稀土抛光粉废粉对SO_2吸收性能的研究
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摘要
随着经济的快速发展,我国排放到大气中的二氧化硫使大气环境质量恶化,酸雨的危害加重,SO2的排放对人类的生存环境产生了极大的威胁。本文分析了我国大气污染的现状、SO2的危害等;对各类烟气脱硫技术的发展概况进行了综述并分析比较了各种脱硫方法的优缺点。
     目前,稀土抛光粉废粉基本作为固体废物进行堆放,没有进行有效地管理及利用,造成周边环境的污染。在研究它的可资源化利用特性之前,一定要对其可能产生的危害进行分析。本文研究了稀土抛光粉废粉可资源化利用及污染特性,结果表明:该废粉中主要含有稀土、氟等元素,其浸出毒性、腐蚀性远小于国家标准要求,也不具备反应性及易燃性,不含有放射性物质。
     本文对抛光粉废粉的脱硫性能进行了试验研究。主要研究了空间速度、温度、二氧化硫浓度、氧气等因素对抛光粉废粉脱硫性能的影响。得出结论:随空间速度的增大,穿透时间缩短,脱硫效率降低,单位质量脱硫剂的烟气处理量也随之减少;反应温度升高,穿透时间增长,脱硫剂的硫容及脱硫效率也相应增大;在硫化反应初期,SO2浓度对反应速率的影响是显著的,随着SO2浓度的增高,硫化反应速率增大,穿透时间缩短,脱硫效率降低,脱硫剂失活越快,反应更早进入减速期。而在硫化反应速率减缓区域,SO2浓度对其影响并不明显;烟气中的O2参与了硫化反应;还研究了抛光粉废粉再生后的脱硫情况。对不同温度和不同SO2浓度下的试验结果进行拟合得到反应的本征动力学方程为:这对进一步的流程开发和反应器设计有指导意义。
With the economy development fast, SO2 gas is emitting to atmosphere and then deteriorates environment, the harm of acid rain has aggravated. The circumstance of the man has suffered great threaten by draining off SO2. In this paper, the polluted current situation of SO2, the hazardous of SO2, the development and the application of desulfurization technologys are analyzed. Advantages and disadvantages of all kinds of desulfurizing technologys were analysed.
     At present, waste rare earth polishing powder are being piled up as waste solid, which are't managed and made use of effectively. A mass of solid wastes is exhausted. These wastes should be analyzed before using. Refuse utilization and pollution characteristics of the waste rare earth polishing powder were investigated in the paper. The results showed that it contains rare earth, fluorine and other elements. Extraction toxicity and corrosion test results showed that the test data were far lower than the level required by national standards. The test results had also shown that it had not reactivity, ignitability and radioactivity.
     The following Influencing factors are studied about desulfuration by waste polishing powder:space velocity of smoke, adsorption temperature, concentration of SO2 in the smoke and O2. Conclusions are following:Desulfuration's efficiency descends with space velocity of smoke is enlarging.The amount of treated flue gas per gram desulfurizer also decreases. The sulful capacity and desulfurization efficiency increased with the increase of temperature. The sulphuration reaction rate went up rapidly at first and then lowered slowly, and it changed greatly with the concentration of SO2 at first and then nearly was not influenced by the concentration. Breakthrough time shortens with the increase of SO2 concentration. O2 in the flue gas participated in the sulfated reaction.The experiments on desulfurization of the regenerated waste polishing powder had been studied. The intrinsic dynamic reaction equation was obtained through analysis and statistic of experimental results at different temperatures and different SO2 concentrations, The data from these experiments are conducted to make intrinsic chemical kinetics analysis to get the relevant kinetic parameters, which is the guidance for further process development.
引文
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