Development of an FDM-TDLAS Sensor for Long-Term Online Monitoring of H<sub>2</sub>S and CO to Predict Water Wall Corrosion Trends
A laser sensor system was developed to be employed in power plants and specifically engineered for high-particulate and high-temperature environments to be applicable for the online monitoring of hydrogen sulfide (H<sub>2</sub>S) and carbon monoxide (CO) near the furnace water wall. The system was designed based on frequency division multiplexing (FDM) and tunable diode laser absorption spectroscopy (TDLAS). A corrosion-resistant Herriott multipass cell was designed to withstand temperatures of up to 120 °C while providing an 18 m optical path length. The sensor system exhibits measurement uncertainties below 1.5% and 2% under mechanical vibration testing and thermal cycling testing. Allan variance analysis revealed minimum detection limits of 111 ppb for H<sub>2</sub>S and 116 ppb for CO, achievable at integration times of 178 and 144 s, respectively. Long-term field validation in a coal-fired boiler included multipoint sampling to assess the sensor system performance, simultaneously analyzing water-wall combustion dynamics and evaluating corrosion propensity.
Authors
- Zhijin Shang
- Houzhang Tan
- Guqing Guo (ORCID: https://orcid.org/0000-0001-6857-130X)
- Gang Xie (ORCID: https://orcid.org/0000-0001-5769-0565)
- Songjie Guo
- Chuanliang Li (ORCID: https://orcid.org/0000-0003-4831-7130)
- György Tarczay (ORCID: https://orcid.org/0000-0002-2345-1774)
- Milán Szöri (ORCID: https://orcid.org/0000-0003-4895-0999)
- Xiaocong Sun (ORCID: https://orcid.org/0000-0001-6460-7336)
- Béla Fiser (ORCID: https://orcid.org/0000-0003-0603-4626)
- Long Li (ORCID: https://orcid.org/0000-0001-9535-8977)
- Xiaohe Xiong
- Yali Tian (ORCID: https://orcid.org/0000-0003-4569-9591)
- Ting Gong
- Xuanbing Qiu (ORCID: https://orcid.org/0000-0002-4271-4648)
- Christa Fittshen
Institutions
- Eötvös Loránd University (HU)
- University of Miskolc (HU)
- Université de Lille (FR)
- University of Łódź (PL)
- PhysicoChimie des Processus de Combustion et de l'Atmosphère (FR)
- Taiyuan University of Science and Technology (CN)
- Xi'an Jiaotong University (CN)
Publication Details
- Journal
- Analytical Chemistry
- Published
- 2025-06-17
- DOI
- https://doi.org/10.1021/acs.analchem.5c02691
- Citations
- 9
- Primary Topic
- Spectroscopy and Laser Applications
- Type
- article
- Field-Weighted Citation Impact
- 6.81
Funders
- National Natural Science Foundation of China
- Shanxi Scholarship Council of China
- Hungarian Scientific Research Fund
- Nemzeti Kutatási Fejlesztési és Innovációs Hivatal
- Program for the Scientific Activities of Selected Returned Overseas Professionals in Shaanxi Province
- International Science and Technology Cooperation Program of Shanxi Province
- Science and Technology Innovation Group of Shanxi Province
- National Key Research and Development Program of China
- Shanxi Provincial Key Research and Development Project