飞灰含湿量对耦合电袋除尘器性能影响规律

doi:10.16085/j.issn.1000-6613.2022-1031

摘要/Abstract

摘要：

耦合电袋除尘器在燃煤工业锅炉领域中发展前景广阔。基于耦合电袋除尘器平台，实验研究了不同含湿量飞灰的脱除性能和除尘器运行性能。结果表明：含湿量上升，飞灰堆积密度呈现先减小后增大的趋势，含湿量为0.65%出现谷值。含湿量小于0.65%，除尘器对飞灰的穿透窗口不同，且含湿量增加，出口总尘浓度逐渐降低，整体脱除效率逐渐提高，最终压降和总能耗均逐渐降低，最终压降由含湿量0.31%时的335Pa降低到0.65%时的276Pa，减小了17.61%。除尘器对含湿量0.65%飞灰无穿透窗口，但含湿量高于0.65%，穿透窗口重新出现，且除尘器性能下降。利用质量因子对耦合电袋除尘器整体性能进行综合评价，其随含湿量增加而先增后降，峰值位于含湿量0.64%~0.65%附近。综上，一定范围内提高颗粒含湿量能优化除尘器性能。

关键词: 耦合电袋除尘器, 含湿量, 过滤效率, 能耗, 质量因子

Abstract:

Coupling reinforced electrostatic-fabric integrated precipitator has a promising prospect in the field of coal-fired industrial boilers. The removal performance of coupling reinforced electrostatic-fabric integrated precipitator for different water content and its operational performance were experimentally investigated based on a pilot-scale experimental system. The experimental results showed that the bulk density first decreased and then increased with increasing water content, with valley value at water content of 0.65%. The penetration windows of bag filter distributed at different particle size with water content less than 0.65%, and disappeared with the water content higher than 0.65%. With the water content increasing to 0.65%, the total dust mass concentrations, final pressure drop and the total energy consumption decreased and the collection efficiency increased. The final pressure drop was reduced from 335Pa to 276Pa, with reduction of 17.61%, when the water content rose from 0.31% to 0.65%. However, the total performance became bad with the water content larger than 0.65%. Furthermore, the quality factor was used to comprehensively evaluate the total performance of the coupling reinforced electrostatic-fabric integrated precipitator. It was shown that the quality factor increased and decreased with the increase of water content, with the peak value reaching around 0.64%—0.65%. In summary, the performance of the coupling reinforced electrostatic-fabric integrated precipitator can be enhanced by increasing the water content of the fly ash within certain range, which can provide theoretical guidance for performance optimization of coupling reinforced electrostatic-fabric integrated precipitator.

Key words: coupling reinforced electrostatic-fabric integrated precipitator, water content, filtration efficiency, energy consumption, quality factor

中图分类号:

X701.2

夏少波, 段璐, 王建朋, 纪任山. 飞灰含湿量对耦合电袋除尘器性能影响规律[J]. 化工进展, 2023, 42(4): 2101-2108.

XIA Shaobo, DUAN Lu, WANG Jianpeng, JI Renshan. Effect of water content of fly ash on the performance of coupling reinforced electrostatic-fabric integrated precipitator[J]. Chemical Industry and Engineering Progress, 2023, 42(4): 2101-2108.

图/表 13

图1 实验系统示意图

表1 除尘器进出口湿度变化

空气相对湿度/%	飞灰初始含湿量/%	除尘器进口			除尘器内飞灰含湿量/%	除尘器出口
空气相对湿度/%	飞灰初始含湿量/%	烟气相对湿度/%	飞灰含湿量/%	$d H 2 O$ /g·m^-3	除尘器内飞灰含湿量/%	烟气相对湿度/%	$d H 2 O$ /g·m^-3
27	2.42	29.0	1.10	0.773	0.69	23.0	0.761
27	2.90	31.3	1.21	0.806	0.72	25.8	0.791

表1 除尘器进出口湿度变化

空气相对湿度/%	飞灰初始含湿量/%	除尘器进口			除尘器内飞灰含湿量/%	除尘器出口
空气相对湿度/%	飞灰初始含湿量/%	烟气相对湿度/%	飞灰含湿量/%	$d H 2 O$ /g·m^-3	除尘器内飞灰含湿量/%	烟气相对湿度/%	$d H 2 O$ /g·m^-3
27	2.42	29.0	1.10	0.773	0.69	23.0	0.761
27	2.90	31.3	1.21	0.806	0.72	25.8	0.791

表2 飞灰成分分析和工业分析

成分分析/%											工业分析/%
SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	K₂O	Na₂O	TiO₂	P₂O₅	MnO₂	SO₃	M_ad	A_d	V_d	FC_ad
42.42	13.10	7.22	25.51	1.30	1.31	1.73	0.55	0.069	0.23	5.30	0.12	98.04	1.55	0.40

图2 飞灰粒径分布

图3 5种含湿量飞灰堆积密度

图4 不同含湿量飞灰形貌

图5 飞灰进、出口质量浓度分布和穿透率

图6 耦合电袋除尘器前区脱除效率

图7 除尘器对不同含湿量飞灰的出口总尘浓度和总体除尘效率

图8 压降变化

图9 电流变化

图10 能耗比较

图11 质量因子

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