EFFECT OF SHOCK HEATING ON THE STRENGTH AND STRUCTURE OF COKE PRODUCED BY HIGH-PRESSURE CARBONIZATION OF LOW-RANK BITUMINOUS COALS

In the BGL slagging gasifier, graded coal is gasified in a fixed react or. A study has been made of the carbonization of large particles (sim ilar to 25-30 mm) of three high-volatile UK bituminous coals at pressu res in the range 0.5-8 MPa in an autoclave using a shock beating techn ique. The cokes were characterized in detail and compared with the cor responding high-pressure cokes produced under slow heating conditions. The coke yields increased significantly with increase in carbonizatio n pressure. On the other hand, cokes produced under shock heating cond itions resulted in a lower yield than the corresponding cokes prepared under slow heating conditions. These shock-heated cokes gave higher r elative apparent densities and exhibited greater strength, such as hig her abrasion resistance. (C) 1997 Elsevier Science Ltd.