The problem of yellow smoke
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The sulfur dioxide level is 4 mg/m3, the NOx level is around 20 mg, the dust content is 0.4, and the oxygen level is 10. The flue gas at the outlet of the chimney is yellow-colored – what could be the causes of these conditions?
Do the teachers know the reason as well?
Is it caused by incomplete combustion of the boiler, or by inadequate denitration performance?
It’s probably caused by dust and smoke; nitrogen oxides are not sufficient to produce such a color. It’s necessary to work on removing dust from the flue gas, and check whether there are any damages to the bag filters
It should contain nitrogen dioxide, showing brownish-yellow smoke
The original poster failed to provide clear details such as the composition of the materials and the operating conditions; otherwise, any analysis can only be based on guesses. High levels of NOx and sulfur both cause the flue gas to appear yellowish
Is the yellow smoke related to S?
Is this something that happens often? High levels of nitrogen oxides and sulfur contribute to the yellowish color of flue gases.
High levels of nitrogen oxides and sulfur cause the flue gas to turn yellow.
The problem has been identified; it’s caused by high levels of nitrogen oxides. Thank you everyone