Rreason analysis on deviation of online flue gas NOx concentration measurement

SONG Xiaohong1; YAN Weiming1; TAO Zhiguo1; ZHANG Yang1; WEN Liang2 1.Hebei Electric Power Research Institute

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Rreason analysis on deviation of online flue gas NOx concentration measurement

Thermal Power Generation Vol. 42, Issue 2, Pages: 86-88(2013)

更新时间：2025-09-28

- Rreason analysis on deviation of online flue gas NOx concentration measurement
- 作者机构：
  
  1. 河北省电力公司电力科学研究院
  2. 神华河北国华定洲发电有限责任公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： X831
- Published：2013
- 稿件说明：
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SONG Xiaohong1, YAN Weiming1, TAO Zhiguo1, et al. Rreason analysis on deviation of online flue gas NOx concentration measurement[J]. Thermal Power Generation, 2013, 42(2): 86-88.
DOI：

SONG Xiaohong1, YAN Weiming1, TAO Zhiguo1, et al. Rreason analysis on deviation of online flue gas NOx concentration measurement[J]. Thermal Power Generation, 2013, 42(2): 86-88. DOI：

摘要

对某电厂烟气脱硝与脱硫系统4台烟气在线连续监测分析仪(CEMS)之间氮氧化物浓度测量偏差原因进行了分析

认为其原因是由于烟气中氮氧化物浓度过低

在线仪表在进行低浓度测量时仪器误差较大

以及脱硝系统出口烟道氮氧化物浓度不均

在线仪表测点不具代表性所致。为此

提出了合理布设导流板、调整喷氨格栅、加装烟气扰流装置、采用接近实际烟气浓度的标准气体校准仪器等建议。

Abstract

Deviation exited between the four CEMS's measurement for NOx concentration in flue gas denitrification and desulfurization systems in a power plant

analysis showed that the reason was that due to the low NOx concentration in flue gas

the online instruments had large instrument error when measuring NOx with too low concentration.Moreover

NOx at the outlet of the denitrification system was not evenly distributed

causing the test points of the online instruments have no representativeness

which was another important reason.Thus

some suggestions were given

such as reasonably arranging the baffle

adjusting the ammonia injection grid

installing flue gas disturbance device and calibrating the analyzer with standard gas having concentration that is close to the actual gas's.

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