旋转填料床中络合铁脱硫富液的再生研究

发布时间：2018-05-19 03:14

本文选题：超重力 + 旋转填料床　；参考：《中北大学》2015年硕士论文

【摘要】：随着我国天然气净化、石油加工、煤气化等领域的快速发展，气体中H2S的脱除尤为重要，在众多脱硫技术中，络合铁脱硫技术以其高效、绿色等优点而备受瞩目。其中络合铁脱硫富液的再生好坏关乎着脱硫液能否正常循环利用，由于传统的再生设备通常为再生塔或再生槽，存在传质效果差、气液接触时间长等缺点，导致该技术在工业化应用中存在再生效率低、络合剂降解严重等缺点。本文对课题组前期开发的新型脱硫液配方比例进一步优化，提出旋转填料床再生脱硫富液的新工艺，并进行了深入研究。在络合铁脱硫液优化方面，通过考察复配络合剂比例、络合剂与铁比例、铁浓度对脱硫率和穿透硫容的影响，，筛选性能更加优良的脱硫液，并对其脱硫产物硫磺进行了XRD和SEM分析，结果表明该硫磺为斜方晶型，S元素含量高达81.25%。在研究脱硫液中氧气传质方面，本文应用双膜理论对超重力技术强化氧气在脱硫液中的传质机理进行分析，建立氧气传质的液相体积传质系数计算式，考察工艺参数对液相体积传质系数KLa的影响规律。结果表明，KLa随超重力因子、气量、液量和氧气体积分数的增大而增大，随温度的升高呈下降趋势；相近条件下，旋转填料床的KLa比传统曝气装置提高了1个数量级，其强化传质效果显著。利用旋转填料床强化氧气传质的优势，本文将其应用到络合铁脱硫富液的再生实验，确定实验范围内的适宜工艺参数。结果表明，再生率随超重力因子、气体流量的升高先增大后减小，随再生温度、氧气体积分数的升高而增大，随液体流量、Fe2+Ln-初始浓度的增大而减小。处理Fe2+Ln-初始浓度0.02mol/L的脱硫富液，再生率可达60%以上，经过两级再生，再生率达到90%以上，第二级再生率为71%，相对第一级提高了10%。相比传统曝气再生，超重机再生可有效缓解络合剂的降解。该再生技术可以有效提高再生效率、缓解络合剂的降解、缩小设备体积，发展前景广阔。
[Abstract]:With the rapid development of natural gas purification, petroleum processing, coal gasification and other fields in China, the removal of H2S in gas is particularly important. Among many desulfurization technologies, complex iron desulphurization technology has attracted much attention for its advantages of high efficiency and green. The regeneration of complex iron desulphurization rich liquid is related to whether the desulfurization liquid can be recycled normally. Because the traditional regeneration equipment is usually a regeneration tower or a regeneration tank, it has some shortcomings such as poor mass transfer effect, long gas-liquid contact time and so on. This technology has some disadvantages in industrial application, such as low regeneration efficiency and serious degradation of complexing agent. In this paper, the proportion of new desulphurization solution developed by our research group is further optimized, and a new technology of regenerating desulfurization and rich liquid in rotating packed bed is put forward and studied deeply. In the aspect of optimization of complex iron desulphurization solution, the effects of complexing agent ratio, complexing agent and iron ratio, iron concentration on desulphurization rate and penetration sulfur capacity were investigated to screen desulfurization solution with better performance. The desulfurization product sulfur was analyzed by XRD and SEM. The results showed that the sulfur content was as high as 81.25%. In the aspect of oxygen mass transfer in desulphurization solution, the mass transfer mechanism of oxygen enhanced by high gravity technology in desulfurization solution is analyzed by using double film theory, and the calculation formula of liquid volume mass transfer coefficient of oxygen mass transfer is established. The effect of process parameters on volume mass transfer coefficient (KLa) of liquid phase was investigated. The results show that the KLa of rotating packed bed increases by one order of magnitude compared with that of traditional aerator under similar conditions, and increases with the increase of hypergravity factor, gas volume, liquid content and oxygen volume fraction, and decreases with the increase of temperature. The effect of enhanced mass transfer is remarkable. Using the advantage of rotating packed bed to enhance oxygen mass transfer, this paper applies it to the regeneration experiment of complex iron desulphurization and rich liquid, and determines the appropriate technological parameters in the range of experiment. The results show that the regeneration rate increases first and then decreases with the increase of hypergravity factor, increases with the increase of regeneration temperature and oxygen volume fraction, and decreases with the increase of initial concentration of Fe2Ln-. The regeneration rate of Fe2 Ln- initial concentration 0.02mol/L can reach more than 60%. After two-stage regeneration, the regeneration rate is more than 90%, and the second stage regeneration rate is 71%, which is 10% higher than that of the first stage. Compared with traditional aeration regeneration, overweight machine regeneration can effectively alleviate the degradation of complexing agent. The regeneration technology can effectively improve the regeneration efficiency, alleviate the degradation of the complexing agent, reduce the volume of the equipment, and have a bright future.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ028.2

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