Safety Control Of Fuel Gas Burner
Safety Control Of Fuel Gas Burner
In the development and design of gas burners, it is difficult to solve the problems of combustibility, explosiveness, and toxicity, which has become the primary problem of combustion safety control. Today, the small section on EUPRO burners analyzes the safety control of gas burners:
According to the characteristics of gas combustion in the furnace, safety control requirements include pre-blowing, automatic ignition, combustion status monitoring, non-ignition protection, flameout protection, high and low-pressure protection, and INS protection. Low voltage, power failure protection, and measures to prevent gas leakage accidents.
1. Pre blowing
Before ignition, the burner must have a period of pre-blowing time to remove or dilute the residual gas in the furnace and flue. As there is inevitable residual gas in the burner working furnace, if the ignition is carried out without pre-blowing, there is an explosion risk. The residual gas must be purged or diluted to ensure that the gas concentration is within the explosion limit. According to the furnace structure and blowing speed, the pre-blowing time is generally set as 15-60 seconds.
2. Automatic ignition
Spark ignition can be used for the fuel gas burner, because this ignition method is more conducive to the automatic control of flame gas. In addition, we can also use the arc ignition generated by the high-voltage ignition transformer. However, the conditions of this telephone method are relatively harsh, requiring its output energy: voltage ≥ 3.4kV, current ≥ 16mA, and ignition time generally 2.5~5s.
3. Combustion state monitoring
Combustion status must be monitored dynamically. If the flame detector detects the flameout alarm signal, it must be fed back to the burner in a short time. Then, the burner conducts the fastest treatment, and then enters the protection mode to cut off the gas supply.
In daily life, it is also necessary to detect the flame detector to check whether it works normally and make it insensitive, which is a better adaptation. If the sensitivity is too high, the combustion state fluctuation is easy to cause misoperation and delays judgment, and the feedback flame signal lags too slowly, which is not conducive to safe operation. Therefore, the response time from extinguishment to fire signal of the fire detector shall not exceed 0.2 seconds generally.