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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