超滤-反渗透膜组合工艺处理电厂循环排污水

本文详细介绍了北京京丰天然气燃机联合循环电厂使用超滤-反渗透膜组合工艺处理循环水排污水。循环水排污水回用系统的最大问题是反渗透膜的污染控制问题。因为循环水排污水相对水质较差，因此对预处理技术要求较高，采用超滤膜作为预处理系统，能够很好地解决这个问题。北京京丰热电厂通过长时间的工业化运行，证明了在处理回用循环水排污水过程中，超滤作为反渗透预处理系统的可行性，也积累了该工艺处理循环水排污水用于电厂循环补充水和锅炉补给水方面的应用经验．     

超滤技术处理丙烯腈厂循环水排污水的试验研究

经过反渗透除盐处理的丙烯腈厂循环水排污水可以作为锅炉的补给水,但是丙烯腈厂循环水排污水进入反渗透系统前必须经过严格的预处理。提出采用超滤技术作为反渗透除盐的预处理方案,并通过现场中试试验证明,采用超滤技术处理丙烯腈厂循环水排污水的产水能够满足反渗透除盐系统进水的水质要求。     

膜技术在循环冷却排污水回用中的应用

在电厂循环冷却系统排污水回用中,采用膜技术(超滤一反渗透组合工艺)对循环排污水去浊除盐.通过现场中试试验,确定了膜法回用循环冷却排污水的可行性和回用系统的工艺参数.试验结果表明:超滤产水CODMn0.52～1.12 mg/L,浊度0.047～0.145 NTU,SDI15≤1.2,余氯＜0.04 mg/L,出水水质完全可以满足反渗透进水要求;反渗透系统的脱盐率＞98.5%,出水电导率11.4～13.1μS/cm.     

火电厂中水回用工程的设计与运行

根据山西某电厂循环冷却排污水水质,利用集成膜系统(连续微滤 反渗透)处理该废水,以微涡流絮凝和高效纤维过滤作为微滤系统的预处理,后采用纤维过滤出水与反渗透出水混合的混水工艺,处理出水作为电厂循环冷却系统补给水.运行结果表明,出水各项指标均能满足回用要求,能较好解决电厂用水问题,达到水资源的循环再生利用.     

膜法处理电厂循环冷却系统排污水的工艺研究

对采用超滤、反渗透技术处理电厂循环冷却排污水并回用的工艺进行了中试研究。结果表明．超滤产水SDI15〈1．5、浊度〈0．15 NTU、余氯质量浓度〈0．10mg／L,出水水质能够满足反渗透膜进水要求;反渗透膜脱盐率〉99％。该工艺开辟了一个循环冷却排污水处理的新途径,应用前景广阔。     

内外压式超滤组件在火电厂循环冷却排污水处理中的应用比较

分别选取一种内压式和一种外压式中空纤维超滤膜组件,从超滤膜材质、运行参数和出水水质等方面对这2种组件在火电厂循环冷却排污水反渗透预处理中的应用进行了中试规模的研究。结果表明:外压式组件在跨膜压差和膜通量上要优于外压式,而2种组件出水水质基本一致。因此,外压式膜组件更适合于火电厂循环冷却排污水反渗透预处理的工艺。     

双膜法工艺处理回用焦化废水的中试研究

采用双膜法工艺处理回用焦化废水,以混凝沉淀系统作为预处理工艺,保证超滤进水水质。实验周期内,超滤产水水质始终满足SDI15<3、浊度<0.2 NTU和余氯<0.05 mg/L,符合反渗透进水水质要求;反渗透系统产水COD<5 mg/L,电导率稳定在30μS/cm左右,水质指标符合中试预期;对超滤膜元件进行2次化学清洗,通量可基本恢复到初始值;中试期间,反渗透系统一直保持高效稳定运行。     

预处理+双膜法工艺在煤制烯烃循环水系统排污水处理中的应用

介绍了"预处理+超滤+反渗透"组合工艺的特点及工艺流程,该装置以循环水系统排污和塔底排污水为主要处理对象,通过对高含盐量、高碱度和硬度来水深度处理,产水达到工业回用水要求,作为循环水系统补水回收利用。     

煤制气废水处理及回用工程设计

针对煤制气废水成分复杂,水量、水质波动性大,硫化物、NH3-N浓度高,碳氮质量比较低的特点,废水处理站采用预处理-两级A/O-臭氧氧化-曝气生物滤池组合工艺,回用水站采用预处理-超滤-反渗透组合工艺,对废水进行处理及回用。工程运行结果表明,系统运行稳定、出水水质达到设计指标,满足循环冷却水系统补充水水质要求。     

电厂膜法海水淡化工程预处理成本及工艺选择

针对原海水水质情况,拟定了细砂过滤器工艺和超滤膜工艺2条海水反渗透预处理工艺路线,分析了原海水水质、投资成本、运行费用和产水水质等各方面因素。结果表明,相比超滤工艺,细砂过滤器投资成本节约57.7%,运行成本节约63%,细砂过滤器产水水质能满足海水反渗透膜的进水要求,超滤产水水质优于细砂过滤器产水水质。综合考虑,采用细砂过滤器作为海水反渗透的预处理工艺。本工程预处理工艺路线的选择,可为类似膜法海水淡化工程预处理工艺选型和设计提供参考。     

底座连接口特征参数对显示器后壳注塑质量的影响分析

在Moldflow分析软件的基础上,对显示器后壳进行仿真研究,以翘曲变形量为质量指标,结合控制变量法进行单因素变动实验,保持注射工艺参数不变,研究显示器后壳底座连接口对制品翘曲变形的影响.对数据进行图表分析,结果表明显示器后壳尺寸定位68.58 cm(27英寸)时,底座连接口选用圆形,连接口位置距离底边26 mm,尺寸...     

The role of the symmetry and the flexibility of the anion on the characteristics of the nanostructures and the viscosities of ionic liquids☆

The transport properties of ionic liquids (ILs) are crucial properties in view of their applications in electrochem-ical devices. One of the most important advantages of ILs is that their chemical–physical properties and conse-quently their bulk performances can be well tuned by optimizing the chemical structures of their ions. This will require elucidating the structural features of the ions that fundamentally determine the characteristics of the nanostructures and the viscosities of ILs. Here we showed for the first time that the“rigidity”, the order, and the compactness of the three-dimensional ionic networks generated by the anions and the cation head groups determine the formation and the sizes of the nanostructures in the apolar domains of ILs. We also found that the properties of ionic networks are governed by the conformational flexibility and the symmetry of the anion and/or the cation head group. The thermal stability of the nanostructures of ILs was shown to be con-trolled by the sensitivity of the conformational equilibrium of the anion to the change of temperature. We showed that the viscosity of ILs is strongly related to the symmetry and the flexibility of the constitute ions rather than to the size of the nanostructures of ILs. Therefore, the characteristics of the nanostructures and the viscosities of ILs, especially the thermal stability of the nanostructures, can be fine-tuned by tailoring the symmetry and the conformational flexibility of the anion.     

Investigation of the effects of fatty acids on the compressive strength of the concrete and the grindability of the cement

In cement industry, a great energy consumption has been observed during grinding of clinker. To reduce this consumption, some waste products have been used as grinding aids.In this investigation, the effects of sunflower oil (SO), oleic acid (OA), stearic acid (SA), myristic acid (MA) and lauric acid (LA) on the fineness and strength of the cement have been examined. These aids were added into clinker in certain ratios based on the cement clinker weight and the grinding has been done for a definite time at the same condition.All of the fatty acids used increased the fineness as compared with the cement without the grinding additives. SO and OA decreased the strength significantly, LA decreased it to a lesser extent and SA increased it definitely according to the common cement. But MA did not alter the strength of the cement as much as SA. In addition, the covering of the balls influences the grinding of cement clinker unfavourably.     

浅谈设备的性能与操作对胎面压出质量的影响

简要介绍了胎面压出的工作原理及工艺过程，对设备的配置及操作对胎面压出质量的影响进行了分析，并对压出过程中常见的质量缺陷、造成的原因以及解决措施提出了自己的见解。     

关于建立火炸药安全数据库的探讨

由反映火炸药及其制品的危险性能和用于对它们的生产、储运系统进行安全评价数学模型出发,探讨了如何建立一个全面、实用的火炸药安全评估数据库。通过对此数据库内容、数据表示方法、数据搜索方法以及建立步骤的讨论,明确了该数据库的使用对象和主要功能。     

The effect of the length of the oxyethylene chain on the conductivity of the polyurethaneurea electrolyte

Polyurethaneureas (PUU), which were synthesized from 4,4′-diphenylmethane diisocyanate (MDI), poly(ethylene glycol) (PEG), and 3,5-diaminobanzoic acid (DABA), were used as polyelectrolytes in this study. Differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR) were used to monitor the effect of the various kinds of PEG on the changes in morphology of PUU electrolytes corresponding to the concentration of lithium perchlorate (LiClO₄) dopants. The results of DSC and FT-IR indicate the Li⁺ ions coordinate with the soft and hard segments. Additionally, the crystallinity of the PEG soft segment and the ordered hydrogen-bonded urea carbonyl groups decreased with increasing salt concentration. Impedance spectroscopy (IS) measurements show that the PUU electrolyte with the high phase separation degree has the high ionic conductivity. The hard-segment T_g and the soft-segment T_m influence the conductivity behavior of polyelectrolytes with increasing measurement temperature.     

煤粉流动性对GSP气化炉气力输送的影响研究

针对GSP气化装置煤粉气力输送在试车阶段出现的煤粉锁斗下料不畅、发料罐输送性能不佳等问题,从原料煤性质和工业装置的改进方面出发,通过煤粉的流动性参数的测量与研究,分析出现上述工程问题可能的内在原因,并提出工业装置改进方法,为保证GSP煤粉气力输送工业装置的正常运行提供解决办法。