水热污泥与煤在混燃过程中的协同效应特性研究

庄修政; 宋艳培; 詹昊; 阴秀丽; 吴创之

水热污泥与煤在混燃过程中的协同效应特性研究

庄修政^{1, 2},
宋艳培^{1, 2},
詹昊^{2, 3},
阴秀丽^1, ,,
吴创之¹

1.
中国科学院广州能源研究所中国科学院可再生能源重点实验室广东省新能源和可再生能源重点实验室, 广东广州 510640
2.
中国科学院大学, 北京 100049
3.
中国科学院广州地球化学研究所有机地球化学国家重点实验室广东省环境保护与资源利用重点实验室, 广东广州 510640

基金项目:

国家重点研发项目 2016YFE0203300

广东省自然科学基金项目 2017B030308002

广州市科技计划项目 201803030006

详细信息

中图分类号: TK6
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- 被引次数: 0
出版历程
- 收稿日期: 2018-08-06
- 修回日期: 2018-09-19
- 网络出版日期: 2021-01-23
- 刊出日期: 2018-12-10

Synergistic effects in co-combusting of hydrochar derived from sewage sludge with different-rank coals

ZHUANG Xiu-zheng^{1, 2},
SONG Yan-pei^{1, 2},
ZHAN Hao^{2, 3},
YIN Xiu-li^{1
, ,},
WU Chuang-zhi¹

1.
Key Laboratory of Renewable Energy, CAS, Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Key Laboratory of Organic Geochemistry, CAS, Guangdong Key Laboratory of Environmental Protection and Resource Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Funds:

the National Key R & D Project 2016YFE0203300

the Guangdong Natural Science Foundation 2017B030308002

the Guangzhou Science and Technology Project 201803030006

More Information

Corresponding author: YIN Xiu-li, E-mail: xlyin@ms.giec.ac.cn

摘要

摘要: 以城市污泥衍生的水热污泥（SS-derived hydrochar）为对象，结合傅里叶红外光谱分析（FT-IR）、X射线荧光光谱分析（XRF）和X射线衍射分析（XRD）等对比研究了水热污泥与三种不同品阶煤（褐煤、烟煤和无烟煤）在有机/无机结构与燃料特性上的异同；同时，通过热重（TG）与偏差分析（Deviation）考察水热污泥与各阶煤在不同混合比例条件下的协同燃烧行为及其作用机制。结果表明，污泥经过水热处理后其有机结构和燃烧行为均提升至与煤相似的水平，该过程不仅改善污泥的燃烧特性，并增强其与煤之间的协同燃烧效应。水热污泥中适量的轻质组分与（碱）碱土金属能在混合燃烧过程中加速煤的失重速率，其对三种煤的促进作用可达4.4%-16.1%（褐煤）、1.9%-9.4%（烟煤）和4.8%-12.1%（无烟煤）。总体而言，水热污泥与褐煤混合而成的燃料在燃料性能上具有较大的优势，并且其混合比例以30%（水热污泥）：70%（褐煤）与50%（水热污泥）：50%（褐煤）为宜。
- 污泥 /
- 水热炭化 /
- 煤 /
- 混合燃烧 /
- 协同效应
Abstract: Differences on organic/inorganic structures and fuel properties between sewage sludge-derived hydrochar and different-rank coals were investigated and compared with the help of FT-IR, XRF and XRD technologies. Meanwhile, the combustion behavior under various blending ratio and its synergistic effects was identified via TG and deviation analysis. The results demonstrates that the organic structures and combustion behaviors of hydrochar are similar to those of coals, which not only improves the combustion properties of sewage sludge, but also enhances the synergistic effects in co-combustion of hydrochar and coals. During the co-combustion process, light volatiles and (alkaline) alkaline-earth metals in hydrochar could accelerate the weight loss rate for coals, reaching 4.4%-16.1%, 1.9%-9.4% and 4.8%-12.1% for lignite, bitumite and anthracite, respectively. In general, the blends with 30% hydrochar and 70% lignite or 50% hydrochar and 50% lignite are better than other blends in terms of comprehensive combustion evolutions.
- sewage sludge /
- hydrothermal carbonization /
- coal /
- co-combustion /
- synergistic effects

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图 1 原料的傅里叶红外光谱谱图

Figure 1 FT-IR results of SS, hydrochar and coals

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图 2 原料的无机组分含量

Figure 2 Inorganic components of SS, hydrochar and coals

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图 3 原料的单独燃烧曲线及其芳构化程度

Figure 3 Mono-combustion behavior and aromaticity of SS, hydrochar and coals

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图 4 水热污泥与煤的混合燃烧曲线

Figure 4 Profiles of co-combustion behavior of blends

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图 5 水热污泥与煤的混合燃烧的协同效应

Figure 5 Variation of the derivation of mixed fuels in different blending ratio

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表 1 污泥、水热污泥及各种煤的原料特性

Table 1 Properties of sewage sludge, SS-derived hydrochar, and coals

Sample	Proximate analysis w_d/%			Ultimate analysis w_daf/%					Q_HHV/ (J·g^-1)
Sample	V	FC	A	C	H	O	N	S	Q_HHV/ (J·g^-1)
SS	39.30	4.20	56.50	50.02	6.42	40.12	3.02	0.42	9403
Hydrochar	21.71	1.91	76.38	13.55	2.09	83.01	1.09	0.26	6637
Coal A	50.32	42.94	6.74	59.87	4.55	34.10	0.98	0.50	24306
Coal B	29.35	56.36	14.29	68.53	4.05	25.76	0.92	0.74	27959
Coal C	12.02	72.27	15.71	66.09	3.26	29.77	0.47	0.41	27989
note: V：volatile matters; A：ash; FC：fixed carbon; O (oxygen) was calculated by difference based on dry ash-free base; Q_HHV：higher heating value

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表 2 单独燃烧的温度区间与特征温度点

Table 2 Combustion stages and characteristic temperatures of biowastes and coals

Sample	Temperature range t/℃			Weight loss w/%		Residues w/%	Characteristic temperatures t/℃
Sample	stage 1	stage 2	stage 3	stage 2	stage 3	Residues w/%	t_i	t_max	t_b
SS	50-155	155-375	375-615	26.76	10.81	57.33	227	298	595
Hydrochar	50-120	145-355	355-615	9.94	12.02	75.19	249	390	600
Coal A	50-140	-	255-537	-	87.24	5.48	328	395	626
Coal B	-	-	374-712	-	83.66	14.77	455	552	715
Coal C	-	-	325-739	-	82.13	15.96	539	608	740

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表 3 混合燃料的基本特性

Table 3 Proximate, ultimate and HHV analyses of mixed fuels

Sample	Proximate analysis w_d/%			Ultimate analysis w_daf/%					Q_HHV /(MJ·kg^-1)
Sample	A	V	FC	C	H	O	N	S	cal-V	exp-V
30S:70A	26.63	42.73	30.64	45.59	4.14	48.83	1.01	0.43	19.0	20.2
50S:50A	40.62	36.27	23.11	37.79	3.48	57.36	0.99	0.38	15.5	16.4
70S:30A	54.63	30.59	14.78	28.96	2.98	66.73	1.00	0.33	11.9	12.6
30S:70B	32.33	26.15	41.52	52.88	3.51	42.06	0.95	0.60	21.6	21.6
50S:50B	45.37	24.82	29.81	41.37	3.19	53.94	1.00	0.50	17.3	17.7
70S:30B	57.95	23.65	18.40	30.31	2.69	65.59	1.01	0.40	13.0	13.2
30S:70C	34.17	14.88	50.95	50.44	2.49	46.04	0.67	0.36	21.6	21.7
50S:50C	45.80	17.22	36.98	40.24	2.35	56.36	0.72	0.33	17.3	17.4
70S:30C	57.69	19.01	23.30	30.79	2.18	65.91	0.82	0.30	13.0	13.2
note: V, volatile matters; A, ash; FC, fixed carbon; HHV, higher heating value; cal-V, calculated value; exp-V, experimental value; d, on dry base; daf, on dry ash-free base

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表 4 水热污泥与煤混合燃烧的动力学参数

Table 4 Co-combustion kinetic parameters for hydrochar and coals

Sample	Stage 2				Stage 3
Sample	region/℃	E₁/(kJ·mol^-1)	A₁/min^-1	R²	region/℃	E₂/ (kJ·mol^-1)	A₂/min^-1	R²
Hydrochar	150-370	19.31	0.02	0.9649	370-600	21.39	0.02	0.9710
Coal A	-	-	-	-	240-500	60.09	7.08	0.9791
Coal B	-	-	-	-	375-625	97.15	298.47	0.9964
Coal C	-	-	-	-	500-700	136.85	1344.17	0.9896
30S:70A	-	-	-	-	220-530	50.82	32.46	0.9925
50S:50A	-	-	-	-	230-520	39.23	5.44	0.9843
70S:30A	-	-	-	-	225-515	30.20	0.12	0.9712
30S:70B	260-420	40.23	0.02	0.9939	420-625	84.34	50.38	0.9846
50S:50B	200-410	30.20	＜0.01	0.9990	410-625	68.77	4.64	0.9793
70S:30B	185-445	20.93	＜0.01	0.9759	445-625	60.22	1.35	0.9803
30S:70C	250-485	26.97	＜0.01	0.9993	485-690	125.50	1098.58	0.9981
50S:50C	225-480	21.21	＜0.01	0.9978	480-690	107.09	903.05	0.9950
70S:30C	225-480	20.92	＜0.01	0.9842	480-690	99.20	797.74	0.9838
note: E₁ and A₁ are the activation energy and pre-exponential factor for stage 2, respectively, while E₂ and A₂ are for stage 3

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表 5 水热污泥与煤混合燃烧的性能评价

Table 5 Combustibility index values for hydrochar and coals

Sample	Characteristic temperature (t/℃)			DTG/(%·℃^-1)		S×10¹⁰	R×10⁴
Sample	t_i	t_b	t_max	(dw/dt)_max	(dw/dt)_mean	S×10¹⁰	R×10⁴
Hydrochar	249	600	390	0.10	0.03	0.81	2.20
Coal A	328	626	395	0.94	0.11	15.35	20.44
Coal B	455	715	552	0.75	0.10	5.07	11.67
Coal C	539	740	608	0.86	0.10	4.00	12.15
30S:70A	322	495	387	0.69	0.08	10.76	15.31
50S:50A	303	486	375	0.60	0.07	9.41	13.74
70S:30A	302	478	375	0.39	0.05	4.47	8.93
30S:70B	450	624	533	0.55	0.08	3.48	8.86
50S:50B	427	615	532	0.42	0.07	2.62	6.78
70S:30B	406	612	530	0.25	0.05	1.24	4.05
30S:70C	522	685	600	0.63	0.08	2.70	9.02
50S:50C	515	678	600	0.46	0.06	1.54	6.58
70S:30C	469	675	597	0.29	0.05	0.29	4.17

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