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author： 2020-05-29
Description of working process of burner (description of working process of burner)
Three elements of combustion: fuel, ignition source, combustion oxygen.
· excess air coefficient: the ratio of the actual air amount of combustion to the theoretical air amount of fuel.
· NOx: the general name of NO and NO2 nitrogen oxides produced in the combustion process.
· diffused combustion with natural ventilation: the air required for combustion is not supplied with oxygen by fans or other forced wind supply methods, but by the combustion mode of combustion with combustion oxygen, which is obtained by natural ventilation or the injection of air by the pressure of the fuel itself.
· forced blast combustion: a combustion mode in which air is forced by a fan or compressor to provide combustion oxygen, and most industrial burners are in this form.
· premixed combustion (ejection type) : the fuel and air are pre-mixed in proportion before the ejection combustion, and then the ejection combustion.
· FSG: FLAME SAFEGUARD SYSTEM combustion safety protection device.FSG generally consists of the following parts:
O power supply: for system operation and relay suction.
O flame detection: detect and judge the flame status at any time.
O ignition output: supply the power to the ignition transformer to generate the spark required for ignition, and automatically shut down after confirmation of normal ignition to protect the ignition transformer.
O valve control output: open the fuel solenoid valve for ignition combustion during ignition output or after a slight delay.
O alarm output: in case of ignition failure or flameout in normal combustion, the fuel valve can be cut off in time and the alarm signal can be output.
O others: FSG is equipped with many different accessories according to requirements, such as: burner fan pressure switch input, temperature control input, fuel pressure switch input, etc.
· ion flame detection: using the principle of one-way ionization of high-temperature flue gas, an ac voltage is added to the flame to confirm the flame state by detecting whether the current exists or not.
· photoelectric flame detection: the light from the flame itself is used to detect the flame state through the photoelectric sensor.
, purging: before ignition burner ignition device is equipped with automatic control, to ensure the safety of the first ignition, before the formal ignition, can will fresh air into the furnace combustion fan, dilution, cleaning of combustible gas in the hearth, purging time is related to size and burner combustion chamber of a stove or furnace, general requirements meet the furnace for air purging time 4 times.
(after the furnace stop blowing: when the normal combustion, the flame temperature at the burner nozzle can reach more than one thousand degrees, because by the circulation fan constantly take away the high temperature flue gas, so the burner and combustion chamber can keep below a certain temperature.If the burner and circulating fan are suddenly shut down when the furnace is stopped, the temperature of the burner and combustion chamber will rise sharply due to the lack of cooling, which will damage the burner and combustion chamber.In addition, after the burner fan is stopped, the high-temperature radiation in the furnace will also damage other parts of the burner.Therefore, for some heating devices with higher furnace temperature, it is best to use the burner with the function of blowing after the furnace is stopped, that is, the burner fan and circulation fan continue to operate for a period of time when the shutdown, waiting for the combustion chamber temperature to be reduced appropriately, and then stop the operation of the combustion fan.In addition, for some large and medium-sized gas burners, in order to ensure that the shutdown of the furnace to clean up the residual gas may accumulate in the furnace, generally should be selected after the purge function of combustion