水分条件下碳黑氧化气体排放特性的实验研究

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摘要基于柴油机颗粒捕集器(DPF)再生时的颗粒氧化过程,采用固定床反应器研究水蒸气条件下不同温度(495~565℃)、水浓度(0~9%)、氧浓度(5%~21%)及催化剂对均匀堆积碳黑颗粒层氧化气体排放特性的影响,通过气体分析仪测试排放气体获得碳黑氧化过程的气体排放特性.实验结果表明:温度升高、氧浓度增加与加入催化剂均会促进碳黑氧化,且催化剂CeO₂或Pt/Al₂O₃可使得CO接近零排放.水蒸气加入会使二氧化碳CO₂及CO排放量降低,碳黑氧化效率下降,水蒸气的这种抑制作用在高氧浓度时更为明显.当水浓度由0%增加至9%,气体排放量和氧化效率先下降后上升,3%时抑制效果最强,最终CO₂排放有所增加.此外,碳黑氧化排放的CO₂/CO比值随温度升高而下降,氧浓度对该比值影响较小,而水浓度升高该比值逐渐增加.

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	孟忠伟
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关键词 ：碳黑颗粒层, 水蒸气, 催化剂, CO₂/CO, 气体排放

Abstract：Based on the particle oxidation process during the regeneration of Diesel Particulate Filter (DPF), the gas emission under different temperatures (495~565℃), water concentrations (0~9%), oxygen concentrations (5%~21%) and catalysts on the oxidation process of uniformly stacked carbon black particle layer were studied in a fixed bed reactor. Gas emissions were measured using a gas analyzer to obtain the emission characteristics of carbon black oxidation. The experimental results showed that increasing temperature, oxygen concentration and adding catalysts promoted the oxidation of carbon black, and CeO₂ or Pt/Al₂O₃ catalysts reduced CO near to zero. However, the addition of water vapor decreased the emissions of CO₂ and CO, as well as the oxidation efficiency. This inhibition effect was more pronounced at higher oxygen concentrations. When the water concentration increased from 0% to 9%, the gas emission and oxidation efficiency first decreased, then increased, with the strongest effect at 3%. Ultimately, the emission of CO₂ increased. In addition, the CO₂/CO ratio of carbon black oxidation emission decreased with an increase in temperature, with little effect by oxygen concentration. This ratio gradually increased with water concentration.

Key words： carbon black particles layer water vapor catalysts CO₂/CO gas emissions

收稿日期: 2022-12-15

PACS:

X701.7

基金资助:国家自然科学基金资助项目(52076182);四川省科技厅科技项目(2019YJ0594,2021YJ0332)

通讯作者: 孟忠伟,教授,mengzw@mail.xhu.edu.cn E-mail: mengzw@mail.xhu.edu.cn

作者简介: 孟忠伟(1980-),男,四川成都人,教授,博士,主要从事发动机后处理技术方面的研究.发表论文100余篇.22932958@qq.com

引用本文:

孟忠伟, 吴代庚, 黄俊峰, 蒋炎志. 水分条件下碳黑氧化气体排放特性的实验研究[J]. 中国环境科学, 2023, 43(7): 3360-3367. MENG Zhong-wei, WU Dai-geng, HUANG Jun-feng, JIANG Yan-zhi. Experimental study on gas emission characteristics of carbon black oxidation under water condition. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3360-3367.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I7/3360

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