You can apply a wood pellet burner in drying, cooking, heating, or other fields. However, you have to match it with hot-blast stoves, furnaces, or boilers. For your information, a well-designed pellet burner can increase the burning efficiency of wood pellets up to more than 86%. Because wood pellets have uniform density & size, they can realize automatic feeding & continuous burning.
Wood Pellet Burner Classifications
Based on the feeding method, we can classify a pellet burner into three types. The first is the upper type pellet burner. It is the most widely-used options in boilers & stoves. Mostly, it comes with blanking channel on the inner wall, where the pellet fuel passes through & gets into the combustion chamber. Then, the main air & the warm air needed for automatic ignition come in through the combustion chamber’s bottom. And, the secondary air comes in through the holes on the combustion chamber’s wall. Usually, this type features a blower to provide combustion air & promote heat exchange between the stoves & surrounding air. For ash removing, it offers a manual or automatic grate.
Bottom feed type pellet burner is the second classification. You can use it to burn wood chips. Gradually, it becomes usable for wood pellet fuel. Here, the pellet fuel goes to the combustion bed through the pipe at the bottom of the burner. Then, the main air gets into the combustion chamber through the holes on the combustion bed or the feeding device. While the secondary air gets into the combustion chamber through the holes you can find above the combustion bed. For your information, this type of wood pellet burner needs no separate dust collector.
Another one is the horizon feed type pellet burner. Its working principle is similar to the bottom type feed type. However, the combustion bed has a different shape. In addition, it requires an additional dust collector.
Feed Conveyor in the Wood Pellet Buring System
Commonly, the combustion burner separates with the stock bin. Between them, there must be a feed system serving to feed the pellet fuel to the combustion chamber. You need to know that the heat demand determines the feeding speed.
Spiral conveyor belongs to one of the most common feeding methods. In addition to a simple structure, it also has a compact design and small volume. You can easily operate and manage it, with high safety & good sealing. This is ideal for short-distance conveying. Even though it costs low, the power consumption is high. You have to know that it is sensitive to minerals, metals, or other impurities.
The second one is the airflow conveying system. This is more suitable if the burner has large distance with the stock bin. It can realize long-distance & continuous conveying of small wood pellets & small-size block materials. It can even realize horizontal & inclined conveying. Last but not least, it offers easy installation & maintenance. However, the price is high, the exhaust noise is relatively high, and the transmission speed is not constant & uniform.
Conclusion
Today, a wood pellet burner is very popular and many people apply it in biomass power generation, biomass boiler, and heat supply. A well-designed burner can save labor work, reduce sag & pollutant emission, and increase the heating efficiency. So, with the increasing biomass energy application, it offers higher requirements on the wood pellet burning tech.
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