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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2021, Vol. 55 Issue (11): 2115-2124    DOI: 10.3785/j.issn.1008-973X.2021.11.012
    
Factors affecting discharge performance of high-temperature coal pyrolysis gas
Yi-fei ZHAO(),Meng-xiang FANG*(),Yong-min SHI,Zhi-xiang XIA,Jian-meng CEN
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Abstract  

A laboratory high-temperature discharge system was used to study factors affecting discharge performance of high-temperature coal pyrolysis gas for improving the dust remove efficiency and stability of high-temperature coal pyrolysis gas dust removal, focusing on the influence of temperature, atmosphere, conditioning optimization and power supply polarity on the discharge characteristics of pyrolysis gas. Results show that, increasing the temperature, the discharge current of the pyrolysis gas increases, and the corona and breakdown voltage decrease, which is not conducive to particle removal. For high-temperature pyrolysis gas, reducing the volume fraction of CH4 and increasing the volume fraction of H2 and CO2 reduce the discharge current, increase the corona and breakdown voltage, which is more conducive to particle removal. With adding water vapor, the corona initiation voltage increases, the discharge current obviously decreases, the corona discharge interval is wider, and the V-I characteristic curve shifts to the right, which has a more obvious optimization effect on the discharge performance. Applying voltage via positive polarity power supply at high temperature, the standard gas and the pyrolysis gas after tempering with water vapor have higher breakdown voltage and positive corona discharge area, and the performance is better than that of the negative polarity power supply.

Key words： high-temperature pyrolysis gas      discharge      atmosphere      water vapor      power supply polarity     
Received: 17 December 2020      Published: 05 November 2021
CLC:  TK 01  
Fund:  国家重点研发计划资助项目（2018YFB0605000）
Corresponding Authors: Meng-xiang FANG     E-mail: 21827010@zju.edu.cn;mxfang@zju.edu.cn
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Yi-fei ZHAO
Meng-xiang FANG
Yong-min SHI
Zhi-xiang XIA
Jian-meng CEN
Cite this article:

Yi-fei ZHAO,Meng-xiang FANG,Yong-min SHI,Zhi-xiang XIA,Jian-meng CEN. Factors affecting discharge performance of high-temperature coal pyrolysis gas. Journal of ZheJiang University (Engineering Science), 2021, 55(11): 2115-2124.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.11.012     OR     https://www.zjujournals.com/eng/Y2021/V55/I11/2115


高温热解煤气放电性能的影响因素

为了提高电除尘器净化高温热解煤气时的除尘效率及稳定性，采用实验室高温放电系统研究电除尘器中温度、气氛、气体调质以及电源极性等因素对热解煤气放电性能的影响. 研究结果表明：提高温度，热解煤气的放电电流上升，起晕电压、击穿电压下降，不利于颗粒脱除. 对于高温热解煤气，降低CH4的体积分数、提高H2、CO2的体积分数，使放电电流减小，起晕电压和击穿电压升高，更利于颗粒脱除. 添加水蒸气，起晕电压升高，放电电流减小，电晕放电区间更宽，伏安特性曲线向右偏移，优化了放电性能. 在高温下通过正极性电源施加电压，标准煤气及添加水蒸气调质后的热解煤气都具有较高的击穿电压及正电晕放电区域，性能优于负极性电源.


关键词： 高温热解煤气,  放电,  气氛,  水蒸气,  电源极性 
Fig.1 Schematic diagram of lab-scale high temperature discharge system
气氛组别 φB/%
CH4 H2 CO CO2 N2
标准煤气 49.3 26.0 11.2 8.0 5.75
1 70.0 16.0 6.6 4.8 3.50
2 35.0 33.8 14.5 10.4 7.50
3 40.0 40.0 8.8 6.4 4.00
4 57.4 15.0 12.8 9.0 6.61
5 44.0 23.0 20.0 7.0 5.20
6 55.4 29.2 ? 9.0 6.50
7 43.5 22.6 9.6 20.0 5.00
8 53.2 28.1 12.1 ? 6.21
9 44.0 23.0 10.0 7.0 15.00
Tab.1 High temperature pyrolysis gas experimental atmospheres
Fig.2 Influence of temperature on discharge of pyrolysis gas
Fig.3 Influence of CH4volume fraction on pyrolysis gas discharge at different temperatures
Fig.4 Growth of carbon filaments at 600 ℃
气氛组别 φB/%
CH4 H2 CO CO2 N2 C2H4
入口 70.0 16.0 6.6 4.8 3.5 0
出口 66.0 21.0 8.7 3.5 3.3 0.1
Tab.2 Comparison of gas composition in and out of discharge tube at 600 ℃
Fig.5 Influence of H2 volume fraction on pyrolysis gas discharge at different temperatures
气氛组别 φB/%
CH4 H2 CO CO2 N2
入口 40.0 40.0 8.8 6.4 4.0
出口 44.3 38.1 12.4 4.85 3.6
Tab.3 Comparison of gas composition in and out of discharge tube with high H2 volume fraction atmosphere
Fig.6 Growth of carbon filament with low H2 volume fraction atmosphere
Fig.7 Influence of CO volume fraction on pyrolysis gas discharge at different temperatures
Fig.8 Comparison of CO discharge characteristics at 20 ℃ and 600 ℃
Fig.9 Influence of CO2volume fraction on pyrolysis gas discharge at different temperatures
Fig.10 Influence of N2volume fraction on pyrolysis gas discharge at different temperatures
Fig.11 Optimization effect of atmosphere conditioning on pyrolysis gas discharge
气氛
组别 		φB/%
H2O 标准煤气
调质煤气1 10 90
调质煤气2 30 70
调质煤气3 50 50
Tab.4 Composition of tempered pyrolysis gas
Fig.12 Influence of H2O volume fraction on pyrolysis gas discharge at different temperatures
Fig.13 Influence of positive power on discharge of pyrolysis gas at 400 ℃ and 600 ℃
Fig.14 Influence of positive power on discharge of high CH4pyrolysis gas at 400 ℃ and 600 ℃
Fig.15 Influence of positive power on discharge of tempered pyrolysis gas 3 at 600 ℃
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