When the gas boiler is in normal operation, the fuel flame is durable and stable. However, if there are some unexpected situations, it is easy to cause the phenomenon of "tempering" and "defire", which will seriously affect the safety of gas boilers.
Compared with air, the gas fuel concentration of gas boilers is at the combustion limit. If the flow rate of flammable gas in the burner is lower than the burning rate, the flame will propagate toward the fuel source and a so-called "tempering phenomenon" will occur. The study found that the higher the furnace temperature of gas boilers, the faster the flame propagation speed, the easier it is to produce tempering. Due to the occurrence of tempering in the burner, the damage to the burner is great, and the burner will explode when it is serious. Compared with tempering phenomenon, the condition of detempering phenomenon is that the flow rate of combustible gas at the outlet of the burner is higher than the speed of combustion, leading to the combustion of fuel in the direction of the original burner. This phenomenon is called "deignition". It is found that when the gas boiler is under a low load condition, the boiler is easier to deignite.
Through testing, if it is caused by too low gas pressure, it is necessary to carry out a thorough inspection of the gas pipeline of the gas boiler. If it is caused by too high gas pressure, it is necessary to carry out normal operation of the regulating valve on the whole gas pipeline, strictly check the total air pressure on the gas pipeline and the pressure before the burner, as well as the valve opening of the burner. If it is caused by the decrease of the total pressure of the gas supply pipeline in the gas boiler room, it is necessary to contact the gas supply station in time to quickly improve the gas supply pressure. If the intake pressure is normal, it is necessary to test whether the pressure regulator is normal.
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