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Table 3 Kinetic constants for pyrolysis and gasification at different heating rates

From: Co-thermal degradation characteristics of rice straw and sewage sludge

Items Pyrolysis (N2 atmosphere) Gasification (air atmosphere)
Temp range (°C) Thermal decomposition rate R2 Temp range (°C) Thermal decomposition rate R2
Heating rate 5 °C min− 1
 SS 147–522 k = 7.77 × 104 e47.78/RT(X)2.62 0.91 137–529 k = 1.54 × 105 e61.01/RT(X)3.79 0.84
 20RS:80SS 153–521 k = 5.82 × 104 e49.08/RT(X)1.75 0.88 145–568 k = 0.82 × 105 e59.45/RT(X)2.47 0.80
 40RS:60SS 148–513 k = 2.56 × 104 e48.62/RT(X)0.84 0.84 151–521 k = 1.11 × 107 e78.76/RT(X)4.21 0.86
 50RS:50SS 148–521 k = 5.75 × 104 e52.51/RT(X)0.74 0.84 163–519 k = 1.39 × 106 e69.74/RT(X)2.71 0.79
 RS 151–522 k = 8.56 × 106  e72.65/RT(X)1.35 0.87 179–503 k = 5.87 × 107 e87.15/RT(X)2.0 0.74
Heating rate 10 °C min− 1
 SS 153–517 k = 1.37 × 105 e49.10/RT(X)2.41 0.90 148–550 k = 1.97 × 105 e60.12/RT(X)3.57 0.84
 20RS:80SS 173–535 k = 0.71 × 105 e48.62/RT(X)1.52 0.86 154–659 k = 5.40 × 105 e63.73/RT(X)3.30 0.81
 40RS:60SS 154–515 k = 0.84 × 105 e50.61/RT(X)0.9 0.84 160–551 k = 14.4 × 105 e64.31/RT(X)2.45 0.78
 50RS:50SS 147–516 k = 1.44 × 105 e53.07/RT(X)0.69 0.83 160–551 k = 19.1 × 105 e68.66/RT(X)2.26 0.80
 RS 178–500 k = 18.6 × 106  e75.40/RT(X)1.43 0.82 166–534 k = 0.59 × 108 e89.56/RT(X)2.12 0.71
Heating rate 20 °C min− 1
 SS 158–560 k = 3.47 × 105 e50.47/RT(X)2.32 0.91 153–532 k = 8.77 × 105 e64.65/RT(X)3.39 0.84
 20RS:80SS 156–531 k = 1.67 × 105 e51.20/RT(X)1.51 0.90 168–615 k = 5.38 × 105 e63.36/RT(X)2.64 0.80
 40RS:60SS 157–550 k = 0.84 × 105 e50.61/RT(X)0.90 0.84 177–550 k = 1.09 × 107 e75.28/RT(X)3.35 0.80
 50RS:50SS 152–560 k = 1.58 × 105 e55.1032/RT(X)1.0 0.80 175–573 k = 8.91 × 106 e73.86/RT(X)2.82 0.80
 RS 150–548 k = 3.82 × 107 e74.01/RT(X)0.84 0.80 190–515 k = 1.62 × 108 e88.09/RT(X)1.90 0.70
  1. R2 in a multiple regression model