Techniques and Equipment for Upgrading of Heat-treated Crushed Brown Coal For Energy Production and Utilities

Valery A. Moiseev, Vladimir G. Andrienko, Vladimir G. Piletskii, Valery A. Donchenko and Anatoliy I. Urvantsev

3rd Proezd Marjinoy Roshchi, 40, Moscow 127018, Russia, CJSC COMPOMASH-TEK

DOI : http://dx.doi.org/10.13005/bbra/2246

ABSTRACT: The article deals with the problems of increasing the efficiency of electric separators through developing new approaches to their design for upgrading of heattreated crushed brown coal. The rational use of natural resources and efficient energy consumption are two basic requirements of EU Directive 2008/1/ÅC. It is expected that the techniques for brown coal pre-drying will result in increased energy efficiency of enterprises of up to 5% and upgrading of heat-treated brown coal will increase energy efficiency by the same value. To upgrade heat-treated brown coal it is necessary to design new equipment including high-efficiency electric separators. It was earlier found that the maximum value of coal particle charge was provided in a corona-electrostatic separator, a lower level of coal particle charge was observed in a triboelectrostatic separator and the lowest level of coal particle charge was established in a plate-type electrostatic separator. The basic efficiency constraint for drum-type corona-electrostatic separators is the diameter of a collecting electrode and one operating area. To select the directions for increasing the productivity and efficiency in separating heat-treated crushed brown coal in drum-type corona-electrostatic separators the results of studies of changes in force vectors affecting its charged particles, nature of their motion in the electric field resulting in separated products – organic and mineral components of brown coal, taking this into consideration the factors of the heating temperature, voltage across a corona-producing electrode (drum), diameter of a corona-producing electrode and its rotation speed, have been analyzed. The increased efficiency of a drum-type CES with a slight increase in its weight is associated with removing a constraint from design parameters – the diameter of a collecting electrode (drum). It is realized through the change of orientation of a collecting electrode from horizontal to vertical.

KEYWORDS: Heat-treated brown coal; upgrading; particle charge; A corona-electrostatic separator; efficiency; vertical corona-producing electrode (drum)

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