A liquefied petroleum gas (LPG) burner is a device used to burn liquefied petroleum gas, operating similarly to natural gas burners. Although the search results do not directly mention LPG burners, we can infer their operating principles from those of natural gas burners, as they share similar basic mechanisms.

1. Combustion process

The working principle of liquefied gas burner mainly involves the following steps:

Gas supply: liquefied gas is delivered to the burner through a pipeline.

Air mixing: LPG and air are mixed inside or outside the burner. The mixing can be pre-mixed or external.

Ignition: The mixture of gases is ignited by the ignition device to produce a flame.

Combustion: The flame continues to burn at the burner outlet, producing high temperature gas.

2. Hot air circulation

Similar to natural gas burner, liquefied gas burner can also promote the circulation of air in the furnace through high-speed hot gas, uniform furnace temperature, reduce the temperature difference between flame and workpiece, and effectively improve the thermal utilization rate of the furnace.

3. Stable combustion

In order to ensure the stability of combustion, the LPG burner needs to prevent flashback and deflagration:

Reburning: The phenomenon of flame propagation into the burner when the flame propagation speed exceeds the speed at which the fuel and air mixture passes through the nozzle. Pre-mixed and semi-pre-mixed burners are at risk of reburning.

De-ignition: The phenomenon in which the fuel and air mixture flows faster than the flame propagation speed, resulting in the flame leaving the stable point. De-ignition is usually the main cause of flame extinction.

In order to prevent these phenomena, liquefied gas burner usually adopts measures such as flame stabilizer.

4. Ignition system

The ignition system of a LPG burner usually consists of the following parts:

Blow out the furnace: Before ignition, the furnace needs to be blown out to ensure that there is no flammable gas in the furnace.

Igniter is energized to ignite: the igniter is energized to produce a spark.

Delayed opening of the solenoid valve: The solenoid valve opens after a delay after the igniter fires, so that the liquefied gas enters the burner.

The detection device detects the flame: after the flame detection device detects the flame, the controller receives the signal and keeps the solenoid valve open so that the gas burns normally.

If the ignition fails or the burner is out of fire, the detection device cannot detect the flame, resulting in the electromagnetic valve closing and the burner extinguishing.

5. Application scenarios

Liquefied gas burners are widely used in various heating equipment, such as industrial furnaces, household gas stoves and so on. They may need to work in high temperature, high pressure, low temperature, negative pressure or special fuel environment, so they have high requirements for stability, reliability and safety.

Through the above analysis, we can see that the working principle of liquefied gas burner is similar to that of natural gas burner, mainly involving gas supply, air mixing, ignition, combustion and hot gas circulation and other processes. In order to ensure the stability of combustion, liquefied gas burner needs to take measures to prevent flashback and fire off phenomenon.