How to adjust the furnace chamber deviation in a heating furnace?

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The atmospheric and vacuum heating furnaces in our workshop are all cylindrical furnaces. Since it is at the end of the system gas flow path, there is not enough gas in the system for combustion, resulting in large fluctuations. We use a combination of oil and gas. Of course, oil and fire have a high calorific value. Therefore, when adjusting the furnace deviation, oil and fire adjustment is usually the primary method. 10 burners in the atmospheric pressure furnace. 8 burners in the vacuum furnace. The temperature difference between various locations should not exceed 30 degrees. I have been burning stoves for almost 2 years. It’s a shame that my skill level isn’t good enough to keep up with the old furnaces in the workshop. I still mainly focus on looking at the temperature trend lines – I adjust the level of the side that is high by lowering it, and I raise the level of the side that is low. The old furnaces often talk about the \"pressure difference inside the furnace\" and the \"flow direction of the flue gas\". In fact, there is no smoke in the stove. The so-called flue gas refers to the hot gases produced after combustion. The two situations that give me the most trouble are: 1 For example, the temperature is high in the north and low in the south. But the flames in the north were all gas flames, and they were quite short. The flames in the south are already very high. By common sense, one should continue to intensify the flames on the south side. Deviation adjustment is difficult to be effective. Instead, we need to stoke the fire on the high north side again. Also, books often say, “More flames, uniform flame heights.” ”When the flames are even, a deviation in the furnace chamber is not necessarily good. When it’s uneven, the deviations from various directions are quite good. How can this be reasonably explained theoretically? 2 For example, it is higher in the north and lower in the south. After 5 minutes, it becomes low in the north and high in the south. 5 minutes later, it turned back to high in the north and low in the south. Periodic variation. With the naked eye at the scene, it was not possible to see the flame fluctuating in length. In all the above cases, the elderly explained it using the \"direction of the smoke flow\". In Case 1, the hot smoke on the side with the higher flame rises and changes direction, blowing directly toward the thermocouple on the opposite side; this results in the odd phenomenon of lower temperatures on the side with the higher flame. Adjusting the furnace deviation is really abstract. I’m not sure if everyone will be able to understand what I’m saying. I hope to learn from other stokers the methods for adjusting furnace deviations. My understanding of the “direction of smoke flow” is still limited, as it’s something that cannot be seen or touched. What’s written in books doesn’t apply either. If anyone has any insights, please feel free to share them.