What is the cause of the unstable current of the biomass pellet machine?

Listen to the engineer's detailed analysis for you: the ring die and pressure roller of the biomass granulator rotate at a constant speed, and the working state of each instant is basically the same. If the amount of material fed is unchanged, the energy consumption should also be relatively stable, and the current is relatively stable when reflected on the motor.

When the biomass granulator is working, as long as the material thickness in the feeding area is less than the maximum starting point of the compaction area, it will directly affect the effective working interval length of the compaction area and the extrusion area, and cause the fluctuation of current and the change of time-to-time output. If the material layer thickness in the feeding area is greater than the maximum starting point of the compaction area, the thickness of the material layer in the feeding area will be increased, it will not have any impact on the hourly yield and energy consumption per unit of time, and will no longer cause changes in current and hourly yield. Because the thickness of the material layer in the feeding area exceeds the maximum starting point of the compaction area, the interval of the compaction area and the extrusion area is constant and will not change. The nip angle between the zones where the more fed materials are located is greater than the critical friction angle, and the materials will not be caught in the compaction zone. In this way, with the increase of the feeding amount, the balance between the in and out will be broken, and the feed layer in the feeding zone will accumulate thicker and thicker until all the gaps are filled and blocked to the feed inlet, making the biomass granulator unable to work normally. At this time the current will increase.

In the actual work of the biomass pellet machine, with the change of the feed amount, the instantaneous output and the main motor current change accordingly. And when the feeding thickness does not exceed the maximum starting point of the compaction zone, the phenomenon of more and more material layers in the feeding zone will not be caused by the increase of the amount of powder we feed. As mentioned earlier, the area that can cause instantaneous output and energy consumption changes should be the two areas of work and material layer-the compaction area and the extrusion area, so we believe that the third area mentioned above-the reasonable existence of the feeding area is subject to certain conditions. That is to say, the fed material layer is distributed in the pressing area, the extrusion area and the feeding area where the total thickness does not exceed the maximum starting point of the pressing area. The sawdust granulator will work normally under the allowable power. Once the feeding amount is too large and exceeds the thickness of the maximum starting point of the pressing area, the material layer will accumulate and gradually increase, and the granulator will not work normally. The current is fluctuating.

Through the above analysis, we will discuss some of the phenomena shown by the biomass pellet machine under the two working conditions that may occur at work:

1., when the power of the main motor is not large enough compared with the corresponding granulation parameters, our feeding thickness is adjusted between the end point of the extrusion zone and the maximum entry point of the compaction zone (this point will change correspondingly with the comprehensive changes of different raw materials, compression ratio, effective aspect ratio, humidity, pressure roller and other variable factors). Generally, it will not exceed the maximum entry point. With the increase of the feeding amount, the interval length of the compaction zone will be shortened, and the interval length of the extrusion zone will gradually increase accordingly, and the main motor current will gradually increase until the maximum allowable use. If the current reaches the protection value we set and the feeding thickness does not exceed the thickness of the maximum starting point in the compaction area, if the feeding amount is increased again, the safety system will act and discharge excess powder to ensure the normal operation of biomass particles.

It is 2. assumed that the motor is not overloaded after the main motor power is high or the feeding thickness exceeds the thickness of the maximum starting point in the compaction area due to the combined changes of many variables. At this time, the powder fed by more people cannot increase the current output and will not cause the current of the main motor to increase. Instead, the powder pile accumulated in the machine can only be continuously increased until the inner cavity of the granulator is blocked and the granulator cannot work normally. Of course, this special phenomenon occurs less in actual production (if the raw material moisture is too large, the effective aspect ratio is too small, the pressure roller is seriously worn and the gap is not adjusted, the raw material is replaced, etc., this phenomenon may occur), which is a working condition that we do not want to occur. In-depth analysis of the first commonly used working state, it is not difficult for us to know that under the premise that the relevant conditions are unchanged, with the change of the feeding amount, the interval length of the pressing zone and the extrusion zone also make corresponding changes within a certain range (the feeding flow decreases, the interval length of the extrusion zone decreases, and the interval length of the pressing zone extends, on the contrary, the extrusion zone extends, the pressing zone shortens), when the feeding amount does not exceed the thickness of the maximum starting point of the compaction zone, the length between the two zones above this writing is not a constant value. The larger the value of the squeeze zone length, the higher the production efficiency, and the longer the length of the pellets extruded per time per press roll.

From this, it is concluded that the factors of current instability under the condition of controlling the feed amount need to be investigated from the reasons such as the moisture content of the raw material, the effective aspect ratio is too small, the pressure roller is seriously worn and the gap is not adjusted properly, and the raw material is replaced.