不同分布形式的钙盐对燃煤三模态颗粒物生成的影响

张平安; 袁静; 于敦喜; 罗光前; 姚洪

不同分布形式的钙盐对燃煤三模态颗粒物生成的影响

1.
华中科技大学煤燃烧国家重点实验室, 湖北武汉 430074
2.
长江水利委员会水文中游局, 湖北武汉 430012

基金项目:

湖北省科技支撑计划 2014BCB040

详细信息

通讯作者:
姚洪, Tel: +86-27-87545526(O), E-mail: hyao@mail.hust.edu.cn

中图分类号: TK224.1
计量
- 文章访问数: 72
- HTML全文浏览量: 24
- PDF下载量: 6
- 被引次数: 0
出版历程
- 收稿日期: 2015-10-15
- 修回日期: 2016-01-06
- 网络出版日期: 2021-01-23
- 刊出日期: 2016-03-30

Influence of different distributions of Ca-mineral in coal on trimodal particulate matter formation during combustion

1.
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
2.
Middle Changjiang River Bureau of Hydrology and Water Resources Survey, Wuhan 430012, China

Funds:

The project was supported by the Science and technology support program of Hubei Province 2014BCB040

摘要

摘要: 通过物理掺混和溶液浸渍两种方式将醋酸钙添加至烟煤中, 分别制得富含外在钙盐的掺钙煤与富含内在钙盐的浸钙煤, 将原煤、掺钙煤和浸钙煤在沉降炉中进行燃烧实验, 炉膛温度1300℃.收集并分析燃烧生成的颗粒物, 研究不同分布形式的钙盐对三模态颗粒物生成的影响.结果表明, 三种煤燃烧生成的超细模态、中间模态和粗模态颗粒物均分别位于小于0.2、0.2-2.0和大于2.0μm粒径范围内; 内、外在钙盐均促进超细模态颗粒物的生成, 其中, 外在钙盐的促进作用更明显; 内在钙盐抑制中间模态颗粒物的生成, 而外在钙盐促进其生成; 对于粗模态颗粒物的生成, 内在钙盐具有促进作用, 外在钙盐作用不明显.
- 煤燃烧 /
- 煤基质 /
- 内在矿物 /
- 外在矿物 /
- 颗粒物 /
- 生成模态
Abstract: Calcium acetate was added into a bituminous coal through physically blending and impregnation to obtain the ble-Ca coal rich in excluded Ca-mineral and imp-Ca coal rich in included Ca-mineral, respectively. The raw coal, ble-Ca coal and imp-Ca coal were burned in a drop tube furnace at 1300℃. The generated particulate matters (PMs) were collected and analyzed to study the influence of different distributions of Ca-mineral in coal on trimodal PM formation during combustion. The results showed that for the three coals, PMs with the ultrafine mode, central mode and coarse mode were all in the size range of < 0.2μm, 0.2-2μm and >2μm, respectively. The included and excluded Ca-minerals can both promote the formation of ultrafine mode PM, and the excluded one had more significant effect. The included Ca-mineral can restrain, while the excluded one can promote the formation of central mode PM. The included Ca-mineral can promote the formation of coarse mode PM, while the excluded one did not have obvious effect.
- coal combustion /
- coal matrix /
- included mineral /
- excluded mineral /
- particulate matter /
- formation mode

HTML全文

图 1 燃煤颗粒物的生成机理示意图

Figure 1 Mechanisms of PM formation during coal combustion

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图 2 原煤矿物分布(CCSEM分析获得)

Figure 2 Mineral distribution in raw coal (detected by CCSEM)

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图 3 沉降炉结构示意图

Figure 3 Schematic diagram of the drop tube furnace

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图 4 不同煤样燃烧生成颗粒物中Al元素质量粒径分布

Figure 4 Mass fraction size distributions of Al in PMs generated by different coals combustion

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图 5 不同煤样燃烧时超细模态颗粒物的产率

Figure 5 Yields of ultrafine mode PM generated by different coals combustion

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图 6 超细模态颗粒物(DLPI第4级) 中Ca含量

Figure 6 Contents of Ca in ultrafine mode PM (collected on DLPI plate 4) of different coals

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图 7 不同煤样燃烧时中间模态颗粒物的产率

Figure 7 Yields of central mode PM generated by different coals combustion

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图 8 中间模态颗粒物(DLPI第8级) 中Ca含量

Figure 8 Contents of Ca in central mode PM (collected on DLPI plate 8) of different coals

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图 9 不同煤样燃烧时粗模态颗粒物的产率

Figure 9 Yields of coarse mode PM generated by different coals combustion

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图 10 粗模态颗粒物(DLPI第12级) 中Ca含量

Figure 10 Contents of Ca in coarse mode PM (collected on DLPI plate 12) of different coals

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表 1 原煤特性分析

Table 1 Properties of raw coal

Proximate analysis w/%					Ultimate analysis w/%
M	A	V	FC		C	H	N	S	O^*
0.68	36.57	21.54	41.21		50.58	3.14	0.82	3.58	4.64
Major ash components w/%
Na₂O	MgO	Al₂O₃	SiO₂	P₂O₅	SO₃	K₂O	CaO	TiO₂	Fe₂O₃
1.00	1.29	32.31	57.03	0.14	1.71	1.73	0.68	0.87	3.24
^*: by difference

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