It’s so annoying – the negative pressure in the heating furnace keeps fluctuating on its own; I don’t know why
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It’s so annoying – the negative pressure in the heating furnace and the furnace temperature keep fluctuating on their own. I don’t know what’s causing it There are several sources of fuel: low-pressure gas from hydrogenation, dry gas after purification, as well as natural gas supplied from outside. What’s the situation exactly?
It may be caused by unstable fuel supply or uneven air flow distribution inside the furnace. It is recommended to check the supply of fuel to each circuit and ensure even airflow distribution within the furnace. It is also possible to check whether there are any faults or adjustments needed in the furnace chamber and the negative pressure control system. .
Thank you for the reminder; there’s no blockage
The negative pressure is generated because the amount of gas drawn out by the exhaust fan exceeds the amount of gas entering the system. The amount of gas entering is influenced by factors such as the pressure and composition of the fuel being introduced, as well as the amount of air supplied. An unstable fuel pressure leads to unstable amounts of fuel gas entering the system; unstable fuel composition can affect whether the combustion process occurs at a constant volume or a variable volume. Unstable levels of air supplied, such as changes in air humidity, can also result in unstable amounts of gas produced during combustion. Additionally, the adjustment parameters of the exhaust fan may not be fast enough to keep up with the changes in the volume of gas being discharged from the furnace
If the exhaust fan serves multiple flue gas streams, negative pressure fluctuations may occur. If an inlet baffle is used to control the flow rate for the exhaust fan, choosing a baffle that is too large or too small can also cause problems. If the fuel gas is not completely burned, backflow causing afterburning can also result in negative pressure fluctuations. Multiple measurements of the actual oxygen content are required, as well as the CO content, in order to assess the combustion condition of the furnace.
Another point is that, in actual production, fluctuations in the temperature at the inlet and outlet of the heating furnace can also cause negative pressure and fluctuations in the furnace temperature. The reasons for these fluctuations at the inlet are the effects of variations in the heat exchange temperature, while at the outlet they are caused by the PID control of the gas valves in the heating furnace
It is necessary to verify on-site the combustion performance of the furnace to determine whether there is secondary combustion; when this occurs, it is usually secondary combustion, and in severe cases it can lead to a flash explosion in the furnace chamber. Of course, the prerequisites include whether the burner nozzle is clogged, and whether there are any changes in the frequency and power of the exhaust fan.
Passing by, learning* a bit. The analysis is very thorough
You’re right; coming up with the idea of secondary combustion inside the heating furnace is great – I give you a thumbs up