【作者】 穆为成；

【导师】 张玉；

【作者基本信息】 大连理工大学 ， 环境工程， 2012， 硕士

【摘要】 本文通过将铁法烟气脱硫工艺和镁法烟气脱硫工艺组合为两段式脱硫工艺,来降低填料吸收塔的填料高度,减少氧化剂的投加量。通过连续运行实验,获得了较高的脱硫效率,通过两个脱硫段浆液混合后可副产物复合絮凝剂聚合硫酸镁铁PFMS稀溶液,并考察了脱硫副产物PFMS与聚合硫酸铁PFS的絮凝性能。确定铁法脱硫段的填料高度为0.2m,吸收液温度为室温15℃。通过研究烟气进口二氧化硫浓度和液气比对铁法段脱硫率的影响,确定了铁法段脱硫率为38%-75%的烟气进口二氧化硫浓度和液气比范围。通过对烟气进口二氧化硫浓度、液气比对氧化镁脱硫效率的影响研究。可在铁法脱硫段选定烟气进口二氧化硫浓度和液气比基础上,确定镁法脱硫段的液气比,保证在高效的脱硫的同时副产不同镁含量的PFMS。选取组合工艺中铁法脱硫段和镁法脱硫段合适条件连续运行,取得平均91%以上的脱硫效率并副产复合絮凝剂PFMS稀溶液。与铁法脱硫工艺相比,在达到相近脱硫率的情况下,填料高度降低了0.8m,降低高度达到了2/3。理论计算显示,生产1吨聚合硫酸镁铁PFMS副产物的原料成本降低了20.85元,其中氧化剂成本降低16.96元。通过对高岭土模拟的浊度废水、直接耐晒黑G模拟的印染废水和实际焦化废水分别去除浊度、色度和COD实验,考察了脱硫副产物PFMS、脱硫副产物PFS和市售工业固体PFS产品的絮凝性能。实验表明,脱硫副产物PFMS对高岭土模拟废水的除浊效率和模拟印染废水的脱色率能达到脱硫副产PFS和工业PFS的处理效果；在碱性条件中,脱硫副产物PFMS对实际焦化废水的COD去除率略高于脱硫副产PFS和工业PFS。更多还原

【Abstract】 This paper dealt with one two-stage flue gas desulfurization process, which was designed to reduce packed height of the absorbing tower and the dosage of oxidant. The combined process included iron-desulfurization stage and magnesia-desulfurization stage. The continuous experiments indicated that high desulfurization efficiencies were achieved and the byproducts of Mg-Fe composite flocculants (i.e. the serous fluid mixture of two stages) were acquired. Furthermore, the flocculation performances of PFMS and PFS were investigated.For the iron-stage of combined process, packing height and the absorption liquid temperature were intended to0.2m and15℃, respectively. The optimum inlet concentrations range of sulfur dioxide and liquid/gas ratio on desulfurization efficiencies were also investigated.The determination inlet concentrations range of sulfur dioxide and liquid/gas ratio on desulfurization efficiencies could contribute to the performances of the magnesium-stage of combined process, such as the desulfurization efficiencies and liquid-gas ratio.Selecting the right conditions for the continuous operations of the combined process, the desulfurization efficiency more than91%and PFMS were obtained. Compared with the iron desulfurization process, the packing height was reduced by0.8m to achieving similar desulfurization rate. Theoretical calculations showed that the cost of raw materials to produce1ton of polymerization by-product of Mg-Fe composite flocculant PFMS was reduced by20.85yuan RMB and that of oxidants was reduced by16.96yuan RMB.The kaolin simulated turbidity wastewater, direct fast black G simulated dyeing waste water wastewater and coking wastewater were used to evaluate the performances of PFMS, PFS and industrial solid PFS flocculation, respectively. The experimental results showed that the turbidity and color removal efficiency by the desulphurisation products PFMS were the same as the byproduct PFS and industrial PFS. And in alkaline conditions, the COD removal efficiencies by PFMS were higher than PFS and industrial PFS.更多还原