The core ignition and combustion principle of pulverized coal burners is based on plasma ignition technology. Unlike traditional ignition methods, this technology utilizes a high-power electric arc to directly ignite pulverized coal, achieving rapid ignition and strong combustion stability. The specific working process can be divided into three steps:

Plasma Generation

Within a medium-pressure environment exceeding 0.01 MPa, the ignition device generates an arc by passing a direct current exceeding 200A through contact between the cathode and anode. Under the influence of a strong magnetic field, this creates a stable-power direct-current air plasma. Its power can be continuously adjusted between 50 and 150 kW, with the plasma core temperature reaching 6000°C, providing an ultra-high-temperature heat source for coal powder ignition.

Rapid Coal Powder Ignition

After primary air and coal powder enter the plasma ignition burner, dense-phase coal powder first enters the plasma torch’s central zone, igniting rapidly within approximately 0.1 seconds. The ignited dense-phase coal powder releases substantial heat, providing a high-temperature heat source for the dilute-phase coal powder, enabling its rapid ignition and ultimately forming a stable combustion flame.

Equipment Cooling Protection

The burner walls employ gas film cooling technology to effectively reduce surface temperatures, preventing high-temperature damage and slagging. Simultaneously, deionized water cools the electrodes and coils, ensuring equipment stability and longevity in high-temperature operating environments.

An excellent pulverized coal burner combines multiple characteristics such as high efficiency, flexibility, energy savings, and environmental friendliness, adapting to diverse industrial production demands. Its core features are primarily reflected in the following aspects:

Flexible Adjustment Methods

Under fixed airflow conditions, the burner freely adjusts the ratio of internal and external air, altering the jet stream state to effortlessly accommodate different furnace operating conditions and combustion requirements for varying coal qualities. Both flame length and shape can be customized as needed.

High Combustion Efficiency

Coal powder remains longer in the burner’s high-temperature zone, ensuring more complete combustion. With low fuel quality requirements, it accommodates substandard coal fuels, significantly boosting industrial production economics. Post-combustion flue gas appears as white mist with no visible black smoke, resulting in cleaner emissions.

Significant Energy Savings

Reducing airflow by 1% decreases energy consumption by 8.70–10.46 kJ. Simultaneously, it elevates secondary air temperature, further lowering coal consumption and reducing energy costs in production processes.

Easy Ignition, Rapid Heating

The equipment ignites effortlessly, with furnace temperatures rising swiftly post-ignition. This effectively shortens preheating time, enhances industrial production efficiency, and meets the demands of continuous production rhythms.

Excellent Temperature Uniformity

The burner maintains a uniform internal temperature distribution, ensuring broad heat coverage within boilers/kilns. High-temperature heating leaves no dead zones, preventing slag adhesion to workpiece surfaces and significantly improving product processing and calcination quality.

Adjustable coal consumption and airflow

Flexibly regulate burner air supply and coal feed based on production needs. Wide adjustment range for furnace temperature and flame length accommodates diverse heating requirements across different capacities and processes.

Advanced structure with superior comprehensive performance

The equipment features a neat appearance, complete accessories, low system resistance, flexible flame adjustment methods, and convenient daily maintenance. Special designs like multi-channel configurations ensure high pulverized coal combustion efficiency, achieving overall performance at internationally advanced levels.

Minimal furnace wear and extended service life

Effectively reduces flame damage to furnace bricks, decreases maintenance frequency, prolongs the lifespan of both the furnace and burner, and further lowers production and operational costs.

Pulverized coal burners have become core heating equipment across multiple industrial sectors due to their stable high-temperature output, flexible adjustment capabilities, and broad fuel adaptability. They serve key industries including power generation, building materials, metallurgy, and chemical processing. Specific application scenarios include:

Thermal Power Plants

As the core component of coal-fired boilers, they provide efficient and stable heat sources for large-scale power generation, offering flexible load adjustment capabilities. They are widely used in public power stations and industrial captive power plants.

Cement & Lime Rotary Kilns

Deliver continuous, stable high-temperature heat for cement clinker calcination and lime burning. Modern multi-channel pulverized coal burners enhance kiln operational stability, reduce coal consumption, and lower nitrogen oxide emissions, aligning with the cement industry’s environmental production requirements.

Asphalt Mixing Plants

Serving as the standard heat source for aggregate drying, these systems significantly reduce fuel costs in asphalt processing. Their combustion emissions meet environmental standards for road construction projects, making them critical equipment in the road building sector.

Metallurgy & Chemical Industry

Applied in steel sintering, alumina kilns, smelting furnaces, and chemical process heating, it delivers stable high-temperature heat under harsh conditions while supporting multi-fuel co-firing to meet complex production demands in chemical and metallurgical processes.

Building Materials & Ceramics Industry

Employed in glass melting furnaces, ceramic firing lines, brick kilns, and similar equipment. Its precise temperature control effectively enhances the quality and yield of building materials like glass, ceramics, and bricks.

Industrial Boilers & District Heating

Supplies heat for steam generation, hot water production in factories and processing plants, and urban district heating systems. Featuring high combustion efficiency and simple operation, it meets large-scale heating and steam supply demands.

Key Selection Points

Match Core Requirements

Select a pulverized coal burner with corresponding processing capacity based on furnace/boiler dimensions and actual thermal load demands. Avoid over- or under-sizing to ensure combustion efficiency.

Prioritize Eco-Friendly Models

Opt for swirl-stabilized pulverized coal burners with low NOx emissions. These meet national environmental standards while enhancing combustion stability.

Match Coal Characteristics

Select burner models compatible with the fineness, moisture content, and volatile matter of commonly used coal types to ensure complete combustion.

Maintenance Techniques

Raw Material Control

Strictly manage coal powder fineness and dryness quality. Meeting standards for fineness and moisture content is fundamental for stable combustion, reducing issues like nozzle clogging and incomplete combustion.

Routine Cleaning and Inspection

Regularly clean burner nozzles, inspect air ducts for blockages or damage, and promptly calibrate control systems to ensure precise equipment parameters.

Safety Configuration

Equip automatic ignition and flame monitoring devices to continuously monitor combustion status, preventing safety incidents like flameout or flashback to safeguard production safety.

Wear Part Replacement

Timely inspect and replace burner wear components and refractory linings to prevent combustion efficiency loss or equipment safety risks caused by component damage.

Core pulverized coal specifications must satisfy:

Fineness: 80–100 mesh (90% passing 200 mesh)

Moisture content ≤10%: Dry coal ensures stable feeding

Ash content ≤25%: Low ash reduces equipment slagging

Volatile matter ≥18%: Sufficient volatiles facilitate ignition

This indicates incomplete combustion, primarily caused by insufficient air supply or poor coal-air mixing. Check: secondary air damper opening adequacy, coal fineness (avoid excessive coarseness), and nozzle/air duct blockages.

Main causes include: excessively high coal moisture or excessive fine particles; ash and slag buildup in nozzles or air ducts; poor coal grinding quality resulting in uneven particle size; insufficient purge air pressure preventing timely removal of accumulated material from nozzles.

Yes. Modern low-NOx pulverized coal burners support co-firing with alternative fuels like biomass or sludge. This approach reduces coal consumption while further lowering pollutant emissions, aligning with green production principles.

Daily: Inspect coal feeding status, verify air pressure stability, and confirm normal flame combustion conditions;

Weekly: Clean nozzles and assess wear on ignition electrodes;

Monthly: Calibrate control systems and replace worn small components;

Quarterly: Conduct comprehensive maintenance on pulverizers and inspect the integrity of refractory linings.