What is the cause of the unstable current of the biomass pellet machine?
And listen to the engineer for your detailed analysis: the biomass pellet machine ring die and the pressure roller are rotating at a constant speed, and each instantaneous working state is basically equal. If the amount of material fed is constant, the energy consumption should be relatively stable. , the reaction to the motor, the current is relatively stable.
When the biomass pellet machine is working, we adjust the feeding amount as long as the material thickness in the feeding zone is less than the maximum starting point of the pressing zone, which will directly affect the effective working interval length of the pressing zone and the pressing zone, and cause current. Fluctuation and change in production, and if the thickness of the feed zone is greater than the maximum starting point of the compaction zone, then in addition to increasing the thickness of the zone within the feed zone, there will be no time production and energy consumption per unit time. Any effect will not cause changes in current and current production. Since the thickness of the material layer in the feed zone exceeds the maximum starting point of the compaction zone, the interval between the compression zone and the compression zone is constant and there is no change. When the feed angle of the multi-feed material is larger than the critical friction angle, the material will not be broken into the compaction zone, so that the feed-in balance is broken as the feed amount is increased, and the feed-through zone is larger than the feed zone. It will accumulate thicker until it fills all the gaps and blocks the feed port, making the biomass pellet machine unable to work properly. At this time, the current will increase.
In the actual work of the biomass pellet machine, the instantaneous output and the main motor current change accordingly as the feed amount is adjusted. Moreover, when the feeding thickness does not exceed the maximum starting point of the pressing zone, the phenomenon that the material layer in the feeding zone is more piled up due to the increase in the amount of the powder fed by us. As has been said before, the area that can cause changes in instantaneous production and energy consumption should be two areas of work and material – the compaction zone and the compression zone, so we think the third zone mentioned above – - There are certain conditions for the reasonable existence of the supply area. That is to say, the fed material layer is distributed in the pressing zone, the pressing zone and the feeding zone where the total thickness does not exceed the maximum starting point of the pressing zone, and the wood chip machine will work normally under the allowed power, once fed. If the amount is too large and exceeds the thickness of the largest starting point in the pressing zone, the layer will accumulate and gradually increase, and the pellet machine will not work properly. The current is fluctuating.
Through the above analysis, let us discuss some of the phenomena exhibited by the biomass pellet machine under the two working conditions that may occur during work:
1. When the main motor power is not large enough compared with the corresponding granulation parameters, our feed thickness is the maximum starting point at the end of the extrusion zone and the compression zone (this will vary with the raw material, compression) The adjustment between the specific changes in the ratio of the effective length to diameter ratio, humidity, pressure roller, etc., generally does not exceed the maximum starting point. As the feeding amount increases, the pressing area The length of the section will be shortened, and the length of the section of the squeezing zone will gradually increase, and the main motor current will gradually increase until the maximum value allowed. If the current reaches the protection value we set, and the feed thickness has not exceeded the thickness of the maximum starting point in the pressing area, if the feeding amount is increased, the safety system will act and the excess powder will be discharged. To ensure that the biomass pellets function properly.
Second, assuming that the main motor power is large or due to a combination of many variable factors, the thickness of the feed exceeds the thickness of the largest starting point in the compaction zone and the motor fails to overload. At this time, the powder that feeds more people can't increase the output, and it will not cause the increase of the main motor current. Instead, it can only increase the pile of powder accumulated in the machine until it is filled with the cavity of the particle machine. Causes the granulator to not work properly. 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, and the raw materials are replaced, this phenomenon may occur), this is our Undesirable conditions. In-depth analysis of the first common working state, we can easily know that under the premise that the relevant conditions are unchanged, as the feeding amount changes, the length of the compression zone and the extrusion zone is within a certain range. Corresponding changes are also made (the feed flow is reduced, the length of the section of the extrusion zone is reduced, the length of the section of the compression zone is extended, and the extrusion zone is extended, the compression zone is shortened), and the feed amount is not exceeded. When writing the thickness of the largest starting point in the tight zone, the length of the above two sections is not a constant value. The larger the length of the extrusion zone, the higher the production efficiency, and the longer the length of the particles extruded per press roll.
Therefore, it is concluded that the current instability factor in the case of controlling the feed amount needs to be checked from the reasons of the raw material moisture size, the effective length to diameter ratio, the pressure roller wear is severe, the gap is not adjusted, and the raw materials are replaced.