What is the MF-Series Coal Burner?
Case Study: Most of the existing asphalt mixing equipment uses diesel or heavy oil as fuel to heat the aggregates. However, with the continuous increase in energy prices and the growing market competition, fuel has become a bottleneck in reducing the cost of asphalt mixing materials. As a result, many construction units have started to convert their original fuel burners into coal powder burners to lower production costs. However, these old-fashioned coal powder burners have some serious shortcomings during use, such as severe slagging in the furnace and difficult cleaning; low thermal efficiency leading to significant coal powder wastage; incomplete coal powder combustion, resulting in a large amount of unutilized coal powder in the recycling system; high failure rate and short service life of the burners, especially the burner nozzle needing replacement every 15-30 days, which seriously affects the normal production of users.
Based on the above situation, our company invited relevant experts to participate in research and development and collaborated with a large refractory material factory to transform the burner in several aspects:
- Based on the combustion mechanism of coal powder under different media, particle sizes, temperatures, concentrations, etc., rational improvements were made to the spatial dimensions, air ducts, and coal passages of the combustion chamber. This ensures uniform mixing and complete combustion of the coal powder inside the combustion chamber, resulting in high flame temperature, powerful firepower, fuel-saving, and minimal pollution.
- Considering the continuous operation of the burner for 8-10 hours, the refractory material factory conducted multiple tests and successfully developed high-performance specialized refractory bricks suitable for this specific condition. The service life of these bricks is 3-6 times that of similar products.
- The new modular structure divides the burner into two parts: the barrel and the rear cover, making it convenient for use and daily maintenance.
This new type of burner is currently one of the most advanced coal powder combustion heating devices in the domestic market. It can be used in conjunction with stationary or mobile asphalt mixing machines ranging from 60 tons to 400 tons per hour. For each ton of finished mixed material production, if using fuel oil, it requires approximately 7.5 kg of fuel oil. However, when using the coal powder burner, it only needs around 10 kg to 14 kg of coal, significantly reducing production costs and significantly improving economic efficiency. Therefore, this product is an excellent energy-saving and efficient equipment for municipal highway construction projects.
What is the Working Process of Coal Burner?
Coal with a particle size below 15mm is pulverized by the coal pulverizer, and then it enters the coal duct through a metal hose, and is injected into the combustion chamber of the burner. It is ignited by the oil igniter. At the same time, the blower blows air into the combustion chamber through the main body’s air duct, creating an air flow that closely adheres to the inner wall and rotates forward. This airflow entrains high-temperature flue gas and vigorously mixes it with coal powder for combustion. The high-temperature flame is sprayed into the drying drum through the flame nozzle to heat the aggregates.
What is the Fuel Requirements of the Coal Burner for Asphalt Mixing Plant?
- Igniter fuel uses 0# diesel fuel.
- Coal quality for production:
- Feed particle size <15mm, after grinding the particle size must be controlled around 200 mesh (with an error of ±10%).
- Calorific value ≥60000Kcal/Kg.
- Ash content ≤5%.
- Volatile matter ≥28%.
- Moisture content controlled ≤1%.
- Sulfur content (S) <1%.
Why Choose MF-Series Coal Burner?
- Successfully Achieved Dual-Fuel Capability: Our coal powder burner is designed to operate with both coal and fuel oil, providing versatile and cost-effective fuel options.
- Groundbreaking Application of Low Volatile Coal: We have pioneered the use of low volatile coal in our burner, showcasing our commitment to innovation and efficiency.
- Dynamic Combustion with Strong Swirling Airflow: By incorporating a powerful swirling airflow and mechanical automatic rotation, our burner achieves dynamic combustion, significantly reducing production costs.
- Unprecedented 1:5 Modulation Ratio: Our coal powder burner boasts an industry-leading 1:5 modulation ratio, allowing for precise control and optimal fuel efficiency.
- Enhanced Firebox-Coal Combustion: Through successful implementation of air-coal combustion, we mitigate flame-related damage to refractory materials, resulting in prolonged equipment lifespan and reduced maintenance costs.