Coal-fired Flue Gas Desulfurization The Integration Processes Pilot Study

Based on the existing WFGD system, the suitable technology of denitrification has been studied in the paper, which can realize the integration process of desulfurization and denitration.The experiment was divided into three stages:pilot plant test, technological experiment and numerical simulation:The pilot trial equipment was located in Qinhuangdao Power Plant. The main component of oxidant is H2O2. In a counter-current way, the experiment was conducted by changing oxidant concentration (30%,39.5% and 50%), flow (0.03m3/h, 0.06m3/h,0.09m3/h and 0.12m3/h) and flue gas flow rate (6000m3/h,9000m3/h and 12000m3/h). The oxidant had taken good performance through test. When the oxidant concentration is 50%, oxidizability of NOx was close to 60%. The oxidation percentage of NOx increased along with the oxidants concentration.The technological experiment was conducted on the basis of theoretical study and pilot plant test. Oxidant and oxidant with urea as the additive were studied. Process parameters such as oxidant flow, concentration were studied. The experiments acquired good results and it was indicated that, oxidant has good effect on the NOx reduction efficiency, while combining additive with oxidant has a better one, and the efficiency of denitration and desulfurization reached 35% and 99%. According to the pilot and commercial test results, recommend the best molar ratio (H2O2/NOx) is 4.8.The mathematical model of flue, established by FLUENT hydrodynamics simulation software, simulated the interior flow field and analyzed the influence of the spray layers number on flow field, which provided important reference to the flue and spray layer.