Combustion beam
a thermal tool that provides controllable heating intensity and fuel distribution areas for industrial furnaces.
The combustion beam adopts different burner designs and sizes based on the kiln type and fuel type.
It is equipped with adjustable fuel supply rates and air-fuel ratios to achieve precise control of heating intensity. Currently, the heating capacity of a single combustion beam in the market ranges from 3.92 to 14.5 GJ/h.
The combustion beam can be designed with varying spacing between beams and burners based on kiln size and fuel type. This allows the fuel to be distributed across different zones, achieving the optimal layout for lime calcination.
rectangular heat insulated combustion beam
The types of combustion beams can be categorized into three major types:
1)The first type is the conventional type:
It uses oil cooling or water cooling for thermal regulation, with the main structure being a combustion beam made of alloy steel welded construction.
The structural forms of this type of combustion beam include rectangular combustion beam, T-shaped combustion beam, double T-shaped combustion beam, F-shaped combustion beam, etc. The length of the combustion beam is designed according to the requirements of the beam kiln section, generally between 4 and 8 meters.
The middle of the combustion beam is a cavity, and there are burner holes at the bottom/side of the combustion beam. The fuel is sent into chamber through burnners that installed inside cavity. The combustion air is sent into the kiln through the burner hole. The fuel and combustion air are mixed in the kiln chamber to ensure lime stone around the burner have effectively calcination. The rectangular combustion beam employed side burnners as figure above.
The combustion beams used in the first and second generation beam kilns are both in the form of alloy steel composite welding structures, using thermal oil cooling or water cooling methods. The heat carried out by the circulation of thermal oil or water is discharged into the atmosphere by the fan. The first generation of beam kilns will cause approximately 150-200 Kcal/(kg · finished ash) of heat loss. The second-generation beam kiln causes approximately 200-250 Kcal/(kg · finished ash) of heat loss. Most companys do not recover this portion of heat. However, some large-scale enterprises utilize this heat to generate electricity, achieving maximum resource utilization.
2)The second type is the heat insulated type.
Adopting oil cooling or water-cooling methods, the main structure is an insulated combustion beam made of refractory and steel composite materials.
The third-generation beam kiln adopts an adiabatic combustion beam, and the main body of the adiabatic combustion beam is made of a composite material of refractory and steel, aiming to reduce the heat loss. The third-generation beam kiln causes approximately 20–30 Kcal/(kg of finished lime) in heat loss. The insulated combustion beam is a nationally patented invention (ZL201410094521.8).
3)The thrid type is air-cooling type.
Adopting the cooling form of air cooling, the main structure is an insulated combustion beam made of refractory and steel composite materials (national invention patent ZL201610004568.9).
The fourth and fifth generation beam kilns use air-cooled combustion beams, which are cooled by combustion air. The combustion air preheated by the combustion beam directly participates in combustion, completely eliminating the heat loss of the combustion beam.
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