Design and calculation of atmospheric burners
Head calculations
The design calculation of the head is based on the principle of ensuring stable combustion. A properly designed head must prevent the flame from leaving flames, backfire and yellow flame, and make the flame characteristics meet the needs of the heating process.
(1) Select the fire hole thermal intensity or the fire hole exit velocity to determine the total area of the combustion fire hole.
The burning ability of a fire hole can usually be expressed by the heat intensity of the fire hole or the speed of the gas-air mixture leaving the fire hole. When designing the burner head, it is important to correctly select the burning capacity of the flame hole. In order to ensure the stability of combustion conditions, the appropriate flame hole heat intensity or flame hole exit velocity value is usually selected based on the combustion stability range curve and within the parameter range determined by the flame separation and tempering curves.
(2) Determine the size and number of fire holes
Under a certain thermal load, the size of the fire hole will affect the thermal intensity of the fire hole or the value of the fire hole exit velocity, thus affecting the stability of combustion. According to the theory of flame propagation and combustion stability, it can be known that the larger the fire hole size, the faster the flame propagation speed, and the easier it is to backfire; the smaller the fire hole size, the slower the flame propagation speed, and the easier it is to defire.
According to the different properties of the gas, the corresponding fire hole size range can be found and selected.
According to the total area of fire holes and the selected fire hole size, the number of fire holes can be determined. The hole depth and fire hole arrangement can then be determined.
Characteristics of atmospheric burners
It has complete combustion, moderate flame length, strong firepower, high combustion temperature, and high combustion thermal efficiency; it saves power and is easy to adjust; it has a wide load adjustment range and strong adaptability, which can meet a variety of process requirements.
The function of the ejector
Inject air with gas to mix it evenly
Residual pressure is formed at the end of the ejector to ensure combustion
Deliver gas to provide the heat load required by the burner.
The function of the burner head
Evenly distributes the gas-air mixture to each flame hole and produces stable and complete combustion