改良MDEA脱碳存在问题的探讨与对策

介绍MDEA脱碳在我公司生产过程中出现的问题 ,并提出了相应的解决方案     

非水MDEA混合溶剂对H_2S的选择性脱除

以小型绝热填料吸收和再生塔组合成实验室模拟脱硫装置,综合评价了添加部分有机溶剂时脱硫剂对脱硫效率及选择性因子的影响.以30%(wt)MDEA水溶液为基准,实验筛选了N—甲基吡咯烷酮(NMP)、乙二醇(EG)等9种有机添加溶剂.综合评价可得,以添加合适的有机溶剂替代大部分水而组成的MDEA非水溶剂具有比MDEA水溶液更高的脱硫选择性,但其脱硫效率略低.     

胺法在脱碳工艺中的应用

主要介绍了MDEA及空间位阻胺这两种高效，低耗的脱碳合成氨原料气和天然气脱碳工艺中的应用情况。     

Optimization of Improvable Flows by combining BAT Analysis and process simulation

This paper proposes a methodology to improve the sustainability of industrial processes combining two tools: BAT Analysis and process simulation. Both tools are jointly applied to identify the IF of the analyzed process, so that the most appropriate candidate techniques from an inventory can be selected. The selected alternatives are tested in different scenarios that are evaluated using simulation, which would determine the configuration that best improves the sustainability of the process. The combination of both tools in an integrated methodology will help decision makers to select the most sustainable configuration for a given process. The methodology is validated in a case study: a hydrogen production plant. After analysing several scenarios where different candidate techniques are implemented, results show that the IF identified can be highly improved when the appropriate combination of BAT is applied.     

胺液中N-甲基二乙醇胺含量的测定

由于天然气净化厂脱硫胺液中含有甘醇类降解产物,二甘醇（DEG）和三甘醇（TEG）难于准确称量,以DEG或TEG为内标物的毛细管气相色谱法测定胺液中MDEA的含量时,会产生较大的误差。为避免这种影响,建立了以甲苯为内标物的毛细管气相色谱测定法：选用美国Agilent HP-50+毛细管柱来分析胺液中甲基二乙醇胺（MDE）的含量;定量方法为内标法;对三甘醇（TEG）和甲苯进行分析对比,最终选用甲苯作为内标物;使用MINITAB 15.1处理实验数据。实验结果表明：MDEA和甲苯出峰稳定,重复性好;方法回收率为99%~101%,相对标准偏差<2%。该法精密度和准确度较高,不仅可用于天然气净化厂胺液中MDEA含量的测定,而且对同类胺液的MDEA含量测定研究也有一定的借鉴作用。     

旋转床应用于干气脱硫装置的试验研究

旋转床是一种新型高效气液传质设备,具有传质效率高、停留时间短等优点,本文主要阐述了采用旋转床反应器应用于干气脱硫装置的试验情况。试验结果表明,在相同的操作条件下,采用旋转床反应器代替吸收塔,能够在保证H2S脱除率的前提下,有效地降低了CO2共吸率。     

Piperazine and methyldiethanolamine interrelationships in CO2 absorption by aqueous amine mixtures. Part II—Saturation rates of mixed reagent solutions

This work is a companion to a previous article, Part I, published in The Canadian Journal of Chemical Engineering, dealing with CO₂ absorption in aqueous solutions containing a single aminic reagent (specifically methyldiethanolamine (MDEA) or piperazine (PZ)). In this second part, different PZ/MDEA mixtures are experimentally studied and their performances are compared with that of the single reagents. It is indeed well known that small quantities of PZ added to MDEA aqueous solutions are sufficient to obtain a significant improvement in the kinetics of the process. PZ is considered an activator or promoter for MDEA, but the mechanism of this synergy has still not been clearly demonstrated. The aim of this study is an attempt to understand how PZ and MDEA can interact by experimentally analyzing this beneficial mutual effect and by explaining it with the help of a suitable yet not complex model. We believe that the involved chemistry is not more complex than that reported in Part I for the single reagents. According to our findings, it is MDEA that enhances the action of PZ, as opposed to what many authors claim. Moreover, our results seem to rule out the existence of any PZ shuttle effect.     

脱碳系统解吸塔液泛原因分析及对策

针对中国石油乌鲁木齐石化公司化肥厂脱碳系统多次出现液泛的问题。进行了调查,分析提出一系列改进措施,实施后效果良好。     

燃烧前CO2捕集技术在IGCC发电中的应用

由于整体煤气化联合循环（IGCC）发电本身的技术特点,使得其非常适合于进行燃烧前CO₂捕集。针对IGCC特点,提出了一种MDEA脱酸气结合湿法氧化法硫回收的燃烧前CO₂捕集流程。通过模拟计算,验证了流程的可行性。将其与IGCC发电系统集成,对比计算了有无燃烧前CO₂捕集的IGCC系统供电效率等相关参数,燃烧前CO₂捕集使IGCC供电效率降低约10个百分点。分析指出了导致包含燃烧前CO₂捕集的IGCC供电效率降低的3个因素：蒸汽消耗、燃料化学能损失和新增动力设备电耗,并据此确定了今后的优化方向。     

改性硅胶吸附分离N2/CO2的研究

目前,人类在能源系统中产生大量CO2并直接排放,导致了大气温室效应和地球变暖。因此从环境保护和节约能源角度考虑,对排放的N2/CO2混合气进行回收和利用是非常必要的。选择高沸点的N-甲基二乙醇胺（MDEA）作为涂渍液,用不同浓度的涂渍液对粗孔微球硅胶进行预处理,并分别进行了N2/CO2混合气的穿透实验研究,实验结果表明：以粗孔微球硅胶为担体涂渍35%MDEA的吸附剂,在操作压力为0.4MPa时,对N2/CO2混合气分离效果最好。