生物质燃烧源PM<sub>2.5</sub>在水汽条件下长大特性的研究

徐俊超; 于燕; 张军; 孟强; 钟辉; 尹艳山

生物质燃烧源PM_2.5在水汽条件下长大特性的研究

徐俊超¹,
于燕¹,
张军^1, ,,
孟强¹,
钟辉¹,
尹艳山²

东南大学能源热转换及其过程测控教育部重点实验室能源与环境学院, 江苏南京 210096
长沙理工大学能源高效清洁利用湖南省高校重点实验室, 湖南长沙 410114

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中图分类号: X513
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出版历程
- 收稿日期: 2015-11-23
- 修回日期: 2016-01-11
- 网络出版日期: 2021-01-23
- 刊出日期: 2016-04-30

Growth characteristics of biomass-fired PM_2.5 with vapor condensation

Key Laboratory of Energy Thermal Conversion Control of Ministry of Education, Southeast University, Nanjing 210096, China
Key Laboratory of Efficient & Clean Energy Utilization of Hunan Province, Changsha University of Science & Technology, Changsha 410014, China

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Corresponding author: E-mail: junzhang@seu.edu.cn.

摘要

摘要: 研究了生物质燃烧源产生的细颗粒在水汽条件下的长大特性,通过生长管实验研究了不同的热水温度、颗粒初始浓度、颗粒在生长管中的停留时间及表面活性剂下生物质燃烧源细颗粒在水汽过饱和条件中的长大特性。与燃煤细颗粒在水汽条件下的长大结果进行对比,生物质燃烧源细颗粒的长大效果要比燃煤细颗粒长大效果要好,热水温度的升高、停留时间的延长有利于细颗粒的长大,小粒径段颗粒的长大则几乎不受颗粒初始浓度的影响,添加一定量的表面活性剂可以使得生物质燃烧源细颗粒全部长大至1μm以上。
- 生物质 /
- PM_2.5 /
- 过饱和水汽 /
- 表面活性剂 /
- 长大特性
Abstract: The growth characteristic of biomass-fired PM_2.5 with vapor condensation was studied. A growth tube was employed to investigate the growth performance of PM_2.5 at various temperatures of water, initial concentrations of particles, residence times and surfactants. The results show that the growth performance of PM_2.5 from biomass combustion is better than that of coal-fired PM_2.5 with vapor condensation. Furthermore, both the water temperature increase and the residence time delay benefit the growth of PM_2.5. Unlike the growth of PM_2.5 from coal combustion, the growth of small size of particles is seldom affected by the initial particles concentration. However, with a certain amount of surfactant addition, the particles can all grow up to 1 μm .
- biomass /
- PM_2.5 /
- supersaturation vapor /
- surfactant /
- growth characteristic

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图 1 实验系统示意图

Figure 1 Experimental system

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图 2 生物质燃烧源原始细颗粒粒径分布

Figure 2 Initial particle size distribution from biomass combustion

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图 3 不同热水温度下生物质细颗粒的长大效果

Figure 3 Particle size distribution under different water temperature

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图 4 不同热水温度下燃煤细颗粒的长大效果^[22]

Figure 4 Particle size distribution of particles from coal combustion under different water temperatures

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图 5 不同停留时间下生物质细颗粒物长大效果

Figure 5 Particle size distribution under different residence times

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图 6 不同的初始浓度下生物质细颗粒的长大效果

Figure 6 Particle size distribution under different initial particle concentrations

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图 7 不同表面活性剂条件下生物质细颗粒的长大效果

Figure 7 Particle size distribution under different amount of surfactant addition

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表 1 实验工况

Table 1 Experimental condition

Para-meter	Temperature T/K	Residence time t/s	Initial concentration /cm^-3	Surfactant addition /(g·L^-1)
1	303	1.20	1.7×10⁶	N/A
	313	1.20	1.7×10⁶	N/A
	323	1.20	1.7×10⁶	N/A
2	323	1.20	1.7×10⁶	N/A
	323	1.20	3.4×10⁶	N/A
3	323	1.20	1.7×10⁶	N/A
	323	2.21	1.7×10⁶	N/A
4	323	1.20	1.7×10⁶	20
	323	1.20	1.7×10⁶	30
	323	1.20	1.7×10⁶	40

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表 2 不同温度热水下生物质灰颗粒平均粒径

Table 2 Mean size of droplets containing particles under different water temperatures

Temperature T/K	N/A	303	313	323
Mean size d/nm	1272(initial)	1400	2070	2610

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表 3 生长管中平均过饱和度

Table 3 Average supersaturation in the growth tube

Temperature T/K	303	313	323
Supersaturation S	1.0202	1.0938	1.2078

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表 4 生物质燃烧颗粒与燃煤颗粒的化学组分

Table 4 Chemical composition of biomass-fired particles and coal-fired particles

Chemical compostion	Content w/%
Chemical compostion	Na₂O	MgO	Al₂O₃	SiO₂	P₂O₅	SO₃	CaO	K₂O	Fe₂O₃	Cl	TiO₂
Biomass-fired particles	0	1.78	5.00	40.6	4.99	5.4	22.74	8.88	4.47	3.37	0.55
Coal-fired partilces	1.3	1.33	23.2	55.6	0.75	0.61	5.1	2.4	7.3	0	0.53

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表 5 不同表面活性剂条件下生物细颗粒物的最终平均直径

Table 5 Mean size of droplets contain particle under different amount of surfactant addition

Concentration	N/A	n=20g/L	n=30g/L	n=40g/L
Mean size d/nm	1272(initial)	3005	3419	3513

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