Calculation method for carbon content
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This post was last edited by lianyouren on 2011-7-1 12:11. How is the water-to-carbon ratio calculated for hydrogen production from coking dry gas, whose composition is 3% H2, 4.8% air, 2% methane, 1.8% ethane, 1% propane, 0.2% butane, and 5% olefins? Volume: 5,000 cubic meters, steam: 9 tons
This post was last edited by chenlin_g on 2011-7-1 18:07. The composition is H23%, air 4.8%, methane 2%, ethane 1.8%, propane 1%, butane 0.2%, and olefins 5%. How does one calculate the water-to-carbon ratio? The gas capacity is 5,000 cubic meters, and the steam output is 9 tons. Brother, the sum of your values doesn’t equal 100%. Basic calculation formula: H2O/C = vapor flow rate (Nm3/h) / carbon flow rate (Nm3/h). Vapor flow rate (Nm3/h) = vapor mass flow rate (Kg/h) / 18 * 22.4. Carbon flow rate (Nm3/h) = volume flow rate of carbon * average number of carbon atoms. Average number of carbon atoms = ∑ (volume of each component * carbon content in that component); here, ∑ denotes summation, and the carbon content for C1 is 1 and for C2 it is 2. . ) I assume myself that hydrogen makes up 20%, methane 60%, ethane 10%, and propane 10% (it should be noted that the carbon in CO2 cannot be included in this calculation). As for CO, it should not be present in the composition; if it is, one must handle it accordingly. P) The average number of carbon atoms: ∑n = 60%*1 + 10%*2 + 10%*3 = 1.1. Carbon flow rate (Nm3/h) = Volume flow rate * Average number of carbon atoms = 5000*1.1 = 5500 Nm3/h. Steam flow rate (Nm3/h) = Steam mass flow rate (Kg/h) / 18 * 22.4 = 9000/18*22.4 = 11200 Nm3/h. H2O/C = Steam flow rate (Nm3/h) / Carbon flow rate (Nm3/h) = 11200/5500 = 2.04. Complete calculation methods can be found in many references.