Blue smoke coming from the fire monitoring hole cover (the impact of desulfurization and denitrification systems on the furnace combustion system)
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This post was last edited by angryant on 2019-7-20 at 15:45. Some say it’s caused by incomplete combustion of gas, but tests on the excess coefficient were conducted repeatedly earlier, and the value was around 1.0; although low, there was no CO present. The main issue is that the oxygen level is relatively low. To increase the temperature in the chamber, efforts have been made, but the temperature there isn’t very high – it’s basically between 770 and 790 degrees. Experts, please advise me on what causes the blue smoke coming from the viewing ports, and why the low chamber temperature results in a low flame at the inlet, which in turn leads to high temperatures at the bottom and prevents the chamber temperature from rising. It’s really frustrating
Test the components of the gas to see if its calorific value is low as well, and check whether there are any leaks in the air wall
The calorific value has remained around 4000 with no significant changes; the wind wall was already checked earlier and no major issues were found
If the calorific value of gas is low, what is the relationship with smoke coming from the flame viewing holes? I hope you can explain this
If the calorific value of the gas is low, it cannot burn at a sufficient temperature; in such cases, the burner operator has to increase the amount of gas supplied. However, changes in the air volume usually occur later than increases in the gas supply, so some of the gas does not burn completely, resulting in blue smoke
Here, the coking time is 26 hours; the standard temperature is 1330, the damper setting is 190, the suction force in the secondary flue is 200, the total suction force in the flues is 330, the suction force at the top of the chamber ranges from 36 to 64, the operator setting is 1/3, the temperature inside the chamber is 790, while the temperature at the top of the chamber is 1160. The value of ‘a’ is around 1.03. The oxygen level is around one or two, and the carbon dioxide level is around 7. I’ve tried increasing the damper setting before, but this resulted in a significant drop in the temperature inside the chamber. Could you please explain your situation in more detail so I can give some advice? ! !
Dude, just by looking at the data you gave me, it’s clear you’re an expert in this field. In my opinion, the coke industry is a relatively rudimentary form of chemical manufacturing; if any one of the nine temperatures and five pressures involved in adjusting the coke ovens isn’t set properly, it can cause problems with the ovens. The quality of the gas produced during the chemical recovery process also varies as a result. What’s the altitude in your area? I’ve encountered a situation in Xinjiang where the temperature can’t be increased, as the oxygen content in the air is 2% lower; meanwhile, the oxygen ion concentration is higher in coastal areas, which prevents the temperature in the space above the furnace from rising. Moreover, when blue smoke comes out of the burner openings, does the suction created by that smoke prevent any smoke from escaping? This issue is systematic, not related to just one aspect. What’s discussed here can only be suggestions from others; you need to check each one separately. But I’m telling you: go and organize those nine temperatures and five pressures, give the fire adjusters some rewards; maybe they can find a solution if they try
We don’t use chimneys; they’re currently in standby mode, and devices for desulfurization and denitrification are installed there, yet smoke is still produced. As for the issue of ammonia ions you mentioned, I’ve considered it before as well. However, in one of our plants that uses the same type of furnace, I don’t face such problems. But it’s not practical to ask our employees to solve this issue; it’s not a matter of disapproval towards the employees – it’s caused by factors in the social environment
If blue smoke is coming from some of the fire viewing ports, consider whether there is a leak in the furnace roof area. Considering smoke coming from the entire furnace, think about the composition of the gas.
Have the temperatures of the individual flue ducts and the main flue duct increased? Desulfurization and denitration devices may cause the gas to shift backward, resulting in incomplete combustion at the viewing ports!