超低排放机组烟尘浓度测量方法的干扰因素分析及选型
Analysis of interference and selection of particle measurement methods for ultra-low emission coal-fired power plants
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摘要: 针对超低排放下低浓度烟尘测量，分别介绍了激光前散射法、交流微电荷法和β射线法3种测量方法的原理和特点。在采用超低排放工艺的火电机组中，同时用上述3种测量方式分别分析了干式电除尘器出口和脱硫吸收塔出口的烟尘浓度。利用称重法对比分析测量结果，各种方法针对不同测量点位适应性迥异进行实验分析。对于干式静电除尘器，激光前散射法响应速度更快，β射线法则有明显迟滞；对于湿法脱硫及湿式电除尘器，β射线法更为适用，但需增设前置加热设备来消除湿烟气影响。Abstract: In this paper, the principle and applicability of three different measurement methods are discussed:laser light forward scatting, AC micro-charge, and β-ray methods, for particulate matter (PM) measurements at low emission concentration.In a coal-fired power plant with ultra-low emission processes, all three of these methods were carried out at the outlets of a dry electrostatic precipitator and flue gas desulfurizer, to measure the dust concentration.Referring to the measurements obtained via the traditional weight method, the three experimental methods were compared for this application.For the dry electrostatic precipitator (ESP), the laser light forward scatting method showed shorter response time than did the β-ray method, while only the β-ray method, with pre-heating of the device, could be adapted for wet desulfurization and wet ESP.
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Key words:
- ultra-low emission /
- particle measurement /
- influence factors /
- method selection
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