Investigation on internal structure of pellets with halloysite additive and effect of moisture content before the pelletizing process

Joanna Wnorowska,Mateusz Tymoszuk,Sylwester Kalisz

doi:10.1051/e3sconf/20198201015

Joanna Wnorowska, Mateusz Tymoszuk + Show 1 more

Open Access

https://doi.org/10.1051/e3sconf/20198201015

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Abstract

The article presents analysis of the particle size distribution inside pellets and the influence of moisture content before pelletization process on final product mechanical strength. The following types of biomass were used without and with the content of additive (halloysite): Polish wheat straw – (SP-K), miscanthus (DM), cereal straw (DS) and herbaceous pellets (BZ). Particles inside pellets were characterized by a grain size smaller than 3 mm and the cumulative weight percent passing through the sieve with mesh screen 1 mm for each sample was higher than 70 %. The moisture content before pelletization process for tested materials was in the range of 25% - 30% depending on the material which was used, while values of mechanical strength of pellets were within the range of 77.7% - 96.2% (depending on the type of material and moisture content before the pelletization process).

Highlights

Restrictions related to biomass combustion, such as different elemental composition, a relatively high chlorine content, as well as a different chemical composition of ash compared to fossil fuels resulting in hazards for the boiler and its auxiliary installations [1], contribute to the creation of new technological solutions in the energy sector. An example of this is the development of biomass pre-treatment processes before its energy use. One of these processes is the palletization of biomass enabling for application of fuel additives
During pelletization the raw material is subjected to a series of processes, among which one can distinguish: grinding, conditioning, granulation and cooling
Each of these stages has a significant impact on the final effect of the pelletization process

Summary

Introduction

Restrictions related to biomass combustion, such as different elemental composition, a relatively high chlorine content, as well as a different chemical composition of ash compared to fossil fuels resulting in hazards for the boiler and its auxiliary installations [1], contribute to the creation of new technological solutions in the energy sector An example of this is the development of biomass pre-treatment processes before its energy use. During pelletization the raw material is subjected to a series of processes, among which one can distinguish: grinding, conditioning (application of heat and/or moisture, use of fuel additives), granulation and cooling Each of these stages has a significant impact on the final effect of the pelletization process. The following types of biomass were used without and with the content of fuel additive (halloysite): Polish wheat straw – (SP-K), miscanthus (DM), cereal straw (DS) and herbaceous pellets (BZ)

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