How to properly control the flue gas from the reboiler
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How to keep nitrogen oxides and disulfides from exceeding the limits
To control it from the fuel side, either replace the furnace burner with a low-nitrogen burner
What can’t be done by controlling the air supply volume?
If your burners are low-nitrogen burners, it is possible to adjust the air-fuel ratio in order to keep the levels of harmful substances in the flue gases within acceptable limits； If not, while maintaining the furnace load, you can try adjusting the air supply volume to regulate the furnace’s combustion. We have replaced all the burners in our company’s furnaces, but the nitrogen oxide levels in the exhaust gases remain too high; it’s not possible to adjust them, and the environmental standards are not being met. Controlling the amount of hydrogen sulfide in the fuel gas of the furnace allows the sulfur dioxide content in the flue gases to be kept within acceptable levels.
If the oxygen level in our furnace is high, nitrogen oxides tend to increase easily
There are many forms of nitrogen oxides, including nitrogen dioxide. Under high-temperature combustion conditions, nitrogen oxides are primarily nitric oxide. Nitric oxide is highly reactive and readily reacts with oxygen to form nitrogen dioxide; therefore, by increasing the amount of air, more oxygen is available to react with nitric oxide and produce nitrogen dioxide.
Oh, is it related to incomplete combustion of the fuel gas, or too much excess air?
You can look up information on the properties of nitrogen oxides on Baidu; in terms of implementation, it mainly involves equipment and manufacturing processes.
If there is an excess of air, complete combustion should be possible; other reactions will also occur right after combustion.