Biomass Chemical Engineering ›› 2019, Vol. 53 ›› Issue (4): 9-18.doi: 10.3969/j.issn.1673-5854.2019.04.002
• Research Report • Previous Articles Next Articles
Xu ZHANG1,2,Jiao SUN1,2,Ying FAN1,2,Yongquan CAO1,2,Wenyi CHEN1,2,*()
Received:
2018-03-05
Online:
2019-07-30
Published:
2019-08-05
Contact:
Wenyi CHEN
E-mail:cwy63@126.com
Supported by:
CLC Number:
Xu ZHANG,Jiao SUN,Ying FAN,Yongquan CAO,Wenyi CHEN. Pyrolysis Characteristics and Kinetic Analysis of Phragmites australis Stalk[J]. Biomass Chemical Engineering, 2019, 53(4): 9-18.
Table 1
Characteristic parameters of the third pyrolysis stage of Phragmites australis stalk"
升温速率(β)/ (℃·min-1) heating rate | 热解初始温度(Ti)/℃ initial temperature of pyrolysis | 热解最终温度(Tf)/℃ final temperature of pyrolysis | 最大失重速率对应的温度(Tp)/℃ temperature of the maximum weight loss rate | 最大失重速率(DTGmax)/(%·min-1) the maximum weight loss rate | 失重率/% quality loss |
10 | 198 | 386 | 360 | 8.4 | 64.3 |
20 | 208 | 405 | 371 | 15.7 | 65.1 |
30 | 216 | 432 | 379 | 18.3 | 66.9 |
Table 3
Kinetic parameters acquired by FWO method"
转化率(α)/% conversion rate | 活化能(E)/(kJ·mol-1) reaction activation energy | 指前因子(A)/min-1 pre-finger factor | 相关系数(R2) correlation coefficient |
10 | 221.8 | 8.66×1012 | 0.97552 |
20 | 225.8 | 5.90×1012 | 0.96367 |
30 | 263.9 | 4.40×1015 | 0.97563 |
40 | 283.8 | 5.42×1016 | 0.96367 |
50 | 286.2 | 1.79×1016 | 0.99264 |
60 | 275.5 | 1.12×1015 | 0.99573 |
70 | 250.5 | 5.87×1012 | 0.99913 |
80 | 223.1 | 5.74×109 | 0.99049 |
Table 4
Common reaction mechanisms for solid feed stock decomposition"
反应机理 reaction mechanism | 符号 symbol | f(α) | G(α) | δ2 | |
FWO | KAS | ||||
随机成核 Avrami-Erofeev | A3/2 | [-ln(1-α)] | 21.84 | 22.17 | |
随机成核 Avrami-Erofeev | A2 | 2(1-α)[-ln(1-α)] | [-ln(1-α)] | 2.17 | 2.08 |
随机成核 Avrami-Erofeev | A3 | 3(1-α)[-ln(1-α)] | [-ln(1-α)] | 2.28 | 2.16 |
随机成核 Avrami-Erofeev | A4 | 4(1-α)[-ln(1-α)] | [-ln(1-α)] | 2.39 | 2.26 |
一维扩散 one-dimensional diffusion | D1 | α2 | 5.80 | 5.86 | |
二维扩散 two-dimensional diffusion | D2 | [-ln(1-α)]-1 | α+(1-α)ln(1-α) | 10.83 | 11.01 |
三维扩散 three-dimensional diffusion(Jander) | D3 | 1- | 15.08 | 15.33 | |
四维扩散 four-dimensional diffusion (Ginstring-Brounshtein) | D4 | [1-(1-α) | 30.58 | 30.99 | |
0级反应zero-order | F0 | 1 | α | 2.98 | 2.88 |
一级反应first-order | F1 | 1-α | -ln(1-α) | 4.51 | 4.56 |
二级反应second-order | F2 | (1-α)2 | (1-α)-1-1 | 54.17 | 54.75 |
三级反应third-order | F3 | (1-α)3 | 989.39 | 991.98 | |
幂定律power law | P2 | 2α | α | 2.87 | 2.72 |
幂定律power law | P3 | 3α | α | 2.85 | 2.70 |
幂定律power law | P4 | 4α | α | 2.84 | 2.68 |
相界反应 contracting cylinder | R2 | 2(1-α) | 1-(1-α) | 2.91 | 2.86 |
相界反应 contracting cylinder | R3 | 3(1-α) | 1-(1-α) | 3.12 | 3.11 |
Table 5
Kinetic parameters acquired by KAS method"
转化率(α)/% conversion rate | 活化能(E)/(kJ·mol-1) reaction activation energy | 指前因子(A)/min-1 pre-finger factor | 相关系数(R2) correlation coefficient |
10 | 220.1 | 8.04×1011 | 0.96681 |
20 | 223.7 | 5.88×1011 | 0.96068 |
30 | 260.2 | 4.41×1014 | 0.97387 |
40 | 282.7 | 5.38×1015 | 0.97613 |
50 | 286.9 | 1.76×1015 | 0.98423 |
60 | 274.8 | 1.11×1014 | 0.97652 |
70 | 251.5 | 5.77×1011 | 0.98601 |
80 | 222.4 | 5.60×109 | 0.98960 |
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