Effects of hydrogen peroxide, sodium carbonate, and ethanol additives on the urea-based SNCR process

被引：24
作者：
Cai, Jianjun [1 ]
Zheng, Wenheng [1 ]
Wang, Quan [1 ]
机构：
[1] Guilin Univ Elect Technol, Sch Architecture & Traff, Guilin 541004, Peoples R China
来源：
SCIENCE OF THE TOTAL ENVIRONMENT | 2021年 / 772卷
基金：
中国国家自然科学基金;
关键词：
NOx emission; SNCR; Additives; Secondary pollutant; Ammonia leakage;
D O I：
10.1016/j.scitotenv.2021.145551
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The issue of secondary pollutants represents a classic problem in the urea-based selective non-catalytic reduction (SNCR) process. Therefore, this study took to investigate the evolutions of secondary pollutants when including additives during the urea-based SNCR process. Results indicated that additives, namely hydrogen peroxide, sodium carbonate, and ethanol, clear improved denitration efficiency between 750 degrees C - 925 degrees C due to the increase of OH groups. Compared to rates without any additives, the "temperature window" width of hydrogen peroxide, sodium carbonate, and ethanol increased by 30%, 30%, and 52%, respectively. The temperature at the maximum denitration efficiency was decreased by 25 degrees C with the addition of ethanol. The addition of hydrogen peroxide, sodium carbonate, and ethanol decreased the amount of ammonia leakage at 725 - 900 degrees C. Besides, the emissions of HNCO and N2O were decreased by adding sodium carbonate during 725 degrees C - 900 degrees C. Therefore, the addition of sodium carbonate proved to be beneficial for reducing the secondary pollutant emissions in SNCR. This study aims to provide a deeper understanding of the urea-based SNCR process in combustion. (C) 2021 Elsevier B.V. AB rights reserved.
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页数：8
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