Investigation of the process of shredding coniferous sawdust in a crusher with a two-way material supply system

Abstract

Russia is one of the main countries in the extraction and processing of forest resources. Waste from wood processing is still one of the cheapest energy sources. Therefore Russia is actively developing and introducing technologies for processing waste from the forest industry. The technology for producing fuel pellets and briquettes is widespread. One of the operations of this technology is the preliminary grinding of the feedstock. Nowadays, traditional hammer mills are used for this, which are used in the feed industry. As a result of the analysis of the designs of such crushers, it was revealed that when grinding materials with a low specific gravity, their potential is not fully utilized. A hypothesis has been put forward that an increase in the productivity of hammer crushers when grinding materials with a low specific gravity is possible due to a change in the conditions for introducing raw materials. To test this hypothesis, a crusher with two feed necks and a vortex chamber was developed. Research has been carried out to study the influence of the conditions for entering the shredded material into the crushing chamber. The performance of the crusher is determined with three ways of feeding the shredded material.