Multi-channel burners are primarily categorized into single-fuel burners—such as those using natural gas, coal gas, diesel, heavy oil, or pulverized coal—as well as four-channel burners. Following this are dual-fuel or multi-fuel burners capable of combusting gases and oils simultaneously, for instance, natural gas. + Coal gas, biomass gas + Natural gas burner; gas + Solid combustors, such as pulverized coal + Natural gas multi-channel burner, grain + Natural gas multi-channel burners, and more; gases + Liquid multi-channel burners, such as natural gas + Diesel and other multi-channel burners, as well as the front-end dynamic pressure of multi-channel natural gas burners: 40-60KPa Right, the dynamic pressure of the gas burner depends on the actual operating conditions—aim for a slightly higher pressure whenever possible.

1. Four-Channel Burner

1. Overview

Zhongwei GX The series of highly efficient, energy-saving four-channel burners was specifically developed and designed for firing gaseous fuels in rotary kilns. Its unique structure and optimally tailored process parameters ensure thorough mixing of the gaseous fuel with air, as well as primary and secondary air streams—resulting in high thermal intensity, exceptional combustion efficiency, and effortless adjustment. Currently, these burners have been widely adopted in nearly a thousand rotary kiln systems across industries such as cement production, lime kilns, chromate plants, lithium carbonate manufacturing, metallurgy, oxide pelletizing, ceramic aggregate production, magnesium oxide processing, and chemical manufacturing. Their successful applications span not only throughout China but also extend to numerous countries and regions around the globe.

  2. How it works:

Gas fuel is ejected outward from the gas pipeline in a swirling motion at a specific diffusion angle, receiving significant momentum and angular momentum from the adjacent swirling air flow. This high-speed, spiraling jet continues to spread radially while meeting the rapidly discharged axial air stream. The penetration of the axial air stream further enhances the mixing of gas fuel with air—including the surrounding secondary air—and allows for dynamic adjustment of the flame’s divergence. By doing so, the flame’s length, thickness, and overall shape can be precisely tailored to meet the specific requirements of the calcination process. Meanwhile, the central air flow plays a crucial role in promoting the combustion of the small amount of gas fuel concentrated in the core region. CO Combustion is enhanced to ensure more complete burning and also serves to stabilize the airflow. Thanks to this combustion mechanism, combined with the high velocities of swirling and axial airflows, both the combustion rate and efficiency are effectively maintained.

Figure 2-1: Flowchart of a Gas Burner

Image  3 -2 Multi-channel structural diagram

As shown in the figure, it consists of pipelines, nozzles, an ignition device, a metal bellows compensator, a butterfly valve, pressure-measuring instruments, and a high-temperature-resistant castable protective layer, among other components.

Piping system: Composed of five channels from outer to inner, namely the axial-flow duct, gas-fuel duct, swirl duct, central duct, and ignition channel. Since the ignition channel is used only during ignition, it is conventionally referred to as the four-channel system.

Nozzle: Machined from special materials, the nozzle features adjustable cross-sectional areas at each pipe's outlet, allowing precise control of the ejected air velocity. It is one of the critical components that ensure both the shape and longevity of the flame.

Ignition device: Located within the central air passage, the high-energy igniter enables automatic ignition.

Metal bellows compensators are the primary components used to connect pipelines, seal joints, and adjust flame shapes, allowing the connected pipes to move axially.

Butterfly valve: Used to regulate airflow. This burner is equipped with a manual-adjustment butterfly valve, which controls the flow of center air, swirl air, inner axial air, and outer axial air individually. The ignition section features a manual butterfly valve specifically designed to adjust the flow rate of the pilot gas.

Pressure measurement instrument: Indirectly indicates the air outlet velocity inside the burner. Protective layer: Specifically, the refractory cast-in-place layer, which is either pre-cast by the manufacturer before shipment or, in special cases, poured on-site.

 

 

Figure   2-3  4 Channel Burner Air Disc

Image   2-4 4 Channel Burner Example

(II) Multi-Channel Dual-Fuel Co-Firing Burner

Our company has specially developed and designed a multi-channel, dual-gas co-fired burner for burning multiple gaseous fuels in rotary kilns. This burner not only retains the advantages and features of conventional multi-channel burners but also enhances fuel flexibility, effectively addressing the challenge faced by users who previously relied on a single fuel type that couldn’t meet their production needs. Currently, it has been widely applied in various industries. Domestic and Foreign Highly praised by users across various cement plants, chemical facilities, metallurgical industries, ceramic granules and sand operations, pelletizing units, and lime rotary kilns.

Image   2-3 Dual-fuel multi-channel structural diagram

Image   2-4 Dual-fuel co-firing flowchart

This model of burner is available in both adjustable and non-adjustable versions based on the cross-sectional area at each channel outlet. This section introduces the adjustable type, which consists of tubing, nozzles, a butterfly valve, pressure-measuring instruments, and a protective layer, among other components.

Piping: Consists of five layers, from outer to inner. A channel , namely the axial air duct, main gas duct, auxiliary gas duct, swirl air duct, and central air duct.

Nozzle: Machined from special materials, it ensures the shape of the flame and Use One of the key components of longevity.

Butterfly valve: Used to regulate airflow. This burner is equipped with 3 A manual butterfly valve is used to individually adjust the flow rates of center air, swirl air, and axial air.

Pressure measuring instrument: Indirectly displays the gas velocity at each burner nozzle and the pressure of the fuel gas.

Protective layer: also known as the fire-resistant cast layer, Factory output Pouring Finished 。

1. Working principle:

Gas fuel is ejected outward from the gas nozzle in a swirling motion at a specific diffusion angle, propelled by the swirling air flows—both inner and outer—that impart significant momentum and angular momentum, enabling it to advance spirally at high velocity while continuing to spread radially until it meets the rapidly discharged axial-flow air jets. The introduction of these axial-flow jets further enhances the mixing of gas fuel with air (including the surrounding secondary air), allowing precise control over the flame’s dispersion characteristics. This enables users to adjust the flame’s length, thickness, and overall shape according to their specific needs. Meanwhile, the central air flow plays a crucial role in facilitating the combustion of the small amount of gas fuel concentrated in the core region. C O Combustion is enhanced for greater efficiency and also serves to stabilize the airflow. Thanks to this combustion mechanism, combined with the high velocities of swirling and axial airflows, rapid and complete combustion is achieved.

(III) Multi-Channel Coal-Gas Mixed Combustion Burner:

1. Overview

Our company has specially developed a multi-channel coal-gas co-fired burner designed for burning pulverized coal in rotary kilns. (Or rice bran 、 Rice bran 、 Bamboo powder, etc. Developed and designed for both gaseous and liquid fuels, the burner not only retains the advantages and features of the five-channel burner but also enhances fuel flexibility, effectively addressing the issue of users being unable to meet production demands with a single fuel type. Currently, it has been successfully applied in pelletizing and ceramic bead processes within the chemical and metallurgical industries. ( Sand ） , highly praised by users on the lime rotary kiln.

This burner typically operates by co-firing pulverized coal and gaseous fuel, but it can also be configured to burn either pulverized coal or gaseous fuel individually.

Image  4 -1 Multi-channel coal + Air-Combined Combustion Type Structural Diagram

2. Burner Structure Description:

The multi-channel coal-gas co-fired burner consists of pipelines, nozzles, metal bellows compensators, butterfly valves, pressure measuring instruments, and a protective layer, among other components.

Piping: Consists of six layers from outer to inner, starting with the outer layer Axis Flow duct, Burn Air passage, Coal powder channel, swirl Flow duct and central duct , ignite the gas pipeline.

Nozzle: Manufactured from special materials, serving as the spray outlets for each pipeline. Cut The area is adjustable, allowing for regulation. Fuel The ejected air velocity is one of the key components that ensures both the flame shape and the lifespan of the device.

Metal bellows compensators are the primary components used to connect various pipelines, seal connections, and adjust the flame shape. Pressure measuring instruments indirectly display the velocity and pressure in each air duct within the burner.

Protective layer: also known as the fire-resistant cast layer, Factory before leaving the factory Pouring;

The inlets of the axial flow, swirl flow, and central flow are all equipped with butterfly valves, allowing individual adjustment of each airflow ratio. By turning the adjusting nuts, the ducts can be pressed inward or pulled outward, and by modifying the size of the spray areas on each duct, the velocity of the expelled air can be precisely controlled.

Image   3-2 Coal powder + An example of a natural gas-fired multi-channel burner

(4) Fuel Burner

1. Overview

Fuel-based multi-channel burners primarily involve diesel, heavy oil, waste tire oil, methanol, eco-friendly fuel oils, and other chemical-grade oils. The advantages of fuel-based multi-channel burners are: 1 • High calorific value; 2 , complete combustion; 3 , Excellent energy-saving performance.

2. Installation Flowchart (for reference):

Figure 4-1: Installation Diagram of the Fuel Burner

Figure 4-2: Physical View of the Multi-Channel Fuel Burner

5. Other supporting services

Our company also provides complementary design and supply of rotary kiln cylinder scanners (referred to as "Cylinder Scans") and high-temperature cameras, which can deliver 400 Degree, 700 Degree, 1000 Degree, 1800 High-temperature cameras with advanced features, along with cooling systems such as water and air cooling.

Image  5 High-temperature-resistant camera

Furnace Cylinder Infrared Scanning Thermometer Infrared scanning temperature measurement system

1. Rotary Kiln Infrared Scanning Temperature Measurement System ( Abbreviated as "Tube Sweep" ) , various rotary kiln temperature measurement systems, infrared non-contact temperature measurement systems ;

2. Offering a wide range of cylinder sweep accessories ( Infrared unit detectors, infrared lenses, infrared-transmitting films, motors, proximity switches, fiber optic transceivers, and more )

Image  6 High-temperature-resistant camera

Address: No. 118, Fengqing Road, Jinshui District, Zhengzhou City
Tel:+86-371-60960056
Mobile:+8613849187223
Email:zhongweigongyelu@126.com