Reasons for the rapid increase in the exhaust gas parameter NO
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This post was last edited by 【Coking】Chang Jiangning on 2016-12-10 21:47. The online detection of NO remains relatively stable when no coal is being fed into the furnace, but it rises sharply once high-pressure ammonia water is used for coal feeding. What is the relationship between these two phenomena? Thank you.
There are leaks, but how can high pressure reach the combustion chamber, thereby increasing the exhaust gas levels?
The low voltage remains unchanged; it increases when the high voltage is turned on. How to explain it?
It’s quite strange, by the way – are they top-mounted coke ovens or tamped coke ovens?
I suddenly remembered. This has nothing to do with whether high-pressure water is used or not; it seems that after coke is pushed out, the heat generated in the flame channel has nowhere to go, so the temperature in that channel continues to rise. The longer the furnace remains empty (in the case of top-loaded coke ovens), the higher the temperature in the flame channel becomes. There is an exponential relationship between NOx production and temperature! Go and check the increase in furnace temperature after coke pushing!
5.5, Working on the coke oven: introducing a small amount of high-pressure air into the carbonization chamber – but how does this affect the waste gases? Puzzling.
The online detection of NOx in the exhaust gas remains relatively stable when there is no burning or coal loading, but the NOx level in the exhaust gas rises rapidly when coal is loaded and high-pressure ammonia water is used. What is the relationship between these two phenomena? 1. Phenomenon analysis: Under normal production conditions, when there are no coke pushing or coal charging operations, the NOx concentration in the exhaust gases remains stable, indicating that production is running smoothly. Even if there are any leaks, they occur in a steady manner and are not caused by sudden leaks within the furnace. The coal loading operation in conjunction with the use of high-pressure ammonia water is a normal part of the production process; there is nothing abnormal. The negative pressure generated by the high-pressure water jet is what facilitates the introduction of raw gas into the gas collection system. 2. Possible reasons: Reason 1: The negative pressure generated by high-pressure water is not sufficient to allow the waste gas produced during coal loading to be discharged smoothly; as a result, a high positive pressure builds up locally, causing it to leak into the vertical flue at the leakage points in the furnace body. Reason 2: After coke pushing, the carbonization chamber is empty, resulting in an excess of heat in the vertical flue. If the chamber remains empty for a long time, the temperature in the vertical flue continues to rise, leading to the generation of large amounts of heat-induced NOx. 3. On-site verification: A preliminary assessment can be made on-site by measuring the pressure inside the carbonization chamber during coal loading. The furnace temperature was measured and compared before coal loading after coke pushing. 4. The single-chamber carbonization chamber control Proven Proven system performs automatic adjustments based on a mathematical model of the pressure changes in the carbonization chamber throughout the retorting cycle. The gas collection pipe remains at around -350 Pa at all times.
After coal is loaded and high-pressure ammonia water is introduced, a negative pressure is generated in one carbonization chamber. There may be leaks, and the temperature of the furnace when pushing coke out for the second time is too high