Experimental Research On Desulfurization, Denitrification And Demercuration From Coal-fired Gas By Semidry Technology

The pollutants of coal-fired power plant flue gas such as SO2, NO x and Hg contained serious harm to the environment, and affect human health. Based on the various pollutants of coal-fired power plant flue gas characteristics and emissions conditions, scholars developed a variety of technical methods for pollution control and and it becomes development maturity and innovation in the industrial application. Compared with single pollutant control technology, emerging pollutants has many advantages such as more joint control technology, low energy consumption, simple equipment, less investment, cover an small area, low operation cost. It is the development trend of flue gas pollutants control technology.This topic mainly studied for emissions of sulfur oxides, nitrogen oxides, metallic mercury and other pollution problems in the coal-fired power plant flue gas, screening and preparation of composite antioxidants FPN and HSN was applied to semi-dry desulfurization at the same time denitration to take off the mercury process, researched the composite antioxidant ratio of each component in the optimized, and obtained the optimal compound oxidant. Experiments by investigating various related factors on the influence of two kinds of compound antioxidant pollutants removal efficiency: learned FPN composite oxidant in simulated flue gas intake rate of 3.5 L/min, the reaction temperature is 90 ℃, compound oxidant injection rate 150 μL/min, compound oxidant p H 1.14, O2 concentration of 6%(V/V), in the NO concentration of 400 mg/m3, SO2 concentration of 1000 mg/m3, concentration of Hg 200 mu g/m3, the average efficiency of desulphurization and denitration, mercury is respectively 100%, 84%, 77%; learned HSN composite oxidant simulated flue gas intake rate of 2.0 L/min, the reaction temperature is 110 ℃, compound oxidant injection rate 250 mu L/min, compound oxidant p H 5.5, O2 concentration of 6%(V/V), in the NO concentration of 400 mg/m3, SO2 concentration of 1000 mg/m3, concentration of Hg 200 μg/m3, and through repeated experiments verify the efficiency of desulphurization and denitration, mercury’s average of 99%, 79% and 81% respectively. Combining with the experiments of factor influence, characterization of the product, put forward the composite antioxidant reaction mechanism of taking off the mercury,desulfurization and denitration.