Shrinkage of the Charge in the Coking Process. Formation of the Granulometric Composition of Coke

摘要

On the basis of theoretical conceptions of the volumetric character of shrinkage and volumetric stressed state, a mathematical-statistical model is proposed for the formation of shaping cracks and of full-sized coke pieces, which is based on the following: the second theory of the strength of brittle bodies; the transition of the plane stressed state of the primary bearing plate of semicoke at the outset of the coking process to the volumetric (bulk) stressed state; the shrinkage of semicoke-coke is volumetric and the same along the axes of the coordinate system; in the plane parallel to the heating wall the shrinkage of the semicoke layers occurs in the direction of the axes of compression; as a result of the transverse shrinkage along the axes of compression, the coke cake pulls away from the chamber walls and an axial seam is formed; as a result of vertical shrinkage, horizontal shaping cracks are formed; as a result of the absence of longitudinal shrinkage, vertical cracks are formed; the full-sized coke pieces in the coke cake form a statistical assembly in which the distance between the axes of compression is a characteristic of the average transverse size of coke pieces.