高硫低温高灰烟气环境中SO_3的行为研究
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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SO_3协同脱除试验研究。试验结果表明:SO_3与SO2浓度之比约为0.97%;高硫煤低低温省煤器出口SO_3浓度在150～120℃随着烟温的降低下降明显。烟温在120℃以下时,SO_3浓度随温度的降低变化不明显,且基本处于15 mg/m~3以下。烟温在100℃以下时,SO_3浓度基本稳定在10 mg/m3左右;烟温降低至100℃左右时SO_3的脱除率为84.3%～88.8%;实测SO_3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SO_3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SO_3浓度。
A low-low temperature economizer test-bed is set up in a generation unit burning high-sulphur coal, and the SO_3 coremoval experiment is carried out in the high-sulfur, low-temperature and high-ash flue gas environment. The results show that the ratio of SO_3 to SO_2 concentrations is about 0.97%, and the SO_3 concentration at the outlet of the low-low temperature economizer drops significantly when the flue gas temperature falls into the range of 150～120 °C. By contrast, when the temperature is below 120 °C,no significant change of SO_3 concentration is seen with the temperature decrease, which can be kept below 15 mg/m~3. While with the temperature of flue gas below 100 °C, the SO_3 concentration is basically stabilized at about 10 mg/m~3. Especially when the temperature of flue gas decreases to around 100 °C, the removal rate of SO_3 is 84.3%～88.8%. Moreover, the measured SO_3 concentrations do not match well with calculated values from the formulas of acid dew point. When the temperature of flue gas is above 150 °C, the measured data is apparently lower than the calculated value, while with the temperature below 115 °C, the measured value is apparently higher than the calculated value. The change of SO_3 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 SO_3 concentrations in flue gas.
A low-low temperature economizer test-bed is set up in a generation unit burning high-sulphur coal, and the SO_3 coremoval experiment is carried out in the high-sulfur, low-temperature and high-ash flue gas environment. The results show that the ratio of SO_3 to SO_2 concentrations is about 0.97%, and the SO_3 concentration at the outlet of the low-low temperature economizer drops significantly when the flue gas temperature falls into the range of 150～120 °C. By contrast, when the temperature is below 120 °C,no significant change of SO_3 concentration is seen with the temperature decrease, which can be kept below 15 mg/m~3. While with the temperature of flue gas below 100 °C, the SO_3 concentration is basically stabilized at about 10 mg/m~3. Especially when the temperature of flue gas decreases to around 100 °C, the removal rate of SO_3 is 84.3%～88.8%. Moreover, the measured SO_3 concentrations do not match well with calculated values from the formulas of acid dew point. When the temperature of flue gas is above 150 °C, the measured data is apparently lower than the calculated value, while with the temperature below 115 °C, the measured value is apparently higher than the calculated value. The change of SO_3 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 SO_3 concentrations in flue gas.
引文
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[14]向柏祥,邢文崇,李健峰,等.烟气酸露点的测量与计算关联式的修正[J].锅炉技术,2014,45(1):1-4.XIANG Baixiang,XING Wenchong,LI Jianfeng,et al.The measurement and correction of correlation formulas of flue gas acid dew point[J].Boiler Technology,2014,45(1):1-4.
[2]张劲松,孙捷,张发捷,等.烟气成分及SCR脱硝系统运行特性对烟羽形成的影响[J].热力发电,2017,46(12):111-116.ZHANG Jinsong,SUN Jie,ZHANG Fajie,et al.Effects of flue gas components and operation performance of SCR system on formation of smoke plumes[J].Thermal Power Generation,2017,46(12):111-116.
[3]蒋海涛,蔡兴飞,付玉玲,等.燃煤电厂SO3形成、危害及控制技术[J].发电设备,2013,27(5):366-368.JIANG Haitao,CAI Xingfei,FU Yuling,et al.Formation,harms and control technology of SO3 from coal-fired power plants[J].Power Equipment,2013,27(5):366-368.
[4]赵海宝,郦建国,何毓忠,等.低低温电除尘关键技术研究与应用[J].中国电力,2014,47(10):117-121.ZHAO Haibao,LI Jianguo,HE Yuzhong,et al.Research and application on low-low temperature electrostatic precipitator technology[J].Electric Power,2014,47(10):117-121.
[5]郦建国,龙辉,郦祝海,等.低低温电除尘技术研究及应用[C]//第十五届中国电除尘学术会议论文集,蚌埠,2013:17-26.LI Jianguo,LONG Hui,LI Zhuhai,et al.Research and application on low-low temperature electrostatic precipitator technology[C]//Proceedings of 15th Conference of ESP,Bengbu,2013:17-26.
[6]叶子仪,刘胜强,曾毅夫,等.低低温电除尘技术在燃煤电厂的应用[J].中国环保产业,2015(5):22-25.YE Ziyi,LIU Shengqiang,ZENG Yifu,et al.Application of LLWtemperature ESP in coal-fired power plant[J].China Environmental Protection Industry,2015(5):22-25.
[7]吴金,刘含笑,郦建国,等.基于中试平台的低低温电除尘器深度试验研究[J].中国电力,2018,51(6):11-16.WU Jin,LIU Hanxiao,LI Jianguo,et al.The in-depth experimental study on the low low-temperature electrostatic precipitator based on pilot platform[J].Electric Power,2018,51(6):11-16.
[8]徐克涛,马俊飞,张杨.水媒式烟气换热装置的运行现状分析与优化措施探讨[J].中国电力,2019,52(1):118-123.XU Ketao,MA Junfei,ZHANG Yang.Current operation state analysis on WGGH equipment and optimization method exploration[J].Electric Power,2019,52(1):118-123.
[9]张知翔,周岩,贾兆鹏,等.分离式低温省煤器与暖风器系统经济型分析[J].热力发电,2017,46(11):7-11.ZHANG Zhixiang,ZHOU Yan,JIA Zhaopeng,et al.Study on separated system of low pressure economizer and air heater[J].Thermal Power Generation,2017,46(11):7-11.
[10]张华东,张知翔,贾兆鹏,等.低温省煤器与暖风器联合系统应用[J].热力发电,2016,45(10):127-132.ZHANG Huadong,ZHANG Zhixiang,JIA Zhaopeng,et al.Study on combined system of low pressure economizer and air heater[J].Thermal Power Generation,2016,45(10):127-132.
[11]吕凯,佘园元,张知翔,等.低低温省煤器联合暖风器系统运行优化[J].热力发电,2018,47(6):105-110.LV Kai,SHE Yuanyuan,ZHANG Zhixiang,et al.Study on operation optimization of combined system of low pressure economizer and air heater[J].Thermal Power Generation,2018,47(6):105-110.
[12]陆军,刘永强,周飞,等.高硫煤机组低低温省煤器SO3协同脱除试验研究[J].热力发电,2016,45(12):30-36.LU Jun,LIU Yongqiang,ZHOU Fei,et al.Experimental research on simultaneous control of SO3 concentration by low-low temperature economizer of high-sulfur coal unit[J].Thermal Power Generation,2016,45(12):30-36.
[13]向柏祥,杨海瑞,张缦,等.火电厂烟气酸露点的研究综述[C]//全国电力行业CFB机组技术交流服务协作网第十一届年会暨第三届中国循环流化床燃烧理论与技术学术会议,鄂尔多斯,2012:269-280.XIANG Baixiang,YANG Hairui,ZHANG Man,et al.Review of calculation methods of acid dew point of flue gas[C]//The 11th CFBUnit Technical Exchange Service Collaboration Network in Electric Power Industry Annual Conference and the 3rd China Circulating Fluidized Bed Combustion Theory and Technology Symposium,Ordos,2012:269-280.
[14]向柏祥,邢文崇,李健峰,等.烟气酸露点的测量与计算关联式的修正[J].锅炉技术,2014,45(1):1-4.XIANG Baixiang,XING Wenchong,LI Jianfeng,et al.The measurement and correction of correlation formulas of flue gas acid dew point[J].Boiler Technology,2014,45(1):1-4.