Shock Impulse Model when Compacting a Coal Load for Coke Production

Abstract

Currently, the reserves of coking coals necessary for the production of high-quality coke are significantly reduced. One of the promising technologies for the preparation of raw materials for the production of coke is the ramming of coal charge: by increasing its density, the requirements for the quality of the initial coals are reduced and it becomes possible to widely use, along with coking, and coal of the worst quality. Determination of the characteristics of the ramming technology and equipment is carried out mainly empirically, which does not guarantee the receipt of scientifically based effective technical solutions during their development. One of the key characteristics of the coal charge ramming process is the impact energy and the shock pulse parameters corresponding to it — they determine both the density of the coal charge and the dynamic effects on the load-bearing structures of the equipment. The latter, in turn, determines the operability of the equipment, expressed in terms of strength, stability and durability. Experimental analysis and development of a mathematical model of the shock pulse during ramming of coal charge are aimed at providing information for the design and calculation process, significantly reducing the level of uncertainty in the development of ramming equipment and technology. It is shown that the shock pulse is well approximated by a sine half-wave. For a hammer with certain geometric and mass characteristics, and the corresponding impact energy, the intervals of change in the duration and peak value of the impact pulse force, as well as the relationship between these characteristics, are determined. They are an information base for expert evaluation of the characteristics of the shock pulse when the coal charge ramming energy changes.