脱硫石膏在水泥-粉煤灰-矿渣粉复合胶凝体系普通干混砂浆中的应用研究

本文针对水泥-粉煤灰-矿渣粉复合胶凝体系配制的干混砂浆早期和后期强度较低的难题,选取粉煤灰、矿渣粉两者单掺或复掺取代水泥率为70%的复合胶凝体系,研究脱硫石膏(FGD)对该体系活性的改进效果.结果表明:掺加一定量的FGD对水泥-粉煤灰-矿渣粉复合胶凝体系活性的改进效果明显,能明显提高该体系的早期和后期抗压强度和拉伸粘结强度,且能使胶凝体系的收缩降低10%以上;通过XRD和SEM、孔结构微观分析表明:FGD对粉煤灰或矿渣粉起到了硫酸盐和碱性激发的双重作用,且对水泥水化也有一定的促进作用,胶凝体系水化产物改善了浆体内部结构,使浆体中空隙大大降低.     

我国在化工、生物与热动力微系统领域的研究进展

简述了我国在化工、生物与热动力微系统及相关微制造技术的最新研究进展.文中指出由于具有小型化、强化传质、传热的优点,微反应器被广泛应用在化学反应中,这些反应主要包括液相、气相反应和纳米颗粒合成.微反应技术适用于一些高危反应或利用传统方法合成较困难或成本和价值非常高的反应.微流控技术应用于生物分析与测试领域也已经取得了长足...     

用膜蒸馏方法制备高Alc含量的高浓度聚合氯化铝

A direct contact membrane distillation (DCMD) process was applied to prepare high concentration polyaluminum chloride (PACl) with high Alc content. The changes in total Al concentration (AlT) and Al species distribution were investigated. The results showed that AlT increased but the flux decreased with operating time during the DCMD process. The Alc content increased from 65% to 81% while the Alb content decreased from 34% to 18%, and the Ala content was almost 1% in the process. 2.1 mol•L1 PACl with 81% Alc was successfully prepared by DCMD method. Thus the DCMD is an effective method for preparing high concentration PACl with high Alc content.     

搅拌槽内絮凝动力学研究

采用激光粒度仪在线测定并研究了搅拌槽内聚丙烯酰胺与磷矿酸解渣的絮凝动力学。考察了不同浓度的酸解液，絮凝剂加入量，温度，酸解渣原始平均粒径和搅拌强度对絮凝动力学影响。在实验研究范围，絮凝初始速度随温度升高，絮凝剂加入量及搅拌强度的增加而提高，但随着酸解液的粘度增加和酸解渣原始平均粒径的增大而降低，体系中存在最佳的絮凝剂加入量。通过酸解渣的电泳试验，用自合成的阴离子，阳离子改性絮凝剂以及非离子型絮凝剂与酸解渣的絮凝试验发现，在中性的水中，酸解渣与不同荷电类型的絮凝剂的絮凝速度大小依次为：阳离子型＞非离子型＞阴离子型。而在磷酸酸解料浆中絮凝速度与絮凝剂的荷电类型无关。磷矿酸解渣与聚丙酰胺絮凝剂的作用主要表现为架桥机理。     

八碳烯分离工艺的研究

从能量综合集成的角度提出了八碳烯精馏分离工艺 ,对所提流程进行了优化模拟计算及分析 ,为八碳烯分离工艺的施工设计提供了充分的依据。投产情况表明 ,该研究改变了八碳烯的生产现状 ,使得八碳烯生产的经济效益显著提高     

纳米吸附剂在卷烟降焦中的应用研究

介绍了合成纳米材料应用于香烟过滤嘴降低卷烟焦油量的研究。将纳米吸附剂施加于过滤嘴棒中 ,可提高嘴棒的吸附、过滤效率。本研究中利用自制的的纳米吸附剂可降低卷烟焦油量 4.4mg/支。     

V2O5-WO3-MoO3/TiO2催化剂用于NH3选择性还原减排NOx的性能（英文）

The V2O5-WO3-MoO3/TiO2 honeycomb catalyst was prepared with industrial grade chemicals. The structural and physico-chemical properties were analyzed with X-ray diffraction (XRD), scanning electron micrograph (SEM) and mercury porosimetry. The NOx conversion and durability were investigated on a pilot plant test set under the actual operational conditions of a coal fired boiler. The catalyst monolith had good formability with mass percentage of V:W:Mo:TiO2 :fiber glass= 1:4.5:4.5:72:18. Vanadium, tungsten and molybdenum species were highly dispersed on anatase TiO2 without causing the transformation of anatase TiO2 to rutile by calcining under a current of air at 450℃ for 4.5 h, but there were some degrees of crystal distortion. The catalyst particle sizes were almost uniform with close pile-up and the pore structure was regular with complete macro-pore formation and large specific surface area. The NOx conversion was sensitive to temperature but nearly insensitive to NH3 . The catalyst showed strong adaptability to NOx concentration with activity above 80% in the range of 615-1640 mg·m-3 . Within the range of 720-8640 h continuous operation, the NOx conversion dropped at a rate of about 1% reduction per 600 h.     

燃煤电厂真实烟气条件下SCR催化剂脱硝性能

制备了具有工业应用价值的V₂O₅/TiO₂负载WO₃与MoO₃的蜂窝状SCR催化剂,并在某燃煤电厂烟气环境下,对其催化性能进行了测试,结果表明:增大催化剂体积能够提高脱硝效率,但活性增量逐步下降,当脱硝效率达到80%以上时,继续增大催化剂体积其活性提高不显著。催化剂的脱硝活性随着积灰时间的延长而降低,脱硝系统运行4 h后,催化剂脱硝活性减少9.4%。在燃煤电厂尾气飞灰浓度约为0.031 kg·m^-3环境下,为满足尾气中NO_x浓度排放要求(<200 mg·m^-3),每连续运行6 h需进行一次吹灰。催化剂的脱硝性能随着运行时间的延长,先急剧下降,后缓慢降低。在连续运行48~168 h范围内,脱硝活性下降值小于1%,SO₂氧化率下降值小于0.1%。在12个月内,平均每连续运行700 h,脱硝活性降低1%。     

DSC固化点法测定石蜡的熔点

用降温DSC曲线研究了石蜡的液-固相转变,取DSC曲线上石蜡冷却固化放热峰前沿切线与基线延长线的交点为固化点,即所谓熔点。结果表明,与现行方法比较,该DSC法方便、准确,有很好的重复性和精确度。     

高回弹、低密度环保泡沫用改性MDI的合成及其对制品性能的影响

采用低不饱和度、高相对分子质量、高活性聚醚多元醇,反应型增硬剂,反应型开孔剂和MDI型异氰酸酯为原料,研制出一种用于制备高回弹、低密度环保型泡沫的改性MDI,解决了当前改性MDI的模塑泡密度难以低于45kg/m3的技术问题。此改性MDI制备的高回弹泡沫在保证制品良好回弹性和硬度的前提下,密度最低可以降至38kg/m3。