低温等离子体技术脱除大气污染物的研究进展

随着人们对低温等离子体的不断深入了解,低温等离子体技术具有了更广阔的应用前景;利用低温等离子体技术治理大气污染也是目前很有吸引力和发展前景的技术.主要介绍了低温等离子体应用于大气污染治理的研究进展;分别讨论了低温等离子体在处理含氮氧化物工业废气、含硫工业废气、可挥发性有机污染物等方面的应用及其研究进展,并对低温等离子体脱除大气污染技术进行了展望.     

脉冲电晕等离子体技术脱除有害气体研究进展

概述了脉冲电晕等离子体技术脱除有害气体的研究现状,总结了影响等离子体技术脱除有害气体效率的主要因素及可能的脱除机理,讨论了用等离子体处理有害气体的研究方向及应用前景。     

专利技术

等离子体协同低温催化氧化NO脱除氮氧化物的方法 摘要：本发明是一种等离子体协同低温催化氧化NO脱除氮氧化物的方法,其特征在于将含NO、O2的待处理混合气体,空速控制在10000～60000h。之间,通过等离子体反应器活化,活化后的混合气通过装有锰基氧化物催化剂的固定床反应器,使混合气中的NOx在50—150℃条件下定量的氧化为NO2。本发明与现有技术相比,其工艺简洁,气体中CO、CO2、SO2杂质组分的不利影响小,处理NOx的浓度范围宽。较低温度下将NO定量的转化为NO2,进一步吸收利用,做到了资源化处理,且本发明具有能耗低、工艺简洁、占地面积小、无二次污染等特点。     

低温等离子体技术成功治理异味气体

日前，由山东派力迪环保工程有限公司与复旦大学共同研发的低温等离子体技术成功用于中石化齐鲁分公司腈纶厂异味气体处理工程。采用该技术处理后的恶臭气体二甲胺浓度小于0．88mg／m^3、N，N-二甲基甲酰胺小于6mg／m^3，均优于国家职业卫生标准，而耗电量仅为0．003kW／m^3。     

不同间隙条件下同轴型介质阻挡放电的模拟与实验研究

主要目的是为了研究气体间隙大小对介质阻挡放电脱除NO的影响.通过改变间隙大小,对反应器内静电场进行计算,用玻尔兹曼方程对反应器内的电子分布函数进行分析,并实验研究了间隙大小对NO脱除的影响.计算结果显示,随着气体间隙的减小,电场强度增大,导致折合场强增大,折合场强为200Td时离解速率和电子平均动能较100 Td时分别增加了116倍和2.2倍.实验结果表明,随着气体间隙减小,NO脱除效率升高.该研究对低温等离子体脱除氮氧化物的实际应用有一定的指导意义.     

低温等离子体技术在粉体表面处理中的应用

低温等离子体技术用于粉体表面处理具有工艺简单、无需溶剂、节能高效等特点.等离子体处理粉体表面利用的放电形式从真空放电到空气压力下的气体放电;范围从无机粉体的表面处理到纳米粉体、有机粉体的表面处理都有涉及.评述了国内外利用等离子体对无机粉体、有机粉体低温等离子体表面处理技术的进展.     

城市污水处理厂恶臭气体相关问题的探讨

本为论述了城市污水处理,一恶臭气体的产生原因,对产生环节、不同处理工艺的产生强度进行分析,结合本单位工作实践,论述了污水处理厂环境影响评价中恶臭污染源源强的核算以及预测方法,并探讨了环境影响评价中尚需改进的内容。     

低温等离子体技术处理废气的研究进展

低温等离子体技术是一个集物理、生物、化学和环境科学于一体的交叉综合性技术,它在处理废气方面具有能耗低、效率高和无二次污染等明显优点。简要介绍了氮氧化物(NO_x)、H_2S和挥发性有机化合物(VOCs)这3种污染气体的来源和危害,及介质阻挡放电法、低温等离子体协同技术和电晕放电法处理废气的原理及其对NO_x、H_2S和VOCs去除效率的影响条件,并展望了低温等离子体技术在废气处理领域的应用。     

低温等离子体对低密度聚乙烯材料的表面改性

用低温等离子体对 LDPE 进行表面改性,工作气体和处理时间对改性效果有重要影响。经等离子体处理后,LDPE 表面的接触角减小,表面能增加,尤其是其中的极性分量显著增加,粘接强度提高22—29倍。XPS 分析表明表面引进了极性基团。     

He和Ne均匀DBD聚对苯二甲酸乙二酯薄膜改性效果比较

相对于丝状放电模式,均匀介质阻挡放电(DBD)产生的等离子体功率密度适中,可以对材料表面进行更均匀的处理,在大规模工业应用上具有更为广阔的前景。本文用He和Ne均匀DBD产生的低温等离子体对聚对苯二甲酸乙二酯(PET)薄膜进行表面改性,通过接触角、表面能测量以及ATR-FTIR等手段研究了等离子体处理前后PET的表面特性,从能量密度角度比较了两种气体中均匀DBD处理后PET表面特性的变化规律,并对所得到结果进行分析。结果表明,两种气体均匀DBD改性后,PET薄膜表面水接触角随能量密度的增加而减小,表面能随能量密度的增加而增加,两者均在一定能量密度时达到饱和值;未达到饱和前,在相同能量密度下,Ne均匀DBD改性更迅速,但处理饱和后,两种均匀DBD的改性效果相差不大。因此,选择Ne作为工作气体可以提高生产效率,而选择He作为工作气体可以节约生产成本,两者均能得到良好的改性效果。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...