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1 实验材料与方法
1.1 实验材料
Fig. 1 Images of samples

Table 1 Proximate and ultimate analysis of raw materials
样品 | 工业分析/% | 元素分析/% | ||||||||
Ad | Vd | FCd | Cd | Hd | Nd | St,d | Od | |||
豆粉 | 6.3 | 83.7 | 10.0 | 53.6 | 7.0 | 5.7 | 0.5 | 26.9 | ||
木质素 | 15.3 | 54.5 | 30.2 | 49.8 | 4.5 | 0.3 | 1.0 | 29.1 | ||
尼龙66 | 0.0 | 99.9 | 0.1 | 60.5 | 7.6 | 14.3 | 0.5 | 17.1 |
1.2 慢速热解
1.3 快速热解和燃烧
Fig. 2 Experimental device of experimental tests

2 结果与讨论
2.1 慢速热解下豆粉+木质素混合失重特性与NOx前驱物释放特性
2.1.1 失重特性
Fig. 3 TG/DTG curve of soya and lignin mixture pyrolysis

2.1.2 NH3、HCN、HNCO释放特性
Fig. 4 FTIR spectra for pyrolysis products of soya at 300 °C /380 °C


Fig. 6 FTIR spectrum for pyrolysis products of soya and lignin mixture at 285 °C
Fig. 6 FTIR spectrum for pyrolysis products of soya and lignin mixture at 285 °C

Fig. 7 Evolution profiles of NOx precursors throughout soya and lignin mixture pyrolysis
Fig. 7 Evolution profiles of NOx precursors throughout soya and lignin mixture pyrolysis

Fig. 8 FTIR spectrum for pyrolysis products of soya and lignin mixture at 680 °C
Fig. 8 FTIR spectrum for pyrolysis products of soya and lignin mixture at 680 °C

2.2 快速热解下木质素对NOx前驱物生成的影响
2.2.1 失重特性
Dma=Dmsoya/PA66·ωsoya/PA66+DmLigωLig
|
Table 2 Comparison of experimental and theoretical values of char productive rate and weight loss
样品 | 原料质量/g | 木质素质量/g | 半焦质量/g | 实际失重率/% | 理论失重率/% |
豆粉 | 1.00 | 0 | 0.25 | 74.7 | — |
豆粉+木质素 | 0.50 | 0.50 | 0.41 | 58.9 | 53.6 |
尼龙66 | 1.00 | 0 | 0.02 | 97.8 | — |
尼龙66+木质素 | 0.50 | 0.50 | 0.36 | 64.1 | 65.2 |
木质素 | 0 | 1.00 | 0.67 | 32.6 | — |
2.2.2 快速热解条件下NH3、HCN释放特性
Fig. 9 Nitrogen conversion rate of samples pyrolysis

η=ηsoya/PA66·ωsoya/PA66·msoya/PA66+ηLig·ωLig·mLigωsoya/PA66·msoya/PA66+ωLig·mLig
|
R-CO-NH-R′ + H2O → R-CO2H + R′NH2
| (1) |
CH3–COOH → CH2CO + H2O
| (2) |
CH3–COOH → CH4 + CO2
| (3) |
R′-NH2 → R′ + NH2
| (4) |
NH2 + R–H → R′ + NH3
| (5) |
R-CO-NH2 + H2O → R-CO2H + NH3
| (6) |
R-CO2H → R–H+ CO2
| (7) |
CH3-CO-NH2 → CH2-CO + NH3
| (8) |
2.3 木质素对燃烧过程NOx释放的影响
2.3.1 燃烧失重特性
Fig. 10 TG and DTG curves of soya combustion

Fig. 11 FTIR spectra for combustion products of soya at 295 °C /505 °C


2.3.2 快速燃烧NH3、HCN、NOx释放特性
Table 3 Conversion rate of N-containing gas in combustion
样品 | NH3 转化率/% | HCN |
豆粉 | 37.7 | 未测出. |
豆粉+木质素 | 39.2 | 未测出 |
木质素 | 8.9 | 未测出 |
尼龙66+木质素 | 12.0 | 未测出 |
尼龙66 | 15.5 | 未测出 |
Fig. 13 Variation of NOx content throughout soya, lignin and their mixture combustion
Fig. 13 Variation of NOx content throughout soya, lignin and their mixture combustion
