一种三氧化硫标准气体发生装置的研制

邓建国; 王东滨; 蒋靖坤

doi:10.13205/j.hjgc.202409025

一种三氧化硫标准气体发生装置的研制

doi: 10.13205/j.hjgc.202409025

1. 清华大学环境学院, 北京 100084;
2. 国家环境保护大气复合污染来源与控制重点实验室, 北京 100084

基金项目:

国家重点研发计划“固定污染源超低排放高精度监测与质控技术”(2022YFC3700502)

详细信息

作者简介:
邓建国(1985-),男,硕士,主要研究方向为污染源颗粒物排放。fengxing.luotuo@163.com

通讯作者:
蒋靖坤(1980-),男,博士生导师,主要研究方向为大气污染控制。jiangjk@tsinghua.edu.cn

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出版历程
- 收稿日期: 2024-07-12
- 网络出版日期: 2024-12-02

DEVELOPMENT OF A STANDARD GAS GENERATOR FOR SO₃

1. School of Environment, Tsinghua University, Beijing 100084, China;
2. State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China

摘要

摘要: 烟气中三氧化硫(SO₃)是固定源可凝结颗粒物的主要气态前体物之一,排入大气环境后可形成“蓝烟”,具有较强的腐蚀性和环境毒性。目前监测烟气中SO₃的方法有多种,测量结果差异较大、准确性较难评判,需要对SO₃监测设备进行定期标定。但由于SO₃反应活性高、难以稳定保存,导致缺少标气,这大大限制了SO₃测量的准确性。研制了基于催化氧化SO₂生成SO₃的便携式标气发生装置,并对其SO₃的产率、稳定性及其影响因素进行了评测。结果表明:在填装600 mg钒催化剂(40~60目),持续通入0.1 L/min、1000 ppm(μmol/mol)的SO₂气体,催化温度430 ℃的条件下,SO₂转化效率为98.5%。用洁净零空气按一定比例对高浓度SO₃气体进行稀释混合,可线性输出浓度范围10~1000 ppm的SO₃标气,用于SO₃监测设备的标定和质控。
- 固定源 /
- 三氧化硫 /
- 标气发生装置 /
- 标定 /
- 可凝结颗粒物
Abstract: SO₃ is one of the most important precursors of condensable particulate matter, and easily transferred into blue flue gas after emission, which causes adverse effects on the atmospheric environment. SO₃ is also corrosive and hazardous gas. It is necessary to measure and monitor its concentration in flue gas. At present, the results and accuracy for methods monitoring SO₃ in flue gas are difficult to judge and equipments need to be calibrated regularly. However, SO₃ is reactive and difficult to store in the tank and must be generated on-site. The lack of ready-made standard gas is the major limiting factor for accurate measurement and monitoring of SO₃. In this paper, a SO₃ generator was developed based on the principle of catalytic oxidation. Its performance, stability, and influencing factors were evaluated. The conversion ratio was stable at 98.5% on the condition that injecting 1000 ppm(μmol/mol) SO₂ at a flow rate of 0.1 L/min, loading 600 mg vanadium catalysts (40~60 mesi), and setting the conversion temperature at 430 ℃. By diluting the highly-concentrated SO₃ with clean air of different flow rates, the generator linearly outputs SO₃ standard gas in the range of 10 ppm to 1000 ppm, which can be used for calibration of measurement and monitoring of SO₃.
- stationary source /
- SO₃ /
- standard gas generator /
- calibration /
- condensable particulate matter

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