超重力磷酸钠法烟气脱硫技术研究
发布时间：2018-07-30 06:52
【摘要】：本文综述了湿法烟气脱硫技术及设备的研究现状。通过对比几种典型的湿法烟气脱硫工艺及其脱硫剂的研究和应用情况，指出磷酸钠缓冲溶液具有物理化学性质稳定，不会降解变质，损耗低，且廉价易得，脱硫率高等优势，作为湿式可再生脱硫剂最具有应用潜力。湿法烟气脱硫设备的改进和研发虽然取得了一定的研究成果，但仍存在设备体积庞大、传质效率低、氧化副反应严重、结垢堵塞、运行成本高等问题，指出了旋转填料床具有很高的开发应用价值，，开发了新型的多级错流旋转填料床结构，并将其作为吸收设备。进行了超重力磷酸钠法烟气脱硫的理论和实验研究，为旋转填料床烟气脱硫的工业化应用提供理论依据和实验数据。 在脱硫理论方面，计算了磷酸钠缓冲溶液的饱和脱硫容量，并对其进行了实验验证，理论值与实验值的平均相对偏差不超过5%。饱和脱硫容量随pSO2、初始pH值和CP的升高而增大。初始pH为7时，Cp=1mol/L的饱和脱硫容量在25g/L以上，是水吸收SO2的60倍左右。 在磷酸钠脱硫富液抗氧化性方面，利用自制的鼓泡反应装置，采用动力学方法，设计正交实验，测定了亚硫酸钠在磷酸钠缓冲溶液中的氧化速率，比较了各因素对磷酸钠富液中亚硫酸钠氧化速率的影响。结果表明，各因素对磷酸钠脱硫富液中亚硫酸钠氧化速率影响的显著性顺序为：C(Na2SO3)CPpHTG；在实验操作范围内，亚硫酸钠氧化速率为0.00116~0.01875mol/(L·h)。在C(Na2SO3)=10g/L，G=150L/h，pH=7，T=35°C的条件下，磷酸浓度为1mol/L时亚硫酸钠的氧化速率是无磷酸时的54.3%，表观活化能Ea=48.48kJ/mol，是无磷酸钠存在时表观活化能的23.4倍，说明磷酸钠吸收剂能显著降低亚硫酸钠的氧化速率，磷酸钠脱硫富液具有很好地抗氧化性能，能够有效地减少硫酸钠的积累和再生过程吸收剂的损耗。 在多级错流床烟气脱硫工艺方面，考察了超重力因子β、吸收液pH值、液气比L/G、入口SO2浓度C1等工艺参数对脱硫率η的影响，并与水吸收SO2的传质性能进行对比。结果表明，在CP=1mol/L、pH≈7、C1=2831mg/m3、u=1.5m/s、β=50、L/G=2L/m3的条件下，仅下方床层进液时脱硫率η为82%，而两床层等量进液时的脱硫率η为97%，出口SO2浓度为85mg/m3，满足国家新的排放标准。当进一步提高液气比L/G或超重力因子β时，出口SO2浓度可低于50mg/m3，满足重点地区的排放标准。磷酸钠缓冲溶液能够适应较宽的SO2浓度范围。
[Abstract]:The research status of wet flue gas desulfurization (WFGD) technology and equipment is reviewed in this paper. By comparing several typical wet flue gas desulfurization processes and their application, it is pointed out that sodium phosphate buffer solution has the advantages of stable physical and chemical properties, no degradation and deterioration, low loss, low cost and high desulfurization rate. As a wet renewable desulfurization agent, it has the most application potential. Although the improvement and development of wet flue gas desulfurization equipment has made some achievements, there are still some problems such as large volume of equipment, low efficiency of mass transfer, serious side effects of oxidation, fouling and blockage, high operating cost, etc. It is pointed out that rotating packed bed is of high value in development and application. A new structure of multi-stage cross-flow rotating packed bed is developed and used as absorption equipment. The theoretical and experimental study on flue gas desulfurization by high gravity sodium phosphate method is carried out, which provides theoretical basis and experimental data for the industrial application of flue gas desulfurization in rotating packed bed. In terms of desulfurization theory, the saturated desulfurization capacity of sodium phosphate buffer solution was calculated and verified experimentally. The average relative deviation between the theoretical value and the experimental value was less than 5%. The saturated desulfurization capacity increases with the increase of pSO2, initial pH and CP. The saturated desulphurization capacity of 1 mol / L CpN at initial pH 7 is more than 25g/L, which is about 60 times as much as the absorption of SO2 by water. The oxidation rate of sodium sulfite in sodium phosphate buffer solution was determined by means of a self-made bubbling reaction device and orthogonal experiment. The effects of various factors on the oxidation rate of sodium phosphate rich sodium sulfite were compared. The results show that the order of influence of various factors on the oxidation rate of sodium sulfite rich in sodium phosphate desulfurization solution is in the order of: C (Na2SO3) CPpHTG, and in the range of experimental operation, the oxidation rate of sodium sulfite is 0.00116~0.01875mol/ (L h). Under the condition of C (Na2SO3) 10 g / L ~ (-1) G ~ (-1) pH = 7 ~ (7) T ~ (-1) T ~ (35 掳C), the oxidation rate of sodium sulfite is 54.3 when the concentration of phosphoric acid is 1mol/L, and the apparent activation energy is 48.48 kJ / mol / L, which is 23.4 times of the apparent activation energy in the absence of sodium phosphate, which indicates that sodium phosphate absorbent can significantly reduce the oxidation rate of sodium sulfite. The rich solution of sodium phosphate desulphurization has good oxidation resistance and can effectively reduce the accumulation of sodium sulfate and the loss of absorbent in regeneration process. In the multi-stage cross-flow bed flue gas desulphurization process, the effects of high gravity factor 尾, pH value of absorbent liquid, ratio of liquid to gas L / G, inlet SO2 concentration C1 on the desulfurization rate 畏 were investigated, and the mass transfer properties of SO2 absorbed by water were compared. The results show that under the conditions of pH 鈮
本文编号：2154194
[Abstract]:The research status of wet flue gas desulfurization (WFGD) technology and equipment is reviewed in this paper. By comparing several typical wet flue gas desulfurization processes and their application, it is pointed out that sodium phosphate buffer solution has the advantages of stable physical and chemical properties, no degradation and deterioration, low loss, low cost and high desulfurization rate. As a wet renewable desulfurization agent, it has the most application potential. Although the improvement and development of wet flue gas desulfurization equipment has made some achievements, there are still some problems such as large volume of equipment, low efficiency of mass transfer, serious side effects of oxidation, fouling and blockage, high operating cost, etc. It is pointed out that rotating packed bed is of high value in development and application. A new structure of multi-stage cross-flow rotating packed bed is developed and used as absorption equipment. The theoretical and experimental study on flue gas desulfurization by high gravity sodium phosphate method is carried out, which provides theoretical basis and experimental data for the industrial application of flue gas desulfurization in rotating packed bed. In terms of desulfurization theory, the saturated desulfurization capacity of sodium phosphate buffer solution was calculated and verified experimentally. The average relative deviation between the theoretical value and the experimental value was less than 5%. The saturated desulfurization capacity increases with the increase of pSO2, initial pH and CP. The saturated desulphurization capacity of 1 mol / L CpN at initial pH 7 is more than 25g/L, which is about 60 times as much as the absorption of SO2 by water. The oxidation rate of sodium sulfite in sodium phosphate buffer solution was determined by means of a self-made bubbling reaction device and orthogonal experiment. The effects of various factors on the oxidation rate of sodium phosphate rich sodium sulfite were compared. The results show that the order of influence of various factors on the oxidation rate of sodium sulfite rich in sodium phosphate desulfurization solution is in the order of: C (Na2SO3) CPpHTG, and in the range of experimental operation, the oxidation rate of sodium sulfite is 0.00116~0.01875mol/ (L h). Under the condition of C (Na2SO3) 10 g / L ~ (-1) G ~ (-1) pH = 7 ~ (7) T ~ (-1) T ~ (35 掳C), the oxidation rate of sodium sulfite is 54.3 when the concentration of phosphoric acid is 1mol/L, and the apparent activation energy is 48.48 kJ / mol / L, which is 23.4 times of the apparent activation energy in the absence of sodium phosphate, which indicates that sodium phosphate absorbent can significantly reduce the oxidation rate of sodium sulfite. The rich solution of sodium phosphate desulphurization has good oxidation resistance and can effectively reduce the accumulation of sodium sulfate and the loss of absorbent in regeneration process. In the multi-stage cross-flow bed flue gas desulphurization process, the effects of high gravity factor 尾, pH value of absorbent liquid, ratio of liquid to gas L / G, inlet SO2 concentration C1 on the desulfurization rate 畏 were investigated, and the mass transfer properties of SO2 absorbed by water were compared. The results show that under the conditions of pH 鈮
本文编号：2154194
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