Performances and kinetics analyses of co-combustion of alcohol extracted herb residue and wasted activated coke

doi:10.11949/0438-1157.20201333

Abstract

Abstract:

The combustion characteristics of alcohol extracted herb residue, wasted activated cokes and their mixtures with different proportions at different heating rates were studied by thermogravimetric analysis, and the combustion kinetic parameters were calculated by The Coats-Redfern method. The results showed that the combustion of alcohol extracted herb residues was a continuous process of volatiles and a small amount of fixed carbon, while that of wasted activated cokes was mainly a process of fixed carbon combustion. The alcohol extracted herb residues had better combustion characteristics and lower average activation energy than wasted activated coke. TG-MS analyzer was used to compare the flue gases produced from the combustions of alcohol extracted herb residues and its mixture. The results show that the addition of waste activated coke has a significant adsorption and reduction effect on the NO_x produced during the combustion of alcohol-extracted herb residue. The kinetic analyses showed that the activation energy of the mixture of alcohol extracted herb residues and wasted activated cokes decreased with the increasing addition amount of alcohol extracted herb residues compared to pure wasted activated cokes, which improved the reaction activities of wasted activated cokes to boost their combustion. The use of thermogravimetric analysis to predict the combustion properties of mixed fuels is reliable, and has a guiding role in the development of technology for co-combustion treatment of alcohol-extracted herb residues and waste activated coke.

Key words: alcohol extracted herb residues, wasted activated coke, thermogravimetric analysis, combustion characteristics, kinetic analysis

摘要：

采用热重分析法研究了不同升温速率下醇提中药渣、废弃活性焦及其不同比例混合物的燃烧特性，并利用Coats-Redfern方法计算其燃烧动力学参数。结果表明，醇提中药渣燃烧是挥发分和少量固定碳连续燃烧过程，而废弃活性焦燃烧主要是固定碳燃烧的过程；醇提中药渣比废弃活性焦具有更好的燃烧特性和更低的活化能。采用TG-MS联用分析仪对比研究醇提中药渣及其混合物的燃烧过程产生的烟气。结果表明，废弃活性焦的加入对醇提中药渣燃烧过程中产生的NO_x有明显的吸附还原作用。动力学分析表明，与废焦相比，混合物反应活化能随着中药渣比例的增加而变小，表明添加中药渣能提高废焦的反应活性，促进其燃烧。利用热重分析预测混合燃料的燃烧性质可靠，对醇提中药渣与废弃活性焦共燃处理的技术开发具有指导作用。

关键词: 醇提中药渣, 废弃活性焦, 热重分析, 燃烧特性, 动力学分析

CLC Number:

TK 6

ZHU Xinyu, ZHANG Guangyi, ZHANG Jianwei, WEN Hongyan, LI Yunjia, ZHANG Jianling, XU Guangwen. Performances and kinetics analyses of co-combustion of alcohol extracted herb residue and wasted activated coke[J]. CIESC Journal, 2021, 72(2): 1116-1124.

朱新宇, 张光义, 张建伟, 温宏炎, 李运甲, 张建岭, 许光文. 醇提中药渣与废弃活性焦共燃特性及动力学分析[J]. 化工学报, 2021, 72(2): 1116-1124.

Figures/Tables 9

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Sample	Proximate analysis/% (mass)				Ultimate analysis/% (mass)					HHVs/(MJ/kg)
Sample	Moisture	Ash	VM	FC	C	H	N	S	O	HHVs/(MJ/kg)
HR	4.7	14.2	68.5	12.6	40.6	5.1	3.4	1.5	35.1	15.9
WC	4.1	14.1	15.2	66.6	65.4	1.1	2.8	2.2	10.3	24.5

Sample	Proximate analysis/% (mass)				Ultimate analysis/% (mass)					HHVs/(MJ/kg)
Sample	Moisture	Ash	VM	FC	C	H	N	S	O	HHVs/(MJ/kg)
HR	4.7	14.2	68.5	12.6	40.6	5.1	3.4	1.5	35.1	15.9
WC	4.1	14.1	15.2	66.6	65.4	1.1	2.8	2.2	10.3	24.5

Sample	Component content/%
Sample	SO₃	K₂O	P₂O₅	CaO	MgO	SiO₂	Al₂O₃	Na₂O	Fe₂O₃
HR	29.0	28.8	15.8	14.8	6.1	2.0	1.1	0.9	0.6
WC	20.8	0.6	0.5	13.9	1.0	35.3	18.9	0.8	6.6

Sample	Component content/%
Sample	SO₃	K₂O	P₂O₅	CaO	MgO	SiO₂	Al₂O₃	Na₂O	Fe₂O₃
HR	29.0	28.8	15.8	14.8	6.1	2.0	1.1	0.9	0.6
WC	20.8	0.6	0.5	13.9	1.0	35.3	18.9	0.8	6.6

Sample	β/(℃/min)	T_i/℃	T_max/℃	T_h/℃	K_r×10⁵/(min/℃²)	C_b×10⁴/min^-1	S×10^-8/( min^-2·℃^-3)
HR	10	205	451	559	15.44	18.22	44.23
	20	208	293	586	17.50	34.59	89.98
	40	216	305	655	33.91	54.94	254.78
25WC75HR	10	302	462	568	4.32	24.55	11.77
	20	332	468	615	6.72	57.02	30.60
	40	221	302	688	30.05	95.07	216.06
50WC50HR	10	332	456	548	6.58	30.22	17.89
	20	340	460	606	7.77	58.53	36.64
	40	356	532	706	8.24	90.77	55.98
75WC25HR	10	380	460	612	5.39	21.91	12.52
	20	400	465	613	5.69	48.48	26.24
	40	412	540	739	6.45	76.86	40.46
WC	10	440	485	620	4.47	16.71	10.01
	20	448	500	630	5.03	30.11	21.94
	40	450	575	779	5.44	34.27	30.04