Abstract
Considering the need for development and improvement of biomass processing equipment, researchers bring contribution by making suggestions to design also through simulation and modelling of different stresses that occur on equipment’s working tools. In this paper the stress in hammer mill working tools was analysed using FEM simulation with the help of SolidWorks 2016 Premium, projecting the geometric model and FEM simulation for a MC 22 hammer mill. The hammer mill has a four bolts rotor on which are the hammer disposed. The hammer mills rotor frequency is about 2940 rot/min. An important result in FEM simulation was the fact that the maximum reaction in the hammer joint was 11635 N. After FEM simulation experimental research were done using shredded miscanthus and energetic willow, the mill being equipped alternately with 4 types of hammers, with corners processed differently.
Highlights
According to data provided by Eurostat, renewable energy produced from biomass represents about 60%
Working organ geometry was realized with the help of SolidWorks software and is presented in figure 1 a
We can express the following conclusions: - Through finite element simulation of the hammer mill working process, a maximum deformation of 0.036 mm at the tip of the hammers due to centrifugal force during functioning was concluded; - Tensions were half the limit of elasticity, and the equivalent unitary effort is manifested on the contact surface of the hammer with the shaft or with the joint. - Maximum reaction for hammer joint was of 11635 N;
Summary
According to data provided by Eurostat, renewable energy produced from biomass represents about 60%. In 2016 the total amount of biomass used for bioenergy was 140Mtoe, 96% of which was obtained in the European Union and the other 4% was imported outside EU [1]. Considering this fact scientists are continuously researching for the optimum process to transform biomass in bioenergy. Considering that the size reduction process is very high energy consumer for biomass processing, scientists tried to determine the optimal size reduction level. They used miscanthus and switchgrass as raw material and applied a combination of modelling and experimental tests. Their conclusions expressed the fact that cost would not increase if the grinded particle size is in the range of 4 to 6 mm. [3]
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