Technical Activities of Research and Design Institutes in the Coal-Mining Industry

摘要

Bulgaria's coal reserves are very limited. Moreover, they are concentrated in deposits where natural and technical coal-getting conditions are complex: irregular bedding, unfavorable physical and mechanical winning conditions, poor physical and mechanical properties of the coal and enclosing rock, considerable gassiness and water intrusion, liability to spontaneous combustion, heavy faulting, coal with a high ash content and of low calorific value, high content of harmful inclusions, etc. Complex bedding and winning conditions make it difficult to work coal seams efficiently. Highly-efficient mechanized coal-setting devices for use in difficult mining conditions are not being developed anywhere in the world, and the use of existing equipment does not give the best results. For this reason, more efficient winning operations depend on the solution of a large variety of complex problems which are being referred to the research and development departments of MNIPKI ''Minproekt.'' The main areas in which research is being carried out are described briefly. (ERA citation 13:020920)