Study On Optimizing Operating Parameters And Structure Of Desulfurization Tower Of Meros Unit In Maanshan Iron&steel Co.

Siemens-VAI has developed the MEROS recently which is a semi-dry flue gas purificationprocess for sintering plant., Maanshan Iron&Steel Co. introduce the process In2008and runofficiallyIn2009.In the actual operation process, there are some disadvantages, such us high materialand energy consumption, high cost and the phenomenon of fouling on one side of the inner wall ofdesulfurization tower is serious which influences the unit operation.Based on the above problems,through monitoring key indicators of desulfurization units in operation process, this paper putforward a optimal scheme of operation parameters of the unit.And software simulation is used forsolving the problem of uneven flow distribution in desulfurization tower.First, the mechanism of MEROS desulphurization process was analyzed.The composition of lime,slaked lime and desulfurization ash were determined by XRD, the results showed that the rawmaterial calcined incompletely.Thus improving the calcination conversion rate of limestone isneeded.On the basis of detecting to2011running data of unit, the desulfurization rate under variousconditions such as entrance gas temperature, calcium-sulfur ratio, SO₂inlet concentration, fluegas residence time, after spraying temperature were measured. The conclusion were: entrance gastemperature, calcium-sulfur ratio, after spraying temperature and flue gas residence time have agreat effect on desulphurization rate to MEROS. SO₂inlet concentration has a opposite result.Second, using SPSS analyses the460groups data by multi-regression. Combination the costequation and optimal model, optimal operation parameters are put forward in different targets.When desulfurization rate is set to85%, the condition of calcium-sulfur ratio is2.43and afterspraying temperature is80℃,saving cost is achieved. When desulfurizationrate is set to80%, thecondition of calcium-sulfur ratio is1.20and after spraying temperature is85℃, saving cost isachieved.Finally, flow field distribution in the desulphurization tower had been simulated by usingFluent software,it was found that flow distribution was uneven. So the tower with straight guideplate was simulated again. The effect of8schemes was compared, the result showed the kind ofheight48m, three plate angle0°,20°,40°respectively, width0.9m,0.5m,0.1m respectively hasa better conclusion.