Effect of limestone desulfurization on N<sub>2</sub>O emission in CFB boiler fieldtest

MIAO Miao; KONG Hao; DENG Boyu; ZHU Shahong; ZHANG Man; YANG Hairui

doi:10.19666/j.rlfd.202002047

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Effect of limestone desulfurization on N₂O emission in CFB boiler fieldtest

更新时间：2025-09-28

- Effect of limestone desulfurization on N₂O emission in CFB boiler fieldtest
- Thermal Power Generation Vol. 49, Issue 6, Pages: 1-6(2020)
- 作者机构：
  
  清华大学能源与动力工程系电力系统及发电设备控制和仿真国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202002047
  CLC： TK229.66
- Published Online：24 May 2020，
  
  Published：2020
- 稿件说明：
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MIAO Miao, KONG Hao, DENG Boyu, et al. Effect of limestone desulfurization on N₂O emission in CFB boiler fieldtest[J]. Thermal power generation, 2020, 49(6): 1-6.
DOI：

MIAO Miao, KONG Hao, DENG Boyu, et al. Effect of limestone desulfurization on N₂O emission in CFB boiler fieldtest[J]. Thermal power generation, 2020, 49(6): 1-6. DOI： 10.19666/j.rlfd.202002047.

摘要

以往对于石灰石脱硫过程中N_2O排放特性的研究多集中在机理和实验室研究方面

在现场进行实际测量的数据较少。为了探索现场试验中石灰石脱硫对循环流化床(CFB)中N_2O排放的影响

测量和分析了某150 MW CFB锅炉不同负荷下炉内石灰石脱硫对烟气中SO_2、N_2O和NO_x的影响规律。结果表明:投入石灰石后

SO_2排放质量浓度在短时间内从1 200 mg/m~3下降到100 mg/m~3以下;石灰石以一定速率给入时

N_2O排放质量浓度会一定程度地降低

这与CaO对N_2O的热催化作用相关

但NO_x排放质量浓度显著升高

呈现此消彼长趋势;随着锅炉负荷的升高

N_2O排放质量浓度整体出现下降趋势。在CFB的燃烧温度范围内

N_2O可能取代NO_x作为主要的氮氧化物污染物来源。

Abstract

Researches on N_2O emission characteristics in limestone desulfurization process in the past few years mainly focused on mechanism and laboratory research

while the data measured in the field was rare.In order to explore the influence of limestone desulfurization on N_2O emission mass concentration in circulating fluidized bed(CFB) fieldtest

the variation trend of SO_2

N_2O and NOx in flue gas of boiler at different loads was comprehensively measured and analyzed after limestone was put into the 150 MW CFB unit for desulfurization.The results show that

the SO_2 emission mass concentration reduced from 1 200 mg/m~3 to below 100 mg/m~3 in a short time.When the limestone was fed at a certain rate

the N_2O emission mass concentration decreased to some extent

which was related to the catalytic effect of CaO on the thermal decomposition of N_2O.However

the NOx emission mass concentration increased significantly.With the increase of boiler load

the N_2O emission mass concentration decreased as a whole.Within the combustion temperature range of CFB boilers

N_2O is likely to replace NOx as the main source of pollutants.

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Effect of limestone desulfurization on N2O emission in CFB boiler fieldtest

DOI：10.19666/j.rlfd.202002047

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Effect of limestone desulfurization on N₂O emission in CFB boiler fieldtest