Liquid-phase discharge plasma decomposition of methanol for hydrogen production: optimization of electrode configuration

doi:10.11949/0438-1157.20240289

Abstract

Abstract:

By utilizing liquid-phase array electrode gliding arc discharge plasma to decompose methanol, the existing hydrogen production technology was optimized, and the influence of different electrode configurations on hydrogen production performance was systematically studied. The optimal number of electrode configurations was obtained, and it was found that the maximum hydrogen flow rate of the 4-needle electrode reached 1188.54 ml/min at the same discharge power, which was 118% higher than that of the single needle. Furthermore, in the liquid-phase discharge, the array needle ring structure exhibited higher hydrogen production capacity and energy yield compared to the array needle hole-plate structure. When using the array needle-ring structure, the gliding arc discharge plasma decomposition of methanol demonstrated the best hydrogen production performance, with an energy yield of 69.75 g/kWh and an energy efficiency of 71.12%, which is better than most existing hydrogen production schemes.

Key words: liquid-phase discharge, plasma, methanol, hydrogen production, optimization

摘要：

利用液相阵列电极滑动弧放电等离子体分解甲醇来优化现有制氢技术，系统研究了不同电极配置对制氢性能的影响。获得最优极配数量，发现同放电功率下4针电极最大氢气流速达到1188.54 ml/min，相对于单针提高了118%。此外，在液相放电中阵列针-环结构相比阵列针-孔板结构具有更高的氢气产能和能量产率。在阵列针-环电极配置工况，滑动弧放电等离子体分解甲醇表现出最佳制氢性能，能量产率69.75 g/kWh，能量效率71.12%，优于现有大多数制氢方案。

关键词: 液相放电, 等离子体, 甲醇, 制氢, 优化

CLC Number:

TK 91

Junfeng WANG, Junjie ZHANG, Wei ZHANG, Jiale WANG, Shuyan SHUANG, Yadong ZHANG. Liquid-phase discharge plasma decomposition of methanol for hydrogen production: optimization of electrode configuration[J]. CIESC Journal, 2024, 75(9): 3277-3286.

王军锋, 张俊杰, 张伟, 王家乐, 双舒炎, 张亚栋. 液相放电等离子体分解甲醇制氢：电极配置的优化[J]. 化工学报, 2024, 75(9): 3277-3286.

Figures/Tables 11

Fig.1 Liquid-phase array electrode discharge plasma hydrogen production system

Fig.2 Photographs of liquid-phase array electrode discharge plasma

Fig.3 The voltage-current waveforms of different plasma modes

Fig.4 Effect of discharge power on gas flow rate and gas selectivity

Fig.5 Electrode erosion analysis：(a) SEM image; (b)—(d)EDS analysis

Fig.6 Effect of electrode spacing on gas flow rate

Fig.7 Effect of electrode spacing on gas selectivity

Table 1 Effect of electrode spacing on temperature variation

模式	d/mm	环电极		孔板电极
模式	d/mm	ΔT/℃	δ/%	ΔT/℃	δ/%
GAD	5	4.3±0.4	41.1	4.4±0.6	42.2
GAD	10	9.0±0.6	40.6	7.4±0.9	32.1
GD	15	16.9±0.8	42.3	20.1±0.7	54.5
	20	16.5±0.5	40.5	18.9±0.3	54.0
	25	19.8±0.7	46.9	21.2±0.5	59.1

Fig.8 Effect of cone angle on hydrogen production performance

Fig.9 Hydrogen production performance evaluation

Table 2 Comparison of hydrogen production performance by different methods

技术路线	原料	电极配置	$Q_{H_{2}}$ /(ml/min)	$S_{H_{2}}$ /%	EY/(g/kWh)	EE/%	文献
electrolysis	水	—	—	—	11.9~19.84	—	[37]
microwave	甲烷+水	—	2202.3	71.1	13.25	37.9	[38]
microwave	乙醇+水	—	17400	59.1	62.44	—	[14]
Laval nozzle arc	乙醇+水	—	2500	40	99.21	28	[16]
DBD	乙醇+水	—	48	58.2	12.32	—	[20]
AC discharge	甲醇+水	—	2780	约63	29.08	约42	[30]
GAD	甲烷+水	刀片式	135.27	72.2	16.47	28.8	[39]
GAD	甲醇+氮气	同轴针-筒	2252	53.1	34.54	约51	[40]
GAD	甲醇	针-环	567	62.58	55.8	55.1	[13]
GAD	甲醇	阵列针-环	1188.54	65.65	69.75	71.12	this work

Table 2 Comparison of hydrogen production performance by different methods

技术路线	原料	电极配置	$Q_{H_{2}}$ /(ml/min)	$S_{H_{2}}$ /%	EY/(g/kWh)	EE/%	文献
electrolysis	水	—	—	—	11.9~19.84	—	[37]
microwave	甲烷+水	—	2202.3	71.1	13.25	37.9	[38]
microwave	乙醇+水	—	17400	59.1	62.44	—	[14]
Laval nozzle arc	乙醇+水	—	2500	40	99.21	28	[16]
DBD	乙醇+水	—	48	58.2	12.32	—	[20]
AC discharge	甲醇+水	—	2780	约63	29.08	约42	[30]
GAD	甲烷+水	刀片式	135.27	72.2	16.47	28.8	[39]
GAD	甲醇+氮气	同轴针-筒	2252	53.1	34.54	约51	[40]
GAD	甲醇	针-环	567	62.58	55.8	55.1	[13]
GAD	甲醇	阵列针-环	1188.54	65.65	69.75	71.12	this work

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