to accurately assess the combustion condition by observing the flame. Therefore, analyzing the exhaust air coefficient is used as the main method to check the combustion condition. Observing a flame mainly involves looking at its position. Since in most cases the amount of gas is greater than that of air, the normal flame is not at the exact center but leans toward the air inlet. When using mixed gas, the position of the flame varies depending on the mixing ratio; the higher the mixing ratio, the more it shifts toward the gas inlet. If the flame leans too much toward the air inlet, it indicates that there is less air and more gas ； The opposite is true if it leans towards the gas chute opening. At low temperatures, the blue flame is more visible, while it becomes less noticeable as the temperature rises. This can be determined by the shade of color at the two chutes; the chute with the darker color indicates a greater amount of gas ； It can also be determined by the degree of turbidity in the flue; under normal conditions it is clear and free of turbidity, and the greater the turbidity, the more gas is present. When too much gas is supplied, blue flames emerge from the viewing hole. Relationship between the color of furnace bricks and temperature range: Around 600°C – dark red; visible at night. Around 700°C – dark crimson; visible at night. Around 800°C – deep cherry red. Around 900°C – cherry red. Around 1000°C – light cherry red. Around 1100°C – dark orange. Around 1200°C – bright orange. Around 1300°C – orange-white. Around 1400°C – dazzling white