A-MAX's own preheating burner
Features: can be used for direct heating and indirect heating
1. Economical and energy-saving, the air can be preheated to 700℃
2. Modular design for easy maintenance
3. Suitable for pulse control
4. Due to the staged combustion, the combustion is more environmentally friendly
5. A single electrode is used for ignition and detection
6. Multiple models, wide output range, 15-250KW
7. Efficient ceramic and heat resistant steel heat exchangers
1 Application
1.1 Indirect heating
The radiant tube works with a hot metal or ceramic radiant tube in conjunction with an A-MAX burner. As the combustion gas flows through the radiant tube, it is emitted.
1.2 Direct heating
In direct heating systems, burners are used together with injectors to extract flue gas to save energy. Industrial furnaces and combustion systems can be used in the steel industry and non-ferrous metal industry.
1.3 Application examples
1.3.1 Indirect heating applications
The combustion gases are rapidly ejected from the combustion chamber, leading to flue gas recirculation, which can reduce nitrogen oxide emissions and evenly heat the radiant tubes. When the high-temperature flue gas is extracted from the outer wall of the heat exchanger, it heats the heat exchanger. The combustion air passing through the heat exchanger is also heated by it. Convection heat transfer can heat the combustion air up to 700℃, with specific effects depending on the model.
1.3.2 Direct heating applications
The self-preheating burner is used for direct heating with a ejector. The ejector draws the flue gas out of the furnace and heats the combustion air as it flows through the heat exchanger. The heating effect varies depending on where it is applied, up to 700℃.
2 Mechanical structure
The self-preheating burner consists of four modules: the burner housing, heat exchanger, air duct, and burner core. The modular design helps the burner adapt to a variety of applications or integrate into an existing combustion system, reducing maintenance time and allowing for direct replacement with continued use.
2.1 Burner housing
The burner housing can fix the burner plug. It is made of high quality aluminum, light weight and double-layer structure. The combustion air flows through the annular gap to cool the housing and reduce emissions.
2.2 Heat exchanger
ceramic heat exchanger
The heat exchanger is made of silicon carbide, with a special surface structure to achieve high efficiency heat transfer. Cast steel heat exchanger
The heat exchanger has a large number of fins to provide a great heat transfer area, even when the temperature of the recirculation flue gas is low, it can effectively heat transfer.
Metal straight tube heat exchanger
As a low cost alternative to cast steel heat exchanger, the heat transfer efficiency is low and it is suitable for applications with low furnace temperature.
2.3 Air duct
A-MAX..C The self-preheating burner has a ceramic air conduit of suitable size, and the 0-3 models are used as combustion chambers at the same time. A-MAX..M The air conduits used by A-MAX..FTR are made of heat-resistant steel.
2.4 Burner core
The burner core is connected to the housing by a flange and the electrodes are used for ignition and detection at the same time. The A-MAX..M and A-MAX..FTR burner cores have combustion chambers.
3 Working principle
The self-preheating burner uses the heat exchanger to heat the combustion air with flue gas. After entering the burner, the combustion air flows through the jacket of the shell. A small portion of the combustion air enters the interior of the air duct and participates in the primary combustion inside the combustion chamber. The majority of the remaining combustion air passes through the gap between the air duct and the heat exchanger, reaching the space outside the heat exchanger head and combustion chamber, where it splits into two streams. One stream returns to the primary combustion chamber, while the other is ejected at high speed through the gap between the combustion head and the heat exchanger cap to participate in the secondary combustion. This staged and high-speed combustion means less pollutant generation.
