贫煤O2/CO2气氛下燃烧时内在矿物质对SO2和NOx排放特性的影响

李文秀; 王宝凤; 任杰; 张锴; 杨凤玲; 程芳琴

贫煤O₂/CO₂气氛下燃烧时内在矿物质对SO₂和NO_x排放特性的影响

1.
山西大学山西低附加值煤基资源高值利用协同创新中心, 山西太原 030006
2.
晋能长治热电有限公司, 山西长治 046011
3.
华北电力大学热电生产过程污染物监测与控制北京市重点实验室, 北京 102206

基金项目:

NSFC-山西省联合基金重点项目 U1610254

山西省科技重大专项项目 MD2015-01

山西省重点研发计划（国际合作）项目 201603D421041

详细信息

通讯作者:
程芳琴, Tel:0351-7018813, E-mail:cfangqin@sxu.edu.cn

中图分类号: TQ534
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- 被引次数: 0
出版历程
- 收稿日期: 2017-06-01
- 修回日期: 2017-08-23
- 网络出版日期: 2021-01-23
- 刊出日期: 2017-10-10

Effect of mineral matter on emissions of SO₂ and NO_x during combustion of lean coal in O₂/CO₂ atmosphere

1.
Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes, Shanxi University, Taiyuan 030006, China
2.
Jinneng Changzhi Co-generation co, Ltd, Changzhi 046011, China
3.
Energy & Power Engineering School, North China Electric Power University, Beijing 102206, China

Funds:

the National Natural Science Foundation of China-Shanxi coal based low carbon joint fund U1610254

Shanxi Provincial Science and Technology Major Projects MD2015-01

Key Research and Development program of Shanxi province (International Cooperation) 201603D421041

摘要

摘要: 利用管式炉反应器在550-1 000℃对长治贫煤和脱矿物质煤分别在空气和O₂/CO₂气氛进行了燃烧实验。利用XRF、XRD等分析手段，对煤样的基本性能进行了分析表征，并采用热分析仪（TG-DTG）以及傅里叶红外气体分析仪（Antaris-IGS）对贫煤燃烧过程中的燃烧特性和SO₂和NO_x释放规律进行了研究。结果表明，与原煤相比，脱矿物质煤的着火温度和燃烬温度有所降低；O₂/CO₂气氛下，原煤和脱矿物质煤的着火温度和燃烬温度都升高，说明当O₂浓度为20%时，空气气氛比O₂/CO₂气氛更易于着火和燃烬。此外，与长治原煤相比，脱矿物质煤在相同条件下燃烧时SO₂的释放量明显提高，而NO_x的释放量却有所降低。O₂/CO₂气氛下原煤燃烧时SO₂浓度比空气气氛下的要高，而脱矿物质煤燃烧时释放的SO₂浓度明显比空气气氛下的低；O₂/CO₂气氛下原煤和脱矿物质煤燃烧时释放的NO_x浓度比空气气氛下燃烧时释放的NO_x浓度要低。
- 贫煤 /
- 富氧燃烧 /
- 硫 /
- 氮 /
- 排放特性
Abstract: Combustion experiments of Changzhi coal at 550-1 000℃ were conducted in a tube furnace reactor in air and O₂/CO₂, respectively. The XRF, XRD etc. were employed to study the characteristics of raw coal and its demineralized coal. Effects of mineral matter in coal on combustion characteristics and release of SO₂ and NO_x during combustion were investigated using TG-DTG and Antaris-IGS. The results show that ignition and burnout temperature of the demineralized coal are lower than those of raw coal. In O₂/CO₂ the ignition and burnout temperature of raw coal and the demineralized coal are all higher. This shows that when oxygen concentration is 20%, the coals are easier to ignite and burnout in air. Besides that, SO₂ emission of the demineralized coal is higher than that of raw coal; while NO_x emission is opposite. For raw coal, SO₂ emission is higher when combusted in O₂/CO₂; while for the demineralized coal, it is opposite. During combustion in O₂/CO₂, NO_x emission is always lower whether for the raw or the demineralized coal.
- lean coal /
- oxy-fuel combustion /
- sulfur /
- nitrogen /
- emission characteristics

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图 1 管式炉实验系统示意图

Figure 1 Schematic diagram of the tube furnace experimental system

1: mass flowmeter; 2: tube furnance; 3: quartz crucible; 4: thermalcouple; 5: Antaris-IGS; 6: computer

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图 2 长治贫煤和脱矿物质煤的XRD分析

Figure 2 Analysis of XRD patterns of the raw coal and the demineralized coal

K: kaolinite(Al₂Si₂O₅(OH)₄); Q: quartz(SiO₂) C: calcite(CaCO₃); P: pyrites (FeS₂)

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图 3 原煤和脱矿物质煤的SEM-EDS照片

Figure 3 Typical SEM-EDS images of raw coal and demineralized coal

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图 4 原煤和脱矿物质煤的FT-IR谱图

Figure 4 FT-IR spectra of raw coal and demineralized coal

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图 5 原煤不同气氛下的TG-DTG曲线

Figure 5 Thermogravimetric (TG) and derivative thermogravimetric (DTG) curves of raw coal in the atmosphere of air and O₂/CO₂

(a): air; (b): 20%O₂ + 80%CO₂

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图 6 脱矿物质煤在不同气氛下的TG-DTG曲线

Figure 6 Thermogravimetric (TG) and derivative thermogravimetric (DTG) curves of demineralized coal in the atmosphere of air and O₂/CO₂

(a): air; (b): 20%O₂ + 80%CO₂

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图 7 原煤不同温度下SO₂和NO_x 的排放特性

Figure 7 SO₂and NO_x release of raw coal at different temperatures

(a): SO₂-air; (b): SO₂-20%O₂ + 80%CO₂; (c): NO_x -air; (d) NO_x -20%O₂ + 80%CO₂ ■: 550 ℃; ●: 600 ℃; ▲: 700 ℃; $\blacktriangledown$ : 850 ℃; ◆: 900 ℃; $\blacktriangleleft$ : 1 000 ℃

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图 8 脱矿物质煤不同温度下SO₂和NO_x 的排放特性

Figure 8 SO₂ and NO_x release of demineralized coal at different temperatures

(a): SO₂-air; (b): SO₂-20%O₂ + 80%CO₂; (c): NO_x -air; (d): NO_x -20%O₂ + 80%CO₂ ■: 550 ℃; ●: 600 ℃; ▲: 700 ℃; $\blacktriangledown$ : 850 ℃; ◆: 900 ℃; $\blacktriangleleft$ : 1 000 ℃

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表 1 煤的工业分析和元素分析

Table 1 Proximate and ultimate analysis of coal samples

Sample	Proximate analysis w_ad/%				Ultimate analysis w_ad/%
Sample	M	A	V	FC	C	H	N	O^*	S_t
CZ lean coal	0.58	32.48	12.91	54.03	58.36	2.93	0.84	2.87	1.94
CZ coal dem	1.28	2.12	13.32	83.28	86.47	3.85	1.04	2.44	2.80
^*: by difference

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表 2 硫的形态分析

Table 2 Forms of sulfur

Sample	Content w_ad /%
Sample	S_t	S_s	S_p	S_o
CZ lean coal	1.94	0.01	0.75	1.18
CZ coal dem	2.80	0.05	0.99	1.76

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表 3 煤的灰成分分析

Table 3 Chemical composition of the coal ashes

Sample	Content w_ad /%
Sample	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	K₂O	Na₂O	P₂O₅	TiO₂
CZ lean coal	58.10	34.80	3.63	4.25	0.64	1.43	0.46	＜0.10	1.21
CZ coal dem	0.27	0.23	5.51	0.11	-	-	-	-	0.75
-: not detecte

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表 4 脱矿前后煤样的比表面积

Table 4 BET surface area of the coal before and after demineralization

Sample	Pore volume v/(cm³·g^-1·10^-3)	BET surface area A/(m²·g^-1)	Average pore diameter d/nm
CZ lean coal	0.007 234	4.2	6.8
CZ coal dem	0.007 248	4.5	6.5

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