Ultralow emission online monitoring system for flue gas pollutants of coal-fired power plants

Abstract

The invention discloses an ultralow emission online monitoring system for flue gas pollutants of coal-fired power plants. The system comprises a sampling unit, a back blowing unit, a heat tracing pipe, a calibration unit, a dew-point meter, an air pump, an NOX converter, an analyzing device and a data collecting, processing and transmitting unit. The system is characterized in that an acidification dehumidifier is arranged between the calibration unit and the dew-point meter and used for acidification of flue gas entering the acidification dehumidifier to prevent to-be-tested components in flue gas from dissolving in condensate, and the acidification dehumidifier is provided with an in-situ calibration passage used for calibration of a zero point and a measuring range of the analyzing device. By the ultralow emission online monitoring system, the problem of how to realize accurate and reliable online monitor ultralow emission of sulfur dioxide and nitrogen oxides in desulfurized and denitrified flue gas of the coal-fired power plants is solved, parameters are provided for an ultralow emission process of the coal-fired power plants, and national requirements of ultralow emission online monitoring are met.

Description

technical field [0001] The invention relates to the monitoring of air pollutants from fixed pollution sources, in particular to an online monitoring system for ultra-low emission of air pollutants in coal-fired power plants. Background technique [0002] Ultra-low emission means that coal-fired boilers in thermal power plants adopt efficient collaborative removal integrated system technology for various pollutants in the process of power generation operation and terminal treatment, so that the emission concentration of air pollutants basically meets the emission limits of gas-fired units, that is, soot , sulfur dioxide (SO 2 ), nitrogen oxides (NOx) emission concentration shall not exceed 10mg / m 3 、35mg / m 3 , 50mg / m 3 , whose purpose is to reduce conventional air pollutant emissions from coal-fired power plants, effectively improve environmental quality, and fully implement ultra-low emissions, which can greatly reduce coal consumption and pollution emissions for power ge...

AI Technical Summary

Problems solved by technology

[0008] The above patented technical solutions all limit the concentration of the acid liquid entering the condensing device, and at the same time heat the acid liquid to varying degrees, which can suppress SO to a certain extent 2 , NO 2 The dissolution of the components in water ensures the accuracy of determining the components to be measured; but the above scheme also has certain defects, 1) the concentration of the acid solution added cannot be well controlled, and the concentration of the acid solution is too large, which may cause the material Waste, increase the cost of waste disposal, and even corrode the heat exchange tube of the condenser; 2) No system calibration

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