Characteristics of selective non-catalytic reduction of NOx with solid polymer denitration agent

被引：0

作者：

Zhu C. ^{[1
,2
]}

Ru J. ^{[1
]}

Sun T. ^{[1
]}

Xie X. ^{[1
]}

Li C. ^{[3
]}

Gao S. ^{[2
]}

机构：

[1] Everbright Environmental Technology (China) Co., Ltd., Incineration Technology Research Institute, Jiangsu, Nanjing

[2] State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, CAS, Beijing

[3] School of Ecology and Environment, Beijing Technology and Business University, Beijing

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 09期

关键词：

denitration efficiency; polymer non-catalytic reduction (PNCR); polymers; reduction; selectivity;

D O I：

10.16085/j.issn.1000-6613.2022-1997

中图分类号：

学科分类号：

摘要：

The denitration efficiency, influencing factors and reaction mechanism of selective non-catalytic reduction of NOx with solid polymer denitration agent (PNCR) were explored in a fluidized bed reactor. The results showed that the denitration using solid denitration agent was mainly a non-catalytic reduction reaction. As temperature increased from 850℃ to 1150℃, the denitration efficiency increased with temperature, with the highest denitration efficiency of 97% at 950℃, and then the denitration efficiency decreased due to the high-temperature oxidation. The reaction did not need the oxygen and the denitration efficiency gradually decreased as the oxygen concentration increased. Steam addition could weaken the oxidation of denitration agent by O2 and delay the high-temperature oxidation reaction. In the thermal decomposition of solid denitration agent, O element mainly escaped in the form of CO2. And N and C elements were converted into active free radicals such as NH, CH2 and CN. CH2 and CN could react and thus consumed the strong oxidizing groups (e. g., O2, O and OH) in the furnace, and inhibit the formation of NO, which might further accelerate the reduction reaction of NH and other free radicals with NO to achieve high denitration efficiency. The research results could provide theoretical support and technical reference for the applications of polymer denitration technology. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：4939 / 4946

页数：7

共 27 条

[21] LYU Hongkun, YANG Weijuan, ZHOU Junhu, Et al., Investigation on effects of water vapor on selective non-catalytic reduction of NOx, Proceedings of the CSEE, 30, 14, pp. 50-55, (2010)
[22] ZHU Chuanqiang, HU Lihua, SHEN Hongwei, Et al., Experimental study on selective non-catalytic reduction (SNCR) in domestic waste incineration, Journal of Engineering Thermophysics, 41, 8, pp. 2089-2095, (2020)
[23] MILLER J A, BOWMAN C T., Mechanism and modeling of nitrogen chemistry in combustion, Progress in Energy and Combustion Science, 15, 4, pp. 287-338, (1989)
[24] ZHU Chuanqiang, LIU Shuyuan, YU Jian, Et al., NOx emission characteristics of high-N fuel combustion in atmospheres rich in O2 and steam, CIESC Journal, 70, 3, pp. 1048-1055, (2019)
[25] SCHABER P, COLSON J, HIGGINS S, Et al., Study of the urea thermal decomposition (pyrolysis) reaction and importance to cyanuric acid producition, American Laboratory, 31, 16, pp. 13-21, (1999)
[26] LYU Hongkun, YANG Weijuan, ZHOU Junhu, Et al., Investigation on thermal decomposition characteristics of urea solution under high temperature, Proceedings of the CSEE, 30, 17, pp. 35-40, (2010)
[27] JOHNSSON J E., Formation and reduction of nitrogen oxides in fluidized-bed combustion, Fuel, 73, 9, pp. 1398-1415, (1994)

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