Think about a question (how to control the temperature of the furnace)

Your question involves complex issues in combustion science and thermodynamics; I will try to answer it simply. Firstly, there is no simple linear relationship between the flow rate of acidic gases and the temperature of the combustion furnace. Under specific flow conditions, various factors such as the shape of the flame, cooling conditions, and combustion efficiency all affect the temperature of the combustion furnace. Secondly, an increase in the flow rate of acidic gases will, theoretically, lead to an increase in the temperature of the combustion furnace, assuming that other conditions such as combustion efficiency, flame shape, and cooling conditions remain unchanged. However, if the flow rate of acidic gases is increased along with the volume of the combustion furnace, this may offset the effect of the increased flow rate on the temperature of the combustion furnace. As for whether the combustion furnace will be damaged, it depends on its design and the materials used in its construction. If the combustion furnace is made of materials capable of withstanding high temperatures, and the possible maximum temperature is taken into account in its design, then it should be able to operate safely. Regarding the issue that \"under the same amount of acidic gas, a larger furnace has a lower temperature while a smaller furnace has a higher temperature,\" it’s not that simple either. The size of the furnace alone does not determine the furnace temperature; other factors such as combustion efficiency, the furnace’s insulation material, and cooling conditions also affect it. Overall, your understanding makes some sense, but the actual situation is more complex, as the temperature of the furnace is influenced by many factors. In practice, controlling the temperature of a combustion furnace usually requires good combustion management and strict monitoring. .

There are many aspects to controlling the combustion temperature; the layout of the furnace, the air supply ratio, and the type of burner all affect the maximum temperature in the combustion zone

You’re putting the cart before the horse a bit here; the furnace is the priority, and other things can be discussed later.

Any combustion involves the issue of the oxygen-to-fuel ratio; simply increasing the fuel does not necessarily raise the combustion temperature.

Having worked with boilers and gas generators, my understanding is that the combustion temperature range is determined by the process requirements, while during operation it is controlled by the amount of fuel supplied and the air supply. With a small furnace and high levels of acidic gases (probably sulfur dioxide resulting from sulfur transformation), without an adequate supply of air, sufficient combustion cannot occur; as a result, the temperature will not rise, and the flue gas exiting the furnace will contain large amounts of combustible gases. With a small furnace and high levels of acidic gases, as well as increased air supply, the temperature may rise (the maximum temperature depends on the temperature of the gas combustion flame). However, due to the small furnace volume, the short residence time of the mixed gases results in combustion lag.