Daily maintenance of biomass pellet mills is essential. Proper maintenance improves equipment performance, increases output, reduces wear on parts, and extends the equipment's lifespan. This article details the daily maintenance of biomass pellet mills.
1. Feeder Maintenance: Check the transmission mechanism and feeder screw bearings weekly, adding appropriate amounts of lubricating oil to the roller chain and bearings. Lubricate the ends of the feeder bushings daily.
2. Conditioner Inspection and Cleaning: Inspect and clean the mixer shaft. Grease the bearings at all ends of the mixer once a month.
3. Feed Chute Cleaning: Before the biomass pellet raw material passes through a flow screen, the chute must be kept clean and free of indentations to ensure efficient delivery of material from the conditioner mixer to the pelleting chamber. If magnets are placed there, remove any accumulated metal before and after each startup. 4. Guide Plate Cleaning: The guide plate's function is to maintain a clean surface on the conical funnel, ensuring even material distribution to the pelleting chamber and preventing agglomeration of material from flowing into the pelleting chamber.
5. Main Shaft and Transmission Assembly: Depending on the model of the biomass pellet mill, most models operate with all transmission devices immersed in lubricating oil, requiring only two oilings per year. For some models, the main shaft bearings require lubrication every 8 hours of operation.
Maintenance of biomass pellet mills differs from routine maintenance. Poor maintenance can easily lead to premature aging; therefore, proper maintenance of biomass pellet mills is essential.
Biomass pellet mills are highly compatible with raw materials, especially agricultural straw, such as rice husks, wheat, peanut, corn, and other crop straws. However, raw materials cannot generally be directly fed into the machine for processing because collected straw typically contains high moisture content, resulting in a high-moisture finished product that is difficult to burn. Customers can choose to air-dry the material before feeding it into the pellet mill, or use a drying machine to dry the material to a moisture content of 13-15%.
To produce high-quality pellets, we need to meet high requirements not only for the pellet mill itself but also for the raw materials used. As we know from the types of equipment, there are many types of raw materials that can be processed. So, what are the detailed requirements?
1. Different raw materials have different moisture requirements. Generally, pellet mills require that the moisture content of the raw materials not exceed 15%.
2. The maximum size of the raw material for pellet milling must not exceed the die diameter.
3. Hard objects such as iron blocks and stones must not be mixed into the raw materials, otherwise, the equipment will be damaged.
4. High-quality pelleting can be achieved without any additives. However, to increase output and significantly extend the service life of easily worn parts such as the die and pressure rollers, it is recommended to use adhesives appropriately.
5. Try to use softer wood chips to make pellets. Softer wood chips are easier to compress, effectively improving the forming rate.
6. The moisture content of the raw material for pressing wood pellets should be between 13% and 15%. If the moisture content is too high, the pellets will be loose and easily break during packaging and transportation. If the moisture content is too low, the pellets will be difficult to press, resulting in a low pellet formation rate and excessive powdery material.
The above are the requirements for raw materials for pellet mills, mainly focusing on three aspects: moisture content, size, and hardness. However, this equipment needs to process many types of raw materials, such as common wood chips, feed, and crop straw. Their performance in these three aspects varies, requiring further detailed understanding of their standards.
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