| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.8 ( September 1983 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Investigation of Strength Difference between Dry Quenched and Wet Quenched Coke Tsugio Miyagawa, Shunji Ito |
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Synopsis : This paper discusses strength difference between dry quenched (DQ) and wet quenched (WQ) coke in terms of breakage behavior by regarding coke as one of brittle materials. DQ and WQ coke, produced under the same conditions except for the quenching process, were used in the following experiments: (1)the revolving drum test to measure strength difference between size groups, (2)the static loading test with disc-shaped specimens to evaluate structural microdefects such as microfissures, and (3)the compressive fracture strength test on irregular-shaped lump coke to estimate macrofissures. Except for large open fissures not assessed in these experiments, there is practically no difference between the two types of coke in the quality and the distribution of relatively large Griffith-type cracks, which control the breakage of lump coke in the static loading test. Once the cokes are subjected to impact forces, however, a difference in strength occurs between them. This implies a propagation of macrocracks originated from microdefects by the impact; therefore, WQ coke having many structural microdefects seems to be considerably affected in its breakage strength. It is concluded that the strength improvement by coke dry quenching process is mainly attributable to the fact that the DQ coke has few structural microdefects in coke. |
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