Research Article
Gasification Coupled Chemical Looping Combustion of Coal: A Thermodynamic Process Design Study
Table 3
Comparison of net energy obtainable from direct combustion and gasification coupled CLC of coal.
| Case | C3 | C1 | C5 | B5 | B3 | B2 | C2 | B1 | C4 | B4 |
| HCCT (°C) | 650 | 500 | 700 | 750 | 700 | 650 | 600 | 600 | 650 | 700 | Air required (moles) | 3.76 | 3.76 | 3.76 | 3.76 | 3.76 | 3.76 | 3.76 | 3.76 | 3.76 | 3.76 | Preheating of coal (kJ) | 10.06 | 7.09 | 11.11 | 12.19 | 11.11 | 10.06 | 9.04 | 9.04 | 10.06 | 11.11 | Energy to heat air (kJ) | 90.20 | 67.69 | 97.80 | 105.45 | 97.80 | 90.20 | 82.65 | 82.65 | 90.25 | 97.80 | Reaction enthalpy from direct combustion (kJ) | −394.44 | −394.11 | −394.54 | −394.65 | −394.54 | −394.44 | −394.33 | −394.33 | −394.44 | −394.54 | Energy to cool N2 (kJ) | −69.95 | −52.60 | −75.81 | −81.71 | −75.81 | −69.95 | −64.13 | −64.13 | −69.95 | −75.81 | Energy to cool CO2 (kJ) | −29.56 | −21.78 | −32.22 | −34.91 | −32.22 | −29.56 | −26.93 | −26.93 | −29.56 | −32.22 | Net energy from direct combustion (kJ) | −393.68 | −393.71 | −393.66 | −393.63 | −393.66 | −393.68 | −393.69 | −393.69 | −393.68 | −393.66 | Net energy from gasification coupled CLC process (kJ) | −390.16 | −389.07 | −388.46 | −388.43 | −388.35 | −388.34 | −388.24 | −388.17 | −388.16 | −388.02 |
| Energy Difference(kJ) | 3.52 | 4.64 | 5.20 | 5.20 | 5.31 | 5.34 | 5.46 | 5.53 | 5.52 | 5.64 |
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