Boiler burners, gas burners my country's natural gas and natural gas (raw coal) resources are rich, belonging to clean energy, with good social and economic benefits. Gas internal combustion engines are in line with my country's industrial policies, have a good market prospect, and have broad development prospects. However, in the development and design of gas combustion machinery, the main problems of gas characteristics, such as flammability, explosion toxicity, safety control, etc., are the most important issues in the development and design of gas burners. The following is an introduction to the safety control requirements of gas burners:
In the combustion characteristics of the furnace, it is mainly used with pre-blowing safety control requirements, automatic ignition, combustion state monitoring, protection of misfire, flame protection, high and low limit protection gas pressure gas, air pressure is insufficient protection, power supply protection measures to prevent gas leakage accidents.
1. Pre-blowing
Before ignition, the combustion chamber must have a period of pre-blowing to remove or dilute the residual gas in the furnace and flue. Gas burners have residual gas in the working furnace of the combustion chamber. If pre-blowing ignition is not performed, there is a risk of explosion. The residual gas must be blown away or diluted to ensure that the gas concentration is not within the explosion limit.
The pre-blowing time is usually set to 15 or 60 seconds related to the furnace structure and the blowing air volume.
2. Automatic ignition boiler burner
The gas burner ignition spark should be used to promote automatic control. The arc can be struck by a high-voltage ignition transformer, and the required energy output is: voltage ≥ 35K V, current ≥ 15mA, and the ignition time is usually: 2~5 seconds.
3. 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 internal combustion engine in a very short time. The internal combustion engine immediately enters the protection state and cuts off the gas supply at the same time.
The flame detector should be able to sense the flame signal normally, neither sensitive nor slow. Due to sensitivity, if the gas burner has fluctuations in the combustion state, it is easy to produce false actions and slowness, and the feedback flame signal is delayed, which is not conducive to safe operation.
The general requirement for the response time of the signal sent from the flame to the flameout flame detector is no more than 0.2 seconds.
4. Protection against ignition failure
When the internal combustion engine is ignited, the gas is introduced and ignited. The ignition action of the boiler burner requires the formation of an ignition temperature field before the introduction of gas to facilitate ignition and combustion. If the ignition does not start, the flame detector cannot detect the flame signal, and the internal combustion engine enters the protection state.
The time from ignition to protection should be appropriate, neither too short nor too long. If it is too short to form a stable flame, it will cause a large amount of gas to enter the furnace when the ignition fails. It is generally required that the flame signal detected by the gas burner flame detector should be judged by the burner when the gas is added for 2~3 seconds. If the flame detector does not ignite, it will enter the protection state and maintain the combustion state.
5. Flameout protection
The burner is in the combustion process, if the flame is accidentally extinguished to protect the combustion state. Because the furnace is hot. Gas entry is prone to detonation, it should be a very short time to enter the protection state and cut off the supply of gas.
The response time from flameout to the internal combustion engine personal protection process shall not exceed 1 second.
6. Gas pressure limit protection
Boiler burner gas burner has a range of stable combustion, and the gas pressure fluctuation is only within a certain range. The object defines high and low pressure gas to ensure the stability of the flame: no flameout, no flame backfire, and at the same time limits the thermal power output of the burner to ensure the safe operation of the equipment. When the gas pressure exceeds this range, the work should lock the burner.
In general, the gas pressure switch is used to sense the pressure signal and output the switch signal to control the corresponding work of the internal combustion engine.
7. Insufficient air pressure protection
The gas burner is designed with high thermal intensity, and its combustion mode is affected by the explosion. If the air is interrupted or insufficient, the gas will be cut off immediately, otherwise the furnace will explode or the fan will be backfired. Therefore, while improving the quality of the fan, the gas control must be linked to the air pressure, and when the air pressure is insufficient, the gas supply should be cut off immediately.
Usually the gas pressure switch senses the air pressure signal and outputs a switch signal to the respective action control of the gas solenoid valve.
8. Power-off protection
When the internal combustion engine suddenly loses power during operation, the gas burner must immediately cut off the gas supply to protect the safety of the equipment. The gas control solenoid valve must be closed normally. Once the power is cut off, the gas supply will be automatically cut off. The solenoid valve closing response time is ≤5s.
9. Measures to prevent gas leakage accidents..
Including two gas leaks, it refers to a gas leaking into the environment, through the solenoid valve core end line finger furnace gas leakage.
Environmental leakage may cause workplace personnel poisoning and explosion accidents, and must be taken seriously. First, seal the pipeline, and the boiler burner regularly checks whether the pipeline is leaking. If the pipeline leak is eliminated, the pipeline can continue to be used. Secondly, to avoid gas concentrations that cause poisoning and explosion, the gas burner workplace must be well ventilated: set up permanent vents and forced ventilation devices. In addition, fireworks and electrical components must not be explosion-proof at the work site.
Boiler burners, gas burners my country's natural gas and natural gas (raw coal) resources are rich, belonging to clean energy, with good social and economic benefits. Gas internal combustion engines are in line with my country's industrial policies, have a good market prospect, and have broad development prospects. However, in the development and design of gas combustion machinery, the main problems of gas characteristics, such as flammability, explosion toxicity, safety control, etc., are the most important issues in the development and design of gas burners. The following is an introduction to the safety control requirements of gas burners:
In the combustion characteristics of the furnace, it is mainly used with pre-blowing safety control requirements, automatic ignition, combustion state monitoring, protection of misfire, flame protection, high and low limit protection gas pressure gas, air pressure is insufficient protection, power supply protection measures to prevent gas leakage accidents.
1. Pre-blowing
Before ignition, the combustion chamber must have a period of pre-blowing to remove or dilute the residual gas in the furnace and flue. Gas burners have residual gas in the working furnace of the combustion chamber. If pre-blowing ignition is not performed, there is a risk of explosion. The residual gas must be blown away or diluted to ensure that the gas concentration is not within the explosion limit.
The pre-blowing time is usually set to 15 or 60 seconds related to the furnace structure and the blowing air volume.
2. Automatic ignition boiler burner
The gas burner ignition spark should be used to promote automatic control. The arc can be struck by a high-voltage ignition transformer, and the required energy output is: voltage ≥ 35K V, current ≥ 15mA, and the ignition time is usually: 2~5 seconds.
3. 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 internal combustion engine in a very short time. The internal combustion engine immediately enters the protection state and cuts off the gas supply at the same time.
The flame detector should be able to sense the flame signal normally, neither sensitive nor slow. Due to sensitivity, if the gas burner has fluctuations in the combustion state, it is easy to produce false actions and slowness, and the feedback flame signal is delayed, which is not conducive to safe operation.
The general requirement for the response time of the signal sent from the flame to the flameout flame detector is no more than 0.2 seconds.
4. Protection against ignition failure
When the internal combustion engine is ignited, the gas is introduced and ignited. The ignition action of the boiler burner requires the formation of an ignition temperature field before the introduction of gas to facilitate ignition and combustion. If the ignition does not start, the flame detector cannot detect the flame signal, and the internal combustion engine enters the protection state.
The time from ignition to protection should be appropriate, neither too short nor too long. If it is too short to form a stable flame, it will cause a large amount of gas to enter the furnace when the ignition fails. It is generally required that the flame signal detected by the gas burner flame detector should be judged by the burner when the gas is added for 2~3 seconds. If the flame detector does not ignite, it will enter the protection state and maintain the combustion state.
5. Flameout protection
The burner is in the combustion process, if the flame is accidentally extinguished to protect the combustion state. Because the furnace is hot. Gas entry is prone to detonation, it should be a very short time to enter the protection state and cut off the supply of gas.
The response time from flameout to the internal combustion engine personal protection process shall not exceed 1 second.
6. Gas pressure limit protection
Boiler burner gas burner has a range of stable combustion, and the gas pressure fluctuation is only within a certain range. The object defines high and low pressure gas to ensure the stability of the flame: no flameout, no flame backfire, and at the same time limits the thermal power output of the burner to ensure the safe operation of the equipment. When the gas pressure exceeds this range, the work should lock the burner.
In general, the gas pressure switch is used to sense the pressure signal and output the switch signal to control the corresponding work of the internal combustion engine.
7. Insufficient air pressure protection
The gas burner is designed with high thermal intensity, and its combustion mode is affected by the explosion. If the air is interrupted or insufficient, the gas will be cut off immediately, otherwise the furnace will explode or the fan will be backfired. Therefore, while improving the quality of the fan, the gas control must be linked to the air pressure, and when the air pressure is insufficient, the gas supply should be cut off immediately.
Usually the gas pressure switch senses the air pressure signal and outputs a switch signal to the respective action control of the gas solenoid valve.
8. Power-off protection
When the internal combustion engine suddenly loses power during operation, the gas burner must immediately cut off the gas supply to protect the safety of the equipment. The gas control solenoid valve must be closed normally. Once the power is cut off, the gas supply will be automatically cut off. The solenoid valve closing response time is ≤5s.
9. Measures to prevent gas leakage accidents..
Including two gas leaks, it refers to a gas leaking into the environment, through the solenoid valve core end line finger furnace gas leakage.
Environmental leakage may cause workplace personnel poisoning and explosion accidents, and must be taken seriously. First, seal the pipeline, and the boiler burner regularly checks whether the pipeline is leaking. If the pipeline leak is eliminated, the pipeline can continue to be used. Secondly, to avoid gas concentrations that cause poisoning and explosion, the gas burner workplace must be well ventilated: set up permanent vents and forced ventilation devices. In addition, fireworks and electrical components must not be explosion-proof at the work site.