What should be done if the exhaust furnace shuts down frequently?
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Our flue gas furnace often shuts down, and the reason for this is that the flue gas system is not in operation. When the load on the sulfur production unit exceeds 40%, the flue gas generated by sulfur production flows directly into the incinerator, which increases the amount of gas and causes the furnace to shut down. When more gas is used, the flame ends up being too far away from the burner, resulting in a loss of combustion and thus furnace shutdown. What should we do in such a situation? (It’s already impossible to fix the exhaust issue.) Is there any expert who can give some guidance? Thank you all in advance! This post was last edited by adsl121 on 2009-3-26 15:54]
How are the H2S and SO2 analyzers performing? Is there an excess of SO2? What method do you use for reheating? If it’s an online furnace, is the amount of exhaust gas too high? Please send over the specific data so I can take a look.
Regarding the fire extinguishing issue in the exhaust furnace, I suggest: 1. There is almost certainly a problem with the gas flow velocity in your burner. The deactivated units that require further maintenance have been partially modified. It is sufficient to simply increase the diameter of the nozzle; it is easy to calculate so that the speed of the gas exceeds that of the air. 2. The issue of mixing air with gas needs to be resolved, as a shorter flame is preferable. After the modification, I can guarantee that your exhaust furnace will not go out
1. It is recommended to replace the burner. 2. It is recommended to add an additional DG15 branch line to the gas control valve to serve as a pilot light. 3. The gas valve in front of the furnace has a limit to control the pressure of gas entering the furnace. 4. Changes in gas composition. It contains more light components. 5. Agree with Lou Shan’s view!
^_^After reading everyone’s explanations, I learned a lot more. I would like to ask if your exhaust furnace has a measurement point for burner pressure drop; this parameter is quite useful.
Based on the information provided from the first floor, even if the exhaust unit is turned on, the changes in the process gas will not be significant, and it will not alter the current conditions in the burning furnace. There are two main reasons for flameout: one is the burner itself, and the other is the negative pressure in the burning furnace. It is recommended to reduce the opening degree of the flue damper slightly, and to use a U-shaped differential pressure gauge to keep the differential pressure at around 20 KPA.
What the poster mentioned – that \"after increasing the gas supply, the flame ends up too far away from the burner, resulting in a loss of combustion and thus the furnace going out\" – indicates that the gas nozzle in the exhaust furnace is blocked, causing the orifice to become smaller; as a result, the gas is ejected at high velocity but the flame remains small. It is recommended to carry out inspections and cleanings during downtime. Additionally, check whether the flue dampers behind the exhaust furnace are set too wide open; maintaining a slight positive pressure in the furnace chamber helps prevent the furnace from going out This post was last edited by zxh6267 on 2009-3-28 11:19.]
What the original poster mentioned – that \"after increasing the gas pressure, the flame ends up too far away from the burner, resulting in a loss of combustion and thus the furnace going out\" – is mainly due to high pressure of the fuel gas. Also, what is the primary color of the flame in the combustion chamber? According to what you said, it should be orange-yellow; if that’s the case, then there isn’t enough air. The exhaust furnace should use peroxide combustion. Is the exhaust furnace a positive-pressure furnace or a negative-pressure furnace? If it is a negative-pressure furnace, the pressure might be too high, which can also easily cause the furnace to stop functioning.
The burner structure of the exhaust gas incinerator should be checked carefully. When our old equipment was in operation, burning gas alone resulted in excellent combustion conditions; however, the flame would go out as soon as exhaust gas was introduced. It was later found that the problem lay in the design of the burner – the gas was located in the middle, with exhaust gas on the inside and air on the outside. When exhaust gas was introduced into the burner, it separated the gas from the air, and even a small amount of exhaust gas could cause a flash explosion in the burner; more exhaust gas would lead to the flame going out. The solution was to replace the exhaust gas inlet with an air inlet, thereby resolving the issue.