低浓度煤层气变压吸附浓缩试验研究

为研究自制碳分子筛对低浓度煤层气的浓缩性能,分别使用自制碳分子筛及活性炭为吸附剂、采用变压吸附对CH_4浓度为25%的低浓度煤层气进行提浓,考察了吸附压力、吸附时间等工艺参数对提浓效果的影响,对碳分子筛和活性炭吸附剂的提浓效果进行了比较。结果表明:随吸附压力的提高,提浓效果存在峰值,较优的吸附压力为200 k Pa;吸附时间增加,提浓效果先快速提高,吸附时间继续增加提浓效果缓慢下降,最佳吸附时间为120 s。自制碳分子筛吸附剂具有浓缩效果好、产品气浓度稳定的优势。     

真空变压吸附捕集烟道气中二氧化碳的模拟、实验及分析

采用工业硅胶作为吸附剂,利用两塔变压吸附装置进行了烟道气变压吸附碳捕集实验。利用gPROMS软件建立两塔变压吸附模型对实验过程进行模拟,对比了实验和模拟的结果,验证了模型的准确性。通过两塔变压吸附可将15%的CO₂富集到74%,收率为91.52%。在模型基础上考察了变压吸附碳捕集过程中进料量、吸附时间、顺放压力与二氧化碳收率、纯度和能耗的关系,定性分析了吸附塔压力和进料量对压缩机能耗的影响。结果表明:增大进料量、延长吸附时间、降低顺放压力,可以有效提高产品气中CO₂浓度,但同时也导致收率的下降,前两者还会造成单位能耗的增加;吸附压力越高,进料流量越大,压缩机能耗越大。     

低浓度煤层气变压吸附制甲烷研究进展

从吸附剂改进及工艺优化模拟2个角度,对近几年低浓度煤层气变压吸附制甲烷的研究情况进行了综述。归纳总结了上述2个角度的相同点与不同点,指出今后复合材料吸附剂的原料选取及原料最适宜配比仍会是吸附剂改进的热点;工艺优化模拟大多在强调产能提高,过程的安全保障提及较少。在吸附剂改进及工艺优化模拟时,工业智能化都对煤炭资源的制备与利用起到了一定积极影响。     

变压吸附应用于糖厂锅炉烟道气CO_2提纯的研究

对变压吸附系统将糖厂锅炉烟道气低浓度CO2提纯并应用于亚硫酸法澄清工艺进行阐述和分析。把系统浓缩的CO2送至蔗糖澄清工段进行饱充,可减少糖浆澄清的硫、磷用量,降低糖品杂质含量、提高糖品质量,减轻环境污染。     

变压吸附提纯二氧化碳技术应用

中石油兰州石化公司化肥厂由于原料的改变,二氧化碳回收率无法满足氨碳平衡,对合成氨装置低温甲醇洗单元进行了改造,利用变压吸附技术回收甲醇洗单元脱碳塔五段汽提废气中的二氧化碳,保证化肥装置的氨碳平衡.     

变压吸附提纯二氧化碳技术应用

目前许多化肥厂因为原料的改变,使得二氧化碳的回收率不能满足氨碳的平衡。如何实现变压吸附技术的应用是时下人们关心的焦点。本文即围绕这一问题展开,重点阐述了怎样应用变压吸附法提纯技术来提高二氧化碳的回收率,变压吸附法提纯二氧化碳技术的应用,以及应用此项技术产生的经济效益和社会效益等相关问题。     

低浓度瓦斯真空变压吸附提浓示范项目研究

该示范工程采用了真空变压吸附(VPSA)方案对煤矿低浓度瓦斯气进行提浓,将甲烷含量13%左右的瓦斯气提浓到35%左右。实现了真空变压吸附工艺在低浓度瓦斯气提纯方面的工业化应用,成功探索了在甲烷爆炸极限范围内低浓度瓦斯气的安全利用问题,开辟了低浓度瓦斯安全利用的新途径和新工艺。该示范工程是目前国内规模最大的真空变压吸附瓦斯提浓装置,避免了瓦斯资源浪费,减少了温室气体排放,有良好的经济效益和环境效益,具有一定的示范性。     

变压吸附分离工业废气二氧化碳的研究进展

概述了未来人类对过量二氧化碳排放的处理办法,即碳的捕获和存储(CCS).简介了4种二氧化碳的分离工艺及特点和工业中二氧化碳的捕获系统.阐述了变压吸附工艺的基本原理和其在捕获工业废气中二氧化碳上的应用,以及变压吸附分离二氧化碳的工艺在循环结构设计、吸附剂材料和数值模拟等方面的研究进展和国内外的工业化应用.分析了目前该工艺仍存在的问题,指出该技术具有广阔的应用前景.     

变压吸附法脱除变换气中二氧化碳的技术总结

简要介绍变压吸附(PSA)法脱除变换气中二氧化碳装置的工艺流程及运行情况,提出在生产运行中需要注意的问题,并对几种脱除变换气中二氧化碳的工艺进行经济分析比较。     

真空变压吸附法在煤矿低浓度瓦斯提浓回收中的应用与研究

根据真空变压吸附法原理,研究原料气的甲烷浓度低于12%时,通过6个真空变压吸附塔,使用了高效低压的甲烷专用AS吸附剂和HX-CH4吸附剂,可使产品气的甲烷浓度一步就达到30%以上。同时吸附塔内采用了多层复杂的静电消除设施,以使带电面积不大于25cm2,确保安全。     

Design and experiment of high-productivity two-stage vacuum pressure swing adsorption process for carbon capturing from dry flue gas

A two-stage vacuum pressure swing adsorption (VPSA) process that coupled kinetically controlled and equilibrium controlled separation process with reflux has been investigated for capturing carbon dioxide from dry flue gas (85% N₂/15% CO₂). In the first enriching stage, carbon molecular sieve (CMS), which shows kinetic selectivity for CO₂/N₂, is adopted as the adsorbent to remove most N₂ in feed gas, thereby upgrading CO₂ and significantly reducing the amount for further refinement. The second stage loads zeolite 13X as adsorbent to purify the CO₂-rich flow from the first stage for meeting the requirements of National Energy Technology Laboratory. Series of experiments have been conducted for adsorption isotherms measuring and lab-scale experimental validation as well as analysis. The effect of feed composition on the separation performance of the PSA system was studied experimentally and theoretically here. The optimal results achieved 95.1% purity and 92.9% recovery with a high CO₂ productivity (1.89 mol CO₂·h^-1·kg^-1) and an appropriate energy consumption of 1.07 MJ·(kg CO₂)^-1. Further analysis has been carried out by simulation for explicating the temperature, pressure, and concentration distribution at cyclic steady state.     

AMP-MEA-DETA三元体系吸收烟气CO_2实验研究

采用搅拌实验装置,研究AMP-MEA-DETA复合溶液对烟道气中二氧化碳的吸收和解吸性能,揭示了吸收速率、吸收容量与酸碱度、时间之间的内在联系,并对CO2初始逸出温度、试液再生温度、试液再生率进行了细致记录分析。结果表明,AMP-MEA-DETA三组分之间存在负相互作用;其吸收速率、吸收量大于AMP-MEA复合溶液、DETA单组份的吸收速率及吸收容量,小于两者之和;AMP-MEA-DETA三组分的再生温度为103℃左右,再生率为86.5%左右。     

AMP-MEA—DETA三元体系吸收烟气CO2实验研究

采用搅拌实验装置,研究AMP-MEA-DETA复合溶液对烟道气中二氧化碳的吸收和解吸性能,揭示了吸收速率、吸收容量与酸碱度、时间之间的内在联系,并对CO2初始逸出温度、试液再生温度、试液再生率进行了细致记录分析。结果表明,AMP—MEA-DETA三组分之间存在负相互作用;其吸收速率、吸收量大于AMP-MEA复合溶液、DETA单组份的吸收速率及吸收容量,小于两者之和;AMP—MEA-DETA三组分的再生温度为103℃左右,再生率为86．5％左右。     

烟道气中二氧化碳回收技术的研究

介绍了一乙醇胺(MEA)法回收烟道气中二氧化碳的基本原理和工艺流程,指出MEA法具有蒸汽消耗量高、溶液腐蚀性强、MEA易与氧气发生降解反应等缺点。开发了一种从烟道气中回收二氧化碳的新技术,采用的吸收剂是在MEA水溶液中添加了活性胺、抗氧剂和防腐剂的复合溶液。将新技术应用于赤天化集团有限公司烟道气中二氧化碳的回收装置上,试验结果表明,二氧化碳年平均产量提高了25.8%,1m3二氧化碳的蒸汽消耗量可减少3.23kg,并可解决MEA对设备的腐蚀问题。     

烟道气二氧化碳分离回收技术进展

介绍了物理法、化学法、生物法回收二氧化碳的现有技术,指出了适用范围,并对烟气二氧化碳回收技术进行了展望。物理性回收二氧化碳技术可分为溶剂吸收法、物理吸附法两类;化学性回收二氧化碳技术可分为化学固定技术、化学吸收法、化学吸附法、薄膜分离法和二氧化碳重组法;生物性回收二氧化碳技术可分为微生物回收技术和球石藻回收技术。其中以薄膜分离法最具应用前景。     

环丁砜-二异丙醇胺复合溶液吸收烟气中CO_2实验研究

采用搅拌实验装置,研究环丁砜溶液及不同配比的环丁砜-D IPA复合溶液对烟道气中二氧化碳的吸收和解吸性能,揭示了吸收容量与酸碱度、时间之间的内在联系,并对CO2初始逸出温度、试液再生温度、试液再生率、再生pH下降率进行了细致记录分析。实验结果表明,环丁砜-D IPA复合溶液配比为0.4∶0.6时,吸收效果最佳,吸收量约为0.08 mol,再生温度最低为102.5℃,再生率最高为91.64%。实验结果还表明,环丁砜-D IPA复合体系之间存在弱的正交互作用。     

High purity CO gas separation by pressure swing adsorption

A pressure swing adsorption (PSA) process with a single stage for recovering high purity CO was developed with an original chemical adsorbent that adsorbs CO selectively. A pilot test was made to optimize the process and confirm the stability of the adsorbent. A first commercial plant was constructed at the Kakogawa Works of Kobe Steel in March 1989. Subsequently, a second commercial plant was constructed at the Kobe Works of Kobe Steel in October 1990. The two plants have been producing high purity CO stably and consistently.     

Vacuum pressure swing adsorption process for coalbed methane enrichment

The enrichment of low concentration coalbed methane using adsorption process with activated carbon adsorbent was studied in this work.Adsorption isotherms of methane,nitrogen and carbon dioxide on activated carbon were measured by volumetric method,meanwhile a series of breakthrough tests with single component,binary components and three components feed mixture has been performed for exploring dynamic adsorption behaviors.Moreover,a rigorous mathematical model of adsorption bed containing mass,energy,and momentum conservation equation as well as dual-site Langmuir model with the Linear driving force model for gas-solid phase mass transfer has been proposed for numerical modeling and simulation of fixed bed breakthrough process and vacuum pressure swing adsorption process.Furthermore,the lumped mass transfer coefficient of methane,nitrogen and carbon dioxide on activated carbon adsorbent has been determined to be 0.3 s~(-1),1.0 s~(-1) and 0.06 s~(-1) by fitting the breakthrough curves using numerical calculation.Additionally,a six bed VPSA process with twelve step cycle sequence has been proposed and investigated for low concentration coalbed methane enrichment.Results demonstrated that the methane molar fraction in feed mixture ranged from 10% to 50% could be enriched to 32.15% to 88.75% methane in heavy product gas with a methane recovery higher than 83%under the adsorption pressure of 3 bar(1 bar=10~5 Pa) and desorption pressure of 0.1 bar.Energy consumption of this VPSA process was varied from 0.165 kW·h·m~(-3) CH_4 to 0.649 kW·h·m~(-3) CH_4.Finally,a dual-stage VPSA process has been successfully developed to upgrade a low concentration coalbed methane containing 20% methane to a target product gas with methane purity higher than 90%,meanwhile the total methane recovery was up to 98.71% with a total energy consumption of 0.504 kW·h·m~(-3) CH_4.     

环丁砜-二异丙醇胺复合溶液吸收烟气中CO2实验研究

采用搅拌实验装置,研究环丁砜溶液及不同配比的环丁砜-DIPA复合溶液对烟道气中二氧化碳的吸收和解吸性能,揭示了吸收容量与酸碱度、时间之间的内在联系,并对CO2初始逸出温度、试液再生温度、试液再生率、再生pH下降率进行了细致记录分析.实验结果表明,环丁砜-DIPA复合溶液配比为0.4∶0.6时,吸收效果最佳,吸收量约为0.08 mol,再生温度最低为102.5℃,再生率最高为91.64%.实验结果还表明,环丁砜-DIPA复合体系之间存在弱的正交互作用.