摘要
据统计,2015年我国消耗了39.65亿吨煤炭,而其中发电及热力供应占据了煤炭消耗总量的46.38%。发电及热力供应行业排放的CO_2占据了我国温室气体排放量的很大比例,因此对于燃煤电厂CO_2气体排放的实时监测是非常重要的。利用测量精度高、响应迅速、非接触测量的可调谐半导体激光吸收光谱(TDLAS)技术对CO_2浓度检测。选用了中心波长在1 580 nm的分布式反馈激光器作为光源,参考电厂尾部烟气CO_2浓度配置实验气体,分别使用直接吸收和波长调制方法对CO_2浓度进行反演。对比研究结果表明,直接吸收和波长调制法重复测量的相对标准偏差分别为0.94%和0.22%,最大相对误差分别为2.64%和1.65%,检测限分别为0.013 6%和0.001 4%。波长调制法比直接吸收法在测量性能指标上更具优势,但由于波长调制法在现场应用时受定标方式的影响很大,且谐波线宽会受到压力、温度等参数变化的干扰,而直接吸收法无需标定,且测量精度足以满足电厂CO_2在线监测的需求。因此在电厂锅炉烟气等高浓度CO_2的测量中,直接吸收法是更好的选择。
According to the statistics, 39.65 billion tons of coal has been consumed up from China in2015. Obviously, CO2 emission from power generation and thermal supply industry segment contributes alarge part to global warming. Therefore, it is of great importance for online monitoring of CO2 emissions from coal-fired power plants. The CO2 concentration was measured by tunable semiconductor laser absorption spectrum（TDLAS）, which had the benefits of high accuracy, rapid response, non-contact, etc.In order to prevent interference from absorption of other gases, a distributed feedback laser with a center wavelength of 1 580 nm was chosen as the light source. Simulated flue gas was made referring to the concentration of CO2 in the flue gas of the power plant. The direct absorption（DA） and wavelength modulation（WM） methods were used to measure the CO2 concentration. The results show that the relative standard deviation（RSD） for DA and WM are 0.94% and 0.22%, while the maximum relative errors and detection limits for DA and WM are 2.64% and 1.65%, 0.013 6% and 0.001 4%. It is found that WM is better than DA in measurement qualities. But the WM method is influenced by the calibration method in field application and the line width is interfered by the fluctuations of the parameters such as pressure and temperature, resulting in reduced long-term stability. In the case of the DA method, the concentration can be calculated directly by measuring the absorbance, line strength and pressure without calibration. It has a high signal-to-noise ratio for the measurement of gas with high concentration. Meanwhile, the measurement accuracy is high enough to meet the requirement for CO2 online measurement in power plants. Therefore, the DA method is a better choice for the CO2 measurement in the flue gas of power plant boiler.
作者
卢伟业
朱晓睿
李越胜
姚顺春
卢志民
曲艺
饶雨舟
李峥辉
Lu Weiye;Zhu Xiaorui;Li Yuesheng;Yao Shunchun;Lu Zhimin;Qu Yi;Rao Yuzhou;Li Zhenghui(Shunde Inspection Institute of Special Equipment Inspection and Research Institute of Guangdong Province,Foshan 528300,China;School of Electric Power,South China University of Technology,Guangzhou 510640,China;Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization,Guangzhou 510640,China;Guangdong Province Engineering Research Center of High Efficient and Low Pollution Energy Conversion,Guangzhou 510640,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2018年第7期145-150,共6页
Infrared and Laser Engineering
基金
广东省质量技术监督局科技计划(2016ZT01)
"广东特支计划"科技青年拔尖人才(2014TQ01N334)
广州市珠江科技新星专项(2014J2200054)
作者简介
卢伟业（1987-），男，工程师，硕士，主要从事特种设备检验安全节能及碳排放核查监测技术方面的研究，Email：247838986@qq.com;通讯作者：姚顺春（1983-），男，副教授，博士生导师，博士，主要从事燃烧诊断与排放监测技术方面的研究，Email：epscyao@scut.edu.cn
