Efficient conventional and alternative fuel firing with our kiln burner
Our high-substitution-rate kiln burner for alternative fuels firing
Our JETFLEX® Burner is a highly flexible kiln burner, designed to produce the best flame shape and lowest NOx emissions for various fuel types and operating conditions. It fires rotary kilns with pulverised coal or coke, oil, natural gas, or any mixture of these fuels. Alternative fuel firing of plastic chips, wood chips and sewage sludge can also occur through the same common fuel channel.
The JETFLEX Burner is available for any fuel combination and maximum capacity ranging from 10 to 250 MW, catering for even the largest of rotary kilns. The primary air supply to the kiln burner enables a flame momentum of 7 N/MW up to 11 N/MW.
We offer two kiln burner models: The standard JETFLEX® Burner and the JETFLEX® PLUS Burner.
Keeping it simple, the standard JETFLEX Burner has no moving parts, offering easy operation and reliability as fewer parts are exposed to wear. The kiln burner flame shape or momentum is easily controlled by simple regulation of the primary air pressure and flow. If you find a series of optimum kiln burner settings work for you, these can be easily repeated. This improves plant production by enabling smooth transition between production qualities or fuels.
JETFLEX PLUS Burner
For optimum combustion flexibility, our JETFLEX PLUS Burner offers superior combustion of cost-effective grade fuels, complete flame-forming control and increased fuel retention time. The two design features that characterise the JETFLEX PLUS Burner model are rotatable jet air nozzles and a retractable centre pipe for alternative fuel firing.
The concentric placement of the rotatable jet air nozzles enables high suspension of the fuel inside the flame. The swirler is the main mechanism for shaping the flame during start-up and daily operation.
Flame shape matters
Having full and effective control over flame shape is crucial for efficient kiln burner operations. The rotatable nozzles on the JETFLEX PLUS allow the flame to be shaped exactly as required by the fuel and process. The rectangular jet air nozzles have a relatively higher surface area than circular nozzles, facilitating fast and powerful mixing of fuel and hot secondary air, ensuring fast ignition and stable flame formation.
Fast and easy shipping
Both JETFLEX Burner designs are optimised for reduced container shipment cost and time as the design incorporates a simplified structure with a detachable beam and reduced overall length. A JETFLEX Burner with up to nine-metre kiln burner pipe length would typically be shipped in a container.
Dynamic kiln burner design to maximise your alternative fuel firing
- Lower operating and maintenance costs
- The highly-efficient JETFLEX Kiln Burner lowers fuel and power costs. A common solid fuel channel reduces fuel consumption through minimising cold fuel-conveying air. The simple design of the standard JETFLEX Kiln Burner model has no moving parts, reducing possibilities for wear and therefore, frequency of maintenance. Fuel passes through a straight, uninterrupted pipe, also reducing wear.
- Superior flame shaping
- The high velocity axial jet air nozzles play a vital role in fast and powerful mixing of fuel and hot secondary air, enabling rapid ignition and stable flame formation. Increasing the swirl air leads to a shorter, wider and more intense flame.
- Increased firing of alternative fuels
- The smart design of both of our JETFLEX Kiln Burner models allows for increased firing of alternative fuels such as plastic chips, wood chips and sewage sludge.
- Long refractory life
- A highly-efficient fuel combustion process and flame formation capability ensure stable kiln coating, therefore long kiln refractory life time.
- Lower emissions
- Our design encompasses the well-proven principle of having a fuel-rich flame core with all flame-shaping primary air surrounding the fuel. Combined with a short ignition distance and a compact flame, this minimises thermal NOX generation.
Overcome alternative fuel firing challenges with our kiln burner
Rectangular jet air nozzles and swirler improves ignition and flame formation
The axial air nozzles form flat rectangular high-velocity jets with a relatively large surface area compared with a circular nozzle, ensuring fast ignition and stable flame formation. The jet air nozzles are placed concentrically, surrounding the fuel, enabling high suspension of the fuel inside the flame.
The swirler is the main mechanism for shaping the flame during start up and daily operation. Increasing the swirl air leads to faster mixing and a shorter, wider and more intense flame. The combined effectiveness of the JETFLEX Burner’s rectangular jet air nozzles and swirler has made it possible to eliminate the traditional annular fuel channel.
Fixed jet air nozzles are simple to operate and low maintenance
Suitable for conventional fuel firing and high- or medium-grade alternative fuel firing, the standard JETFLEX Burner has fixed rectangular jet air nozzles that are arranged concentrically, with a fixed angle, surrounding the fuel. This ensures efficient and well-defined mixing of hot secondary air with the fuel.
This model has no moving parts, offering simplicity and reliability as fewer parts are exposed to wear. The kiln burner flame shape or momentum is easily controlled by adjusting primary air pressure and flow where previously used kiln burner settings can easily be replicated.
Rotatable jet air nozzles for maximum flexibility
Rotatable nozzles on the JETFLEX PLUS Burner allow for optimal adjustment of the flame to a narrow or a wide shape, depending on the fuel type and process requirements. The rotatable nozzles can be used for solid alternative fuel firing, helping to increase fuel retention time in the flame. This results in less fuel drop-out, improved combustion, and improved clinker quality. These
nozzles are exchangeable in case of increased production requirements or significant changes in fuel quality.
Straight solid fuel channel for reduced disturbance
Solid pulverised or alternative fuels are injected through a straight, uninterrupted pipe design, in which fuels can pass without disturbance. This reduces wear, maintenance and unplanned kiln stops, offering increased kiln availability. The central part of the JETFLEX Kiln Burner can be configured with one or two solid fuel pipes, depending on the fuel quality and dosing system available.
Common solid fuel channel provides cost savings
Transporting and injecting multiple solid fuels simultaneously in separate injection lines increases the use of cold combustion air to the kiln systems, which increases fuel and power consumption. With our JETFLEX Burner, the use of a common solid fuel pipe for multiple solid fuels, such as coal, petroleum coke and solid alternative fuels reduces heat and power consumption through minimising the cold combustion airflow.