Investigating on Mechanical Force and Thermal Stress on Coke Structure Evolution Based on Multi-Physical Fields

Coke structure can be divided into cracks, pores and coke matrix. In this work, a coke cross section model was established. Moreover, a rectangle and two ellipses with different sizes were also constructed to represent cracks and pores, respectively. The effects of mechanical force and thermal stress on cracks and pores were studied. The results showed that the coke matrix adjacent to the pores was relatively stable in comparison to the coke matrix adjacent to the crack. In addition, the continuous production and extension of cracks would result in the occurrence of a coke "perforation" phenomenon, causing the coke structure to be damaged and coke size and strength to be reduced due to mechanical force. Compared with the strong effects of mechanical force on coke, thermal stress will not cause the fracture phenomenon, but only change the shape. Moreover, it was also found that mechanical force destroys coke rapidly and greatly comparing thermal stress. This work revealed the evolution of coke under mechanical force and thermal stress and provides theoretical support for coal-blending coking.