Control of nitrogen oxides in flue gas from heating furnaces
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The nitrogen oxide levels in this heating furnace are consistently above the allowed limits. The type of furnace is the same as that of other heating furnaces; the only difference is the fuel used – while others use something similar to natural gas, this furnace uses catalytic dry gas, which is why the levels are excessive. Is it a problem with the fuel gas, or is it related to the burner? I hope experts can provide answers
It is related to fuel, load, **, and operating mode – it cannot be determined in just one sentence
If there is an oxygen analyzer in the flue gas, the oxygen excess coefficient can be calculated. The type of fuel affects combustion; as mentioned above, it cannot be explained in just a few words.
This issue can only be resolved by installing flue gas denitration! !
There are various possibilities; generally, it’s 1: fuel issue； 2. Burner issues ； 3. Temperature, etc.
For denitration facilities in the convection section, SCR can address the issue of excessive nitrogen oxide levels
Burner modification: replacement with low-nitrogen burner
I agree with what was said above: replace the burner with a low-nitrogen one. If the furnace temperature exceeds 1000 degrees Celsius, it is necessary to implement an external flue gas circulation system to control the oxygen content in the heating furnace.
Solution: 1. Replace with a low-nitrogen burner； 2. Control the oxygen content in the heating furnace properly ； 3. Sample the fuel gas for analysis to determine the nitrogen content concentration