Self-preheating burner, also known as heat exchange burner, its working principle is to preheat air or gas inside the burner, so as to improve combustion efficiency and save fuel. The following is its specific working mechanism and characteristics:

Working mechanism

Preheating process:

The self-preheating burner has a counter-flow heat exchanger mounted outside the burner body. This heat exchanger preheats the combustion air required by the burner. The heat exchanger primarily uses several concentric tubes to separate the air from the flue gas, with the central tube serving as the heat exchange surface. The entire heat exchanger is typically made of heat-resistant steel.

combustion processes:

The fuel products are ejected from the nozzle at a speed of about 80 ms. This high exit velocity facilitates good recirculation of the furnace gas, thereby improving the heat transfer process and achieving better temperature uniformity. With the help of the air ejector inside the flue, the combustion products are drawn through the heat exchanger, and the pressure within the furnace can be adjusted by changing the amount of injected air.

Energy saving effect:

Because the burner is preheated with air or gas inside, it can reduce fuel consumption by 20 to 30 percent compared to a burner that does not recover waste heat from flue gas. In addition, it can be installed as easily as a normal burner and has a volume of only one tenth of that of a flue heat exchanger.

design feature

Counter-current heat exchanger: the main structural feature of the self-preheating burner is the use of a counter-current heat exchanger, which separates air and flue gas through several concentric tubes, with the middle tube as the heat exchange surface, all made of heat-resistant steel.

High temperature applicability: This burner is suitable for industrial furnaces with a working temperature range of 600~1400 C, especially in high temperature furnaces above 1000 C.

matters need attention

When using your own preheating burner, pay attention to the following points to ensure safety and efficiency:

Cleaning before ignition and after extinguishing: Ensure that the burner is clean to avoid residual matter affecting combustion efficiency.

Observation of flame in combustion: real-time monitoring of flame state, timely detection and solution of abnormal conditions.

Correct operation sequence: the induced fan or combustion fan must be opened first, and then the fuel gas valve should be opened; when stopping, the fuel gas valve should be closed first, and then the induced fan or combustion fan should be closed.

application area

Self-preheating burner is widely used in various industrial furnaces, such as forging furnace, steel ladle roasting furnace, heat treatment furnace and molten aluminum furnace, etc., which not only improves the heating uniformity and heating quality, but also significantly reduces fuel consumption, with good energy saving effect.

To sum up, the self-preheating burner can realize efficient energy recovery and utilization by preheating air or gas inside the burner, which significantly improves combustion efficiency and reduces fuel consumption. It is suitable for a variety of high-temperature industrial furnace application scenarios.