低阶煤与玉米芯低温共热解的产物特性分析

doi:10.3969/j.issn.1673-5854.2019.04.004

Abstract

Abstract:

Low temperature distillation equipment was used to study the low temperature co-pyrolysis of lignite and corncob under different proportions. The results showed that when the corncob content was 30%, the tar yield reached 11.70%, which was 53.75% higher than that of the lignite mono-pyrolysis. With the addition of corncob, the contents of CO, CH₄ and H₂ in pyrolysis gas gradually increased. The results of GC-MS showed that as adding 30% corncob, aliphatic content increased from 24% to 30.67%, the phenol content increased from 6.29% to 18.49%, heteroatom content decreased from 29.75% to 13.33%, which achieved a substantial pyrolysis of tar and high-quality tar generation. The SEM, BET and heat value analysis of pyrolysis char showed that the surface of co-pyrolysis char became more rough, and the pore structure was improved. The heat value of co-pyrolysis char was obviously higher than the lignite pyrolysis separately.

Key words: lignite, corncob, co-pyrolysis, char

CLC Number:

TQ35
TK6

Ping KE,Xuanming HE,Jing LIU,Dongzheng FENG. Characteristics of Low Temperature Co-pyrolysis Products of Low-rank Coal and Corncob[J]. Biomass Chemical Engineering, 2019, 53(4): 26-30.

Figures/Tables 6

Table 1

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Table 3

References 21

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样品 sample	元素分析ultimate analysis/%					H/C	工业分析proximate analysis/%
样品 sample	C	H	O¹⁾	N	S	H/C	水分 moisture	灰分 ash	挥发分 volatile	固定碳 fixed carbon
褐煤lignite	54.82	3.18	21.22	1.26	0.34	0.70	10.53	8.68	38.90	41.89
玉米芯corncob	37.28	6.03	32.97	0.94	0.13	1.94	10.25	15.40	60.70	13.65

%
样品 sample	脂肪族 aliphatic compounds	芳香族 aromatic compounds	酚 phenol	酯 ester	酸 acid	醛 aldehyde	醇 alcohol	杂原子 heteroatom compounds
褐煤lignite	24.00	8.71	6.29	11.81	0.53	0.02	18.61	29.75
玉米芯corncob	34.55	6.40	5.99	7.96	2.33	4.19	15.71	21.71
30%混合样30% mixture	30.67	8.57	18.49	8.43	0.39	1.85	17.90	13.33

样品 samples	比表面积/(m²·g^-1) specific surface area	总孔容积/(cm³·g^-1) pore volume	平均孔径/nm pore size
褐煤半焦lignite char	309.90	0.20	5.11
玉米芯半焦corncob char	32.74	0.03	33.42
30%混合物半焦30% mixture char	289.70	0.18	4.43

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Characteristics of Low Temperature Co-pyrolysis Products of Low-rank Coal and Corncob

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