부산대학교 도서관

In order to standardize the testing method for coke strength after reaction (CSR) which is used widely for evaluation of coke quality at high temperatures, studies have been carried out on a few points involved in the method. The findings are outlined as follows:1) Sample temperature greatly affects CSR values. Temperature control at three points (at the center of a sample, and at top and bottom of the oven-wall) is preferable.2) The volume of samples required for the first-stage lot is 10kg. The appropriate crushing of the lot is achieved by a jaw-crusher and grains of larger than 21mm are crushed furthermore.3) A 19-21mm fraction of the sample thus crushed will closely represent the whole sample.4) The CSR testing method is accurate to the extent that standard deviations of CRI and CSR are 0.79 and 1.10 respectively.5) Reaction temperature, reaction time and CO2 volume, have affects on CSR values by 2-3%/10°C, 0.3%/min. and 0.1-0.2%10.1l, respectively.