How are the catalytic charring amount and the heat input/output of the unit calculated?
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As the title suggests, I would like to use the real-time online data from the device to automatically calculate the daily amount of catalytic coking as well as the heat input and output. How can this be achieved? Please ask an expert to list the parameters required and the specific calculation formulas. Thank you so much!
The last edit to this post was made by the Petrochemical Engineer on 2016-10-28 at 12:22. The formula for catalytic coking as described in the book \"Calculations and Technical Analysis in Catalytic Cracking Processes\" is as follows: K=V1*(3.78+0.242*CO2+0.313*CO-0.18*O2)/(100-CO2-CO-O2). Here, CO2, CO, O2, and N2 represent the composition of the dry flue gas, expressed in % (by volume)； K coke volume, kg/h ； V1: dry air volume, m3n/h; Is it possible for me to perform a simple online calculation of the amount of burning?
Furthermore, this is calculated automatically; it shows whether your on-line analyzer is accurate or not. Anyway, not many of them are accurate. The parameter trends can be viewed, but there are differences between the data obtained and those from manual sampling and analysis of the flue gas, so the amount of charring differs significantly from the actual value.
This post was last edited by Petrochemical Engineer on 2016-10-28 at 12:33. We have a system for manually sampling and analyzing flue gas, and I can retrieve data directly from that system. Our facility keeps an analysis record of the flue gas at 8 o’clock every day; according to these records, the carbon dioxide level is around 13%, carbon monoxide is 0, oxygen is 6%-7%, and the remaining component can be considered nitrogen.
How is the dry air volume V1 corrected?
The main air volume requires temperature and pressure compensation; if the instrument itself has already performed this compensation, no adjustment is needed during calculation. As for the dry air volume correction I mentioned, you need to check the relative humidity (relative humidity is related to the dry-bulb temperature; refer to Page 151 of the Calculation and Technical Specifications for catalytic cracking processes). The correction formula is: main air flow divided by (1 + relative humidity). This is provided for reference only.