Methods of expressing coke reactivity
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1. A certain amount of coke sample is reacted with pure CO2 gas under specified conditions for a certain period of time; thereafter, it is cooled with nitrogen and weighed. The percentage of the difference in weight of the coke sample before and after the reaction, relative to the weight of the coke sample itself, is known as the Coke Reaction Index (CRI). 2. The block coking reaction rate can also be expressed as a percentage of the ratio of the CO concentration in the gas after the chemical reaction (corresponding to the carbon that has reacted) to the concentration of (CO + CO2). What is the specific calculation formula for the second way of representation?
Only the first one is a national standard; we used the first type to adjust the reactivity of other companies in the past. I’m not sure where the author got the second notation from – the earliest standards for reactivity were established by the people in my organization
These two representation methods are from <Coking Process>, a textbook planned for higher vocational education by the Ministry of Education, edited by Wang Xiaoqin. The second main method in the textbook gives the expression CRI = Q(CO) / ×100%. I think the way of expression is incorrect. The textbook states that Q(CO) and Q(CO2) represent the volume fractions of CO and CO2 gases in the gas mixture after the reaction.
For analysis and testing methods that follow standard specifications, it is best to carry out the calculations using the methods specified in those standards; otherwise, the results will not be recognized