林德公司在华连中两大套空分设备

德国林德公司在华经营走势趋好 ,2 0 0 2年上半年在国内大型空分设备投标中连中两个大套 :(1) 2 0 0 2年 4月 ,中标马鞍山钢铁公司 4 30 0 0ｍ3 /ｈ空分设备 ,为内压缩流程。有关主要技术参数如下 :气氧 4 0 0 0 0ｍ3 /ｈ、纯度 99 6 %Ｏ2 、压力 2 6ＭＰａ,液氧 30 0 0ｍ3 /ｈ (折成气态 ,下同 ) ;中压氮气 2 5 0 0 0ｍ3 /ｈ、纯度≤ 5× 10 -6Ｏ2 、压力 2 1ＭＰａ ,低压氮气 2 0 0 0 0ｍ3 /ｈ、纯度≤ 5× 10 -6Ｏ2 、压力 0 9ＭＰａ ,液氮 80 0ｍ3 /ｈ ;液氩 1390ｍ3 /ｈ、气氩 4 0 0ｍ3 /ｈ、氩纯度 1× 10 -6Ｏ2 、 1× 10 -6Ｎ2 ,…     

柳钢15000m~3/h制氧机工程投建

据 2 0 0 2年 8月 2 3日《中国冶金报》照片新闻报道 :“日前柳州钢铁集团投资 1 4亿元建设一台 1 50 0 0ｍ3 /ｈ内压缩流程制氧机 ,计划 2 0 0 3年 3月建成投产。”据笔者了解 ,此套 1 50 0 0ｍ3 /ｈ空分设备 ,由中国空分设备公司提供技术及设备成套服务 ,主体空分设备由开封空分集团有限公司设计制造 ,主要技术参数如下 :氧气1 61 60ｍ3 /ｈ ,纯度≥ 99 8%Ｏ2 ,压力 2 5ＭＰａ (内压缩 ) ,液氧 1 50 0ｍ3 /ｈ (折成气态 ) ,纯度均≥ 99 8%Ｏ2 ;氮气1 50 0 0ｍ3 /ｈ ,压力氮 30 0ｍ3 /ｈ (0 45ＭＰａ) ,液氮 60 0ｍ3 /ｈ ,纯度均≤ 5× …     

氮气液化装置的扩容改造

针对化工生产连续性和空分装置启动周期长的特点 ,仪征化纤股份有限公司动力厂建有一套氮气液化及贮存、输送装置 ,作为空分装置故障的后备供氮手段。近 2 0年来 ,随着仪化公司的不断扩展和市场经济的逐步建立 ,动力厂紧紧围绕满足公司内部和扩大市场销售两个目标 ,对该套装置进行了多次扩容改造。使运行可靠性增强 ,产量增加 ,成本降低 ,市场竞争力加强 ,取得了明显的经济效益。1　原装置简介表 1　氮气液化装置主要设计性能参数项目设计值氮气液化量 70 0～ 10 0 0ｍ3 /ｈ原料氮气压力 1 6ＭＰａ循环制冷氮气量 70 0 0ｍ3 /ｈ循环氮气压力…     

川空低温液体贮运设备受酒泉卫星发射中心表彰

我国第一艘“神舟”号试验飞船 1999年 11月 2 0日安全升空 ,成为继前苏联、美国之后第三个掌握宇宙飞船技术的国家。 2 0 0 0年 9月 8日 ,发射场系统工程通过国家竣工验收。载人航天工程发射场系统建设总结表彰大会 ,2 0 0 0年 11月 2 6～ 2 7日在中国酒泉卫星发射中心举行 ,四川空分设备集团公司作为该发射场系统建设先进单位受到表彰 ,派员参加了表彰大会。因为川空提供的 5 0ｍ3、0 8ＭＰａ低温液体贮槽和 11ｍ3、0 8ＭＰａ低温液体槽车 ,在试验飞船发射过程中性能稳定 ,工作可靠。川空为酒泉卫星发射中心宇航员吸氧试验所用的 8 5ｍ3…     

杭氧开发2000m~3大型低温液体贮槽

杭氧集团公司空分一厂最近承接了为美国Ｐｒａｘａｉｒ (上海 )半导体公司提供大型粉末绝热 2 0 0 0ｍ3液氮贮槽和 670ｍ3液氧贮槽各 1台的设计和制造合同。这是继 1999年杭氧为Ｐｒａｘａｉｒ公司生产 4 2 5～ 13 0 0ｍ34台大型液体贮槽后的双方又一次合作 ,也是杭氧首次生产 2 0 0 0ｍ3大型液体贮槽。合同要求 ,贮槽按ＧＢ15 0、ＡＰＩ62 0、ＡＮＳＩ和ＰｒａｘａｉｒＧＳ 3 3、ＧＳ 3 8等相关标准规范设计和制造 ,产品将于 2 0 0 1年 12月交货 ,卖方提供贮槽交钥匙工程。近年来 ,杭氧大型低温液体贮槽生产发展很快 ,先后与德国Ｌｉｎｄｅ…     

杭氧新型“二万等级”中压氧透开发成功

20 0 2年 5月 2 8日 ,杭氧透平机械有限公司最新开发的2 0 0 0 0ｍ3 ｈＯ2 等级空分装置配套的氧气透平压缩机 ,在攀枝花新钢钒股份有限公司一次开车成功 ,并通过了 72小时考核。根据攀钢对设备的要求 ,该氧压机的设计流量为16 0 0 0ｍ3 /ｈ ,排气压力为 2 5ＭＰａ。该氧气透平压缩机主要工况参数为 :进气压力　96 6 6ｋＰａ (Ａ)、排气压力　 1 6 86 6ＭＰａ (Ａ)、出口流量　185 0 0ｍ3 ｈ、输出轴功率　 2 812ｋＷ。运行时 ,转子振动小于16 8μｍ。该氧气透平压缩机应用了国内外最新技术成果 ,采用双缸、四段、八级、一次增速的结构…     

液氮再冷凝装置的设计与验证

搭建了一个液氮零蒸发主动冷却的贮存测试系统,该系统的目标是针对一个日蒸发率为0.4%的10 m~3液氮贮槽实现液氮冷凝回收。首先,将贮槽中蒸发的冷氮气通到一个200 L的液氮杜瓦中,并通过该杜瓦顶部的GM制冷机,进行冷却和再液化,并对该杜瓦中的液氮液位进行测量,获得液化率。当200 L中的液氮杜瓦中的液氮完成液化后,通过切换阀门,并对杜瓦升压,将再液化的液氮泵入10 m~3的液氮贮槽中,恢复液氮贮槽中的液面,完成一次再冷凝。通过实验测试验证了该系统可以实现大于40 L/d的再液化率,能够满足该液氮贮槽的零蒸发要求。     

制氧工问题解答(四则)

问 :我厂有一台邯氧 1996年生产的 5 0ｍ3/ｈ空分设备 ,最近在启动制冷关阀后期 ,发现下塔压力不断下降 ,压力降到 0 4ＭＰａ还在继续往下降。把高压降低到 2 4ＭＰａ仍然不解决问题 ,氧纯度98% ,流量计坏了 ,液空、液氮、气氮都未分析过 ,下塔压力应当上升 ,怎么会不断下降 ?原因何在 ?如何解决 ?(秦皇岛××制氧厂读者问 )答 :据查膨胀机进、出口温度分别为 - 110℃、- 140℃ ,设备制冷尚属正常。这次启动 ,您们关阀速度没有接火候去关 (慢一些 ) ,导致下塔过冷。这种现象 ,原因很简单 ,是塔的冷量过剩了 ,液面不断升高 ,有一小部分液氧…     

液氮贮槽氧含量超标分析与排除

简介福建炼化林德气体有限责任公司两套40000 m3/h空分设备液氮后备系统工艺流程,针对在空分设备开/停车期间和液氮后备系统投用期间两个时段液氮贮槽氧含量超标故障,详细分析了原因,并介绍采取的措施。     

杭州川空通用设备有限公司试制的小型全低压空分设备顺利投产

ＫＤＯＮ - 170 / 40 0型全低压小型空分设备在张家港东南气体灌装有限公司建成并顺利开车投产。该设备是杭州川空通用设备有限公司依据多年制造、安装、调试小型空分设备的实践经验和空分前沿技术建成 ,具有节电、产量高的特点。为降低成本创出了新路子。该设备采用正流空气膨胀进上塔工艺 ,其主要运行指标如下 :加工空气量 10 3 0ｍ3/ｈ ,空压机排压 0 7ＭＰａ (Ｇ) ,氧气产量 190ｍ3/ｈ ,氧气纯度 99 6% ,氮气产量 65 0ｍ3/ｈ ,氮气纯度 99 9995 % ,电耗 0 69ｋＷｈ/ｍ3Ｏ2 (不含压氧 )。杭州川空通用设备有限公司提供该设备的系统设计…     

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.……     

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.……     

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 ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.