1. Before the pre-blowing burner is ignited, there must be a period of pre-blowing to blow off or dilute the residual gas in the furnace and flue. Because there is inevitably residual gas in the working furnace of the burner, if it is ignited without pre-blowing, there is a danger of explosion. The residual gas must be blown off or diluted to ensure that the gas concentration is not within the explosion limit. The pre-blowing time is related to the structure of the furnace and the blowing volume, and is generally set to 15-60 seconds.
2. Automatic ignition The gas burner should adopt electric spark ignition to facilitate automatic control. A high-voltage ignition transformer can be used to generate arc ignition, and its output energy is required to be: voltage ≥ 3.5K V, current ≥ 15mA, and the ignition time is generally 2 to 5 seconds.
3. Protection against ignition When the burner is ignited, the gas is fed in, and the gas ignites and burns. The ignition action is required to occur before the gas is introduced, and the ignition temperature field is formed first, which is convenient for ignition and combustion. If the ignition fails, the flame detector cannot detect the flame signal, and the burner enters the protection state. The time from ignition to entering the protection state should be appropriate, neither too short nor too long. If it is too short, there will be no time to form a stable flame; if it is too long, a large amount of gas will enter the furnace when the ignition fails. It is generally required that the burner judges the flame signal sensed by the flame detector within 2-3 seconds after the gas is turned on. If it is not on fire, it will enter the protection state, and if it is on fire, it will maintain combustion.
4. Combustion state monitoring The combustion state must be dynamically monitored. Once the flame detector senses the flameout signal, it must be fed back to the burner in a short time. The burner will then enter the protection state and cut off the gas supply at the same time. The flame detector should be able to sense the flame signal normally, neither sensitive nor dull. Because of the sensitivity, if the combustion state fluctuates, it will easily cause malfunction and be slow, and the feedback flame signal will lag behind, which is not conducive to safe operation. It is generally required that the response time from the flameout to the flame detector sending out the flameout signal is no more than 0.2 seconds.
5. Flame-off protection During the combustion process of the burner, if the flame is accidentally turned off, the burner will enter the protection state. Since the furnace is hot, it is easy to cause deflagration when the gas enters, so it must enter the protection state in a short time and cut off the gas supply. From the occurrence of flameout to the burner entering the protection state, the response time of the process is required to be less than 1 second.
6. The high and low limits of gas pressure protect the stable combustion of gas burners within a range, and only the gas pressure is allowed to fluctuate within the range. The purpose of limiting the high and low pressure of the gas is to ensure the stability of the flame: no flameout, no flameout and no tempering, and at the same time limit the output heat power of the burner to ensure the safe and economical operation of the equipment. When the gas pressure is out of this range, the burner should be locked to work. The design of the burner generally uses a gas pressure switch to sense the pressure signal and output a switch signal to control the corresponding work of the burner.
According to Binmeijia, the general agent of Riyadh Road, there are three ways to solve the leakage problem in the furnace: one is to strengthen the pre-blowing time and blowing volume to blow off or dilute the gas in the furnace; the other is to use two solenoid valves in series in the gas pipeline, Improve system safety; the third is to use a pipeline leakage detection device to detect the gas pipeline before ignition, and if the gas leakage reaches the limit, the burner will be locked to work.
1. Before the pre-blowing burner is ignited, there must be a period of pre-blowing to blow off or dilute the residual gas in the furnace and flue. Because there is inevitably residual gas in the working furnace of the burner, if it is ignited without pre-blowing, there is a danger of explosion. The residual gas must be blown off or diluted to ensure that the gas concentration is not within the explosion limit. The pre-blowing time is related to the structure of the furnace and the blowing volume, and is generally set to 15-60 seconds.
2. Automatic ignition The gas burner should adopt electric spark ignition to facilitate automatic control. A high-voltage ignition transformer can be used to generate arc ignition, and its output energy is required to be: voltage ≥ 3.5K V, current ≥ 15mA, and the ignition time is generally 2 to 5 seconds.
3. Protection against ignition When the burner is ignited, the gas is fed in, and the gas ignites and burns. The ignition action is required to occur before the gas is introduced, and the ignition temperature field is formed first, which is convenient for ignition and combustion. If the ignition fails, the flame detector cannot detect the flame signal, and the burner enters the protection state. The time from ignition to entering the protection state should be appropriate, neither too short nor too long. If it is too short, there will be no time to form a stable flame; if it is too long, a large amount of gas will enter the furnace when the ignition fails. It is generally required that the burner judges the flame signal sensed by the flame detector within 2-3 seconds after the gas is turned on. If it is not on fire, it will enter the protection state, and if it is on fire, it will maintain combustion.
4. Combustion state monitoring The combustion state must be dynamically monitored. Once the flame detector senses the flameout signal, it must be fed back to the burner in a short time. The burner will then enter the protection state and cut off the gas supply at the same time. The flame detector should be able to sense the flame signal normally, neither sensitive nor dull. Because of the sensitivity, if the combustion state fluctuates, it will easily cause malfunction and be slow, and the feedback flame signal will lag behind, which is not conducive to safe operation. It is generally required that the response time from the flameout to the flame detector sending out the flameout signal is no more than 0.2 seconds.
5. Flame-off protection During the combustion process of the burner, if the flame is accidentally turned off, the burner will enter the protection state. Since the furnace is hot, it is easy to cause deflagration when the gas enters, so it must enter the protection state in a short time and cut off the gas supply. From the occurrence of flameout to the burner entering the protection state, the response time of the process is required to be less than 1 second.
6. The high and low limits of gas pressure protect the stable combustion of gas burners within a range, and only the gas pressure is allowed to fluctuate within the range. The purpose of limiting the high and low pressure of the gas is to ensure the stability of the flame: no flameout, no flameout and no tempering, and at the same time limit the output heat power of the burner to ensure the safe and economical operation of the equipment. When the gas pressure is out of this range, the burner should be locked to work. The design of the burner generally uses a gas pressure switch to sense the pressure signal and output a switch signal to control the corresponding work of the burner.
According to Binmeijia, the general agent of Riyadh Road, there are three ways to solve the leakage problem in the furnace: one is to strengthen the pre-blowing time and blowing volume to blow off or dilute the gas in the furnace; the other is to use two solenoid valves in series in the gas pipeline, Improve system safety; the third is to use a pipeline leakage detection device to detect the gas pipeline before ignition, and if the gas leakage reaches the limit, the burner will be locked to work.