RV-L型变压吸附制氮设备在聚酯行业的应用

介绍该设备的特点及在聚酯生产上的应用。它摒弃变压吸附普遍采用的上、下等势均压,而采用上部等势均压,中、下部交叉不等势均压的方式,充分利用吸收塔内的分子筛,能将氮气回收率提高9.5%~45%,生产高纯氮时空氮比可达到7.1:1。液氮气化成本是变压吸附的6.9倍(99%纯度)和2.3倍(99.999%纯度)。     

变压吸附制氮性能主要影响参数的研究

介绍了变压吸附制氮技术的优点、原理方法及工艺流程,实验研究了吸附压力、吸附解吸时间、产品流量等主要工艺参数对变压吸附制氮装置性能的影响,最后得出实验装置的最佳工艺条件为:吸附压力0.8 MPa,吸附解吸时间54 s,均压时间4 s,产品气出气流量7 m3/h。此时,实验装置制得的产品氮气体积分数最稳定,平均体积分数98%以上,回收率在40%左右。     

变压吸附制氮装置用于工业生产中的惰性保护

简要介绍变压吸附制氮技术的基本原理、变压吸附制氮装置以及用于工业生产中的惰性保护     

变压吸附分离技术在氮气生产中的应用

分析了变压吸附气体分离技术制取氮气的原理、工艺流程,比较了变压吸附制氮与其他制氮方法的优点,并且就变压吸附制氮装置选型时注意事项和装备进行了介绍,在2000m3(标)/h能力范围内,比深冷更具吸引力。     

碳分子筛分离空气制氮探讨

本文简要地介绍了碳分子筛变压吸附空分制氮的基本原理、工艺流程、变压吸附程序、制氮能力和装置特点等。并指出所制取的富氮气纯度高,可作为中性保护气体用于各工业部门。本装置对于没有制氧站的中小型工厂和有关部门的用氮,提供了一种节能、经济、安全和方便的新氮原。     

变压吸附制氮装置在氯碱行业中的应用

论述了变压吸附制氮技术的基本原理，并与深冷制氮技术进行对比及变压吸附制氮装置在氯碱行业中应用情况。     

均压方式对微型变压吸附制氧装置的影响

采用两塔变压吸附制氧实验装置研究了上下均压、交叉均压、下均压、上均压等4种方式对制氧效果和能耗的影响。结果表明,采用均压方式制氧能提高制氧效果,上均压方式、上下均压方式能显著提高排氧浓度,且最高排气O2质量分数超过90%;采用均压方式制氧节能效果明显,上均压方式、上下均压方式制氧的能耗较低,节能率达30%以上。     

一套有机化工尾气纯化制取高纯氮工艺应用

介绍了一套利用有机物含量复杂的有机化工尾气纯化制氮的清洁新工艺,对试车过程发现的问题进行研究并提出整改建议。装置主要运用了变压吸附、变压吸附真空解吸、催化氧化、催化加氢、化学吸附等技术。     

变压吸附制氮技术及其设备选型

分析了变压吸附制取氮气的原理、工艺流程,比较了变压吸附制氮与其他制氮方法的优点,并且就变压吸附选型的几个关键的技术和装备进行了介绍。     

变压吸附制氮技术的应用

从变压吸附制氮技术原理和沈阳化工公司变压吸附制氮生产的实际情况,分析了变压吸附制氮技术的应用及发展前景。说明了变压吸附制氮技术在化工生产中仍是较适宜的制氮方法。     

Determination of multi-component gas and water equilibrium and non-equilibrium sorption isotherms in carbonaceous solids from early-time measurements

A rapid method is presented for determination of the multi-component gas and water sorption isotherms on carbonaceous solids from the non-equilibrium sorption data. This approach alleviates the long-time data requirement of the traditional volumetric gas adsorption technique used to construct gas isotherms requiring a series of equilibrium sorption measurements by successive pressure increments, particularly resorted in the coalbed methane industry. This is accomplished by the application of the non-equilibrium thermodynamics, multi-component material balance, gas sorption, and dissolution kinetic considerations for the gas adsorbed by carbonaceous solids and the gas dissolved in water under the effect of pressure, temperature, and grain size. The capabilities of the new technique in reducing the time required for construction of an isotherm are demonstrated by analyzing a series of the non-equilibrium sorption measurements and projecting the results to the equilibrium case. Moreover, it is demonstrated that the present model enables constructing both the equilibrium and non-equilibrium multi-component gas and water sorption isotherms in any carbonaceous solids and particularly coals simultaneously in relatively shorter time and with higher accuracy.     

低温吸附法分离氢同位素

液氮温度下用分子筛Y在自行设计的单塔变压吸附装置上进行氢氘气体分离的研究,考察了流量与压力对分离效果的影响,在气体总压力0.40 MPa、总流量129.79 cm3/min与吸附床长度1.0 m时氢氘气体之间的分离因子可达到1.52。然而压力为0.013 9 MPa与0.017 5 MPa时D2与H2在分子筛Y上的平衡吸附量比值仅分别为1.18和1.17。结合平衡吸附和动态分离之间的差异,表明吸附法能够有效分离氢同位素气体的机理是基于动力学效应。     

炭分子筛上氧、氮吸附特性的实验测定

针对BF型炭分子筛孔结构的特点,利用双分散孔结构吸附模型,采用色谱扰动-应答方法,对微孔扩散控制传质机理进行了实验认定,测定了O2的吸附平衡常数K、扩散时间常数Dc/rc2以及O2、N2两组分常温下的吸附等温线.     

相对压强对白炭黑氮吸附表面积测试稳定性的影响

研究相对压强对白炭黑氮吸附表面积测试稳定性的影响。结果表明:在相同液氮纯度、脱气温度、脱气时间、氮吸附点数量条件下,与相对压强范围为0.05~0.1时相比,相对压强范围为0.05~0.2时白炭黑的氮吸附表面积测量值偏低,且差值随氮吸附表面积的增大呈增大趋势;相对压强范围较小时,氮吸附表面积测试结果的线性相关因数较大,再现性较好,测试结果较稳定。     

压力对微型变压吸附制氧的影响

对微型变压吸附制氧系统的吸附器进出口和储气罐内的压力进行了实验研究。通过对压力曲线的分析,可以将无均压流程的吸附循环划分为升压吸附、卸压解吸和反吹清洗3个阶段,将有均压流程的吸附循环划分为均压升压、升压吸附、均压降压、卸压解吸和反吹清洗5个阶段;并对均压步骤、均压时间、反吹阻力等参数对压力曲线的影响进行了分析。     

Investigation of the mechanism for the separation of nitrogen—oxygen mixtures on carbon molecular sieves

Sorption separation of nitrogen-oxygen mixtures by carbon molecular sieves, e.g. to produce nitrogen using the pressure swing adsorption principle, proceeds under the condition of non-equilibrium. Experimental data based upon measurements of sorption equilibria and kinetics for nitrogen and oxygen on several samples of carbon molecular sieve particles in the temperature range 0–50°C suggest the existence of a surface barrier in the pore mouths of slit-like micropores for these particular samples. The conclusion on this phenomenon is supported by the results of canonical and grand canonical Monte Carlo simulations. Both types of analysis give a deeper insight into the complex non-equilibrium separation process.     

变压吸附制氮机组运行总结

变压吸附空分制氮技术以洁净的压缩空气为原料,利用焦炭分子筛吸附其中的氧气成分,从而制得高纯度的氮气。介绍了变压吸附制氮机组的工作原理、影响氮气纯度的因素以及运行状况。     

Dynamic modeling of fixed-bed adsorption of flue gas using a variable mass transfer model

This study introduces a dynamic mass transfer model for the fixed-bed adsorption of a flue gas. The derivation of the variable mass transfer coefficient is based on pore diffusion theory and it is a function of effective porosity, temperature, and pressure as well as the adsorbate composition. Adsorption experiments were done at four different pressures (1.8, 5, 10 and 20 bars) and three different temperatures (30, 50 and 70 °C) with zeolite 13X as the adsorbent. To explain the equilibrium adsorption capacity, the Langmuir-Freundlich isotherm model was adopted, and the parameters of the isotherm equation were fitted to the experimental data for a wide range of pressures and temperatures. Then, dynamic simulations were performed using the system equations for material and energy balance with the equilibrium adsorption isotherm data. The optimal mass transfer and heat transfer coefficients were determined after iterative calculations. As a result, the dynamic variable mass transfer model can estimate the adsorption rate for a wide range of concentrations and precisely simulate the fixed-bed adsorption process of a flue gas mixture of carbon dioxide and nitrogen.     

Air separation by adsorption on molecular sieve 5A

An experimental and theoretical study is given of the separation of oxygen and nitrogen in air by a single column pressure swing adsorption. Adsorption equilibrium and Chromatographic experiments were also carried out to determine the adsorption parameters of the theoretical equation. The theoretical solution applied in this study with the assumption of Freundlich adsorption equilibrium has good agreement with thp experimental results.