Analysis Of Related Issues Of SO₂ Plasmaremoval And Experimental Study On It

Around the national energy conservation policy, research and development of new high-efficiency desulfurization and denitration technology is a priority. Low temperature plasma is a kind of effective desulfurization and denitration technology, but also need to be from the perspective of reducing energy consumption and improve the efficiency and practical, in-depth study of the system. Papers with low temperature plasma desulfurization as the research object, on the desulfurization mechanism, composition of reactor and internal electric field, desulfurization characteristics and so on three aspects has carried on the exploration, in order to provide a reference for further study of appropriate practical plasma desulfurization technology. In this paper, the main work done and the results are as follows:(1) Combined with the literature analysis of the plasma desulfurization mechanism, and concluded that low temperature plasma removal SO2 have reduction and oxidation two ways, the oxidation pathway is the main route of removing SO2; In oxidation way, SO2 is oxidized by O, OH those active free radical, and then be removed.(2) Analysis of the plasma reactor structure, and compared the two kinds of typical dielectric barrier discharge structure, the comprehensive analysis of their manufacture process and the required voltage at work, chose the coaxial cylinder structure of the dielectric barrier discharge reactor; Dielectric layer is an important part of the reactor, it should have some special properties, by comparing the performance of various common dielectric material, chose the quartz glass tube as the dielectric material of the present experiment.(3) Analysis of the internal electric field of plasma reactor, the more stronger of the voltage on the reactor, the more strength of electric field intensity produced by voltage, and the more easy of the gas breakdown, through the theory study of the relationship between the minimum breakdown voltage of the reactor and the inner radius of the electrode, determines the value of the radius of the electrode. At the same time, through experiments studied the relationship between the residence time of gas in the reactor and removal rate, determine the length of the outer electrode copper mesh.(4) Built plasma desulfurization experiment system, and study of plasma desulfurization experiment under the influence of many factors, get the following conclusion: plasma power characteristics for removing SO2 has a promoting effect, increase the voltage or frequency can reduce the emissions of SO2 at a certain extent, and improve the efficiency of flue gas purification; with increasing concentration of O2 and adding H2 O, SO2 removal efficiency increased gradually; When the O2 and H2 O interaction at the same time, SO2 removal rate are higher than that of O2 and H2 O alone; access the Ca(OH)2 tail gas as absorber, before opening the plasma, most SO2 has been absorbed, after opening the plasma, regardless of the distribution system with O2, or H2 O, or O2 and H2 O to join together, SO2 removal efficiency is 100%.