Fractal Geometry of Particle Aggregates Formed in Calcium Sulfite Slurry

The solid-liquid separation is an important operation for the regenerated slurry of dual-alkali FGD system, and calcium sulfite could predominate in particle aggregates of the slurry. The settling velocity of calcium sulfite particles is a key parameter for the solid-liquid separation design. However, the settling velocity predicted by Stokes' Law could be suitable only for a spherical aggregate, but not for the irregular one. In this work, fractal geometry was introduced in order to characterize highly irregular geometric shapes. The sizes of calcium sulfite particle aggregates were analyzed using a metallographic phase microscope and image analysis. The results showed that particle aggregates had fractal features. The fractal dimensions could reveal the characteristics of the aggregates' geometry and aggregation process. An exponential relation between the fractal dimension D2 and the particle size l was determined as AμlD2. According to fractal theory, a parameter can be used to modify Stokes settling velocity close to actual settling velocity. The results could be valuable for the design of solid-liquid separation processes.     

浅析低压无功补偿装置现状和发展

阐述了低压无功补偿装置的作用、控制方式、补偿方式、无功补偿控制器、电容投切开关电器,还介绍了装置的安装补偿方式以及装置的发展趋势。     

Experimental and Theoretical Studies on Desulfurization Efficiency of Dual-alkali FGD System in a RST Scrubber

The effects of operating parameters on desulfurization efficiency of a dual-alkali FGD process in a rotating-stream-tray (RST) scrubber are investigated. A dimensionless factor, e, is proposed in this study to predict desulfurization efficiency of this dual-alkali FGD system. e represents the desulfurization ability of a dual alkali FGD system, determined by five main operating parameters such as sodium ion concentration, ratio of absorbent flow rate to flue gas flow rate, pH value of absorbent solution, ratio of sulfate ion to total sulfur ion in absorbent solution, and sulfur dioxide concentration of inlet flue gas. The empirical expression for predicting desulfurization efficiency at different temperatures is obtained through the experimental study and theoretical calculation. It provides useful guide for engineering design.     

臭氧与生化组合处理印染废水研究

以CODCr去除率、B/C、臭氧消耗系数、臭氧消耗量等项目指标考察了臭氧与生化组合处理印染废水的工艺."生化 物化 O3"法处理出水的CODCr、色度指标可完全满足<纺织染整工业水排放物排放标准>(GB 4287-1992)的一级排放要求,而"O3 生化 物化"法处理出水的CODCr不能满足排放要求."生化 物化 O3"法不仅可以提高出水水质,且可以降低臭氧消耗量.     

广东阳江地区500 kV典型同塔双回杆塔防雷影响因素研究

雷击是造成输电线路跳闸的重要原因,广东阳江地区雷电活动频繁,对当地500kV输电线路的安全运行构成了严重威胁。鉴于此,以高雷击跳闸率的典型同塔双回杆塔为例,研究其影响因素,以进一步提高阳江地区500kV典型同塔双回杆塔防雷水平。     

焙烧温度对铈改性钛纳米管脱硝活性及理化特性的影响

铈改性钛纳米管是一种兼具良好脱硝活性、N2选择性和碱/碱土金属抗性的新型选择性催化还原脱硝催化剂，该文系统考察了焙烧温度对该催化剂脱硝活性和晶型结构、微观形貌及表面元素形态等理化特性的影响。实验结果表明，350℃和450℃焙烧所得样品的催化脱硝活性很高，在280~400℃之间均可维持80%以上的脱硝效率，而550℃焙烧所得样品的活性极低。通过 X 射线衍射、扫描电镜、透射电子显微镜、X 射线光电子能谱和比表面积(Brunauer-Emmett-Teller method，BET)法等表征发现，550℃焙烧所得样品的低活性与其管状结构被破坏和 Ce3+急剧减少等有关。因此，铈改性钛纳米管脱硝催化剂的焙烧温度不宜过高，且考虑到实际应用时温度常超过350℃，该催化剂的较佳焙烧温度为450℃。     

电石渣在大型热电机组烟气脱硫中的应用

介绍了新疆天业集团有限公司利用电石渣作为脱硫剂，在4×135MW大型热电机组上进行湿法烟气脱硫的运行情况，并提出了电石渣综合利用的循环经济模式。     

脱硫用电石渣浆液中硫化物去除工艺的对比研究

分别研究了空气催化氧化法、双氧水氧化法和漂白粉氧化法对脱硫用电石渣浆液中硫化物的去除效果。实验结果表明,在适当条件下,空气氧化法可在240 min内使硫化物的去除率达到80%,适量的双氧水和漂白粉能够使硫化物降至0.5 mg/L以下,去除率达到99%以上。在此基础上对比了3种工艺的经济成本:空气催化氧化法<漂白粉氧化法<双氧水氧化法。     

乙烯/乙烷分离用树脂型吸附剂的研究

制备和研究了用于乙烯/乙烷吸附分离的经改性的吸附剂——银离子交换树脂。在25℃、1atm下，银离子交换树脂S9对乙烯的平衡吸附容量为0.992 mmol·g-1, 乙烯/乙烷平衡吸附容量之比为3.56。25℃和75℃时，其吸附容量可恢复85%以上；105℃时，其吸附容量能完全恢复。由于这一吸附包含了能量不同的物理吸附和Л络合化学吸附, 平衡数据由含两个拟合参数的平衡等温吸附方程关联而得。通过综合考虑几个主要吸附特性，讨论了这些吸附剂在工业吸附过程中的应用潜力。     

Fenton氧化-PAM絮凝-A/O工艺处理甲基多巴生产废水

甲基多巴是一种治疗精神疾病的医药中间体,其生产废水具有色度高、有机污染物浓度高、难生物降解的特性.采用Fenton氧化-PAM絮凝-A/O工艺处理甲基多巴生产废水,具有显著的脱色效果和高效去除有机物的作用.工程实践表明,经该工艺处理后,CODCr去除率为82%,色度去除率达95%,出水满足GB 8978-1996三级标准.