The Study Of Desulphurization Efficiency By Seawater In Pack Absorption Tower

Coastal power plants using rich seawater as condenser cooling water shed from condenser has the same alkalinity as original,and can be used as the absorption medium in flue gas desulfrization(FGD).Therefore, SFGD was utilized gradually increasing by coal-fired power plant along the coast in recent years.As the technology has been monopolized by foreign companies, most of the current operations in SFGD projects,are independent completed or foreign design companies to design parameters and supply key equipments, the Chinese side is responsible for construction. Domestic companies have mastered the main technical,economic indicators, the major equipments selection and process design of SFGD through the introduction of technology, joint design,etc.,but SO2 absorption mechanism in seawater and the factors affect the SO2 removal efficiency of seawater such as alkalinity, salinity, CO2 concentration,temperature, and packing characteristics.That all leading the design and application by experience,and without quantitative and theoretical guidance.So we have researched the seawater salinity (practical salinity 31～41),temperature (13-55℃),alkalinity (2.28～2.81mmol/L) and other factors such as the types of filling, the CO2 and SO2 concentration in flue on the efficiency of SFGD effects. Combination of experimental data obtained design parameters seawater desulfurization tower and a power plant, three types of structured packing on the seven filling the desulfurization performance testing program. Considering the experimental data we have calculated parameters of seawater desulfurization tower, and carry out experiment at a power plant using seven packing programs of three structured packings on the desulfurization performance testing. Compare with the SO2 removal efficiency of a plastic bulk packing, we obtains the factors affecting desulfurization efficiency, and parameters model of evaluate packing performance. In view of low SO2 removal efficiency that can not meet environmental protection requirements, use pure seawater FGD technology to remove of SO2 from flue gas of high sulfur coal,the study developed method that load active metal oxide catalyst on the surface of structured packing which can catalyst oxidate SO2 to SO3. Then SO3 easily absorbed by seawater, thus reduce the SO32- concentration and seawater COD.The catalytic performance has been evaluated in laboratory scale test and get satisfactory results.To enhance desulfurization effect of packing tower in SFGD technology, we proposed to use regular packing (or ceramic packing loaded catalysts) to replace the existing bulk packing, and longer packing life.