What are the common malfunctions and troubleshooting methods of small biomass pellet mills?

 

 

 

Low pellet formation rate is the most common fault in small wood pellet machines. The main causes include unsuitable raw material moisture content, excessive gap between the pressure rollers and the die, and insufficient pressing temperature. If the raw material moisture content is too high (above 18%), the pellets will easily crumble and fail to form properly; a dryer is needed to reduce the moisture content to 10%-15%. If the moisture content is too low (below 10%), the raw material will lack viscosity; a small amount of water can be sprayed before feeding to adjust the moisture content. The normal gap between the pressure rollers and the die should be 0.1-0.3 mm. If the gap is too large, it needs to be reduced using adjusting bolts. If the pressure rollers are severely worn, they need to be replaced. Insufficient pressing temperature will lead to incomplete lignin softening. The heating temperature can be increased through the control system; generally, feed production is controlled at 60-80℃, and energy pellets at 80-100℃. A feed mill once experienced a sharp drop in pellet formation rate due to decreased heating efficiency caused by low winter temperatures; the problem was quickly resolved by adding an insulation layer and increasing the heating power.

 

Material blockage in biomass wood pleating machines often occurs at the feed inlet and pressing chamber, primarily caused by uneven particle size of the raw materials, excessive feeding speed, or the presence of hard objects in the raw materials. If the feed inlet is blocked, the machine must be stopped immediately. Clean any residual material from the feed inlet and check if the pulverizer is functioning properly, ensuring the raw material particle size is within the 2-5mm range. If the pressing chamber is blocked, disassemble the pressing chamber casing, clean out any clumps of material, and check for jamming of the pressure rollers. If hard objects are stuck between the pressure rollers and the die, remove them promptly and check for damage. To avoid blockage, feeding should be uniform, avoiding sudden increases in feed rate. During the raw material pretreatment stage, screening equipment should be used to remove stones, metal, and other hard objects.

 

Excessive noise or severe vibration during the operation of a small biomass wood pleating machine is usually caused by loose, unbalanced, or worn components. First, check if the anchor bolts are loose. If so, tighten them with a wrench. Second, check the balance of the pressure roller and motor. Uneven wear on the pressure roller will cause operational imbalance, so the severely worn pressure roller needs to be replaced. Finally, check the reducer and bearings. If the bearings are lacking lubrication or worn, abnormal noise will occur, requiring the addition of lubricating oil or replacement of the bearings. A processing plant experienced severe vibration in its equipment. After investigation, it was found that one side of the pressure roller was severely worn. Replacing the pressure roller completely resolved the vibration problem, and the equipment returned to stable operation.

 

Overheating of the biomass wood pellet mill motor can be caused by overload, poor heat dissipation, or electrical problems. Overload is often due to excessive feed rate or mold blockage; the feed rate needs to be reduced and the mold cleaned. If the motor cooling fan is damaged or the ventilation holes are blocked, the fan needs to be replaced or the ventilation holes cleaned. Electrical problems, such as unstable voltage or loose wiring, require contacting an electrician to check the circuit and ensure stable voltage and secure wiring. In addition, insufficient lubrication of the motor bearings can also cause overheating; regular lubrication is necessary.

 

Cracks or rough surfaces in the pellets are mainly related to pressing pressure and uneven mixing of raw materials. If the pressing pressure is insufficient, the pressure parameters should be increased appropriately. If pressure adjustment is ineffective, it may be due to a leak in the hydraulic system, requiring inspection and repair of the hydraulic lines. Uneven mixing of raw materials can lead to insufficient viscosity in some particles; the mixing system needs to be checked to ensure that additives or binders are evenly incorporated into the raw materials. Troubleshooting should follow the principle of "starting with the easy and then moving to the difficult," first checking the raw material pretreatment and parameter settings, then checking for problems with equipment components. Meanwhile, regular equipment maintenance can effectively reduce the occurrence of malfunctions. It is recommended to establish an equipment maintenance log to record each malfunction and its handling, summarizing patterns for proactive prevention.

 

 

 

 

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1.What is the price of equipment for a Industrial wood pellet machine?

It costs approximately US$1,900.00 - 28,600.00

 

2. If equipments have some quality problem, how would you deal with?
We will responsible for all the quality problems. Change all the parts for free.

 

3. What services can we provide?
We have professional overseas installers responsible for installation, commissioning, and free training. Professional personnel are waiting for you online 24 hours a day.

 

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