Now let's look at the difference between primary air and secondary air of natural gas burner. The primary air is used to transport and heat the pulverized coal, so that the pulverized coal is sent to the furnace through the primary air pipe, and can supply the oxygen required for the ignition and combustion of the volatile in the pulverized coal. The primary air adopts hot air to supply the pulverized coal, and also has the function of preheating the pulverized coal.

   Its function is not only to maintain a certain concentration of gas powder mixture for transportation, but also to provide sufficient oxygen for the fuel in the early stage of combustion. Primary air can be divided into cold primary air and hot primary air. Hot primary air is used to ensure a certain temperature when pulverized coal enters the boiler and improve energy utilization. The cold primary air is used to adjust the temperature of the hot primary air to ensure a high heat exchange rate.

   The secondary air is the hot air sent into the furnace through a separate channel of the burner, which is gradually mixed with the primary air after entering the furnace. The secondary air provides oxygen for carbon combustion, strengthens the disturbance of air flow, promotes the reflux of high-temperature flue gas, promotes the mixing of combustibles and oxygen, and provides conditions for complete combustion. The air volume of secondary air is larger in primary air and tertiary air, accounting for a considerable proportion in the total air volume.

   According to the working principle of natural gas burner, the burner can be defined as a kind of equipment that converts substances into heat energy through the chemical reaction of combustion - that is, air and fuel are mixed in an appropriate proportion through the premixing device to make them burn fully. According to the combustion control mode of burner: single-stage fire burner, double-stage fire burner and proportional regulation burner. According to the fuel atomization mode, it is divided into mechanical atomization burner and medium atomization burner.