Structure Design And Optimization Of Fast Assembly Desulfurization Tower For Industrial Boilers

With the development of productivity and the increase of energy consumption, sulfur dioxide mix with the flue gas when industrial boilers burn the coal as fuel. Sulfur dioxide will not only cause the greenhouse effect and the acidification of soil and water, but also affect the normal life of plants and animals seriously. In order to reduce the adverse effect of sulfur dioxide to the environment, various countries started to study the desulfurization technology, and gradually extended to the flue gas treatment system of a large boiler.In China more than 95% of the boilers are small or medium size industrial boilers, with financial and technical strength of the weak features,,it’s difficult to undertake the high price of the installation and operation costs for the large flue gas desulphurization system.Therefore, the design of fast assembly desulfurization towers for industrial boiler is of great significance.After the analysis of the commonly used in flue gas desulfurization technology, compared the pros and cons of various desulfurization technology, the wet flue gas desulfurization technology is able to adapt to the high emission requirements in present. The wet limestone flue gas desulfurization technology as an example, which is the most widely used in the current application, based on the two-film theory and the ionization equation, analysis of the factors which influence the desulfurization efficiency of the process. In order to promote the process of the mass transfer when the gas and liquid is mixing, the swirl atomizing injection technique is introduced, combining ordinary spray as double absorption pattern, which improving the absorption efficiency and reducing the liquid-gas ratio of desulphurization.Control the slurry of p H value is about 5.4, and the gypsum super-saturation rate is 120% to 130%, which can not only ensure the absorption effect, but also improve the quality of gypsum.An example for a 75t/h Industrial Boiler using limestone wet flue gas desulfurization technology absorption tower in Guangdong, according to the coal quality, capacity of the boiler, flue gas, parameters of absorbent absorber. After the calculation of the removing sulfur, obtaining the dosage of absorbent, the production of gypsum and the quantity demanded of cycling slurry, oxidation air and other parameters for design.According to the design parameters calculated for absorption tower for the 75t/h boiler, and the absorption system optimization. The diameter of the slurry pool is 5.0m, the working slurry level is 6.1m.In the absorption zone,three layers in upper region are common spray layers,the staggered angle of adjoining layers is 15°,Two layers in lower region are atomizing spray layers, the staggered angle of adjoining layers is 45°.The circle diameter of cyclone atomizing spray layer is 1700 mm, the altitude of the circle is 200 mm to 500 mm below the center of the atomizer.Through the data tested in the reform of the desulphurization tower for a power plant and an industrial boiler, a layer of atomizing layer added below the three ordinary spray layers, which can improve the absorption efficiency of 2% to 4%. It can be infered that the design of absorption area made up by two atomizing spray layers at lower region and the three layers of ordinary spray layer at upper region will meet the design requirements of the desulfurization efficiency of 98.9%.