Research Of Mercury Measurement From Coal-fired Power Plant And Mercury Stability In Its Adsorptive Product

This research relies on the projects— Estimation of Mercury Emission from Coal Use in China (Chinese Special Funds for High Tech Research and Development "863" Program, No. 2005AA520080) and Stabilization mechanisms of mercury during its control in coal-fired flue gas (Chinese National Natural Science Foundation No. 50476056). Some relevant experiments have been done in the technology of gaseous mercury sample and analysis by solid sorbent, which is also used in the measurement of mercury emission from an incinerator power plant. The research refers to a measurement of speciation mercury emission from a 600MW coal-fired utility boiler. In addition, the researches of mercury stability on the simulated mercury control products from coal-fired power plant have been studied.At first, it focused on testing the surface physical characters and mercury content of the different activated carbons (ACs). After comparing several parameters, No.1 AC was selected as the material in the next sorbent research. Then the AC's surface modifed experiments about high temperature de-absorbed and iodine-loaded were conducted.In the further study, the research of mercury adsorbed by AC was carried on the fixed-bed experimental table. Firstly mercury adsorptive characters of gold trap were investigated, and it is found that gold is not the ideal sorbent. Through the comparing experiments of AC's mercury adsorptive with different particle diameters and different surface treatments, the best AC was selected out. The database of iodized AC in mercury adsorptive had been set up after a series work. Based on the former study, the iodized-AC traps were made with the help of Method 324. Further tests were carried on the iodized AC traps, including some verification experiments. All the data of these experiments showed that the traps met the request of Method 324.In addition, the gaseous mercury sample train with the iodized-AC trap was applied to practicable sampling at an incinerator power plant. Compared with the data that CEM measured, the sample train result showed some different in the same test spots. It means that this solid adsorbing sampling technology needs further improvement. Meanwhile, this research also tested the mercury speciation emission from a 600MW utility boiler with Standard Ontario-Hydro Method.Finally, mercury adsorptive ACs were produced in the simulated fluid-bed under different work conditions. It used the leaching test to simulate the burying condition of the mercury emission control products with different leaching solutions. The stability of mercury adsorptive products was judged through testing the change of the mercury concentration in the leachate. At the same time, the standard leaching method of TCLP was used as reference scale on determination the mercury leaching safety of the adsorptive products. Comparing the results of these two tests, it can provide credible judgments for the stability research of mercury emission controlling products from coal-fired power plant.