Mandø, M.

Nielsen, S. K.

Rosenørn, A. B.

This paper presents a model for simulating the physical processes occurring in wood pellet die. A 1D model of a press channel has been set up, which is capable of simulating the e.ect of di.erent press channel designs. The energy consumed in the press channel is divided into two contributions; compression and friction, from where the total energy consumption is evaluated together with the .nal density of the pellet. The model is validated by experimental single pelleting tests, where soft wood pellets were produced in four single dies with di.erent inlet designs. The simulated pellet density is determined via a pressure dependent density function of the pelleting material, developed from experimental compression tests. The simulations show that the pellet compression mainly occurs in the inlet part of the die, and friction is the major contributor to the energy consumption. The locations with high pressure in the simulations correlate well to observations of wear on full scale dies. The presented work can contribute to knowledge about the pelleting behavior of existing and new materials and development of energy e.cient dies with extended durability

1D model for investigation of energy consumption and wear in die designs used for biomass pelleting

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