| 可凝结颗粒物采样系统的优化设计及实测应用 |
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| 引用本文： | 沈志刚, 李冠华, 刘泽宇, 义超. 可凝结颗粒物采样系统的优化设计及实测应用[J]. 环境工程学报, 2021, 15(10): 3262-3269. doi: 10.12030/j.cjee.202010034 |
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| 作者姓名： | 沈志刚 李冠华 刘泽宇 义超 |
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| 作者单位： | 上海创蓝检测技术有限公司, 上海 200233 |
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| 基金项目： | 国家重点研发计划课题(2016YFC0203701) |
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| 摘 要： | 燃煤电厂烟气中可凝结颗粒物(CPM)主要由无机成分组成，其排放会影响大气环境。为有效捕集烟气中CPM并研究其无机组分排放特性，采用自主优化设计的CPM采样装置，就国家大气污染防治重点区域内3台600 MW等级以上超低排放燃煤机组开展了烟气中CPM实测研究，同时对采样装置的有效性、可靠性进行了探讨。该装置利用半导体材料进行制冷，与常规采样装置相比体积轻巧、便于携带、捕集效率高、冷凝效果好，且使用成本低。研究结果表明：燃煤电厂中A、B、C 3个机组烟囱排口的CPM质量浓度分别为2.22、3.02、3.83 mg·m−3；CPM无机水溶性离子中，阴离子主要有SO42−、Cl−等，阳离子主要有Ca2+、Na+、NH4+等；其中，SO42−质量浓度占比均大于50%，在水蒸气存在的情况下，会与NH4+产生硫酸氢铵和硫酸铵；而硫酸氢铵易与烟气中的水蒸气结合形成酸雾，会腐蚀烟气管道，还会因其黏附性较强附着飞灰等杂质在管道表面沉积附着，加剧管道的腐蚀和结垢。本研究结果可为探究超低排放燃煤电厂烟气中CPM的排放特性提供参考。
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| 关 键 词： | 燃煤电厂烟气 可凝结颗粒物 半导体制冷 排放特性 |
| 收稿时间： | 2020-10-10 |
Optimal design and determination study of condensable particulate matter sampling system |
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| SHEN Zhigang, LI Guanhua, LIU Zeyu, YI Chao. Optimal design and determination study of condensable particulate matter sampling system[J]. Chinese Journal of Environmental Engineering, 2021, 15(10): 3262-3269. doi: 10.12030/j.cjee.202010034 |
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| Authors: | SHEN Zhigang LI Guanhua LIU Zeyu YI Chao |
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| Affiliation: | Shanghai Chuanglan Testing Technology Co., Ltd, Shanghai 200233, China |
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| Abstract: | The environmental impact of the Condensable Particulate Matter (CPM) emission, in flue gas, from coal-fired power plants is innegligible. However, the CPM collection methods existed are not well suited to the actual situation of the fixed stationary source within the country. Inorganic component is the main component of CPM. In order to capture CPM in flue gas effectively and study its inorganic components emission characteristics, we adopted the self-designed CPM sampling device to carry out the CPM measurement research in flue gas, and at the same time, the effectiveness and reliability of this CPM sampling device are discussed. The test objects are three ultra-low emission coal-fired power plants in the national key field of air pollution prevention and control. The CPM sampling device uses semiconductor materials for refrigeration, which has light in size, easy to carry, high collecting efficiency, good condensation effect, and low cost compared with the conventional sampling device. The study shows that the CPM concentration at the chimneys of A, B and C coal-fired power plants is 2.22, 3.02 and 3.83 mg·m−3. The anions in CPM inorganic water-soluble ions, are mainly SO42− and Cl−, while the cations are mainly Ca2+, Na+ and NH4+. The mass concentration of SO42− accounts for more than 50%. In the presence of SO42−, ammonium hydrogen sulfate and ammonium sulfate will be produced when the water vapor is present with NH4+. Ammonium hydroxide is easy to combine with the water vapor in the flue gas to form acid mist, which will not only cause corrosion to the flue gas pipeline, but also fly ash and other impurities because of its strong adhesion. The deposition and attachment on the surface of the pipeline will aggravate the corrosion and scaling of the pipeline. Therefore, it is of great significance to study the effective capture and emission characteristics of CPM in coal-fired power plants. |
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| Keywords: | flue gas from coal-fired power plants condensable particulate matter semiconductor refrigeration emission characteristics |
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