Research On The United Removal Test And Optimization Of Desulfurization And Denitration Demercuration On Circulating Fluidized Bed Boiler

In this paper, taking the #4 unit in Shanxi coal gangue power plant 300MW CFB existing pollutant control system asthe research object, By studying the formation mechanism of pollutants circulating fluidized bed boiler, the original furnace desulfurization and denitrification systems technology, and in order to meet new environmental standards new desulfurization and denitrification systems technology, analyze the impact of various major factors of desulfurization and denitration. Establish the corresponding parameter model, the SO2, NOX emission concentration, desulfurization and denitrification efficiency as well as several major factors influence the efficiency of desulfurization and denitrification as constraints, the desulfurization and denitrification system economic indicators as the objective function, by solving the optimization model, both satisfy the constraints they get the raw material consumption and electricity consumption of a minimal set of solutions.This paper first describes the on-line monitoring and off-line monitoring technology in flue gas mercury and its compounds, then analysis the different conditions of the mercury content of coal and combustion products of a 300MW circulating fluidized bed boiler test, the results show that, mercury content in fly ash was positively correlated to LOI and surface area, mercury content of combustion products was increased with increasing Boiler load, and analyzes the CFB boiler advantage in mercury removal. To further reduce the mercury content in the flue gas, achieve ultra-low emissions of mercury, on the basis of full use of existing installations, design a collaborative mercury removal process, it selects the oxidant for boiler-front to add more Hg0 converted to Hg2+,tail humidification activation device makes the fly ash more Hg2+ is converted to Hg(p),thereby trapping baghouse, and analyze the feasibility of the process. Desulfurization and denitrification systems to economic indicators as the objective function, the electric discharge concentration, desulfurization and denitrification efficiency, fans and motors consume as constraintsIn this paper, then through the test get curve between Ca/S molar ratio, bed temperature, NSR, reductant injection point temperature and desulfurization and denitrification efficiency; by solve the model get the desulphurization and denitrification coefficients and power consumption factor, combined with multi-parameter model, Simplify solving a set of best optimal solution to satisfy both the constraints and economic indicators. Finally, by comparing the unit actual operation parameters and optimize the model request parameter values, found that in both cases the concentration of pollutants can meet the’new standard’.However, after optimization of the economic indicators better than the actual operation. Therefore, the optimal solution can provide a reference for seeking optimal operation of the power plant unit.