Decomposition of carbon dioxide via dielectric barrier discharge microplasma

doi:10.11949/0438-1157.20211344

Abstract

Abstract:

Carbon dioxide is not only one of the main greenhouse gases, but also a resource containing carbon and oxygen. Converting relatively inert CO₂ into easy-to-use CO is one of its utilization methods. The effects of reactor parameters (discharge zone length, discharge spacing, and dielectric thickness) and process parameters (input power, discharge frequency and residence time) on the conversion and energy efficiency of CO₂ decomposition into CO were investigated with a dielectric barrier microplasma reactor. The results indicated that the order of affecting CO₂ conversion is: discharge spacing > discharge length > input power ≈ residence time > dielectric thickness > discharge frequency. When the input power was 60.0 W, the discharge frequency was 9.0 kHz and the residence time was 1.5 s, the discharge area length was 60 mm, the discharge spacing was 0.5 m and the dielectric thickness was 1.6 mm, the CO₂ conversion was 10.6% and the energy efficiency was 4.1%.

Key words: carbon dioxide, microchannels, carbon monoxide, dielectric barrier discharge, plasma, decomposition

摘要：

二氧化碳既是主要的温室气体之一，也是包含碳和氧的资源，把相对惰性的CO₂转化为易于利用的CO是其利用的方法之一。采用介质阻挡微等离子体反应器通过单变量和正交实验探究了反应器参数(放电区长度、放电间距、介质厚度)和工艺参数(输入功率、放电频率和停留时间)对CO₂分解为CO的转化率和能量效率的影响规律。研究结果表明，影响CO₂转化率的大小顺序依次为：放电间距>放电长度>输入功率≈停留时间>介质厚度>放电频率；输入功率60.0 W、放电频率9.0 kHz和停留时间1.5 s、放电区长度60 mm、放电间距0.5 m、介质厚度1.6 mm时，CO₂的转化率为10.6%，能量效率为4.1%。

关键词: 二氧化碳, 微通道, 一氧化碳, 介质阻挡放电, 等离子体, 分解

CLC Number:

O 646.9

Xiaoxi WANG, Xiaoyan LI, Baowei WANG. Decomposition of carbon dioxide via dielectric barrier discharge microplasma[J]. CIESC Journal, 2022, 73(3): 1343-1350.

王小西, 李笑艳, 王保伟. 介质阻挡放电微等离子体分解二氧化碳研究[J]. 化工学报, 2022, 73(3): 1343-1350.

Figures/Tables 13

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水平	因素
水平	输入功率/W	放电间距/mm	放电频率/kHz	停留时间/s	放电长度/mm	介质厚度/mm
1	40.0	1.0	8.0	1.5	100	1.0
2	50.0	0.8	9.0	2.5	80	1.6
3	60.0	0.5	10.0	3.5	60	2.1

水平	因素
水平	输入功率/W	放电间距/mm	放电频率/kHz	停留时间/s	放电长度/mm	介质厚度/mm
1	40.0	1.0	8.0	1.5	100	1.0
2	50.0	0.8	9.0	2.5	80	1.6
3	60.0	0.5	10.0	3.5	60	2.1

序号	A	B	C	空白	D	E	F	χ_CO2/%
1	1	1	1	1	1	1	1	5.6
2	1	2	2	2	2	2	2	7.1
3	1	3	3	3	3	3	3	8.5
4	2	1	1	2	2	3	3	7.7
5	2	2	2	3	3	1	1	7.3
6	2	3	3	1	1	2	2	8.7
7	3	1	2	1	3	2	3	7.9
8	3	2	3	2	1	3	1	9.3
9	3	3	1	3	2	1	2	8.3
10	1	1	3	3	2	2	1	4.9
11	1	2	1	1	3	3	2	7.4
12	1	3	2	2	1	1	3	6.9
13	2	1	2	3	1	3	2	8.2
14	2	2	3	1	2	1	3	6.1
15	2	3	1	2	3	2	1	9.6
16	3	1	3	2	3	1	2	7.5
17	3	2	1	3	1	2	3	6.6
18	3	3	2	1	2	3	1	9.1
K₁	30.381	26.895	35.691	35.019	31.674	31.53	33.549
K₂	36.576	30.444	36.06	34.665	34.326	33.126	37.77
K₃	37.005	46.62	32.211	34.275	37.959	39.306	32.64
K₁	10.127	8.965	11.897	11.673	10.558	10.51	11.183
K₂	12.192	10.148	12.02	11.555	11.442	11.042	12.59
K₃	12.335	15.54	10.737	11.425	12.653	13.102	10.88
R₁	2.208	6.575	1.283	0.248	2.095	2.592	1.71

序号	A	B	C	空白	D	E	F	χ_CO2/%
1	1	1	1	1	1	1	1	5.6
2	1	2	2	2	2	2	2	7.1
3	1	3	3	3	3	3	3	8.5
4	2	1	1	2	2	3	3	7.7
5	2	2	2	3	3	1	1	7.3
6	2	3	3	1	1	2	2	8.7
7	3	1	2	1	3	2	3	7.9
8	3	2	3	2	1	3	1	9.3
9	3	3	1	3	2	1	2	8.3
10	1	1	3	3	2	2	1	4.9
11	1	2	1	1	3	3	2	7.4
12	1	3	2	2	1	1	3	6.9
13	2	1	2	3	1	3	2	8.2
14	2	2	3	1	2	1	3	6.1
15	2	3	1	2	3	2	1	9.6
16	3	1	3	2	3	1	2	7.5
17	3	2	1	3	1	2	3	6.6
18	3	3	2	1	2	3	1	9.1
K₁	30.381	26.895	35.691	35.019	31.674	31.53	33.549
K₂	36.576	30.444	36.06	34.665	34.326	33.126	37.77
K₃	37.005	46.62	32.211	34.275	37.959	39.306	32.64
K₁	10.127	8.965	11.897	11.673	10.558	10.51	11.183
K₂	12.192	10.148	12.02	11.555	11.442	11.042	12.59
K₃	12.335	15.54	10.737	11.425	12.653	13.102	10.88
R₁	2.208	6.575	1.283	0.248	2.095	2.592	1.71

参数	局部方差总和	自由度	方差比	F临界值	重要性
输入功率	18.323	2	99.043	99	*
放电间距	147.402	2	796.768	99	*
放电频率	6.016	2	32.519	99
停留时间	13.275	2	71.757	99
放电长度	22.486	2	121.546	99	*
介质厚度	9.99	2	54	99
误差	0.18	2	—	—