Research On Total Mercury In Coal-fired Power Plant Flue Gas Online Monitoring Technology

Along with the increasing attention of environmental issues and the rising importance of the environmental protection. Online Monitoring of total mercury in power plant is increasingly important and urgent. The monitoring technology and equipment development of trace mercury in the atmospheric is not only the premise and foundation of online monitoring, but also provide a related standards for flue gas mercury in coal-fired power plants. Based on the ultraviolet differential optical absorption spectroscopy(short as UV-DOAS), the paper mainly focused on the construction of the total flue gas mercury online monitoring system. The work is a preliminary exploration of the total mercury in the flue gas online monitoring systerm. It does a useful exploration for the construction of the experimental system, the selecting of monitoring mode and the improving of the accuracy. It is of great importance both to the power plant online monitoring of flue gas total mercury and energy conservation.The mainly contains of my thesis is listed as follows:(1). The thesis analysis the oxidized mercury reduction method and its advantages and disadvantages,and also illustrate the development direction of oxidized mercury reduction methods. Introduced the structure and optical monitoring methods of mercury online monitoring system, as well as technical difficulty and problems that exist in the implementation of the monitoring process.(2).Based on UV-DOAS and Saturated Vapor Pressure Methond, mercury online monitoring system was constructed. Besides, select the appropriate type of the related devices.(3).Set permeation tube as mercury source,by analyzing the integration range of the peak area corresponding to the concentration of gas mercury,the experiment get the best integrator scope of peak area in the mercury online monitoring system. Then the paper verify the correlation coefficient of the certain integration scope and gas mercury again. Using the absorption cross section obtain by mercury permeate tube and set it as the experimental basis. Finally the accuracy of the overall equipment online monitoring system can be tested.(4).Finally the thesis analyzed the experimental results, summarized the reasons for errors, proposed appropriate measures for improvement of the system.