多元醇胺对钢铁渣粉溶解特性的影响

为了解决钢铁渣粉溶解性差所引起的活性低的问题,研究了三乙醇胺( TEA)、三异丙醇胺( TIPA)和二乙醇单异丙醇胺( DEIPA)对钢铁渣粉在碱性环境下溶解的影响规律,通过电导率仪、酸度计、电感耦合等离子体原子发射光谱仪( inductively coupled plasma atomic emission spectroscopy,ICP-AES)和八通道微量热仪对钢铁渣粉的溶解特性进行了表征。结果表明：多元醇胺降低了钢铁渣粉液相的pH并提高了液相电导率,主要表现为增加了液相中Fe、Ca、Al元素的质量浓度,其中TEA和DEIPA的影响效果大于TIPA;多元醇胺提高了钢铁渣粉早期的溶解热和最大水化热峰值,进一步证实了多元醇胺对钢铁渣粉具有增溶作用。     

The solubility of methane in aqueous solutions of monoethanolamine,diethanolamine and triethanolamine

The solubility of methane in 3 kmol/m³ solutions of monoethanolamine, diethanolamine, and triethanolamine was measured from 25° to 125°C and pressures up to about 13 MPa. Measurements were also made for the solubility of methane in water at 25° to 125°C and pressures up to 18 MPa in order to confirm the accuracy of the experimental technique. It is demonstrated that methane is more soluble (in terms of mole fraction) in the amine solution than in pure water. Furthermore, the solubility is an increasing function of the size of the alkanolamine. The solubility data were modeled using a Henry's-law approach and the results summarized in terms of salting-in coefficients.     

用灰关联法分析醇胺脱硫溶液的发泡原因

长庆油田天然气净化厂脱除天然气中CO2和H2S过程中,吸收塔内常出现脱硫溶液发泡现象。为了确定发泡原因,运用灰色关联理论,通过均值化处理使相关因子的实验数据无量纲化,分析了各相关因子对40%MDEA 5?A溶液起泡高度的关联度,另外通过实验考察了各个因子对起泡高度的影响。灰色关联分析结果与实验结果一致。逐一讨论了各因子与溶液发泡之间的关系。溶液中总铁浓度代表设备腐蚀程度,对起泡高度的关联度最高(0.7428),总胺浓度倒数代表醇胺降解程度,关联度次高(0.7372),这两个因子是引起脱硫溶液发泡的主要因素,二者相互影响,相互关联,在生产中应加以控制。固体颗粒在高浓度时(>200mg/L)对发泡无影响(关联度0.5376),但影响溶液的其他性能,在生产中应通过加强过滤进行控制。无机盐浓度和溶液粘度的关联度<0.7(分别为0.6621和0.6310),对发泡无影响。图1表2参13。     

基于黏滞球模型的CPA状态方程应用于醇胺系统相平衡的计算

考虑到醇胺及其混合物中分子间存在缔合作用的事实,结合立方型PR状态方程,通过引入基于黏滞球模型(SSM)发展起来的缔合流体的分子热力学模型,建立了一个新的CPA(cubic-plus-association)状态方程,即CPA-SSM,并将方程应用到醇胺系统相平衡的计算中。通过关联对比温度0.55～0.90范围下醇胺流体的实验饱和蒸气压和液相体积得到了8种醇胺流体的分子参数。结果表明,CPA-SSM方程可满意地计算出醇胺饱和蒸气压和液体密度,总平均误差分别只有0.57%和1.80%。对醇胺混合物,无论是恒压还是恒温系统,只需引入一个与温度无关的可调参数,CPA-SSM方程即可满意关联二元系统的汽液平衡数据,并可进一步预测多元混合物的汽液平衡。     

Modeling and Experimental Study of CO2 Removal by Alkanolamines in a Packed Bed

Absorption of CO₂ by monoethanolamine, diethanolamine, and triethanolamine solutions in a lab–scale packed bed tower was investigated. A model for analyzing the heat and mass transfer mechanism in the presence of reaction was developed and validated using the measured data for MEA and TEA solutions and the results were compared with the others' experimental data. The well-known correlations for determining Henry's constant, as a critical parameter in the presented model, were evaluated and it was shown that the available correlations are often limited to a narrow range of operating conditions which could limit the applicability of the available models.     

CO2醇胺富液低能耗再生研究进展

醇胺法吸收CO₂具有效率高、易改造等优点,但较高的再生能耗严重阻碍了其实际应用。本文在介绍醇胺吸收机理和各种醇胺的解吸特性的基础上,分析了采用非水溶剂、固体酸催化剂和纳米颗粒等方法来降低醇胺富液热解吸能耗,以及采用钙基化合物对富液进行化学解吸的原理及可行性。分析表明：再生热负荷与吸收产物密切相关,选择适合的醇胺吸收剂可降低再生反应自由能;非水溶剂在降低显热和汽化热方面效果显著,利用乙醇吸收产物稳定性低的特性,能在降低显热和汽化热的同时降低解吸热;优化固体酸催化剂的中孔比表面积和B酸酸位点或制备新型双功能催化剂能缩短加热时间和降低温度;纳米颗粒通过提高溶液传热传质效率减小再生热负荷,但对醇胺传质传热效果还需进一步研究;采用氯化钙和氢氧化钙等钙基化合物解吸富液成本低、效果好,通过改善粉煤灰等含钙工业废料的均质性和有效成分占比,化学解吸成本有望进一步降低,具有广阔的应用前景。     

脱碳醇胺溶液性能的研究

为了改善CO_2回收工艺的效率和减少再生装置的能源消耗,采用膜吸收接触器和模拟再生器实验研究的方法,对不同操作条件下醇胺溶液吸收CO_2和胺再生的特性进行研究.操作温度在358～403 K范围内变化,再生率从86.2%增长到98.3%.吸收/再生试验中,由于一些热稳定盐的存在导致吸收和再生性能下降.结果表明:与MEA,DEA,DETA和MDEA相比,AMP溶液的吸收和再生效果均良好,是一种很有前途的酸性气体吸收剂.     

有机醇胺溶液吸收选择性脱除H_2S

H2S选择性脱除一直是气体净化领域的热点课题。本文介绍了有机醇胺溶液选择性脱除H2S的溶剂,反应机理和传质动力学。总结了醇胺溶剂选择性脱除H2S的最近的研究进展。     

Modeling and Simulation for Post-Combustion Carbon Dioxide Capture from Power Plant Flue Gas with Economic Analysis

In this study three configurations, viz. conventional MEA, interstage absorber, and interstage absorber with two stripper configuration have been techno-economically evaluated for the optimized result by carrying out simulations using ASPEN PLUS. An economic model defined for carbon capture using 30 wt% MEA to reduce CO₂ in flue gas to 0.5 mol% of 550 MWe coal fired power plant resulted in increase in COE of power plant by 20.6, 17.4, and 15.6 percents for the three configurations, respectively. The CO₂-avoided cost for the three configurations are 65.94, 64.05, and 63.09 ($ /tonne of CO₂ avoided), respectively.     

链烷醇胺对水泥长期储存性能及粉体性能的影响

模拟水泥存放环境,研究了链烷醇胺类助磨剂对存放60d后水泥力学性能及粉体性能(如颗粒形貌和休止角)的影响。结果表明,水泥长期储存后抗压强度降低,而掺入链烷醇胺类助磨剂的水泥的强度降低幅度更大;长期储存后水泥颗粒表面出现了明显的凝胶状物质,休止角也明显增大。