空分装置的操作瓶颈及整改措施

介绍因工艺空气冷却器塔盘故障,在分子筛吸附器切换时空气气流波动大、工艺空气冷却器工作效率下降,导致空气吸附温度升高甚至将水带入分子筛吸附器,引起相关工艺指标异常,给空分装置的操作带来风险。在经过系统的分析、摸索、判断、总结,并制定相应的操作方案,最终将这一操作瓶颈彻底解决。     

分子筛带水事故的原因及预防

简介了分子筛净化流程空分装置中空气冷却塔、分子筛纯化器的工作流程,针对一起分子筛带水事故,分析了分子筛纯化器的带水原因及危害,全面阐述了分子筛带水的处理方法及预防措施。     

空分装置水冷器泄漏事故及处理

因空分装置循环氮气压缩机第二段压缩后水冷器换热管泄漏,造成精馏系统冰堵事故,通过堵管焊接及增设排淋阀等方法进行处理,杜绝了此类事故再次发生。     

空分装置分子筛自控程序调试

介绍空分装置分子筛纯化系统工作原理,以及在调试过程中对分子筛自控程序进行的完善。并结合实际情况对程序进行修改,保证装置安全,低能耗运行。     

浅谈如何加快空分装置开车速度

根据目前空分装置的操作规程,结合对压缩机防喘振曲线和分子筛特性的研究,通过改变部分开车操作规程,加快空分装置开车速度.     

大型空分装置分子筛吸附器的国产化

上海焦化有限公司进口法国液空公司 (英文缩写ＡＬ,下同 )技术建设的 1 70 0 0ｍ3 /ｈ(Ｏ2 计 )空分装置 ,竣工投产 5年多来运行正常。该装置中的 2台分子筛吸附器由ＡＬ提供基础设计 ,中方完成施工图设计 ,并在上海完成加工制造。本文从设计和制造等方面进行分析 ,认为大型空分装置中分子筛吸附器实现完全国产化的条件是成熟的。1　结构ＡＬ分子筛吸附器的结构示意见图 1 ,为立式矮胖型容器 ,这与国内传统的卧式长型容器形成鲜明的区别。与卧式吸附器相比 ,ＡＬ分子筛吸附器有下列优点 :①通过吸附剂床层各处的气速均匀 ,阻力小 ;②采用中…     

空分装置分子筛再生加热器损坏浅析

一、情况简介山西化肥厂20800Nm~3/hO_2空分装置,是引进法国液空公司专利技术,具有工艺简单、操作方便和运行可靠等优点。空气的干燥和CO_2脱除在两套可互相切换的吸附器中进行,其中装填活性氧化铝和13X分子筛,再生是在减压和加热下进行的,热载体是冷     

分子筛吸附剂中毒后空分装置的安全生产分析

针对空分装置运行过程中出现分子筛吸附剂中毒的情况,阐述了一些必要的处理措施,以期能对分子筛的工作情况进行客观的判断分析,最终达到无被迫事故停车,延长吸附剂使用周期的目的。     

筛板喷射工况下的雾沫夹带

以空气／水为物系，对筛板上泡沫和喷射两种工况下的雾沫夹带进行了实验测量，依据喷射工况下雾沫夹带量随气液流量变化的规律，提出了喷射强度的概念及其定量表示，发现喷射工况存在一般喷射和强烈喷射两个状态，并对一般喷射状态下的雾沫夹带进行了新法关联。     

分子筛蒸汽加热器泄露事故及处理

空分装置分子筛系统因蒸汽加热器列管材质问题导致泄露,蒸汽进入污氮气侧使分子筛再生时无法达到指标,分子筛出口二氧化碳分析超标,造成冷箱内换热器"冰堵"系统负荷无法维持,影响了空分及后系统的正常运行,详细介绍了事故处理过程,原因分析,事故预防的具体方法和步骤。     

NaY分子筛专利分析

利用thomson innovation知识产权情报与协作平台,对关于NaY分子筛的国内外专利进行检索、分析。分析表明,NaY分子筛相关技术自2008年开始线性增长,大部分专利申请都集中在中国和美国,NaY分子筛及其制备方法以及分子筛用于制备催化剂都是申请人主要专利技术。     

Separation of Argon and Oxygen by Adsorption on a Titanosilicate Molecular Sieve

Abstract

A titanosilicate molecular sieve adsorbent, Ba-RPZ-3, was synthesized and tested for its use in the separation of O₂+Ar mixtures at room temperature. A clean resolution of both gases was achieved in pulse chromatographic experiments using a standard column (0.25″ OD, 3.5 grams of adsorbent). In another experiment, using a column containing 30 grams of adsorbent and a continuous O₂+Ar feed at 10 cm³/min, argon breakthrough was detected more than 5 minutes before the oxygen breakthrough, and the separation was sufficiently sensitive to achieve quantitative separation of mixtures with low argon content (5% Ar). Equilibrium adsorption isotherms and isosteric heats of adsorption for oxygen and argon were found to be almost identical at room temperature. The thermodynamic selectivity was found to be mildly in favor of oxygen (～1.1–1.2). However, the adsorption of oxygen was observed to be much faster than argon, indicating that the separation of the O₂+Ar mixtures was based on the sieving properties of the adsorbent and the difference in sizes of O₂ molecules and Ar atoms. This indicates that a suitably-oriented oxygen is physically smaller than argon, despite the fact that many references assume that oxygen is larger than argon.     

Separation of Methane and Nitrogen by Adsorption on Carbon Molecular Sieve

Abstract

Adsorption equilibrium of methane and nitrogen on CMS 3K from Takeda Corp. were gravimetrically measured at 298, 308, and 323 K and at pressures up to 2000 kPa. The most adsorbed gas is methane followed by nitrogen. The adsorption loading at 550 kPa and 308 K is 1.73 mol/kg for methane and 0.91 mol/kg for nitrogen. Experimental data were fitted with the multisite Langmuir model. Single component uptake of these gases at low pressures was used to determine the adsorption kinetics. Adsorption of nitrogen is much faster than methane, although this gas is preferentially adsorbed. The adsorption rate of both gases was controlled by a surface barrier resistance at the mouth of the micropore combined with micropore diffusion. Breakthrough curves of pure gases and their binary mixtures were measured at ambient temperature. A bi‐LDF (Linear Driving Force) model was used to predict the fixed‐bed behavior. Large differences in the adsorption kinetics were observed: at 308 K the LDF constant ratio was K_μ,N2 /K_μ,CH4 =133, although because of much higher adsorption of methane, the overall kinetic selectivity was 1.9 at 308 K. The data obtained in this work can be used for adsorption separation processes modeling for methane purification from nitrogen‐contaminated streams.     

空分装置分子筛加热器冷凝液的回收

随着清洁生产、节能降耗的实际需求,对空分分子筛加热器冷凝液进行回收显得尤为重要.目前国内大型空分装置分子筛均为2套,一开一备,当A、B两套同时加热时,冷凝液用同一根管线.将分子筛加热器冷凝液疏水器取消,在总管上加一冷凝液罐对冷凝液进行回收,易导致冷凝液流通不畅,存在较大的安全隐患.通过优化改造,既能解决安全隐患,又能回收直排的冷凝液,达到节能降耗的目的.     

Recent Advances in Molecular Sieve Unit Design for Air Separation Plants

Abstract

For various reasons interest in adsorption-based prepurification units has continued to increase in air separation industries. This has led to significant development efforts in this area with the objective of generating optimized designs rather than simply workable designs. Emphasis has been placed on the ability to optimize for both energy and capital cost. This paper presents the background to the design of these units. It shows how an extensive program of practical measurements made on a purpose-built large-scale test rig followed by detailed theoretical work to ensure correct interpretation of the information gathered has made it possible to understand this temperature swing adsorption process and at the same time to develop robust and confident designs.     

空分装置生产中几个异常现象原因分析

通过对大量数据的统计、对比、分析阐述了空分装置主换热器异常的现象、发展过程及原因;通过对分子筛床层阻力的计算、分析给予曾过水的分子筛以定性,指导了检修工作。