高硫低温高灰烟气环境中SO3的行为研究

doi:10.11930/j.issn.1004-9649.201812024

中国电力 ›› 2019, Vol. 52 ›› Issue (3): 23-28.DOI: 10.11930/j.issn.1004-9649.201812024

高硫低温高灰烟气环境中SO₃的行为研究

张知翔¹, 李楠¹, 邹小刚¹, 苏林², 李文锋¹, 李卫涛¹, 韩键平¹, 徐党旗¹

1. 西安热工研究院有限公司, 陕西西安 710054;
2. 华能重庆珞璜发电有限责任公司重庆 402283

收稿日期:2018-12-10 修回日期:2019-01-25 出版日期:2019-03-05 发布日期:2019-03-27
作者简介:张知翔(1986-),男,硕士,高级工程师,从事烟气余热利用和有色烟羽消除研究,E-mail:zhangzhixiang@tpri.com.cn

Study on the Behavior of Sulphur Trioxide in the High-Sulphur Low-Temperature and High-Ash Flue Gas Environment

ZHANG Zhixiang¹, LI Nan¹, ZOU Xiaogang¹, SU Lin², LI Wenfeng¹, LI Weitao¹, HAN Jianping¹, XU Dangqi¹

1. Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710054, China;
2. Huaneng Chongqing Luohuang Power Plant Co., Ltd., Chongqing 402283, China

Received:2018-12-10 Revised:2019-01-25 Online:2019-03-05 Published:2019-03-27

摘要/Abstract

摘要： 在高硫煤机组上抽取烟气搭建了低低温省煤器试验台，并在高硫低温高灰烟气环境下进行了SO₃协同脱除试验研究。试验结果表明：SO₃与SO₂浓度之比约为0.97%；高硫煤低低温省煤器出口SO₃浓度在150~120 ℃随着烟温的降低下降明显。烟温在120 ℃以下时，SO₃浓度随温度的降低变化不明显，且基本处于15 mg/m³以下。烟温在100 ℃以下时，SO₃浓度基本稳定在10 mg/m³左右；烟温降低至100 ℃左右时SO₃的脱除率为84.3%~88.8%；实测SO₃浓度与各个酸露点公式的吻合度均不好，烟温150 ℃以上时，实测数据明显低于计算值，烟温低于115 ℃时，实测数明显高于计算值；高硫煤低温烟气中SO₃浓度的变化受到烟温及飞灰的影响，通过试验研究得出经验公式可以预测烟气中的SO₃浓度。

关键词: 燃煤电厂, 高硫煤, SO₃, 低低温省煤器, 烟温, 酸露点

Abstract: A low-low temperature economizer test-bed is set up in a generation unit burning high-sulphur coal, and the SO₃ co-removal experiment is carried out in the high-sulfur, low-temperature and high-ash flue gas environment. The results show that the ratio of SO₃ to SO₂ concentrations is about 0.97%, and the SO₃ concentration at the outlet of the low-low temperature economizer drops significantly when the flue gas temperature falls into the range of 150~120℃. By contrast, when the temperature is below 120℃, no significant change of SO₃ concentration is seen with the temperature decrease, which can be kept below 15 mg/m³. While with the temperature of flue gas below 100℃, the SO₃ concentration is basically stabilized at about 10 mg/m³. Especially when the temperature of flue gas decreases to around 100℃, the removal rate of SO₃ is 84.3%~88.8%. Moreover, the measured SO₃ concentrations do not match well with calculated values from the formulas of acid dew point. When the temperature of flue gas is above 150℃, the measured data is apparently lower than the calculated value, while with the temperature below 115℃, the measured value is apparently higher than the calculated value. The change of SO₃ concentration in the low temperature flue gas of high sulphur coal is subject to the flue gas temperature and the fly ash. The empirical formula obtained through this experimental study can effectively forecast the SO₃ concentrations in flue gas.

Key words: coal-fired power plant, high-sulphur coal, SO₃, low-low temperature economizer, flue gas temperature, acid dew point

中图分类号:

TK314

张知翔, 李楠, 邹小刚, 苏林, 李文锋, 李卫涛, 韩键平, 徐党旗. 高硫低温高灰烟气环境中SO₃的行为研究[J]. 中国电力, 2019, 52(3): 23-28.

ZHANG Zhixiang, LI Nan, ZOU Xiaogang, SU Lin, LI Wenfeng, LI Weitao, HAN Jianping, XU Dangqi. Study on the Behavior of Sulphur Trioxide in the High-Sulphur Low-Temperature and High-Ash Flue Gas Environment[J]. Electric Power, 2019, 52(3): 23-28.

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https://www.electricpower.com.cn/CN/Y2019/V52/I3/23

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高硫低温高灰烟气环境中SO₃的行为研究

Study on the Behavior of Sulphur Trioxide in the High-Sulphur Low-Temperature and High-Ash Flue Gas Environment

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