Self-priming burner, also Kiln Venturi burner, can use natural gas, liquefied gas as fuel, because of its own venturi structure, does not need external combustion fan, simple structure, less investment cost, is often used burner in modern kiln, is particularly widely used in shuttle kiln.

The appearance of self-priming burning mouth seems to have simple structure, but if the design is unreasonable in the design, it may make the combustion effect is not ideal, and even affect the normal production. At present, most of the self-priming burner used are low-pressure burner, which belongs to the working principle of normal pressure suction and low pressure introduction.

Natural gas or liquefied petroleum gas enters the nozzle under a certain pressure, and the pressure of the gas will decrease after the nozzle, and the gas flow rate will increase, and the gas at high speed has high kinetic energy. Due to the exchange of air momentum, part of the air will be brought into the nozzle tube at a certain speed. During momentum exchange, the speed of gas decreases and the speed of air increases. When the airflow enters the mixing pipe, the speed is not uniform, in the flow process, the gas dynamic pressure head will reduce, one part will overcome the resistance, the other part is to transfer to the air, so that the air dynamic pressure increases. In the outlet speed field of the mixing pipe is evenly distributed, the mixing speed of the gas air is increased compared with the previous part of the gas pressure. After the expansion pipe, part of the dynamic pressure is converted into static pressure, the speed decreases, the pressure rises, and the ignition point at the fire vent.