The Ammonia Flue Gas Desulfurization (FGD) Technology For Small-scale Coal-fired Boiler

The view of this paper from the state environmental safety point.The theme is to control sulfur-dioxide air pollution,and focused on the ammonia flue gas desulfurization technology for small-scale coal-fired boiler.Established a theory model of the ammonia flue gas desulfurization technology for small-scale coal-fired boiler by the calculation of the actual small coal-fired boiler flue gas parameters. Use the FLUENT(a fluid dynamics analysis software) to simulate the established theoretical model,and further to correct the shortcomings,and then build the desulfurization system for the actual small-scale coal-fired boiler.Eventually,obtain the optimal operating parameters for themmonia desulfurization system of the small-scale coal-fired boiler,by means of experiment and combined with statistical analysis software.First,the ammonia desulfurization technology applicated the small coal-fired boiler flue gas desulfurization by its high efficiency,small footprint device,the system easy to maintain and operate.Second,divided the desulfurization process into a variety of interactions between fluids,then analysing the of filter systems and the desulfurization tower body use the FLUENT software.The results show that the theoretical calculations the of filter on desulfurization can meet the required of the filter system in the actual flue gas parameters.For the desulfurization tower model,that the desulfurization effect able to meet the practical needs but there is a phenomenon that the smoke movement in the empty tower uneven distribution ,so the modify need to correct;Finally,optimized the desulfurization system operating parameters by means of experiments on the atually desulfurization system.The desulfurization efficiency of the system by the flue gas flow rate,gas liquid ratio,initial concentration of absorption solution verified use the single factor experiments,the results show that for the efficiency of flue gas flow rate there existed an optimal value make the desulfurization efficiency maximum.Liquid gas ratio on the desulfurization efficiency is the ratio increases as the liquid gas desulphurization efficiency increases,but eventually stabilize desulfurization efficiency.Absorption of the initial concentration on the desulfurization efficiency is higher the initial concentration of absorbent higher desulfurization efficiency,but eventually stabilize desulfurization efficiency.Then useThe orthogonal-rotation experiment to explore the effect of the complex factors on the desulfurization.Analyzing the complex experimental results use the SAS software ,and obtaining the secondary surface equation between the factors of the desulfurization efficiency(Y) and flue gas flow rate(X1),liquid to gas ratio(X2),the initial concentration of absorption solution(X3 ) and the desulfurization system.And then analysed the complex experimental results use the Design-Expert software that obtain the difference between the actualy measured values and the model equation predicted,but also come to the response surface maps under the action of liquid to gas ratio and initial concentration of absorption solution,further verifing the reasonable of the response surface quadratic model equation. Abtaining the desulfurization system optimal operating parameters by analyed the experimental data and the experimental results that were:initial concentration of absorption solution between of 14% -17%,and liquid to gas ratio between 1.5-2.0L/m3,the flue gas flow rate also between in the 1.5-2.0m/s.