Destruction of Toluene, Naphthalene and Phenanthrene as Model Tar Compounds in a Modified Rotating Gliding Arc Discharge Reactor
Destruction of Toluene, Naphthalene and Phenanthrene as Model Tar Compounds in a Modified Rotating Gliding Arc Discharge Reactor
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改进的旋转滑动电弧放电反应器中作为模型焦油化合物的甲苯、萘和菲的破坏
DOI：
10.3390/catal9010019
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发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Yan, Jianhua
中科院分区：
文献类型：
--
作者：
Kong, Xiangzhi;Zhang, Hao;Yan, Jianhua
焦油脱除是商业气化技术面临的最大技术挑战之一。为了寻找一种有效的等离子体裂解焦油的方法，本研究采用装有扇形旋流发生器的旋转滑动弧(RGA)放电反应器进行焦油裂解的模型研究。甲苯、萘和菲的溶液被用作焦油替代品，并在湿氮中被破坏。重点研究了焦油、二氧化碳和水分浓度以及放电电流对破坏效率的影响。此外，还考察了Ni/γ-Al_2O_3催化剂与等离子体的组合对等离子体催化裂解焦油的影响。在焦油含量为12g/Nm~3、水分含量为12%、二氧化碳含量为15%、流量为6nL/min的条件下，甲苯、萘和菲的脱除效率分别达到95.2%、88.9%和83.9%，能量效率为9.3g/kW·h。放电电流的增大有利于减少黑碳的产生。Ni/γ-Al_2O_3催化剂的加入显著提高了催化剂的破坏效率，特别是在较高的流速下(大于9nL/m in)。液体副产物主要有苯乙炔、吲哚、榄烯和荧菲。前者主要由甲苯转化，后者由甲苯和萘在等离子体中共反应生成，荧菲主要由菲转化。
Tar removal is one of the greatest technical challenges of commercial gasification technologies. To find an efficient way to destroy tar with plasma, a rotating gliding arc (RGA) discharge reactor equipped with a fan-shaped swirling generator was used for model tar destruction in this study. The solution of toluene, naphthalene and phenanthrene is used as a tar surrogate and is destroyed in humid nitrogen. The influence of tar, CO2 and moisture concentrations, and the discharge current on the destruction efficiency is emphasized. In addition, the combination of Ni/γ-Al2O3 catalyst with plasma was tested for plasma catalytic tar destruction. The toluene, naphthalene and phenanthrene destruction efficiency reached up to 95.2%, 88.9%, and 83.9% respectively, with a content of 12 g/Nm3 tar, 12% moisture, 15% CO2, and a flow rate of 6 NL/min, whereas 9.3 g/kW·h energy efficiency was achieved. The increase of discharge current is advantageous in terms of decreasing black carbon production. The participation of Ni/γ-Al2O3 catalyst shows considerable improvement in destruction efficiency, especially at a relatively high flow rate (over 9 NL/min). The major liquid by-products are phenylethyne, indene, acenaphthylene and fluoranthene. The first two are majorly converted from toluene, acenaphthylene is produced by the co-reaction of toluene and naphthalene in the plasma, and fluoranthene is converted by phenanthrene.