Gas combustion equipment
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Why does the gas burner we use often go out after being lit? How to solve it? Thank you!
Was it because the air supply was set at a high level, which blew out the fire? Also, the ratio of air to gas wasn’t correct! ! Do your combustion nozzles have primary and secondary air? Check what the ratio between these two is; if this ratio is not correct, it can easily lead to the flame going out! ! !
Is the calorific value of gas too low? It’s best to install a flame detector and an automatic igniter; if the furnace is large, use stable fuel to power several small permanent burners. Otherwise, it’s a bit dangerous. Last edited by RainWolf on 2009-2-28 12:46]
The question is a bit vague; there are many reasons why a burner might stop working, and both of the people above mentioned could be correct. 1. The air flow rate is either too high or too low； 2. Fluctuations in gas pressure ； 3. The calorific value of the fuel gas is too low; generally, it needs to be greater than 2500 Kcal/Nm3 to ensure stable combustion ； 4. The fuel gas pressure is too low ； 5. The air wind speed at the nozzle outlet is too high ； 6. Unreasonable design of the air distribution structure. In the latter two cases, generally, adding a trumpet-shaped flame stabilizer or a blunt body to create a certain recirculation zone near the nozzle should help improve the stability of the flame.
Has the burner structure been tested? If the structure is fine, it might be out-of-fire, with too high an air outlet velocity. Based on the parameters of the burner, measure the air pressure in front of the burner under rated conditions, and determine the difference from the rated pressure. Fluctuations in the calorific value of gas can also cause the flame to go out.
Gas burners generally come equipped with low-pressure protection; it is necessary to pay close attention to the time when the flame goes out – whether it happens right after ignition or when the flame reaches a high intensity. If the flame goes out right after ignition, it may be due to a problem with the flame detector, as the program controller does not receive a signal from the flame and therefore shuts off the solenoid valve. If it switches to high flame and then goes out, it might be due to low-pressure protection or too much air intake through the air vents, causing the flame to be blown out. You need to provide the gas calorific value, supply pressure, time of the fault occurrence, control method, and controller model in order to properly diagnose the fault
The issue is related to the air flow volume or the structure of the burner
It may be due to the low calorific value of the gas; many process waste gas boilers experience flameout for this reason. The solution is to use household gas or inject fuels such as methanol to increase the calorific value. If it is due to excessive air volume, simply redesign the fan
We use negative pressure for ignition, usually at 20-30 mm of water column. Is it better to have a higher or lower negative pressure?
There are various reasons: 1. Large fluctuations in gas pressure; 2. Large fluctuations in furnace pressure; 3. Excessive or insufficient air supply. It is recommended to install an ignition pilot light and a flame detector.
It is very likely that the ratio of wind to coal powder, as well as the ratio of primary to secondary air, has not been adjusted properly; there are generally no major issues with the structure of the coal powder burners