The big chimney is emitting blue smoke
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Coke oven gas, calorific value of 4000; air inlet at 200, the valve set at 3/5. Instantaneous gas flow: 14500; flue gas extraction amount: 220, total extraction amount: 500. The flame appears to be burning okay, but it still seems like the combustion is not optimal. Reducing the gas flow to 10000 reduces smoking, but some smoke still appears; no matter how adjustments are made, blue smoke is produced. When the air inlet is increased to 230, there is no more smoke, but the flame temperature drops significantly and the system is on the verge of failing. I seek advice from experts
Correct the position of the opener at 2/5; now I want to prevent smoking, and how can I lower the flue temperature from 340?
Blue smoke is generally caused by sulfur oxides; first, check the total sulfur content in the composition of the gas, and then examine for any leaks in the structure of the coke oven!
We have checked for any leaks; the sulfur content is a bit high, but there was no blue smoke in the past
Check if there is water accumulation in the flue! The main reason is that the gas contains too much sulfur; when water is present, it condenses into small mist droplets, which then show color under sunlight!
The chimneys here sometimes emit white smoke and sometimes black smoke; it’s because the furnaces are too old, making it difficult to control everything. With such strict environmental regulations, it’s not easy to carry out coking operations. .
Coke oven gas contains a high amount of sulfur. Or some raw gas leaking from the furnace wall has entered the coke oven exhaust system.
The coking and metallurgy industry is a major area affected by environmental issues.
Exhaust gases contain a certain amount of nitrogen oxides (including nitric oxide and nitrogen peroxide). When these combine with other gases in the exhaust gases, such as carbon monoxide and sulfur dioxide, and are exposed to sunlight and ultraviolet rays, they undergo a series of chemical reactions that result in the formation of a light blue haze – what is known as \"photochemical smog\". As the levels of nitrogen and other nitrogen-containing compounds in the gas increase, the amount of nitrogen oxides produced during combustion also rises; under the influence of sunlight and ultraviolet rays, blue smoke emanating from the chimney can be clearly seen.
I have also seen information regarding this part, but there is nothing definite; it’s hard to say exactly how much it is