Calculation of catalytic charring
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This post was last edited by Final Fantasy on 2010-7-16 at 12:13. A humble question: for calculating catalytic charring, apart from the data from smoke analysis regarding CO, CO2, and O2, and aside from using specific formulas, are there any other methods? Does the air volume need to be corrected? How to correct it?
The amount of charring can also be calculated through material balance.
Is it by material balance, that is, by deducing the amount of charring? If we calculate it properly, knowing this formula: Amount of char formed = Dry air volume * (3.78 + 0.242*CO2 + 0.313*CO – 0.18*O2) / (100 – CO2 – CO – O2) / 1000. Dry air volume = (Main air flow + Unpurified air flow) / (1 + Air molecular humidity). Are there any other methods for calculation besides this formula? Thank you!
Apart from main wind correction flow and humidity deduction, using flue gas for coking is the foundation of all calculations and the most standard method.
Actually, we are still at the stage of using formula calculations; but if the flue gas analysis is incorrect, is there a way to determine exactly how much has burned by using heat balance methods? ? ?
http://bbs.hcbbs.com/viewthread.php?tid=486401&highlight= I recommend a software that’s quite useful!
What is the sulfur content in coke? How is the concentration of SO2 in the flue gases from coke burning calculated?
To briefly explain the calculation process: Main air flow (calibrated by instruments) + air humidity (measured on-site) = amount of dry air; from this, the amounts of oxygen and nitrogen can be determined. If desired, other types of air that enter the regenerator can also be taken into account (such as loosening air and backflow air). Assuming that the amount of nitrogen in the main air is the same as that in the flue gas, and given the composition of the flue gas (dry flue gas, as all current analyses are based on dry flue gas), an equilibrium can be established to determine the amount of dry flue gas. Flue gas composition + dry flue gas volume = amount of carbon dioxide + amount of carbon monoxide; by using this, the total amount of carbon burned can be calculated. Flue gas composition + dry flue gas volume = excess oxygen amount. Oxygen content in the main air – excess oxygen amount – oxygen used to produce carbon dioxide – oxygen used to produce carbon monoxide = oxygen used for hydrogen combustion = amount of hydrogen burned. At this point, the total amount of material that burns = carbon amount + hydrogen amount. The hydrogen-to-carbon ratio should be within a reasonable range. The principle is simple, but the process is complicated; it’s better to use a formula. Just make sure to check that the hydrocarbon ratio is reasonable; if it isn’t, it’s likely that the data regarding the flue gas composition are incorrect, and this is related to both the sampling process and the analysis process.
Reply to 8#: When a barber trains an apprentice, the unit for main air flow is generally NM3/min, right? No calibration is needed. Also, are the data obtained from online flue gas composition analysis for dry flue gas or wet flue gas? Every time the samples are sent to the laboratory for analysis, the results seem incorrect (CO + CO2 + O2 should not exceed 15, whereas the online readings are around 18). Please explain it clearly.
Reply to 9# zzh030972: It is the composition of dry flue gas, as it contains only CO2, CO, N2, and O2, with no H2O.
Think about it: if the value of CO + CO2 + O2 is too low, it necessarily means there is an excess of oxygen available for burning hydrogen, which in turn indicates a high hydrogen content in the coke. If the calculated hydrogen content is too high, then it’s clearly incorrect. Generally, the C:H weight ratio is 94:6–92:8.