洁净煤技术

2019, v.25;No.124(06) 152-157

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火电机组烟气中CO在线测量方法对比研究
Comparative and research on on-line measurement of CO in flue gas of thermal power unit

郝剑;周佩丽;彭志敏;丁艳军;
HAO Jian;ZHOU Peili;PENG Zhimin;DING Yanjun;Sanhe Power Co.,Ltd.;Department of Energy and Power Engineering,Tsinghua University;

摘要(Abstract):

目前火电机组一般采用氧含量作为燃烧效率监测的参考量,而氧含量无法准确反映燃烧过程中风煤的混合情况,且氧含量的测量受空气影响较大,因此,在测量烟气中氧含量的基础上,结合对不完全燃烧产物CO的浓度测量,可提高燃烧效率监测的可靠性。针对目前常用的2种技术路线的CO监测仪进行了对比,即基于非分散红外(NDIR)取样式测量和基于可调谐激光二极管吸收光谱(TDLAS)原位式测量。NDIR取样式测量仪表将取样杆安装于省煤器出口后烟道内部,取样后的气体经过多级过滤、冷凝除水等预处理后进入分析仪进行NDIR测量;TDLAS原位式测量仪表将测量腔体安装于省煤器出口后烟道内部,烟气经过测量腔体前端过滤器后进入测量腔体内部进行TDLAS测量。测量结果表明:火电机组烟气中CO浓度具有变化幅度大、变化速度快等特点,基于NDIR的取样式测量由于取样路径原因导致延时时间长,而且其多级过滤、冷凝除水等预处理装置复杂导致系统维护量大,同时该仪表取样过程中由于气体的吸附或反应特性易引起测量结果失真;而基于TDLAS的原位式测量由于将测量腔体安装于烟道内部,取样路径短,响应速度快,能够及时响应CO浓度瞬时变化,而且该仪表采用一体式结构设计,系统稳定性高,维护量小,同时由于该仪表测量腔体在烟道内部,测量环境与烟道环境一致,可实现高保真测量。
At present,oxygen content is generally used as the reference quantity for combustion efficiency monitoring in thermal power units. However,oxygen content can′t accurately reflect the mixing situation of wind coal inthe combustion process,and the oxygen measurement in flue gas is greatly affected by the oxygen in air. Therefore,on the basis of oxygen measurement,and combined with the CO concentration measurement of incomplete combustion,the reliability of combustion efficiency monitoring can be improved.A comparative study of two kinds of CO measuring instruments was carried out,which were realized based on NDIR technology with sampling mode and TDLAS technology with in-suit mode,respectively. The sampling probe rod of NDIR-based with sampling mode instrument was installed in the flue behind the economizer,and the sample gas entered the analyzer for NDIR measurement after the pretreatments which included multistage filtration and condensation and water removal. The measurement chamber of TDLAS-based with in-situ mode instrument was installed in the flue after the economizer,and the flue gas entered the chamber to realize TDLAS measurement after passing through the filter which was installed on the chamber front end. The measurement results show that CO concentration in the flue gas of thermal power units has the characteristics of large variation range and fast change speed. The NDIR-based with sampling mode instrument has a long-time delay due to the sampling path,and it has the shortcoming of large maintenance because of the complex pretreatment such as multi-stage filtration,condensation and water removal,at the same time,the measurement results are easy to be untrue due to the adsorption or reaction characteristics of the gas during the sampling process. The TDLAS-based with in-suit mode instrument is able to respond to the instantaneous change of CO concentration in time due to the short sampling path and fast response speed when the measurement chamber is installed in the flue,and the instrument adopts the integrated structure design,which has high system stability and small maintenance,at the same time,the instrument can realize the high fidelity measurement because the measurement chamber is installed in the flue which can ensure that the measurement environment is consistent with the flue environment.

关键词(KeyWords): 火电机组;CO浓度测量;可调谐二极管激光吸收光谱;非分散红外;燃烧优化
thermal power units;CO concentration measurement;TDLAS;NDIR;combustion optimization

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基金项目(Foundation): 国家重点研发计划资助项目(2016YFC0201100)

作者(Author): 郝剑;周佩丽;彭志敏;丁艳军;
HAO Jian;ZHOU Peili;PENG Zhimin;DING Yanjun;Sanhe Power Co.,Ltd.;Department of Energy and Power Engineering,Tsinghua University;

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