TDLAS-based synchronous on-line measurement of CO/H<sub>2</sub>S near water wall of a pulverized coal boiler

PENG Zhimin; HE Shuanling; ZHOU Peili; DU Yanjun; WANG Zhen; DING Yanjun; WU Yuxin; LYU Junfu

doi:10.19666/j.rlfd.202204064

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TDLAS-based synchronous on-line measurement of CO/H₂S near water wall of a pulverized coal boiler

Thermal Power Generation Vol. 51, Issue 10, Pages: 145-152(2022)

更新时间：2025-09-28

- TDLAS-based synchronous on-line measurement of CO/H₂S near water wall of a pulverized coal boiler
- 作者机构：
  
  1. 清华大学能源与动力工程系
  2. 华北电力大学控制与计算机工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202204064
  CLC： TM621.2
- Published：2022
- 稿件说明：
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PENG Zhimin, HE Shuanling, ZHOU Peili, et al. TDLAS-based synchronous on-line measurement of CO/H₂S near water wall of a pulverized coal boiler[J]. Thermal Power Generation, 2022, 51(10): 145-152.
DOI：

PENG Zhimin, HE Shuanling, ZHOU Peili, et al. TDLAS-based synchronous on-line measurement of CO/H₂S near water wall of a pulverized coal boiler[J]. Thermal Power Generation, 2022, 51(10): 145-152. DOI： 10.19666/j.rlfd.202204064.

摘要

煤粉锅炉低氮燃烧工况下还原性气氛H_2S和CO体积分数上升导致水冷壁高温腐蚀严重，实时在线监测水冷壁近壁面CO/H_2S体积分数并基于测得的数据建立高温腐蚀预警模型具有重要意义。采用可调谐二极管激光吸收光谱（TDLAS）技术测量锅炉水冷壁近壁面CO/H_2S体积分数，首先利用赫里奥特多次反射池提高测量精度并降低检测限，然后开展CO/H_2S体积分数动态测量验证实验。结果表明，CO、H_2S分别在0～2 000μL/L和0～20μL/L范围内，测量值与配比值一致且具有较高的精度。最后结合恒流稀释烟气高保真预处理技术将研制的CO/H_2S监测装置应用于大型火电机组煤粉锅炉现场，采用轮测方式实现了锅炉炉膛“还原区”和“燃尽区”CO/H_2S同步在线监测；同时基于监测数据反馈对锅炉燃烧进行调整，在确保烟气超低排放基础上减缓水冷壁高温腐蚀速率，实现火电机组高效、环保、安全和智能化运行。

Abstract

The increase of CO and H_2S volume fraction leads to severe high-temperature corrosion of water wall of pulverized coal boiler under low nitrogen concentration combustion condition.Therefore

it is of great significance to monitor the volume fraction of CO and H_2S on near-wall surface in real time and establish an early warning model for high-temperature corrosion based on the measured data.In this work

the tunable diode laser absorption(TDLAS) technology was used to measure the volume fraction of CO and H_2S near the boiler water wall.Firstly

Herriot multiple reflection cell was used to improve the measurement accuracy and reduce the detection limit.Then the dynamic measurement of CO/H_2S volume fraction was carried out to verify the proposed experimental approach.Preliminary results showed that the measured CO and H_2S volume fractions agree very well with the preset values in the range of 0 to 2 000μL/L and 0 to 20μL/L respectively with high measurement accuracy.Finally

combined with the high-fidelity pretreatment technology of flue gas based on the principle of constant-flow dilution

the developed CO/H_2S monitoring device was applied to the field of pulverized coal boiler in large thermal power units.The alternating measurement strategy was applied to realize synchronous on-line monitoring of CO/H_2S in both “reducing zone” and “burnout zone” of boiler furnace.Based on the monitoring date

the boiler combustion was further adjusted to slow down the high-temperature corrosion rate of the water wall while ensuring ultra-low emission from flue gas.Eventually

the efficient

environmentally friendly

safe and intelligent operation of thermal power unit was realized.

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TDLAS-based synchronous on-line measurement of CO/H2S near water wall of a pulverized coal boiler

DOI：10.19666/j.rlfd.202204064

摘要

Abstract

关键词

Keywords

references

TDLAS-based synchronous on-line measurement of CO/H₂S near water wall of a pulverized coal boiler